import { EOL } from "os";

import * as constants from "./constants";

export class XmlValidator implements IXmlValidator {

constructor(private $fs: IFileSystem,

private $logger: ILogger) { }

public validateXmlFiles(sourceFiles: string[]): boolean {

let xmlHasErrors = false;

sourceFiles

.filter(file => _.endsWith(file, constants.XML_FILE_EXTENSION))

.forEach(file => {

const errorOutput = this.getXmlFileErrors(file);

const hasErrors = !!errorOutput;

xmlHasErrors = xmlHasErrors || hasErrors;

if (hasErrors) {

this.$logger.info(`${file} has syntax errors.`.red.bold);

this.$logger.info(errorOutput.yellow);

}

});

return !xmlHasErrors;

}

public getXmlFileErrors(sourceFile: string): string {

let errorOutput = "";

const fileContents = this.$fs.readText(sourceFile);

const domErrorHandler = (level: any, msg: string) => {

errorOutput += level + EOL + msg + EOL;

};

this.getDomParser(domErrorHandler).parseFromString(fileContents, "text/xml");

return errorOutput || null;

}

private getDomParser(errorHandler: (level: any, msg: string) => void): any {

const DomParser = require("xmldom").DOMParser;

const parser = new DomParser({

locator: {},

errorHandler: errorHandler

});

return parser;

}

}

$injector.register("xmlValidator", XmlValidator);