92 lines
3.2 KiB
Markdown
92 lines
3.2 KiB
Markdown
|
# balanced-match
|
||
|
|
|
||
|
|
Match balanced string pairs, like `{` and `}` or `<b>` and `</b>`. Supports regular expressions as well!
|
||
|
|
|
||
|
|
[](http://travis-ci.org/juliangruber/balanced-match)
|
||
|
|
[](https://www.npmjs.org/package/balanced-match)
|
||
|
|
|
||
|
|
[](https://ci.testling.com/juliangruber/balanced-match)
|
||
|
|
|
||
|
|
## Example
|
||
|
|
|
||
|
|
Get the first matching pair of braces:
|
||
|
|
|
||
|
|
```js
|
||
|
|
var balanced = require('balanced-match');
|
||
|
|
|
||
|
|
console.log(balanced('{', '}', 'pre{in{nested}}post'));
|
||
|
|
console.log(balanced('{', '}', 'pre{first}between{second}post'));
|
||
|
|
console.log(balanced(/\s+\{\s+/, /\s+\}\s+/, 'pre { in{nest} } post'));
|
||
|
|
```
|
||
|
|
|
||
|
|
The matches are:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
$ node example.js
|
||
|
|
{ start: 3, end: 14, pre: 'pre', body: 'in{nested}', post: 'post' }
|
||
|
|
{ start: 3,
|
||
|
|
end: 9,
|
||
|
|
pre: 'pre',
|
||
|
|
body: 'first',
|
||
|
|
post: 'between{second}post' }
|
||
|
|
{ start: 3, end: 17, pre: 'pre', body: 'in{nest}', post: 'post' }
|
||
|
|
```
|
||
|
|
|
||
|
|
## API
|
||
|
|
|
||
|
|
### var m = balanced(a, b, str)
|
||
|
|
|
||
|
|
For the first non-nested matching pair of `a` and `b` in `str`, return an
|
||
|
|
object with those keys:
|
||
|
|
|
||
|
|
* **start** the index of the first match of `a`
|
||
|
|
* **end** the index of the matching `b`
|
||
|
|
* **pre** the preamble, `a` and `b` not included
|
||
|
|
* **body** the match, `a` and `b` not included
|
||
|
|
* **post** the postscript, `a` and `b` not included
|
||
|
|
|
||
|
|
If there's no match, `undefined` will be returned.
|
||
|
|
|
||
|
|
If the `str` contains more `a` than `b` / there are unmatched pairs, the first match that was closed will be used. For example, `{{a}` will match `['{', 'a', '']` and `{a}}` will match `['', 'a', '}']`.
|
||
|
|
|
||
|
|
### var r = balanced.range(a, b, str)
|
||
|
|
|
||
|
|
For the first non-nested matching pair of `a` and `b` in `str`, return an
|
||
|
|
array with indexes: `[ <a index>, <b index> ]`.
|
||
|
|
|
||
|
|
If there's no match, `undefined` will be returned.
|
||
|
|
|
||
|
|
If the `str` contains more `a` than `b` / there are unmatched pairs, the first match that was closed will be used. For example, `{{a}` will match `[ 1, 3 ]` and `{a}}` will match `[0, 2]`.
|
||
|
|
|
||
|
|
## Installation
|
||
|
|
|
||
|
|
With [npm](https://npmjs.org) do:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
npm install balanced-match
|
||
|
|
```
|
||
|
|
|
||
|
|
## License
|
||
|
|
|
||
|
|
(MIT)
|
||
|
|
|
||
|
|
Copyright (c) 2013 Julian Gruber <julian@juliangruber.com>
|
||
|
|
|
||
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||
|
|
this software and associated documentation files (the "Software"), to deal in
|
||
|
|
the Software without restriction, including without limitation the rights to
|
||
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
||
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
||
|
|
so, subject to the following conditions:
|
||
|
|
|
||
|
|
The above copyright notice and this permission notice shall be included in all
|
||
|
|
copies or substantial portions of the Software.
|
||
|
|
|
||
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
SOFTWARE.
|