872 lines
23 KiB
JavaScript
872 lines
23 KiB
JavaScript
/*! Dust - Asynchronous Templating - v2.4.2
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* http://linkedin.github.io/dustjs/
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* Copyright (c) 2014 Aleksander Williams; Released under the MIT License */
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(function(root) {
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var dust = {},
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NONE = 'NONE',
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ERROR = 'ERROR',
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WARN = 'WARN',
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INFO = 'INFO',
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DEBUG = 'DEBUG',
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loggingLevels = [DEBUG, INFO, WARN, ERROR, NONE],
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EMPTY_FUNC = function() {},
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logger = {},
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originalLog,
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loggerContext;
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dust.debugLevel = NONE;
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// Try to find the console in global scope
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if (root && root.console && root.console.log) {
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loggerContext = root.console;
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originalLog = root.console.log;
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}
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// robust logger for node.js, modern browsers, and IE <= 9.
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logger.log = loggerContext ? function() {
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// Do this for normal browsers
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if (typeof originalLog === 'function') {
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logger.log = function() {
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originalLog.apply(loggerContext, arguments);
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};
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} else {
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// Do this for IE <= 9
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logger.log = function() {
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var message = Array.prototype.slice.apply(arguments).join(' ');
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originalLog(message);
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};
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}
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logger.log.apply(this, arguments);
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} : function() { /* no op */ };
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/**
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* Log dust debug statements, info statements, warning statements, and errors.
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* Filters out the messages based on the dust.debuglevel.
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* This default implementation will print to the console if it exists.
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* @param {String|Error} message the message to print/throw
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* @param {String} type the severity of the message(ERROR, WARN, INFO, or DEBUG)
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* @public
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*/
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dust.log = function(message, type) {
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type = type || INFO;
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if (dust.debugLevel !== NONE && dust.indexInArray(loggingLevels, type) >= dust.indexInArray(loggingLevels, dust.debugLevel)) {
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if(!dust.logQueue) {
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dust.logQueue = [];
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}
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dust.logQueue.push({message: message, type: type});
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logger.log('[DUST ' + type + ']: ' + message);
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}
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};
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dust.helpers = {};
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dust.cache = {};
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dust.register = function(name, tmpl) {
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if (!name) {
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return;
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}
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dust.cache[name] = tmpl;
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};
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dust.render = function(name, context, callback) {
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var chunk = new Stub(callback).head;
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try {
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dust.load(name, chunk, Context.wrap(context, name)).end();
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} catch (err) {
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chunk.setError(err);
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}
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};
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dust.stream = function(name, context) {
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var stream = new Stream(),
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chunk = stream.head;
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dust.nextTick(function() {
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try {
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dust.load(name, stream.head, Context.wrap(context, name)).end();
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} catch (err) {
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chunk.setError(err);
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}
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});
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return stream;
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};
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dust.renderSource = function(source, context, callback) {
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return dust.compileFn(source)(context, callback);
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};
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dust.compileFn = function(source, name) {
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// name is optional. When name is not provided the template can only be rendered using the callable returned by this function.
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// If a name is provided the compiled template can also be rendered by name.
