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* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var replace = require( '@stdlib/string/replace' );
var FS_ALIASES = require( './fs_aliases.js' );
// MAIN //
/**
* Returns a regular expression for matching file system APIs.
*
* ## Notes
*
* - Example output:
*
* ```text
* /\b(?:(exists|exists\.sync|readFile|readFile\.sync|readJSON|readJSON\.sync|readWASM|readWASM\.sync)\s*\(\s*(.*,\s*)*(?:\[\s*(?:[^\]]*,\s*)*)?['"]([^'"]*))$/
* ```
*
* @private
* @returns {RegExp} regular expression
*/
function createRegExp() {
var re;
var N;
var M;
var i;
N = FS_ALIASES.length;
M = N - 1;
re = '';
// Match a word boundary:
re += '\\b';
// Create a capture group for detecting a file system alias with an incomplete invocation (e.g., `readFile.sync( './foo/bar`):
re += '(?:';
// Create a capture group for matching the file system alias...
re += '(';
for ( i = 0; i < N; i++ ) {
// Append the alias, making sure to escape periods (e.g., `readFile.sync` => `readFile\.sync`):
re += replace( FS_ALIASES[i][0], '.', '\\.' );
// Separate aliases with an OR separator:
if ( i < M ) {
re += '|';
}
}
// Close the file system alias capture group:
re += ')';
// Match zero or more whitespace characters after the alias:
re += '\\s*';
// Match an opening parenthesis literal:
re += '\\(';
// Match zero or more whitespace characters after the opening parenthesis:
re += '\\s*';
// Capture provided (comma-separated) arguments which precede the last argument:
re += '(.*,\\s*)*';
// Capture, but don't remember, an incomplete array argument (including all items except for the last) which occurs zero or one time:
re += '(?:\\[\\s*(?:[^\\]]*,\\s*)*)?';
// Match either a `'` or `"` literal:
re += '[\'"]';
// Capture the last (incomplete) path argument (or array item):
re += '([^\'"]*)';
// Close the incomplete invocation capture group:
re += ')';
// Match the end of input (i.e., ensure that the match is an incomplete invocation):
re += '$';
// Return the regular expression:
return new RegExp( re );
}
// EXPORTS //
module.exports = createRegExp;
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