diff --git a/build/d3-dot-graph.js b/build/d3-dot-graph.js
new file mode 100644
index 0000000..8323e49
--- /dev/null
+++ b/build/d3-dot-graph.js
@@ -0,0 +1,2491 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(factory());
+}(this, (function () { 'use strict';
+
+/*
+ * Generated by PEG.js 0.10.0.
+ *
+ * http://pegjs.org/
+ */
+(function(root) {
+  "use strict";
+
+  function peg$subclass(child, parent) {
+    function ctor() { this.constructor = child; }
+    ctor.prototype = parent.prototype;
+    child.prototype = new ctor();
+  }
+
+  function peg$SyntaxError(message, expected, found, location) {
+    this.message  = message;
+    this.expected = expected;
+    this.found    = found;
+    this.location = location;
+    this.name     = "SyntaxError";
+
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, peg$SyntaxError);
+    }
+  }
+
+  peg$subclass(peg$SyntaxError, Error);
+
+  peg$SyntaxError.buildMessage = function(expected, found) {
+    var DESCRIBE_EXPECTATION_FNS = {
+          literal: function(expectation) {
+            return "\"" + literalEscape(expectation.text) + "\"";
+          },
+
+          "class": function(expectation) {
+            var escapedParts = "",
+                i;
+
+            for (i = 0; i < expectation.parts.length; i++) {
+              escapedParts += expectation.parts[i] instanceof Array
+                ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1])
+                : classEscape(expectation.parts[i]);
+            }
+
+            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+          },
+
+          any: function(expectation) {
+            return "any character";
+          },
+
+          end: function(expectation) {
+            return "end of input";
+          },
+
+          other: function(expectation) {
+            return expectation.description;
+          }
+        };
+
+    function hex(ch) {
+      return ch.charCodeAt(0).toString(16).toUpperCase();
+    }
+
+    function literalEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/"/g,  '\\"')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function classEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/\]/g, '\\]')
+        .replace(/\^/g, '\\^')
+        .replace(/-/g,  '\\-')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function describeExpectation(expectation) {
+      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+    }
+
+    function describeExpected(expected) {
+      var descriptions = new Array(expected.length),
+          i, j;
+
+      for (i = 0; i < expected.length; i++) {
+        descriptions[i] = describeExpectation(expected[i]);
+      }
+
+      descriptions.sort();
+
+      if (descriptions.length > 0) {
+        for (i = 1, j = 1; i < descriptions.length; i++) {
+          if (descriptions[i - 1] !== descriptions[i]) {
+            descriptions[j] = descriptions[i];
+            j++;
+          }
+        }
+        descriptions.length = j;
+      }
+
+      switch (descriptions.length) {
+        case 1:
+          return descriptions[0];
+
+        case 2:
+          return descriptions[0] + " or " + descriptions[1];
+
+        default:
+          return descriptions.slice(0, -1).join(", ")
+            + ", or "
+            + descriptions[descriptions.length - 1];
+      }
+    }
+
+    function describeFound(found) {
+      return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+    }
+
+    return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+  };
+
+  function peg$parse(input, options) {
+    options = options !== void 0 ? options : {};
+
+    var peg$FAILED = {},
+
+        peg$startRuleFunctions = { start: peg$parsestart },
+        peg$startRuleFunction  = peg$parsestart,
+
+        peg$c0 = "{",
+        peg$c1 = peg$literalExpectation("{", false),
+        peg$c2 = "}",
+        peg$c3 = peg$literalExpectation("}", false),
+        peg$c4 = function(strict, type, id, stmts) {
+              return {type: type, id: id, strict: strict !== null, stmts: stmts};
+            },
+        peg$c5 = ";",
+        peg$c6 = peg$literalExpectation(";", false),
+        peg$c7 = function(first, rest) {
+              var result = [first];
+              for (var i = 0; i < rest.length; ++i) {
+                result.push(rest[i][1]);
+              }
+              return result;
+            },
+        peg$c8 = function(type, attrs) {
+              return { type: "attr", attrType: type, attrs: attrs || {}};
+            },
+        peg$c9 = "=",
+        peg$c10 = peg$literalExpectation("=", false),
+        peg$c11 = function(k, v) {
+              var attrs = {};
+              attrs[k] = v;
+              return { type: "inlineAttr", attrs: attrs };
+            },
+        peg$c12 = function(id, attrs) { return {type: "node", id: id, attrs: attrs || {}}; },
+        peg$c13 = function(lhs, rhs, attrs) {
+              var elems = [lhs];
+              for (var i = 0; i < rhs.length; ++i) {
+                elems.push(rhs[i]);
+              }
+              return { type: "edge", elems: elems, attrs: attrs || {} };
+            },
+        peg$c14 = function(id, stmts) {
+              id = (id && id[2]) || [];
+              return { type: "subgraph", id: id[0], stmts: stmts };
+            },
+        peg$c15 = function(first, rest) {
+              var result = first;
+              for (var i = 0; i < rest.length; ++i) {
+                merge(result, rest[i][1]);
+              }
+              return result;
+            },
+        peg$c16 = "[",
+        peg$c17 = peg$literalExpectation("[", false),
+        peg$c18 = "]",
+        peg$c19 = peg$literalExpectation("]", false),
+        peg$c20 = function(aList) { return aList; },
+        peg$c21 = ",",
+        peg$c22 = peg$literalExpectation(",", false),
+        peg$c23 = function(first, rest) {
+              var result = first;
+              for (var i = 0; i < rest.length; ++i) {
+                _.merge(result, rest[i][3]);
+              }
+              return result;
+            },
+        peg$c24 = "--",
+        peg$c25 = peg$literalExpectation("--", false),
+        peg$c26 = function() { return directed; },
+        peg$c27 = "->",
+        peg$c28 = peg$literalExpectation("->", false),
+        peg$c29 = function(rhs, rest) {
+              var result = [rhs];
+              if (rest) {
+                for (var i = 0; i < rest.length; ++i) {
+                  result.push(rest[i]);
+                }
+              }
+              return result;
+            },
+        peg$c30 = function(k, v) {
+              var result = {};
+              result[k] = v[3];
+              return result;
+            },
+        peg$c31 = function(id) { return { type: "node", id: id, attrs: {} }; },
+        peg$c32 = function(id) { return id; },
+        peg$c33 = ":",
+        peg$c34 = peg$literalExpectation(":", false),
+        peg$c35 = "ne",
+        peg$c36 = peg$literalExpectation("ne", false),
+        peg$c37 = "se",
+        peg$c38 = peg$literalExpectation("se", false),
+        peg$c39 = "sw",
+        peg$c40 = peg$literalExpectation("sw", false),
+        peg$c41 = "nw",
+        peg$c42 = peg$literalExpectation("nw", false),
+        peg$c43 = "n",
+        peg$c44 = peg$literalExpectation("n", false),
+        peg$c45 = "e",
+        peg$c46 = peg$literalExpectation("e", false),
+        peg$c47 = "s",
+        peg$c48 = peg$literalExpectation("s", false),
+        peg$c49 = "w",
+        peg$c50 = peg$literalExpectation("w", false),
+        peg$c51 = "c",
+        peg$c52 = peg$literalExpectation("c", false),
+        peg$c53 = "_",
+        peg$c54 = peg$literalExpectation("_", false),
+        peg$c55 = peg$otherExpectation("identifier"),
+        peg$c56 = /^[a-zA-Z\u0200-\u0377_]/,
+        peg$c57 = peg$classExpectation([["a", "z"], ["A", "Z"], ["\u0200", "\u0377"], "_"], false, false),
+        peg$c58 = /^[a-zA-Z\u0200-\u0377_0-9]/,
+        peg$c59 = peg$classExpectation([["a", "z"], ["A", "Z"], ["\u0200", "\u0377"], "_", ["0", "9"]], false, false),
+        peg$c60 = function(fst, rest) { return fst + rest.join(""); },
+        peg$c61 = "-",
+        peg$c62 = peg$literalExpectation("-", false),
+        peg$c63 = ".",
+        peg$c64 = peg$literalExpectation(".", false),
+        peg$c65 = /^[0-9]/,
+        peg$c66 = peg$classExpectation([["0", "9"]], false, false),
+        peg$c67 = function(sign, dot, after) {
+              return (sign || "") + dot + after.join("");
+            },
+        peg$c68 = function(sign, before, after) {
+              return (sign || "") + before.join("") + (after ? after[0] : "") + (after ? after[1].join("") : "");
+            },
+        peg$c69 = "\"",
+        peg$c70 = peg$literalExpectation("\"", false),
+        peg$c71 = "\\\"",
+        peg$c72 = peg$literalExpectation("\\\"", false),
+        peg$c73 = function() { return '"'; },
+        peg$c74 = "\\",
+        peg$c75 = peg$literalExpectation("\\", false),
+        peg$c76 = /^[^"]/,
+        peg$c77 = peg$classExpectation(["\""], true, false),
+        peg$c78 = function(ch) { return "\\" + ch; },
+        peg$c79 = function(id) {
+              return id.join("");
+            },
+        peg$c80 = "node",
+        peg$c81 = peg$literalExpectation("node", true),
+        peg$c82 = function(k) { return k.toLowerCase(); },
+        peg$c83 = "edge",
+        peg$c84 = peg$literalExpectation("edge", true),
+        peg$c85 = "graph",
+        peg$c86 = peg$literalExpectation("graph", true),
+        peg$c87 = "digraph",
+        peg$c88 = peg$literalExpectation("digraph", true),
+        peg$c89 = "subgraph",
+        peg$c90 = peg$literalExpectation("subgraph", true),
+        peg$c91 = "strict",
+        peg$c92 = peg$literalExpectation("strict", true),
+        peg$c93 = function(graph) {
+              directed = graph === "digraph";
+              return graph;
+            },
+        peg$c94 = peg$otherExpectation("whitespace"),
+        peg$c95 = /^[ \t\r\n]/,
+        peg$c96 = peg$classExpectation([" ", "\t", "\r", "\n"], false, false),
+        peg$c97 = peg$otherExpectation("comment"),
+        peg$c98 = "//",
+        peg$c99 = peg$literalExpectation("//", false),
+        peg$c100 = /^[^\n]/,
+        peg$c101 = peg$classExpectation(["\n"], true, false),
+        peg$c102 = "/*",
+        peg$c103 = peg$literalExpectation("/*", false),
+        peg$c104 = "*/",
+        peg$c105 = peg$literalExpectation("*/", false),
+        peg$c106 = peg$anyExpectation(),
+
+        peg$currPos          = 0,
+        peg$savedPos         = 0,
+        peg$posDetailsCache  = [{ line: 1, column: 1 }],
+        peg$maxFailPos       = 0,
+        peg$maxFailExpected  = [],
+        peg$silentFails      = 0,
+
+        peg$result;
+
+    if ("startRule" in options) {
+      if (!(options.startRule in peg$startRuleFunctions)) {
+        throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+      }
+
+      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+    }
+
+    function peg$literalExpectation(text, ignoreCase) {
+      return { type: "literal", text: text, ignoreCase: ignoreCase };
+    }
+
+    function peg$classExpectation(parts, inverted, ignoreCase) {
+      return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+    }
+
+    function peg$anyExpectation() {
+      return { type: "any" };
+    }
+
+    function peg$endExpectation() {
+      return { type: "end" };
+    }
+
+    function peg$otherExpectation(description) {
+      return { type: "other", description: description };
+    }
+
+    function peg$computePosDetails(pos) {
+      var details = peg$posDetailsCache[pos], p;
+
+      if (details) {
+        return details;
+      } else {
+        p = pos - 1;
+        while (!peg$posDetailsCache[p]) {
+          p--;
+        }
+
+        details = peg$posDetailsCache[p];
+        details = {
+          line:   details.line,
+          column: details.column
+        };
+
+        while (p < pos) {
+          if (input.charCodeAt(p) === 10) {
+            details.line++;
+            details.column = 1;
+          } else {
+            details.column++;
+          }
+
+          p++;
+        }
+
+        peg$posDetailsCache[pos] = details;
+        return details;
+      }
+    }
+
+    function peg$computeLocation(startPos, endPos) {
+      var startPosDetails = peg$computePosDetails(startPos),
+          endPosDetails   = peg$computePosDetails(endPos);
+
+      return {
+        start: {
+          offset: startPos,
+          line:   startPosDetails.line,
+          column: startPosDetails.column
+        },
+        end: {
+          offset: endPos,
+          line:   endPosDetails.line,
+          column: endPosDetails.column
+        }
+      };
+    }
+
+    function peg$fail(expected) {
+      if (peg$currPos < peg$maxFailPos) { return; }
+
+      if (peg$currPos > peg$maxFailPos) {
+        peg$maxFailPos = peg$currPos;
+        peg$maxFailExpected = [];
+      }
+
+      peg$maxFailExpected.push(expected);
+    }
+
+    function peg$buildStructuredError(expected, found, location) {
+      return new peg$SyntaxError(
+        peg$SyntaxError.buildMessage(expected, found),
+        expected,
+        found,
+        location
+      );
+    }
+
+    function peg$parsestart() {
+      var s0, s1;
+
+      s0 = [];
+      s1 = peg$parsegraphStmt();
+      if (s1 !== peg$FAILED) {
+        while (s1 !== peg$FAILED) {
+          s0.push(s1);
+          s1 = peg$parsegraphStmt();
+        }
+      } else {
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsegraphStmt() {
+      var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13;
+
+      s0 = peg$currPos;
+      s1 = [];
+      s2 = peg$parse_();
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parse_();
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$currPos;
+        s3 = peg$parsestrict();
+        if (s3 !== peg$FAILED) {
+          s4 = peg$parse_();
+          if (s4 !== peg$FAILED) {
+            s3 = [s3, s4];
+            s2 = s3;
+          } else {
+            peg$currPos = s2;
+            s2 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s2;
+          s2 = peg$FAILED;
+        }
+        if (s2 === peg$FAILED) {
+          s2 = null;
