coffeescript/lib/coffee-script/scope.js

// Generated by CoffeeScript 2.0.0-alpha
(function() {
  var Scope,
    indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };

  exports.Scope = Scope = (function() {
    function Scope(parent, expressions, method, referencedVars) {
      var ref, ref1;
      this.parent = parent;
      this.expressions = expressions;
      this.method = method;
      this.referencedVars = referencedVars;
      this.variables = [
        {
          name: 'arguments',
          type: 'arguments'
        }
      ];
      this.positions = {};
      if (!this.parent) {
        this.utilities = {};
      }
      this.root = (ref = (ref1 = this.parent) != null ? ref1.root : void 0) != null ? ref : 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.namedMethod = function() {
      var ref;
      if (((ref = this.method) != null ? ref.name : void 0) || !this.parent) {
        return this.method;
      }
      return this.parent.namedMethod();
    };

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

    Scope.prototype.temporary = function(name, index, single = false) {
      var diff, endCode, letter, newCode, num, startCode;
      if (single) {
        startCode = name.charCodeAt(0);
        endCode = 'z'.charCodeAt(0);
        diff = endCode - startCode;
        newCode = startCode + index % (diff + 1);
        letter = String.fromCharCode(newCode);
        num = Math.floor(index / (diff + 1));
        return "" + letter + (num || '');
      } else {
        return "" + name + (index || '');
      }
    };

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

    Scope.prototype.freeVariable = function(name, options = {}) {
      var index, ref, temp;
      index = 0;
      while (true) {
        temp = this.temporary(name, index, options.single);
        if (!(this.check(temp) || indexOf.call(this.root.referencedVars, temp) >= 0)) {
          break;
        }
        index++;
      }
      if ((ref = options.reserve) != null ? ref : true) {
        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 v;
      return ((function() {
        var i, len, ref, results;
        ref = this.variables;
        results = [];
        for (i = 0, len = ref.length; i < len; i++) {
          v = ref[i];
          if (v.type === 'var') {
            results.push(v.name);
          }
        }
        return results;
      }).call(this)).sort();
    };

    Scope.prototype.assignedVariables = function() {
      var i, len, ref, results, v;
      ref = this.variables;
      results = [];
      for (i = 0, len = ref.length; i < len; i++) {
        v = ref[i];
        if (v.type.assigned) {
          results.push(v.name + " = " + v.type.value);
        }
      }
      return results;
    };

    return Scope;

  })();

}).call(this);