braces

braces

Fastest brace expansion for node.js, with more complete support of Bash 4.3 than minimatch.

• Expands comma-separated values: a/{b,c}/d => ['a/b/d', 'a/c/d']
• Expands alphabetical or numerical ranges: {1..3} => ['1', '2', '3']
• Better Bash 4.3 coverage than minimatch, braces passes most of the unit tests from the Bash 4.3 specification, with a few intentional differences.
• Braces is faster than minimatch in every benchmark, and its 10x faster than minimatch in the most common usage scenarios.
• Special characters can be used to generate interesting patterns.

Install with npm

npm i braces --save

Example usage

var braces = require('braces');

braces('a/{x,y}/c{d}e')
//=> ['a/x/cde', 'a/y/cde']

braces('a/b/c/{x,y}')
//=> ['a/b/c/x', 'a/b/c/y']

braces('a/{x,{1..5},y}/c{d}e')
//=> ['a/x/cde', 'a/1/cde', 'a/y/cde', 'a/2/cde', 'a/3/cde', 'a/4/cde', 'a/5/cde']

Pro tip!

Use braces to generate test fixtures!

Example

var braces = require('./');
var path = require('path');
var fs = require('fs');

braces('blah/{a..z}.js').forEach(function(fp) {
  if (!fs.existsSync(path.dirname(fp))) {
    fs.mkdirSync(path.dirname(fp));
  }
  fs.writeFileSync(fp, '');
});

See the tests for more examples and use cases (also see the bash spec tests);

Range expansion

Uses expand-range for range expansion.

braces('a{1..3}b')
//=> ['a1b', 'a2b', 'a3b']

braces('a{5..8}b')
//=> ['a5b', 'a6b', 'a7b', 'a8b']

braces('a{00..05}b')
//=> ['a00b', 'a01b', 'a02b', 'a03b', 'a04b', 'a05b']

braces('a{01..03}b')
//=> ['a01b', 'a02b', 'a03b']

braces('a{000..005}b')
//=> ['a000b', 'a001b', 'a002b', 'a003b', 'a004b', 'a005b']

braces('a{a..e}b')
//=> ['aab', 'abb', 'acb', 'adb', 'aeb']

braces('a{A..E}b')
//=> ['aAb', 'aBb', 'aCb', 'aDb', 'aEb']

Pass a function as the last argument to customize range expansions:

var range = braces('x{a..e}y', function (str, i) {
  return String.fromCharCode(str) + i;
});

console.log(range);
//=> ['xa0y', 'xb1y', 'xc2y', 'xd3y', 'xe4y']

See expand-range for benchmarks, tests and the full list of range expansion features.

Bash 4.3

Better support for Bash 4.3 than minimatch

This project has comprehensive unit tests, including tests coverted from Bash 4.3. Currently only 8 of 102 unit tests fail, and

Differences

Main differences from Bash:

• In bash (and minimatch) the braces are retained when only one set exists. ex: a{b}c => ['a{b}c']. Since this can cause problems with routes and config templates etc., single-set valid braces are removed. e.g a{b}c => ['abc']
• duplicates are removed by default. To keep dupes, pass nodupes: false on the options

New features:

• Support for (ignoring) es6 delimiters. ex: a/${b}/{c,d} => ['a/${b}/c', 'a/${b}/d']

Benchmarks

#1: escape.js
  brace-expansion.js x 114,934 ops/sec ±1.24% (93 runs sampled)
  braces.js x 342,254 ops/sec ±0.84% (90 runs sampled)

#2: exponent.js
  brace-expansion.js x 12,359 ops/sec ±0.86% (96 runs sampled)
  braces.js x 20,389 ops/sec ±0.71% (97 runs sampled)

#3: multiple.js
  brace-expansion.js x 114,469 ops/sec ±1.44% (94 runs sampled)
  braces.js x 401,621 ops/sec ±0.87% (91 runs sampled)

#4: nested.js
  brace-expansion.js x 102,769 ops/sec ±1.55% (92 runs sampled)
  braces.js x 314,088 ops/sec ±0.71% (98 runs sampled)

#5: normal.js
  brace-expansion.js x 157,577 ops/sec ±1.65% (91 runs sampled)
  braces.js x 1,115,950 ops/sec ±0.74% (94 runs sampled)

#6: range.js
  brace-expansion.js x 138,822 ops/sec ±1.71% (91 runs sampled)
  braces.js x 1,108,353 ops/sec ±0.85% (94 runs sampled)

Run the benchmarks:

node benchmark

Run tests

Install dev dependencies:

npm i -d && npm test

Related

• micromatch: wildcard/glob matcher for javascript. a faster alternative to minimatch.
• fill-range: Fill in a range of numbers or letters, optionally passing an increment or multiplier to use
• [expand-range]: Wraps fill-range for fast, bash-like range expansion in strings. Expand a range of numbers or letters, uppercase or lowercase

Contributing

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

Please run benchmarks before and after any code changes to what the impact of the code changes are before submitting a PR.

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright (c) 2014-2015 Jon Schlinkert
Released under the MIT license

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This file was generated by verb on January 28, 2015.