/*
 * Copyright (c) 2011 Jeremy Ashkenas
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

define(function(require, exports, module) {
// Generated by CoffeeScript 1.2.1-pre

  var Scope, extend, last, _ref;

  _ref = require('./helpers'), extend = _ref.extend, last = _ref.last;

  exports.Scope = Scope = (function() {

    Scope.name = 'Scope';

    Scope.root = null;

    function Scope(parent, expressions, method) {
      this.parent = parent;
      this.expressions = expressions;
      this.method = method;
      this.variables = [
        {
          name: 'arguments',
          type: 'arguments'
        }
      ];
      this.positions = {};
      if (!this.parent) Scope.root = this;
    }

    Scope.prototype.add = function(name, type, immediate) {
      if (this.shared && !immediate) return this.parent.add(name, type, immediate);
      if (Object.prototype.hasOwnProperty.call(this.positions, name)) {
        return this.variables[this.positions[name]].type = type;
      } else {
        return this.positions[name] = this.variables.push({
          name: name,
          type: type
        }) - 1;
      }
    };

    Scope.prototype.find = function(name, options) {
      if (this.check(name, options)) return true;
      this.add(name, 'var');
      return false;
    };

    Scope.prototype.parameter = function(name) {
      if (this.shared && this.parent.check(name, true)) return;
      return this.add(name, 'param');
    };

    Scope.prototype.check = function(name, immediate) {
      var found, _ref1;
      found = !!this.type(name);
      if (found || immediate) return found;
      return !!((_ref1 = this.parent) != null ? _ref1.check(name) : void 0);
    };

    Scope.prototype.temporary = function(name, index) {
      if (name.length > 1) {
        return '_' + name + (index > 1 ? index - 1 : '');
      } else {
        return '_' + (index + parseInt(name, 36)).toString(36).replace(/\d/g, 'a');
      }
    };

    Scope.prototype.type = function(name) {
      var v, _i, _len, _ref1;
      _ref1 = this.variables;
      for (_i = 0, _len = _ref1.length; _i < _len; _i++) {
        v = _ref1[_i];
        if (v.name === name) return v.type;
      }
      return null;
    };

    Scope.prototype.freeVariable = function(name, reserve) {
      var index, temp;
      if (reserve == null) reserve = true;
      index = 0;
      while (this.check((temp = this.temporary(name, index)))) {
        index++;
      }
      if (reserve) this.add(temp, 'var', true);
      return temp;
    };

    Scope.prototype.assign = function(name, value) {
      this.add(name, {
        value: value,
        assigned: true
      }, true);
      return this.hasAssignments = true;
    };

    Scope.prototype.hasDeclarations = function() {
      return !!this.declaredVariables().length;
    };

    Scope.prototype.declaredVariables = function() {
      var realVars, tempVars, v, _i, _len, _ref1;
      realVars = [];
      tempVars = [];
      _ref1 = this.variables;
      for (_i = 0, _len = _ref1.length; _i < _len; _i++) {
        v = _ref1[_i];
        if (v.type === 'var') {
          (v.name.charAt(0) === '_' ? tempVars : realVars).push(v.name);
        }
      }
      return realVars.sort().concat(tempVars.sort());
    };

    Scope.prototype.assignedVariables = function() {
      var v, _i, _len, _ref1, _results;
      _ref1 = this.variables;
      _results = [];
      for (_i = 0, _len = _ref1.length; _i < _len; _i++) {
        v = _ref1[_i];
        if (v.type.assigned) _results.push("" + v.name + " = " + v.type.value);
      }
      return _results;
    };

    return Scope;

  })();


});