nodes.js

(function() {
  var Access, Arr, Assign, Await, Base, Block, CALL_CONTINUATION, Call, Class, Closure, Code, Comment, CpsCascade, Existence, Extends, For, IDENTIFIER, IDENTIFIER_STR, IS_STRING, If, In, Index, LEVEL_ACCESS, LEVEL_COND, LEVEL_LIST, LEVEL_OP, LEVEL_PAREN, LEVEL_TOP, Literal, METHOD_DEF, NEGATE, NO, Obj, Op, Param, Parens, RESERVED, Range, Return, SIMPLENUM, Scope, Slice, Splat, Switch, TAB, THIS, Throw, Try, UTILITIES, Value, While, YES, compact, del, ends, extend, flatten, last, merge, multident, starts, tame, unfoldSoak, utility, _ref;
  var __hasProp = Object.prototype.hasOwnProperty, __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor; child.__super__ = parent.prototype; return child; }, __indexOf = Array.prototype.indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (__hasProp.call(this, i) && this[i] === item) return i; } return -1; };

  Scope = require('./scope').Scope;

  RESERVED = require('./lexer').RESERVED;

  tame = require('./tame');

  _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;
  };

  NO = function() {
    return false;
  };

  THIS = function() {
    return this;
  };

  NEGATE = function() {
    this.negated = !this.negated;
    return this;
  };

  CALL_CONTINUATION = function() {
    return new Call(new Literal(tame["const"].k, []));
  };

  exports.Base = Base = (function() {

    function Base() {}

    Base.prototype.compile = function(o, lvl) {
      var node;
      o = extend({}, o);
      if (lvl) o.level = lvl;
      node = this.unfoldSoak(o) || this;
      node.tab = o.indent;
      if (node.needsCpsRotation() && !node.gotCpsSplit && node.isStatement(o)) {
        return node.compileCps(o);
      } else if (o.level === LEVEL_TOP || !node.isStatement(o)) {
        return node.compileNode(o);
      } else {
        return node.compileClosure(o);
      }
    };

    Base.prototype.compileClosure = function(o) {
      if (this.jumps() || this instanceof Throw) {
        throw SyntaxError('cannot use a pure statement in an expression.');
      }
      o.sharedScope = true;
      return Closure.wrap(this).compileNode(o);
    };

    Base.prototype.compileCps = function(o) {
      var node, ret;
      this.gotCpsSplit = true;
      node = CpsCascade.wrap(this, this.tameContinuationBlock);
      ret = node.compile(o);
      return ret;
    };

    Base.prototype.cache = function(o, level, reused) {
      var ref, sub;
      if (!this.isComplex()) {
        ref = level ? this.compile(o, level) : this;
        return [ref, ref];
      } else {
        ref = new Literal(reused || o.scope.freeVariable('ref'));
        sub = new Assign(ref, this);
        if (level) {
          return [sub.compile(o, level), ref.value];
        } else {
          return [sub, ref];
        }
      }
    };

    Base.prototype.compileLoopReference = function(o, name) {
      var src, tmp;
      src = tmp = this.compile(o, LEVEL_LIST);
      if (!((-Infinity < +src && +src < Infinity) || IDENTIFIER.test(src) && o.scope.check(src, true))) {
        src = "" + (tmp = o.scope.freeVariable(name)) + " = " + src;
      }
      return [src, tmp];
    };

    Base.prototype.makeReturn = function(res) {
      var me;
      me = this.unwrapAll();
      if (res) {
        return new Call(new Literal("" + res + ".push"), [me]);
      } else {
        return new Return(me);
      }
    };

    Base.prototype.contains = function(pred) {
      var contains;
      contains = false;
      this.traverseChildren(false, function(node) {
        if (pred(node)) {
          contains = true;
          return false;
        }
      });
      return contains;
    };

    Base.prototype.containsType = function(type) {
      return this instanceof type || this.contains(function(node) {
        return node instanceof type;
      });
    };

    Base.prototype.lastNonComment = function(list) {
      var i;
      i = list.length;
      while (i--) {
        if (!(list[i] instanceof Comment)) return list[i];
      }
      return null;
    };

    Base.prototype.toString = function(idt, name) {
      var extras, tree;
      if (idt == null) idt = '';
      if (name == null) name = this.constructor.name;
      extras = "";
      if (this.tameNodeFlag) extras += "T";
      if (this.cpsNodeFlag) extras += "C";
      if (extras.length) extras = " (" + extras + ")";
      tree = '\n' + idt + name;
      if (this.soak) tree += '?';
      tree += extras;
      this.eachChild(function(node) {
        return tree += node.toString(idt + TAB);
      });
      if (this.tameContinuationBlock) {
        idt += TAB;
        tree += '\n' + idt + "Continuation";
        tree += this.tameContinuationBlock.toString(idt + TAB);
      }
      return tree;
    };

    Base.prototype.eachChild = function(func) {
      var attr, child, _i, _j, _len, _len2, _ref2, _ref3;
      if (!this.children) return this;
      _ref2 = this.children;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        attr = _ref2[_i];
        if (this[attr]) {
          _ref3 = flatten([this[attr]]);
          for (_j = 0, _len2 = _ref3.length; _j < _len2; _j++) {
            child = _ref3[_j];
            if (func(child) === false) return this;
          }
        }
      }
      return this;
    };

    Base.prototype.traverseChildren = function(crossScope, func) {
      return this.eachChild(function(child) {
        if (func(child) === false) return false;
        return child.traverseChildren(crossScope, func);
      });
    };

    Base.prototype.invert = function() {
      return new Op('!', this);
    };

    Base.prototype.unwrapAll = function() {
      var node;
      node = this;
      while (node !== (node = node.unwrap())) {
        continue;
      }
      return node;
    };

    Base.prototype.flattenChildren = function() {
      var attr, child, out, _i, _j, _len, _len2, _ref2, _ref3;
      out = [];
      _ref2 = this.children;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        attr = _ref2[_i];
        if (this[attr]) {
          _ref3 = flatten([this[attr]]);
          for (_j = 0, _len2 = _ref3.length; _j < _len2; _j++) {
            child = _ref3[_j];
            out.push(child);
          }
        }
      }
      return out;
    };

    Base.prototype.walkAstTame = function() {
      var child, _i, _len, _ref2;
      _ref2 = this.flattenChildren();
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        child = _ref2[_i];
        if (child.walkAstTame()) this.tameNodeFlag = true;
      }
      return this.tameNodeFlag;
    };

    Base.prototype.walkAstCps = function(flood) {
      var child, _i, _len, _ref2;
      if (this.isLoop() && this.tameNodeFlag) flood = true;
      if (this.isAwait()) flood = false;
      this.cpsNodeFlag = flood;
      _ref2 = this.flattenChildren();
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        child = _ref2[_i];
        if (child.walkAstCps(flood)) this.cpsNodeFlag = true;
      }
      return this.cpsNodeFlag;
    };

    Base.prototype.children = [];

    Base.prototype.tameContinuationBlock = null;

    Base.prototype.cpsRotate = function() {
      var child, _i, _len, _ref2;
      _ref2 = this.flattenChildren();
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        child = _ref2[_i];
        child.cpsRotate();
      }
      return this;
    };

    Base.prototype.needsCpsRotation = function() {
      return this.tameNodeFlag || this.cpsNodeFlag;
    };

    Base.prototype.tameNestContinuationBlock = function(b) {
      return this.tameContinuationBlock = b;
    };

    Base.prototype.callContinuation = function() {};

    Base.prototype.isStatement = NO;

    Base.prototype.jumps = NO;

    Base.prototype.isComplex = YES;

    Base.prototype.isChainable = NO;

    Base.prototype.isAssignable = NO;

    Base.prototype.isControlBreak = NO;

    Base.prototype.isTamedFunc = NO;

    Base.prototype.isLoop = NO;

    Base.prototype.isAwait = NO;

    Base.prototype.cpsNodeFlag = false;

    Base.prototype.tameNodeFlag = false;

    Base.prototype.gotCpsSplit = false;

    Base.prototype.unwrap = THIS;

    Base.prototype.unfoldSoak = NO;

    Base.prototype.assigns = NO;

    return Base;

  })();

  exports.Block = Block = (function() {

    __extends(Block, Base);

    function Block(nodes) {
      this.expressions = compact(flatten(nodes || []));
    }

    Block.prototype.children = ['expressions'];

    Block.prototype.push = function(node) {
      this.expressions.push(node);
      return this;
    };

    Block.prototype.pop = function() {
      return this.expressions.pop();
    };

    Block.prototype.unshift = function(node) {
      this.expressions.unshift(node);
      return this;
    };

    Block.prototype.unwrap = function() {
      if (this.expressions.length === 1) {
        return this.expressions[0];
      } else {
        return this;
      }
    };

    Block.prototype.isEmpty = function() {
      return !this.expressions.length;
    };

    Block.prototype.isStatement = function(o) {
      var exp, _i, _len, _ref2;
      _ref2 = this.expressions;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        exp = _ref2[_i];
        if (exp.isStatement(o)) return true;
      }
      return false;
    };

    Block.prototype.jumps = function(o) {
      var exp, _i, _len, _ref2;
      _ref2 = this.expressions;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        exp = _ref2[_i];
        if (exp.jumps(o)) return exp;
      }
    };

    Block.prototype.makeReturn = function(res) {
      var expr, len;
      len = this.expressions.length;
      while (len--) {
        expr = this.expressions[len];
        if (!(expr instanceof Comment)) {
          this.expressions[len] = expr.makeReturn(res);
          if (expr instanceof Return && !expr.expression) {
            this.expressions.splice(len, 1);
          }
          break;
        }
      }
      return this;
    };

    Block.prototype.compileCps = function(o) {
      this.gotCpsSplit = true;
      if (this.expressions.length > 1) {
        return Block.__super__.compileCps.call(this, o);
      } else {
        return this.compileNode(o);
      }
    };

    Block.prototype.compile = function(o, level) {
      if (o == null) o = {};
      if (o.scope) {
        return Block.__super__.compile.call(this, o, level);
      } else {
        return this.compileRoot(o);
      }
    };

    Block.prototype.compileNode = function(o) {
      var code, codes, node, top, _i, _len, _ref2;
      this.tab = o.indent;
      top = o.level === LEVEL_TOP;
      codes = [];
      _ref2 = this.expressions;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        node = _ref2[_i];
        node = node.unwrapAll();
        node = node.unfoldSoak(o) || node;
        if (node instanceof Block) {
          codes.push(node.compileNode(o));
        } else if (top) {
          node.front = true;
          code = node.compile(o);
          codes.push(node.isStatement(o) ? code : "" + this.tab + code + ";");
        } else {
          codes.push(node.compile(o, LEVEL_LIST));
        }
      }
      if (top) {
        if (this.spaced) {
          return '\n' + codes.join('\n\n') + '\n';
        } else {
          return codes.join('\n');
        }
      }
      code = codes.join(', ') || 'void 0';
      if (codes.length > 1 && o.level >= LEVEL_LIST) {
        return "(" + code + ")";
      } else {
        return code;
      }
    };

