c177363a19
🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
96 lines
2.6 KiB
Markdown
96 lines
2.6 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/) -- v10.0.0 or newer
|
|
|
|
|
|
Installation
|
|
============
|
|
|
|
npm install streamsearch
|
|
|
|
Example
|
|
=======
|
|
|
|
```js
|
|
const { inspect } = require('util');
|
|
|
|
const StreamSearch = require('streamsearch');
|
|
|
|
const needle = Buffer.from('\r\n');
|
|
const ss = new StreamSearch(needle, (isMatch, data, start, end) => {
|
|
if (data)
|
|
console.log('data: ' + inspect(data.toString('latin1', start, end)));
|
|
if (isMatch)
|
|
console.log('match!');
|
|
});
|
|
|
|
const chunks = [
|
|
'foo',
|
|
' bar',
|
|
'\r',
|
|
'\n',
|
|
'baz, hello\r',
|
|
'\n world.',
|
|
'\r\n Node.JS rules!!\r\n\r\n',
|
|
];
|
|
for (const chunk of chunks)
|
|
ss.push(Buffer.from(chunk));
|
|
|
|
// output:
|
|
//
|
|
// data: 'foo'
|
|
// data: ' bar'
|
|
// match!
|
|
// data: 'baz, hello'
|
|
// match!
|
|
// data: ' world.'
|
|
// match!
|
|
// data: ' Node.JS rules!!'
|
|
// match!
|
|
// data: ''
|
|
// match!
|
|
```
|
|
|
|
|
|
API
|
|
===
|
|
|
|
Properties
|
|
----------
|
|
|
|
* **maxMatches** - < _integer_ > - The maximum number of matches. Defaults to `Infinity`.
|
|
|
|
* **matches** - < _integer_ > - The current match count.
|
|
|
|
|
|
Functions
|
|
---------
|
|
|
|
* **(constructor)**(< _mixed_ >needle, < _function_ >callback) - Creates and returns a new instance for searching for a _Buffer_ or _string_ `needle`. `callback` is called any time there is non-matching data and/or there is a needle match. `callback` will be called with the following arguments:
|
|
|
|
1. `isMatch` - _boolean_ - Indicates whether a match has been found
|
|
|
|
2. `data` - _mixed_ - If set, this contains data that did not match the needle.
|
|
|
|
3. `start` - _integer_ - The index in `data` where the non-matching data begins (inclusive).
|
|
|
|
4. `end` - _integer_ - The index in `data` where the non-matching data ends (exclusive).
|
|
|
|
5. `isSafeData` - _boolean_ - Indicates if it is safe to store a reference to `data` (e.g. as-is or via `data.slice()`) or not, as in some cases `data` may point to a Buffer whose contents change over time.
|
|
|
|
* **destroy**() - _(void)_ - Emits any last remaining unmatched data that may still be buffered and then resets internal state.
|
|
|
|
* **push**(< _Buffer_ >chunk) - _integer_ - Processes `chunk`, searching for a match. 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.
|
|
|