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/*
Copyright (c) 2012, Yahoo! Inc. All rights reserved.
Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
*/
var path = require('path'),
util = require('util'),
fs = require('fs'),
async = require('async'),
mkdirp = require('mkdirp'),
writer = require('./writer'),
Writer = writer.Writer,
ContentWriter = writer.ContentWriter;
function extend(cons, proto) {
Object.keys(proto).forEach(function (k) {
cons.prototype[k] = proto[k];
});
}
function BufferedContentWriter() {
ContentWriter.call(this);
this.content = '';
}
util.inherits(BufferedContentWriter, ContentWriter);
extend(BufferedContentWriter, {
write: function (str) {
this.content += str;
},
getContent: function () {
return this.content;
}
});
function StreamContentWriter(stream) {
ContentWriter.call(this);
this.stream = stream;
}
util.inherits(StreamContentWriter, ContentWriter);
extend(StreamContentWriter, {
write: function (str) {
this.stream.write(str);
}
});
function SyncFileWriter() {
Writer.call(this);
}
util.inherits(SyncFileWriter, Writer);
extend(SyncFileWriter, {
writeFile: function (file, callback) {
mkdirp.sync(path.dirname(file));
var cw = new BufferedContentWriter();
callback(cw);
fs.writeFileSync(file, cw.getContent(), 'utf8');
},
done: function () {
this.emit('done'); //everything already done
}
});
function AsyncFileWriter() {
this.queue = async.queue(this.processFile.bind(this), 20);
this.openFileMap = {};
}
util.inherits(AsyncFileWriter, Writer);
extend(AsyncFileWriter, {
writeFile: function (file, callback) {
this.openFileMap[file] = true;
this.queue.push({ file: file, callback: callback });
},
processFile: function (task, cb) {
var file = task.file,
userCallback = task.callback,
that = this,
stream,
contentWriter;
mkdirp.sync(path.dirname(file));
stream = fs.createWriteStream(file);
stream.on('close', function () {
delete that.openFileMap[file];
cb();
that.checkDone();
});
stream.on('error', function (err) { that.emit('error', err); });
contentWriter = new StreamContentWriter(stream);
userCallback(contentWriter);
stream.end();
},
done: function () {
this.doneCalled = true;
this.checkDone();
},
checkDone: function () {
if (!this.doneCalled) { return; }
if (Object.keys(this.openFileMap).length === 0) {
this.emit('done');
}
}
});
/**
* a concrete writer implementation that can write files synchronously or
* asynchronously based on the constructor argument passed to it.
*
* Usage
* -----
*
* var sync = true,
* fileWriter = new require('istanbul').FileWriter(sync);
*
* fileWriter.on('done', function () { console.log('done'); });
* fileWriter.copyFile('/foo/bar.jpg', '/baz/bar.jpg');
* fileWriter.writeFile('/foo/index.html', function (contentWriter) {
* contentWriter.println('<html>');
* contentWriter.println('</html>');
* });
* fileWriter.done(); // will emit the `done` event when all files are written
*
* @class FileWriter
* @extends Writer
* @module io
* @param sync
* @constructor
*/
function FileWriter(sync) {
Writer.call(this);
var that = this;
this.delegate = sync ? new SyncFileWriter() : new AsyncFileWriter();
this.delegate.on('error', function (err) { that.emit('error', err); });
this.delegate.on('done', function () { that.emit('done'); });
}
util.inherits(FileWriter, Writer);
extend(FileWriter, {
copyFile: function (source, dest) {
mkdirp.sync(path.dirname(dest));
fs.writeFileSync(dest, fs.readFileSync(source));
},
writeFile: function (file, callback) {
this.delegate.writeFile(file, callback);
},
done: function () {
this.delegate.done();
}
});
module.exports = FileWriter;
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