    Block.prototype.compileRoot = function(o) {
      var code;
      o.indent = this.tab = o.bare ? '' : TAB;
      o.scope = new Scope(null, this, null);
      o.level = LEVEL_TOP;
      this.spaced = true;
      code = this.compileWithDeclarations(o);
      if (o.bare || o.scope.variables.length <= 1) return code;
      return "(function() {\n" + code + "\n}).call(this);\n";
    };

    Block.prototype.compileWithDeclarations = function(o) {
      var assigns, code, declars, exp, i, post, rest, scope, _len, _ref2;
      code = post = '';
      _ref2 = this.expressions;
      for (i = 0, _len = _ref2.length; i < _len; i++) {
        exp = _ref2[i];
        exp = exp.unwrap();
        if (!(exp instanceof Comment || exp instanceof Literal)) break;
      }
      o = merge(o, {
        level: LEVEL_TOP
      });
      if (i) {
        rest = this.expressions.splice(i, this.expressions.length);
        code = this.compileNode(o);
        this.expressions = rest;
      }
      post = this.compileNode(o);
      scope = o.scope;
      if (scope.expressions === this) {
        declars = o.scope.hasDeclarations();
        assigns = scope.hasAssignments;
        if ((declars || assigns) && i) code += '\n';
        if (declars) {
          code += "" + this.tab + "var " + (scope.declaredVariables().join(', ')) + ";\n";
        }
        if (assigns) {
          code += "" + this.tab + "var " + (multident(scope.assignedVariables().join(', '), this.tab)) + ";\n";
        }
      }
      return code + post;
    };

    Block.prototype.cpsRotate = function() {
      var child, e, i, pivot, rest, _i, _j, _len, _len2, _ref2;
      pivot = null;
      child = null;
      if (this.needsCpsRotation()) {
        i = 0;
        _ref2 = this.expressions;
        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
          e = _ref2[_i];
          if (e.needsCpsRotation()) {
            pivot = e;
            break;
          }
          i++;
        }
      }
      if (pivot) {
        rest = this.expressions.slice(i + 1);
        this.expressions = this.expressions.slice(0, i + 1);
        if (rest.length) {
          child = new Block(rest);
          pivot.tameNestContinuationBlock(child);
          for (_j = 0, _len2 = rest.length; _j < _len2; _j++) {
            e = rest[_j];
            if (e.tameNodeFlag) child.tameNodeFlag = true;
            if (e.cpsNodeFlag) child.cpsNodeFlag = true;
          }
          child.cpsRotate();
        }
        pivot.callContinuation();
      }
      Block.__super__.cpsRotate.call(this);
      return this;
    };

    Block.prototype.addCpsChain = function() {
      return this.expressions.push(new Call(new Literal(tame["const"].k, [])));
    };

    Block.wrap = function(nodes) {
      if (nodes.length === 1 && nodes[0] instanceof Block) return nodes[0];
      return new Block(nodes);
    };

    Block.prototype.tameTransform = function() {
      this.walkAstTame();
      this.walkAstCps(false);
      return this.cpsRotate();
    };

    return Block;

  })();

  exports.Literal = Literal = (function() {

    __extends(Literal, Base);

    function Literal(value) {
      this.value = value;
    }

    Literal.prototype.makeReturn = function() {
      if (this.isStatement()) {
        return this;
      } else {
        return Literal.__super__.makeReturn.apply(this, arguments);
      }
    };

    Literal.prototype.isAssignable = function() {
      return IDENTIFIER.test(this.value);
    };

    Literal.prototype.isStatement = function() {
      var _ref2;
      return (_ref2 = this.value) === 'break' || _ref2 === 'continue' || _ref2 === 'debugger';
    };

    Literal.prototype.isComplex = NO;

    Literal.prototype.assigns = function(name) {
      return name === this.value;
    };

    Literal.prototype.jumps = function(o) {
      if (!this.isStatement()) return false;
      if (!(o && (o.loop || o.block && (this.value !== 'continue')))) {
        return this;
      } else {
        return false;
      }
    };

    Literal.prototype.compileNode = function(o) {
      var code, _ref2, _ref3;
      code = this.isUndefined ? o.level >= LEVEL_ACCESS ? '(void 0)' : 'void 0' : this.value === 'this' ? ((_ref2 = o.scope.method) != null ? _ref2.bound : void 0) ? o.scope.method.context : this.value : this.value.reserved && ((_ref3 = "" + this.value) !== 'eval' && _ref3 !== 'arguments') ? "\"" + this.value + "\"" : this.value;
      if (this.isStatement()) {
        return "" + this.tab + code + ";";
      } else {
        return code;
      }
    };

    Literal.prototype.toString = function() {
      return ' "' + this.value + '"';
    };

    return Literal;

  })();

  exports.Return = Return = (function() {

    __extends(Return, Base);

    function Return(expr) {
      if (expr && !expr.unwrap().isUndefined) this.expression = expr;
    }

    Return.prototype.children = ['expression'];

    Return.prototype.isStatement = YES;

    Return.prototype.makeReturn = THIS;

    Return.prototype.jumps = THIS;

    Return.prototype.compile = function(o, level) {
      var expr, _ref2;
      expr = (_ref2 = this.expression) != null ? _ref2.makeReturn() : void 0;
      if (expr && !(expr instanceof Return)) {
        return expr.compile(o, level);
      } else {
        return Return.__super__.compile.call(this, o, level);
      }
    };

    Return.prototype.compileNode = function(o) {
      return this.tab + ("return" + [this.expression ? " " + (this.expression.compile(o, LEVEL_PAREN)) : void 0] + ";");
    };

    return Return;

  })();

  exports.Value = Value = (function() {

    __extends(Value, Base);

    function Value(base, props, tag) {
      if (!props && base instanceof Value) return base;
      this.base = base;
      this.properties = props || [];
      if (tag) this[tag] = true;
      return this;
    }

    Value.prototype.children = ['base', 'properties'];

    Value.prototype.add = function(props) {
      this.properties = this.properties.concat(props);
      return this;
    };

    Value.prototype.hasProperties = function() {
      return !!this.properties.length;
    };

    Value.prototype.isArray = function() {
      return !this.properties.length && this.base instanceof Arr;
    };

    Value.prototype.isComplex = function() {
      return this.hasProperties() || this.base.isComplex();
    };

    Value.prototype.isAssignable = function() {
      return this.hasProperties() || this.base.isAssignable();
    };

    Value.prototype.isSimpleNumber = function() {
      return this.base instanceof Literal && SIMPLENUM.test(this.base.value);
    };

    Value.prototype.isAtomic = function() {
      var node, _i, _len, _ref2;
      _ref2 = this.properties.concat(this.base);
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        node = _ref2[_i];
        if (node.soak || node instanceof Call) return false;
      }
      return true;
    };

    Value.prototype.isStatement = function(o) {
      return !this.properties.length && this.base.isStatement(o);
    };

    Value.prototype.assigns = function(name) {
      return !this.properties.length && this.base.assigns(name);
    };

    Value.prototype.jumps = function(o) {
      return !this.properties.length && this.base.jumps(o);
    };

    Value.prototype.isObject = function(onlyGenerated) {
      if (this.properties.length) return false;
      return (this.base instanceof Obj) && (!onlyGenerated || this.base.generated);
    };

    Value.prototype.isSplice = function() {
      return last(this.properties) instanceof Slice;
    };

    Value.prototype.unwrap = function() {
      if (this.properties.length) {
        return this;
      } else {
        return this.base;
      }
    };

    Value.prototype.cacheReference = function(o) {
      var base, bref, name, nref;
      name = last(this.properties);
      if (this.properties.length < 2 && !this.base.isComplex() && !(name != null ? name.isComplex() : void 0)) {
        return [this, this];
      }
      base = new Value(this.base, this.properties.slice(0, -1));
      if (base.isComplex()) {
        bref = new Literal(o.scope.freeVariable('base'));
        base = new Value(new Parens(new Assign(bref, base)));
      }
      if (!name) return [base, bref];
      if (name.isComplex()) {
        nref = new Literal(o.scope.freeVariable('name'));
        name = new Index(new Assign(nref, name.index));
        nref = new Index(nref);
      }
      return [base.add(name), new Value(bref || base.base, [nref || name])];
    };

    Value.prototype.compileNode = function(o) {
      var code, prop, props, _i, _len;
      this.base.front = this.front;
      props = this.properties;
      code = this.base.compile(o, props.length ? LEVEL_ACCESS : null);
      if ((this.base instanceof Parens || props.length) && SIMPLENUM.test(code)) {
        code = "" + code + ".";
      }
      for (_i = 0, _len = props.length; _i < _len; _i++) {
        prop = props[_i];
        code += prop.compile(o);
      }
      return code;
    };

    Value.prototype.unfoldSoak = function(o) {
      var result;
      var _this = this;
      if (this.unfoldedSoak != null) return this.unfoldedSoak;
      result = (function() {
        var fst, i, ifn, prop, ref, snd, _len, _ref2;
        if (ifn = _this.base.unfoldSoak(o)) {
          Array.prototype.push.apply(ifn.body.properties, _this.properties);
          return ifn;
        }
        _ref2 = _this.properties;
        for (i = 0, _len = _ref2.length; i < _len; i++) {
          prop = _ref2[i];
          if (!prop.soak) continue;
          prop.soak = false;
          fst = new Value(_this.base, _this.properties.slice(0, i));
          snd = new Value(_this.base, _this.properties.slice(i));
          if (fst.isComplex()) {
            ref = new Literal(o.scope.freeVariable('ref'));
            fst = new Parens(new Assign(ref, fst));
            snd.base = ref;
          }
          return new If(new Existence(fst), snd, {
            soak: true
          });
        }
        return null;
      })();
      return this.unfoldedSoak = result || false;
    };

    return Value;

  })();

  exports.Comment = Comment = (function() {

    __extends(Comment, Base);

    function Comment(comment) {
      this.comment = comment;
    }

    Comment.prototype.isStatement = YES;

    Comment.prototype.makeReturn = THIS;

    Comment.prototype.compileNode = function(o, level) {
      var code;
      code = '/*' + multident(this.comment, this.tab) + ("\n" + this.tab + "*/");
      if ((level || o.level) === LEVEL_TOP) code = o.indent + code;
      return code;
    };

    return Comment;

  })();

  exports.Call = Call = (function() {

    __extends(Call, Base);

    function Call(variable, args, soak) {
      this.args = args != null ? args : [];
      this.soak = soak;
      this.isNew = false;
      this.isSuper = variable === 'super';
      this.variable = this.isSuper ? null : variable;
    }

    Call.prototype.children = ['variable', 'args'];

