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utils.js
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Sun, Aug 3, 03:11

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

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