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163 lines
4.9 KiB
JavaScript

var Promise = require('promise');
var fs = require('fs');
var path = require('path');
var normalize = path.normalize;
Promise.prototype.nodeify = function (cb) {
if (typeof cb === 'function') {
this.then(function (res) { process.nextTick(function () { cb(null, res); }); },
function (err) { process.nextTick(function () { cb(err); }); });
return undefined;
} else {
return this;
}
}
var minifiers = {};
module.exports = Transformer;
function Transformer(obj) {
this.name = obj.name;
this.engines = obj.engines;
this.isBinary = obj.isBinary || false;
this.isMinifier = obj.isMinifier || false;
this.outputFormat = obj.outputFormat;
this._cache = {};
if (typeof obj.async === 'function') {
this._renderAsync = obj.async;
this.sudoSync = obj.sudoSync || false;
}
if (typeof obj.sync === 'function') {
this._renderSync = obj.sync;
this.sync = true;
} else {
this.sync = obj.sudoSync || false;
}
if (this.isMinifier)
minifiers[this.outputFormat] = this;
else {
var minifier = minifiers[this.outputFormat];
if (minifier) {
this.minify = function(str, options) {
if (options && options.minify)
return minifier.renderSync(str, typeof options.minify === 'object' && options.minify || {});
return str;
}
}
}
}
Transformer.prototype.cache = function (options, data) {
if (options.cache && options.filename) {
if (data) return this.cache[options.filename] = data;
else return this.cache[options.filename];
} else {
return data;
}
};
Transformer.prototype.loadModule = function () {
if (this.engine) return this.engine;
for (var i = 0; i < this.engines.length; i++) {
try {
var res = this.engines[i] === '.' ? null : (this.engine = require(this.engines[i]));
this.engineName = this.engines[i];
return res;
} catch (ex) {
if (this.engines.length === 1) {
throw ex;
}
}
}
throw new Error('In order to apply the transform ' + this.name + ' you must install one of ' + this.engines.map(function (e) { return '"' + e + '"'; }).join());
};
Transformer.prototype.minify = function(str, options) {
return str;
}
Transformer.prototype.renderSync = function (str, options) {
options = options || {};
options = clone(options);
this.loadModule();
if (this._renderSync) {
return this.minify(this._renderSync((this.isBinary ? str : fixString(str)), options), options);
} else if (this.sudoSync) {
options.sudoSync = true;
var res, err;
this._renderAsync((this.isBinary ? str : fixString(str)), options, function (e, val) {
if (e) err = e;
else res = val;
});
if (err) throw err;
else if (res != undefined) return this.minify(res, options);
else if (typeof this.sudoSync === 'string') throw new Error(this.sudoSync.replace(/FILENAME/g, options.filename || ''));
else throw new Error('There was a problem transforming ' + (options.filename || '') + ' syncronously using ' + this.name);
} else {
throw new Error(this.name + ' does not support transforming syncronously.');
}
};
Transformer.prototype.render = function (str, options, cb) {
options = options || {};
var self = this;
return new Promise(function (resolve, reject) {
self.loadModule();
if (self._renderAsync) {
self._renderAsync((self.isBinary ? str : fixString(str)), clone(options), function (err, val) {
if (err) reject(err);
else resolve(self.minify(val, options));
})
} else {
resolve(self.renderSync(str, options));
}
})
.nodeify(cb);
};
Transformer.prototype.renderFile = function (path, options, cb) {
options = options || {};
var self = this;
return new Promise(function (resolve, reject) {
options.filename = (path = normalize(path));
if (self._cache[path])
resolve(null);
else
fs.readFile(path, function (err, data) {
if (err) reject(err);
else resolve(data);
})
})
.then(function (str) {
return self.render(str, options);
})
.nodeify(cb);
};
Transformer.prototype.renderFileSync = function (path, options) {
options = options || {};
options.filename = (path = normalize(path));
return this.renderSync((this._cache[path] ? null : fs.readFileSync(path)), options);
};
function fixString(str) {
if (str == null) return str;
//convert buffer to string
str = str.toString();
// Strip UTF-8 BOM if it exists
str = (0xFEFF == str.charCodeAt(0)
? str.substring(1)
: str);
//remove `\r` added by windows
return str.replace(/\r/g, '');
}
function clone(obj) {
if (Array.isArray(obj)) {
return obj.map(clone);
} else if (obj && typeof obj === 'object') {
var res = {};
for (var key in obj) {
res[key] = clone(obj[key]);
}
return res;
} else {
return obj;
}
}