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name = name || null;
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var tmpl = dust.loadSource(dust.compile(source, name));
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return function(context, callback) {
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var master = callback ? new Stub(callback) : new Stream();
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dust.nextTick(function() {
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if(typeof tmpl === 'function') {
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tmpl(master.head, Context.wrap(context, name)).end();
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}
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else {
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dust.log(new Error('Template [' + name + '] cannot be resolved to a Dust function'), ERROR);
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}
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});
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return master;
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};
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};
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dust.load = function(name, chunk, context) {
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var tmpl = dust.cache[name];
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if (tmpl) {
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return tmpl(chunk, context);
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} else {
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if (dust.onLoad) {
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return chunk.map(function(chunk) {
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dust.onLoad(name, function(err, src) {
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if (err) {
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return chunk.setError(err);
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}
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if (!dust.cache[name]) {
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dust.loadSource(dust.compile(src, name));
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}
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dust.cache[name](chunk, context).end();
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});
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});
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}
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return chunk.setError(new Error('Template Not Found: ' + name));
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}
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};
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dust.loadSource = function(source, path) {
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return eval(source);
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};
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if (Array.isArray) {
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dust.isArray = Array.isArray;
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} else {
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dust.isArray = function(arr) {
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return Object.prototype.toString.call(arr) === '[object Array]';
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};
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}
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// indexOf shim for arrays for IE <= 8
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// source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
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dust.indexInArray = function(arr, item, fromIndex) {
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fromIndex = +fromIndex || 0;
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if (Array.prototype.indexOf) {
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return arr.indexOf(item, fromIndex);
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} else {
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if ( arr === undefined || arr === null ) {
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throw new TypeError( 'cannot call method "indexOf" of null' );
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}
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var length = arr.length; // Hack to convert object.length to a UInt32
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if (Math.abs(fromIndex) === Infinity) {
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fromIndex = 0;
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}
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if (fromIndex < 0) {
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fromIndex += length;
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if (fromIndex < 0) {
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fromIndex = 0;
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}
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}
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for (;fromIndex < length; fromIndex++) {
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if (arr[fromIndex] === item) {
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return fromIndex;
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}
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}
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return -1;
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}
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};
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dust.nextTick = (function() {
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return function(callback) {
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setTimeout(callback,0);
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};
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} )();
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dust.isEmpty = function(value) {
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if (dust.isArray(value) && !value.length) {
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return true;
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}
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if (value === 0) {
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return false;
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}
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return (!value);
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};
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// apply the filter chain and return the output string
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dust.filter = function(string, auto, filters) {
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if (filters) {
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for (var i=0, len=filters.length; i<len; i++) {
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var name = filters[i];
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if (name === 's') {
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auto = null;
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}
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else if (typeof dust.filters[name] === 'function') {
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string = dust.filters[name](string);
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}
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else {
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dust.log('Invalid filter [' + name + ']', WARN);
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}
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}
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}
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// by default always apply the h filter, unless asked to unescape with |s
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if (auto) {
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string = dust.filters[auto](string);
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}
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return string;
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};
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dust.filters = {
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h: function(value) { return dust.escapeHtml(value); },
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j: function(value) { return dust.escapeJs(value); },
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u: encodeURI,
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uc: encodeURIComponent,
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js: function(value) {
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if (!JSON) {
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dust.log('JSON is undefined. JSON stringify has not been used on [' + value + ']', WARN);
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return value;
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} else {
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return JSON.stringify(value);
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}
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},
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jp: function(value) {
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if (!JSON) {dust.log('JSON is undefined. JSON parse has not been used on [' + value + ']', WARN);
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return value;
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} else {
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return JSON.parse(value);
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}
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}
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};
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function Context(stack, global, blocks, templateName) {
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this.stack = stack;
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this.global = global;
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this.blocks = blocks;
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this.templateName = templateName;
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}
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dust.makeBase = function(global) {
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return new Context(new Stack(), global);
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};
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Context.wrap = function(context, name) {
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if (context instanceof Context) {
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return context;
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}
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return new Context(new Stack(context), {}, null, name);
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};
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/**
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* Public API for getting a value from the context.
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* @method get
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* @param {string|array} path The path to the value. Supported formats are:
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* 'key'
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* 'path.to.key'
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* '.path.to.key'
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* ['path', 'to', 'key']
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* ['key']
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* @param {boolean} [cur=false] Boolean which determines if the search should be limited to the
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* current context (true), or if get should search in parent contexts as well (false).
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* @public
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* @returns {string|object}
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*/
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Context.prototype.get = function(path, cur) {
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if (typeof path === 'string') {
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if (path[0] === '.') {
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cur = true;
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path = path.substr(1);
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}
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path = path.split('.');
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}
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return this._get(cur, path);
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};
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/**
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* Get a value from the context
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* @method _get
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* @param {boolean} cur Get only from the current context
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* @param {array} down An array of each step in the path
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* @private
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* @return {string | object}
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*/
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Context.prototype._get = function(cur, down) {
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var ctx = this.stack,
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i = 1,
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value, first, len, ctxThis;
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first = down[0];
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len = down.length;
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if (cur && len === 0) {
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ctxThis = ctx;
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ctx = ctx.head;
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} else {
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if (!cur) {
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// Search up the stack for the first value
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while (ctx) {
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if (ctx.isObject) {
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ctxThis = ctx.head;
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value = ctx.head[first];
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if (value !== undefined) {
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break;
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}
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}
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ctx = ctx.tail;
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}
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if (value !== undefined) {
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ctx = value;
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} else {
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ctx = this.global ? this.global[first] : undefined;
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}
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} else if (ctx) {
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// if scope is limited by a leading dot, don't search up the tree
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if(ctx.head) {
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ctx = ctx.head[first];
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} else {
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//context's head is empty, value we are searching for is not defined
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ctx = undefined;
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}
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}
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while (ctx && i < len) {
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ctxThis = ctx;
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ctx = ctx[down[i]];
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i++;
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}
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}
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// Return the ctx or a function wrapping the application of the context.