    Call.prototype.newInstance = function() {
      var base, _ref2;
      base = ((_ref2 = this.variable) != null ? _ref2.base : void 0) || this.variable;
      if (base instanceof Call && !base.isNew) {
        base.newInstance();
      } else {
        this.isNew = true;
      }
      return this;
    };

    Call.prototype.superReference = function(o) {
      var accesses, method, name;
      method = o.scope.method;
      if (!method) throw SyntaxError('cannot call super outside of a function.');
      name = method.name;
      if (name == null) {
        throw SyntaxError('cannot call super on an anonymous function.');
      }
      if (method.klass) {
        accesses = [new Access(new Literal('__super__'))];
        if (method.static) accesses.push(new Access(new Literal('constructor')));
        accesses.push(new Access(new Literal(name)));
        return (new Value(new Literal(method.klass), accesses)).compile(o);
      } else {
        return "" + name + ".__super__.constructor";
      }
    };

    Call.prototype.unfoldSoak = function(o) {
      var call, ifn, left, list, rite, _i, _len, _ref2, _ref3;
      if (this.soak) {
        if (this.variable) {
          if (ifn = unfoldSoak(o, this, 'variable')) return ifn;
          _ref2 = new Value(this.variable).cacheReference(o), left = _ref2[0], rite = _ref2[1];
        } else {
          left = new Literal(this.superReference(o));
          rite = new Value(left);
        }
        rite = new Call(rite, this.args);
        rite.isNew = this.isNew;
        left = new Literal("typeof " + (left.compile(o)) + " === \"function\"");
        return new If(left, new Value(rite), {
          soak: true
        });
      }
      call = this;
      list = [];
      while (true) {
        if (call.variable instanceof Call) {
          list.push(call);
          call = call.variable;
          continue;
        }
        if (!(call.variable instanceof Value)) break;
        list.push(call);
        if (!((call = call.variable.base) instanceof Call)) break;
      }
      _ref3 = list.reverse();
      for (_i = 0, _len = _ref3.length; _i < _len; _i++) {
        call = _ref3[_i];
        if (ifn) {
          if (call.variable instanceof Call) {
            call.variable = ifn;
          } else {
            call.variable.base = ifn;
          }
        }
        ifn = unfoldSoak(o, call, 'variable');
      }
      return ifn;
    };

    Call.prototype.filterImplicitObjects = function(list) {
      var node, nodes, obj, prop, properties, _i, _j, _len, _len2, _ref2;
      nodes = [];
      for (_i = 0, _len = list.length; _i < _len; _i++) {
        node = list[_i];
        if (!((typeof node.isObject === "function" ? node.isObject() : void 0) && node.base.generated)) {
          nodes.push(node);
          continue;
        }
        obj = null;
        _ref2 = node.base.properties;
        for (_j = 0, _len2 = _ref2.length; _j < _len2; _j++) {
          prop = _ref2[_j];
          if (prop instanceof Assign || prop instanceof Comment) {
            if (!obj) nodes.push(obj = new Obj(properties = [], true));
            properties.push(prop);
          } else {
            nodes.push(prop);
            obj = null;
          }
        }
      }
      return nodes;
    };

    Call.prototype.compileNode = function(o) {
      var arg, args, code, _ref2;
      if ((_ref2 = this.variable) != null) _ref2.front = this.front;
      if (code = Splat.compileSplattedArray(o, this.args, true)) {
        return this.compileSplat(o, code);
      }
      args = this.filterImplicitObjects(this.args);
      args = ((function() {
        var _i, _len, _results;
        _results = [];
        for (_i = 0, _len = args.length; _i < _len; _i++) {
          arg = args[_i];
          _results.push(arg.compile(o, LEVEL_LIST));
        }
        return _results;
      })()).join(', ');
      if (this.isSuper) {
        return this.superReference(o) + (".call(this" + (args && ', ' + args) + ")");
      } else {
        return (this.isNew ? 'new ' : '') + this.variable.compile(o, LEVEL_ACCESS) + ("(" + args + ")");
      }
    };

    Call.prototype.compileSuper = function(args, o) {
      return "" + (this.superReference(o)) + ".call(this" + (args.length ? ', ' : '') + args + ")";
    };

    Call.prototype.compileSplat = function(o, splatArgs) {
      var base, fun, idt, name, ref;
      if (this.isSuper) {
        return "" + (this.superReference(o)) + ".apply(this, " + splatArgs + ")";
      }
      if (this.isNew) {
        idt = this.tab + TAB;
        return "(function(func, args, ctor) {\n" + idt + "ctor.prototype = func.prototype;\n" + idt + "var child = new ctor, result = func.apply(child, args);\n" + idt + "return typeof result === \"object\" ? result : child;\n" + this.tab + "})(" + (this.variable.compile(o, LEVEL_LIST)) + ", " + splatArgs + ", function() {})";
      }
      base = new Value(this.variable);
      if ((name = base.properties.pop()) && base.isComplex()) {
        ref = o.scope.freeVariable('ref');
        fun = "(" + ref + " = " + (base.compile(o, LEVEL_LIST)) + ")" + (name.compile(o));
      } else {
        fun = base.compile(o, LEVEL_ACCESS);
        if (SIMPLENUM.test(fun)) fun = "(" + fun + ")";
        if (name) {
          ref = fun;
          fun += name.compile(o);
        } else {
          ref = 'null';
        }
      }
      return "" + fun + ".apply(" + ref + ", " + splatArgs + ")";
    };

    return Call;

  })();

  exports.Extends = Extends = (function() {

    __extends(Extends, Base);

    function Extends(child, parent) {
      this.child = child;
      this.parent = parent;
    }

    Extends.prototype.children = ['child', 'parent'];

    Extends.prototype.compile = function(o) {
      return new Call(new Value(new Literal(utility('extends'))), [this.child, this.parent]).compile(o);
    };

    return Extends;

  })();

  exports.Access = Access = (function() {

    __extends(Access, Base);

    function Access(name, tag) {
      this.name = name;
      this.name.asKey = true;
      this.soak = tag === 'soak';
    }

    Access.prototype.children = ['name'];

    Access.prototype.compile = function(o) {
      var name;
      name = this.name.compile(o);
      if (IDENTIFIER.test(name)) {
        return "." + name;
      } else {
        return "[" + name + "]";
      }
    };

    Access.prototype.isComplex = NO;

    return Access;

  })();

  exports.Index = Index = (function() {

    __extends(Index, Base);

    function Index(index) {
      this.index = index;
    }

    Index.prototype.children = ['index'];

    Index.prototype.compile = function(o) {
      return "[" + (this.index.compile(o, LEVEL_PAREN)) + "]";
    };

    Index.prototype.isComplex = function() {
      return this.index.isComplex();
    };

    return Index;

  })();

  exports.Range = Range = (function() {

    __extends(Range, Base);

    Range.prototype.children = ['from', 'to'];

    function Range(from, to, tag) {
      this.from = from;
      this.to = to;
      this.exclusive = tag === 'exclusive';
      this.equals = this.exclusive ? '' : '=';
    }

    Range.prototype.compileVariables = function(o) {
      var step, _ref2, _ref3, _ref4, _ref5;
      o = merge(o, {
        top: true
      });
      _ref2 = this.from.cache(o, LEVEL_LIST), this.fromC = _ref2[0], this.fromVar = _ref2[1];
      _ref3 = this.to.cache(o, LEVEL_LIST), this.toC = _ref3[0], this.toVar = _ref3[1];
      if (step = del(o, 'step')) {
        _ref4 = step.cache(o, LEVEL_LIST), this.step = _ref4[0], this.stepVar = _ref4[1];
      }
      _ref5 = [this.fromVar.match(SIMPLENUM), this.toVar.match(SIMPLENUM)], this.fromNum = _ref5[0], this.toNum = _ref5[1];
      if (this.stepVar) return this.stepNum = this.stepVar.match(SIMPLENUM);
    };

    Range.prototype.compileNode = function(o) {
      var cond, condPart, from, gt, idx, known, lt, stepPart, to, varPart, _ref2, _ref3;
      if (!this.fromVar) this.compileVariables(o);
      if (!o.index) return this.compileArray(o);
      known = this.fromNum && this.toNum;
      idx = del(o, 'index');
      varPart = "" + idx + " = " + this.fromC;
      if (this.toC !== this.toVar) varPart += ", " + this.toC;
      if (this.step !== this.stepVar) varPart += ", " + this.step;
      _ref2 = ["" + idx + " <" + this.equals, "" + idx + " >" + this.equals], lt = _ref2[0], gt = _ref2[1];
      condPart = this.stepNum ? +this.stepNum > 0 ? "" + lt + " " + this.toVar : "" + gt + " " + this.toVar : known ? ((_ref3 = [+this.fromNum, +this.toNum], from = _ref3[0], to = _ref3[1], _ref3), from <= to ? "" + lt + " " + to : "" + gt + " " + to) : (cond = "" + this.fromVar + " <= " + this.toVar, "" + cond + " ? " + lt + " " + this.toVar + " : " + gt + " " + this.toVar);
      stepPart = this.stepVar ? "" + idx + " += " + this.stepVar : known ? from <= to ? "" + idx + "++" : "" + idx + "--" : "" + cond + " ? " + idx + "++ : " + idx + "--";
      return "" + varPart + "; " + condPart + "; " + stepPart;
    };

    Range.prototype.compileArray = function(o) {
      var args, body, cond, hasArgs, i, idt, post, pre, range, result, vars, _i, _ref2, _ref3, _results;
      if (this.fromNum && this.toNum && Math.abs(this.fromNum - this.toNum) <= 20) {
        range = (function() {
          _results = [];
          for (var _i = _ref2 = +this.fromNum, _ref3 = +this.toNum; _ref2 <= _ref3 ? _i <= _ref3 : _i >= _ref3; _ref2 <= _ref3 ? _i++ : _i--){ _results.push(_i); }
          return _results;
        }).apply(this);
        if (this.exclusive) range.pop();
        return "[" + (range.join(', ')) + "]";
      }
      idt = this.tab + TAB;
      i = o.scope.freeVariable('i');
      result = o.scope.freeVariable('results');
      pre = "\n" + idt + result + " = [];";
      if (this.fromNum && this.toNum) {
        o.index = i;
        body = this.compileNode(o);
      } else {
        vars = ("" + i + " = " + this.fromC) + (this.toC !== this.toVar ? ", " + this.toC : '');
        cond = "" + this.fromVar + " <= " + this.toVar;
        body = "var " + vars + "; " + cond + " ? " + i + " <" + this.equals + " " + this.toVar + " : " + i + " >" + this.equals + " " + this.toVar + "; " + cond + " ? " + i + "++ : " + i + "--";
      }
      post = "{ " + result + ".push(" + i + "); }\n" + idt + "return " + result + ";\n" + o.indent;
      hasArgs = function(node) {
        return node != null ? node.contains(function(n) {
          return n instanceof Literal && n.value === 'arguments' && !n.asKey;
        }) : void 0;
      };
      if (hasArgs(this.from) || hasArgs(this.to)) args = ', arguments';
      return "(function() {" + pre + "\n" + idt + "for (" + body + ")" + post + "}).apply(this" + (args != null ? args : '') + ")";
    };

    return Range;

