330 lines
8.0 KiB
JavaScript
Executable File
330 lines
8.0 KiB
JavaScript
Executable File
let { list } = require('postcss')
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let parser = require('postcss-value-parser')
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let Browsers = require('./browsers')
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let vendor = require('./vendor')
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class Transition {
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constructor(prefixes) {
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this.props = ['transition', 'transition-property']
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this.prefixes = prefixes
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}
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/**
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* Process transition and add prefixes for all necessary properties
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*/
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add(decl, result) {
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let prefix, prop
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let add = this.prefixes.add[decl.prop]
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let vendorPrefixes = this.ruleVendorPrefixes(decl)
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let declPrefixes = vendorPrefixes || (add && add.prefixes) || []
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let params = this.parse(decl.value)
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let names = params.map(i => this.findProp(i))
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let added = []
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if (names.some(i => i[0] === '-')) {
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return
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}
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for (let param of params) {
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prop = this.findProp(param)
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if (prop[0] === '-') continue
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let prefixer = this.prefixes.add[prop]
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if (!prefixer || !prefixer.prefixes) continue
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for (prefix of prefixer.prefixes) {
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if (vendorPrefixes && !vendorPrefixes.some(p => prefix.includes(p))) {
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continue
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}
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let prefixed = this.prefixes.prefixed(prop, prefix)
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if (prefixed !== '-ms-transform' && !names.includes(prefixed)) {
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if (!this.disabled(prop, prefix)) {
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added.push(this.clone(prop, prefixed, param))
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}
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}
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}
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}
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params = params.concat(added)
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let value = this.stringify(params)
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let webkitClean = this.stringify(
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this.cleanFromUnprefixed(params, '-webkit-')
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)
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if (declPrefixes.includes('-webkit-')) {
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this.cloneBefore(decl, `-webkit-${decl.prop}`, webkitClean)
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}
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this.cloneBefore(decl, decl.prop, webkitClean)
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if (declPrefixes.includes('-o-')) {
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let operaClean = this.stringify(this.cleanFromUnprefixed(params, '-o-'))
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this.cloneBefore(decl, `-o-${decl.prop}`, operaClean)
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}
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for (prefix of declPrefixes) {
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if (prefix !== '-webkit-' && prefix !== '-o-') {
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let prefixValue = this.stringify(
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this.cleanOtherPrefixes(params, prefix)
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)
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this.cloneBefore(decl, prefix + decl.prop, prefixValue)
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}
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}
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if (value !== decl.value && !this.already(decl, decl.prop, value)) {
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this.checkForWarning(result, decl)
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decl.cloneBefore()
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decl.value = value
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}
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}
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/**
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* Does we already have this declaration
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*/
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already(decl, prop, value) {
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return decl.parent.some(i => i.prop === prop && i.value === value)
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}
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/**
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* Show transition-property warning
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*/
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checkForWarning(result, decl) {
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if (decl.prop !== 'transition-property') {
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return
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}
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let isPrefixed = false
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let hasAssociatedProp = false
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decl.parent.each(i => {
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if (i.type !== 'decl') {
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return undefined
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}
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if (i.prop.indexOf('transition-') !== 0) {
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return undefined
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}
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let values = list.comma(i.value)
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// check if current Rule's transition-property comma separated value list needs prefixes
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if (i.prop === 'transition-property') {
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values.forEach(value => {
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let lookup = this.prefixes.add[value]
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if (lookup && lookup.prefixes && lookup.prefixes.length > 0) {
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isPrefixed = true
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}
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})
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return undefined
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}
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// check if another transition-* prop in current Rule has comma separated value list
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hasAssociatedProp = hasAssociatedProp || values.length > 1
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return false
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})
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if (isPrefixed && hasAssociatedProp) {
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decl.warn(
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result,
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'Replace transition-property to transition, ' +
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'because Autoprefixer could not support ' +
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'any cases of transition-property ' +
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'and other transition-*'
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)
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}
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}
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/**
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* Remove all non-webkit prefixes and unprefixed params if we have prefixed
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*/
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cleanFromUnprefixed(params, prefix) {
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let remove = params
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.map(i => this.findProp(i))
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.filter(i => i.slice(0, prefix.length) === prefix)
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.map(i => this.prefixes.unprefixed(i))
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let result = []
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for (let param of params) {
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let prop = this.findProp(param)
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let p = vendor.prefix(prop)
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if (!remove.includes(prop) && (p === prefix || p === '')) {
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result.push(param)
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}
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}
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return result
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}
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cleanOtherPrefixes(params, prefix) {
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return params.filter(param => {
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let current = vendor.prefix(this.findProp(param))
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return current === '' || current === prefix
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})