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if (typeof ctx === 'function') {
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return function() {
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try {
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return ctx.apply(ctxThis, arguments);
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} catch (err) {
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dust.log(err, ERROR);
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throw err;
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}
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};
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} else {
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if (ctx === undefined) {
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dust.log('Cannot find the value for reference [{' + down.join('.') + '}] in template [' + this.getTemplateName() + ']');
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}
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return ctx;
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}
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};
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Context.prototype.getPath = function(cur, down) {
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return this._get(cur, down);
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};
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Context.prototype.push = function(head, idx, len) {
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return new Context(new Stack(head, this.stack, idx, len), this.global, this.blocks, this.getTemplateName());
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};
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Context.prototype.rebase = function(head) {
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return new Context(new Stack(head), this.global, this.blocks, this.getTemplateName());
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};
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Context.prototype.current = function() {
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return this.stack.head;
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};
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Context.prototype.getBlock = function(key, chk, ctx) {
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if (typeof key === 'function') {
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var tempChk = new Chunk();
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key = key(tempChk, this).data.join('');
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}
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var blocks = this.blocks;
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if (!blocks) {
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dust.log('No blocks for context[{' + key + '}] in template [' + this.getTemplateName() + ']', DEBUG);
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return;
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}
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var len = blocks.length, fn;
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while (len--) {
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fn = blocks[len][key];
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if (fn) {
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return fn;
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}
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}
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};
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Context.prototype.shiftBlocks = function(locals) {
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var blocks = this.blocks,
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newBlocks;
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if (locals) {
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if (!blocks) {
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newBlocks = [locals];
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} else {
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newBlocks = blocks.concat([locals]);
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}
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return new Context(this.stack, this.global, newBlocks, this.getTemplateName());
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}
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return this;
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};
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Context.prototype.getTemplateName = function() {
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return this.templateName;
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};
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function Stack(head, tail, idx, len) {
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this.tail = tail;
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this.isObject = head && typeof head === 'object';
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this.head = head;
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this.index = idx;
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this.of = len;
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}
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function Stub(callback) {
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this.head = new Chunk(this);
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this.callback = callback;
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this.out = '';
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}
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Stub.prototype.flush = function() {
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var chunk = this.head;
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while (chunk) {
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if (chunk.flushable) {
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this.out += chunk.data.join(''); //ie7 perf
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} else if (chunk.error) {
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this.callback(chunk.error);
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dust.log('Chunk error [' + chunk.error + '] thrown. Ceasing to render this template.', WARN);
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this.flush = EMPTY_FUNC;
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return;
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} else {
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return;
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}
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chunk = chunk.next;
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this.head = chunk;
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}
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this.callback(null, this.out);
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};
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function Stream() {
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this.head = new Chunk(this);
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}
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Stream.prototype.flush = function() {
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var chunk = this.head;
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while(chunk) {
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if (chunk.flushable) {
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this.emit('data', chunk.data.join('')); //ie7 perf
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} else if (chunk.error) {
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this.emit('error', chunk.error);
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dust.log('Chunk error [' + chunk.error + '] thrown. Ceasing to render this template.', WARN);
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this.flush = EMPTY_FUNC;
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return;
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} else {
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return;
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}
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chunk = chunk.next;
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this.head = chunk;
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}
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this.emit('end');
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};
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Stream.prototype.emit = function(type, data) {