  })();

  exports.Slice = Slice = (function() {

    __extends(Slice, Base);

    Slice.prototype.children = ['range'];

    function Slice(range) {
      this.range = range;
      Slice.__super__.constructor.call(this);
    }

    Slice.prototype.compileNode = function(o) {
      var compiled, from, fromStr, to, toStr, _ref2;
      _ref2 = this.range, to = _ref2.to, from = _ref2.from;
      fromStr = from && from.compile(o, LEVEL_PAREN) || '0';
      compiled = to && to.compile(o, LEVEL_ACCESS);
      if (to && !(!this.range.exclusive && +compiled === -1)) {
        toStr = ', ' + (this.range.exclusive ? compiled : SIMPLENUM.test(compiled) ? (+compiled + 1).toString() : "" + compiled + " + 1 || 9e9");
      }
      return ".slice(" + fromStr + (toStr || '') + ")";
    };

    return Slice;

  })();

  exports.Obj = Obj = (function() {

    __extends(Obj, Base);

    function Obj(props, generated) {
      this.generated = generated != null ? generated : false;
      this.objects = this.properties = props || [];
    }

    Obj.prototype.children = ['properties'];

    Obj.prototype.compileNode = function(o) {
      var i, idt, indent, join, lastNoncom, node, obj, prop, props, _i, _len;
      props = this.properties;
      if (!props.length) return (this.front ? '({})' : '{}');
      if (this.generated) {
        for (_i = 0, _len = props.length; _i < _len; _i++) {
          node = props[_i];
          if (node instanceof Value) {
            throw new Error('cannot have an implicit value in an implicit object');
          }
        }
      }
      idt = o.indent += TAB;
      lastNoncom = this.lastNonComment(this.properties);
      props = (function() {
        var _len2, _results;
        _results = [];
        for (i = 0, _len2 = props.length; i < _len2; i++) {
          prop = props[i];
          join = i === props.length - 1 ? '' : prop === lastNoncom || prop instanceof Comment ? '\n' : ',\n';
          indent = prop instanceof Comment ? '' : idt;
          if (prop instanceof Value && prop["this"]) {
            prop = new Assign(prop.properties[0].name, prop, 'object');
          }
          if (!(prop instanceof Comment)) {
            if (!(prop instanceof Assign)) prop = new Assign(prop, prop, 'object');
            (prop.variable.base || prop.variable).asKey = true;
          }
          _results.push(indent + prop.compile(o, LEVEL_TOP) + join);
        }
        return _results;
      })();
      props = props.join('');
      obj = "{" + (props && '\n' + props + '\n' + this.tab) + "}";
      if (this.front) {
        return "(" + obj + ")";
      } else {
        return obj;
      }
    };

    Obj.prototype.assigns = function(name) {
      var prop, _i, _len, _ref2;
      _ref2 = this.properties;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        prop = _ref2[_i];
        if (prop.assigns(name)) return true;
      }
      return false;
    };

    return Obj;

  })();

  exports.Arr = Arr = (function() {

    __extends(Arr, Base);

    function Arr(objs) {
      this.objects = objs || [];
    }

    Arr.prototype.children = ['objects'];

    Arr.prototype.filterImplicitObjects = Call.prototype.filterImplicitObjects;

    Arr.prototype.compileNode = function(o) {
      var code, obj, objs;
      if (!this.objects.length) return '[]';
      o.indent += TAB;
      objs = this.filterImplicitObjects(this.objects);
      if (code = Splat.compileSplattedArray(o, objs)) return code;
      code = ((function() {
        var _i, _len, _results;
        _results = [];
        for (_i = 0, _len = objs.length; _i < _len; _i++) {
          obj = objs[_i];
          _results.push(obj.compile(o, LEVEL_LIST));
        }
        return _results;
      })()).join(', ');
      if (code.indexOf('\n') >= 0) {
        return "[\n" + o.indent + code + "\n" + this.tab + "]";
      } else {
        return "[" + code + "]";
      }
    };

    Arr.prototype.assigns = function(name) {
      var obj, _i, _len, _ref2;
      _ref2 = this.objects;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        obj = _ref2[_i];
        if (obj.assigns(name)) return true;
      }
      return false;
    };

    return Arr;

  })();

  exports.Class = Class = (function() {

    __extends(Class, Base);

    function Class(variable, parent, body) {
      this.variable = variable;
      this.parent = parent;
      this.body = body != null ? body : new Block;
      this.boundFuncs = [];
      this.body.classBody = true;
    }

    Class.prototype.children = ['variable', 'parent', 'body'];

    Class.prototype.determineName = function() {
      var decl, tail;
      if (!this.variable) return null;
      decl = (tail = last(this.variable.properties)) ? tail instanceof Access && tail.name.value : this.variable.base.value;
      return decl && (decl = IDENTIFIER.test(decl) && decl);
    };

    Class.prototype.setContext = function(name) {
      return this.body.traverseChildren(false, function(node) {
        if (node.classBody) return false;
        if (node instanceof Literal && node.value === 'this') {
          return node.value = name;
        } else if (node instanceof Code) {
          node.klass = name;
          if (node.bound) return node.context = name;
        }
      });
    };

    Class.prototype.addBoundFunctions = function(o) {
      var bvar, lhs, _i, _len, _ref2, _results;
      if (this.boundFuncs.length) {
        _ref2 = this.boundFuncs;
        _results = [];
        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
          bvar = _ref2[_i];
          lhs = (new Value(new Literal("this"), [new Access(bvar)])).compile(o);
          _results.push(this.ctor.body.unshift(new Literal("" + lhs + " = " + (utility('bind')) + "(" + lhs + ", this)")));
        }
        return _results;
      }
    };

    Class.prototype.addProperties = function(node, name, o) {
      var assign, base, exprs, func, props;
      props = node.base.properties.slice(0);
      exprs = (function() {
        var _results;
        _results = [];
        while (assign = props.shift()) {
          if (assign instanceof Assign) {
            base = assign.variable.base;
            delete assign.context;
            func = assign.value;
            if (base.value === 'constructor') {
              if (this.ctor) {
                throw new Error('cannot define more than one constructor in a class');
              }
              if (func.bound) {
                throw new Error('cannot define a constructor as a bound function');
              }
              if (func instanceof Code) {
                assign = this.ctor = func;
              } else {
                this.externalCtor = o.scope.freeVariable('class');
                assign = new Assign(new Literal(this.externalCtor), func);
              }
            } else {
              if (assign.variable["this"]) {
                func.static = true;
              } else {
                assign.variable = new Value(new Literal(name), [new Access(new Literal('prototype')), new Access(base)]);
                if (func instanceof Code && func.bound) {
                  this.boundFuncs.push(base);
                  func.bound = false;
                }
              }
            }
          }
          _results.push(assign);
        }
        return _results;
      }).call(this);
      return compact(exprs);
    };

    Class.prototype.walkBody = function(name, o) {
      var _this = this;
      return this.traverseChildren(false, function(child) {
        var exps, i, node, _len, _ref2;
        if (child instanceof Class) return false;
        if (child instanceof Block) {
          _ref2 = exps = child.expressions;
          for (i = 0, _len = _ref2.length; i < _len; i++) {
            node = _ref2[i];
            if (node instanceof Value && node.isObject(true)) {
              exps[i] = _this.addProperties(node, name, o);
            }
          }
          return child.expressions = exps = flatten(exps);
        }
      });
    };

    Class.prototype.ensureConstructor = function(name) {
      if (!this.ctor) {
        this.ctor = new Code;
        if (this.parent) {
          this.ctor.body.push(new Literal("" + name + ".__super__.constructor.apply(this, arguments)"));
        }
        if (this.externalCtor) {
          this.ctor.body.push(new Literal("" + this.externalCtor + ".apply(this, arguments)"));
        }
        this.body.expressions.unshift(this.ctor);
      }
      this.ctor.ctor = this.ctor.name = name;
      this.ctor.klass = null;
      return this.ctor.noReturn = true;
    };

    Class.prototype.compileNode = function(o) {
      var decl, klass, lname, name;
      decl = this.determineName();
      name = decl || this.name || '_Class';
      if (name.reserved) name = "_" + name;
      lname = new Literal(name);
      this.setContext(name);
      this.walkBody(name, o);
      this.ensureConstructor(name);
      this.body.spaced = true;
      if (this.parent) {
        this.body.expressions.unshift(new Extends(lname, this.parent));
      }
      if (!(this.ctor instanceof Code)) this.body.expressions.unshift(this.ctor);
      this.body.expressions.push(lname);
      this.addBoundFunctions(o);
      klass = new Parens(Closure.wrap(this.body), true);
      if (this.variable) klass = new Assign(this.variable, klass);
      return klass.compile(o);
    };

    return Class;

  })();

  exports.Assign = Assign = (function() {

    __extends(Assign, Base);

    function Assign(variable, value, context, options) {
      this.variable = variable;
      this.value = value;
      this.context = context;
      this.param = options && options.param;
      this.subpattern = options && options.subpattern;
    }

    Assign.prototype.children = ['variable', 'value'];

    Assign.prototype.isStatement = function(o) {
      return (o != null ? o.level : void 0) === LEVEL_TOP && (this.context != null) && __indexOf.call(this.context, "?") >= 0;
    };

    Assign.prototype.assigns = function(name) {
      return this[this.context === 'object' ? 'value' : 'variable'].assigns(name);
    };

    Assign.prototype.unfoldSoak = function(o) {
      return unfoldSoak(o, this, 'variable');
    };

    Assign.prototype.compileNode = function(o) {
      var isValue, match, name, val, varBase, _ref2, _ref3, _ref4, _ref5;
      if (isValue = this.variable instanceof Value) {
        if (this.variable.isArray() || this.variable.isObject()) {
          return this.compilePatternMatch(o);
        }
        if (this.variable.isSplice()) return this.compileSplice(o);
        if ((_ref2 = this.context) === '||=' || _ref2 === '&&=' || _ref2 === '?=') {
          return this.compileConditional(o);
        }
      }
      name = this.variable.compile(o, LEVEL_LIST);
      if (!this.context) {
        if (!(varBase = this.variable.unwrapAll()).isAssignable()) {
          throw SyntaxError("\"" + (this.variable.compile(o)) + "\" cannot be assigned.");
        }
        if (!(typeof varBase.hasProperties === "function" ? varBase.hasProperties() : void 0)) {
          if (this.param) {
            o.scope.add(name, 'var');
          } else {
            o.scope.find(name);
          }
        }
      }
      if (this.value instanceof Code && (match = METHOD_DEF.exec(name))) {
        if (match[1]) this.value.klass = match[1];
        this.value.name = (_ref3 = (_ref4 = (_ref5 = match[2]) != null ? _ref5 : match[3]) != null ? _ref4 : match[4]) != null ? _ref3 : match[5];
      }
      val = this.value.compile(o, LEVEL_LIST);
      if (this.context === 'object') return "" + name + ": " + val;
      val = name + (" " + (this.context || '=') + " ") + val;
      if (o.level <= LEVEL_LIST) {
        return val;
      } else {
        return "(" + val + ")";
      }
    };

