merging the range-killer to master

2026-02-18 03:21:20 -05:00 · 2010-10-21 21:27:45 -04:00
parent 341de42692 79148d2940
commit 0342b0a89f
23 changed files with 639 additions and 1035 deletions
--- a/4
+++ b/4
@@ -99,8 +99,8 @@ task 'loc', 'count the lines of source code in the CoffeeScript compiler', ->
 runTests = (CoffeeScript) ->
  startTime = Date.now()
  passedTests = failedTests = 0
-  for all name, func of require 'assert'
+  wrap = (name, func) -> global[name] = -> ++passedTests; func arguments...
-    global[name] = -> ++passedTests; func arguments...
+  wrap name, func for all name, func of require 'assert'
  global.eq = global.strictEqual
  global.CoffeeScript = CoffeeScript
  process.on 'exit', ->
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -25,16 +25,16 @@
    return xhr.send(null);
  };
  runScripts = function() {
-    var _i, _j, _len, _ref, script;
+    var _i, _len, _ref, script;
-    for (_i = 0, _len = (_ref = document.getElementsByTagName('script')).length; _i < _len; _i++) {
+    for (_i = 0, _len = (_ref = document.getElementsByTagName('script')).length; _i < _len; ++_i) {
-      (function() {
+      script = _ref[_i];
-        var script = _ref[_i];
+      if (script.type === 'text/coffeescript') {
-        _j = script;
+        if (script.src) {
-        return script.type === 'text/coffeescript' ? script.src ? CoffeeScript.load(script.src) : setTimeout(function() {
+          CoffeeScript.load(script.src);
-          return CoffeeScript.run(script.innerHTML);
+        } else {
-        }) : undefined;
+          CoffeeScript.run(script.innerHTML);
-      })();
+        }
-      script = _j;
+      }
    }
    return null;
  };
--- a/lib/cake.js
+++ b/lib/cake.js
@@ -47,7 +47,7 @@
      }
      options = oparse.parse(args);
      _result = [];
-      for (_i = 0, _len = (_ref = options.arguments).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref = options.arguments).length; _i < _len; ++_i) {
        arg = _ref[_i];
        _result.push(invoke(arg));
      }
--- a/lib/command.js
+++ b/lib/command.js
@@ -48,43 +48,39 @@
    return compileScripts();
  };
  compileScripts = function() {
-    var _i, _j, _len, _ref2, _result, base, compile, source;
+    var _i, _len, _ref2, _result, base, compile, source;
    _result = [];
-    for (_i = 0, _len = (_ref2 = sources).length; _i < _len; _i++) {
+    for (_i = 0, _len = (_ref2 = sources).length; _i < _len; ++_i) {
-      (function() {
+      source = _ref2[_i];
-        var source = _ref2[_i];
+      _result.push((function() {
-        _j = source;
+        base = path.join(source);
-        return _result.push((function() {
+        compile = function(source, topLevel) {
-          base = path.join(source);
+          return path.exists(source, function(exists) {
-          compile = function(source, topLevel) {
+            if (!exists) {
-            return path.exists(source, function(exists) {
+              throw new Error("File not found: " + source);
-              if (!exists) {
+            }
-                throw new Error("File not found: " + source);
+            return fs.stat(source, function(err, stats) {
              if (stats.isDirectory()) {
                return fs.readdir(source, function(err, files) {
                  var _j, _len2, _result2, file;
                  _result2 = [];
                  for (_j = 0, _len2 = files.length; _j < _len2; ++_j) {
                    file = files[_j];
                    _result2.push(compile(path.join(source, file)));
                  }
                  return _result2;
                });
              } else if (topLevel || path.extname(source) === '.coffee') {
                fs.readFile(source, function(err, code) {
                  return compileScript(source, code.toString(), base);
                });
                return opts.watch ? watch(source, base) : undefined;
              }
              return fs.stat(source, function(err, stats) {
                if (stats.isDirectory()) {
                  return fs.readdir(source, function(err, files) {
                    var _k, _len2, _result2, file;
                    _result2 = [];
                    for (_k = 0, _len2 = files.length; _k < _len2; _k++) {
                      file = files[_k];
                      _result2.push(compile(path.join(source, file)));
                    }
                    return _result2;
                  });
                } else if (topLevel || path.extname(source) === '.coffee') {
                  fs.readFile(source, function(err, code) {
                    return compileScript(source, code.toString(), base);
                  });
                  return opts.watch ? watch(source, base) : undefined;
                }
              });
            });
-          };
+          });
-          return compile(source, true);
+        };
-        })());
+        return compile(source, true);
-      })();
+      })());
      source = _j;
    }
    return _result;
  };
@@ -93,7 +89,7 @@
    o = opts;
    options = compileOptions(file);
    if (o.require) {
-      for (_i = 0, _len = (_ref2 = o.require).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = o.require).length; _i < _len; ++_i) {
        req = _ref2[_i];
        require(helpers.starts(req, '.') ? fs.realpathSync(req) : req);
      }
@@ -190,7 +186,7 @@
    var _i, _len, _ref2, _result, strings, tag, token, value;
    strings = (function() {
      _result = [];
-      for (_i = 0, _len = tokens.length; _i < _len; _i++) {
+      for (_i = 0, _len = tokens.length; _i < _len; ++_i) {
        token = tokens[_i];
        _result.push((function() {
          _ref2 = [token[0], token[1].toString().replace(/\n/, '\\n')], tag = _ref2[0], value = _ref2[1];
--- a/lib/grammar.js
+++ b/lib/grammar.js
@@ -1,6 +1,5 @@
 (function() {
  var Parser, _i, _j, _len, _len2, _ref, _result, alt, alternatives, grammar, name, o, operators, token, tokens, unwrap;
  var __hasProp = Object.prototype.hasOwnProperty;
  Parser = require('jison').Parser;
  unwrap = /^function\s*\(\)\s*\{\s*return\s*([\s\S]*);\s*\}/;
  o = function(patternString, action, options) {
@@ -11,7 +10,7 @@
    }
    action = (match = unwrap.exec(action)) ? match[1] : "(" + action + "())";
    action = action.replace(/\bnew /g, '$&yy.');
-    action = action.replace(/\bExpressions\.wrap\b/g, 'yy.$&');
+    action = action.replace(/\b(?:Expressions\.wrap|extend)\b/g, 'yy.$&');
    return [patternString, "$$ = " + action + ";", options];
  };
  grammar = {
@@ -78,17 +77,17 @@
      })
    ],
    AssignObj: [
-      o("Identifier", function() {
+      o('Identifier', function() {
        return new Value($1);
-      }), o("AlphaNumeric"), o("ThisProperty"), o("Identifier   : Expression", function() {
+      }), o('AlphaNumeric'), o('ThisProperty'), o('Identifier   : Expression', function() {
        return new Assign(new Value($1), $3, 'object');
-      }), o("AlphaNumeric : Expression", function() {
+      }), o('AlphaNumeric : Expression', function() {
        return new Assign(new Value($1), $3, 'object');
-      }), o("Identifier   : INDENT Expression OUTDENT", function() {
+      }), o('Identifier   : INDENT Expression OUTDENT', function() {
        return new Assign(new Value($1), $4, 'object');
-      }), o("AlphaNumeric : INDENT Expression OUTDENT", function() {
+      }), o('AlphaNumeric : INDENT Expression OUTDENT', function() {
        return new Assign(new Value($1), $4, 'object');
-      }), o("Comment")
+      }), o('Comment')
    ],
    Return: [
      o("RETURN Expression", function() {
@@ -168,8 +167,6 @@
        return new Value($1);
      }), o("Parenthetical", function() {
        return new Value($1);
      }), o("Range", function() {
        return new Value($1);
      }), o("This")
    ],
    Accessor: [
@@ -188,12 +185,14 @@
    Index: [
      o("INDEX_START Expression INDEX_END", function() {
        return new Index($2);
-      }), o("INDEX_SOAK Index", function() {
+      }), o("INDEX_SOAK  Index", function() {
-        $2.soakNode = true;
+        return extend($2, {
-        return $2;
+          soakNode: true
        });
      }), o("INDEX_PROTO Index", function() {
-        $2.proto = true;
+        return extend($2, {
-        return $2;
+          proto: true
        });
      })
    ],
    Object: [
@@ -290,32 +289,11 @@
        return new Value(new Literal('this'));
      })
    ],
    RangeDots: [
      o("..", function() {
        return 'inclusive';
      }), o("...", function() {
        return 'exclusive';
      })
    ],
    ThisProperty: [
      o("@ Identifier", function() {
        return new Value(new Literal('this'), [new Accessor($2)], 'this');
      })
    ],
    Range: [
      o("[ Expression RangeDots Expression ]", function() {
        return new Range($2, $4, $3);
      })
    ],
    Slice: [
      o("INDEX_START Expression RangeDots Expression INDEX_END", function() {
        return new Range($2, $4, $3);
      }), o("INDEX_START Expression RangeDots INDEX_END", function() {
        return new Range($2, null, $3);
      }), o("INDEX_START RangeDots Expression INDEX_END", function() {
        return new Range(null, $3, $2);
      })
    ],
    Array: [
      o("[ ]", function() {
        return new ArrayLiteral([]);
@@ -405,81 +383,37 @@
      })
    ],
    For: [
-      o("Statement ForBody", function() {
+      o('Statement  ForBody', function() {
-        return new For($1, $2, $2.vars[0], $2.vars[1]);
+        return new For($1, $2);
-      }), o("Expression ForBody", function() {
+      }), o('Expression ForBody', function() {
-        return new For($1, $2, $2.vars[0], $2.vars[1]);
+        return new For($1, $2);
-      }), o("ForBody Block", function() {
+      }), o('ForBody    Block', function() {
-        return new For($2, $1, $1.vars[0], $1.vars[1]);
+        return new For($2, $1);
      })
    ],
    ForBody: [
      o("FOR Range", function() {
        return {
          source: new Value($2),
          vars: []
        };
      }), o("ForStart ForSource", function() {
        $2.raw = $1.raw;
        $2.vars = $1;
        return $2;
      })
    ],
    ForStart: [
      o("FOR ForVariables", function() {
        return $2;
      }), o("FOR ALL ForVariables", function() {
        $3.raw = true;
        return $3;
      })
    ],
    ForValue: [
-      o("Identifier"), o("Array", function() {
+      o('Identifier'), o('Array', function() {
        return new Value($1);
-      }), o("Object", function() {
+      }), o('Object', function() {
        return new Value($1);
      })
    ],
-    ForVariables: [
