expand-brackets

expand-brackets

Expand POSIX bracket expressions (character classes) in glob patterns.

Install

Install with npm:

$ npm install --save expand-brackets

Usage

var brackets = require('expand-brackets');
brackets(string[, options]);

Params

The main export is a function that takes the following parameters:

• pattern {String}: the pattern to convert
• options {Object}: optionally supply an options object
• returns {String}: returns a string that can be used to create a regex

Example

console.log(brackets('[![:lower:]]'));
//=> '[^a-z]'

API

brackets

Parses the given POSIX character class pattern and returns an object with the compiled output and optional source map.

Params

• pattern {String}
• options {Object}
• returns {Object}

Example

var brackets = require('expand-brackets');
console.log(brackets('[[:alpha:]]'));
// { options: { source: 'string' },
//   input: '[[:alpha:]]',
//   state: {},
//   compilers:
//    { eos: [Function],
//      noop: [Function],
//      bos: [Function],
//      not: [Function],
//      escape: [Function],
//      text: [Function],
//      posix: [Function],
//      bracket: [Function],
//      'bracket.open': [Function],
//      'bracket.inner': [Function],
//      'bracket.literal': [Function],
//      'bracket.close': [Function] },
//   output: '[a-zA-Z]',
//   ast:
//    { type: 'root',
//      errors: [],
//      nodes: [ [Object], [Object], [Object] ] },
//   parsingErrors: [] }

.match

Takes an array of strings and a POSIX character class pattern, and returns a new array with only the strings that matched the pattern.

Params

• arr {Array}: Array of strings to match
• pattern {String}: POSIX character class pattern(s)
• options {Object}
• returns {Array}

Example

var brackets = require('expand-brackets');
console.log(brackets.match(['1', 'a', 'ab'], '[[:alpha:]]'));
//=> ['a']

console.log(brackets.match(['1', 'a', 'ab'], '[[:alpha:]]+'));
//=> ['a', 'ab']

.isMatch

Returns true if the specified string matches the given brackets pattern.

Params

• string {String}: String to match
• pattern {String}: Poxis pattern
• options {String}
• returns {Boolean}

Example

var brackets = require('expand-brackets');

console.log(brackets.isMatch('a.a', '[[:alpha:]].[[:alpha:]]'));
//=> true
console.log(brackets.isMatch('1.2', '[[:alpha:]].[[:alpha:]]'));
//=> false

.matcher

Takes a POSIX character class pattern and returns a matcher function. The returned function takes the string to match as its only argument.

Params

• pattern {String}: Poxis pattern
• options {String}
• returns {Boolean}

Example

var brackets = require('expand-brackets');
var isMatch = brackets.matcher('[[:lower:]].[[:upper:]]');

console.log(isMatch('a.a'));
//=> false
console.log(isMatch('a.A'));
//=> true

.makeRe

Create a regular expression from the given pattern.

Params

• pattern {String}: The pattern to convert to regex.
• options {Object}
• returns {RegExp}

Example

var brackets = require('expand-brackets');
var re = brackets.makeRe('[[:alpha:]]');
console.log(re);
//=> /^(?:[a-zA-Z])$/

Options

options.sourcemap

Generate a source map for the given pattern.

Example

var res = brackets('[:alpha:]', {sourcemap: true});

console.log(res.map);
// { version: 3,
//   sources: [ 'brackets' ],
//   names: [],
//   mappings: 'AAAA,MAAS',
//   sourcesContent: [ '[:alpha:]' ] }

POSIX Character classes

The following named POSIX bracket expressions are supported:

• [:alnum:]: Alphanumeric characters (a-zA-Z0-9])
• [:alpha:]: Alphabetic characters (a-zA-Z])
• [:blank:]: Space and tab ([ t])
• [:digit:]: Digits ([0-9])
• [:lower:]: Lowercase letters ([a-z])
• [:punct:]: Punctuation and symbols. ([!"#$%&'()*+, -./:;<=>?@ [\]^_``{|}~])
• [:upper:]: Uppercase letters ([A-Z])
• [:word:]: Word characters (letters, numbers and underscores) ([A-Za-z0-9_])
• [:xdigit:]: Hexadecimal digits ([A-Fa-f0-9])

See posix-character-classes for more details.

Not supported

• equivalence classes are not supported
• POSIX.2 collating symbols are not supported

Changelog

v0.2.0

In addition to performance and matching improvements, the v0.2.0 refactor adds complete POSIX character class support, with the exception of equivalence classes and POSIX.2 collating symbols which are not relevant to node.js usage.

Added features

• parser is exposed, so that expand-brackets parsers can be used by upstream parsers (like micromatch)
• compiler is exposed, so that expand-brackets compilers can be used by upstream compilers
• source maps

source map example

var brackets = require('expand-brackets');
var res = brackets('[:alpha:]');
console.log(res.map);

{ version: 3,
     sources: [ 'brackets' ],
     names: [],
     mappings: 'AAAA,MAAS',
     sourcesContent: [ '[:alpha:]' ] }

About

Related projects

• braces: Fastest brace expansion for node.js, with the most complete support for the Bash 4.3 braces… more | homepage
• extglob: Convert extended globs to regex-compatible strings. Add (almost) the expressive power of regular expressions to… more | homepage
• micromatch: Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch. | homepage
• nanomatch: Fast, minimal glob matcher for node.js. | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Contributors

Commits	Contributor
17	jonschlinkert
2	MartinKolarik
2	es128
1	eush77

Building docs

(This document was generated by verb-generate-readme (a verb generator), please don't edit the readme directly. Any changes to the readme must be made in .verb.md.)

To generate the readme and API documentation with verb:

$ npm install -g verb verb-generate-readme && verb

Running tests

Install dev dependencies:

$ npm install -d && npm test

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2016, Jon Schlinkert. Released under the MIT license.

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This file was generated by verb-generate-readme, v0.1.31, on September 27, 2016.