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parsegraphType();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseid();
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = [];
+                s7 = peg$parse_();
+                while (s7 !== peg$FAILED) {
+                  s6.push(s7);
+                  s7 = peg$parse_();
+                }
+                if (s6 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 123) {
+                    s7 = peg$c0;
+                    peg$currPos++;
+                  } else {
+                    s7 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c1); }
+                  }
+                  if (s7 !== peg$FAILED) {
+                    s8 = [];
+                    s9 = peg$parse_();
+                    while (s9 !== peg$FAILED) {
+                      s8.push(s9);
+                      s9 = peg$parse_();
+                    }
+                    if (s8 !== peg$FAILED) {
+                      s9 = peg$parsestmtList();
+                      if (s9 === peg$FAILED) {
+                        s9 = null;
+                      }
+                      if (s9 !== peg$FAILED) {
+                        s10 = [];
+                        s11 = peg$parse_();
+                        while (s11 !== peg$FAILED) {
+                          s10.push(s11);
+                          s11 = peg$parse_();
+                        }
+                        if (s10 !== peg$FAILED) {
+                          if (input.charCodeAt(peg$currPos) === 125) {
+                            s11 = peg$c2;
+                            peg$currPos++;
+                          } else {
+                            s11 = peg$FAILED;
+                            if (peg$silentFails === 0) { peg$fail(peg$c3); }
+                          }
+                          if (s11 !== peg$FAILED) {
+                            s12 = [];
+                            s13 = peg$parse_();
+                            while (s13 !== peg$FAILED) {
+                              s12.push(s13);
+                              s13 = peg$parse_();
+                            }
+                            if (s12 !== peg$FAILED) {
+                              s1 = peg$c4(s2, s3, s5, s9);
+                              s0 = s1;
+                            } else {
+                              peg$currPos = s0;
+                              s0 = peg$FAILED;
+                            }
+                          } else {
+                            peg$currPos = s0;
+                            s0 = peg$FAILED;
+                          }
+                        } else {
+                          peg$currPos = s0;
+                          s0 = peg$FAILED;
+                        }
+                      } else {
+                        peg$currPos = s0;
+                        s0 = peg$FAILED;
+                      }
+                    } else {
+                      peg$currPos = s0;
+                      s0 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsestmtList() {
+      var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+      s0 = peg$currPos;
+      s1 = peg$parsestmt();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 59) {
+            s3 = peg$c5;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c6); }
+          }
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$currPos;
+            s6 = [];
+            s7 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
+            }
+            if (s6 !== peg$FAILED) {
+              s7 = peg$parsestmt();
+              if (s7 !== peg$FAILED) {
+                s8 = [];
+                s9 = peg$parse_();
+                while (s9 !== peg$FAILED) {
+                  s8.push(s9);
+                  s9 = peg$parse_();
+                }
+                if (s8 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 59) {
+                    s9 = peg$c5;
+                    peg$currPos++;
+                  } else {
+                    s9 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c6); }
+                  }
+                  if (s9 === peg$FAILED) {
+                    s9 = null;
+                  }
+                  if (s9 !== peg$FAILED) {
+                    s6 = [s6, s7, s8, s9];
+                    s5 = s6;
+                  } else {
+                    peg$currPos = s5;
+                    s5 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s5;
+              s5 = peg$FAILED;
+            }
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$currPos;
+              s6 = [];
+              s7 = peg$parse_();
+              while (s7 !== peg$FAILED) {
+                s6.push(s7);
+                s7 = peg$parse_();
+              }
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parsestmt();
+                if (s7 !== peg$FAILED) {
+                  s8 = [];
+                  s9 = peg$parse_();
+                  while (s9 !== peg$FAILED) {
+                    s8.push(s9);
+                    s9 = peg$parse_();
+                  }
+                  if (s8 !== peg$FAILED) {
+                    if (input.charCodeAt(peg$currPos) === 59) {
+                      s9 = peg$c5;
+                      peg$currPos++;
+                    } else {
+                      s9 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c6); }
+                    }
+                    if (s9 === peg$FAILED) {
+                      s9 = null;
+                    }
+                    if (s9 !== peg$FAILED) {
+                      s6 = [s6, s7, s8, s9];
+                      s5 = s6;
+                    } else {
+                      peg$currPos = s5;
+                      s5 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s5;
+                    s5 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              s1 = peg$c7(s1, s4);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsestmt() {
+      var s0;
+
+      s0 = peg$parseattrStmt();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseedgeStmt();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parsesubgraphStmt();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseinlineAttrStmt();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parsenodeStmt();
+            }
+          }
+        }
+      }
+
+      return s0;
+    }
+
+    function peg$parseattrStmt() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      s1 = peg$parsegraph();
+      if (s1 === peg$FAILED) {
+        s1 = peg$parsenode();
+        if (s1 === peg$FAILED) {
+          s1 = peg$parseedge();
+        }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseattrList();
+          if (s3 !== peg$FAILED) {
+            s1 = peg$c8(s1, s3);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseinlineAttrStmt() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parseid();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 61) {
+            s3 = peg$c9;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c10); }
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseid();
+              if (s5 !== peg$FAILED) {
+                s1 = peg$c11(s1, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsenodeStmt() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      s1 = peg$parsenodeId();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseattrList();
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            s1 = peg$c12(s1, s3);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseedgeStmt() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parsenodeIdOrSubgraph();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseedgeRHS();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseattrList();
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                s1 = peg$c13(s1, s3, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsesubgraphStmt() {
+      var s0, s1, s2, s3, s4, s5, s6, s7;
+
+      s0 = peg$currPos;
+      s1 = peg$currPos;
+      s2 = peg$parsesubgraph();
+      if (s2 !== peg$FAILED) {
+        s3 = [];
+        s4 = peg$parse_();
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = peg$parse_();
+        }
+        if (s3 !== peg$FAILED) {
+          s4 = peg$currPos;
+          s5 = peg$parseid();
+          if (s5 !== peg$FAILED) {
+            s6 = [];
+            s7 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
+            }
+            if (s6 !== peg$FAILED) {
+              s5 = [s5, s6];
+              s4 = s5;
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s4;
+            s4 = peg$FAILED;
+          }
+          if (s4 === peg$FAILED) {
+            s4 = null;
+          }
+          if (s4 !== peg$FAILED) {
+            s2 = [s2, s3, s4];
+            s1 = s2;
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 123) {
+          s2 = peg$c0;
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c1); }
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = [];
+          s4 = peg$parse_();
+          while (s4 !== peg$FAILED) {
+            s3.push(s4);
+            s4 = peg$parse_();
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parsestmtList();
+            if (s4 === peg$FAILED) {
+              s4 = null;
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = [];
+              s6 = peg$parse_();
+              while (s6 !== peg$FAILED) {
+                s5.push(s6);
+                s6 = peg$parse_();
+              }
+              if (s5 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 125) {
+                  s6 = peg$c2;
+                  peg$currPos++;
+                } else {
+                  s6 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c3); }
+                }
+                if (s6 !== peg$FAILED) {
+                  s1 = peg$c14(s1, s4);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseattrList() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parseattrListBlock();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = [];
+        s5 = peg$parse_();
+        while (s5 !== peg$FAILED) {
+          s4.push(s5);
+          s5 = peg$parse_();
+        }
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parseattrListBlock();
+          if (s5 !== peg$FAILED) {
+            s4 = [s4, s5];
+            s3 = s4;
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = [];
+          s5 = peg$parse_();
+          while (s5 !== peg$FAILED) {
+            s4.push(s5);
+            s5 = peg$parse_();
+          }
+          if (s4 !== peg$FAILED) {
+            s5 = peg$parseattrListBlock();
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          s1 = peg$c15(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseattrListBlock() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 91) {
+        s1 = peg$c16;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c17); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseaList();
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 93) {
+                s5 = peg$c18;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c19); }
+              }
+              if (s5 !== peg$FAILED) {
+                s1 = peg$c20(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseaList() {
+      var s0, s1, s2, s3, s4, s5, s6, s7;
+
+      s0 = peg$currPos;
+      s1 = peg$parseidDef();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = [];
+        s5 = peg$parse_();
+        while (s5 !== peg$FAILED) {
+          s4.push(s5);
+          s5 = peg$parse_();
+        }
+        if (s4 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 44) {
+            s5 = peg$c21;
+            peg$currPos++;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c22); }
+          }
+          if (s5 === peg$FAILED) {
+            s5 = null;
+          }
+          if (s5 !== peg$FAILED) {
+            s6 = [];
+            s7 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
+            }
+            if (s6 !== peg$FAILED) {
+              s7 = peg$parseidDef();
+              if (s7 !== peg$FAILED) {
+                s4 = [s4, s5, s6, s7];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = [];
+          s5 = peg$parse_();
+          while (s5 !== peg$FAILED) {
+            s4.push(s5);
+            s5 = peg$parse_();
+          }
+          if (s4 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 44) {
+              s5 = peg$c21;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c22); }
+            }
+            if (s5 === peg$FAILED) {
+              s5 = null;
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = [];
+              s7 = peg$parse_();
+              while (s7 !== peg$FAILED) {
+                s6.push(s7);
+                s7 = peg$parse_();
+              }
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parseidDef();
+                if (s7 !== peg$FAILED) {
+                  s4 = [s4, s5, s6, s7];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          s1 = peg$c23(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseedgeRHS() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$currPos;
+      if (input.substr(peg$currPos, 2) === peg$c24) {
+        s2 = peg$c24;
+        peg$currPos += 2;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c25); }
+      }
+      if (s2 !== peg$FAILED) {
+        s3 = peg$c26();
+        if (s3) {
+          s3 = peg$FAILED;
+        } else {
+          s3 = void 0;
+        }
+        if (s3 !== peg$FAILED) {
+          s2 = [s2, s3];
+          s1 = s2;
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 === peg$FAILED) {
+        s1 = peg$currPos;
+        if (input.substr(peg$currPos, 2) === peg$c27) {
+          s2 = peg$c27;
+          peg$currPos += 2;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c28); }
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$c26();
+          if (s3) {
+            s3 = void 0;
+          } else {
+            s3 = peg$FAILED;
+          }
+          if (s3 !== peg$FAILED) {
+            s2 = [s2, s3];
+            s1 = s2;
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parsenodeIdOrSubgraph();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseedgeRHS();
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                s1 = peg$c29(s3, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseidDef() {
