added support for lists (no maps as list elements yet)

src/main/java/nl/sander/jsontoy2/IoReader.java

@@ -1,18 +1,22 @@
 package nl.sander.jsontoy2;
 
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
 import java.nio.ByteBuffer;
+import java.util.*;
 
 public class IoReader {
     private static final int HEX_RADIX = 16;
     private final InputStream inputStream;
     private final ByteBuf characterBuffer = new ByteBuf();
     private final ByteBuf encodedCodePointBuffer = new ByteBuf(4);
+    private final ByteBuffer convertBuffer = ByteBuffer.allocate(4);
     private boolean escaping = false;
     private boolean encoded = false;
-    private final ByteBuffer convertBuffer = ByteBuffer.allocate(4);
     private byte current;
     private int linecount = 0;
+    private long charcount = 0;
 
     protected IoReader(InputStream inputStream) {
         this.inputStream = inputStream;
@@ -55,9 +59,9 @@ public class IoReader {
     }
 
     public Character readCharacter() {
-        eat('\"');
+        eatUntil('\"');
         char currentChar = (char) current;
-        eat('\"');
+        eatUntil('\"');
         return currentChar;
     }
 
@@ -88,9 +92,57 @@ public class IoReader {
         return characterBuffer.toString();
     }
 
+    public List<?> readList() {
+        List<Object> list = new ArrayList<>();
+
+        if (current != '[') {
+            throw new JsonReadException("no list found");
+        }
+        advance();
+        while (current != -1 && current != ']') {
+            Optional<Object> maybeValue = readValue();
+            if (maybeValue.isEmpty()) {
+                break;
+            } else {
+                list.add(maybeValue.get());
+                eatUntilAny(',');
+            }
+        }
+
+        return list;
+    }
+
+    private Optional<Object> readValue() {
+        Object value;
+        skipWhitespace();
+        if (current == ']') {
+            return Optional.empty();
+        } else if (current == '[') {
+            value = readList();
+        } else if (current == '{') {
+            value = readMap();
+        } else if (current == '\"') {
+            value = readString();
+        } else if (current == 'T' || current == 't' || current == 'F' || current == 'f') {
+            value = readBoolean();
+        } else {
+            String numeric = readNumeric();
+            double doubleValue = Double.parseDouble(numeric);
+            if ((int) doubleValue == doubleValue) {
+                value = (int) doubleValue;
+            } else {
+                value = doubleValue;
+            }
+        }
+        return Optional.of(value);
+    }
+
+    private Map<?, ?> readMap() {
+        return new HashMap<>();
+    }
 
     public String readString() {
-        eat('\"');
+        eatUntil('\"');
 
         characterBuffer.clear();
         boolean endOfString = false;
@@ -134,9 +186,6 @@ public class IoReader {
             }
             advance();
         }
-        if (current != -1) {
-            advance();
-        }
 
         return characterBuffer.toString();
     }
@@ -151,7 +200,8 @@ public class IoReader {
 
     void advance() {
         try {
-            current = (byte)inputStream.read();
+            current = (byte) inputStream.read();
+            System.out.println((charcount++) + ":" + (char) current);
         } catch (IOException e) {
             throw new IllegalStateException(e);
         }
@@ -160,7 +210,7 @@ public class IoReader {
     void skipWhitespace() {
         try {
             while (current > -1 && Character.isWhitespace(current)) {
-                current = (byte)inputStream.read();
+                current = (byte) inputStream.read();
             }
             if (current == -1) {
                 throw new JsonReadException("end of source reached");
@@ -170,7 +220,7 @@ public class IoReader {
         }
     }
 