+    ForIn: [
-      o("ForValue", function() {
+      o('FORIN Expression', function() {
        return [$1];
      }), o("ForValue , ForValue", function() {
        return [$1, $3];
      })
    ],
    ForSource: [
      o("FORIN Expression", function() {
        return {
          source: $2
        };
-      }), o("FOROF Expression", function() {
+      }), o('FORIN Expression WHEN Expression', function() {
        return {
          source: $2,
          object: true
        };
      }), o("FORIN Expression WHEN Expression", function() {
        return {
          source: $2,
          guard: $4
        };
-      }), o("FOROF Expression WHEN Expression", function() {
+      }), o('FORIN Expression BY Expression', function() {
        return {
          source: $2,
          guard: $4,
          object: true
        };
      }), o("FORIN Expression BY Expression", function() {
        return {
          source: $2,
          step: $4
        };
-      }), o("FORIN Expression WHEN Expression BY Expression", function() {
+      }), o('FORIN Expression BY Expression WHEN Expression', function() {
        return {
          source: $2,
          guard: $4,
          step: $6
        };
      }), o("FORIN Expression BY Expression WHEN Expression", function() {
        return {
          source: $2,
          step: $4,
@@ -487,6 +421,80 @@
        };
      })
    ],
    ForOf: [
      o('FOROF Expression', function() {
        return {
          object: true,
          source: $2
        };
      }), o('FOROF Expression WHEN Expression', function() {
        return {
          object: true,
          source: $2,
          guard: $4
        };
      })
    ],
    ForTo: [
      o('TO Expression', function() {
        return {
          to: $2
        };
      }), o('TO Expression WHEN Expression', function() {
        return {
          to: $2,
          guard: $4
        };
      }), o('TO Expression BY Expression', function() {
        return {
          to: $2,
          step: $4
        };
      }), o('TO Expression BY Expression WHEN Expression', function() {
        return {
          to: $2,
          step: $4,
          guard: $6
        };
      })
    ],
    ForBody: [
      o('FOR ForValue ForIn', function() {
        return extend($3, {
          name: $2
        });
      }), o('FOR ForValue , Identifier ForIn', function() {
        return extend($5, {
          name: $2,
          index: $4
        });
      }), o('FOR Identifier ForOf', function() {
        return extend($3, {
          index: $2
        });
      }), o('FOR ForValue , ForValue ForOf', function() {
        return extend($5, {
          index: $2,
          name: $4
        });
      }), o('FOR ALL Identifier ForOf', function() {
        return extend($4, {
          raw: true,
          index: $3
        });
      }), o('FOR ALL Identifier , ForValue ForOf', function() {
        return extend($6, {
          raw: true,
          index: $3,
          name: $5
        });
      }), o('FOR Identifier FROM Expression ForTo', function() {
        return extend($5, {
          index: $2,
          from: $4
        });
      })
    ],
    Switch: [
      o("SWITCH Expression INDENT Whens OUTDENT", function() {
        return new Switch($2, $4);
@@ -588,17 +596,16 @@
      })
    ]
  };
-  operators = [["left", 'CALL_START', 'CALL_END'], ["nonassoc", '++', '--'], ["left", '?'], ["right", 'UNARY'], ["left", 'MATH'], ["left", '+', '-'], ["left", 'SHIFT'], ["left", 'COMPARE'], ["left", 'RELATION'], ["left", '==', '!='], ["left", 'LOGIC'], ["left", '.'], ["nonassoc", 'INDENT', 'OUTDENT'], ["right", 'WHEN', 'LEADING_WHEN', 'FORIN', 'FOROF', 'BY', 'THROW'], ["right", 'IF', 'UNLESS', 'ELSE', 'FOR', 'WHILE', 'UNTIL', 'LOOP', 'SUPER', 'CLASS', 'EXTENDS'], ["right", '=', ':', 'COMPOUND_ASSIGN', 'RETURN'], ["right", '->', '=>', 'UNLESS', 'POST_IF', 'POST_UNLESS']];
+  operators = [["left", 'CALL_START', 'CALL_END'], ["nonassoc", '++', '--'], ["left", '?'], ["right", 'UNARY'], ["left", 'MATH'], ["left", '+', '-'], ["left", 'SHIFT'], ["left", 'COMPARE'], ["left", 'RELATION'], ["left", '==', '!='], ["left", 'LOGIC'], ["left", '.'], ["nonassoc", 'INDENT', 'OUTDENT'], ["right", 'WHEN', 'LEADING_WHEN', 'FORIN', 'FOROF', 'FROM', 'TO', 'BY', 'THROW'], ["right", 'IF', 'UNLESS', 'ELSE', 'FOR', 'WHILE', 'UNTIL', 'LOOP', 'SUPER', 'CLASS', 'EXTENDS'], ["right", '=', ':', 'COMPOUND_ASSIGN', 'RETURN'], ["right", '->', '=>', 'UNLESS', 'POST_IF', 'POST_UNLESS']];
  tokens = [];
  for (name in grammar) {
    if (!__hasProp.call(grammar, name)) continue;
    alternatives = grammar[name];
    grammar[name] = (function() {
      _result = [];
-      for (_i = 0, _len = alternatives.length; _i < _len; _i++) {
+      for (_i = 0, _len = alternatives.length; _i < _len; ++_i) {
        alt = alternatives[_i];
        _result.push((function() {
-          for (_j = 0, _len2 = (_ref = alt[0].split(' ')).length; _j < _len2; _j++) {
+          for (_j = 0, _len2 = (_ref = alt[0].split(' ')).length; _j < _len2; ++_j) {
            token = _ref[_j];
            if (!grammar[token]) {
              tokens.push(token);
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -11,7 +11,7 @@
  exports.compact = function(array) {
    var _i, _len, _result, item;
    _result = [];
-    for (_i = 0, _len = array.length; _i < _len; _i++) {
+    for (_i = 0, _len = array.length; _i < _len; ++_i) {
      item = array[_i];
      if (item) {
        _result.push(item);
@@ -41,7 +41,7 @@
  exports.flatten = flatten = function(array) {
    var _i, _len, element, flattened;
    flattened = [];
-    for (_i = 0, _len = array.length; _i < _len; _i++) {
+    for (_i = 0, _len = array.length; _i < _len; ++_i) {
      element = array[_i];
      if (element instanceof Array) {
        flattened = flattened.concat(flatten(element));
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -23,9 +23,9 @@
      this.indent = 0;
      this.indebt = 0;
      this.outdebt = 0;
      this.seenFor = false;
      this.indents = [];
      this.tokens = [];
      this.seenFor = this.seenFrom = false;
      while (this.chunk = code.slice(this.i)) {
        this.identifierToken() || this.commentToken() || this.whitespaceToken() || this.lineToken() || this.heredocToken() || this.stringToken() || this.numberToken() || this.regexToken() || this.jsToken() || this.literalToken();
      }
@@ -46,6 +46,17 @@
        this.token('ALL', id);
        return true;
      }
      if (id === 'from' && this.tag(1) === 'FOR') {
        this.seenFor = false;
        this.seenFrom = true;
        this.token('FROM', id);
        return true;
      }
      if (id === 'to' && this.seenFrom) {
        this.seenFrom = false;
        this.token('TO', id);
        return true;
      }
      forcedIdentifier = colon || this.tagAccessor();
      tag = 'IDENTIFIER';
      if (__indexOf.call(JS_KEYWORDS, id) >= 0 || !forcedIdentifier && __indexOf.call(COFFEE_KEYWORDS, id) >= 0) {
@@ -217,7 +228,7 @@
      tokens = [];
      for (_i = 0, _len = (_ref2 = this.interpolateString(body, {
        regex: true
-      })).length; _i < _len; _i++) {
+      })).length; _i < _len; ++_i) {
        _ref3 = _ref2[_i], tag = _ref3[0], value = _ref3[1];
        if (tag === 'TOKENS') {
          tokens.push.apply(tokens, value);
@@ -469,7 +480,7 @@
        if (levels.length && str.charAt(i) === '\\') {
          i += 1;
        } else {
-          for (_i = 0, _len = delimited.length; _i < _len; _i++) {
+          for (_i = 0, _len = delimited.length; _i < _len; ++_i) {
            pair = delimited[_i];
            open = pair[0], close = pair[1];
            if (levels.length && starts(str, close, i) && last(levels) === pair) {
@@ -495,7 +506,7 @@
      if (levels.length) {
        throw SyntaxError("Unterminated " + (levels.pop()[0]) + " starting on line " + (this.line + 1));
      }
-      return !i ? false : str.slice(0, i);
+      return i && str.slice(0, i);
    };
    Lexer.prototype.interpolateString = function(str, options) {
      var _len, _ref2, _ref3, _this, expr, heredoc, i, inner, interpolated, letter, nested, pi, regex, tag, tokens, value;
@@ -545,7 +556,7 @@
      if (interpolated = tokens.length > 1) {
        this.token('(', '(');
      }
-      for (i = 0, _len = tokens.length; i < _len; i++) {
+      for (i = 0, _len = tokens.length; i < _len; ++i) {
        _ref3 = tokens[i], tag = _ref3[0], value = _ref3[1];
        if (i) {
          this.token('+', '+');
@@ -611,7 +622,7 @@
  IDENTIFIER = /^([$A-Za-z_][$\w]*)([^\n\S]*:(?!:))?/;
  NUMBER = /^0x[\da-f]+|^(?:\d+(\.\d+)?|\.\d+)(?:e[+-]?\d+)?/i;
  HEREDOC = /^("""|''')([\s\S]*?)(?:\n[ \t]*)?\1/;
-  OPERATOR = /^(?:-[-=>]?|\+[+=]?|\.\.\.?|[*&|\/%=<>^:!?]+)/;
+  OPERATOR = /^(?:-[-=>]?|\+[+=]?|\.{3}|[*&|\/%=<>^:!?]+)/;
  WHITESPACE = /^[ \t]+/;
  COMMENT = /^###([^#][\s\S]*?)(?:###[ \t]*\n|(?:###)?$)|^(?:\s*#(?!##[^#]).*)+/;
  CODE = /^[-=]>/;
@@ -625,7 +636,7 @@
  HEREDOC_INDENT = /\n+([ \t]*)/g;
  ASSIGNED = /^\s*@?[$A-Za-z_][$\w]*[ \t]*?[:=][^:=>]/;
  NEXT_CHARACTER = /^\s*(\S?)/;
-  NEXT_ELLIPSIS = /^\s*\.\.\.?/;
+  NEXT_ELLIPSIS = /^\s*\.{3}/;
  LEADING_SPACES = /^\s+/;
  TRAILING_SPACES = /\s+$/;
  NO_NEWLINE = /^(?:[-+*&|\/%=<>!.\\][<>=&|]*|and|or|is(?:nt)?|n(?:ot|ew)|delete|typeof|instanceof)$/;
--- a/lib/nodes.js
+++ b/lib/nodes.js
@@ -1,5 +1,5 @@
 (function() {
-  var Accessor, ArrayLiteral, Assign, Base, Call, Class, Closure, Code, Comment, Existence, Expressions, Extends, For, IDENTIFIER, IS_STRING, If, In, Index, Literal, NO, NUMBER, ObjectLiteral, Op, Param, Parens, Push, Range, Return, SIMPLENUM, Scope, Slice, Splat, Switch, TAB, THIS, TRAILING_WHITESPACE, Throw, Try, UTILITIES, Value, While, YES, _ref, compact, del, ends, flatten, last, merge, starts, utility;
+  var Accessor, ArrayLiteral, Assign, Base, Call, Class, Closure, Code, Comment, Existence, Expressions, Extends, For, IDENTIFIER, IS_STRING, If, In, Index, Literal, NO, NUMBER, ObjectLiteral, Op, Param, Parens, Push, Return, SIMPLENUM, Scope, Splat, Switch, TAB, THIS, TRAILING_WHITESPACE, Throw, Try, UTILITIES, Value, While, YES, _ref, compact, del, ends, extend, flatten, last, merge, starts, utility;
  var __extends = function(child, parent) {
    function ctor() { this.constructor = child; }
    ctor.prototype = parent.prototype;
@@ -11,7 +11,8 @@
    return -1;
  };
  Scope = require('./scope').Scope;
-  _ref = require('./helpers'), compact = _ref.compact, flatten = _ref.flatten, merge = _ref.merge, del = _ref.del, starts = _ref.starts, ends = _ref.ends, last = _ref.last;