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if (!this.events) {
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dust.log('No events to emit', INFO);
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return false;
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}
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var handler = this.events[type];
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if (!handler) {
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dust.log('Event type [' + type + '] does not exist', WARN);
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return false;
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}
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if (typeof handler === 'function') {
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handler(data);
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} else if (dust.isArray(handler)) {
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var listeners = handler.slice(0);
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for (var i = 0, l = listeners.length; i < l; i++) {
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listeners[i](data);
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}
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} else {
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dust.log('Event Handler [' + handler + '] is not of a type that is handled by emit', WARN);
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}
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};
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Stream.prototype.on = function(type, callback) {
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if (!this.events) {
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this.events = {};
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}
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if (!this.events[type]) {
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dust.log('Event type [' + type + '] does not exist. Using just the specified callback.', WARN);
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if(callback) {
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this.events[type] = callback;
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} else {
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dust.log('Callback for type [' + type + '] does not exist. Listener not registered.', WARN);
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}
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} else if(typeof this.events[type] === 'function') {
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this.events[type] = [this.events[type], callback];
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} else {
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this.events[type].push(callback);
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}
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return this;
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};
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Stream.prototype.pipe = function(stream) {
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this.on('data', function(data) {
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try {
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stream.write(data, 'utf8');
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} catch (err) {
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dust.log(err, ERROR);
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}
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}).on('end', function() {
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try {
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return stream.end();
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} catch (err) {
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dust.log(err, ERROR);
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}
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}).on('error', function(err) {
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stream.error(err);
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});
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return this;
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};
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function Chunk(root, next, taps) {
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this.root = root;
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this.next = next;
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this.data = []; //ie7 perf
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this.flushable = false;
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this.taps = taps;
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}
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Chunk.prototype.write = function(data) {
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var taps = this.taps;
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if (taps) {
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data = taps.go(data);
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}
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this.data.push(data);
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return this;
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};
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Chunk.prototype.end = function(data) {
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if (data) {
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this.write(data);
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}
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this.flushable = true;
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this.root.flush();
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return this;
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};
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Chunk.prototype.map = function(callback) {
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var cursor = new Chunk(this.root, this.next, this.taps),
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branch = new Chunk(this.root, cursor, this.taps);
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this.next = branch;
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this.flushable = true;
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try {
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callback(branch);
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} catch(e) {
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dust.log(e, ERROR);
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branch.setError(e);
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}
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return cursor;
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};
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|
|
|
Chunk.prototype.tap = function(tap) {
|
|
var taps = this.taps;
|
|
|
|
if (taps) {
|
|
this.taps = taps.push(tap);
|
|
} else {
|
|
this.taps = new Tap(tap);
|
|
}
|
|
return this;
|
|
};
|
|
|
|
Chunk.prototype.untap = function() {
|
|
this.taps = this.taps.tail;
|
|
return this;
|
|
};
|
|
|
|
Chunk.prototype.render = function(body, context) {
|
|
return body(this, context);
|
|
};
|
|
|
|
Chunk.prototype.reference = function(elem, context, auto, filters) {
|
|
if (typeof elem === 'function') {
|
|
// Changed the function calling to use apply with the current context to make sure
|
|
// that "this" is wat we expect it to be inside the function
|
|
elem = elem.apply(context.current(), [this, context, null, {auto: auto, filters: filters}]);
|
|
if (elem instanceof Chunk) {
|
|
return elem;
|
|
}
|
|
}
|
|
if (!dust.isEmpty(elem)) {
|
|
return this.write(dust.filter(elem, auto, filters));
|
|
} else {
|
|
return this;
|
|
}
|
|
};
|
|
|
|
Chunk.prototype.section = function(elem, context, bodies, params) {
|
|
// anonymous functions
|
|
if (typeof elem === 'function') {
|
|
try {
|
|
elem = elem.apply(context.current(), [this, context, bodies, params]);
|
|
} catch(e) {
|
|
dust.log(e, ERROR);
|
|
return this.setError(e);
|
|
}
|
|
// functions that return chunks are assumed to have handled the body and/or have modified the chunk
|
|
// use that return value as the current chunk and go to the next method in the chain
|
|
if (elem instanceof Chunk) {
|
|
return elem;
|
|
}
|
|
}
|
|
var body = bodies.block,
|
|
skip = bodies['else'];
|
|
|
|
// a.k.a Inline parameters in the Dust documentations
|
|
if (params) {
|
|
context = context.push(params);
|
|
}
|
|
|
|
/*
|
|
Dust's default behavior is to enumerate over the array elem, passing each object in the array to the block.
