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/*!
* extglob <https://github.com/jonschlinkert/extglob>
*
* Copyright (c) 2015, Jon Schlinkert.
* Licensed under the MIT License.
*/
'use strict';
/**
* Module dependencies
*/
var isExtglob = require('is-extglob');
var re, cache = {};
/**
* Expose `extglob`
*/
module.exports = extglob;
/**
* Convert the given extglob `string` to a regex-compatible
* string.
*
* ```js
* var extglob = require('extglob');
* extglob('!(a?(b))');
* //=> '(?!a(?:b)?)[^/]*?'
* ```
*
* @param {String} `str` The string to convert.
* @param {Object} `options`
* @option {Boolean} [options] `esc` If `false` special characters will not be escaped. Defaults to `true`.
* @option {Boolean} [options] `regex` If `true` a regular expression is returned instead of a string.
* @return {String}
* @api public
*/
function extglob(str, opts) {
opts = opts || {};
var o = {}, i = 0;
// fix common character reversals
// '*!(.js)' => '*.!(js)'
str = str.replace(/!\(([^\w*()])/g, '$1!(');
// support file extension negation
str = str.replace(/([*\/])\.!\([*]\)/g, function (m, ch) {
if (ch === '/') {
return escape('\\/[^.]+');
}
return escape('[^.]+');
});
// create a unique key for caching by
// combining the string and options
var key = str
+ String(!!opts.regex)
+ String(!!opts.contains)
+ String(!!opts.escape);
if (cache.hasOwnProperty(key)) {
return cache[key];
}
if (!(re instanceof RegExp)) {
re = regex();
}
opts.negate = false;
var m;
while (m = re.exec(str)) {
var prefix = m[1];
var inner = m[3];
if (prefix === '!') {
opts.negate = true;
}
var id = '__EXTGLOB_' + (i++) + '__';
// use the prefix of the _last_ (outtermost) pattern
o[id] = wrap(inner, prefix, opts.escape);
str = str.split(m[0]).join(id);
}
var keys = Object.keys(o);
var len = keys.length;
// we have to loop again to allow us to convert
// patterns in reverse order (starting with the
// innermost/last pattern first)
while (len--) {
var prop = keys[len];
str = str.split(prop).join(o[prop]);
}
var result = opts.regex
? toRegex(str, opts.contains, opts.negate)
: str;
result = result.split('.').join('\\.');
// cache the result and return it
return (cache[key] = result);
}
/**
* Convert `string` to a regex string.
*
* @param {String} `str`
* @param {String} `prefix` Character that determines how to wrap the string.
* @param {Boolean} `esc` If `false` special characters will not be escaped. Defaults to `true`.
* @return {String}
*/
function wrap(inner, prefix, esc) {
if (esc) inner = escape(inner);
switch (prefix) {
case '!':
return '(?!' + inner + ')[^/]' + (esc ? '%%%~' : '*?');
case '@':
return '(?:' + inner + ')';
case '+':
return '(?:' + inner + ')+';
case '*':
return '(?:' + inner + ')' + (esc ? '%%' : '*')
case '?':
return '(?:' + inner + '|)';
default:
return inner;
}
}
function escape(str) {
str = str.split('*').join('[^/]%%%~');
str = str.split('.').join('\\.');
return str;
}
/**
* extglob regex.
*/
function regex() {
return /(\\?[@?!+*$]\\?)(\(([^()]*?)\))/;
}
/**
* Negation regex
*/
function negate(str) {
return '(?!^' + str + ').*$';
}
/**
* Create the regex to do the matching. If
* the leading character in the `pattern` is `!`
* a negation regex is returned.
*
* @param {String} `pattern`
* @param {Boolean} `contains` Allow loose matching.
* @param {Boolean} `isNegated` True if the pattern is a negation pattern.
*/
function toRegex(pattern, contains, isNegated) {
var prefix = contains ? '^' : '';
var after = contains ? '$' : '';
pattern = ('(?:' + pattern + ')' + after);
if (isNegated) {
pattern = prefix + negate(pattern);
}
return new RegExp(prefix + pattern);
}
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