    Assign.prototype.compilePatternMatch = function(o) {
      var acc, assigns, code, i, idx, isObject, ivar, name, obj, objects, olen, ref, rest, splat, top, val, value, vvar, _len, _ref2, _ref3, _ref4, _ref5, _ref6, _ref7, _ref8;
      top = o.level === LEVEL_TOP;
      value = this.value;
      objects = this.variable.base.objects;
      if (!(olen = objects.length)) {
        code = value.compile(o);
        if (o.level >= LEVEL_OP) {
          return "(" + code + ")";
        } else {
          return code;
        }
      }
      isObject = this.variable.isObject();
      if (top && olen === 1 && !((obj = objects[0]) instanceof Splat)) {
        if (obj instanceof Assign) {
          _ref2 = obj, (_ref3 = _ref2.variable, idx = _ref3.base), obj = _ref2.value;
        } else {
          if (obj.base instanceof Parens) {
            _ref4 = new Value(obj.unwrapAll()).cacheReference(o), obj = _ref4[0], idx = _ref4[1];
          } else {
            idx = isObject ? obj["this"] ? obj.properties[0].name : obj : new Literal(0);
          }
        }
        acc = IDENTIFIER.test(idx.unwrap().value || 0);
        value = new Value(value);
        value.properties.push(new (acc ? Access : Index)(idx));
        if (_ref5 = obj.unwrap().value, __indexOf.call(['arguments', 'eval'].concat(RESERVED), _ref5) >= 0) {
          throw new SyntaxError("assignment to a reserved word: " + (obj.compile(o)) + " = " + (value.compile(o)));
        }
        return new Assign(obj, value, null, {
          param: this.param
        }).compile(o, LEVEL_TOP);
      }
      vvar = value.compile(o, LEVEL_LIST);
      assigns = [];
      splat = false;
      if (!IDENTIFIER.test(vvar) || this.variable.assigns(vvar)) {
        assigns.push("" + (ref = o.scope.freeVariable('ref')) + " = " + vvar);
        vvar = ref;
      }
      for (i = 0, _len = objects.length; i < _len; i++) {
        obj = objects[i];
        idx = i;
        if (isObject) {
          if (obj instanceof Assign) {
            _ref6 = obj, (_ref7 = _ref6.variable, idx = _ref7.base), obj = _ref6.value;
          } else {
            if (obj.base instanceof Parens) {
              _ref8 = new Value(obj.unwrapAll()).cacheReference(o), obj = _ref8[0], idx = _ref8[1];
            } else {
              idx = obj["this"] ? obj.properties[0].name : obj;
            }
          }
        }
        if (!splat && obj instanceof Splat) {
          name = obj.name.unwrap().value;
          obj = obj.unwrap();
          val = "" + olen + " <= " + vvar + ".length ? " + (utility('slice')) + ".call(" + vvar + ", " + i;
          if (rest = olen - i - 1) {
            ivar = o.scope.freeVariable('i');
            val += ", " + ivar + " = " + vvar + ".length - " + rest + ") : (" + ivar + " = " + i + ", [])";
          } else {
            val += ") : []";
          }
          val = new Literal(val);
          splat = "" + ivar + "++";
        } else {
          name = obj.unwrap().value;
          if (obj instanceof Splat) {
            obj = obj.name.compile(o);
            throw new SyntaxError("multiple splats are disallowed in an assignment: " + obj + "...");
          }
          if (typeof idx === 'number') {
            idx = new Literal(splat || idx);
            acc = false;
          } else {
            acc = isObject && IDENTIFIER.test(idx.unwrap().value || 0);
          }
          val = new Value(new Literal(vvar), [new (acc ? Access : Index)(idx)]);
        }
        if ((name != null) && __indexOf.call(['arguments', 'eval'].concat(RESERVED), name) >= 0) {
          throw new SyntaxError("assignment to a reserved word: " + (obj.compile(o)) + " = " + (val.compile(o)));
        }
        assigns.push(new Assign(obj, val, null, {
          param: this.param,
          subpattern: true
        }).compile(o, LEVEL_LIST));
      }
      if (!(top || this.subpattern)) assigns.push(vvar);
      code = assigns.join(', ');
      if (o.level < LEVEL_LIST) {
        return code;
      } else {
        return "(" + code + ")";
      }
    };

    Assign.prototype.compileConditional = function(o) {
      var left, rite, _ref2;
      _ref2 = this.variable.cacheReference(o), left = _ref2[0], rite = _ref2[1];
      if (__indexOf.call(this.context, "?") >= 0) o.isExistentialEquals = true;
      return new Op(this.context.slice(0, -1), left, new Assign(rite, this.value, '=')).compile(o);
    };

    Assign.prototype.compileSplice = function(o) {
      var code, exclusive, from, fromDecl, fromRef, name, to, valDef, valRef, _ref2, _ref3, _ref4;
      _ref2 = this.variable.properties.pop().range, from = _ref2.from, to = _ref2.to, exclusive = _ref2.exclusive;
      name = this.variable.compile(o);
      _ref3 = (from != null ? from.cache(o, LEVEL_OP) : void 0) || ['0', '0'], fromDecl = _ref3[0], fromRef = _ref3[1];
      if (to) {
        if ((from != null ? from.isSimpleNumber() : void 0) && to.isSimpleNumber()) {
          to = +to.compile(o) - +fromRef;
          if (!exclusive) to += 1;
        } else {
          to = to.compile(o, LEVEL_ACCESS) + ' - ' + fromRef;
          if (!exclusive) to += ' + 1';
        }
      } else {
        to = "9e9";
      }
      _ref4 = this.value.cache(o, LEVEL_LIST), valDef = _ref4[0], valRef = _ref4[1];
      code = "[].splice.apply(" + name + ", [" + fromDecl + ", " + to + "].concat(" + valDef + ")), " + valRef;
      if (o.level > LEVEL_TOP) {
        return "(" + code + ")";
      } else {
        return code;
      }
    };

    return Assign;

  })();

  exports.Code = Code = (function() {

    __extends(Code, Base);

    function Code(params, body, tag) {
      this.params = params || [];
      this.body = body || new Block;
      this.bound = tag === 'boundfunc';
      if (this.bound) this.context = '_this';
    }

    Code.prototype.children = ['params', 'body'];

    Code.prototype.isStatement = function() {
      return !!this.ctor;
    };

    Code.prototype.jumps = NO;

    Code.prototype.compileNode = function(o) {
      var code, exprs, i, idt, lit, p, param, ref, splats, v, val, vars, wasEmpty, _i, _j, _k, _len, _len2, _len3, _len4, _ref2, _ref3, _ref4, _ref5, _ref6;
      o.scope = new Scope(o.scope, this.body, this);
      o.scope.shared = del(o, 'sharedScope');
      o.indent += TAB;
      delete o.bare;
      vars = [];
      exprs = [];
      _ref2 = this.params;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        param = _ref2[_i];
        if (!param.splat) continue;
        _ref3 = this.params;
        for (_j = 0, _len2 = _ref3.length; _j < _len2; _j++) {
          p = _ref3[_j];
          if (p.name.value) o.scope.add(p.name.value, 'var', true);
        }
        splats = new Assign(new Value(new Arr((function() {
          var _k, _len3, _ref4, _results;
          _ref4 = this.params;
          _results = [];
          for (_k = 0, _len3 = _ref4.length; _k < _len3; _k++) {
            p = _ref4[_k];
            _results.push(p.asReference(o));
          }
          return _results;
        }).call(this))), new Value(new Literal('arguments')));
        break;
      }
      _ref4 = this.params;
      for (_k = 0, _len3 = _ref4.length; _k < _len3; _k++) {
        param = _ref4[_k];
        if (param.isComplex()) {
          val = ref = param.asReference(o);
          if (param.value) val = new Op('?', ref, param.value);
          exprs.push(new Assign(new Value(param.name), val, '=', {
            param: true
          }));
        } else {
          ref = param;
          if (param.value) {
            lit = new Literal(ref.name.value + ' == null');
            val = new Assign(new Value(param.name), param.value, '=');
            exprs.push(new If(lit, val));
          }
        }
        if (!splats) vars.push(ref);
      }
      wasEmpty = this.body.isEmpty();
      if (splats) exprs.unshift(splats);
      if (exprs.length) {
        (_ref5 = this.body.expressions).unshift.apply(_ref5, exprs);
      }
      if (!splats) {
        for (i = 0, _len4 = vars.length; i < _len4; i++) {
          v = vars[i];
          o.scope.parameter(vars[i] = v.compile(o));
        }
      }
      if (!(wasEmpty || this.noReturn)) this.body.makeReturn();
      if (this.bound) {
        if ((_ref6 = o.scope.parent.method) != null ? _ref6.bound : void 0) {
          this.bound = o.scope.parent.method.context;
        } else {
          o.scope.parent.assign('_this', 'this');
        }
      }
      idt = o.indent;
      code = 'function';
      if (this.ctor) code += ' ' + this.name;
      code += '(' + vars.join(', ') + ') {';
      if (this.tameNodeFlag) code += ' /* TAMED */ ';
      if (!this.body.isEmpty()) {
        code += "\n" + (this.body.compileWithDeclarations(o)) + "\n" + this.tab;
      }
      code += '}';
      if (this.ctor) return this.tab + code;
      if (this.front || (o.level >= LEVEL_ACCESS)) {
        return "(" + code + ")";
      } else {
        return code;
      }
    };

    Code.prototype.traverseChildren = function(crossScope, func) {
      if (crossScope) {
        return Code.__super__.traverseChildren.call(this, crossScope, func);
      }
    };

    Code.prototype.walkAstTame = function() {
      if (Code.__super__.walkAstTame.call(this)) this.tameNodeFlag = true;
      return false;
    };

    Code.prototype.walkAstCps = function(flood) {
      if (Code.__super__.walkAstCps.call(this, false)) this.cpsNodeFlag = true;
      return false;
    };

    return Code;

  })();

  exports.Param = Param = (function() {

    __extends(Param, Base);

    function Param(name, value, splat) {
      this.name = name;
      this.value = value;
      this.splat = splat;
    }

    Param.prototype.children = ['name', 'value'];

    Param.prototype.compile = function(o) {
      return this.name.compile(o, LEVEL_LIST);
    };

    Param.prototype.asReference = function(o) {
      var node;
      if (this.reference) return this.reference;
      node = this.name;
      if (node["this"]) {
        node = node.properties[0].name;
        if (node.value.reserved) node = new Literal('_' + node.value);
      } else if (node.isComplex()) {
        node = new Literal(o.scope.freeVariable('arg'));
      }
      node = new Value(node);
      if (this.splat) node = new Splat(node);
      return this.reference = node;
    };

