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