forked from M3-Academy/challenge-algorithms-v2.0
65 lines
1.8 KiB
JavaScript
65 lines
1.8 KiB
JavaScript
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'use strict';
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const path = require('path');
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const win32 = process.platform === 'win32';
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const {
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REGEX_BACKSLASH,
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REGEX_REMOVE_BACKSLASH,
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REGEX_SPECIAL_CHARS,
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REGEX_SPECIAL_CHARS_GLOBAL
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} = require('./constants');
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exports.isObject = val => val !== null && typeof val === 'object' && !Array.isArray(val);
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exports.hasRegexChars = str => REGEX_SPECIAL_CHARS.test(str);
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exports.isRegexChar = str => str.length === 1 && exports.hasRegexChars(str);
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exports.escapeRegex = str => str.replace(REGEX_SPECIAL_CHARS_GLOBAL, '\\$1');
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exports.toPosixSlashes = str => str.replace(REGEX_BACKSLASH, '/');
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exports.removeBackslashes = str => {
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return str.replace(REGEX_REMOVE_BACKSLASH, match => {
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return match === '\\' ? '' : match;
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});
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};
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exports.supportsLookbehinds = () => {
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const segs = process.version.slice(1).split('.').map(Number);
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if (segs.length === 3 && segs[0] >= 9 || (segs[0] === 8 && segs[1] >= 10)) {
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return true;
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}
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return false;
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};
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exports.isWindows = options => {
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if (options && typeof options.windows === 'boolean') {
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return options.windows;
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}
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return win32 === true || path.sep === '\\';
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};
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exports.escapeLast = (input, char, lastIdx) => {
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const idx = input.lastIndexOf(char, lastIdx);
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if (idx === -1) return input;
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if (input[idx - 1] === '\\') return exports.escapeLast(input, char, idx - 1);
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return `${input.slice(0, idx)}\\${input.slice(idx)}`;
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};
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exports.removePrefix = (input, state = {}) => {
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let output = input;
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if (output.startsWith('./')) {
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output = output.slice(2);
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state.prefix = './';
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}
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return output;
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};
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exports.wrapOutput = (input, state = {}, options = {}) => {
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const prepend = options.contains ? '' : '^';
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const append = options.contains ? '' : '$';
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let output = `${prepend}(?:${input})${append}`;
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if (state.negated === true) {
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output = `(?:^(?!${output}).*$)`;
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}
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return output;
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};
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