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 sourceWithModuleRefs: string) {}

getSourceWithImports(): SourceWithImports {

var moduleAliases = {};

var imports: string[][] = [];

var newSource =

StringWrapper.replaceAllMapped(this.sourceWithModuleRefs, 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[][]) {}

}