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'use strict';
/**
* Local dependencies
*/
var compilers = require('./lib/compilers');
var parsers = require('./lib/parsers');
/**
* Module dependencies
*/
var debug = require('debug')('expand-brackets');
var extend = require('extend-shallow');
var Snapdragon = require('snapdragon');
var toRegex = require('to-regex');
/**
* Parses the given POSIX character class `pattern` and returns a
* string that can be used for creating regular expressions for matching.
*
* @param {String} `pattern`
* @param {Object} `options`
* @return {Object}
* @api public
*/
function brackets(pattern, options) {
debug('initializing from <%s>', __filename);
var res = brackets.create(pattern, options);
return res.output;
}
/**
* Takes an array of strings and a POSIX character class pattern, and returns a new
* array with only the strings that matched the pattern.
*
* ```js
* var brackets = require('expand-brackets');
* console.log(brackets.match(['1', 'a', 'ab'], '[[:alpha:]]'));
* //=> ['a']
*
* console.log(brackets.match(['1', 'a', 'ab'], '[[:alpha:]]+'));
* //=> ['a', 'ab']
* ```
* @param {Array} `arr` Array of strings to match
* @param {String} `pattern` POSIX character class pattern(s)
* @param {Object} `options`
* @return {Array}
* @api public
*/
brackets.match = function(arr, pattern, options) {
arr = [].concat(arr);
var opts = extend({}, options);
var isMatch = brackets.matcher(pattern, opts);
var len = arr.length;
var idx = -1;
var res = [];
while (++idx < len) {
var ele = arr[idx];
if (isMatch(ele)) {
res.push(ele);
}
}
if (res.length === 0) {
if (opts.failglob === true) {
throw new Error('no matches found for "' + pattern + '"');
}
if (opts.nonull === true || opts.nullglob === true) {
return [pattern.split('\\').join('')];
}
}
return res;
};
/**
* Returns true if the specified `string` matches the given
* brackets `pattern`.
*
* ```js
* var brackets = require('expand-brackets');
*
* console.log(brackets.isMatch('a.a', '[[:alpha:]].[[:alpha:]]'));
* //=> true
* console.log(brackets.isMatch('1.2', '[[:alpha:]].[[:alpha:]]'));
* //=> false
* ```
* @param {String} `string` String to match
* @param {String} `pattern` Poxis pattern
* @param {String} `options`
* @return {Boolean}
* @api public
*/
brackets.isMatch = function(str, pattern, options) {
return brackets.matcher(pattern, options)(str);
};
/**
* Takes a POSIX character class pattern and returns a matcher function. The returned
* function takes the string to match as its only argument.
*
* ```js
* var brackets = require('expand-brackets');
* var isMatch = brackets.matcher('[[:lower:]].[[:upper:]]');
*
* console.log(isMatch('a.a'));
* //=> false
* console.log(isMatch('a.A'));
* //=> true
* ```
* @param {String} `pattern` Poxis pattern
* @param {String} `options`
* @return {Boolean}
* @api public
*/
brackets.matcher = function(pattern, options) {
var re = brackets.makeRe(pattern, options);
return function(str) {
return re.test(str);
};
};
/**
* Create a regular expression from the given `pattern`.
*
* ```js
* var brackets = require('expand-brackets');
* var re = brackets.makeRe('[[:alpha:]]');
* console.log(re);
* //=> /^(?:[a-zA-Z])$/
* ```
* @param {String} `pattern` The pattern to convert to regex.
* @param {Object} `options`
* @return {RegExp}
* @api public
*/
brackets.makeRe = function(pattern, options) {
var res = brackets.create(pattern, options);
var opts = extend({strictErrors: false}, options);
return toRegex(res.output, opts);
};
/**
* Parses the given POSIX character class `pattern` and returns an object
* with the compiled `output` and optional source `map`.
*
* ```js
* 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: [] }
* ```
* @param {String} `pattern`
* @param {Object} `options`
* @return {Object}
* @api public
*/
brackets.create = function(pattern, options) {
var snapdragon = (options && options.snapdragon) || new Snapdragon(options);
compilers(snapdragon);
parsers(snapdragon);
var ast = snapdragon.parse(pattern, options);
ast.input = pattern;
var res = snapdragon.compile(ast, options);
res.input = pattern;
return res;
};
/**
* Expose `brackets` constructor, parsers and compilers
*/
brackets.compilers = compilers;
brackets.parsers = parsers;
/**
* Expose `brackets`
* @type {Function}
*/
module.exports = brackets;
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