traceur/src/codegeneration/module/ExportListBuilder.js

ES6 to ES5 compiler

// Copyright 2012 Traceur Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import {ExportVisitor} from './ExportVisitor.js';
import {ValidationVisitor} from './ValidationVisitor.js';

// TODO(arv): Validate that there are no free variables
// TODO(arv): Validate that the exported reference exists

/**
 * Builds up all module symbols and validates them.
 * @param {Array.<ModuleSymbole>} deps
 * @param {Loader} loader
 * @param {ErrorReporter} reporter
 * @return {void}
 */
export function buildExportList(deps, loader, reporter) {

  function doVisit(ctor) {
    for (let i = 0; i < deps.length; i++) {
      let visitor = new ctor(reporter, loader, deps[i]);
      visitor.visitAny(deps[i].tree);
    }
  }

  function reverseVisit(ctor) {
    for (let i = deps.length - 1; i >= 0; i--) {
      let visitor = new ctor(reporter, loader, deps[i]);
      visitor.visitAny(deps[i].tree);
    }
  }

  // Export star needs to be done in dependency order.
  reverseVisit(ExportVisitor);
  doVisit(ValidationVisitor);
}