source: trip-planner-front/node_modules/express/lib/view.js

Last change on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/*!
2 * express
3 * Copyright(c) 2009-2013 TJ Holowaychuk
4 * Copyright(c) 2013 Roman Shtylman
5 * Copyright(c) 2014-2015 Douglas Christopher Wilson
6 * MIT Licensed
7 */
8
9'use strict';
10
11/**
12 * Module dependencies.
13 * @private
14 */
15
16var debug = require('debug')('express:view');
17var path = require('path');
18var fs = require('fs');
19
20/**
21 * Module variables.
22 * @private
23 */
24
25var dirname = path.dirname;
26var basename = path.basename;
27var extname = path.extname;
28var join = path.join;
29var resolve = path.resolve;
30
31/**
32 * Module exports.
33 * @public
34 */
35
36module.exports = View;
37
38/**
39 * Initialize a new `View` with the given `name`.
40 *
41 * Options:
42 *
43 * - `defaultEngine` the default template engine name
44 * - `engines` template engine require() cache
45 * - `root` root path for view lookup
46 *
47 * @param {string} name
48 * @param {object} options
49 * @public
50 */
51
52function View(name, options) {
53 var opts = options || {};
54
55 this.defaultEngine = opts.defaultEngine;
56 this.ext = extname(name);
57 this.name = name;
58 this.root = opts.root;
59
60 if (!this.ext && !this.defaultEngine) {
61 throw new Error('No default engine was specified and no extension was provided.');
62 }
63
64 var fileName = name;
65
66 if (!this.ext) {
67 // get extension from default engine name
68 this.ext = this.defaultEngine[0] !== '.'
69 ? '.' + this.defaultEngine
70 : this.defaultEngine;
71
72 fileName += this.ext;
73 }
74
75 if (!opts.engines[this.ext]) {
76 // load engine
77 var mod = this.ext.substr(1)
78 debug('require "%s"', mod)
79
80 // default engine export
81 var fn = require(mod).__express
82
83 if (typeof fn !== 'function') {
84 throw new Error('Module "' + mod + '" does not provide a view engine.')
85 }
86
87 opts.engines[this.ext] = fn
88 }
89
90 // store loaded engine
91 this.engine = opts.engines[this.ext];
92
93 // lookup path
94 this.path = this.lookup(fileName);
95}
96
97/**
98 * Lookup view by the given `name`
99 *
100 * @param {string} name
101 * @private
102 */
103
104View.prototype.lookup = function lookup(name) {
105 var path;
106 var roots = [].concat(this.root);
107
108 debug('lookup "%s"', name);
109
110 for (var i = 0; i < roots.length && !path; i++) {
111 var root = roots[i];
112
113 // resolve the path
114 var loc = resolve(root, name);
115 var dir = dirname(loc);
116 var file = basename(loc);
117
118 // resolve the file
119 path = this.resolve(dir, file);
120 }
121
122 return path;
123};
124
125/**
126 * Render with the given options.
127 *
128 * @param {object} options
129 * @param {function} callback
130 * @private
131 */
132
133View.prototype.render = function render(options, callback) {
134 debug('render "%s"', this.path);
135 this.engine(this.path, options, callback);
136};
137
138/**
139 * Resolve the file within the given directory.
140 *
141 * @param {string} dir
142 * @param {string} file
143 * @private
144 */
145
146View.prototype.resolve = function resolve(dir, file) {
147 var ext = this.ext;
148
149 // <path>.<ext>
150 var path = join(dir, file);
151 var stat = tryStat(path);
152
153 if (stat && stat.isFile()) {
154 return path;
155 }
156
157 // <path>/index.<ext>
158 path = join(dir, basename(file, ext), 'index' + ext);
159 stat = tryStat(path);
160
161 if (stat && stat.isFile()) {
162 return path;
163 }
164};
165
166/**
167 * Return a stat, maybe.
168 *
169 * @param {string} path
170 * @return {fs.Stats}
171 * @private
172 */
173
174function tryStat(path) {
175 debug('stat "%s"', path);
176
177 try {
178 return fs.statSync(path);
179 } catch (e) {
180 return undefined;
181 }
182}
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