-    String eat(char until) {
+    String eatUntil(char until) {
         characterBuffer.clear();
 
         while (current > -1 && (current != until | Character.isWhitespace(current))) {
@@ -180,4 +230,24 @@ public class IoReader {
         advance();
         return characterBuffer.toString();
     }
+
+    String eatUntilAny(char... untilOrrChars) {
+        characterBuffer.clear();
+
+        while (current > -1 && (!contains(untilOrrChars, current) | Character.isWhitespace(current))) {
+            characterBuffer.add(current);
+            advance();
+        }
+        advance();
+        return characterBuffer.toString();
+    }
+
+    private boolean contains(char[] chars, byte search) {
+        for (char aChar : chars) {
+            if (search == aChar) {
+                return true;
+            }
+        }
+        return false;
+    }
 }

src/main/java/nl/sander/jsontoy2/JsonReader.java

@@ -5,6 +5,7 @@ import nl.sander.jsontoy2.readers.*;
 import java.io.InputStream;
 import java.time.LocalDateTime;
 import java.util.Date;
+import java.util.List;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
@@ -32,7 +33,7 @@ public class JsonReader {
         return readers.get(type);
     }
 
-    public static <T> void register(Class<T> type, JsonObjectReader<T> objectReader) {
+    static <T> void register(Class<T> type, JsonObjectReader<T> objectReader) {
         readers.put(type, objectReader);
     }
 
@@ -56,5 +57,6 @@ public class JsonReader {
         register(char.class, new CharReader());
         register(String.class, new StringReader());
         register(LocalDateTime.class, new LocalDateTimeReader());
+        register(List.class, new ListReader());
     }
 }

src/main/java/nl/sander/jsontoy2/readers/ListReader.java

@@ -0,0 +1,14 @@
+package nl.sander.jsontoy2.readers;
+
+import nl.sander.jsontoy2.IoReader;
+import nl.sander.jsontoy2.JsonObjectReader;
+
+import java.util.List;
+
+@SuppressWarnings("rawtypes")
+public class ListReader implements JsonObjectReader<List> {
+    @Override
+    public List<?> read(IoReader ioReader) {
+        return ioReader.readList();
+    }
+}

src/test/java/nl/sander/jsontoy2/Lists.java

@@ -0,0 +1,68 @@
+package nl.sander.jsontoy2;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@SuppressWarnings("unchecked")
+public class Lists {
+
+    @Test
+    public void emptyList() {
+        List<String> list = JsonReader.read(List.class, "[]");
+        assertEquals(new ArrayList<>(), list);
+    }
+
+    @Test
+    public void singleStringList() {
+        List<String> list = JsonReader.read(List.class, "[\"hello jason\"]");
+        assertEquals(Collections.singletonList("hello jason"), list);
+    }
+
+    @Test
+    public void multipleStringList() {
+        List<String> list = JsonReader.read(List.class, "[\"hello\" , \"jason\"]");
+        List<String> expected = Arrays.asList("hello", "jason");
+        assertEquals(expected, list);
+    }
+
+    @Test
+    public void multipleStrings_noComma_error() {
+        List<String> list = JsonReader.read(List.class, "[\"hello\" \"jason\"]");
+        List<String> expected = Collections.singletonList("hello");
+        assertEquals(expected, list);
+    }
+
+    @Test
+    public void singleInt() {
+        List<Integer> list = JsonReader.read(List.class, "[1]");
+        List<Integer> expected = Collections.singletonList(1);
+        assertEquals(expected, list);
+    }
+
+    @Test
+    public void multipleInts() {
+        List<Integer> list = JsonReader.read(List.class, "[1,2]");
+        List<Integer> expected = Arrays.asList(1,2);
+        assertEquals(expected, list);
+    }
+
+    @Test
+    public void intDoubleBooleanString() {
+        List<Integer> list = JsonReader.read(List.class, "[1,2.5,false,\"hello jason\"]");
+        List<?> expected = Arrays.asList(1,2.5,false,"hello jason");
+        assertEquals(expected, list);
+    }
+
+    @Test
+    public void nestedList() {
+        List<Integer> list = JsonReader.read(List.class, "[[],[]]");
+        List<?> expected = Arrays.asList(List.of(), List.of());
+        assertEquals(expected, list);
+    }
+}