+  _ref = require('./helpers'), compact = _ref.compact, flatten = _ref.flatten, extend = _ref.extend, merge = _ref.merge, del = _ref.del, starts = _ref.starts, ends = _ref.ends, last = _ref.last;
  exports.extend = extend;
  YES = function() {
    return true;
  };
@@ -57,7 +58,7 @@
        }
      }).call(this);
      if ((options != null) ? options.precompile : undefined) {
-        for (i = 0, _len = pair.length; i < _len; i++) {
+        for (i = 0, _len = pair.length; i < _len; ++i) {
          node = pair[i];
          (pair[i] = node.compile(o));
        }
@@ -68,6 +69,16 @@
      this.parenthetical = true;
      return this.compile(o);
    };
    Base.prototype.compileLoopReference = function(o, name) {
      var src, tmp;
      src = tmp = this.compile(o);
      if (!(NUMBER.test(src) || IDENTIFIER.test(src) && o.scope.check(src, {
        immediate: true
      }))) {
        src = "" + (tmp = o.scope.freeVariable(name)) + " = " + src;
      }
      return [src, tmp];
    };
    Base.prototype.idt = function(tabs) {
      return (this.tab || '') + Array((tabs || 0) + 1).join(TAB);
    };
@@ -103,7 +114,7 @@
      idt || (idt = '');
      children = (function() {
        _result = [];
-        for (_i = 0, _len = (_ref2 = this.collectChildren()).length; _i < _len; _i++) {
+        for (_i = 0, _len = (_ref2 = this.collectChildren()).length; _i < _len; ++_i) {
          child = _ref2[_i];
          _result.push(child.toString(idt + TAB));
        }
@@ -117,10 +128,10 @@
      if (!this.children) {
        return;
      }
-      for (_i = 0, _len = (_ref2 = this.children).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.children).length; _i < _len; ++_i) {
        attr = _ref2[_i];
        if (this[attr]) {
-          for (_j = 0, _len2 = (_ref3 = flatten([this[attr]])).length; _j < _len2; _j++) {
+          for (_j = 0, _len2 = (_ref3 = flatten([this[attr]])).length; _j < _len2; ++_j) {
            child = _ref3[_j];
            if (func(child) === false) {
              return;
@@ -205,7 +216,7 @@
      var _i, _len, _ref2, _result, node;
      return (function() {
        _result = [];
-        for (_i = 0, _len = (_ref2 = this.expressions).length; _i < _len; _i++) {
+        for (_i = 0, _len = (_ref2 = this.expressions).length; _i < _len; ++_i) {
          node = _ref2[_i];
          _result.push(this.compileExpression(node, merge(o)));
        }
@@ -348,15 +359,12 @@
    Value.prototype.isObject = function() {
      return this.base instanceof ObjectLiteral && !this.properties.length;
    };
    Value.prototype.isSplice = function() {
      return last(this.properties) instanceof Slice;
    };
    Value.prototype.isComplex = function() {
      return this.base.isComplex() || this.hasProperties();
    };
    Value.prototype.isAtomic = function() {
      var _i, _len, _ref2, node;
-      for (_i = 0, _len = (_ref2 = this.properties.concat(this.base)).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.properties.concat(this.base)).length; _i < _len; ++_i) {
        node = _ref2[_i];
        if (node.soakNode || node instanceof Call) {
          return false;
@@ -417,7 +425,7 @@
      if (props[0] instanceof Accessor && this.isSimpleNumber()) {
        code = "(" + code + ")";
      }
-      for (_i = 0, _len = props.length; _i < _len; _i++) {
+      for (_i = 0, _len = props.length; _i < _len; ++_i) {
        prop = props[_i];
        (code += prop.compile(o));
      }
@@ -429,7 +437,7 @@
        Array.prototype.push.apply(ifn.body.properties, this.properties);
        return ifn;
      }
-      for (i = 0, _len = (_ref2 = this.properties).length; i < _len; i++) {
+      for (i = 0, _len = (_ref2 = this.properties).length; i < _len; ++i) {
        prop = _ref2[i];
        if (prop.soakNode) {
          prop.soakNode = false;
@@ -544,7 +552,7 @@
          break;
        }
      }
-      for (_i = 0, _len = (_ref3 = list.reverse()).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref3 = list.reverse()).length; _i < _len; ++_i) {
        call = _ref3[_i];
        if (ifn) {
          if (call.variable instanceof Call) {
@@ -563,7 +571,7 @@
        return ifn.compile(o);
      }
      ((_ref2 = this.variable) != null) ? _ref2.tags.front = this.tags.front : undefined;
-      for (_i = 0, _len = (_ref3 = this.args).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref3 = this.args).length; _i < _len; ++_i) {
        arg = _ref3[_i];
        if (arg instanceof Splat) {
          return this.compileSplat(o);
@@ -571,7 +579,7 @@
      }
      args = (function() {
        _result = [];
-        for (_j = 0, _len2 = (_ref4 = this.args).length; _j < _len2; _j++) {
+        for (_j = 0, _len2 = (_ref4 = this.args).length; _j < _len2; ++_j) {
          arg = _ref4[_j];
          _result.push(arg.compileBare(o));
        }
@@ -663,117 +671,6 @@
    };
    return Index;
  })();
  exports.Range = (function() {
    Range = (function() {
      function Range(_arg, _arg2, tag) {
        this.to = _arg2;
        this.from = _arg;
        Range.__super__.constructor.call(this);
        this.exclusive = tag === 'exclusive';
        this.equals = this.exclusive ? '' : '=';
        return this;
      };
      return Range;
    })();
    __extends(Range, Base);
    Range.prototype.children = ['from', 'to'];
    Range.prototype.compileVariables = function(o) {
      var _ref2, _ref3, _ref4, parts;
      o = merge(o, {
        top: true
      });
      _ref2 = this.from.compileReference(o, {
        precompile: true
      }), this.from = _ref2[0], this.fromVar = _ref2[1];
      _ref3 = this.to.compileReference(o, {
        precompile: true
      }), this.to = _ref3[0], this.toVar = _ref3[1];
      _ref4 = [this.fromVar.match(SIMPLENUM), this.toVar.match(SIMPLENUM)], this.fromNum = _ref4[0], this.toNum = _ref4[1];
      parts = [];
      if (this.from !== this.fromVar) {
        parts.push(this.from);
      }
      return this.to !== this.toVar ? parts.push(this.to) : undefined;
    };
    Range.prototype.compileNode = function(o) {
      var compare, idx, incr, intro, step, stepPart, vars;
      this.compileVariables(o);
      if (!o.index) {
        return this.compileArray(o);
      }
      if (this.fromNum && this.toNum) {
        return this.compileSimple(o);
      }
      idx = del(o, 'index');
      step = del(o, 'step');
      vars = ("" + idx + " = " + this.from) + (this.to !== this.toVar ? ", " + this.to : '');
      intro = "(" + this.fromVar + " <= " + this.toVar + " ? " + idx;
      compare = "" + intro + " <" + this.equals + " " + this.toVar + " : " + idx + " >" + this.equals + " " + this.toVar + ")";
      stepPart = step ? step.compile(o) : '1';
      incr = step ? "" + idx + " += " + stepPart : "" + intro + " += " + stepPart + " : " + idx + " -= " + stepPart + ")";
      return "" + vars + "; " + compare + "; " + incr;
    };
    Range.prototype.compileSimple = function(o) {
      var _ref2, from, idx, step, to;
      _ref2 = [+this.fromNum, +this.toNum], from = _ref2[0], to = _ref2[1];
      idx = del(o, 'index');
      step = del(o, 'step');
      step && (step = "" + idx + " += " + (step.compile(o)));
      return from <= to ? "" + idx + " = " + from + "; " + idx + " <" + this.equals + " " + to + "; " + (step || ("" + idx + "++")) : "" + idx + " = " + from + "; " + idx + " >" + this.equals + " " + to + "; " + (step || ("" + idx + "--"));
    };
    Range.prototype.compileArray = function(o) {
      var _i, _ref2, _ref3, _result, body, clause, i, idt, post, pre, range, result, vars;
      if (this.fromNum && this.toNum && Math.abs(this.fromNum - this.toNum) <= 20) {
        range = (function() {
          _result = [];
          for (var _i = _ref2 = +this.fromNum, _ref3 = +this.toNum; _ref2 <= _ref3 ? _i <= _ref3 : _i >= _ref3; _ref2 <= _ref3 ? _i += 1 : _i -= 1){ _result.push(_i); }
          return _result;
        }).call(this);
        if (this.exclusive) {
          range.pop();
        }
        return "[" + (range.join(', ')) + "]";
      }
      idt = this.idt(1);
      i = o.scope.freeVariable('i');
      result = o.scope.freeVariable('result');
      pre = "\n" + idt + result + " = [];";
      if (this.fromNum && this.toNum) {
        o.index = i;
        body = this.compileSimple(o);
      } else {
        vars = ("" + i + " = " + this.from) + (this.to !== this.toVar ? ", " + this.to : '');
        clause = "" + this.fromVar + " <= " + this.toVar + " ?";
        body = "var " + vars + "; " + clause + " " + i + " <" + this.equals + " " + this.toVar + " : " + i + " >" + this.equals + " " + this.toVar + "; " + clause + " " + i + " += 1 : " + i + " -= 1";
      }
      post = "{ " + result + ".push(" + i + "); }\n" + idt + "return " + result + ";\n" + o.indent;
      return "(function() {" + pre + "\n" + idt + "for (" + body + ")" + post + "}).call(this)";
    };
    return Range;
  })();
  exports.Slice = (function() {
    Slice = (function() {
      function Slice(_arg) {
        this.range = _arg;
        Slice.__super__.constructor.call(this);
        return this;
      };
      return Slice;
    })();
    __extends(Slice, Base);
    Slice.prototype.children = ['range'];
    Slice.prototype.compileNode = function(o) {
      var from, to;
      from = this.range.from ? this.range.from.compile(o) : '0';
      to = this.range.to ? this.range.to.compile(o) : '';
      to += !to || this.range.exclusive ? '' : ' + 1';
      if (to) {
        to = ', ' + to;
      }
      return ".slice(" + from + to + ")";
    };
    return Slice;
  })();
  exports.ObjectLiteral = (function() {
    ObjectLiteral = (function() {
      function ObjectLiteral(props) {
@@ -791,7 +688,7 @@
      o.indent = this.idt(1);
      nonComments = (function() {
        _result = [];
-        for (_i = 0, _len = (_ref2 = this.properties).length; _i < _len; _i++) {
+        for (_i = 0, _len = (_ref2 = this.properties).length; _i < _len; ++_i) {
          prop = _ref2[_i];
          if (!(prop instanceof Comment)) {
            _result.push(prop);
@@ -802,7 +699,7 @@
      lastNoncom = last(nonComments);
      props = (function() {
        _result = [];
-        for (i = 0, _len = (_ref2 = this.properties).length; i < _len; i++) {
+        for (i = 0, _len = (_ref2 = this.properties).length; i < _len; ++i) {
          prop = _ref2[i];
          _result.push((function() {
            join = i === this.properties.length - 1 ? '' : prop === lastNoncom || prop instanceof Comment ? '\n' : ',\n';
@@ -823,7 +720,7 @@
    };
    ObjectLiteral.prototype.assigns = function(name) {
      var _i, _len, _ref2, prop;
-      for (_i = 0, _len = (_ref2 = this.properties).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.properties).length; _i < _len; ++_i) {