+      var s0, s1, s2, s3, s4, s5, s6;
+
+      s0 = peg$currPos;
+      s1 = peg$parseid();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$currPos;
+        s3 = [];
+        s4 = peg$parse_();
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = peg$parse_();
+        }
+        if (s3 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 61) {
+            s4 = peg$c9;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c10); }
+          }
+          if (s4 !== peg$FAILED) {
+            s5 = [];
+            s6 = peg$parse_();
+            while (s6 !== peg$FAILED) {
+              s5.push(s6);
+              s6 = peg$parse_();
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parseid();
+              if (s6 !== peg$FAILED) {
+                s3 = [s3, s4, s5, s6];
+                s2 = s3;
+              } else {
+                peg$currPos = s2;
+                s2 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s2;
+              s2 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s2;
+            s2 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s2;
+          s2 = peg$FAILED;
+        }
+        if (s2 === peg$FAILED) {
+          s2 = null;
+        }
+        if (s2 !== peg$FAILED) {
+          s1 = peg$c30(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsenodeIdOrSubgraph() {
+      var s0, s1;
+
+      s0 = peg$parsesubgraphStmt();
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parsenodeId();
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c31(s1);
+        }
+        s0 = s1;
+      }
+
+      return s0;
+    }
+
+    function peg$parsenodeId() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      s1 = peg$parseid();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseport();
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            s1 = peg$c32(s1);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseport() {
+      var s0, s1, s2, s3, s4, s5, s6, s7, s8;
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 58) {
+        s1 = peg$c33;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c34); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseid();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 58) {
+                s6 = peg$c33;
+                peg$currPos++;
+              } else {
+                s6 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c34); }
+              }
+              if (s6 !== peg$FAILED) {
+                s7 = [];
+                s8 = peg$parse_();
+                while (s8 !== peg$FAILED) {
+                  s7.push(s8);
+                  s8 = peg$parse_();
+                }
+                if (s7 !== peg$FAILED) {
+                  s8 = peg$parsecompassPt();
+                  if (s8 !== peg$FAILED) {
+                    s6 = [s6, s7, s8];
+                    s5 = s6;
+                  } else {
+                    peg$currPos = s5;
+                    s5 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                s1 = [s1, s2, s3, s4, s5];
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsecompassPt() {
+      var s0;
+
+      if (input.substr(peg$currPos, 2) === peg$c35) {
+        s0 = peg$c35;
+        peg$currPos += 2;
+      } else {
+        s0 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c36); }
+      }
+      if (s0 === peg$FAILED) {
+        if (input.substr(peg$currPos, 2) === peg$c37) {
+          s0 = peg$c37;
+          peg$currPos += 2;
+        } else {
+          s0 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c38); }
+        }
+        if (s0 === peg$FAILED) {
+          if (input.substr(peg$currPos, 2) === peg$c39) {
+            s0 = peg$c39;
+            peg$currPos += 2;
+          } else {
+            s0 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c40); }
+          }
+          if (s0 === peg$FAILED) {
+            if (input.substr(peg$currPos, 2) === peg$c41) {
+              s0 = peg$c41;
+              peg$currPos += 2;
+            } else {
+              s0 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c42); }
+            }
+            if (s0 === peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 110) {
+                s0 = peg$c43;
+                peg$currPos++;
+              } else {
+                s0 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c44); }
+              }
+              if (s0 === peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 101) {
+                  s0 = peg$c45;
+                  peg$currPos++;
+                } else {
+                  s0 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c46); }
+                }
+                if (s0 === peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 115) {
+                    s0 = peg$c47;
+                    peg$currPos++;
+                  } else {
+                    s0 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c48); }
+                  }
+                  if (s0 === peg$FAILED) {
+                    if (input.charCodeAt(peg$currPos) === 119) {
+                      s0 = peg$c49;
+                      peg$currPos++;
+                    } else {
+                      s0 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c50); }
+                    }
+                    if (s0 === peg$FAILED) {
+                      if (input.charCodeAt(peg$currPos) === 99) {
+                        s0 = peg$c51;
+                        peg$currPos++;
+                      } else {
+                        s0 = peg$FAILED;
+                        if (peg$silentFails === 0) { peg$fail(peg$c52); }
+                      }
+                      if (s0 === peg$FAILED) {
+                        if (input.charCodeAt(peg$currPos) === 95) {
+                          s0 = peg$c53;
+                          peg$currPos++;
+                        } else {
+                          s0 = peg$FAILED;
+                          if (peg$silentFails === 0) { peg$fail(peg$c54); }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+
+      return s0;
+    }
+
+    function peg$parseid() {
+      var s0, s1, s2, s3, s4, s5, s6;
+
+      peg$silentFails++;
+      s0 = peg$currPos;
+      if (peg$c56.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c57); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c58.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c59); }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c58.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c59); }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          s1 = peg$c60(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 45) {
+          s1 = peg$c61;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c62); }
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s2 = peg$c63;
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c64); }
+          }
+          if (s2 !== peg$FAILED) {
+            s3 = [];
+            if (peg$c65.test(input.charAt(peg$currPos))) {
+              s4 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c66); }
+            }
+            if (s4 !== peg$FAILED) {
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                if (peg$c65.test(input.charAt(peg$currPos))) {
+                  s4 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                }
+              }
+            } else {
+              s3 = peg$FAILED;
+            }
+            if (s3 !== peg$FAILED) {
+              s1 = peg$c67(s1, s2, s3);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 45) {
+            s1 = peg$c61;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c62); }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c65.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c66); }
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c65.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s4 = peg$c63;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c64); }
+              }
+              if (s4 !== peg$FAILED) {
+                s5 = [];
+                if (peg$c65.test(input.charAt(peg$currPos))) {
+                  s6 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s6 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                }
+                while (s6 !== peg$FAILED) {
+                  s5.push(s6);
+                  if (peg$c65.test(input.charAt(peg$currPos))) {
+                    s6 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s6 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s4 = [s4, s5];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+              if (s3 === peg$FAILED) {
+                s3 = null;
+              }
+              if (s3 !== peg$FAILED) {
+                s1 = peg$c68(s1, s2, s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 34) {
+              s1 = peg$c69;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c70); }
+            }
+            if (s1 !== peg$FAILED) {
+              s2 = [];
+              s3 = peg$currPos;
+              if (input.substr(peg$currPos, 2) === peg$c71) {
+                s4 = peg$c71;
+                peg$currPos += 2;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c72); }
+              }
+              if (s4 !== peg$FAILED) {
+                s4 = peg$c73();
+              }
+              s3 = s4;
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c74;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c75); }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (peg$c76.test(input.charAt(peg$currPos))) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    s4 = peg$c78(s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+                if (s3 === peg$FAILED) {
+                  if (peg$c76.test(input.charAt(peg$currPos))) {
+                    s3 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s3 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                  }
+                }
+              }
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                s3 = peg$currPos;
+                if (input.substr(peg$currPos, 2) === peg$c71) {
+                  s4 = peg$c71;
+                  peg$currPos += 2;
+                } else {
+                  s4 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c72); }
+                }
+                if (s4 !== peg$FAILED) {
+                  s4 = peg$c73();
+                }
+                s3 = s4;
+                if (s3 === peg$FAILED) {
+                  s3 = peg$currPos;
+                  if (input.charCodeAt(peg$currPos) === 92) {
+                    s4 = peg$c74;
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c75); }
+                  }
+                  if (s4 !== peg$FAILED) {
+                    if (peg$c76.test(input.charAt(peg$currPos))) {
+                      s5 = input.charAt(peg$currPos);
+                      peg$currPos++;
+                    } else {
+                      s5 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                    }
+                    if (s5 !== peg$FAILED) {
+                      s4 = peg$c78(s5);
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                  if (s3 === peg$FAILED) {
+                    if (peg$c76.test(input.charAt(peg$currPos))) {
+                      s3 = input.charAt(peg$currPos);
+                      peg$currPos++;
+                    } else {
+                      s3 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                    }
+                  }
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 34) {
+                  s3 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c70); }
+                }
+                if (s3 !== peg$FAILED) {
+                  s1 = peg$c79(s2);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          }
+        }
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c55); }
+      }
+
+      return s0;
+    }
+
+    function peg$parsenode() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 4).toLowerCase() === peg$c80) {
+        s1 = input.substr(peg$currPos, 4);
+        peg$currPos += 4;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c81); }
+      }
+      if (s1 !== peg$FAILED) {
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parseedge() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 4).toLowerCase() === peg$c83) {
+        s1 = input.substr(peg$currPos, 4);
+        peg$currPos += 4;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c84); }
+      }
+      if (s1 !== peg$FAILED) {
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsegraph() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 5).toLowerCase() === peg$c85) {
+        s1 = input.substr(peg$currPos, 5);
+        peg$currPos += 5;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c86); }
+      }
+      if (s1 !== peg$FAILED) {
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsedigraph() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 7).toLowerCase() === peg$c87) {
+        s1 = input.substr(peg$currPos, 7);
+        peg$currPos += 7;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c88); }
+      }
+      if (s1 !== peg$FAILED) {
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsesubgraph() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 8).toLowerCase() === peg$c89) {
+        s1 = input.substr(peg$currPos, 8);
+        peg$currPos += 8;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c90); }
+      }
+      if (s1 !== peg$FAILED) {
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsestrict() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 6).toLowerCase() === peg$c91) {
+        s1 = input.substr(peg$currPos, 6);
+        peg$currPos += 6;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c92); }
+      }
+      if (s1 !== peg$FAILED) {
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsegraphType() {
+      var s0, s1;
+
+      s0 = peg$parsegraph();
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parsedigraph();
+        if (s1 !== peg$FAILED) {
+          s1 = peg$c93(s1);
+        }
+        s0 = s1;
+      }
+
+      return s0;
+    }
+
+    function peg$parsewhitespace() {
+      var s0, s1;
+
+      peg$silentFails++;
+      s0 = [];
