108 lines
2.3 KiB
JavaScript
108 lines
2.3 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var reExtnamePosix = require( './main.js' );
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// MAIN //
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/**
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* Captures a POSIX filename extension. Modified from Node.js [source][1].
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*
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* Regular expression: `/^(?:\/?|)(?:[\s\S]*?)(?:(?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/`
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*
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* - `\^`
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* - match any string which begins with
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*
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* - `(?:)`
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* - capture but do not remember (root)
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*
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* - `\/?`
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* - match a `/` literal zero or one time
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*
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* - `|)`
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* - OR capture nothing
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*
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* - `(?:)`
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* - capture but do not remember (directory)
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*
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* - `[\s\S]`
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* - any space or non-space character
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*
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* - `*?`
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* - zero or more times, but non-greedily (shortest possible match)
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*
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* - `(?:)`
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* - capture but do not remember (basename)
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*
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* - `\.{1,2}`
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* - match a `.` literal one or two times
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*
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* - `|`
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* - OR
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*
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* - `[^\/]+?`
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* - match anything which is not a `/` literal one or more times, but do so non-greedily
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*
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* - `|)`
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* - OR capture nothing
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*
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* - `()`
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* - capture
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*
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* - `\.`
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* - match a `.` literal
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*
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* - `[^.\/]`
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* - match anything which is not a `.` or `/` literal
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*
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* - `*`
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* - zero or more times
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*
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* - `|)`
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* - OR capture nothing
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*
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* - `(?:)`
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* - capture but do not remember (trailing slash)
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*
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* - `[\/]`
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* - match a `/` literal
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*
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* - `*`
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* - zero or more times
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*
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* - `$`
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* - end of string
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*
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* [1]: https://github.com/nodejs/node/blob/1a3b295d0f46b2189bd853800b1e63ab4d106b66/lib/path.js#L406
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*
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* @constant
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* @type {RegExp}
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* @default /^(?:\/?|)(?:[\s\S]*?)(?:(?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/
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*/
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var RE_EXTNAME_POSIX = reExtnamePosix();
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// EXPORTS //
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module.exports = RE_EXTNAME_POSIX;
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