        prop = _ref2[_i];
        if (prop.assigns(name)) {
          return true;
@@ -850,14 +747,14 @@
    ArrayLiteral.prototype.compileNode = function(o) {
      var _i, _len, _len2, _ref2, _ref3, code, i, obj, objects;
      o.indent = this.idt(1);
-      for (_i = 0, _len = (_ref2 = this.objects).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.objects).length; _i < _len; ++_i) {
        obj = _ref2[_i];
        if (obj instanceof Splat) {
          return this.compileSplatLiteral(o);
        }
      }
      objects = [];
-      for (i = 0, _len2 = (_ref3 = this.objects).length; i < _len2; i++) {
+      for (i = 0, _len2 = (_ref3 = this.objects).length; i < _len2; ++i) {
        obj = _ref3[i];
        code = obj.compileBare(o);
        objects.push(obj instanceof Comment ? "\n" + code + "\n" + o.indent : i === this.objects.length - 1 ? code : code + ', ');
@@ -867,7 +764,7 @@
    };
    ArrayLiteral.prototype.assigns = function(name) {
      var _i, _len, _ref2, obj;
-      for (_i = 0, _len = (_ref2 = this.objects).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.objects).length; _i < _len; ++_i) {
        obj = _ref2[_i];
        if (obj.assigns(name)) {
          return true;
@@ -914,7 +811,7 @@
      } else {
        constructor = new Code([], new Expressions([new Return(new Literal('this'))]));
      }
-      for (_i = 0, _len = (_ref2 = this.properties).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.properties).length; _i < _len; ++_i) {
        prop = _ref2[_i];
        pvar = prop.variable, func = prop.value;
        if (pvar && pvar.base.value === 'constructor') {
@@ -996,9 +893,6 @@
        if (this.variable.isArray() || this.variable.isObject()) {
          return this.compilePatternMatch(o);
        }
        if (this.variable.isSplice()) {
          return this.compileSplice(o);
        }
        if (ifn = If.unfoldSoak(o, this, 'variable')) {
          delete o.top;
          return ifn.compile(o);
@@ -1058,7 +952,7 @@
        assigns.push("" + (ref = o.scope.freeVariable('ref')) + " = " + valVar);
        valVar = ref;
      }
-      for (i = 0, _len = objects.length; i < _len; i++) {
+      for (i = 0, _len = objects.length; i < _len; ++i) {
        obj = objects[i];
        idx = i;
        if (isObject) {
@@ -1089,17 +983,6 @@
      code = assigns.join(', ');
      return top || this.parenthetical ? code : "(" + code + ")";
    };
    Assign.prototype.compileSplice = function(o) {
      var from, name, plus, range, ref, to, val;
      range = this.variable.properties.pop().range;
      name = this.variable.compile(o);
      plus = range.exclusive ? '' : ' + 1';
      from = range.from ? range.from.compile(o) : '0';
      to = range.to ? range.to.compile(o) + ' - ' + from + plus : "" + name + ".length";
      ref = o.scope.freeVariable('ref');
      val = this.value.compile(o);
      return "([].splice.apply(" + name + ", [" + from + ", " + to + "].concat(" + ref + " = " + val + ")), " + ref + ")";
    };
    Assign.prototype.compileConditional = function(o) {
      var _ref2, left, rite;
      _ref2 = this.variable.cacheReference(o), left = _ref2[0], rite = _ref2[1];
@@ -1140,7 +1023,7 @@
      delete o.globals;
      splat = undefined;
      params = [];
-      for (i = 0, _len = (_ref2 = this.params).length; i < _len; i++) {
+      for (i = 0, _len = (_ref2 = this.params).length; i < _len; ++i) {
        param = _ref2[i];
        if (splat) {
          if (param.attach) {
@@ -1168,7 +1051,7 @@
      o.scope.startLevel();
      params = (function() {
        _result = [];
-        for (_i = 0, _len2 = params.length; _i < _len2; _i++) {
+        for (_i = 0, _len2 = params.length; _i < _len2; ++_i) {
          param = params[_i];
          _result.push(param.compile(o));
        }
@@ -1177,7 +1060,7 @@
      if (!(empty || this.noReturn)) {
        this.body.makeReturn();
      }
-      for (_i = 0, _len2 = params.length; _i < _len2; _i++) {
+      for (_i = 0, _len2 = params.length; _i < _len2; ++_i) {
        param = params[_i];
        o.scope.parameter(param);
      }
@@ -1258,7 +1141,7 @@
        variadic = o.scope.freeVariable('result');
        o.scope.assign(variadic, len + ' >= ' + this.arglength);
        end = this.trailings.length ? ", " + len + " - " + this.trailings.length : undefined;
-        for (idx = 0, _len = (_ref2 = this.trailings).length; idx < _len; idx++) {
+        for (idx = 0, _len = (_ref2 = this.trailings).length; idx < _len; ++idx) {
          trailing = _ref2[idx];
          if (trailing.attach) {
            assign = trailing.assign;
@@ -1280,7 +1163,7 @@
      var _len, arg, args, code, end, i, prev;
      args = [];
      end = -1;
-      for (i = 0, _len = list.length; i < _len; i++) {
+      for (i = 0, _len = list.length; i < _len; ++i) {
        arg = list[i];
        code = arg.compile(o);
        prev = args[end];
@@ -1480,7 +1363,7 @@
      _ref3 = this.negated ? [' !== ', ' && '] : [' === ', ' || '], cmp = _ref3[0], cnj = _ref3[1];
      tests = (function() {
        _result = [];
-        for (i = 0, _len = (_ref4 = this.array.base.objects).length; i < _len; i++) {
+        for (i = 0, _len = (_ref4 = this.array.base.objects).length; i < _len; ++i) {
          item = _ref4[i];
          _result.push((i ? ref : sub) + cmp + item.compile(o));
        }
@@ -1616,22 +1499,16 @@
  })();
  exports.For = (function() {
    For = (function() {
-      function For(_arg, source, _arg2, _arg3) {
+      function For(_arg, head) {
        var _ref2;
        this.index = _arg3;
        this.name = _arg2;
        this.body = _arg;
-        For.__super__.constructor.call(this);
+        if (head.index instanceof Value) {
        this.source = source.source, this.guard = source.guard, this.step = source.step;
        this.raw = !!source.raw;
        this.object = !!source.object;
        if (this.object) {
          _ref2 = [this.index, this.name], this.name = _ref2[0], this.index = _ref2[1];
        }
        if (this.index instanceof Value) {
          throw SyntaxError('index cannot be a pattern matching expression');
        }
-        this.range = this.source instanceof Value && this.source.base instanceof Range && !this.source.properties.length;
+        For.__super__.constructor.call(this);
        extend(this, head);
        if (!this.object) {
          this.step || (this.step = new Literal(1));
        }
        this.pattern = this.name instanceof Value;
        if (this.range && this.pattern) {
          throw SyntaxError('cannot pattern match a range loop');
@@ -1642,7 +1519,7 @@
      return For;
    })();
    __extends(For, Base);
-    For.prototype.children = ['body', 'source', 'guard'];
+    For.prototype.children = ['body', 'source', 'guard', 'step', 'from', 'to'];
    For.prototype.topSensitive = YES;
    For.prototype.isStatement = YES;
    For.prototype.makeReturn = function() {
@@ -1659,16 +1536,16 @@
      return '';
    };
    For.prototype.compileNode = function(o) {
-      var body, codeInBody, forPart, guardPart, idt1, index, ivar, lastLine, lvar, name, namePart, nvar, ref, resultPart, returnResult, rvar, scope, source, sourcePart, stepPart, svar, topLevel, unstepPart, varPart, vars;
+      var _ref2, _ref3, _ref4, _ref5, _ref6, body, cond, forPart, guardPart, idt, index, ivar, lvar, name, namePart, pvar, resultDef, resultRet, rvar, scope, sourcePart, step, svar, tail, top, tvar, varPart, vars;
      topLevel = del(o, 'top') && !this.returns;
      source = this.range ? this.source.base : this.source;
      codeInBody = !this.body.containsPureStatement() && this.body.contains(function(node) {
        return node instanceof Code;
      });
      scope = o.scope;
-      name = this.name && this.name.compile(o);
+      top = del(o, 'top') && !this.returns;
-      index = this.index && this.index.compile(o);
+      name = !this.pattern && (((_ref2 = this.name) != null) ? _ref2.compile(o) : undefined);
-      if (name && !this.pattern && (this.range || !codeInBody)) {
+      index = ((_ref3 = this.index) != null) ? _ref3.compile(o) : undefined;
      ivar = !index ? scope.freeVariable('i') : index;
      varPart = '';
      body = Expressions.wrap([this.body]);
      idt = this.idt(1);
      if (name) {
        scope.find(name, {
          immediate: true
        });
@@ -1678,101 +1555,73 @@
          immediate: true
        });
      }
-      if (!topLevel) {
+      if (this.step) {
-        rvar = scope.freeVariable('result');
+        _ref4 = this.step.compileLoopReference(o, 'step'), step = _ref4[0], pvar = _ref4[1];
      }
-      ivar = this.range ? name : index;
+      if (this.from) {
-      if (!ivar || codeInBody) {
+        _ref5 = this.to.compileLoopReference(o, 'to'), tail = _ref5[0], tvar = _ref5[1];
-        ivar = scope.freeVariable('i');
+        vars = "" + ivar + " = " + (this.from.compile(o));
-      }
+        if (tail !== tvar) {
-      if (name && !this.range && codeInBody) {
+          vars += ", " + tail;
-        nvar = scope.freeVariable('i');
+        }
-      }
+        cond = +pvar ? "" + ivar + " " + (pvar < 0 ? '>' : '<') + "= " + tvar : "" + pvar + " < 0 ? " + ivar + " >= " + tvar + " : " + ivar + " <= " + tvar;
      varPart = '';
      guardPart = '';
      unstepPart = '';
      body = Expressions.wrap([this.body]);
      idt1 = this.idt(1);
      if (this.range) {
        forPart = source.compile(merge(o, {
          index: ivar,
          step: this.step
        }));
      } else {
-        svar = sourcePart = this.source.compile(o);
+        if (name || !this.raw) {
-        if ((name || !this.raw) && !(IDENTIFIER.test(svar) && scope.check(svar, {
+          _ref6 = this.source.compileLoopReference(o, 'ref'), sourcePart = _ref6[0], svar = _ref6[1];
-          immediate: true
+          if (!(sourcePart === svar || this.object)) {
        }))) {
          sourcePart = "" + (ref = scope.freeVariable('ref')) + " = " + svar;
          if (!this.object) {
            sourcePart = "(" + sourcePart + ")";
          }
-          svar = ref;
+        } else {
          sourcePart = svar = this.source.compile(o);
        }
        namePart = this.pattern ? new Assign(this.name, new Literal("" + svar + "[" + ivar + "]")).compile(merge(o, {
          top: true
        })) : name ? "" + name + " = " + svar + "[" + ivar + "]" : undefined;
        if (!this.object) {
-          lvar = scope.freeVariable('len');
+          if (0 > pvar && (pvar | 0) === +pvar) {
-          stepPart = this.step ? "" + ivar + " += " + (this.step.compile(o)) : "" + ivar + "++";
