angular__angular/modules/angular2/src/compiler/source_module.ts

import {StringWrapper, isBlank} from 'angular2/src/core/facade/lang';

var MODULE_REGEXP = /#MODULE\[([^\]]*)\]/g;

export function moduleRef(moduleId): string {
  return `#MODULE[${moduleId}]`;
}

export class SourceModule {
  constructor(public moduleId: string, public source: string) {}

  getSourceWithImports(): SourceWithImports {
    var moduleAliases = {};
    var imports: string[][] = [];
    var newSource = StringWrapper.replaceAllMapped(this.source, MODULE_REGEXP, (match) => {
      var moduleId = match[1];
      var alias = moduleAliases[moduleId];
      if (isBlank(alias)) {
        if (moduleId == this.moduleId) {
          alias = '';
        } else {
          alias = `import${imports.length}`;
          imports.push([moduleId, alias]);
        }
        moduleAliases[moduleId] = alias;
      }
      return alias.length > 0 ? `${alias}.` : '';
    });
    return new SourceWithImports(newSource, imports);
  }
}

export class SourceExpression {
  constructor(public declarations: string[], public expression: string) {}
}

export class SourceWithImports {
  constructor(public source: string, public imports: string[][]) {}
}