axe-core/build/tasks/langs.js

Accessibility engine for automated Web UI testing

/*eslint-env node */
'use strict';
var http = require('http');
var Promise = require('promise');
module.exports = function (grunt) {
	function getLine(data, start) {
		var len = data.length;
		var index = start;
		while(index < len) {
			if (data.charAt(index) === '\n') {
				break;
			}
			index += 1;
		}
		var retVal = data.substring(start, index+1);
		return retVal;
	}
	function getEntry(data, start) {
		var entry = [];
		var line;
		var len = data.length;
		var index = start;
		while(index < len) {
			line = getLine(data, index);
			if (line.indexOf('%') === 0) {
				index += line.length;
				// end of entry
				break;
			}
			index += line.length;
			line = line.substring(0, line.length - 1);
			entry.push(line);
		}
		entry.used = index - start;
		return entry;
	}
	function generateOutput(langs, checkPath) {
		var path = checkPath + '.js';
		var template = [
			'/* global axe */\n',
			'/*eslint quotes: 0*/\n',
			'var langs = ' + JSON.stringify(langs, null, '\t') + ';\n\n',
			'/**\n',
			' * Returns array of valid language codes\n',
			' * @method validLangs\n',
			' * @memberof axe.commons.utils\n',
			' * @instance\n',
			' * @return {Array<Sting>} Valid language codes\n',
			' */\n',
			'axe.utils.validLangs = function () {\n',
			'\t\'use strict\';\n',
			'\treturn langs;\n',
			'};\n'
		].join('');
		grunt.file.write(path, template);
	}
	grunt.registerMultiTask('langs',
		'Task for generating commons language codes from IANA registry',
		function () {
			var done = this.async();
			var ianaLangsURL = 'http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry';
			if (!this.data.check) {
				done(false);
				return;
			}
			var check = this.data.check;
			var langs = [];
			new Promise(function (resolve, reject) {
				var data = '';
				http.get(ianaLangsURL, function(res) {
					res.on('data', function(chunk) {
						data += chunk;
					}).on('end', function () {
						resolve(data);
					});
				}).on('error', function(e) {
					grunt.log.error('Got error: ' + e.message);
					reject(false);
				});
			}).then(function (data) {
				var entry = getEntry(data, 0);
				var pos = entry.used;
				while(true) {
					entry = getEntry(data, pos);
					pos += entry.used;
					if (!entry.used) {
						break;
					}
					if (entry[0] !== 'Type: language') {
						continue;
					}
					var lang = entry[1].replace('Subtag: ', '').trim();
					langs.push(lang);
				}
				generateOutput(langs, check);
			}).then(function () {
				done();
			}).catch(function (result) {
				done(result);
			});
		}
	);
};