+            vars = "" + ivar + " = " + sourcePart + ".length - 1";
-          forPart = "" + ivar + " = 0, " + lvar + " = " + sourcePart + ".length; " + ivar + " < " + lvar + "; " + stepPart;
+            cond = "" + ivar + " >= 0";
          } else {
            lvar = scope.freeVariable('len');
            vars = "" + ivar + " = 0, " + lvar + " = " + sourcePart + ".length";
            cond = "" + ivar + " < " + lvar;
          }
        }
      }
-      resultPart = rvar ? "" + this.tab + rvar + " = [];\n" : '';
+      if (this.object) {
-      returnResult = this.compileReturnValue(rvar, o);
+        forPart = "" + ivar + " in " + sourcePart;
-      if (!topLevel) {
+        guardPart = !this.raw && ("" + idt + "if (!" + (utility('hasProp')) + ".call(" + svar + ", " + ivar + ")) continue;\n");
      } else {
        if (step !== pvar) {
          vars += ", " + step;
        }
        forPart = ("" + vars + "; " + cond + "; ") + (function() {
          switch (+pvar) {
            case 1:
              return '++' + ivar;
            case -1:
              return '--' + ivar;
            default:
              return ivar + (pvar < 0 ? ' -= ' + pvar.slice(1) : ' += ' + pvar);
          }
        })();
      }
      if (!top) {
        rvar = scope.freeVariable('result');
        resultDef = "" + this.tab + rvar + " = [];\n";
        resultRet = this.compileReturnValue(rvar, o);
        body = Push.wrap(rvar, body);
      }
      if (this.guard) {
        body = Expressions.wrap([new If(this.guard, body)]);
      }
-      if (codeInBody) {
+      if (namePart) {
-        if (this.range) {
+        varPart = "" + idt + namePart + ";\n";
          body.unshift(new Literal("var " + name + " = " + ivar));
        }
        if (namePart) {
          body.unshift(new Literal("var " + namePart));
        }
        if (index) {
          body.unshift(new Literal("var " + index + " = " + ivar));
        }
        lastLine = body.expressions.pop();
        if (index) {
          body.push(new Assign(new Literal(ivar), new Literal(index)));
        }
        if (nvar) {
          body.push(new Assign(new Literal(nvar), new Literal(name)));
        }
        body.push(lastLine);
        o.indent = this.idt(1);
        body = Expressions.wrap([new Literal(body.compile(o))]);
        if (index) {
          body.push(new Assign(this.index, new Literal(ivar)));
        }
        if (name) {
          body.push(new Assign(this.name, new Literal(nvar || ivar)));
        }
      } else {
        if (namePart) {
          varPart = "" + idt1 + namePart + ";\n";
        }
        if (forPart && name === ivar) {
          unstepPart = this.step ? "" + name + " -= " + (this.step.compile(o)) + ";" : "" + name + "--;";
          unstepPart = ("\n" + this.tab) + unstepPart;
        }
      }
-      if (this.object) {
+      return "" + (resultDef || '') + this.tab + "for (" + forPart + ") {\n" + (guardPart || '') + varPart + (body.compile(merge(o, {
-        forPart = "" + ivar + " in " + sourcePart;
+        indent: idt,
        if (!this.raw) {
          guardPart = "\n" + idt1 + "if (!" + (utility('hasProp')) + ".call(" + svar + ", " + ivar + ")) continue;";
        }
      }
      body = body.compile(merge(o, {
        indent: idt1,
        top: true
-      }));
+      }))) + "\n" + this.tab + "}" + (resultRet || '');
      vars = this.range ? name : "" + name + ", " + ivar;
      return "" + resultPart + this.tab + "for (" + forPart + ") {" + guardPart + "\n" + varPart + body + "\n" + this.tab + "}" + unstepPart + returnResult;
    };
    return For;
  })();
@@ -1792,7 +1641,7 @@
    Switch.prototype.isStatement = YES;
    Switch.prototype.makeReturn = function() {
      var _i, _len, _ref2, pair;
-      for (_i = 0, _len = (_ref2 = this.cases).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.cases).length; _i < _len; ++_i) {
        pair = _ref2[_i];
        pair[1].makeReturn();
      }
@@ -1807,9 +1656,9 @@
      idt2 = o.indent = this.idt(2);
      o.top = true;
      code = "" + this.tab + "switch (" + ((((_ref2 = this.subject) != null) ? _ref2.compile(o) : undefined) || true) + ") {";
-      for (_i = 0, _len = (_ref3 = this.cases).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref3 = this.cases).length; _i < _len; ++_i) {
        _ref4 = _ref3[_i], conditions = _ref4[0], block = _ref4[1];
-        for (_j = 0, _len2 = (_ref5 = flatten([conditions])).length; _j < _len2; _j++) {
+        for (_j = 0, _len2 = (_ref5 = flatten([conditions])).length; _j < _len2; ++_j) {
          condition = _ref5[_j];
          if (!this.subject) {
            condition = condition.invert().invert();
@@ -1968,7 +1817,7 @@
  TAB = '  ';
  TRAILING_WHITESPACE = /[ \t]+$/gm;
  IDENTIFIER = /^[$A-Za-z_][$\w]*$/;
-  NUMBER = /^0x[\da-f]+$|^(?:\d+(\.\d+)?|\.\d+)(?:e[+-]?\d+)?$/i;
+  NUMBER = /^-?(?:0x[\da-f]+|(?:\d+(\.\d+)?|\.\d+)(?:e[+-]?\d+)?)$/i;
  SIMPLENUM = /^[+-]?\d+$/;
  IS_STRING = /^['"]/;
  utility = function(name) {
--- a/lib/optparse.js
+++ b/lib/optparse.js
@@ -15,11 +15,11 @@
        arguments: []
      };
      args = normalizeArguments(args);
-      for (i = 0, _len = args.length; i < _len; i++) {
+      for (i = 0, _len = args.length; i < _len; ++i) {
        arg = args[i];
        isOption = !!(arg.match(LONG_FLAG) || arg.match(SHORT_FLAG));
        matchedRule = false;
-        for (_i = 0, _len2 = (_ref = this.rules).length; _i < _len2; _i++) {
+        for (_i = 0, _len2 = (_ref = this.rules).length; _i < _len2; ++_i) {
          rule = _ref[_i];
          if (rule.shortFlag === arg || rule.longFlag === arg) {
            value = rule.hasArgument ? args[i += 1] : true;
@@ -44,7 +44,7 @@
      if (this.banner) {
        lines.unshift("" + this.banner + "\n");
      }
-      for (_i = 0, _len = (_ref = this.rules).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref = this.rules).length; _i < _len; ++_i) {
        rule = _ref[_i];
        spaces = 15 - rule.longFlag.length;
        spaces = spaces > 0 ? Array(spaces + 1).join(' ') : '';
@@ -62,7 +62,7 @@
  buildRules = function(rules) {
    var _i, _len, _result, tuple;
    _result = [];
-    for (_i = 0, _len = rules.length; _i < _len; _i++) {
+    for (_i = 0, _len = rules.length; _i < _len; ++_i) {
      tuple = rules[_i];
      _result.push((function() {
        if (tuple.length < 3) {
@@ -91,10 +91,10 @@
    var _i, _j, _len, _len2, _ref, arg, l, match, result;
    args = args.slice(0);
    result = [];
-    for (_i = 0, _len = args.length; _i < _len; _i++) {
+    for (_i = 0, _len = args.length; _i < _len; ++_i) {
      arg = args[_i];
      if (match = arg.match(MULTI_FLAG)) {
-        for (_j = 0, _len2 = (_ref = match[1].split('')).length; _j < _len2; _j++) {
+        for (_j = 0, _len2 = (_ref = match[1].split('')).length; _j < _len2; ++_j) {
          l = _ref[_j];
          result.push('-' + l);
        }
--- a/lib/parser.js
+++ b/lib/parser.js
--- a/lib/rewriter.js
+++ b/lib/rewriter.js
@@ -87,7 +87,7 @@
  };
  exports.Rewriter.prototype.removeLeadingNewlines = function() {
    var _len, _ref, i, tag;
-    for (i = 0, _len = (_ref = this.tokens).length; i < _len; i++) {
+    for (i = 0, _len = (_ref = this.tokens).length; i < _len; ++i) {
      tag = _ref[i][0];
      if (tag !== 'TERMINATOR') {
        break;
@@ -286,7 +286,7 @@
    this.scanTokens(function(token, i) {
      var _i, _len, _ref, _ref2, close, open, tag;
      tag = token[0];
-      for (_i = 0, _len = (_ref = pairs).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref = pairs).length; _i < _len; ++_i) {
        _ref2 = _ref[_i], open = _ref2[0], close = _ref2[1];
        levels[open] |= 0;
        if (tag === open) {
@@ -366,7 +366,7 @@
  INVERSES = {};
  EXPRESSION_START = [];
  EXPRESSION_END = [];
-  for (_i = 0, _len = BALANCED_PAIRS.length; _i < _len; _i++) {
+  for (_i = 0, _len = BALANCED_PAIRS.length; _i < _len; ++_i) {
    _ref = BALANCED_PAIRS[_i], left = _ref[0], rite = _ref[1];
    EXPRESSION_START.push(INVERSES[rite] = left);
    EXPRESSION_END.push(INVERSES[left] = rite);
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -42,7 +42,7 @@
    };
    Scope.prototype.endLevel = function() {
      var _i, _len, _ref2, name;
-      for (_i = 0, _len = (_ref2 = this.garbage.pop()).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.garbage.pop()).length; _i < _len; ++_i) {
        name = _ref2[_i];
        if (this.type(name) === 'var') {
          this.add(name, 'reuse');
@@ -59,7 +59,7 @@
    };
    Scope.prototype.any = function(fn) {
      var _i, _len, _ref2, v;
-      for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; ++_i) {
        v = _ref2[_i];
        if (fn(v)) {
          return true;
@@ -83,7 +83,7 @@
    };
    Scope.prototype.type = function(name) {
      var _i, _len, _ref2, v;
-      for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; ++_i) {
        v = _ref2[_i];
        if (v.name === name) {
          return v.type;
@@ -122,7 +122,7 @@
      var _i, _len, _ref2, _ref3, _result, v;
      return (function() {
        _result = [];
-        for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; _i++) {
+        for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; ++_i) {
          v = _ref2[_i];
          if ((_ref3 = v.type) === 'var' || _ref3 === 'reuse') {
            _result.push(v.name);
@@ -134,7 +134,7 @@
    Scope.prototype.assignedVariables = function() {
      var _i, _len, _ref2, _result, v;
      _result = [];
-      for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; _i++) {
+      for (_i = 0, _len = (_ref2 = this.variables).length; _i < _len; ++_i) {
        v = _ref2[_i];
        if (v.type.assigned) {
          _result.push("" + v.name + " = " + v.type.value);
--- a/src/browser.coffee
+++ b/src/browser.coffee
@@ -33,7 +33,7 @@ runScripts = ->
      if script.src
        CoffeeScript.load script.src
      else
-        setTimeout -> CoffeeScript.run script.innerHTML
+        CoffeeScript.run script.innerHTML
  null
 if window.addEventListener
  addEventListener 'DOMContentLoaded', runScripts, no
--- a/src/grammar.coffee
+++ b/src/grammar.coffee
@@ -15,7 +15,7 @@
 # from our rules and saves it into `lib/parser.js`.
 # The only dependency is on the **Jison.Parser**.
-Parser = require('jison').Parser
+{Parser} = require 'jison'
 # Jison DSL
 # ---------
@@ -35,7 +35,7 @@ o = (patternString, action, options) ->
  return [patternString, '$$ = $1;', options] unless action
  action = if match = unwrap.exec action then match[1] else "(#{action}())"
  action = action.replace /\bnew /g, '$&yy.'
