commit 373c245f049896c60c91a829e60e95fff309757f
Author: Sander Hautvast <shautvast@ilionx.com>
Date:   Thu May 17 16:03:44 2018 +0200

    initial

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0196246
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+
+/target/
+**/*.rs.bk
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..2f8f269
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CargoProjects">
+    <cargoProject FILE="$PROJECT_DIR$/Cargo.toml" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_3">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+  <component name="RustProjectSettings">
+    <option name="toolchainHomeDirectory" value="$USER_HOME$/.cargo/bin" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..92ceafd
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/expression_parser.iml" filepath="$PROJECT_DIR$/expression_parser.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..db095f2
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,438 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
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+  <component name="FileEditorManager">
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+  <component name="FindInProjectRecents">
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+      <find>'(</find>
+      <find>self.ch</find>
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+  <component name="IdeDocumentHistory">
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+  <component name="JsBuildToolGruntFileManager" detection-done="true" sorting="DEFINITION_ORDER" />
+  <component name="JsBuildToolPackageJson" detection-done="true" sorting="DEFINITION_ORDER" />
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+    <option name="width" value="1440" />
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+      <showMembers />
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+      <hideEmptyPackages />
+      <abbreviatePackageNames />
+      <autoscrollToSource />
+      <autoscrollFromSource ProjectPane="true" />
+      <sortByType />
+      <manualOrder />
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="PackagesPane" />
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="ExpressionParser" type="b2602c69:ProjectViewProjectNode" />
+              <item name="ExpressionParser" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="ExpressionParser" type="b2602c69:ProjectViewProjectNode" />
+              <item name="ExpressionParser" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
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+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="ENABLE_SWING_INSPECTOR" value="false" />
+      <option name="ENV_VARIABLES" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <module name="" />
+      <envs />
+    </configuration>
+    <configuration name="Run ExpressionParser" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
+      <option name="channel" value="DEFAULT" />
+      <option name="command" value="run --package ExpressionParser --bin ExpressionParser" />
+      <option name="nocapture" value="true" />
+      <option name="backtrace" value="FULL" />
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+      <option name="SERVER_MODE" value="false" />
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+    <states>
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\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a41ce75
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "ExpressionParser"
+version = "0.1.0"
+
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8934ebc
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "ExpressionParser"
+version = "0.1.0"
+authors = ["Sander Hautvast <shautvast@ilionx.com>"]
+
+[dependencies]
diff --git a/expression_parser.iml b/expression_parser.iml
new file mode 100644
index 0000000..7fe828a
--- /dev/null
+++ b/expression_parser.iml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="RUST_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/examples" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/benches" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..30661f8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,113 @@
+use std::iter::Peekable;
+use std::str::Chars;
+
+fn main() {
+    println!("{:?}", parse("1+2*62+sin(90)" ));
+}
+
+pub fn parse(exp: &str) -> f64 {
+    let mut parser = Parser {
+        expr: &mut exp.chars().peekable(),
+    };
+    parser.parse()
+}
+
+struct Parser<'a> {
+    expr: &'a mut Peekable<Chars<'a>>,
+}
+
+impl<'a> Parser<'a> {
+    fn parse(&mut self) -> f64 {
+        self.parse_expression()
+    }
+
+    fn next_char(&mut self) {
+        self.expr.next();
+    }
+
+    fn eat(&mut self, char_to_eat: char) -> bool {
+        while self.peek() == ' ' {
+            self.next_char();
+        }
+        if self.peek() == char_to_eat {
+            self.next_char();
+            return true;
+        }
+        false
+    }
+
+    fn peek(&mut self) -> char{
+        match self.expr.peek() {
+            Some(e) => { *e }
+            None => '\u{0}'
+        }
+    }
+
+    fn parse_expression(&mut self) -> f64 {
+        let mut x = self.parse_term();
+        loop {
+            if self.eat('+') {
+                x += self.parse_term();
+            } else if self.eat('-') {
+                x -= self.parse_term();
+            } else { return x; }
+        }
+    }
+
+    fn parse_term(&mut self) -> f64 {
+        let mut x = self.parse_factor();
+        loop {
+            if self.eat('*') {
+                x *= self.parse_factor();
+            } else if self.eat('/') {
+                x /= self.parse_factor();
+            } else { return x; }
+        }
+    }
+
+    fn parse_factor(&mut self) -> f64 {
+        if self.eat('+') {
+            return self.parse_factor(); // unary plus
+        }
+        if self.eat('-') {
+            return -self.parse_factor(); // unary minus
+        }
+        let mut x: f64;
+
+        if self.eat('(') { // parentheses
+            x = self.parse_expression();
+            self.eat(')');
+        } else if self.peek().is_numeric() || self.peek() == '.' { // numbers
+            let mut buffer = String::new();
+
+            while self.peek().is_numeric() || self.peek() == '.' {
+                buffer.push(self.peek());
+                self.next_char();
+            }
+
+            x = buffer.parse().unwrap();
+        } else if self.peek().is_alphabetic() { // functions
+            let mut func = String::new();
+            while self.peek().is_alphabetic() {
+                func.push(self.peek());
+                self.next_char();
+            }
+
+            x = self.parse_factor();
+            x = match func.as_str(){
+                "sqrt" => x.sqrt(),
+                "sin" => x.to_radians().sin(),
+                "cos" => x.to_radians().cos(),
+                "tan" => x.to_radians().tan(),
+                _ => panic!(format!("Unknown function: {}", func))
+            };
+        } else {
+            panic!(format!("Unexpected: {}", self.peek()));
+        }
+
+        if self.eat('^') {
+            x = x.powf(self.parse_factor()); // exponentiation
+        }
+        x
+    }
+}
\ No newline at end of file