|
|
When elem resolves to a value or object instead of an array, Dust sets the current context to the value
|
|
and renders the block one time.
|
|
*/
|
|
//non empty array is truthy, empty array is falsy
|
|
if (dust.isArray(elem)) {
|
|
if (body) {
|
|
var len = elem.length, chunk = this;
|
|
if (len > 0) {
|
|
// any custom helper can blow up the stack
|
|
// and store a flattened context, guard defensively
|
|
if(context.stack.head) {
|
|
context.stack.head['$len'] = len;
|
|
}
|
|
for (var i=0; i<len; i++) {
|
|
if(context.stack.head) {
|
|
context.stack.head['$idx'] = i;
|
|
}
|
|
chunk = body(chunk, context.push(elem[i], i, len));
|
|
}
|
|
if(context.stack.head) {
|
|
context.stack.head['$idx'] = undefined;
|
|
context.stack.head['$len'] = undefined;
|
|
}
|
|
return chunk;
|
|
}
|
|
else if (skip) {
|
|
return skip(this, context);
|
|
}
|
|
}
|
|
} else if (elem === true) {
|
|
// true is truthy but does not change context
|
|
if (body) {
|
|
return body(this, context);
|
|
}
|
|
} else if (elem || elem === 0) {
|
|
// everything that evaluates to true are truthy ( e.g. Non-empty strings and Empty objects are truthy. )
|
|
// zero is truthy
|
|
// for anonymous functions that did not returns a chunk, truthiness is evaluated based on the return value
|
|
if (body) {
|
|
return body(this, context.push(elem));
|
|
}
|
|
// nonexistent, scalar false value, scalar empty string, null,
|
|
// undefined are all falsy
|
|
} else if (skip) {
|
|
return skip(this, context);
|
|
}
|
|
dust.log('Not rendering section (#) block in template [' + context.getTemplateName() + '], because above key was not found', DEBUG);
|
|
return this;
|
|
};
|
|
|
|
Chunk.prototype.exists = function(elem, context, bodies) {
|
|
var body = bodies.block,
|
|
skip = bodies['else'];
|
|
|
|
if (!dust.isEmpty(elem)) {
|
|
if (body) {
|
|
return body(this, context);
|
|
}
|
|
} else if (skip) {
|
|
return skip(this, context);
|
|
}
|
|
dust.log('Not rendering exists (?) block in template [' + context.getTemplateName() + '], because above key was not found', DEBUG);
|
|
return this;
|
|
};
|
|
|
|
Chunk.prototype.notexists = function(elem, context, bodies) {
|
|
var body = bodies.block,
|
|
skip = bodies['else'];
|
|
|
|
if (dust.isEmpty(elem)) {
|
|
if (body) {
|
|
return body(this, context);
|
|
}
|
|
} else if (skip) {
|
|
return skip(this, context);
|
|
}
|
|
dust.log('Not rendering not exists (^) block check in template [' + context.getTemplateName() + '], because above key was found', DEBUG);
|
|
return this;
|
|
};
|
|
|
|
Chunk.prototype.block = function(elem, context, bodies) {
|
|
var body = bodies.block;
|
|
|
|
if (elem) {
|
|
body = elem;
|
|
}
|
|
|
|
if (body) {
|
|
return body(this, context);
|
|
}
|
|
return this;
|
|
};
|
|
|
|
Chunk.prototype.partial = function(elem, context, params) {
|
|
var partialContext;
|
|
//put the params context second to match what section does. {.} matches the current context without parameters
|
|
// start with an empty context
|
|
partialContext = dust.makeBase(context.global);
|
|
partialContext.blocks = context.blocks;
|
|