-  action = action.replace /\bExpressions\.wrap\b/g, 'yy.$&'
+  action = action.replace /\b(?:Expressions\.wrap|extend)\b/g, 'yy.$&'
  [patternString, "$$ = #{action};", options]
 # Grammatical Rules
@@ -144,14 +144,14 @@ grammar =
  # Assignment when it happens within an object literal. The difference from
  # the ordinary **Assign** is that these allow numbers and strings as keys.
  AssignObj: [
-    o "Identifier",                             -> new Value $1
+    o 'Identifier',                               -> new Value $1
-    o "AlphaNumeric"
+    o 'AlphaNumeric'
-    o "ThisProperty"
+    o 'ThisProperty'
-    o "Identifier   : Expression",                -> new Assign new Value($1), $3, 'object'
+    o 'Identifier   : Expression',                -> new Assign new Value($1), $3, 'object'
-    o "AlphaNumeric : Expression",                -> new Assign new Value($1), $3, 'object'
+    o 'AlphaNumeric : Expression',                -> new Assign new Value($1), $3, 'object'
-    o "Identifier   : INDENT Expression OUTDENT", -> new Assign new Value($1), $4, 'object'
+    o 'Identifier   : INDENT Expression OUTDENT', -> new Assign new Value($1), $4, 'object'
-    o "AlphaNumeric : INDENT Expression OUTDENT", -> new Assign new Value($1), $4, 'object'
+    o 'AlphaNumeric : INDENT Expression OUTDENT', -> new Assign new Value($1), $4, 'object'
-    o "Comment"
+    o 'Comment'
  ]
  # A return statement from a function body.
@@ -233,7 +233,6 @@ grammar =
    o "Assignable"
    o "Literal",                                -> new Value $1
    o "Parenthetical",                          -> new Value $1
    o "Range",                                  -> new Value $1
    o "This"
  ]
@@ -251,8 +250,8 @@ grammar =
  # Indexing into an object or array using bracket notation.
  Index: [
    o "INDEX_START Expression INDEX_END",       -> new Index $2
-    o "INDEX_SOAK Index",                       -> $2.soakNode = yes; $2
+    o "INDEX_SOAK  Index",                      -> extend $2, soakNode: yes
-    o "INDEX_PROTO Index",                      -> $2.proto = yes; $2
+    o "INDEX_PROTO Index",                      -> extend $2, proto: yes
  ]
  # In CoffeeScript, an object literal is simply a list of assignments.
@@ -330,28 +329,11 @@ grammar =
    o "@",                                      -> new Value new Literal 'this'
  ]
  RangeDots: [
    o "..",                                     -> 'inclusive'
    o "...",                                    -> 'exclusive'
  ]
  # A reference to a property on *this*.
  ThisProperty: [
    o "@ Identifier",                           -> new Value new Literal('this'), [new Accessor($2)], 'this'
  ]
  # The CoffeeScript range literal.
  Range: [
    o "[ Expression RangeDots Expression ]",    -> new Range $2, $4, $3
  ]
  # The slice literal.
  Slice: [
    o "INDEX_START Expression RangeDots Expression INDEX_END", -> new Range $2, $4, $3
    o "INDEX_START Expression RangeDots INDEX_END", -> new Range $2, null, $3
    o "INDEX_START RangeDots Expression INDEX_END", -> new Range null, $3, $2
  ]
  # The array literal.
  Array: [
    o "[ ]",                                    -> new ArrayLiteral []
@@ -435,48 +417,49 @@ grammar =
  # Comprehensions can either be normal, with a block of expressions to execute,
  # or postfix, with a single expression.
  For: [
-    o "Statement ForBody",                      -> new For $1, $2, $2.vars[0], $2.vars[1]
+    o 'Statement  ForBody', -> new For $1, $2
-    o "Expression ForBody",                     -> new For $1, $2, $2.vars[0], $2.vars[1]
+    o 'Expression ForBody', -> new For $1, $2
-    o "ForBody Block",                          -> new For $2, $1, $1.vars[0], $1.vars[1]
+    o 'ForBody    Block',   -> new For $2, $1
  ]
  ForBody: [
    o "FOR Range",                              -> source: new Value($2), vars: []
    o "ForStart ForSource",                     -> $2.raw = $1.raw; $2.vars = $1; $2
  ]
  ForStart: [
    o "FOR ForVariables",                       -> $2
    o "FOR ALL ForVariables",                   -> $3.raw = true; $3
  ]
  # An array of all accepted values for a variable inside the loop. This
  # enables support for pattern matching.
  ForValue: [
-    o "Identifier"
+    o 'Identifier'
-    o "Array",                                  -> new Value $1
+    o 'Array',  -> new Value $1
-    o "Object",                                 -> new Value $1
+    o 'Object', -> new Value $1
  ]
-  # An array or range comprehension has variables for the current element and
+  ForIn: [
-  # (optional) reference to the current index. Or, *key, value*, in the case
+    o 'FORIN Expression',                               -> source: $2
-  # of object comprehensions.
+    o 'FORIN Expression WHEN Expression',               -> source: $2, guard: $4
-  ForVariables: [
+    o 'FORIN Expression BY Expression',                 -> source: $2, step: $4
-    o "ForValue",                               -> [$1]
+    o 'FORIN Expression BY Expression WHEN Expression', -> source: $2, step: $4, guard: $6
-    o "ForValue , ForValue",                    -> [$1, $3]
+  ]
  ForOf: [
    o 'FOROF Expression',                 -> object: on, source: $2
    o 'FOROF Expression WHEN Expression', -> object: on, source: $2, guard: $4
  ]
  ForTo: [
    o 'TO Expression',                               -> to: $2
    o 'TO Expression WHEN Expression',               -> to: $2, guard: $4
    o 'TO Expression BY Expression',                 -> to: $2, step: $4
    o 'TO Expression BY Expression WHEN Expression', -> to: $2, step: $4, guard: $6
  ]
  # The source of a comprehension is an array or object with an optional guard
  # clause. If it's an array comprehension, you can also choose to step through
  # in fixed-size increments.
-  ForSource: [
+  ForBody: [
-    o "FORIN Expression",                               -> source: $2
+    o 'FOR ForValue ForIn',                   -> extend $3, name: $2
-    o "FOROF Expression",                               -> source: $2, object: true
+    o 'FOR ForValue , Identifier ForIn',      -> extend $5, name: $2, index: $4
-    o "FORIN Expression WHEN Expression",               -> source: $2, guard: $4
+    o 'FOR Identifier ForOf',                 -> extend $3, index: $2
-    o "FOROF Expression WHEN Expression",               -> source: $2, guard: $4, object: true
+    o 'FOR ForValue , ForValue ForOf',        -> extend $5, index: $2, name: $4
-    o "FORIN Expression BY Expression",                 -> source: $2, step:  $4
+    o 'FOR ALL Identifier ForOf',             -> extend $4, raw: on, index: $3
-    o "FORIN Expression WHEN Expression BY Expression", -> source: $2, guard: $4, step:   $6
+    o 'FOR ALL Identifier , ForValue ForOf',  -> extend $6, raw: on, index: $3, name: $5
-    o "FORIN Expression BY Expression WHEN Expression", -> source: $2, step:  $4, guard: $6
+    o 'FOR Identifier FROM Expression ForTo', -> extend $5, index: $2, from: $4
  ]
  Switch: [
@@ -578,7 +561,7 @@ operators = [
  ["left",      'LOGIC']
  ["left",      '.']
  ["nonassoc",  'INDENT', 'OUTDENT']
-  ["right",     'WHEN', 'LEADING_WHEN', 'FORIN', 'FOROF', 'BY', 'THROW']
+  ["right",     'WHEN', 'LEADING_WHEN', 'FORIN', 'FOROF', 'FROM', 'TO', 'BY', 'THROW']
  ["right",     'IF', 'UNLESS', 'ELSE', 'FOR', 'WHILE', 'UNTIL', 'LOOP', 'SUPER', 'CLASS', 'EXTENDS']
  ["right",     '=', ':', 'COMPOUND_ASSIGN', 'RETURN']
  ["right",     '->', '=>', 'UNLESS', 'POST_IF', 'POST_UNLESS']
@@ -592,7 +575,7 @@ operators = [
 # terminals (every symbol which does not appear as the name of a rule above)
 # as "tokens".
 tokens = []
-for name, alternatives of grammar
+for all name, alternatives of grammar
  grammar[name] = for alt in alternatives
    for token in alt[0].split ' '
      tokens.push token unless grammar[token]
--- a/src/lexer.coffee
+++ b/src/lexer.coffee
@@ -41,9 +41,10 @@ exports.Lexer = class Lexer
    @indent  = 0            # The current indentation level.
    @indebt  = 0            # The over-indentation at the current level.
    @outdebt = 0            # The under-outdentation at the current level.
    @seenFor = no           # The flag for distinguishing FORIN/FOROF from IN/OF.
    @indents = []           # The stack of all current indentation levels.
    @tokens  = []           # Stream of parsed tokens in the form ['TYPE', value, line]
    # Flags for distinguishing FORIN/FOROF/FROM/TO.
    @seenFor = @seenFrom = no
    # At every position, run through this list of attempted matches,
    # short-circuiting if any of them succeed. Their order determines precedence:
    # `@literalToken` is the fallback catch-all.
@@ -78,6 +79,15 @@ exports.Lexer = class Lexer
    if id is 'all' and @tag() is 'FOR'
      @token 'ALL', id
      return true
    if id is 'from' and @tag(1) is 'FOR'
      @seenFor  = no
      @seenFrom = yes
      @token 'FROM', id
      return true
    if id is 'to' and @seenFrom
      @seenFrom = no
      @token 'TO', id
      return true
    forcedIdentifier = colon or @tagAccessor()
    tag = 'IDENTIFIER'
    if id in JS_KEYWORDS or
@@ -426,7 +436,7 @@ exports.Lexer = class Lexer
      i += 1
    if levels.length
      throw SyntaxError "Unterminated #{levels.pop()[0]} starting on line #{@line + 1}"
-    if not i then false else str[0...i]
+    i and str.slice 0, i
  # Expand variables and expressions inside double-quoted strings using
  # Ruby-like notation for substitution of arbitrary expressions.
@@ -549,7 +559,7 @@ IDENTIFIER = /// ^
 ///
 NUMBER     = /^0x[\da-f]+|^(?:\d+(\.\d+)?|\.\d+)(?:e[+-]?\d+)?/i
 HEREDOC    = /^("""|''')([\s\S]*?)(?:\n[ \t]*)?\1/
-OPERATOR   = /// ^ (?: -[-=>]? | \+[+=]? | \.\.\.? | [*&|/%=<>^:!?]+ ) ///
+OPERATOR   = /// ^ (?: -[-=>]? | \+[+=]? | \.{3} | [*&|/%=<>^:!?]+ ) ///
 WHITESPACE = /^[ \t]+/
 COMMENT    = /^###([^#][\s\S]*?)(?:###[ \t]*\n|(?:###)?$)|^(?:\s*#(?!##[^#]).*)+/
 CODE       = /^[-=]>/
@@ -579,7 +589,7 @@ MULTILINER      = /\n/g
 HEREDOC_INDENT  = /\n+([ \t]*)/g
 ASSIGNED        = /^\s*@?[$A-Za-z_][$\w]*[ \t]*?[:=][^:=>]/
 NEXT_CHARACTER  = /^\s*(\S?)/
-NEXT_ELLIPSIS   = /^\s*\.\.\.?/
+NEXT_ELLIPSIS   = /^\s*\.{3}/
 LEADING_SPACES  = /^\s+/
 TRAILING_SPACES = /\s+$/
 NO_NEWLINE      = /// ^
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -6,7 +6,9 @@
 {Scope} = require './scope'
 # Import the helpers we plan to use.
-{compact, flatten, merge, del, starts, ends, last} = require './helpers'
+{compact, flatten, extend, merge, del, starts, ends, last} = require './helpers'
