feat(documentation): Add pseudo-class to snapshots with postcss plugin #2092
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,214 @@ | ||
| /** | ||
| * PostCSS plugin to automatically add in companion classes where pseudo-selectors are used. | ||
| * This allows you to add the class name to force the styling of a pseudo-selector, which can be really helpful for testing or being able to concretely reach all style states. | ||
| * @param {array} [options.blacklist] - Define elements to be ignored | ||
| * @param {array} [options.restrictTo] - Create classes for a restricted list of selectors. e.g. [':nth-child', 'hover'] | ||
| * @param {boolean} [options.allCombinations=false] - When enabled output with all combinations of pseudo styles/pseudo classes. | ||
| * @param {boolean} [options.preserveBeforeAfter=true] - When enabled output does not generate pseudo classes for `:before` and `:after`. | ||
| * @param {string} [options.prefix='\\:'] - Define the pseudo-class class prefix. Default: ':' so the class name will be ':hover' for example. | ||
| * @author giuseppeg <https://github.com/giuseppeg> | ||
| * @author philippone <https://github.com/philippone> | ||
| * @author michaeldfoley <https://github.com/michaeldfoley> | ||
| * @see {@link https://github.com/giuseppeg/postcss-pseudo-classes} | ||
| * @returns {{postcssPlugin: string, Once(*): void}} | ||
| */ | ||
| const plugin = (options = {}) => { | ||
| options.preserveBeforeAfter = options?.preserveBeforeAfter || true; | ||
|
|
||
| // Backwards compatibility--we always by default ignored `:root`. | ||
| const blacklist = { | ||
| ':root': true, | ||
| ':host': true, | ||
| ':host-context': true, | ||
| ':not': true, | ||
| ':is': true, | ||
| ':where': true, | ||
| ':has': true, | ||
| ':nth-child': true, | ||
| ':nth-last-child': true, | ||
| ':nth-last-of-type': true, | ||
| ':first-child': true, | ||
| ':last-child': true, | ||
| ':first': true, | ||
| ':last': true, | ||
| ':required': true, | ||
| ':scope': true, | ||
| ':target': true, | ||
| ':valid': true, | ||
| ':user-valid': true, | ||
| ':user-invalid': true, | ||
| ':placeholder-shown': true, | ||
| }; | ||
|
|
||
| const prefix = options?.prefix || '\\:'; | ||
|
|
||
| (options?.blacklist || []).forEach(function (blacklistItem) { | ||
| blacklist[blacklistItem] = true; | ||
| }); | ||
|
|
||
| let restrictTo; | ||
|
|
||
| if (Array.isArray(options.restrictTo) && options.restrictTo.length) { | ||
| restrictTo = options.restrictTo.reduce(function (target, pseudoClass) { | ||
| const finalClass = | ||
| (pseudoClass.charAt(0) === ':' ? '' : ':') + pseudoClass.replace(/\(.*/g, ''); | ||
| if (!Object.hasOwn(target, finalClass)) { | ||
| target[finalClass] = true; | ||
| } | ||
| return target; | ||
| }, {}); | ||
| } | ||
|
|
||
| return { | ||
| postcssPlugin: 'postcss-pseudo-classes', | ||
| Once(css) { | ||
| css.walkRules(function (rule) { | ||
| let combinations; | ||
|
|
||
| rule.selectors.forEach(function (selector) { | ||
| // Ignore some popular things that are never useful | ||
| if (blacklist[selector]) { | ||
| return; | ||
| } | ||
|
|
||
| const selectorParts = selector.split(' '); | ||
| const pseudoedSelectorParts = []; | ||
|
|
||
| selectorParts.forEach(function (selectorPart, index) { | ||
| const pseudos = selectorPart.match(/::?([^:]+)/g); | ||
|
|
||
| if (!pseudos) { | ||
| if (options.allCombinations) { | ||
| pseudoedSelectorParts[index] = [selectorPart]; | ||
| } else { | ||
| pseudoedSelectorParts.push(selectorPart); | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| const baseSelector = selectorPart.substr( | ||
| 0, | ||
| selectorPart.length - pseudos.join('').length, | ||
| ); | ||
|
|
||
| const classPseudos = pseudos.map(function (pseudo) { | ||
| const pseudoToCheck = pseudo.replace(/\(.*/g, ''); | ||
| // restrictTo a subset of pseudo classes | ||
| if ( | ||
| blacklist[pseudoToCheck] || | ||
| pseudoToCheck.split('.').some(item => blacklist[item]) || | ||
