183 lines
3.2 KiB
JavaScript
183 lines
3.2 KiB
JavaScript
/*!
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* express
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* Copyright(c) 2009-2013 TJ Holowaychuk
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* Copyright(c) 2013 Roman Shtylman
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* Copyright(c) 2014-2015 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict';
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/**
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* Module dependencies.
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* @private
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*/
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var debug = require('debug')('express:view');
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var path = require('path');
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var fs = require('fs');
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/**
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* Module variables.
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* @private
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*/
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var dirname = path.dirname;
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var basename = path.basename;
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var extname = path.extname;
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var join = path.join;
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var resolve = path.resolve;
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/**
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* Module exports.
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* @public
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*/
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module.exports = View;
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/**
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* Initialize a new `View` with the given `name`.
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*
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* Options:
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*
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* - `defaultEngine` the default template engine name
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* - `engines` template engine require() cache
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* - `root` root path for view lookup
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*
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* @param {string} name
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* @param {object} options
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* @public
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*/
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function View(name, options) {
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var opts = options || {};
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this.defaultEngine = opts.defaultEngine;
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this.ext = extname(name);
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this.name = name;
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this.root = opts.root;
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if (!this.ext && !this.defaultEngine) {
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throw new Error('No default engine was specified and no extension was provided.');
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}
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var fileName = name;
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if (!this.ext) {
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// get extension from default engine name
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this.ext = this.defaultEngine[0] !== '.'
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? '.' + this.defaultEngine
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: this.defaultEngine;
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fileName += this.ext;
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}
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if (!opts.engines[this.ext]) {
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// load engine
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var mod = this.ext.slice(1)
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debug('require "%s"', mod)
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// default engine export
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var fn = require(mod).__express
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if (typeof fn !== 'function') {
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throw new Error('Module "' + mod + '" does not provide a view engine.')
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}
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opts.engines[this.ext] = fn
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}
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// store loaded engine
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this.engine = opts.engines[this.ext];
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// lookup path
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this.path = this.lookup(fileName);
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}
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/**
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* Lookup view by the given `name`
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*
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* @param {string} name
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* @private
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*/
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View.prototype.lookup = function lookup(name) {
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var path;
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var roots = [].concat(this.root);
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debug('lookup "%s"', name);
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for (var i = 0; i < roots.length && !path; i++) {
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var root = roots[i];
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// resolve the path
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var loc = resolve(root, name);
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var dir = dirname(loc);
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var file = basename(loc);
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// resolve the file
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path = this.resolve(dir, file);
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}
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return path;
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};
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/**
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* Render with the given options.
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*
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* @param {object} options
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* @param {function} callback
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* @private
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*/
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View.prototype.render = function render(options, callback) {
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debug('render "%s"', this.path);
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this.engine(this.path, options, callback);
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};
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/**
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* Resolve the file within the given directory.
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*
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* @param {string} dir
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* @param {string} file
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* @private
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*/
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View.prototype.resolve = function resolve(dir, file) {
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var ext = this.ext;
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// <path>.<ext>
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var path = join(dir, file);
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var stat = tryStat(path);
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if (stat && stat.isFile()) {
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return path;
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}
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// <path>/index.<ext>
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path = join(dir, basename(file, ext), 'index' + ext);
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stat = tryStat(path);
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if (stat && stat.isFile()) {
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return path;
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}
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};
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/**
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* Return a stat, maybe.
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*
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* @param {string} path
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* @return {fs.Stats}
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* @private
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*/
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function tryStat(path) {
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debug('stat "%s"', path);
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try {
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return fs.statSync(path);
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} catch (e) {
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return undefined;
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}
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}
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