94 lines
2 KiB
JavaScript
94 lines
2 KiB
JavaScript
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let { list } = require('postcss')
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/**
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* Throw special error, to tell beniary,
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* that this error is from Autoprefixer.
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*/
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module.exports.error = function (text) {
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let err = new Error(text)
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err.autoprefixer = true
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throw err
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}
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/**
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* Return array, that doesn’t contain duplicates.
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*/
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module.exports.uniq = function (array) {
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return [...new Set(array)]
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}
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/**
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* Return "-webkit-" on "-webkit- old"
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*/
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module.exports.removeNote = function (string) {
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if (!string.includes(' ')) {
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return string
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}
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return string.split(' ')[0]
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}
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/**
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* Escape RegExp symbols
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*/
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module.exports.escapeRegexp = function (string) {
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return string.replace(/[$()*+-.?[\\\]^{|}]/g, '\\$&')
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}
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/**
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* Return regexp to check, that CSS string contain word
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*/
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module.exports.regexp = function (word, escape = true) {
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if (escape) {
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word = this.escapeRegexp(word)
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}
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return new RegExp(`(^|[\\s,(])(${word}($|[\\s(,]))`, 'gi')
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}
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/**
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* Change comma list
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*/
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module.exports.editList = function (value, callback) {
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let origin = list.comma(value)
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let changed = callback(origin, [])
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if (origin === changed) {
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return value
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}
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let join = value.match(/,\s*/)
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join = join ? join[0] : ', '
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return changed.join(join)
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}
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/**
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* Split the selector into parts.
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* It returns 3 level deep array because selectors can be comma
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* separated (1), space separated (2), and combined (3)
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* @param {String} selector selector string
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* @return {Array<Array<Array>>} 3 level deep array of split selector
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* @see utils.test.js for examples
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*/
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module.exports.splitSelector = function (selector) {
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return list.comma(selector).map(i => {
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return list.space(i).map(k => {
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return k.split(/(?=\.|#)/g)
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})
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})
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}
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/**
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* Return true if a given value only contains numbers.
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* @param {*} value
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* @returns {boolean}
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*/
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module.exports.isPureNumber = function (value) {
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if (typeof value === 'number') {
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return true
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}
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if (typeof value === 'string') {
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return /^[0-9]+$/.test(value)
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}
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return false
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}
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