| pseudoToCheck.split('#').some(item => blacklist[item]) || | ||
| (restrictTo && !restrictTo[pseudoToCheck]) | ||
| ) { | ||
| return pseudo; | ||
| } | ||
|
|
||
| // Ignore pseudo-elements! | ||
| if (pseudo.match(/^::/)) { | ||
| return pseudo; | ||
| } | ||
|
|
||
| // Ignore ':before' and ':after' | ||
| if (options.preserveBeforeAfter && [':before', ':after'].indexOf(pseudo) !== -1) { | ||
| return pseudo; | ||
| } | ||
|
|
||
| // Kill the colon | ||
| pseudo = pseudo.substr(1); | ||
|
|
||
| // check if pseudo is css function with opening and closing parentheses (.+) | ||
| if (pseudo.match(/\(.+\)/)) { | ||
| // Replace left and right parens | ||
| pseudo = pseudo.replace(/\(/g, '\\('); | ||
|
||
| pseudo = pseudo.replace(/\)/g, '\\)'); | ||
|
||
| } else { | ||
| // Replace left and right parens | ||
| pseudo = pseudo.replace(/\(/g, '('); | ||
|
||
| pseudo = pseudo.replace(/\)/g, ')'); | ||
|
||
| } | ||
|
|
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| return '.' + prefix + pseudo; | ||
| }); | ||
|
|
||
| // Add all combinations of pseudo selectors/pseudo styles given a | ||
| // selector with multiple pseudo styles. | ||
| if (options.allCombinations) { | ||
| combinations = createCombinations(pseudos, classPseudos); | ||
| pseudoedSelectorParts[index] = []; | ||
|
|
||
| combinations.forEach(function (combination) { | ||
| pseudoedSelectorParts[index].push(baseSelector + combination); | ||
| }); | ||
| } else { | ||
| pseudoedSelectorParts.push(baseSelector + classPseudos.join('')); | ||
| } | ||
| }); | ||
|
|
||
| if (options.allCombinations) { | ||
| const serialCombinations = createSerialCombinations( | ||
| pseudoedSelectorParts, | ||
| appendWithSpace, | ||
| ); | ||
|
|
||
| serialCombinations.forEach(function (combination) { | ||
| addSelector(combination); | ||
| }); | ||
| } else { | ||
| addSelector(pseudoedSelectorParts.join(' ')); | ||
| } | ||
|
|
||
| function addSelector(newSelector) { | ||
| if (newSelector && newSelector !== selector) { | ||
| rule.selector += ',\n' + newSelector; | ||
| } | ||
| } | ||
| }); | ||
| }); | ||
| }, | ||
| }; | ||
| }; | ||
|
|
||
| plugin.postcss = true; | ||
|
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| module.exports = plugin; | ||
|
|
||
| // a.length === b.length | ||
| function createCombinations(a, b) { | ||
| let combinations = ['']; | ||
| let newCombinations; | ||
| for (let i = 0, len = a.length; i < len; i += 1) { | ||
| newCombinations = []; | ||
| combinations.forEach(function (combination) { | ||
| newCombinations.push(combination + a[i]); | ||
| // Don't repeat work. | ||
| if (a[i] !== b[i]) { | ||
| newCombinations.push(combination + b[i]); | ||
| } | ||
| }); | ||
| combinations = newCombinations; | ||
| } | ||
| return combinations; | ||
| } | ||
|
|
||
| // arr = [[list of 1st el], [list of 2nd el] ... etc] | ||
| function createSerialCombinations(arr, fn) { | ||
| let combinations = ['']; | ||
| let newCombinations; | ||
| arr.forEach(function (elements) { | ||
| newCombinations = []; | ||
| elements.forEach(function (element) { | ||
| combinations.forEach(function (combination) { | ||
| newCombinations.push(fn(combination, element)); | ||
| }); | ||
| }); | ||
| combinations = newCombinations; | ||
| }); | ||
| return combinations; | ||
| } | ||
|
|
||
| function appendWithSpace(a, b) { | ||
| if (a) { | ||
| a += ' '; | ||
| } | ||
| return a + b; | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| const postcssPseudoClasses = require('./postcss-pseudo-classes.js'); | ||
|
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| module.exports = () => { | ||
| return { | ||
| plugins: [postcssPseudoClasses], | ||
|
There was a problem hiding this comment. I wasn't able to change the Vite config to use this plugin like vitejs/vite#8693 |
||
| }; | ||
| }; | ||
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Ideally, we should publish it as new package perhaps?