    Param.prototype.isComplex = function() {
      return this.name.isComplex();
    };

    return Param;

  })();

  exports.Splat = Splat = (function() {

    __extends(Splat, Base);

    Splat.prototype.children = ['name'];

    Splat.prototype.isAssignable = YES;

    function Splat(name) {
      this.name = name.compile ? name : new Literal(name);
    }

    Splat.prototype.assigns = function(name) {
      return this.name.assigns(name);
    };

    Splat.prototype.compile = function(o) {
      if (this.index != null) {
        return this.compileParam(o);
      } else {
        return this.name.compile(o);
      }
    };

    Splat.prototype.unwrap = function() {
      return this.name;
    };

    Splat.compileSplattedArray = function(o, list, apply) {
      var args, base, code, i, index, node, _len;
      index = -1;
      while ((node = list[++index]) && !(node instanceof Splat)) {
        continue;
      }
      if (index >= list.length) return '';
      if (list.length === 1) {
        code = list[0].compile(o, LEVEL_LIST);
        if (apply) return code;
        return "" + (utility('slice')) + ".call(" + code + ")";
      }
      args = list.slice(index);
      for (i = 0, _len = args.length; i < _len; i++) {
        node = args[i];
        code = node.compile(o, LEVEL_LIST);
        args[i] = node instanceof Splat ? "" + (utility('slice')) + ".call(" + code + ")" : "[" + code + "]";
      }
      if (index === 0) {
        return args[0] + (".concat(" + (args.slice(1).join(', ')) + ")");
      }
      base = (function() {
        var _i, _len2, _ref2, _results;
        _ref2 = list.slice(0, index);
        _results = [];
        for (_i = 0, _len2 = _ref2.length; _i < _len2; _i++) {
          node = _ref2[_i];
          _results.push(node.compile(o, LEVEL_LIST));
        }
        return _results;
      })();
      return "[" + (base.join(', ')) + "].concat(" + (args.join(', ')) + ")";
    };

    return Splat;

  })();

  exports.While = While = (function() {

    __extends(While, Base);

    function While(condition, options) {
      this.condition = (options != null ? options.invert : void 0) ? condition.invert() : condition;
      this.guard = options != null ? options.guard : void 0;
    }

    While.prototype.children = ['condition', 'guard', 'body'];

    While.prototype.isStatement = YES;

    While.prototype.isLoop = YES;

    While.prototype.makeReturn = function(res) {
      if (res) {
        return While.__super__.makeReturn.apply(this, arguments);
      } else {
        this.returns = !this.jumps({
          loop: true
        });
        return this;
      }
    };

    While.prototype.addBody = function(body) {
      this.body = body;
      return this;
    };

    While.prototype.jumps = function() {
      var expressions, node, _i, _len;
      expressions = this.body.expressions;
      if (!expressions.length) return false;
      for (_i = 0, _len = expressions.length; _i < _len; _i++) {
        node = expressions[_i];
        if (node.jumps({
          loop: true
        })) return node;
      }
      return false;
    };

    While.prototype.callContinuation = function() {
      var k;
      k = new Call(new Literal(tame["const"].k_while, []));
      return this.body.push(k);
    };

    While.prototype.compileNode = function(o) {
      var body, code, rvar, set;
      o.indent += TAB;
      set = '';
      body = this.body;
      if (body.isEmpty()) {
        body = '';
      } else {
        if (this.returns) {
          body.makeReturn(rvar = o.scope.freeVariable('results'));
          set = "" + this.tab + rvar + " = [];\n";
        }
        if (this.guard) {
          if (body.expressions.length > 1) {
            body.expressions.unshift(new If((new Parens(this.guard)).invert(), new Literal("continue")));
          } else {
            if (this.guard) body = Block.wrap([new If(this.guard, body)]);
          }
        }
        body = "\n" + (body.compile(o, LEVEL_TOP)) + "\n" + this.tab;
      }
      code = set + this.tab + ("while (" + (this.condition.compile(o, LEVEL_PAREN)) + ") {" + body + "}");
      if (this.returns) code += "\n" + this.tab + "return " + rvar + ";";
      return code;
    };

    return While;

  })();

  exports.Op = Op = (function() {
    var CONVERSIONS, INVERSIONS;

    __extends(Op, Base);

    function Op(op, first, second, flip) {
      var call;
      if (op === 'in') return new In(first, second);
      if (op === 'do') {
        call = new Call(first, first.params || []);
        call["do"] = true;
        return call;
      }
      if (op === 'new') {
        if (first instanceof Call && !first["do"] && !first.isNew) {
          return first.newInstance();
        }
        if (first instanceof Code && first.bound || first["do"]) {
          first = new Parens(first);
        }
      }
      this.operator = CONVERSIONS[op] || op;
      this.first = first;
      this.second = second;
      this.flip = !!flip;
      return this;
    }

    CONVERSIONS = {
      '==': '===',
      '!=': '!==',
      'of': 'in'
    };

    INVERSIONS = {
      '!==': '===',
      '===': '!=='
    };

    Op.prototype.children = ['first', 'second'];

    Op.prototype.isSimpleNumber = NO;

    Op.prototype.isUnary = function() {
      return !this.second;
    };

    Op.prototype.isComplex = function() {
      var _ref2;
      return !(this.isUnary() && ((_ref2 = this.operator) === '+' || _ref2 === '-')) || this.first.isComplex();
    };

    Op.prototype.isChainable = function() {
      var _ref2;
      return (_ref2 = this.operator) === '<' || _ref2 === '>' || _ref2 === '>=' || _ref2 === '<=' || _ref2 === '===' || _ref2 === '!==';
    };

    Op.prototype.invert = function() {
      var allInvertable, curr, fst, op, _ref2;
      if (this.isChainable() && this.first.isChainable()) {
        allInvertable = true;
        curr = this;
        while (curr && curr.operator) {
          allInvertable && (allInvertable = curr.operator in INVERSIONS);
          curr = curr.first;
        }
        if (!allInvertable) return new Parens(this).invert();
        curr = this;
        while (curr && curr.operator) {
          curr.invert = !curr.invert;
          curr.operator = INVERSIONS[curr.operator];
          curr = curr.first;
        }
        return this;
      } else if (op = INVERSIONS[this.operator]) {
        this.operator = op;
        if (this.first.unwrap() instanceof Op) this.first.invert();
        return this;
      } else if (this.second) {
        return new Parens(this).invert();
      } else if (this.operator === '!' && (fst = this.first.unwrap()) instanceof Op && ((_ref2 = fst.operator) === '!' || _ref2 === 'in' || _ref2 === 'instanceof')) {
        return fst;
      } else {
        return new Op('!', this);
      }
    };

    Op.prototype.unfoldSoak = function(o) {
      var _ref2;
      return ((_ref2 = this.operator) === '++' || _ref2 === '--' || _ref2 === 'delete') && unfoldSoak(o, this, 'first');
    };

    Op.prototype.compileNode = function(o) {
      var code, isChain;
      isChain = this.isChainable() && this.first.isChainable();
      if (!isChain) this.first.front = this.front;
      if (this.isUnary()) return this.compileUnary(o);
      if (isChain) return this.compileChain(o);
      if (this.operator === '?') return this.compileExistence(o);
      code = this.first.compile(o, LEVEL_OP) + ' ' + this.operator + ' ' + this.second.compile(o, LEVEL_OP);
      if (o.level <= LEVEL_OP) {
        return code;
      } else {
        return "(" + code + ")";
      }
    };

    Op.prototype.compileChain = function(o) {
      var code, fst, shared, _ref2;
      _ref2 = this.first.second.cache(o), this.first.second = _ref2[0], shared = _ref2[1];
      fst = this.first.compile(o, LEVEL_OP);
      code = "" + fst + " " + (this.invert ? '&&' : '||') + " " + (shared.compile(o)) + " " + this.operator + " " + (this.second.compile(o, LEVEL_OP));
      return "(" + code + ")";
    };

    Op.prototype.compileExistence = function(o) {
      var fst, ref;
      if (this.first.isComplex()) {
        ref = new Literal(o.scope.freeVariable('ref'));
        fst = new Parens(new Assign(ref, this.first));
      } else {
        fst = this.first;
        ref = fst;
      }
      return new If(new Existence(fst), ref, {
        type: 'if'
      }).addElse(this.second).compile(o);
    };

    Op.prototype.compileUnary = function(o) {
      var op, parts, plusMinus;
      parts = [op = this.operator];
      plusMinus = op === '+' || op === '-';
      if ((op === 'new' || op === 'typeof' || op === 'delete') || plusMinus && this.first instanceof Op && this.first.operator === op) {
        parts.push(' ');
      }
      if ((plusMinus && this.first instanceof Op) || (op === 'new' && this.first.isStatement(o))) {
        this.first = new Parens(this.first);
      }
      parts.push(this.first.compile(o, LEVEL_OP));
      if (this.flip) parts.reverse();
      return parts.join('');
    };

    Op.prototype.toString = function(idt) {
      return Op.__super__.toString.call(this, idt, this.constructor.name + ' ' + this.operator);
    };

    return Op;

  })();

  exports.In = In = (function() {

    __extends(In, Base);

    function In(object, array) {
      this.object = object;
      this.array = array;
    }

    In.prototype.children = ['object', 'array'];

    In.prototype.invert = NEGATE;

    In.prototype.compileNode = function(o) {
      var hasSplat, obj, _i, _len, _ref2;
      if (this.array instanceof Value && this.array.isArray()) {
        _ref2 = this.array.base.objects;
        for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
          obj = _ref2[_i];
          if (!(obj instanceof Splat)) continue;
          hasSplat = true;
          break;
        }
        if (!hasSplat) return this.compileOrTest(o);
      }
      return this.compileLoopTest(o);
    };

    In.prototype.compileOrTest = function(o) {
      var cmp, cnj, i, item, ref, sub, tests, _ref2, _ref3;
      if (this.array.base.objects.length === 0) return "" + (!!this.negated);
      _ref2 = this.object.cache(o, LEVEL_OP), sub = _ref2[0], ref = _ref2[1];
      _ref3 = this.negated ? [' !== ', ' && '] : [' === ', ' || '], cmp = _ref3[0], cnj = _ref3[1];
      tests = (function() {
        var _len, _ref4, _results;
        _ref4 = this.array.base.objects;
        _results = [];
        for (i = 0, _len = _ref4.length; i < _len; i++) {
          item = _ref4[i];
          _results.push((i ? ref : sub) + cmp + item.compile(o, LEVEL_ACCESS));
        }
        return _results;
      }).call(this);
      tests = tests.join(cnj);
      if (o.level < LEVEL_OP) {
        return tests;
      } else {
        return "(" + tests + ")";
      }
    };

