Bernt
05ed037fe8
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58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
# balanced-match
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Match balanced string pairs, like `{` and `}` or `<b>` and
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`</b>`. Supports regular expressions as well!
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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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import { balanced } from '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(
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balanced(/\s+\{\s+/, /\s+\}\s+/, 'pre { in{nest} } post'),
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)
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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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### const 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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### const 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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