+      if (peg$c95.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c96); }
+      }
+      if (s1 !== peg$FAILED) {
+        while (s1 !== peg$FAILED) {
+          s0.push(s1);
+          if (peg$c95.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c96); }
+          }
+        }
+      } else {
+        s0 = peg$FAILED;
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c94); }
+      }
+
+      return s0;
+    }
+
+    function peg$parsecomment() {
+      var s0, s1, s2, s3, s4, s5;
+
+      peg$silentFails++;
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 2) === peg$c98) {
+        s1 = peg$c98;
+        peg$currPos += 2;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c99); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c100.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c101); }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c100.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c101); }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          s1 = [s1, s2];
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 2) === peg$c102) {
+          s1 = peg$c102;
+          peg$currPos += 2;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c103); }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$currPos;
+          s4 = peg$currPos;
+          peg$silentFails++;
+          if (input.substr(peg$currPos, 2) === peg$c104) {
+            s5 = peg$c104;
+            peg$currPos += 2;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c105); }
+          }
+          peg$silentFails--;
+          if (s5 === peg$FAILED) {
+            s4 = void 0;
+          } else {
+            peg$currPos = s4;
+            s4 = peg$FAILED;
+          }
+          if (s4 !== peg$FAILED) {
+            if (input.length > peg$currPos) {
+              s5 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c106); }
+            }
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$currPos;
+            s4 = peg$currPos;
+            peg$silentFails++;
+            if (input.substr(peg$currPos, 2) === peg$c104) {
+              s5 = peg$c104;
+              peg$currPos += 2;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c105); }
+            }
+            peg$silentFails--;
+            if (s5 === peg$FAILED) {
+              s4 = void 0;
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.length > peg$currPos) {
+                s5 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c106); }
+              }
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.substr(peg$currPos, 2) === peg$c104) {
+              s3 = peg$c104;
+              peg$currPos += 2;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c105); }
+            }
+            if (s3 !== peg$FAILED) {
+              s1 = [s1, s2, s3];
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c97); }
+      }
+
+      return s0;
+    }
+
+    function peg$parse_() {
+      var s0;
+
+      s0 = peg$parsewhitespace();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsecomment();
+      }
+
+      return s0;
+    }
+
+
+      function merge(a, b, key) {
+
+        function x(a) {
+            a.forEach(function (b) {
+                if (!(b[key] in obj)) {
+                    obj[b[key]] = obj[b[key]] || {};
+                    array.push(obj[b[key]]);
+                }
+                Object.keys(b).forEach(function (k) {
+                    obj[b[key]][k] = b[k];
+                });
+            });
+        }
+
+        var array = [],
+            obj = {};
+
+        x(a);
+        x(b);
+        return array;
+      }
+
+      var directed;
+
+
+    peg$result = peg$startRuleFunction();
+
+    if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+      return peg$result;
+    } else {
+      if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+        peg$fail(peg$endExpectation());
+      }
+
+      throw peg$buildStructuredError(
+        peg$maxFailExpected,
+        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+        peg$maxFailPos < input.length
+          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+      );
+    }
+  }
+
+  root.d3dotparser1 = {
+    SyntaxError: peg$SyntaxError,
+    parse:       peg$parse
+  };
+})(window);
+
+'use strict';
+
+const dotparser = d3dotparser1;
+
+var load = function(url, converter, callback) {
+      if (arguments.length < 3) callback = converter, converter = simple;
+      var r = d3
+          .request(url)
+          .mimeType("text/vnd.graphviz")
+          .response(function(xhr) {
+            return converter(dotparser.parse(xhr.responseText)); });
+      return callback ? r.get(callback) : r;
+  };
+
+  function simple(dotgraph) {
+
+    let nodeMap = {};
+    function addNode(node) {
+      if (nodeMap[node.id]) return;
+      nodeMap[node.id] = node;
+    }
+
+    if (dotgraph.length===0) return null;
+    let fgraph = dotgraph[0];
+
+    fgraph.stmts.filter((s) => s.type === "node" ).forEach(addNode);
+    let edges = fgraph.stmts.filter((s) => s.type === "edge" );
+    let links = [];
+    for(let i=0; i<edges.length; i++) {
+      let edge = edges[i];
+      for(let j=0; j<edge.elems.length-1; j++) {
+        let curr = edge.elems[j];
+        let next = edge.elems[j+1];
+        let link = Object.assign({source:curr.id, target:next.id}, edge.attrs);
+        links.push(link);
+        addNode(curr);
+        addNode(next);
+      }
+    }
+
+    let nodes  = Object.values(nodeMap).map( (n) => Object.assign({id:n.id}, n.attrs));
+    return {
+      nodes,
+      links
+    };
+  }
+
+'use strict';
+
+d3.dot = load;
+
+})));
diff --git a/build/d3-dot-graph.min.js b/build/d3-dot-graph.min.js
new file mode 100644
index 0000000..a8cecd7
--- /dev/null
+++ b/build/d3-dot-graph.min.js
@@ -0,0 +1 @@
+(function(e,r){"object"==typeof exports&&"undefined"!=typeof module?r():"function"==typeof define&&define.amd?define(r):r()})(0,function(){"use strict";function e(e){function r(e){t[e.id]||(t[e.id]=e)}let t={};if(0===e.length)return null;let n=e[0];n.stmts.filter(e=>"node"===e.type).forEach(r);let u=n.stmts.filter(e=>"edge"===e.type),s=[];for(let e=0;e<u.length;e++){let t=u[e];for(let e=0;e<t.elems.length-1;e++){let n=t.elems[e],u=t.elems[e+1],o=Object.assign({source:n.id,target:u.id},t.attrs);s.push(o),r(n),r(u)}}return{nodes:Object.values(t).map(e=>Object.assign({id:e.id},e.attrs)),links:s}}(function(e,r){"function"==typeof define&&define.amd?define([],r):"object"==typeof module&&module.exports&&(module.exports=r())})(0,function(){function e(r,t,n,u){this.message=r,this.expected=t,this.found=n,this.location=u,this.name="SyntaxError","function"==typeof Error.captureStackTrace&&Error.captureStackTrace(this,e)}return function(e,r){function t(){this.constructor=e}t.prototype=r.prototype,e.prototype=new t}(e,Error),e.buildMessage=function(e,r){function t(e){return e.charCodeAt(0).toString(16).toUpperCase()}function n(e){return e.replace(/\\/g,"\\\\").replace(/"/g,'\\"').replace(/\0/g,"\\0").replace(/\t/g,"\\t").replace(/\n/g,"\\n").replace(/\r/g,"\\r").replace(/[\x00-\x0F]/g,function(e){return"\\x0"+t(e)}).replace(/[\x10-\x1F\x7F-\x9F]/g,function(e){return"\\x"+t(e)})}function u(e){return e.replace(/\\/g,"\\\\").replace(/\]/g,"\\]").replace(/\^/g,"\\^").replace(/-/g,"\\-").replace(/\0/g,"\\0").replace(/\t/g,"\\t").replace(/\n/g,"\\n").replace(/\r/g,"\\r").replace(/[\x00-\x0F]/g,function(e){return"\\x0"+t(e)}).replace(/[\x10-\x1F\x7F-\x9F]/g,function(e){return"\\x"+t(e)})}function s(e){return o[e.type](e)}var o={literal:function(e){return'"'+n(e.text)+'"'},class:function(e){var r,t="";for(r=0;r<e.parts.length;r++)t+=e.parts[r]instanceof Array?u(e.parts[r][0])+"-"+u(e.parts[r][1]):u(e.parts[r]);return"["+(e.inverted?"^":"")+t+"]"},any:function(e){return"any character"},end:function(e){return"end of input"},other:function(e){return e.description}};return"Expected "+function(e){var r,t,n=new Array(e.length);for(r=0;r<e.length;r++)n[r]=s(e[r]);if(n.sort(),n.length>0){for(r=1,t=1;r<n.length;r++)n[r-1]!==n[r]&&(n[t]=n[r],t++);n.length=t}switch(n.length){case 1:return n[0];case 2:return n[0]+" or "+n[1];default:return n.slice(0,-1).join(", ")+", or "+n[n.length-1]}}(e)+" but "+function(e){return e?'"'+n(e)+'"':"end of input"}(r)+" found."},{SyntaxError:e,parse:function(r,t){function n(e,r){return{type:"literal",text:e,ignoreCase:r}}function u(e,r,t){return{type:"class",parts:e,inverted:r,ignoreCase:t}}function s(e){return{type:"other",description:e}}function o(e){var t,n=Ir[e];if(n)return n;for(t=e-1;!Ir[t];)t--;for(n={line:(n=Ir[t]).line,column:n.column};t<e;)10===r.charCodeAt(t)?(n.line++,n.column=1):n.column++,t++;return Ir[e]=n,n}function f(e,r){var t=o(e),n=o(r);return{start:{offset:e,line:t.line,column:t.column},end:{offset:r,line:n.line,column:n.column}}}function i(e){Hr<Jr||(Hr>Jr&&(Jr=Hr,Kr=[]),Kr.push(e))}function c(){var e,r;if(e=[],(r=a())!==D)for(;r!==D;)e.push(r),r=a();else e=D;return e}function a(){var e,t,n,u,s,o,f,c,a,h,p,d,A,g;for(e=Hr,t=[],n=q();n!==D;)t.push(n),n=q();if(t!==D)if(n=Hr,(u=R())!==D&&(s=q())!==D?n=u=[u,s]:(Hr=n,n=D),n===D&&(n=null),n!==D)if((u=Z())!==D){for(s=[],o=q();o!==D;)s.push(o),o=q();if(s!==D)if((o=L())===D&&(o=null),o!==D){for(f=[],c=q();c!==D;)f.push(c),c=q();if(f!==D)if(123===r.charCodeAt(Hr)?(c=I,Hr++):(c=D,0===Nr&&i(J)),c!==D){for(a=[],h=q();h!==D;)a.push(h),h=q();if(a!==D)if((h=l())===D&&(h=null),h!==D){for(p=[],d=q();d!==D;)p.push(d),d=q();if(p!==D)if(125===r.charCodeAt(Hr)?(d=K,Hr++):(d=D,0===Nr&&i(N)),d!==D){for(A=[],g=q();g!==D;)A.push(g),g=q();A!==D?e=t=P(n,u,o,h):(Hr=e,e=D)}else Hr=e,e=D;else Hr=e,e=D}else Hr=e,e=D;else Hr=e,e=D}else Hr=e,e=D;else 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diff --git a/example/index.html b/example/index.html
index fd42613..7f6e05d 100644
--- a/example/index.html
+++ b/example/index.html
@@ -23,8 +23,7 @@
   </style>
   <svg width="960" height="600"></svg>
   <script src="https://d3js.org/d3.v4.min.js"></script>
-  <script src="/grammar/dot.js"></script>
-  <script src="/d3-dot-graph.js"></script>
+  <script src="../build/d3-dot-graph.js"></script>
   <script>
 
 var line = d3.line()
@@ -52,7 +51,7 @@ svg.append("svg:defs").selectAll("marker")
     .attr("id", String)
     .attr("viewBox", "0 -5 10 10")
     .attr("refX", 15)
-    .attr("refY", -1.5)
+    .attr("refY", -0.5)
     .attr("markerWidth", 6)
     .attr("markerHeight", 6)
     .attr("orient", "auto")
@@ -102,10 +101,17 @@ var path = svg.append("svg:g").attr("class", "links").selectAll("path")
         .radius(function(d) { return d.y; });
 
     function ticked() {
-      path.attr("d",
-      (d)=>linkGen(d))
-      //(d) => line([[d.source.x, d.source.y], [d.target.x, d.target.y]]));
-
+      path.attr("d", function(d) {
+    var dx = d.target.x - d.source.x,
+        dy = d.target.y - d.source.y,
+        dr = Math.sqrt(dx * dx + dy * dy);
+    return "M" +
+        d.source.x + "," +
+        d.source.y + "A" +
+        dr + "," + dr + " 0 0,1 " +
+        d.target.x + "," +
+        d.target.y;
+});
           node
               .attr("transform", function(d) {
         	    return "translate(" + d.x + "," + d.y + ")"; });
diff --git a/grammar/dot.pegjs b/grammar/dot.pegjs
new file mode 100644
index 0000000..d257f8f
--- /dev/null
+++ b/grammar/dot.pegjs
@@ -0,0 +1,173 @@
+// Simplified DOT grammar
+//
+// Not supported (yet):
+//
+//  * HTML IDs
+
+{
+  function merge(a, b, key) {
+
+    function x(a) {
+        a.forEach(function (b) {
+            if (!(b[key] in obj)) {
+                obj[b[key]] = obj[b[key]] || {};
+                array.push(obj[b[key]]);
+            }
+            Object.keys(b).forEach(function (k) {
+                obj[b[key]][k] = b[k];
+            });
+        });
+    }
+
+    var array = [],
+        obj = {};
+
+    x(a);
+    x(b);
+    return array;
+  }
+
+  var directed;
+}
+
+start
+  = graphStmt+
+
+graphStmt
+  = _* strict:(strict _)? type:graphType _* id:(id)? _* '{' _* stmts:stmtList? _* '}' _* {
+      return {type: type, id: id, strict: strict !== null, stmts: stmts};
+    }
+
+stmtList
+  = first:stmt _* ';'? rest:(_* inner:stmt _* ';'?)* {
+      var result = [first];
+      for (var i = 0; i < rest.length; ++i) {
+        result.push(rest[i][1]);
+      }
+      return result;
+    }
+
+stmt
+  = attrStmt
+  / edgeStmt
+  / subgraphStmt
+  / inlineAttrStmt
+  / nodeStmt
+
+attrStmt
+  = type:(graph / node /edge) _* attrs:attrList {
+      return { type: "attr", attrType: type, attrs: attrs || {}};
+    }
+
+inlineAttrStmt
+  = k:id _* '=' _* v:id {
+      var attrs = {};
+      attrs[k] = v;
+      return { type: "inlineAttr", attrs: attrs };
+    }
+
+nodeStmt
+  = id:nodeId _* attrs:attrList? { return {type: "node", id: id, attrs: attrs || {}}; }
+
+edgeStmt
+  = lhs:(nodeIdOrSubgraph) _* rhs:edgeRHS _* attrs:attrList? {
+      var elems = [lhs];
+      for (var i = 0; i < rhs.length; ++i) {
+        elems.push(rhs[i]);
+      }
+      return { type: "edge", elems: elems, attrs: attrs || {} };
+    }
+
+subgraphStmt
+  = id:(subgraph _* (id _*)?)? '{' _* stmts:stmtList? _* '}' {
+      id = (id && id[2]) || [];
+      return { type: "subgraph", id: id[0], stmts: stmts };
+    }
+
+attrList
+  = first:attrListBlock rest:(_* attrListBlock)* {
+      var result = first;
+      for (var i = 0; i < rest.length; ++i) {
+        merge(result, rest[i][1]);
+      }
+      return result;
+    }
+
+attrListBlock
+  = '[' _* aList:aList? _* ']' { return aList; }
+
+aList
+  = first:idDef rest:(_* ','? _* idDef)* {
+      var result = first;
+      for (var i = 0; i < rest.length; ++i) {
+        _.merge(result, rest[i][3]);
+      }
+      return result;
+    }
+
+edgeRHS
+  = ("--" !{ return directed; } / "->" &{ return directed; }) _* rhs:(nodeIdOrSubgraph) _* rest:edgeRHS? {
+      var result = [rhs];
+      if (rest) {
+        for (var i = 0; i < rest.length; ++i) {
+          result.push(rest[i]);
+        }
+      }
+      return result;
+    }
+
+idDef
+  = k:id v:(_* '=' _* id)? {
+      var result = {};
+      result[k] = v[3];
+      return result;
+    }
+
+nodeIdOrSubgraph
+  = subgraphStmt
+  / id:nodeId { return { type: "node", id: id, attrs: {} }; }
+
+nodeId
+  = id:id _* port? { return id; }
+
+port
+  = ':' _* id _* (':' _* compassPt)?