 exports.extend = extend  # for parser
 # Constant functions for nodes that don't need customization.
 YES  = -> yes
@@ -73,6 +75,14 @@ exports.Base = class Base
    @parenthetical = on
    @compile o
  # Compile to a source/variable pair suitable for looping.
  compileLoopReference: (o, name) ->
    src = tmp = @compile o
    unless NUMBER.test(src) or
           IDENTIFIER.test(src) and o.scope.check(src, immediate: on)
      src = "#{ tmp = o.scope.freeVariable name } = #{src}"
    [src, tmp]
  # Convenience method to grab the current indentation level, plus tabbing in.
  idt: (tabs) ->
    (@tab or '') + Array((tabs or 0) + 1).join TAB
@@ -329,9 +339,6 @@ exports.Value = class Value extends Base
  isObject: ->
    @base instanceof ObjectLiteral and not @properties.length
  isSplice: ->
    last(@properties) instanceof Slice
  isComplex: ->
    @base.isComplex() or @hasProperties()
@@ -590,96 +597,6 @@ exports.Index = class Index extends Base
  isComplex: -> @index.isComplex()
 #### Range
 # A range literal. Ranges can be used to extract portions (slices) of arrays,
 # to specify a range for comprehensions, or as a value, to be expanded into the
 # corresponding array of integers at runtime.
 exports.Range = class Range extends Base
  children: ['from', 'to']
  constructor: (@from, @to, tag) ->
    super()
    @exclusive = tag is 'exclusive'
    @equals = if @exclusive then '' else '='
  # Compiles the range's source variables -- where it starts and where it ends.
  # But only if they need to be cached to avoid double evaluation.
  compileVariables: (o) ->
    o = merge(o, top: true)
    [@from, @fromVar] =  @from.compileReference o, precompile: yes
    [@to, @toVar] =      @to.compileReference o, precompile: yes
    [@fromNum, @toNum] = [@fromVar.match(SIMPLENUM), @toVar.match(SIMPLENUM)]
    parts = []
    parts.push @from if @from isnt @fromVar
    parts.push @to if @to isnt @toVar
  # When compiled normally, the range returns the contents of the *for loop*
  # needed to iterate over the values in the range. Used by comprehensions.
  compileNode: (o) ->
    @compileVariables o
    return    @compileArray(o)  unless o.index
    return    @compileSimple(o) if @fromNum and @toNum
    idx      = del o, 'index'
    step     = del o, 'step'
    vars     = "#{idx} = #{@from}" + if @to isnt @toVar then ", #{@to}" else ''
    intro    = "(#{@fromVar} <= #{@toVar} ? #{idx}"
    compare  = "#{intro} <#{@equals} #{@toVar} : #{idx} >#{@equals} #{@toVar})"
    stepPart = if step then step.compile(o) else '1'
    incr     = if step then "#{idx} += #{stepPart}" else "#{intro} += #{stepPart} : #{idx} -= #{stepPart})"
    "#{vars}; #{compare}; #{incr}"
  # Compile a simple range comprehension, with integers.
  compileSimple: (o) ->
    [from, to] = [+@fromNum, +@toNum]
    idx        = del o, 'index'
    step       = del o, 'step'
    step       and= "#{idx} += #{step.compile(o)}"
    if from <= to
      "#{idx} = #{from}; #{idx} <#{@equals} #{to}; #{step or "#{idx}++"}"
    else
      "#{idx} = #{from}; #{idx} >#{@equals} #{to}; #{step or "#{idx}--"}"
  # When used as a value, expand the range into the equivalent array.
  compileArray: (o) ->
    if @fromNum and @toNum and Math.abs(@fromNum - @toNum) <= 20
      range = [+@fromNum..+@toNum]
      range.pop() if @exclusive
      return "[#{ range.join(', ') }]"
    idt    = @idt 1
    i      = o.scope.freeVariable 'i'
    result = o.scope.freeVariable 'result'
    pre    = "\n#{idt}#{result} = [];"
    if @fromNum and @toNum
      o.index = i
      body = @compileSimple o
    else
      vars = "#{i} = #{@from}" + if @to isnt @toVar then ", #{@to}" else ''
      clause = "#{@fromVar} <= #{@toVar} ?"
      body   = "var #{vars}; #{clause} #{i} <#{@equals} #{@toVar} : #{i} >#{@equals} #{@toVar}; #{clause} #{i} += 1 : #{i} -= 1"
    post   = "{ #{result}.push(#{i}); }\n#{idt}return #{result};\n#{o.indent}"
    "(function() {#{pre}\n#{idt}for (#{body})#{post}}).call(this)"
 #### Slice
 # An array slice literal. Unlike JavaScript's `Array#slice`, the second parameter
 # specifies the index of the end of the slice, just as the first parameter
 # is the index of the beginning.
 exports.Slice = class Slice extends Base
  children: ['range']
  constructor: (@range) ->
    super()
  compileNode: (o) ->
    from  =  if @range.from then @range.from.compile(o) else '0'
    to    =  if @range.to then @range.to.compile(o) else ''
    to    += if not to or @range.exclusive then '' else ' + 1'
    to    =  ', ' + to if to
    ".slice(#{from}#{to})"
 #### ObjectLiteral
 # An object literal, nothing fancy.
@@ -863,7 +780,6 @@ exports.Assign = class Assign extends Base
  compileNode: (o) ->
    if isValue = @variable instanceof Value
      return @compilePatternMatch(o) if @variable.isArray() or @variable.isObject()
      return @compileSplice(o) if @variable.isSplice()
      if ifn = If.unfoldSoak o, this, 'variable'
        delete o.top
        return ifn.compile o
@@ -933,18 +849,6 @@ exports.Assign = class Assign extends Base
    code = assigns.join ', '
    if top or @parenthetical then code else "(#{code})"
  # Compile the assignment from an array splice literal, using JavaScript's
  # `Array#splice` method.
  compileSplice: (o) ->
    {range} = @variable.properties.pop()
    name  = @variable.compile o
    plus  = if range.exclusive then '' else ' + 1'
    from  = if range.from then range.from.compile(o) else '0'
    to    = if range.to then range.to.compile(o) + ' - ' + from + plus else "#{name}.length"
    ref   = o.scope.freeVariable 'ref'
    val   = @value.compile(o)
    "([].splice.apply(#{name}, [#{from}, #{to}].concat(#{ref} = #{val})), #{ref})"
  # When compiling a conditional assignment, take care to ensure that the
  # operands are only evaluated once, even though we have to reference them
  # more than once.
@@ -1399,19 +1303,17 @@ exports.Parens = class Parens extends Base
 # you can map and filter in a single pass.
 exports.For = class For extends Base
-  children: ['body', 'source', 'guard']
+  children: ['body', 'source', 'guard', 'step', 'from', 'to']
  topSensitive: YES
  isStatement : YES
-  constructor: (@body, source, @name, @index) ->
+  constructor: (@body, head) ->
    if head.index instanceof Value
      throw SyntaxError 'index cannot be a pattern matching expression'
    super()
-    {@source, @guard, @step} = source
+    extend this, head
-    @raw    = !!source.raw
+    @step  or= new Literal 1 unless @object
    @object = !!source.object
    [@name, @index] = [@index, @name] if @object
    throw SyntaxError 'index cannot be a pattern matching expression' if @index instanceof Value
    @range   = @source instanceof Value and @source.base instanceof Range and not @source.properties.length
    @pattern = @name instanceof Value
    throw SyntaxError 'cannot pattern match a range loop' if @range and @pattern
    @returns = false
@@ -1430,71 +1332,64 @@ exports.For = class For extends Base
  # comprehensions. Some of the generated code can be shared in common, and
  # some cannot.
  compileNode: (o) ->
-    topLevel      = del(o, 'top') and not @returns
+    {scope} = o
-    source        = if @range then @source.base else @source
+    top     = del(o, 'top') and not @returns
-    codeInBody    = not @body.containsPureStatement() and @body.contains (node) -> node instanceof Code
+    name    = not @pattern and @name?.compile o
-    scope         = o.scope
+    index   = @index?.compile o
-    name          = @name  and @name.compile o
+    ivar    = if not index then scope.freeVariable 'i' else index
-    index         = @index and @index.compile o
+    varPart = ''
-    scope.find(name,  immediate: yes) if name and not @pattern and (@range or not codeInBody)
+    body    = Expressions.wrap [@body]
    idt     = @idt 1
    scope.find(name,  immediate: yes) if name
    scope.find(index, immediate: yes) if index
-    rvar          = scope.freeVariable 'result' unless topLevel
+    [step, pvar] = @step.compileLoopReference o, 'step' if @step
-    ivar          = if @range then name else index
+    if @from
-    ivar          = scope.freeVariable 'i' if not ivar or codeInBody
+      [tail, tvar] = @to.compileLoopReference o, 'to'
-    nvar          = scope.freeVariable 'i' if name and not @range and codeInBody
+      vars  = "#{ivar} = #{ @from.compile o }"
-    varPart       = ''
+      vars += ", #{tail}" if tail isnt tvar
-    guardPart     = ''
+      cond = if +pvar
-    unstepPart    = ''
+        "#{ivar} #{ if pvar < 0 then '>' else '<' }= #{tvar}"
-    body          = Expressions.wrap [@body]
+      else
-    idt1          = @idt 1
+        "#{pvar} < 0 ? #{ivar} >= #{tvar} : #{ivar} <= #{tvar}"
    if @range
      forPart = source.compile merge o, {index: ivar, @step}
    else
-      svar = sourcePart = @source.compile o
+      if name or not @raw
-      if (name or not @raw) and
+        [sourcePart, svar] = @source.compileLoopReference o, 'ref'
-         not (IDENTIFIER.test(svar) and scope.check svar, immediate: on)
+        sourcePart = "(#{sourcePart})" unless sourcePart is svar or @object
-        sourcePart = "#{ref = scope.freeVariable 'ref'} = #{svar}"
+      else
-        sourcePart = "(#{sourcePart})" unless @object
+        sourcePart = svar = @source.compile o
        svar = ref
      namePart = if @pattern
        new Assign(@name, new Literal "#{svar}[#{ivar}]").compile merge o, top: on
      else if name
        "#{name} = #{svar}[#{ivar}]"
      unless @object
-        lvar      = scope.freeVariable 'len'
+        if 0 > pvar and (pvar | 0) is +pvar  # negative int
-        stepPart  = if @step then "#{ivar} += #{ @step.compile(o) }" else "#{ivar}++"
+          vars = "#{ivar} = #{sourcePart}.length - 1"
-        forPart   = "#{ivar} = 0, #{lvar} = #{sourcePart}.length; #{ivar} < #{lvar}; #{stepPart}"
+          cond = "#{ivar} >= 0"
-    resultPart    = if rvar then "#{@tab}#{rvar} = [];\n" else ''
+        else
-    returnResult  = @compileReturnValue rvar, o
+          lvar = scope.freeVariable 'len'
-    body          = Push.wrap rvar, body unless topLevel
+          vars = "#{ivar} = 0, #{lvar} = #{sourcePart}.length"
-    if @guard
+          cond = "#{ivar} < #{lvar}"
      body        = Expressions.wrap [new If @guard, body]
    if codeInBody
      body.unshift  new Literal "var #{name} = #{ivar}" if @range
      body.unshift  new Literal "var #{namePart}" if namePart
      body.unshift  new Literal "var #{index} = #{ivar}" if index
      lastLine    = body.expressions.pop()
      body.push     new Assign new Literal(ivar), new Literal index if index
      body.push     new Assign new Literal(nvar), new Literal name if nvar
      body.push     lastLine
      o.indent    = @idt 1
      body        = Expressions.wrap [new Literal body.compile o]
      body.push     new Assign @index, new Literal ivar if index
      body.push     new Assign @name, new Literal nvar or ivar if name
    else
      varPart     = "#{idt1}#{namePart};\n" if namePart
      if forPart and name is ivar
        unstepPart = if @step then "#{name} -= #{ @step.compile(o) };" else "#{name}--;"
        unstepPart = "\n#{@tab}" + unstepPart
    if @object
-      forPart     = "#{ivar} in #{sourcePart}"
+      forPart   = "#{ivar} in #{sourcePart}"
-      guardPart   = "\n#{idt1}if (!#{utility('hasProp')}.call(#{svar}, #{ivar})) continue;" unless @raw
+      guardPart = not @raw and
-    body          = body.compile merge o, indent: idt1, top: true
+        "#{idt}if (!#{ utility 'hasProp' }.call(#{svar}, #{ivar})) continue;\n"
-    vars          = if @range then name else "#{name}, #{ivar}"
+    else
      vars += ", #{step}" if step isnt pvar
      forPart = "#{vars}; #{cond}; " + switch +pvar
        when  1 then '++' + ivar
        when -1 then '--' + ivar
        else ivar + if pvar < 0 then ' -= ' + pvar.slice 1 else ' += ' + pvar
    unless top
      rvar      = scope.freeVariable 'result'
      resultDef = "#{@tab}#{rvar} = [];\n"
      resultRet = @compileReturnValue rvar, o
      body      = Push.wrap rvar, body
    body = Expressions.wrap [new If @guard, body] if @guard
    varPart = "#{idt}#{namePart};\n" if namePart
    """
-    #{resultPart}#{@tab}for (#{forPart}) {#{guardPart}
+    #{ resultDef or '' }#{@tab}for (#{forPart}) {
-    #{varPart}#{body}
+    #{ guardPart or '' }#{varPart}#{ body.compile merge o, indent: idt, top: on }
-    #{@tab}}#{unstepPart}#{returnResult}
+    #{@tab}}#{ resultRet or '' }
    """
 #### Switch
@@ -1703,7 +1598,7 @@ TAB = '  '
 TRAILING_WHITESPACE = /[ \t]+$/gm
 IDENTIFIER = /^[$A-Za-z_][$\w]*$/
-NUMBER     = /^0x[\da-f]+$|^(?:\d+(\.\d+)?|\.\d+)(?:e[+-]?\d+)?$/i
+NUMBER     = /// ^ -? (?: 0x[\da-f]+ | (?:\d+(\.\d+)?|\.\d+)(?:e[+-]?\d+)? ) $ ///i
