Plato - lang/compiler/codegen/scope.js

(function(sc) {
  "use strict";

require("../compiler");

function Scope() {
    this.stack = [];
    this.tempVarId = 0;
    this.begin();
  }

Scope.prototype.add = function(type, name, scope) {
    delegate[type](scope || this.peek(), name);
    return this;
  };

Scope.prototype.begin = function() {
    this.stack.unshift({
      vars: {},
      args: {},
      stmt: { head: [], vars: [], tail: [] }
    });
    return this;
  };

Scope.prototype.end = function() {
    this.stack.shift();
    return this;
  };

Scope.prototype.toVariableStatement = function() {
    var stmt = this.peek().stmt;
    return [ stmt.head, stmt.vars, stmt.tail ];
  };

Scope.prototype.peek = function() {
    return this.stack[0];
  };

Scope.prototype.find = function(name) {
    return this.stack.some(function(scope) {
      return scope.vars[name] || scope.args[name];
    });
  };

sc.lang.compiler.Scope = Scope;
})(sc);

lang/compiler/codegen/scope.js

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