+
+compassPt
+  = "ne" / "se" / "sw" / "nw" / "n" / "e" / "s" / "w" / "c" / "_"
+
+id "identifier"
+  = fst:[a-zA-Z\u0200-\u0377_] rest:[a-zA-Z\u0200-\u0377_0-9]* { return fst + rest.join(""); }
+  / sign:'-'? dot:'.' after:[0-9]+ {
+      return (sign || "") + dot + after.join("");
+    }
+  / sign:'-'? before:[0-9]+ after:('.' [0-9]*)? {
+      return (sign || "") + before.join("") + (after ? after[0] : "") + (after ? after[1].join("") : "");
+    }
+  / '"' id:("\\\"" { return '"'; } / "\\" ch:[^"] { return "\\" + ch; }  / [^"])* '"' {
+      return id.join("");
+    }
+
+node = k:"node"i { return k.toLowerCase(); }
+edge = k:"edge"i { return k.toLowerCase(); }
+graph = k:"graph"i { return k.toLowerCase(); }
+digraph = k:"digraph"i { return k.toLowerCase(); }
+subgraph = k:"subgraph"i { return k.toLowerCase(); }
+strict = k:"strict"i { return k.toLowerCase(); }
+
+graphType
+  = graph:graph / graph:digraph {
+      directed = graph === "digraph";
+      return graph;
+    }
+
+whitespace "whitespace"
+  = [ \t\r\n]+
+
+comment "comment"
+  = "//" ([^\n])*
+  / "/*" (!"*/" .)* "*/"
+
+_
+  = whitespace
+  / comment
diff --git a/package.json b/package.json
index d4b0551..99444c2 100644
--- a/package.json
+++ b/package.json
@@ -5,17 +5,17 @@
   "main": "index.js",
   "scripts": {
     "test": "mocha test/*.js",
-    "build": "pegjs --format globals --export-var d3dot grammar/dot.pegjs ",
+    "build": "pegjs --format globals --export-var d3dotparser1 --output src/dot-parser.js grammar/dot.pegjs; rollup -c",
+    "prepublish": "rollup -c && uglifyjs build/d3-dot-graph.js -c negate_iife=false -m -o build/d3-dot-graph.min.js",
     "start": "npm run build"
   },
-  ,
   "keywords": [
     "dot",
     "graphviz",
     "d3",
     "graph"
   ],
-    "repository": {
+  "repository": {
     "type": "git",
     "url": "git+https://github.com/gmamaladze/d3-dot-graph.git"
   },
@@ -25,5 +25,9 @@
     "url": "https://github.com/gmamaladze/d3-dot-graph/issues"
   },
   "homepage": "https://github.com/gmamaladze/d3-dot-graph#readme",
-  "dependencies": {}
+  "dependencies": {
+    "pegjs": "^0.10.0",
+    "rollup": "^0.49.2",
+    "rollup-watch": "^4.3.1"
+  }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..9707b5e
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,9 @@
+export default {
+    input: "src/index.js",
+    name: "d3dot",
+    context: "window",
+    output: {
+      format: "umd",
+      file: "build/d3-dot-graph.js"
+    }
+};
diff --git a/src/dot-parser.js b/src/dot-parser.js
new file mode 100644
index 0000000..ffb77e8
--- /dev/null
+++ b/src/dot-parser.js
@@ -0,0 +1,2491 @@
+/*
+ * Generated by PEG.js 0.10.0.
+ *
+ * http://pegjs.org/
+ */
+(function(root) {
+  "use strict";
+
+  function peg$subclass(child, parent) {
+    function ctor() { this.constructor = child; }
+    ctor.prototype = parent.prototype;
+    child.prototype = new ctor();
+  }
+
+  function peg$SyntaxError(message, expected, found, location) {
+    this.message  = message;
+    this.expected = expected;
+    this.found    = found;
+    this.location = location;
+    this.name     = "SyntaxError";
+
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, peg$SyntaxError);
+    }
+  }
+
+  peg$subclass(peg$SyntaxError, Error);
+
+  peg$SyntaxError.buildMessage = function(expected, found) {
+    var DESCRIBE_EXPECTATION_FNS = {
+          literal: function(expectation) {
+            return "\"" + literalEscape(expectation.text) + "\"";
+          },
+
+          "class": function(expectation) {
+            var escapedParts = "",
+                i;
+
+            for (i = 0; i < expectation.parts.length; i++) {
+              escapedParts += expectation.parts[i] instanceof Array
+                ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1])
+                : classEscape(expectation.parts[i]);
+            }
+
+            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+          },
+
+          any: function(expectation) {
+            return "any character";
+          },
+
+          end: function(expectation) {
+            return "end of input";
+          },
+
+          other: function(expectation) {
+            return expectation.description;
+          }
+        };
+
+    function hex(ch) {
+      return ch.charCodeAt(0).toString(16).toUpperCase();
+    }
+
+    function literalEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/"/g,  '\\"')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function classEscape(s) {
+      return s
+        .replace(/\\/g, '\\\\')
+        .replace(/\]/g, '\\]')
+        .replace(/\^/g, '\\^')
+        .replace(/-/g,  '\\-')
+        .replace(/\0/g, '\\0')
+        .replace(/\t/g, '\\t')
+        .replace(/\n/g, '\\n')
+        .replace(/\r/g, '\\r')
+        .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
+        .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
+    }
+
+    function describeExpectation(expectation) {
+      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+    }
+
+    function describeExpected(expected) {
+      var descriptions = new Array(expected.length),
+          i, j;
+
+      for (i = 0; i < expected.length; i++) {
+        descriptions[i] = describeExpectation(expected[i]);
+      }
+
+      descriptions.sort();
+
+      if (descriptions.length > 0) {
+        for (i = 1, j = 1; i < descriptions.length; i++) {
+          if (descriptions[i - 1] !== descriptions[i]) {
+            descriptions[j] = descriptions[i];
+            j++;
+          }
+        }
+        descriptions.length = j;
+      }
+
+      switch (descriptions.length) {
+        case 1:
+          return descriptions[0];
+
+        case 2:
+          return descriptions[0] + " or " + descriptions[1];
+
+        default:
+          return descriptions.slice(0, -1).join(", ")
+            + ", or "
+            + descriptions[descriptions.length - 1];
+      }
+    }
+
+    function describeFound(found) {
+      return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+    }
+
+    return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+  };
+
+  function peg$parse(input, options) {
+    options = options !== void 0 ? options : {};
+
+    var peg$FAILED = {},
+
+        peg$startRuleFunctions = { start: peg$parsestart },
+        peg$startRuleFunction  = peg$parsestart,
+
+        peg$c0 = "{",
+        peg$c1 = peg$literalExpectation("{", false),
+        peg$c2 = "}",
+        peg$c3 = peg$literalExpectation("}", false),
+        peg$c4 = function(strict, type, id, stmts) {
+              return {type: type, id: id, strict: strict !== null, stmts: stmts};
+            },
+        peg$c5 = ";",
+        peg$c6 = peg$literalExpectation(";", false),
+        peg$c7 = function(first, rest) {
+              var result = [first];
+              for (var i = 0; i < rest.length; ++i) {
+                result.push(rest[i][1]);
+              }
+              return result;
+            },
+        peg$c8 = function(type, attrs) {
+              return { type: "attr", attrType: type, attrs: attrs || {}};
+            },
+        peg$c9 = "=",
+        peg$c10 = peg$literalExpectation("=", false),
+        peg$c11 = function(k, v) {
+              var attrs = {};
+              attrs[k] = v;
+              return { type: "inlineAttr", attrs: attrs };
+            },
+        peg$c12 = function(id, attrs) { return {type: "node", id: id, attrs: attrs || {}}; },
+        peg$c13 = function(lhs, rhs, attrs) {
+              var elems = [lhs];
+              for (var i = 0; i < rhs.length; ++i) {
+                elems.push(rhs[i]);
+              }
+              return { type: "edge", elems: elems, attrs: attrs || {} };
+            },
+        peg$c14 = function(id, stmts) {
+              id = (id && id[2]) || [];
+              return { type: "subgraph", id: id[0], stmts: stmts };
+            },
+        peg$c15 = function(first, rest) {
+              var result = first;
+              for (var i = 0; i < rest.length; ++i) {
+                merge(result, rest[i][1]);
+              }
+              return result;
+            },
+        peg$c16 = "[",
+        peg$c17 = peg$literalExpectation("[", false),
+        peg$c18 = "]",
+        peg$c19 = peg$literalExpectation("]", false),
+        peg$c20 = function(aList) { return aList; },
+        peg$c21 = ",",
+        peg$c22 = peg$literalExpectation(",", false),
+        peg$c23 = function(first, rest) {
+              var result = first;
+              for (var i = 0; i < rest.length; ++i) {
+                _.merge(result, rest[i][3]);
+              }
+              return result;
+            },
+        peg$c24 = "--",
+        peg$c25 = peg$literalExpectation("--", false),
+        peg$c26 = function() { return directed; },
+        peg$c27 = "->",
+        peg$c28 = peg$literalExpectation("->", false),
+        peg$c29 = function(rhs, rest) {
+              var result = [rhs];
+              if (rest) {
+                for (var i = 0; i < rest.length; ++i) {
+                  result.push(rest[i]);
+                }
+              }
+              return result;
+            },
+        peg$c30 = function(k, v) {
+              var result = {};
+              result[k] = v[3];
+              return result;
+            },
+        peg$c31 = function(id) { return { type: "node", id: id, attrs: {} }; },
+        peg$c32 = function(id) { return id; },
+        peg$c33 = ":",
+        peg$c34 = peg$literalExpectation(":", false),
+        peg$c35 = "ne",
+        peg$c36 = peg$literalExpectation("ne", false),
+        peg$c37 = "se",
+        peg$c38 = peg$literalExpectation("se", false),
+        peg$c39 = "sw",
+        peg$c40 = peg$literalExpectation("sw", false),
+        peg$c41 = "nw",
+        peg$c42 = peg$literalExpectation("nw", false),
+        peg$c43 = "n",
+        peg$c44 = peg$literalExpectation("n", false),
+        peg$c45 = "e",
+        peg$c46 = peg$literalExpectation("e", false),
+        peg$c47 = "s",
+        peg$c48 = peg$literalExpectation("s", false),
+        peg$c49 = "w",
+        peg$c50 = peg$literalExpectation("w", false),
+        peg$c51 = "c",
+        peg$c52 = peg$literalExpectation("c", false),
+        peg$c53 = "_",
+        peg$c54 = peg$literalExpectation("_", false),
+        peg$c55 = peg$otherExpectation("identifier"),
+        peg$c56 = /^[a-zA-Z\u0200-\u0377_]/,
+        peg$c57 = peg$classExpectation([["a", "z"], ["A", "Z"], ["\u0200", "\u0377"], "_"], false, false),
+        peg$c58 = /^[a-zA-Z\u0200-\u0377_0-9]/,
+        peg$c59 = peg$classExpectation([["a", "z"], ["A", "Z"], ["\u0200", "\u0377"], "_", ["0", "9"]], false, false),
+        peg$c60 = function(fst, rest) { return fst + rest.join(""); },
+        peg$c61 = "-",
+        peg$c62 = peg$literalExpectation("-", false),
+        peg$c63 = ".",
+        peg$c64 = peg$literalExpectation(".", false),
+        peg$c65 = /^[0-9]/,
+        peg$c66 = peg$classExpectation([["0", "9"]], false, false),
+        peg$c67 = function(sign, dot, after) {
+              return (sign || "") + dot + after.join("");
+            },
+        peg$c68 = function(sign, before, after) {
+              return (sign || "") + before.join("") + (after ? after[0] : "") + (after ? after[1].join("") : "");
+            },
+        peg$c69 = "\"",
+        peg$c70 = peg$literalExpectation("\"", false),
+        peg$c71 = "\\\"",
+        peg$c72 = peg$literalExpectation("\\\"", false),
+        peg$c73 = function() { return '"'; },
+        peg$c74 = "\\",
+        peg$c75 = peg$literalExpectation("\\", false),
+        peg$c76 = /^[^"]/,
+        peg$c77 = peg$classExpectation(["\""], true, false),
+        peg$c78 = function(ch) { return "\\" + ch; },
+        peg$c79 = function(id) {
+              return id.join("");
+            },
+        peg$c80 = "node",
+        peg$c81 = peg$literalExpectation("node", true),
+        peg$c82 = function(k) { return k.toLowerCase(); },
+        peg$c83 = "edge",
+        peg$c84 = peg$literalExpectation("edge", true),
+        peg$c85 = "graph",
+        peg$c86 = peg$literalExpectation("graph", true),
+        peg$c87 = "digraph",
+        peg$c88 = peg$literalExpectation("digraph", true),
+        peg$c89 = "subgraph",
+        peg$c90 = peg$literalExpectation("subgraph", true),
+        peg$c91 = "strict",
+        peg$c92 = peg$literalExpectation("strict", true),
+        peg$c93 = function(graph) {
+              directed = graph === "digraph";
+              return graph;
+            },
+        peg$c94 = peg$otherExpectation("whitespace"),
+        peg$c95 = /^[ \t\r\n]/,
+        peg$c96 = peg$classExpectation([" ", "\t", "\r", "\n"], false, false),
+        peg$c97 = peg$otherExpectation("comment"),
+        peg$c98 = "//",
+        peg$c99 = peg$literalExpectation("//", false),
+        peg$c100 = /^[^\n]/,
+        peg$c101 = peg$classExpectation(["\n"], true, false),
+        peg$c102 = "/*",
+        peg$c103 = peg$literalExpectation("/*", false),
+        peg$c104 = "*/",
+        peg$c105 = peg$literalExpectation("*/", false),
+        peg$c106 = peg$anyExpectation(),
+
+        peg$currPos          = 0,
+        peg$savedPos         = 0,
+        peg$posDetailsCache  = [{ line: 1, column: 1 }],
+        peg$maxFailPos       = 0,
+        peg$maxFailExpected  = [],
+        peg$silentFails      = 0,
+
+        peg$result;
+
+    if ("startRule" in options) {
+      if (!(options.startRule in peg$startRuleFunctions)) {
+        throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+      }
+
+      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+    }
+
+    function text() {
+      return input.substring(peg$savedPos, peg$currPos);
+    }
+
+    function location() {
+      return peg$computeLocation(peg$savedPos, peg$currPos);
+    }
+
+    function expected(description, location) {
+      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
+
+      throw peg$buildStructuredError(
+        [peg$otherExpectation(description)],
+        input.substring(peg$savedPos, peg$currPos),
+        location
+      );
+    }
+
+    function error(message, location) {
+      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
+
+      throw peg$buildSimpleError(message, location);
+    }
+
+    function peg$literalExpectation(text, ignoreCase) {
+      return { type: "literal", text: text, ignoreCase: ignoreCase };
+    }
+
+    function peg$classExpectation(parts, inverted, ignoreCase) {
+      return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+    }
+
+    function peg$anyExpectation() {
+      return { type: "any" };
+    }
+
+    function peg$endExpectation() {
+      return { type: "end" };
+    }
+
+    function peg$otherExpectation(description) {
+      return { type: "other", description: description };
+    }
+
+    function peg$computePosDetails(pos) {
+      var details = peg$posDetailsCache[pos], p;
+
+      if (details) {
+        return details;
+      } else {
+        p = pos - 1;
+        while (!peg$posDetailsCache[p]) {
+          p--;
+        }
+
+        details = peg$posDetailsCache[p];
+        details = {
+          line:   details.line,
+          column: details.column
+        };
+