    In.prototype.compileLoopTest = function(o) {
      var code, ref, sub, _ref2;
      _ref2 = this.object.cache(o, LEVEL_LIST), sub = _ref2[0], ref = _ref2[1];
      code = utility('indexOf') + (".call(" + (this.array.compile(o, LEVEL_LIST)) + ", " + ref + ") ") + (this.negated ? '< 0' : '>= 0');
      if (sub === ref) return code;
      code = sub + ', ' + code;
      if (o.level < LEVEL_LIST) {
        return code;
      } else {
        return "(" + code + ")";
      }
    };

    In.prototype.toString = function(idt) {
      return In.__super__.toString.call(this, idt, this.constructor.name + (this.negated ? '!' : ''));
    };

    return In;

  })();

  exports.Await = Await = (function() {

    __extends(Await, Base);

    function Await(body) {
      var assign, call, cls, lhs, meth, rhs;
      lhs = new Value(new Literal(tame["const"].deferrals));
      cls = new Value(new Literal(tame["const"].ns));
      cls.add(new Access(new Value(new Literal(tame["const"].Deferrals))));
      call = new Call(cls, [new Value(new Literal(tame["const"].k))]);
      rhs = new Op("new", call);
      assign = new Assign(lhs, rhs);
      body.unshift(assign);
      meth = lhs.add(new Access(new Value(new Literal(tame["const"].fulfill))));
      call = new Call(meth, []);
      body.push(call);
      this.body = body;
    }

    Await.prototype.children = ['body'];

    Await.prototype.isStatement = YES;

    Await.prototype.isAwait = YES;

    Await.prototype.makeReturn = THIS;

    Await.prototype.compileNode = function(o) {
      o.indent += TAB;
      return this.body.compile(o);
    };

    Await.prototype.walkAstTame = function() {
      Await.__super__.walkAstTame.call(this);
      return this.tameNodeFlag = true;
    };

    return Await;

  })();

  exports.Try = Try = (function() {

    __extends(Try, Base);

    function Try(attempt, error, recovery, ensure) {
      this.attempt = attempt;
      this.error = error;
      this.recovery = recovery;
      this.ensure = ensure;
    }

    Try.prototype.children = ['attempt', 'recovery', 'ensure'];

    Try.prototype.isStatement = YES;

    Try.prototype.jumps = function(o) {
      var _ref2;
      return this.attempt.jumps(o) || ((_ref2 = this.recovery) != null ? _ref2.jumps(o) : void 0);
    };

    Try.prototype.makeReturn = function(res) {
      if (this.attempt) this.attempt = this.attempt.makeReturn(res);
      if (this.recovery) this.recovery = this.recovery.makeReturn(res);
      return this;
    };

    Try.prototype.compileNode = function(o) {
      var catchPart, ensurePart, errorPart, tryPart;
      o.indent += TAB;
      errorPart = this.error ? " (" + (this.error.compile(o)) + ") " : ' ';
      tryPart = this.attempt.compile(o, LEVEL_TOP);
      catchPart = this.recovery ? (!o.scope.check(this.error.value) ? o.scope.add(this.error.value, 'param') : void 0, " catch" + errorPart + "{\n" + (this.recovery.compile(o, LEVEL_TOP)) + "\n" + this.tab + "}") : !(this.ensure || this.recovery) ? ' catch (_error) {}' : void 0;
      ensurePart = this.ensure ? " finally {\n" + (this.ensure.compile(o, LEVEL_TOP)) + "\n" + this.tab + "}" : '';
      return "" + this.tab + "try {\n" + tryPart + "\n" + this.tab + "}" + (catchPart || '') + ensurePart;
    };

    return Try;

  })();

  exports.Throw = Throw = (function() {

    __extends(Throw, Base);

    function Throw(expression) {
      this.expression = expression;
    }

    Throw.prototype.children = ['expression'];

    Throw.prototype.isStatement = YES;

    Throw.prototype.jumps = NO;

    Throw.prototype.makeReturn = THIS;

    Throw.prototype.compileNode = function(o) {
      return this.tab + ("throw " + (this.expression.compile(o)) + ";");
    };

    return Throw;

  })();

  exports.Existence = Existence = (function() {

    __extends(Existence, Base);

    function Existence(expression) {
      this.expression = expression;
    }

    Existence.prototype.children = ['expression'];

    Existence.prototype.invert = NEGATE;

    Existence.prototype.compileNode = function(o) {
      var cmp, cnj, code, _ref2;
      this.expression.front = this.front;
      code = this.expression.compile(o, LEVEL_OP);
      if (IDENTIFIER.test(code) && !o.scope.check(code)) {
        _ref2 = this.negated ? ['===', '||'] : ['!==', '&&'], cmp = _ref2[0], cnj = _ref2[1];
        code = "typeof " + code + " " + cmp + " \"undefined\" " + cnj + " " + code + " " + cmp + " null";
      } else {
        code = "" + code + " " + (this.negated ? '==' : '!=') + " null";
      }
      if (o.level <= LEVEL_COND) {
        return code;
      } else {
        return "(" + code + ")";
      }
    };

    return Existence;

  })();

  exports.Parens = Parens = (function() {

    __extends(Parens, Base);

    function Parens(body) {
      this.body = body;
    }

    Parens.prototype.children = ['body'];

    Parens.prototype.unwrap = function() {
      return this.body;
    };

    Parens.prototype.isComplex = function() {
      return this.body.isComplex();
    };

    Parens.prototype.compileNode = function(o) {
      var bare, code, expr;
      expr = this.body.unwrap();
      if (expr instanceof Value && expr.isAtomic()) {
        expr.front = this.front;
        return expr.compile(o);
      }
      code = expr.compile(o, LEVEL_PAREN);
      bare = o.level < LEVEL_OP && (expr instanceof Op || expr instanceof Call || (expr instanceof For && expr.returns));
      if (bare) {
        return code;
      } else {
        return "(" + code + ")";
      }
    };

    return Parens;

  })();

  exports.For = For = (function() {

    __extends(For, While);

    function For(body, source) {
      var _ref2;
      this.source = source.source, this.guard = source.guard, this.step = source.step, this.name = source.name, this.index = source.index;
      this.body = Block.wrap([body]);
      this.own = !!source.own;
      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;
      this.pattern = this.name instanceof Value;
      if (this.range && this.index) {
        throw SyntaxError('indexes do not apply to range loops');
      }
      if (this.range && this.pattern) {
        throw SyntaxError('cannot pattern match over range loops');
      }
      this.returns = false;
    }

    For.prototype.children = ['body', 'source', 'guard', 'step'];

    For.prototype.compileNode = function(o) {
      var body, defPart, forPart, forVarPart, guardPart, idt1, index, ivar, lastJumps, lvar, name, namePart, ref, resultPart, returnResult, rvar, scope, source, stepPart, stepvar, svar, varPart, _ref2;
      body = Block.wrap([this.body]);
      lastJumps = (_ref2 = last(body.expressions)) != null ? _ref2.jumps() : void 0;
      if (lastJumps && lastJumps instanceof Return) this.returns = false;
      source = this.range ? this.source.base : this.source;
      scope = o.scope;
      name = this.name && this.name.compile(o, LEVEL_LIST);
      index = this.index && this.index.compile(o, LEVEL_LIST);
      if (name && !this.pattern) {
        scope.find(name, {
          immediate: true
        });
      }
      if (index) {
        scope.find(index, {
          immediate: true
        });
      }
      if (this.returns) rvar = scope.freeVariable('results');
      ivar = (this.range ? name : index) || scope.freeVariable('i');
      if (this.step && !this.range) stepvar = scope.freeVariable("step");
      if (this.pattern) name = ivar;
      varPart = '';
      guardPart = '';
      defPart = '';
      idt1 = this.tab + TAB;
      if (this.range) {
        forPart = source.compile(merge(o, {
          index: ivar,
          step: this.step
        }));
      } else {
        svar = this.source.compile(o, LEVEL_LIST);
        if ((name || this.own) && !IDENTIFIER.test(svar)) {
          defPart = "" + this.tab + (ref = scope.freeVariable('ref')) + " = " + svar + ";\n";
          svar = ref;
        }
        if (name && !this.pattern) {
          namePart = "" + name + " = " + svar + "[" + ivar + "]";
        }
        if (!this.object) {
          lvar = scope.freeVariable('len');
          forVarPart = ("" + ivar + " = 0, " + lvar + " = " + svar + ".length") + (this.step ? ", " + stepvar + " = " + (this.step.compile(o, LEVEL_OP)) : '');
          stepPart = this.step ? "" + ivar + " += " + stepvar : "" + ivar + "++";
          forPart = "" + forVarPart + "; " + ivar + " < " + lvar + "; " + stepPart;
        }
      }
      if (this.returns) {
        resultPart = "" + this.tab + rvar + " = [];\n";
        returnResult = "\n" + this.tab + "return " + rvar + ";";
        body.makeReturn(rvar);
      }
      if (this.guard) {
        if (body.expressions.length > 1) {
          body.expressions.unshift(new If((new Parens(this.guard)).invert(), new Literal("continue")));
        } else {
          if (this.guard) body = Block.wrap([new If(this.guard, body)]);
        }
      }
      if (this.pattern) {
        body.expressions.unshift(new Assign(this.name, new Literal("" + svar + "[" + ivar + "]")));
      }
      defPart += this.pluckDirectCall(o, body);
      if (namePart) varPart = "\n" + idt1 + namePart + ";";
      if (this.object) {
        forPart = "" + ivar + " in " + svar;
        if (this.own) {
          guardPart = "\n" + idt1 + "if (!" + (utility('hasProp')) + ".call(" + svar + ", " + ivar + ")) continue;";
        }
      }
      body = body.compile(merge(o, {
        indent: idt1
      }), LEVEL_TOP);
      if (body) body = '\n' + body + '\n';
      return "" + defPart + (resultPart || '') + this.tab + "for (" + forPart + ") {" + guardPart + varPart + body + this.tab + "}" + (returnResult || '');
    };

    For.prototype.pluckDirectCall = function(o, body) {
      var base, defs, expr, fn, idx, ref, val, _len, _ref2, _ref3, _ref4, _ref5, _ref6, _ref7;
      defs = '';
      _ref2 = body.expressions;
      for (idx = 0, _len = _ref2.length; idx < _len; idx++) {
        expr = _ref2[idx];
        expr = expr.unwrapAll();
        if (!(expr instanceof Call)) continue;
        val = expr.variable.unwrapAll();
        if (!((val instanceof Code) || (val instanceof Value && ((_ref3 = val.base) != null ? _ref3.unwrapAll() : void 0) instanceof Code && val.properties.length === 1 && ((_ref4 = (_ref5 = val.properties[0].name) != null ? _ref5.value : void 0) === 'call' || _ref4 === 'apply')))) {
          continue;
        }
        fn = ((_ref6 = val.base) != null ? _ref6.unwrapAll() : void 0) || val;
        ref = new Literal(o.scope.freeVariable('fn'));
        base = new Value(ref);
        if (val.base) _ref7 = [base, val], val.base = _ref7[0], base = _ref7[1];
        body.expressions[idx] = new Call(base, expr.args);
        defs += this.tab + new Assign(ref, fn).compile(o, LEVEL_TOP) + ';\n';
      }
      return defs;
    };

    return For;