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}
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/**
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* Return new param array with different name
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*/
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clone(origin, name, param) {
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let result = []
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let changed = false
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for (let i of param) {
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if (!changed && i.type === 'word' && i.value === origin) {
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result.push({ type: 'word', value: name })
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changed = true
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} else {
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result.push(i)
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}
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}
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return result
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}
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/**
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* Add declaration if it is not exist
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*/
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cloneBefore(decl, prop, value) {
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if (!this.already(decl, prop, value)) {
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decl.cloneBefore({ prop, value })
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}
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}
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/**
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* Check property for disabled by option
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*/
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disabled(prop, prefix) {
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let other = ['order', 'justify-content', 'align-self', 'align-content']
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if (prop.includes('flex') || other.includes(prop)) {
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if (this.prefixes.options.flexbox === false) {
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return true
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}
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if (this.prefixes.options.flexbox === 'no-2009') {
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return prefix.includes('2009')
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}
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}
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return undefined
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}
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/**
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* Find or create separator
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*/
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div(params) {
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for (let param of params) {
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for (let node of param) {
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if (node.type === 'div' && node.value === ',') {
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return node
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}
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}
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}
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return { after: ' ', type: 'div', value: ',' }
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}
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/**
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* Find property name
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*/
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findProp(param) {
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let prop = param[0].value
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if (/^\d/.test(prop)) {
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for (let [i, token] of param.entries()) {
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if (i !== 0 && token.type === 'word') {
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return token.value
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}
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}
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}
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return prop
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}
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/**
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* Parse properties list to array
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*/
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parse(value) {
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let ast = parser(value)
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let result = []
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let param = []
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for (let node of ast.nodes) {
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param.push(node)
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if (node.type === 'div' && node.value === ',') {
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result.push(param)
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param = []
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}
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}
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result.push(param)
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return result.filter(i => i.length > 0)
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}
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/**
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* Process transition and remove all unnecessary properties
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*/
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remove(decl) {
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let params = this.parse(decl.value)
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params = params.filter(i => {
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let prop = this.prefixes.remove[this.findProp(i)]
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return !prop || !prop.remove
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})
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let value = this.stringify(params)
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if (decl.value === value) {
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return
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}
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if (params.length === 0) {
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decl.remove()
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return
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}
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let double = decl.parent.some(i => {
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return i.prop === decl.prop && i.value === value
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})
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let smaller = decl.parent.some(i => {
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return i !== decl && i.prop === decl.prop && i.value.length > value.length
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})
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if (double || smaller) {
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decl.remove()
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return
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}
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decl.value = value
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}
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/**
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* Check if transition prop is inside vendor specific rule
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*/
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ruleVendorPrefixes(decl) {
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let { parent } = decl
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if (parent.type !== 'rule') {
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return false
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} else if (!parent.selector.includes(':-')) {
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return false
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}
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let selectors = Browsers.prefixes().filter(s =>
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parent.selector.includes(':' + s)
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)
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return selectors.length > 0 ? selectors : false
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}
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/**
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* Return properties string from array
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*/
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stringify(params) {
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if (params.length === 0) {
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return ''
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}
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let nodes = []
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for (let param of params) {
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if (param[param.length - 1].type !== 'div') {
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param.push(this.div(params))
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}
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nodes = nodes.concat(param)
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}
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if (nodes[0].type === 'div') {
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nodes = nodes.slice(1)
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}
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if (nodes[nodes.length - 1].type === 'div') {
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nodes = nodes.slice(0, +-2 + 1 || undefined)
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}
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return parser.stringify({ nodes })
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}
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}
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module.exports = Transition
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