+        while (p < pos) {
+          if (input.charCodeAt(p) === 10) {
+            details.line++;
+            details.column = 1;
+          } else {
+            details.column++;
+          }
+
+          p++;
+        }
+
+        peg$posDetailsCache[pos] = details;
+        return details;
+      }
+    }
+
+    function peg$computeLocation(startPos, endPos) {
+      var startPosDetails = peg$computePosDetails(startPos),
+          endPosDetails   = peg$computePosDetails(endPos);
+
+      return {
+        start: {
+          offset: startPos,
+          line:   startPosDetails.line,
+          column: startPosDetails.column
+        },
+        end: {
+          offset: endPos,
+          line:   endPosDetails.line,
+          column: endPosDetails.column
+        }
+      };
+    }
+
+    function peg$fail(expected) {
+      if (peg$currPos < peg$maxFailPos) { return; }
+
+      if (peg$currPos > peg$maxFailPos) {
+        peg$maxFailPos = peg$currPos;
+        peg$maxFailExpected = [];
+      }
+
+      peg$maxFailExpected.push(expected);
+    }
+
+    function peg$buildSimpleError(message, location) {
+      return new peg$SyntaxError(message, null, null, location);
+    }
+
+    function peg$buildStructuredError(expected, found, location) {
+      return new peg$SyntaxError(
+        peg$SyntaxError.buildMessage(expected, found),
+        expected,
+        found,
+        location
+      );
+    }
+
+    function peg$parsestart() {
+      var s0, s1;
+
+      s0 = [];
+      s1 = peg$parsegraphStmt();
+      if (s1 !== peg$FAILED) {
+        while (s1 !== peg$FAILED) {
+          s0.push(s1);
+          s1 = peg$parsegraphStmt();
+        }
+      } else {
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsegraphStmt() {
+      var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13;
+
+      s0 = peg$currPos;
+      s1 = [];
+      s2 = peg$parse_();
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parse_();
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = peg$currPos;
+        s3 = peg$parsestrict();
+        if (s3 !== peg$FAILED) {
+          s4 = peg$parse_();
+          if (s4 !== peg$FAILED) {
+            s3 = [s3, s4];
+            s2 = s3;
+          } else {
+            peg$currPos = s2;
+            s2 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s2;
+          s2 = peg$FAILED;
+        }
+        if (s2 === peg$FAILED) {
+          s2 = null;
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parsegraphType();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseid();
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                s6 = [];
+                s7 = peg$parse_();
+                while (s7 !== peg$FAILED) {
+                  s6.push(s7);
+                  s7 = peg$parse_();
+                }
+                if (s6 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 123) {
+                    s7 = peg$c0;
+                    peg$currPos++;
+                  } else {
+                    s7 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c1); }
+                  }
+                  if (s7 !== peg$FAILED) {
+                    s8 = [];
+                    s9 = peg$parse_();
+                    while (s9 !== peg$FAILED) {
+                      s8.push(s9);
+                      s9 = peg$parse_();
+                    }
+                    if (s8 !== peg$FAILED) {
+                      s9 = peg$parsestmtList();
+                      if (s9 === peg$FAILED) {
+                        s9 = null;
+                      }
+                      if (s9 !== peg$FAILED) {
+                        s10 = [];
+                        s11 = peg$parse_();
+                        while (s11 !== peg$FAILED) {
+                          s10.push(s11);
+                          s11 = peg$parse_();
+                        }
+                        if (s10 !== peg$FAILED) {
+                          if (input.charCodeAt(peg$currPos) === 125) {
+                            s11 = peg$c2;
+                            peg$currPos++;
+                          } else {
+                            s11 = peg$FAILED;
+                            if (peg$silentFails === 0) { peg$fail(peg$c3); }
+                          }
+                          if (s11 !== peg$FAILED) {
+                            s12 = [];
+                            s13 = peg$parse_();
+                            while (s13 !== peg$FAILED) {
+                              s12.push(s13);
+                              s13 = peg$parse_();
+                            }
+                            if (s12 !== peg$FAILED) {
+                              peg$savedPos = s0;
+                              s1 = peg$c4(s2, s3, s5, s9);
+                              s0 = s1;
+                            } else {
+                              peg$currPos = s0;
+                              s0 = peg$FAILED;
+                            }
+                          } else {
+                            peg$currPos = s0;
+                            s0 = peg$FAILED;
+                          }
+                        } else {
+                          peg$currPos = s0;
+                          s0 = peg$FAILED;
+                        }
+                      } else {
+                        peg$currPos = s0;
+                        s0 = peg$FAILED;
+                      }
+                    } else {
+                      peg$currPos = s0;
+                      s0 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s0;
+                    s0 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsestmtList() {
+      var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+      s0 = peg$currPos;
+      s1 = peg$parsestmt();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 59) {
+            s3 = peg$c5;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c6); }
+          }
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$currPos;
+            s6 = [];
+            s7 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
+            }
+            if (s6 !== peg$FAILED) {
+              s7 = peg$parsestmt();
+              if (s7 !== peg$FAILED) {
+                s8 = [];
+                s9 = peg$parse_();
+                while (s9 !== peg$FAILED) {
+                  s8.push(s9);
+                  s9 = peg$parse_();
+                }
+                if (s8 !== peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 59) {
+                    s9 = peg$c5;
+                    peg$currPos++;
+                  } else {
+                    s9 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c6); }
+                  }
+                  if (s9 === peg$FAILED) {
+                    s9 = null;
+                  }
+                  if (s9 !== peg$FAILED) {
+                    s6 = [s6, s7, s8, s9];
+                    s5 = s6;
+                  } else {
+                    peg$currPos = s5;
+                    s5 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s5;
+              s5 = peg$FAILED;
+            }
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$currPos;
+              s6 = [];
+              s7 = peg$parse_();
+              while (s7 !== peg$FAILED) {
+                s6.push(s7);
+                s7 = peg$parse_();
+              }
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parsestmt();
+                if (s7 !== peg$FAILED) {
+                  s8 = [];
+                  s9 = peg$parse_();
+                  while (s9 !== peg$FAILED) {
+                    s8.push(s9);
+                    s9 = peg$parse_();
+                  }
+                  if (s8 !== peg$FAILED) {
+                    if (input.charCodeAt(peg$currPos) === 59) {
+                      s9 = peg$c5;
+                      peg$currPos++;
+                    } else {
+                      s9 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c6); }
+                    }
+                    if (s9 === peg$FAILED) {
+                      s9 = null;
+                    }
+                    if (s9 !== peg$FAILED) {
+                      s6 = [s6, s7, s8, s9];
+                      s5 = s6;
+                    } else {
+                      peg$currPos = s5;
+                      s5 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s5;
+                    s5 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+            }
+            if (s4 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s1 = peg$c7(s1, s4);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsestmt() {
+      var s0;
+
+      s0 = peg$parseattrStmt();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseedgeStmt();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parsesubgraphStmt();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseinlineAttrStmt();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parsenodeStmt();
+            }
+          }
+        }
+      }
+
+      return s0;
+    }
+
+    function peg$parseattrStmt() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      s1 = peg$parsegraph();
+      if (s1 === peg$FAILED) {
+        s1 = peg$parsenode();
+        if (s1 === peg$FAILED) {
+          s1 = peg$parseedge();
+        }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseattrList();
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c8(s1, s3);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseinlineAttrStmt() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parseid();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 61) {
+            s3 = peg$c9;
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c10); }
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseid();
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c11(s1, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsenodeStmt() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      s1 = peg$parsenodeId();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseattrList();
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c12(s1, s3);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseedgeStmt() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parsenodeIdOrSubgraph();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseedgeRHS();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseattrList();
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c13(s1, s3, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsesubgraphStmt() {
+      var s0, s1, s2, s3, s4, s5, s6, s7;
+
+      s0 = peg$currPos;
+      s1 = peg$currPos;
+      s2 = peg$parsesubgraph();
+      if (s2 !== peg$FAILED) {
+        s3 = [];
+        s4 = peg$parse_();
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = peg$parse_();
+        }
+        if (s3 !== peg$FAILED) {
+          s4 = peg$currPos;
+          s5 = peg$parseid();
+          if (s5 !== peg$FAILED) {
+            s6 = [];
+            s7 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
+            }
+            if (s6 !== peg$FAILED) {
+              s5 = [s5, s6];
+              s4 = s5;
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s4;
+            s4 = peg$FAILED;
+          }
+          if (s4 === peg$FAILED) {
+            s4 = null;
+          }
+          if (s4 !== peg$FAILED) {
+            s2 = [s2, s3, s4];
+            s1 = s2;
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 === peg$FAILED) {
+        s1 = null;
+      }
+      if (s1 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 123) {
+          s2 = peg$c0;
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c1); }
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = [];
+          s4 = peg$parse_();
+          while (s4 !== peg$FAILED) {
+            s3.push(s4);
+            s4 = peg$parse_();
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = peg$parsestmtList();
+            if (s4 === peg$FAILED) {
+              s4 = null;
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = [];
+              s6 = peg$parse_();
+              while (s6 !== peg$FAILED) {
+                s5.push(s6);
+                s6 = peg$parse_();
+              }
+              if (s5 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 125) {
+                  s6 = peg$c2;
+                  peg$currPos++;
+                } else {
+                  s6 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c3); }
+                }
+                if (s6 !== peg$FAILED) {
+                  peg$savedPos = s0;
+                  s1 = peg$c14(s1, s4);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseattrList() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$parseattrListBlock();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = [];
+        s5 = peg$parse_();
+        while (s5 !== peg$FAILED) {
+          s4.push(s5);
+          s5 = peg$parse_();
+        }
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parseattrListBlock();
+          if (s5 !== peg$FAILED) {
+            s4 = [s4, s5];
+            s3 = s4;
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = [];
+          s5 = peg$parse_();
+          while (s5 !== peg$FAILED) {
+            s4.push(s5);
+            s5 = peg$parse_();
+          }
+          if (s4 !== peg$FAILED) {
+            s5 = peg$parseattrListBlock();
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c15(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseattrListBlock() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 91) {
+        s1 = peg$c16;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c17); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseaList();
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 93) {
+                s5 = peg$c18;
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c19); }
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c20(s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseaList() {
+      var s0, s1, s2, s3, s4, s5, s6, s7;
+
+      s0 = peg$currPos;
+      s1 = peg$parseidDef();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$currPos;
+        s4 = [];
+        s5 = peg$parse_();
+        while (s5 !== peg$FAILED) {
+          s4.push(s5);
+          s5 = peg$parse_();
+        }
+        if (s4 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 44) {
+            s5 = peg$c21;
+            peg$currPos++;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c22); }
+          }
+          if (s5 === peg$FAILED) {
+            s5 = null;
+          }
+          if (s5 !== peg$FAILED) {
+            s6 = [];
+            s7 = peg$parse_();
+            while (s7 !== peg$FAILED) {
+              s6.push(s7);
+              s7 = peg$parse_();
+            }
+            if (s6 !== peg$FAILED) {
+              s7 = peg$parseidDef();
+              if (s7 !== peg$FAILED) {
+                s4 = [s4, s5, s6, s7];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$currPos;
+          s4 = [];
+          s5 = peg$parse_();
+          while (s5 !== peg$FAILED) {
+            s4.push(s5);
+            s5 = peg$parse_();
+          }
+          if (s4 !== peg$FAILED) {
+            if (input.charCodeAt(peg$currPos) === 44) {
+              s5 = peg$c21;
