mirror of
https://github.com/musix-org/musix-oss
synced 2024-11-14 03:30:18 +00:00
88 lines
2.3 KiB
Markdown
88 lines
2.3 KiB
Markdown
|
Description
|
||
|
|
===========
|
||
|
|
|
||
|
|
streamsearch is a module for [node.js](http://nodejs.org/) that allows searching a stream using the Boyer-Moore-Horspool algorithm.
|
||
|
|
|
||
|
|
This module is based heavily on the Streaming Boyer-Moore-Horspool C++ implementation by Hongli Lai [here](https://github.com/FooBarWidget/boyer-moore-horspool).
|
||
|
|
|
||
|
|
|
||
|
|
Requirements
|
||
|
|
============
|
||
|
|
|
||
|
|
* [node.js](http://nodejs.org/) -- v0.8.0 or newer
|
||
|
|
|
||
|
|
|
||
|
|
Installation
|
||
|
|
============
|
||
|
|
|
||
|
|
npm install streamsearch
|
||
|
|
|
||
|
|
Example
|
||
|
|
=======
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var StreamSearch = require('streamsearch'),
|
||
|
|
inspect = require('util').inspect;
|
||
|
|
|
||
|
|
var needle = new Buffer([13, 10]), // CRLF
|
||
|
|
s = new StreamSearch(needle),
|
||
|
|
chunks = [
|
||
|
|
new Buffer('foo'),
|
||
|
|
new Buffer(' bar'),
|
||
|
|
new Buffer('\r'),
|
||
|
|
new Buffer('\n'),
|
||
|
|
new Buffer('baz, hello\r'),
|
||
|
|
new Buffer('\n world.'),
|
||
|
|
new Buffer('\r\n Node.JS rules!!\r\n\r\n')
|
||
|
|
];
|
||
|
|
s.on('info', function(isMatch, data, start, end) {
|
||
|
|
if (data)
|
||
|
|
console.log('data: ' + inspect(data.toString('ascii', start, end)));
|
||
|
|
if (isMatch)
|
||
|
|
console.log('match!');
|
||
|
|
});
|
||
|
|
for (var i = 0, len = chunks.length; i < len; ++i)
|
||
|
|
s.push(chunks[i]);
|
||
|
|
|
||
|
|
// output:
|
||
|
|
//
|
||
|
|
// data: 'foo'
|
||
|
|
// data: ' bar'
|
||
|
|
// match!
|
||
|
|
// data: 'baz, hello'
|
||
|
|
// match!
|
||
|
|
// data: ' world.'
|
||
|
|
// match!
|
||
|
|
// data: ' Node.JS rules!!'
|
||
|
|
// match!
|
||
|
|
// data: ''
|
||
|
|
// match!
|
||
|
|
```
|
||
|
|
|
||
|
|
|
||
|
|
API
|
||
|
|
===
|
||
|
|
|
||
|
|
Events
|
||
|
|
------
|
||
|
|
|
||
|
|
* **info**(< _boolean_ >isMatch[, < _Buffer_ >chunk, < _integer_ >start, < _integer_ >end]) - A match _may_ or _may not_ have been made. In either case, a preceding `chunk` of data _may_ be available that did not match the needle. Data (if available) is in `chunk` between `start` (inclusive) and `end` (exclusive).
|
||
|
|
|
||
|
|
|
||
|
|
Properties
|
||
|
|
----------
|
||
|
|
|
||
|
|
* **maxMatches** - < _integer_ > - The maximum number of matches. Defaults to Infinity.
|
||
|
|
|
||
|
|
* **matches** - < _integer_ > - The current match count.
|
||
|
|
|
||
|
|
|
||
|
|
Functions
|
||
|
|
---------
|
||
|
|
|
||
|
|
* **(constructor)**(< _mixed_ >needle) - Creates and returns a new instance for searching for a _Buffer_ or _string_ `needle`.
|
||
|
|
|
||
|
|
* **push**(< _Buffer_ >chunk) - _integer_ - Processes `chunk`. The return value is the last processed index in `chunk` + 1.
|
||
|
|
|
||
|
|
* **reset**() - _(void)_ - Resets internal state. Useful for when you wish to start searching a new/different stream for example.
|