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90 lines
2.2 KiB
Markdown
90 lines
2.2 KiB
Markdown
6 years ago
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# preserve [](http://badge.fury.io/js/preserve)
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> Temporarily substitute tokens in the given `string` with placeholders, then put them back after transforming the string.
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Useful for protecting tokens, like templates in HTML, from being mutated when the string is transformed in some way, like from a formatter/beautifier.
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**Example without `preserve`**
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Let's say you want to use [js-beautify] on a string of html with Lo-Dash/Underscore templates, such as: `<ul><li><%= name %></li></ul>`:
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js-beautify will render the template unusable (and apply incorrect formatting because of the unfamiliar syntax from the Lo-Dash template):
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```html
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<ul>
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<li>
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<%=n ame %>
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</li>
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</ul>
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```
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**Example with `preserve`**
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Correct.
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```html
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<ul>
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<li><%= name %></li>
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</ul>
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```
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For the record, this is just a random example, I've had very few issues with js-beautify in general. But with or without js-beautify, this kind of token mangling does happen sometimes when you use formatters, beautifiers or similar tools.
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## Install
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## Install with [npm](npmjs.org)
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```bash
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npm i preserve --save
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```
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## Run tests
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```bash
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npm test
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```
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## API
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### [.before](index.js#L23)
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Replace tokens in `str` with a temporary, heuristic placeholder.
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* `str` **{String}**
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* `returns` **{String}**: String with placeholders.
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```js
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tokens.before('{a\\,b}');
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//=> '{__ID1__}'
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```
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### [.after](index.js#L44)
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Replace placeholders in `str` with original tokens.
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* `str` **{String}**: String with placeholders
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* `returns` **{String}** `str`: String with original tokens.
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```js
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tokens.after('{__ID1__}');
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//=> '{a\\,b}'
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```
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## Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/preserve/issues)
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## Author
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**Jon Schlinkert**
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+ [github/jonschlinkert](https://github.com/jonschlinkert)
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+ [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
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## License
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Copyright (c) 2015-2015, Jon Schlinkert.
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Released under the MIT license
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***
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_This file was generated by [verb](https://github.com/assemble/verb) on January 10, 2015._
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[js-beautify]: https://github.com/beautify-web/js-beautify
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