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c22); }
+            }
+            if (s5 === peg$FAILED) {
+              s5 = null;
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = [];
+              s7 = peg$parse_();
+              while (s7 !== peg$FAILED) {
+                s6.push(s7);
+                s7 = peg$parse_();
+              }
+              if (s6 !== peg$FAILED) {
+                s7 = peg$parseidDef();
+                if (s7 !== peg$FAILED) {
+                  s4 = [s4, s5, s6, s7];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c23(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseedgeRHS() {
+      var s0, s1, s2, s3, s4, s5;
+
+      s0 = peg$currPos;
+      s1 = peg$currPos;
+      if (input.substr(peg$currPos, 2) === peg$c24) {
+        s2 = peg$c24;
+        peg$currPos += 2;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c25); }
+      }
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = peg$currPos;
+        s3 = peg$c26();
+        if (s3) {
+          s3 = peg$FAILED;
+        } else {
+          s3 = void 0;
+        }
+        if (s3 !== peg$FAILED) {
+          s2 = [s2, s3];
+          s1 = s2;
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s1;
+        s1 = peg$FAILED;
+      }
+      if (s1 === peg$FAILED) {
+        s1 = peg$currPos;
+        if (input.substr(peg$currPos, 2) === peg$c27) {
+          s2 = peg$c27;
+          peg$currPos += 2;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c28); }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = peg$currPos;
+          s3 = peg$c26();
+          if (s3) {
+            s3 = void 0;
+          } else {
+            s3 = peg$FAILED;
+          }
+          if (s3 !== peg$FAILED) {
+            s2 = [s2, s3];
+            s1 = s2;
+          } else {
+            peg$currPos = s1;
+            s1 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s1;
+          s1 = peg$FAILED;
+        }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parsenodeIdOrSubgraph();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$parseedgeRHS();
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c29(s3, s5);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseidDef() {
+      var s0, s1, s2, s3, s4, s5, s6;
+
+      s0 = peg$currPos;
+      s1 = peg$parseid();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$currPos;
+        s3 = [];
+        s4 = peg$parse_();
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = peg$parse_();
+        }
+        if (s3 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 61) {
+            s4 = peg$c9;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c10); }
+          }
+          if (s4 !== peg$FAILED) {
+            s5 = [];
+            s6 = peg$parse_();
+            while (s6 !== peg$FAILED) {
+              s5.push(s6);
+              s6 = peg$parse_();
+            }
+            if (s5 !== peg$FAILED) {
+              s6 = peg$parseid();
+              if (s6 !== peg$FAILED) {
+                s3 = [s3, s4, s5, s6];
+                s2 = s3;
+              } else {
+                peg$currPos = s2;
+                s2 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s2;
+              s2 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s2;
+            s2 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s2;
+          s2 = peg$FAILED;
+        }
+        if (s2 === peg$FAILED) {
+          s2 = null;
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c30(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsenodeIdOrSubgraph() {
+      var s0, s1;
+
+      s0 = peg$parsesubgraphStmt();
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parsenodeId();
+        if (s1 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c31(s1);
+        }
+        s0 = s1;
+      }
+
+      return s0;
+    }
+
+    function peg$parsenodeId() {
+      var s0, s1, s2, s3;
+
+      s0 = peg$currPos;
+      s1 = peg$parseid();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseport();
+          if (s3 === peg$FAILED) {
+            s3 = null;
+          }
+          if (s3 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s1 = peg$c32(s1);
+            s0 = s1;
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parseport() {
+      var s0, s1, s2, s3, s4, s5, s6, s7, s8;
+
+      s0 = peg$currPos;
+      if (input.charCodeAt(peg$currPos) === 58) {
+        s1 = peg$c33;
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c34); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parse_();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parse_();
+        }
+        if (s2 !== peg$FAILED) {
+          s3 = peg$parseid();
+          if (s3 !== peg$FAILED) {
+            s4 = [];
+            s5 = peg$parse_();
+            while (s5 !== peg$FAILED) {
+              s4.push(s5);
+              s5 = peg$parse_();
+            }
+            if (s4 !== peg$FAILED) {
+              s5 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 58) {
+                s6 = peg$c33;
+                peg$currPos++;
+              } else {
+                s6 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c34); }
+              }
+              if (s6 !== peg$FAILED) {
+                s7 = [];
+                s8 = peg$parse_();
+                while (s8 !== peg$FAILED) {
+                  s7.push(s8);
+                  s8 = peg$parse_();
+                }
+                if (s7 !== peg$FAILED) {
+                  s8 = peg$parsecompassPt();
+                  if (s8 !== peg$FAILED) {
+                    s6 = [s6, s7, s8];
+                    s5 = s6;
+                  } else {
+                    peg$currPos = s5;
+                    s5 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s5;
+                  s5 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s5;
+                s5 = peg$FAILED;
+              }
+              if (s5 === peg$FAILED) {
+                s5 = null;
+              }
+              if (s5 !== peg$FAILED) {
+                s1 = [s1, s2, s3, s4, s5];
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+
+      return s0;
+    }
+
+    function peg$parsecompassPt() {
+      var s0;
+
+      if (input.substr(peg$currPos, 2) === peg$c35) {
+        s0 = peg$c35;
+        peg$currPos += 2;
+      } else {
+        s0 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c36); }
+      }
+      if (s0 === peg$FAILED) {
+        if (input.substr(peg$currPos, 2) === peg$c37) {
+          s0 = peg$c37;
+          peg$currPos += 2;
+        } else {
+          s0 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c38); }
+        }
+        if (s0 === peg$FAILED) {
+          if (input.substr(peg$currPos, 2) === peg$c39) {
+            s0 = peg$c39;
+            peg$currPos += 2;
+          } else {
+            s0 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c40); }
+          }
+          if (s0 === peg$FAILED) {
+            if (input.substr(peg$currPos, 2) === peg$c41) {
+              s0 = peg$c41;
+              peg$currPos += 2;
+            } else {
+              s0 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c42); }
+            }
+            if (s0 === peg$FAILED) {
+              if (input.charCodeAt(peg$currPos) === 110) {
+                s0 = peg$c43;
+                peg$currPos++;
+              } else {
+                s0 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c44); }
+              }
+              if (s0 === peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 101) {
+                  s0 = peg$c45;
+                  peg$currPos++;
+                } else {
+                  s0 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c46); }
+                }
+                if (s0 === peg$FAILED) {
+                  if (input.charCodeAt(peg$currPos) === 115) {
+                    s0 = peg$c47;
+                    peg$currPos++;
+                  } else {
+                    s0 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c48); }
+                  }
+                  if (s0 === peg$FAILED) {
+                    if (input.charCodeAt(peg$currPos) === 119) {
+                      s0 = peg$c49;
+                      peg$currPos++;
+                    } else {
+                      s0 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c50); }
+                    }
+                    if (s0 === peg$FAILED) {
+                      if (input.charCodeAt(peg$currPos) === 99) {
+                        s0 = peg$c51;
+                        peg$currPos++;
+                      } else {
+                        s0 = peg$FAILED;
+                        if (peg$silentFails === 0) { peg$fail(peg$c52); }
+                      }
+                      if (s0 === peg$FAILED) {
+                        if (input.charCodeAt(peg$currPos) === 95) {
+                          s0 = peg$c53;
+                          peg$currPos++;
+                        } else {
+                          s0 = peg$FAILED;
+                          if (peg$silentFails === 0) { peg$fail(peg$c54); }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+
+      return s0;
+    }
+
+    function peg$parseid() {
+      var s0, s1, s2, s3, s4, s5, s6;
+
+      peg$silentFails++;
+      s0 = peg$currPos;
+      if (peg$c56.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c57); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c58.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c59); }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c58.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c59); }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c60(s1, s2);
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        if (input.charCodeAt(peg$currPos) === 45) {
+          s1 = peg$c61;
+          peg$currPos++;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c62); }
+        }
+        if (s1 === peg$FAILED) {
+          s1 = null;
+        }
+        if (s1 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s2 = peg$c63;
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c64); }
+          }
+          if (s2 !== peg$FAILED) {
+            s3 = [];
+            if (peg$c65.test(input.charAt(peg$currPos))) {
+              s4 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s4 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c66); }
+            }
+            if (s4 !== peg$FAILED) {
+              while (s4 !== peg$FAILED) {
+                s3.push(s4);
+                if (peg$c65.test(input.charAt(peg$currPos))) {
+                  s4 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                }
+              }
+            } else {
+              s3 = peg$FAILED;
+            }
+            if (s3 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s1 = peg$c67(s1, s2, s3);
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+        if (s0 === peg$FAILED) {
+          s0 = peg$currPos;
+          if (input.charCodeAt(peg$currPos) === 45) {
+            s1 = peg$c61;
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c62); }
+          }
+          if (s1 === peg$FAILED) {
+            s1 = null;
+          }
+          if (s1 !== peg$FAILED) {
+            s2 = [];
+            if (peg$c65.test(input.charAt(peg$currPos))) {
+              s3 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c66); }
+            }
+            if (s3 !== peg$FAILED) {
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                if (peg$c65.test(input.charAt(peg$currPos))) {
+                  s3 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                }
+              }
+            } else {
+              s2 = peg$FAILED;
+            }
+            if (s2 !== peg$FAILED) {
+              s3 = peg$currPos;
+              if (input.charCodeAt(peg$currPos) === 46) {
+                s4 = peg$c63;
+                peg$currPos++;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c64); }
+              }
+              if (s4 !== peg$FAILED) {
+                s5 = [];
+                if (peg$c65.test(input.charAt(peg$currPos))) {
+                  s6 = input.charAt(peg$currPos);
+                  peg$currPos++;
+                } else {
+                  s6 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                }
+                while (s6 !== peg$FAILED) {
+                  s5.push(s6);
+                  if (peg$c65.test(input.charAt(peg$currPos))) {
+                    s6 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s6 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c66); }
+                  }
+                }
+                if (s5 !== peg$FAILED) {
+                  s4 = [s4, s5];
+                  s3 = s4;
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+              if (s3 === peg$FAILED) {
+                s3 = null;
+              }
+              if (s3 !== peg$FAILED) {
+                peg$savedPos = s0;
+                s1 = peg$c68(s1, s2, s3);
+                s0 = s1;
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+          if (s0 === peg$FAILED) {
+            s0 = peg$currPos;
+            if (input.charCodeAt(peg$currPos) === 34) {
+              s1 = peg$c69;
+              peg$currPos++;
+            } else {
+              s1 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c70); }
+            }
+            if (s1 !== peg$FAILED) {
+              s2 = [];
+              s3 = peg$currPos;
+              if (input.substr(peg$currPos, 2) === peg$c71) {
+                s4 = peg$c71;
+                peg$currPos += 2;
+              } else {
+                s4 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c72); }
+              }
+              if (s4 !== peg$FAILED) {
+                peg$savedPos = s3;
+                s4 = peg$c73();
+              }
+              s3 = s4;
+              if (s3 === peg$FAILED) {
+                s3 = peg$currPos;
+                if (input.charCodeAt(peg$currPos) === 92) {
+                  s4 = peg$c74;
+                  peg$currPos++;
+                } else {
+                  s4 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c75); }
+                }
+                if (s4 !== peg$FAILED) {
+                  if (peg$c76.test(input.charAt(peg$currPos))) {
+                    s5 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s5 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                  }
+                  if (s5 !== peg$FAILED) {
+                    peg$savedPos = s3;
+                    s4 = peg$c78(s5);
+                    s3 = s4;
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                } else {
+                  peg$currPos = s3;
+                  s3 = peg$FAILED;
+                }
+                if (s3 === peg$FAILED) {
+                  if (peg$c76.test(input.charAt(peg$currPos))) {
+                    s3 = input.charAt(peg$currPos);
+                    peg$currPos++;
+                  } else {
+                    s3 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                  }
+                }
+              }
+              while (s3 !== peg$FAILED) {
+                s2.push(s3);
