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Copy pathplugin.js
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Copy pathplugin.js
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176 lines (157 loc) · 5.5 KB
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const selectorParser = require('postcss-selector-parser');
const DEFAULT_OPTIONS = {
addNoJs: true,
check: decl =>
/\.(jpe?g|png)(?!(\.webp|.*[&?]format=webp))/i.test(decl.value),
modules: false,
noJsClass: 'no-js',
noWebpClass: 'no-webp',
rename: oldName => oldName.replace(/\.(jpe?g|png)/gi, '.webp'),
webpClass: 'webp'
}
module.exports = (opts = {}) => {
let { addNoJs, check, modules, noJsClass, noWebpClass, rename, webpClass } = {
...DEFAULT_OPTIONS,
...opts
}
function removeHtmlPrefix(className) {
return className.replace(/html ?\./, '')
}
/**
* Process background value to remove unnecessary parts
* @param {string} value - background value
*/
function processBackgroundValue(value) {
// check for image-set
// https://developer.mozilla.org/en-US/docs/Web/CSS/image/image-set
let clearValue =
value.includes('image-set') ?
/(image-set.*\))/gm.exec(value) :
/(url.*\))/gm.exec(value)
if (!clearValue) {
return value;
}
return clearValue[0] ?? value;
}
/**
* Add .webp and .no-webp classes
* @param {Rule} rule - PostCSS Rule
* @param {string} className - class name to add
*/
function addClass(rule, className) {
let initialClassName = className
let internalNoWebpClass = noWebpClass.includes('html') ? removeHtmlPrefix(noWebpClass) : noWebpClass
if (className.includes('html')) {
className = removeHtmlPrefix(className)
}
/**
* @param {parser.Container} selectors
* @param {string} targetClassName
*/
let transformWithClass = (selectors, targetClassName) => {
selectors.each(selector => {
let isBodyFound = false
let isHtmlFound = false
// detect body & html, add class to body
selector.walkTags(currentSelector => {
if (currentSelector.value === 'body') {
isBodyFound = true
currentSelector.parent.insertAfter(currentSelector, selectorParser.className({value: targetClassName}))
}
else if (currentSelector.value === 'html') {
isHtmlFound = true
}
})
let bodyCombinator = selectorParser.combinator({value: ' '})
let bodyTag = selectorParser.tag({value: 'body'})
let bodyClass = selectorParser.className({value: targetClassName})
// html found, no body tags
if (isHtmlFound && !isBodyFound) {
let isHtmlFoundHere = false
selector.walk(currentSelector => {
if (currentSelector.value === 'html') {
isHtmlFoundHere = true
}
else if (isHtmlFoundHere && currentSelector.type === 'combinator') {
let selectorParent = currentSelector.parent
selectorParent.insertAfter(currentSelector, bodyTag)
selectorParent.insertAfter(bodyTag, bodyClass)
selectorParent.insertAfter(bodyClass, bodyCombinator)
}
})
}
else if (!isHtmlFound && !isBodyFound) {
if (selector.first.spaces.before === ' ') {
bodyTag.spaces.before = ' '
}
selector.first.spaces.before = ' '
selector.prepend(bodyClass)
selector.prepend(bodyTag)
}
})
if (addNoJs && initialClassName === noWebpClass) {
selectors.each(selector => {
let selectorClone = selector.clone()
selectorClone.walk(subSelector => {
if (subSelector.type === 'class' && subSelector.value === internalNoWebpClass) {
subSelector.value = noJsClass
}
})
selectorClone.first.spaces.before = ' '
selectors.insertAfter(selector, selectorClone)
})
}
if (modules) {
let validClass = [webpClass, internalNoWebpClass, noJsClass]
selectors.each(selector => {
selector.walk((subSelector) => {
if (subSelector.type === 'class' && validClass.includes(subSelector.value)) {
let newPseudo = selectorParser.pseudo({value: ':global(.' + subSelector.value + ')'})
subSelector.replaceWith(newPseudo)
}
})
})
}
}
let transform = selectors => {
transformWithClass(selectors, className)
}
return selectorParser(transform).processSync(rule.selector)
}
return {
Declaration(decl) {
if (check(decl)) {
let rule = decl.parent
if (rule.selector.includes(`.${removeHtmlPrefix(noWebpClass)}`)) return
// check for image-set with types & skip processing
if (decl.value.includes('image-set') && decl.value.includes(') type(')) return
let webp = rule.cloneAfter()
webp.each(i => {
if (i.prop !== decl.prop && i.value !== decl.value) i.remove()
})
webp.selector = addClass(webp, webpClass)
webp.each(i => {
if (
rename &&
Object.prototype.toString.call(rename) === '[object Function]'
) {
i.value = rename(i.value)
i.prop = 'background-image'
}
i.value = processBackgroundValue(i.value)
})
let noWebp = rule.cloneAfter()
noWebp.each(i => {
if (i.prop !== decl.prop && i.value !== decl.value) i.remove()
})
noWebp.selector = addClass(noWebp, noWebpClass)
noWebp.each(i => {
i.value = processBackgroundValue(i.value)
i.prop = 'background-image'
})
}
},
postcssPlugin: 'webp-in-css/plugin'
}
}
module.exports.postcss = true