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Add new Stream() class to expose a duplex stream #11

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Add new Stream() class to expose a duplex stream #11

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1 change: 1 addition & 0 deletions lib/index.js
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Original file line number Diff line number Diff line change
@@ -1 +1,2 @@
module.exports.SaXPath = require('./saxpath');
module.exports.Stream = require('./stream');
22 changes: 22 additions & 0 deletions lib/stream.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
var stream = require('stream');
var duplexify = require('duplexify');
var SaXPath = require('./saxpath');

function createReadable(streamer, args) {
var readable = new stream.Readable(args);
streamer.on('match', function(chunk) {
readable.push(chunk);
});
streamer.on('end', function() {
readable.push(null);
});
readable._read = function(n) {
};
return readable;
}

module.exports = function SaXPathStream(saxParser, xpath, recorder, streamArgs) {
var streamer = new SaXPath(saxParser, xpath, recorder);
var readable = createReadable(streamer, streamArgs);
return duplexify(saxParser, readable, streamArgs);
};
3 changes: 2 additions & 1 deletion package.json
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Expand Up @@ -10,14 +10,15 @@
"url": "https://raw.github.com/StevenLooman/saxpath/master/LICENSE"
}
],

"dependencies": {
"duplexify": "~3.2.0"
},
"devDependencies": {
"sax": "0.5.4",
"pegjs": "0.7.0",
"mocha": "1.12.0",
"jscover": "0.2.4",
"mocha": "~2.1.0",
"mocha-lcov-reporter": "0.0.1"
},
"directories": {
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67 changes: 67 additions & 0 deletions test/stream.js
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var util = require('util');
var assert = require('assert');
var XMLrecorder = require('../lib/xml_recorder.js');

var fs = require('fs');
var sax = require('sax');
var saxpath = process.env.JS_COV ? require('../lib-cov') : require('../lib');


describe('Stream', function() {

it('should be a duplex stream emitting XML chunks', function(done) {
var fileStream = fs.createReadStream('test/bookstore.xml');
var saxParser = sax.createStream(true);
var streamer = new saxpath.Stream(saxParser, '//book');

var list = [];
fileStream.pipe(streamer)
.on('data', function(data) {
assert.ok(Buffer.isBuffer(data));
list.push(data.toString());
})
.on('end', function() {
assert.equal(list.length, 4);
assert.notEqual(list[0].indexOf('COOKING'), -1);
assert.notEqual(list[1].indexOf('Harry Potter'), -1);
assert.notEqual(list[2].indexOf('Kurt Cagle'), -1);
assert.notEqual(list[3].indexOf('39.95'), -1);
done();
});
});

it('can emit objects if the recorder is setup that way', function(done) {
var fileStream = fs.createReadStream('test/bookstore.xml');
var saxParser = sax.createStream(true);
var recorder = new IndexRecorder();
var streamer = new saxpath.Stream(saxParser, '//book', recorder, {objectMode: true});

fileStream
.pipe(streamer)
.on('data', function(data) {
assert.equal(typeof data, 'object');
assert.ok(data.index >= 0);
assert.ok(data.index < 4);
})
.on('end', function() {
assert.equal(recorder.index, 3);
done();
});
});

});

var IndexRecorder = function () {
XMLrecorder.call(this);
this.index = -1;
};

util.inherits(IndexRecorder, XMLrecorder);

IndexRecorder.prototype.start = function() {
++this.index;
};

IndexRecorder.prototype.stop = function() {
return { index: this.index };
};