File: platform/classes/Q/Mustache.js

/**
 * @module Q
 */
 
var Q = require('../Q');
var fs = require('fs');
var mustache = require('mustache');

var _loaders;
var _partials;
var _templates = {};

var _ext = Q.Config.get(['Q', 'extensions', 'mustache'], '.mustache');

function _loader(path) {
	return function(name) {
		if (name.slice(-_ext.length) !== _ext) {
			name += _ext;
		}
		if (fs.existsSync(path+Q.DS+name)) {
			return fs.readFileSync(path+Q.DS+name, 'utf8');
		}
	};
}

function _getLoaders() {
	if (_loaders === undefined) {
		_loaders = []; _partials = [];
		if (fs.existsSync(Q.VIEWS_DIR)) {
			_loaders.unshift(_loader(Q.VIEWS_DIR));
		}
		if (fs.existsSync(Q.VIEWS_DIR+Q.DS+'partials')) {
			_partials.unshift(_loader(Q.VIEWS_DIR+Q.DS+'partials'));
		}
		var plugins = Q.Config.get(['Q', 'plugins'], []);
		for (i=0; i<plugins.length; i++) {
			path = Q.pluginInfo[plugins[i]].VIEWS_DIR;
			if (fs.existsSync(path)) {
				_loaders.unshift(_loader(path));
			}
			if (fs.existsSync(path+Q.DS+'partials')) {
				_partials.unshift(_loader(path+Q.DS+'partials'));
			}
		}
		if (fs.existsSync(Q.app.VIEWS_DIR)) {
			_loaders.unshift(_loader(Q.app.VIEWS_DIR));
		}
		if (fs.existsSync(Q.app.VIEWS_DIR+Q.DS+'partials')) {
			_partials.unshift(_loader(Q.app.VIEWS_DIR+Q.DS+'partials'));
		}
	}
	return _loaders;
}

/**
 * Creates a Q.Mustache object
 * @class Mustache
 * @namespace Q
 */
module.exports = {

	/**
	 * Search for mustache template
	 * @method template
	 * @param {string} path The template name
	 * @return {string|null}
	 */
	template: function (path) {
		if (_templates[path]) return _templates[path];
		var i, tpl = null, loaders = _getLoaders();
		for (i=0; i<loaders.length; i++) {
			if ((tpl = loaders[i](path))) break;
		}
		return tpl ? (_templates[path] = tpl.toString()) : null;
	},

	/**
	 * Render mustache template
	 * @method render
	 * @param {string} template The template name
	 * @param {object} data Optional. The data to render
	 * @param {Array} partials Optional. The names of partials to load and use for rendering.
	 * @return {string|null}
	 */
	render: function(tPath, data, partials) {
		if (!tPath) return null;
		var i, tpl = this.template(tPath), part = {}, path;

		if (!tpl) return null;

		if (partials) {
			_getLoaders();
			for (i=0; i<partials.length; i++) {
				var path = partials[i];
				for (j=0; j<_partials.length; j++) {
					if (part[path] = _partials[j](path)) {
						break;
					}
				}
				if (part[path]) {
					part[path] = part[path].toString();
				}
			}
		}
		return mustache.render(tpl, data, part);
	},

	/**
	 * Render mustache literal source string
	 * @method render
	 * @param {string} content The source content
	 * @param {object} data Optional. The data to render
	 * @param {Array} partials Optional. The names of partials to load and use for rendering.
	 * @return {string|null}
	 */
	renderSource: function(content, data, partials) {
		var i, path, part = {};

		if (partials) {
			for (i=0; i<partials.length; i++) {
				var path = partials[i];
				for (j=0; j<_partials.length; j++) {
					if (part[path] = _partials[j](path)) {
						break;
					}
				}
				if (part[path]) {
					part[path] = part[path].toString();
				}
			}
		}
		return mustache.render(content, data, part);
	}
};