(function() {
  var Scope, extend, last, _ref;

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

  exports.Scope = Scope = (function() {

    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) {
      var pos;
      if (this.shared && !immediate) return this.parent.add(name, type, immediate);
      if (typeof (pos = this.positions[name]) === 'number') {
        return this.variables[pos].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, _ref2;
      found = !!this.type(name);
      if (found || immediate) return found;
      return !!((_ref2 = this.parent) != null ? _ref2.check(name) : void 0);
    };

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

    Scope.prototype.type = function(name) {
      var v, _i, _len, _ref2;
      _ref2 = this.variables;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        v = _ref2[_i];
        if (v.name === name) return v.type;
      }
      return null;
    };

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

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

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

    Scope.prototype.declaredVariables = function() {
      var realVars, tempVars, v, _i, _len, _ref2;
      realVars = [];
      tempVars = [];
      _ref2 = this.variables;
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        v = _ref2[_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, _ref2, _results;
      _ref2 = this.variables;
      _results = [];
      for (_i = 0, _len = _ref2.length; _i < _len; _i++) {
        v = _ref2[_i];
        if (v.type.assigned) _results.push("" + v.name + " = " + v.type.value);
      }
      return _results;
    };

    return Scope;

  })();

}).call(this);
