jashkenas--coffeescript/lib/coffeescript/scope.js

// Generated by CoffeeScript 2.0.0-beta1
(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 = class Scope {
    constructor(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;
    }

    add(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, type}) - 1;
      }
    }

    namedMethod() {
      var ref;
      if (((ref = this.method) != null ? ref.name : void 0) || !this.parent) {
        return this.method;
      }
      return this.parent.namedMethod();
    }

    find(name, type = 'var') {
      if (this.check(name)) {
        return true;
      }
      this.add(name, type);
      return false;
    }

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

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

    temporary(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 || ''}`;
      }
    }

    type(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;
    }

    freeVariable(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;
    }

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

    hasDeclarations() {
      return !!this.declaredVariables().length;
    }

    declaredVariables() {
      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();
    }

    assignedVariables() {
      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;
    }

  };

}).call(this);