 SIMPLENUM  = /^[+-]?\d+$/
 # Is a literal value a string?
--- a/test/test_classes.coffee
+++ b/test/test_classes.coffee
@@ -177,7 +177,7 @@ ok obj.func().name is 'Dog'
 class Mini
  num: 10
  generate: =>
-    for i in [1..3]
+    for i from 1 to 3
      =>
        @num
--- a/test/test_comprehensions.coffee
+++ b/test/test_comprehensions.coffee
@@ -15,37 +15,15 @@ ok odds.join(' ')  is "one! three!"
 # Basic range comprehensions.
-nums = i * 3 for i in [1..3]
+nums = i * 3 for i from 1 to 3
-
+negs = x for x from -20 to -5*2
-negs = x for x in [-20..-5*2]
+eq nums.concat(negs.slice 0, 3).join(' '), '3 6 9 -20 -19 -18'
 negs = negs[0..2]
 result = nums.concat(negs).join(', ')
 ok result is '3, 6, 9, -20, -19, -18'
 ok i is 3
 ok x is -10
 # With range comprehensions, you can loop in steps.
-results = x for x in [0...15] by 5
+eq "#{ x for x from 0 to 9 by  3 }", '0,3,6,9'
-ok results.join(' ') is '0 5 10'
+eq "#{ x for x from 9 to 0 by -3 }", '9,6,3,0'
-
+eq "#{ x for x from 3*3 to 0*0 by 0-3 }", '9,6,3,0'
 results = x for x in [0..100] by 10
 ok results.join(' ') is '0 10 20 30 40 50 60 70 80 90 100'
 # And can loop downwards, with a negative step.
 results = x for x in [5..1]
 ok results.join(' ') is '5 4 3 2 1'
 ok results.join(' ') is [(10-5)..(-2+3)].join(' ')
 results = x for x in [10..1]
 ok results.join(' ') is [10..1].join(' ')
 results = x for x in [10...0] by -2
 ok results.join(' ') is [10, 8, 6, 4, 2].join(' ')
 # Multiline array comprehension with filter.
@@ -53,77 +31,29 @@ evens = for num in [1, 2, 3, 4, 5, 6] when num % 2 is 0
           num *= -1
           num -= 2
           num * -1
 eq evens + '', '4,6,8'
-ok evens.join(', ') is '4, 6, 8'
+
 # Backward traversing.
 odds = num for num in [0, 1, 2, 3, 4, 5] by -2
 eq odds + '', '5,3,1'
 # The in operator still works, standalone.
 ok 2 of evens
-
+# all/from/to aren't reserved.
-# Ensure that the closure wrapper preserves local variables.
+all = from = to = 1
 obj = {}
 for method in ['one', 'two', 'three']
  obj[method] = ->
    "I'm " + method
 ok obj.one()   is "I'm one"
 ok obj.two()   is "I'm two"
 ok obj.three() is "I'm three"
 i = 0
 for i in [1..3]
  -> 'func'
  break if false
 ok i is 3
 # Ensure that local variables are closed over for range comprehensions.
 funcs = for i in [1..3]
  -> -i
 ok (func() for func in funcs).join(' ') is '-1 -2 -3'
 ok i is 3
 # Ensure that closing over local variables doesn't break scoping laws.
 for i in [0]
  count = 0
  i = 50
  ->
 ok count is 0
 ok i is 50
 for [a, b] in [[0, 1]] then ->
 ok a is 0
 ok b is 1
 # Even when referenced in the filter.
 list = ['one', 'two', 'three']
 methods = for num, i in list when num isnt 'two' and i isnt 1
  -> num + ' ' + i
 ok methods.length is 2
 ok methods[0]() is 'one 0'
 ok methods[1]() is 'three 2'
 # Naked ranges are expanded into arrays.
 array = [0..10]
 ok(num % 2 is 0 for num in array by 2)
 # Nested comprehensions.
 multiLiner =
-  for x in [3..5]
+  for x from 3 to 5
-    for y in [3..5]
+    for y from 3 to 5
      [x, y]
 singleLiner =
-  [x, y] for y in [3..5] for x in [3..5]
+  [x, y] for y from 3 to 5 for x from 3 to 5
 ok multiLiner.length is singleLiner.length
 ok 5 is multiLiner[2][2][1]
@@ -159,11 +89,6 @@ ok own.join(' ') is 'Whiskers'
 ok all.sort().join(' ') is 'Whiskers cream tabby'
 # Optimized range comprehensions.
 exxes = 'x' for [0...10]
 ok exxes.join(' ') is 'x x x x x x x x x x'
 # Comprehensions safely redeclare parameters if they're not present in closest
 # scope.
 rule = (x) -> x
--- a/test/test_functions.coffee
+++ b/test/test_functions.coffee
@@ -62,11 +62,6 @@ ok Math.AnonymousAdd(10, 10) is 20
 ok Math.FastAdd(20, 20) is 40
 # Parens are optional on simple function calls.
 ok 100 > 1 if 1 > 0
 ok true unless false
 ok true for i in [1..3]
 okFunc = (f) -> ok(f())
 okFunc -> true
@@ -122,7 +117,7 @@ mult = (x, mids..., y) ->
 ok mult(1, 2,) is 2
 ok mult(1, 2, 3,) is 6
-ok mult(10,[1..6]...,) is 7200
+ok mult(10, (i for i from 1 to 6)...) is 7200
 # Test for inline functions with parentheses and implicit calls.
--- a/test/test_helpers.coffee
+++ b/test/test_helpers.coffee
@@ -1,6 +1,6 @@
 {starts, ends, compact, count, merge, extend, flatten, del, last} = CoffeeScript.helpers
-array  = [0..4]
+array  = [0, 1, 2, 3, 4]
 string = array.join ''
 object = {}
--- a/test/test_literals.coffee
+++ b/test/test_literals.coffee
@@ -14,10 +14,6 @@ ok value is 1
 value = 0.0 + -.25 - -.75 + 0.0
 ok value is 0.5
 # Decimals don't interfere with ranges.
 ok [0..10].join(' ') is  '0 1 2 3 4 5 6 7 8 9 10'
 ok [0...10].join(' ') is '0 1 2 3 4 5 6 7 8 9'
 # Can call methods directly on numbers.
 4.valueOf() is 4
--- a/test/test_ranges_slices_and_splices.coffee
+++ b/test/test_ranges_slices_and_splices.coffee
@@ -1,75 +0,0 @@
 # Slice.
 array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
 a = array[7..9]
 b = array[2...4]
 result = a.concat(b).join(' ')
 ok result is "7 8 9 2 3"
 a = [0, 1, 2, 3, 4, 5, 6, 7]
 eq a[2...6].join(' '), '2 3 4 5'
 # Ranges.
 countdown = [10..1].join(' ')
 ok countdown is "10 9 8 7 6 5 4 3 2 1"
 a = 1
 b = 5
 nums = [a...b]
 ok nums.join(' ') is '1 2 3 4'
 b = -5
 nums = [a..b]
 ok nums.join(' ') is '1 0 -1 -2 -3 -4 -5'
 # Expression-based range.
 array = [(1+5)..1+9]
 ok array.join(' ') is "6 7 8 9 10"
 array = [5..1]
 ok array.join(' ') is '5 4 3 2 1'
 array = [30...0]
 ok (len = array.length) is 30
 ok array[len - 1] is 1
 # String slicing (at least on Node).
 hello = "Hello World"
 ok hello[1...1] is ""
 ok hello[1..1] is "e"
 ok hello[1...5] is "ello"
 ok hello[0..4] is "Hello"
 # Splice literals.
 array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 array[5..10] = [0, 0, 0]
 ok array.join(' ') is '0 1 2 3 4 0 0 0'
 # Slices and splices that omit their beginning or end.
 array = [0..10]
 ok array[7..].join(' ')  is '7 8 9 10'
 ok array[-2..].join(' ') is '9 10'
 ok array[...3].join(' ') is '0 1 2'
 ok array[..-5].join(' ') is '0 1 2 3 4 5 6'
 array[3..] = [9, 8, 7]
 ok array.join(' ') is '0 1 2 9 8 7'
 array[...3] = [7, 8, 9]
 ok array.join(' ') is '7 8 9 9 8 7'
--- a/test/test_splats.coffee
+++ b/test/test_splats.coffee
@@ -37,7 +37,7 @@ ok last is "Usain Bolt"
 ok theField.length is 8
 contenders.reverse()
-medalists contenders[0...2]..., "Mighty Mouse", contenders[2...contenders.length]...
+medalists contenders.slice(0, 2)..., "Mighty Mouse", contenders.slice(2)...
 ok gold is "Usain Bolt"
 ok silver is "Asafa Powell"
@@ -69,7 +69,7 @@ crowd = [
 bests = [
  "Mighty Mouse"
-  contenders[0..3]...
+  contenders.slice(0, 4)...
 ]
 ok crowd[0] is contenders[0]