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

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

export function moduleRef(moduleUrl): string {

return `#MODULE[${moduleUrl}]`;

}

/**

* Represents generated source code with module references. Internal to the Angular compiler.

*/

export class SourceModule {

static getSourceWithoutImports(sourceWithModuleRefs: string): string {

return StringWrapper.replaceAllMapped(sourceWithModuleRefs, MODULE_REGEXP, (match) => '');

}

constructor(public moduleUrl: string, public sourceWithModuleRefs: string) {}

getSourceWithImports(): SourceWithImports {

var moduleAliases = {};

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

var newSource =

StringWrapper.replaceAllMapped(this.sourceWithModuleRefs, MODULE_REGEXP, (match) => {

var moduleUrl = match[1];

var alias = moduleAliases[moduleUrl];

if (isBlank(alias)) {

if (moduleUrl == this.moduleUrl) {

alias = '';

} else {

alias = `import${imports.length}`;

imports.push([moduleUrl, alias]);

}

moduleAliases[moduleUrl] = alias;

}

return alias.length > 0 ? `${alias}.` : '';

});

return new SourceWithImports(newSource, imports);

}

}

export class SourceExpression {

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

}

export class SourceExpressions {

constructor(public declarations: string[], public expressions: string[]) {}

}

/**

* Represents generated source code with imports. Internal to the Angular compiler.

*/

export class SourceWithImports {

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

}