+                s3 = peg$currPos;
+                if (input.substr(peg$currPos, 2) === peg$c71) {
+                  s4 = peg$c71;
+                  peg$currPos += 2;
+                } else {
+                  s4 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c72); }
+                }
+                if (s4 !== peg$FAILED) {
+                  peg$savedPos = s3;
+                  s4 = peg$c73();
+                }
+                s3 = s4;
+                if (s3 === peg$FAILED) {
+                  s3 = peg$currPos;
+                  if (input.charCodeAt(peg$currPos) === 92) {
+                    s4 = peg$c74;
+                    peg$currPos++;
+                  } else {
+                    s4 = peg$FAILED;
+                    if (peg$silentFails === 0) { peg$fail(peg$c75); }
+                  }
+                  if (s4 !== peg$FAILED) {
+                    if (peg$c76.test(input.charAt(peg$currPos))) {
+                      s5 = input.charAt(peg$currPos);
+                      peg$currPos++;
+                    } else {
+                      s5 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                    }
+                    if (s5 !== peg$FAILED) {
+                      peg$savedPos = s3;
+                      s4 = peg$c78(s5);
+                      s3 = s4;
+                    } else {
+                      peg$currPos = s3;
+                      s3 = peg$FAILED;
+                    }
+                  } else {
+                    peg$currPos = s3;
+                    s3 = peg$FAILED;
+                  }
+                  if (s3 === peg$FAILED) {
+                    if (peg$c76.test(input.charAt(peg$currPos))) {
+                      s3 = input.charAt(peg$currPos);
+                      peg$currPos++;
+                    } else {
+                      s3 = peg$FAILED;
+                      if (peg$silentFails === 0) { peg$fail(peg$c77); }
+                    }
+                  }
+                }
+              }
+              if (s2 !== peg$FAILED) {
+                if (input.charCodeAt(peg$currPos) === 34) {
+                  s3 = peg$c69;
+                  peg$currPos++;
+                } else {
+                  s3 = peg$FAILED;
+                  if (peg$silentFails === 0) { peg$fail(peg$c70); }
+                }
+                if (s3 !== peg$FAILED) {
+                  peg$savedPos = s0;
+                  s1 = peg$c79(s2);
+                  s0 = s1;
+                } else {
+                  peg$currPos = s0;
+                  s0 = peg$FAILED;
+                }
+              } else {
+                peg$currPos = s0;
+                s0 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          }
+        }
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c55); }
+      }
+
+      return s0;
+    }
+
+    function peg$parsenode() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 4).toLowerCase() === peg$c80) {
+        s1 = input.substr(peg$currPos, 4);
+        peg$currPos += 4;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c81); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parseedge() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 4).toLowerCase() === peg$c83) {
+        s1 = input.substr(peg$currPos, 4);
+        peg$currPos += 4;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c84); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsegraph() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 5).toLowerCase() === peg$c85) {
+        s1 = input.substr(peg$currPos, 5);
+        peg$currPos += 5;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c86); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsedigraph() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 7).toLowerCase() === peg$c87) {
+        s1 = input.substr(peg$currPos, 7);
+        peg$currPos += 7;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c88); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsesubgraph() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 8).toLowerCase() === peg$c89) {
+        s1 = input.substr(peg$currPos, 8);
+        peg$currPos += 8;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c90); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsestrict() {
+      var s0, s1;
+
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 6).toLowerCase() === peg$c91) {
+        s1 = input.substr(peg$currPos, 6);
+        peg$currPos += 6;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c92); }
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$c82(s1);
+      }
+      s0 = s1;
+
+      return s0;
+    }
+
+    function peg$parsegraphType() {
+      var s0, s1;
+
+      s0 = peg$parsegraph();
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        s1 = peg$parsedigraph();
+        if (s1 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s1 = peg$c93(s1);
+        }
+        s0 = s1;
+      }
+
+      return s0;
+    }
+
+    function peg$parsewhitespace() {
+      var s0, s1;
+
+      peg$silentFails++;
+      s0 = [];
+      if (peg$c95.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c96); }
+      }
+      if (s1 !== peg$FAILED) {
+        while (s1 !== peg$FAILED) {
+          s0.push(s1);
+          if (peg$c95.test(input.charAt(peg$currPos))) {
+            s1 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s1 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c96); }
+          }
+        }
+      } else {
+        s0 = peg$FAILED;
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c94); }
+      }
+
+      return s0;
+    }
+
+    function peg$parsecomment() {
+      var s0, s1, s2, s3, s4, s5;
+
+      peg$silentFails++;
+      s0 = peg$currPos;
+      if (input.substr(peg$currPos, 2) === peg$c98) {
+        s1 = peg$c98;
+        peg$currPos += 2;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c99); }
+      }
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        if (peg$c100.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c101); }
+        }
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$c100.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c101); }
+          }
+        }
+        if (s2 !== peg$FAILED) {
+          s1 = [s1, s2];
+          s0 = s1;
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+      if (s0 === peg$FAILED) {
+        s0 = peg$currPos;
+        if (input.substr(peg$currPos, 2) === peg$c102) {
+          s1 = peg$c102;
+          peg$currPos += 2;
+        } else {
+          s1 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$c103); }
+        }
+        if (s1 !== peg$FAILED) {
+          s2 = [];
+          s3 = peg$currPos;
+          s4 = peg$currPos;
+          peg$silentFails++;
+          if (input.substr(peg$currPos, 2) === peg$c104) {
+            s5 = peg$c104;
+            peg$currPos += 2;
+          } else {
+            s5 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$c105); }
+          }
+          peg$silentFails--;
+          if (s5 === peg$FAILED) {
+            s4 = void 0;
+          } else {
+            peg$currPos = s4;
+            s4 = peg$FAILED;
+          }
+          if (s4 !== peg$FAILED) {
+            if (input.length > peg$currPos) {
+              s5 = input.charAt(peg$currPos);
+              peg$currPos++;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c106); }
+            }
+            if (s5 !== peg$FAILED) {
+              s4 = [s4, s5];
+              s3 = s4;
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+          while (s3 !== peg$FAILED) {
+            s2.push(s3);
+            s3 = peg$currPos;
+            s4 = peg$currPos;
+            peg$silentFails++;
+            if (input.substr(peg$currPos, 2) === peg$c104) {
+              s5 = peg$c104;
+              peg$currPos += 2;
+            } else {
+              s5 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c105); }
+            }
+            peg$silentFails--;
+            if (s5 === peg$FAILED) {
+              s4 = void 0;
+            } else {
+              peg$currPos = s4;
+              s4 = peg$FAILED;
+            }
+            if (s4 !== peg$FAILED) {
+              if (input.length > peg$currPos) {
+                s5 = input.charAt(peg$currPos);
+                peg$currPos++;
+              } else {
+                s5 = peg$FAILED;
+                if (peg$silentFails === 0) { peg$fail(peg$c106); }
+              }
+              if (s5 !== peg$FAILED) {
+                s4 = [s4, s5];
+                s3 = s4;
+              } else {
+                peg$currPos = s3;
+                s3 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s3;
+              s3 = peg$FAILED;
+            }
+          }
+          if (s2 !== peg$FAILED) {
+            if (input.substr(peg$currPos, 2) === peg$c104) {
+              s3 = peg$c104;
+              peg$currPos += 2;
+            } else {
+              s3 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$c105); }
+            }
+            if (s3 !== peg$FAILED) {
+              s1 = [s1, s2, s3];
+              s0 = s1;
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      }
+      peg$silentFails--;
+      if (s0 === peg$FAILED) {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$c97); }
+      }
+
+      return s0;
+    }
+
+    function peg$parse_() {
+      var s0;
+
+      s0 = peg$parsewhitespace();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsecomment();
+      }
+
+      return s0;
+    }
+
+
+      function merge(a, b, key) {
+
+        function x(a) {
+            a.forEach(function (b) {
+                if (!(b[key] in obj)) {
+                    obj[b[key]] = obj[b[key]] || {};
+                    array.push(obj[b[key]]);
+                }
+                Object.keys(b).forEach(function (k) {
+                    obj[b[key]][k] = b[k];
+                });
+            });
+        }
+
+        var array = [],
+            obj = {};
+
+        x(a);
+        x(b);
+        return array;
+      }
+
+      var directed;
+
+
+    peg$result = peg$startRuleFunction();
+
+    if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+      return peg$result;
+    } else {
+      if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+        peg$fail(peg$endExpectation());
+      }
+
+      throw peg$buildStructuredError(
+        peg$maxFailExpected,
+        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+        peg$maxFailPos < input.length
+          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+      );
+    }
+  }
+
+  root.d3dotparser1 = {
+    SyntaxError: peg$SyntaxError,
+    parse:       peg$parse
+  };
+})(this);
diff --git a/src/index.html b/src/index.html
deleted file mode 100644
index fd42613..0000000
--- a/src/index.html
+++ /dev/null
@@ -1,131 +0,0 @@
-  <!DOCTYPE html>
-  <meta charset="utf-8">
-  <style>
-
-  .links path {
-    fill: none;
-    stroke: #666;
-    stroke-width: 1.5px;
-  }
-
-  .nodes circle {
-    fill: #ccc;
-    stroke: #fff;
-    stroke-width: 1.5px;
-  }
-
-  .nodes text {
-    fill: #000;
-    font: 10px sans-serif;
-    pointer-events: none;
-  }
-
-  </style>
-  <svg width="960" height="600"></svg>
-  <script src="https://d3js.org/d3.v4.min.js"></script>
-  <script src="/grammar/dot.js"></script>
-  <script src="/d3-dot-graph.js"></script>
-  <script>
-
-var line = d3.line()
-    .curve(d3.curveCatmullRom.alpha(0.5));
-
-  var svg = d3.select("svg"),
-      width = +svg.attr("width"),
-      height = +svg.attr("height");
-
-  var color = d3.scaleOrdinal(d3.schemeCategory20);
-
-  var simulation = d3.forceSimulation()
-      .force("link", d3.forceLink().distance(100).id(function(d) { return d.id; }))
-      .force("charge", d3.forceManyBody().strength(-10))
-      .force("collide", d3.forceCollide(50))
-      .force("center", d3.forceCenter(width / 2, height / 2));
-
-  d3.dot("summary.dot", function(graph) {
-    //if (error) throw error;
-
-    // build the arrow.
-svg.append("svg:defs").selectAll("marker")
-    .data(["end"])      // Different link/path types can be defined here
-  .enter().append("svg:marker")    // This section adds in the arrows
-    .attr("id", String)
-    .attr("viewBox", "0 -5 10 10")
-    .attr("refX", 15)
-    .attr("refY", -1.5)
-    .attr("markerWidth", 6)
-    .attr("markerHeight", 6)
-    .attr("orient", "auto")
-  .append("svg:path")
-  .attr("d", "M0,-5L10,0L0,5");;
-
-// add the links and the arrows
-var path = svg.append("svg:g").attr("class", "links").selectAll("path")
-    .data(graph.links)
-  .enter().append("svg:path")
-//    .attr("class", function(d) { return "link " + d.type; })
-    .attr("marker-end", "url(#end)");
-
-    var node = svg.append("g")
-        .attr("class", "nodes")
-      .selectAll("circle")
-      .data(graph.nodes)
-      .enter().append("g")
-
-      node
-        .append("circle")
-        .attr("r", 5)
-        //.attr("fill", function(d) { return color(d.group); })
-        .call(d3.drag()
-            .on("start", dragstarted)
-            .on("drag", dragged)
-            .on("end", dragended));
-
-        // add the text
-        node.append("text")
-            .attr("x", 12)
-            .attr("dy", ".35em")
-            .text(function(d) { return d.id; });
-
-    simulation
-        .nodes(graph.nodes)
-        .on("tick", ticked);
-
-    simulation.force("link")
-        .links(graph.links);
-
-    let linkGen = d3.linkVertical().x(function(d) { return d.x; })
-    .y(function(d) { return d.y; });;
-
-    var linkRad = d3.linkRadial()
-        .angle(function(d) { return d.x; })
-        .radius(function(d) { return d.y; });
-
-    function ticked() {
-      path.attr("d",
-      (d)=>linkGen(d))
-      //(d) => line([[d.source.x, d.source.y], [d.target.x, d.target.y]]));
-
-          node
-              .attr("transform", function(d) {
-        	    return "translate(" + d.x + "," + d.y + ")"; });
-    }
-  });
-
-  function dragstarted(d) {
-    if (!d3.event.active) simulation.alphaTarget(0.3).restart();
-    d.fx = d.x;
-    d.fy = d.y;
-  }
-
-  function dragged(d) {
-    d.fx = d3.event.x;
-    d.fy = d3.event.y;
-  }
-
-  function dragended(d) {
-    if (!d3.event.active) simulation.alphaTarget(0);
-    d.fx = null;
-    d.fy = null;
-  }
-</script>
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..2351d77
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,5 @@
+'use strict';
+
+import load from "./load.js";
+
+d3.dot = load;
diff --git a/src/d3-dot-graph.js b/src/load.js
similarity index 85%
rename from src/d3-dot-graph.js
rename to src/load.js
index f49b693..e61e3ee 100644
--- a/src/d3-dot-graph.js
+++ b/src/load.js
@@ -1,11 +1,16 @@
-d3.dot =
-  function(url, converter, callback) {
+'use strict';
+
+import "./dot-parser.js";
+
+const dotparser = d3dotparser1;
+
+export default function(url, converter, callback) {
       if (arguments.length < 3) callback = converter, converter = simple;
       var r = d3
           .request(url)
           .mimeType("text/vnd.graphviz")
           .response(function(xhr) {
-            return converter(d3dot.parse(xhr.responseText)); });
+            return converter(dotparser.parse(xhr.responseText)); });
       return callback ? r.get(callback) : r;
   };