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/*!
* Express - View
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var path = require('path')
, utils = require('../utils')
, extname = path.extname
, dirname = path.dirname
, basename = path.basename
, fs = require('fs')
, stat = fs.statSync;
/**
* Expose `View`.
*/
exports = module.exports = View;
/**
* Require cache.
*/
var cache = {};
/**
* Initialize a new `View` with the given `view` path and `options`.
*
* @param {String} view
* @param {Object} options
* @api private
*/
function View(view, options) {
options = options || {};
this.view = view;
this.root = options.root;
this.relative = false !== options.relative;
this.defaultEngine = options.defaultEngine;
this.parent = options.parentView;
this.basename = basename(view);
this.engine = this.resolveEngine();
this.extension = '.' + this.engine;
this.name = this.basename.replace(this.extension, '');
this.path = this.resolvePath();
this.dirname = dirname(this.path);
if (options.attempts) {
if (!~options.attempts.indexOf(this.path))
options.attempts.push(this.path);
}
};
/**
* Check if the view path exists.
*
* @return {Boolean}
* @api public
*/
View.prototype.__defineGetter__('exists', function(){
try {
stat(this.path);
return true;
} catch (err) {
return false;
}
});
/**
* Resolve view engine.
*
* @return {String}
* @api private
*/
View.prototype.resolveEngine = function(){
// Explicit
if (~this.basename.indexOf('.')) return extname(this.basename).substr(1);
// Inherit from parent
if (this.parent) return this.parent.engine;
// Default
return this.defaultEngine;
};
/**
* Resolve view path.
*
* @return {String}
* @api private
*/
View.prototype.resolvePath = function(){
var path = this.view;
// Implicit engine
if (!~this.basename.indexOf('.')) path += this.extension;
// Absolute
if (utils.isAbsolute(path)) return path;
// Relative to parent
if (this.relative && this.parent) return this.parent.dirname + '/' + path;
// Relative to root
return this.root
? this.root + '/' + path
: path;
};
/**
* Get view contents. This is a one-time hit, so we
* can afford to be sync.
*
* @return {String}
* @api public
*/
View.prototype.__defineGetter__('contents', function(){
return fs.readFileSync(this.path, 'utf8');
});
/**
* Get template engine api, cache exports to reduce
* require() calls.
*
* @return {Object}
* @api public
*/
View.prototype.__defineGetter__('templateEngine', function(){
var ext = this.extension;
return cache[ext] || (cache[ext] = require(this.engine));
});
/**
* Return root path alternative.
*
* @return {String}
* @api public
*/
View.prototype.__defineGetter__('rootPath', function(){
this.relative = false;
return this.resolvePath();
});
/**
* Return index path alternative.
*
* @return {String}
* @api public
*/
View.prototype.__defineGetter__('indexPath', function(){
return this.dirname
+ '/' + this.basename.replace(this.extension, '')
+ '/index' + this.extension;
});
/**
* Return ../<name>/index path alternative.
*
* @return {String}
* @api public
*/
View.prototype.__defineGetter__('upIndexPath', function(){
return this.dirname + '/../' + this.name + '/index' + this.extension;
});
/**
* Return _ prefix path alternative
*
* @return {String}
* @api public
*/
View.prototype.__defineGetter__('prefixPath', function(){
return this.dirname + '/_' + this.basename;
});
/**
* Register the given template engine `exports`
* as `ext`. For example we may wish to map ".html"
* files to jade:
*
* app.register('.html', require('jade'));
*
* or
*
* app.register('html', require('jade'));
*
* This is also useful for libraries that may not
* match extensions correctly. For example my haml.js
* library is installed from npm as "hamljs" so instead
* of layout.hamljs, we can register the engine as ".haml":
*
* app.register('.haml', require('haml-js'));
*
* @param {String} ext
* @param {Object} obj
* @api public
*/
exports.register = function(ext, exports) {
if ('.' != ext[0]) ext = '.' + ext;
cache[ext] = exports;
};