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+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var debug = require('debug')('express:view');
+var path = require('path');
+var fs = require('fs');
+var utils = require('./utils');
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var dirname = path.dirname;
+var basename = path.basename;
+var extname = path.extname;
+var join = path.join;
+var resolve = path.resolve;
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = View;
+
+/**
+ * Initialize a new `View` with the given `name`.
+ *
+ * Options:
+ *
+ * - `defaultEngine` the default template engine name
+ * - `engines` template engine require() cache
+ * - `root` root path for view lookup
+ *
+ * @param {string} name
+ * @param {object} options
+ * @public
+ */
+
+function View(name, options) {
+ var opts = options || {};
+
+ this.defaultEngine = opts.defaultEngine;
+ this.ext = extname(name);
+ this.name = name;
+ this.root = opts.root;
+
+ if (!this.ext && !this.defaultEngine) {
+ throw new Error('No default engine was specified and no extension was provided.');
+ }
+
+ var fileName = name;
+
+ if (!this.ext) {
+ // get extension from default engine name
+ this.ext = this.defaultEngine[0] !== '.'
+ ? '.' + this.defaultEngine
+ : this.defaultEngine;
+
+ fileName += this.ext;
+ }
+
+ if (!opts.engines[this.ext]) {
+ // load engine
+ opts.engines[this.ext] = require(this.ext.substr(1)).__express;
+ }
+
+ // store loaded engine
+ this.engine = opts.engines[this.ext];
+
+ // lookup path
+ this.path = this.lookup(fileName);
+}
+
+/**
+ * Lookup view by the given `name`
+ *
+ * @param {string} name
+ * @private
+ */
+
+View.prototype.lookup = function lookup(name) {
+ var path;
+ var roots = [].concat(this.root);
+
+ debug('lookup "%s"', name);
+
+ for (var i = 0; i < roots.length && !path; i++) {
+ var root = roots[i];
+
+ // resolve the path
+ var loc = resolve(root, name);
+ var dir = dirname(loc);
+ var file = basename(loc);
+
+ // resolve the file
+ path = this.resolve(dir, file);
+ }
+
+ return path;
+};
+
+/**
+ * Render with the given options.
+ *
+ * @param {object} options
+ * @param {function} callback
+ * @private
+ */
+
+View.prototype.render = function render(options, callback) {
+ debug('render "%s"', this.path);
+ this.engine(this.path, options, callback);
+};
+
+/**
+ * Resolve the file within the given directory.
+ *
+ * @param {string} dir
+ * @param {string} file
+ * @private
+ */
+
+View.prototype.resolve = function resolve(dir, file) {
+ var ext = this.ext;
+
+ // <path>.<ext>
+ var path = join(dir, file);
+ var stat = tryStat(path);
+
+ if (stat && stat.isFile()) {
+ return path;
+ }
+
+ // <path>/index.<ext>
+ path = join(dir, basename(file, ext), 'index' + ext);
+ stat = tryStat(path);
+
+ if (stat && stat.isFile()) {
+ return path;
+ }
+};
+
+/**
+ * Return a stat, maybe.
+ *
+ * @param {string} path
+ * @return {fs.Stats}
+ * @private
+ */
+
+function tryStat(path) {
+ debug('stat "%s"', path);
+
+ try {
+ return fs.statSync(path);
+ } catch (e) {
+ return undefined;
+ }
+}