if (context.stack && context.stack.tail){
|
|
// grab the stack(tail) off of the previous context if we have it
|
|
partialContext.stack = context.stack.tail;
|
|
}
|
|
if (params){
|
|
//put params on
|
|
partialContext = partialContext.push(params);
|
|
}
|
|
|
|
if(typeof elem === 'string') {
|
|
partialContext.templateName = elem;
|
|
}
|
|
|
|
//reattach the head
|
|
partialContext = partialContext.push(context.stack.head);
|
|
|
|
var partialChunk;
|
|
if (typeof elem === 'function') {
|
|
partialChunk = this.capture(elem, partialContext, function(name, chunk) {
|
|
partialContext.templateName = partialContext.templateName || name;
|
|
dust.load(name, chunk, partialContext).end();
|
|
});
|
|
} else {
|
|
partialChunk = dust.load(elem, this, partialContext);
|
|
}
|
|
return partialChunk;
|
|
};
|
|
|
|
Chunk.prototype.helper = function(name, context, bodies, params) {
|
|
var chunk = this;
|
|
// handle invalid helpers, similar to invalid filters
|
|
if(dust.helpers[name]) {
|
|
try {
|
|
return dust.helpers[name](chunk, context, bodies, params);
|
|
} catch(e) {
|
|
dust.log('Error in ' + name + ' helper: ' + e, ERROR);
|
|
return chunk.setError(e);
|
|
}
|
|
} else {
|
|
dust.log('Invalid helper [' + name + ']', WARN);
|
|
return chunk;
|
|
}
|
|
};
|
|
|
|
Chunk.prototype.capture = function(body, context, callback) {
|
|
return this.map(function(chunk) {
|
|
var stub = new Stub(function(err, out) {
|
|
if (err) {
|
|
chunk.setError(err);
|
|
} else {
|
|
callback(out, chunk);
|
|
}
|
|
});
|
|
body(stub.head, context).end();
|
|
});
|
|
};
|
|
|
|
Chunk.prototype.setError = function(err) {
|
|
this.error = err;
|
|
this.root.flush();
|
|
return this;
|
|
};
|
|
|
|
function Tap(head, tail) {
|
|
this.head = head;
|
|
this.tail = tail;
|
|
}
|
|
|
|
Tap.prototype.push = function(tap) {
|
|
return new Tap(tap, this);
|
|
};
|
|
|
|
Tap.prototype.go = function(value) {
|
|
var tap = this;
|
|
|
|
while(tap) {
|
|
value = tap.head(value);
|
|
tap = tap.tail;
|
|
}
|
|
return value;
|
|
};
|
|
|
|
var HCHARS = new RegExp(/[&<>\"\']/),
|
|
AMP = /&/g,
|
|
LT = /</g,
|
|
GT = />/g,
|
|
QUOT = /\"/g,
|
|
SQUOT = /\'/g;
|
|
|
|
dust.escapeHtml = function(s) {
|
|
if (typeof s === 'string') {
|
|
if (!HCHARS.test(s)) {
|
|
return s;
|
|
}
|
|
return s.replace(AMP,'&').replace(LT,'<').replace(GT,'>').replace(QUOT,'"').replace(SQUOT, ''');
|
|
}
|
|
return s;
|
|
};
|
|
|
|
var BS = /\\/g,
|
|
FS = /\//g,
|
|
CR = /\r/g,
|
|
LS = /\u2028/g,
|
|
PS = /\u2029/g,
|
|
NL = /\n/g,
|
|
LF = /\f/g,
|
|
SQ = /'/g,
|
|
DQ = /"/g,
|
|
TB = /\t/g;
|
|
|
|
dust.escapeJs = function(s) {
|
|
if (typeof s === 'string') {
|
|
return s
|
|
.replace(BS, '\\\\')
|
|
.replace(FS, '\\/')
|
|
.replace(DQ, '\\"')
|
|
.replace(SQ, '\\\'')
|
|
.replace(CR, '\\r')
|
|
.replace(LS, '\\u2028')
|
|
.replace(PS, '\\u2029')
|
|
.replace(NL, '\\n')
|
|
.replace(LF, '\\f')
|
|
.replace(TB, '\\t');
|
|
}
|
|
return s;
|
|
};
|
|
|
|
|
|
if (typeof exports === 'object') {
|
|
module.exports = dust;
|
|
} else {
|
|
root.dust = dust;
|
|
}
|
|
|
|
})((function(){return this;})());
|