  })();

  exports.Switch = Switch = (function() {

    __extends(Switch, Base);

    function Switch(subject, cases, otherwise) {
      this.subject = subject;
      this.cases = cases;
      this.otherwise = otherwise;
    }

    Switch.prototype.children = ['subject', 'cases', 'otherwise'];

    Switch.prototype.isStatement = YES;

    Switch.prototype.jumps = function(o) {
      var block, conds, _i, _len, _ref2, _ref3, _ref4;
      if (o == null) {
        o = {
          block: true
        };
      }
      _ref2 = this.cases;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        _ref3 = _ref2[_i], conds = _ref3[0], block = _ref3[1];
        if (block.jumps(o)) return block;
      }
      return (_ref4 = this.otherwise) != null ? _ref4.jumps(o) : void 0;
    };

    Switch.prototype.makeReturn = function(res) {
      var pair, _i, _len, _ref2, _ref3;
      _ref2 = this.cases;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        pair = _ref2[_i];
        pair[1].makeReturn(res);
      }
      if (res) {
        this.otherwise || (this.otherwise = new Block([new Literal('void 0')]));
      }
      if ((_ref3 = this.otherwise) != null) _ref3.makeReturn(res);
      return this;
    };

    Switch.prototype.compileNode = function(o) {
      var block, body, code, cond, conditions, expr, i, idt1, idt2, _i, _len, _len2, _ref2, _ref3, _ref4, _ref5;
      idt1 = o.indent + TAB;
      idt2 = o.indent = idt1 + TAB;
      code = this.tab + ("switch (" + (((_ref2 = this.subject) != null ? _ref2.compile(o, LEVEL_PAREN) : void 0) || false) + ") {\n");
      _ref3 = this.cases;
      for (i = 0, _len = _ref3.length; i < _len; i++) {
        _ref4 = _ref3[i], conditions = _ref4[0], block = _ref4[1];
        _ref5 = flatten([conditions]);
        for (_i = 0, _len2 = _ref5.length; _i < _len2; _i++) {
          cond = _ref5[_i];
          if (!this.subject) cond = cond.invert();
          code += idt1 + ("case " + (cond.compile(o, LEVEL_PAREN)) + ":\n");
        }
        if (body = block.compile(o, LEVEL_TOP)) code += body + '\n';
        if (i === this.cases.length - 1 && !this.otherwise) break;
        expr = this.lastNonComment(block.expressions);
        if (expr instanceof Return || (expr instanceof Literal && expr.jumps() && expr.value !== 'debugger')) {
          continue;
        }
        code += idt2 + 'break;\n';
      }
      if (this.otherwise && this.otherwise.expressions.length) {
        code += idt1 + ("default:\n" + (this.otherwise.compile(o, LEVEL_TOP)) + "\n");
      }
      return code + this.tab + '}';
    };

    return Switch;

  })();

  exports.If = If = (function() {

    __extends(If, Base);

    function If(condition, body, options) {
      this.body = body;
      if (options == null) options = {};
      this.condition = options.type === 'unless' ? condition.invert() : condition;
      this.elseBody = null;
      this.isChain = false;
      this.soak = options.soak;
    }

    If.prototype.children = ['condition', 'body', 'elseBody'];

    If.prototype.bodyNode = function() {
      var _ref2;
      return (_ref2 = this.body) != null ? _ref2.unwrap() : void 0;
    };

    If.prototype.elseBodyNode = function() {
      var _ref2;
      return (_ref2 = this.elseBody) != null ? _ref2.unwrap() : void 0;
    };

    If.prototype.addElse = function(elseBody) {
      if (this.isChain) {
        this.elseBodyNode().addElse(elseBody);
      } else {
        this.isChain = elseBody instanceof If;
        this.elseBody = this.ensureBlock(elseBody);
      }
      return this;
    };

    If.prototype.callContinuation = function() {
      var code;
      code = CALL_CONTINUATION();
      if (this.elseBody) {
        this.elseBody.push(code);
        this.isChain = false;
      } else {
        this.addElse(code);
      }
      return this.body.push(code);
    };

    If.prototype.isStatement = function(o) {
      var _ref2;
      return (o != null ? o.level : void 0) === LEVEL_TOP || this.bodyNode().isStatement(o) || ((_ref2 = this.elseBodyNode()) != null ? _ref2.isStatement(o) : void 0);
    };

    If.prototype.jumps = function(o) {
      var _ref2;
      return this.body.jumps(o) || ((_ref2 = this.elseBody) != null ? _ref2.jumps(o) : void 0);
    };

    If.prototype.compileNode = function(o) {
      if (this.isStatement(o || this.needsCpsRotation())) {
        return this.compileStatement(o);
      } else {
        return this.compileExpression(o);
      }
    };

    If.prototype.makeReturn = function(res) {
      if (res) {
        this.elseBody || (this.elseBody = new Block([new Literal('void 0')]));
      }
      this.body && (this.body = new Block([this.body.makeReturn(res)]));
      this.elseBody && (this.elseBody = new Block([this.elseBody.makeReturn(res)]));
      return this;
    };

    If.prototype.ensureBlock = function(node) {
      if (node instanceof Block) {
        return node;
      } else {
        return new Block([node]);
      }
    };

    If.prototype.compileStatement = function(o) {
      var body, bodyc, child, cond, exeq, ifPart, _ref2;
      child = del(o, 'chainChild');
      exeq = del(o, 'isExistentialEquals');
      if (exeq) {
        return new If(this.condition.invert(), this.elseBodyNode(), {
          type: 'if'
        }).compile(o);
      }
      cond = this.condition.compile(o, LEVEL_PAREN);
      o.indent += TAB;
      body = this.ensureBlock(this.body);
      bodyc = body.compile(o);
      if (1 === ((_ref2 = body.expressions) != null ? _ref2.length : void 0) && !this.elseBody && !child && bodyc && cond && -1 === (bodyc.indexOf('\n')) && 80 > cond.length + bodyc.length) {
        return "" + this.tab + "if (" + cond + ") " + (bodyc.replace(/^\s+/, ''));
      }
      if (bodyc) bodyc = "\n" + bodyc + "\n" + this.tab;
      ifPart = "if (" + cond + ") {" + bodyc + "}";
      if (!child) ifPart = this.tab + ifPart;
      if (!this.elseBody) return ifPart;
      return ifPart + ' else ' + (this.isChain ? (o.indent = this.tab, o.chainChild = true, this.elseBody.unwrap().compile(o, LEVEL_TOP)) : "{\n" + (this.elseBody.compile(o, LEVEL_TOP)) + "\n" + this.tab + "}");
    };

    If.prototype.compileExpression = function(o) {
      var alt, body, code, cond;
      cond = this.condition.compile(o, LEVEL_COND);
      body = this.bodyNode().compile(o, LEVEL_LIST);
      alt = this.elseBodyNode() ? this.elseBodyNode().compile(o, LEVEL_LIST) : 'void 0';
      code = "" + cond + " ? " + body + " : " + alt;
      if (o.level >= LEVEL_COND) {
        return "(" + code + ")";
      } else {
        return code;
      }
    };

    If.prototype.unfoldSoak = function() {
      return this.soak && this;
    };

    return If;

  })();

  Closure = {
    wrap: function(expressions, statement, noReturn) {
      var args, call, func, mentionsArgs, meth;
      if (expressions.jumps()) return expressions;
      func = new Code([], Block.wrap([expressions]));
      args = [];
      if ((mentionsArgs = expressions.contains(this.literalArgs)) || expressions.contains(this.literalThis)) {
        meth = new Literal(mentionsArgs ? 'apply' : 'call');
        args = [new Literal('this')];
        if (mentionsArgs) args.push(new Literal('arguments'));
        func = new Value(func, [new Access(meth)]);
      }
      func.noReturn = noReturn;
      call = new Call(func, args);
      if (statement) {
        return Block.wrap([call]);
      } else {
        return call;
      }
    },
    literalArgs: function(node) {
      return node instanceof Literal && node.value === 'arguments' && !node.asKey;
    },
    literalThis: function(node) {
      return (node instanceof Literal && node.value === 'this' && !node.asKey) || (node instanceof Code && node.bound);
    }
  };

  CpsCascade = {
    wrap: function(statement, rest) {
      var call, cont, func;
      func = new Code([new Param(new Literal(tame["const"].k))], Block.wrap([statement]));
      cont = new Code([], Block.wrap([rest]));
      call = new Call(func, [cont]);
      return new Block([call]);
    }
  };

  unfoldSoak = function(o, parent, name) {
    var ifn;
    if (!(ifn = parent[name].unfoldSoak(o))) return;
    parent[name] = ifn.body;
    ifn.body = new Value(parent);
    return ifn;
  };

  UTILITIES = {
    "extends": function() {
      return "function(child, parent) { for (var key in parent) { if (" + (utility('hasProp')) + ".call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor; child.__super__ = parent.prototype; return child; }";
    },
    bind: function() {
      return 'function(fn, me){ return function(){ return fn.apply(me, arguments); }; }';
    },
    indexOf: function() {
      return "Array.prototype.indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (" + (utility('hasProp')) + ".call(this, i) && this[i] === item) return i; } return -1; }";
    },
    hasProp: function() {
      return 'Object.prototype.hasOwnProperty';
    },
    slice: function() {
      return 'Array.prototype.slice';
    }
  };

  LEVEL_TOP = 1;

  LEVEL_PAREN = 2;

  LEVEL_LIST = 3;

  LEVEL_COND = 4;

  LEVEL_OP = 5;

  LEVEL_ACCESS = 6;

  TAB = '  ';

  IDENTIFIER_STR = "[$A-Za-z_\\x7f-\\uffff][$\\w\\x7f-\\uffff]*";

  IDENTIFIER = RegExp("^" + IDENTIFIER_STR + "$");

  SIMPLENUM = /^[+-]?\d+$/;

  METHOD_DEF = RegExp("^(?:(" + IDENTIFIER_STR + ")\\.prototype(?:\\.(" + IDENTIFIER_STR + ")|\\[(\"(?:[^\\\\\"\\r\\n]|\\\\.)*\"|'(?:[^\\\\'\\r\\n]|\\\\.)*')\\]|\\[(0x[\\da-fA-F]+|\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\]))|(" + IDENTIFIER_STR + ")$");

  IS_STRING = /^['"]/;

  utility = function(name) {
    var ref;
    ref = "__" + name;
    Scope.root.assign(ref, UTILITIES[name]());
    return ref;
  };

  multident = function(code, tab) {
    code = code.replace(/\n/g, '$&' + tab);
    return code.replace(/\s+$/, '');
  };

}).call(this);