449 lines
10 KiB
JavaScript
449 lines
10 KiB
JavaScript
let parser = require('postcss-value-parser')
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let range = require('normalize-range')
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let OldValue = require('../old-value')
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let Value = require('../value')
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let utils = require('../utils')
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let IS_DIRECTION = /top|left|right|bottom/gi
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class Gradient extends Value {
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/**
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* Change degrees for webkit prefix
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*/
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replace(string, prefix) {
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let ast = parser(string)
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for (let node of ast.nodes) {
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let gradientName = this.name // gradient name
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if (node.type === 'function' && node.value === gradientName) {
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node.nodes = this.newDirection(node.nodes)
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node.nodes = this.normalize(node.nodes, gradientName)
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if (prefix === '-webkit- old') {
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let changes = this.oldWebkit(node)
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if (!changes) {
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return false
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}
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} else {
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node.nodes = this.convertDirection(node.nodes)
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node.value = prefix + node.value
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}
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}
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}
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return ast.toString()
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}
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/**
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* Replace first token
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*/
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replaceFirst(params, ...words) {
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let prefix = words.map(i => {
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if (i === ' ') {
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return { type: 'space', value: i }
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}
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return { type: 'word', value: i }
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})
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return prefix.concat(params.slice(1))
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}
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/**
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* Convert angle unit to deg
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*/
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normalizeUnit(str, full) {
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let num = parseFloat(str)
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let deg = (num / full) * 360
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return `${deg}deg`
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}
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/**
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* Normalize angle
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*/
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normalize(nodes, gradientName) {
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if (!nodes[0]) return nodes
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if (/-?\d+(.\d+)?grad/.test(nodes[0].value)) {
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nodes[0].value = this.normalizeUnit(nodes[0].value, 400)
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} else if (/-?\d+(.\d+)?rad/.test(nodes[0].value)) {
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nodes[0].value = this.normalizeUnit(nodes[0].value, 2 * Math.PI)
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} else if (/-?\d+(.\d+)?turn/.test(nodes[0].value)) {
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nodes[0].value = this.normalizeUnit(nodes[0].value, 1)
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} else if (nodes[0].value.includes('deg')) {
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let num = parseFloat(nodes[0].value)
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num = range.wrap(0, 360, num)
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nodes[0].value = `${num}deg`
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}
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if (
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gradientName === 'linear-gradient' ||
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gradientName === 'repeating-linear-gradient'
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) {
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let direction = nodes[0].value
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// Unitless zero for `<angle>` values are allowed in CSS gradients and transforms.
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// Spec: https://github.com/w3c/csswg-drafts/commit/602789171429b2231223ab1e5acf8f7f11652eb3
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if (direction === '0deg' || direction === '0') {
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nodes = this.replaceFirst(nodes, 'to', ' ', 'top')
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} else if (direction === '90deg') {
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nodes = this.replaceFirst(nodes, 'to', ' ', 'right')
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} else if (direction === '180deg') {
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nodes = this.replaceFirst(nodes, 'to', ' ', 'bottom') // default value
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} else if (direction === '270deg') {
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nodes = this.replaceFirst(nodes, 'to', ' ', 'left')
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}
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}
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return nodes
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}
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/**
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* Replace old direction to new
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*/
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newDirection(params) {
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if (params[0].value === 'to') {
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return params
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}
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IS_DIRECTION.lastIndex = 0 // reset search index of global regexp
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if (!IS_DIRECTION.test(params[0].value)) {
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return params
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}
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params.unshift(
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{
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type: 'word',
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value: 'to'
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},
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{
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type: 'space',
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value: ' '
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}
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)
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for (let i = 2; i < params.length; i++) {
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if (params[i].type === 'div') {
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break
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}
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if (params[i].type === 'word') {
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params[i].value = this.revertDirection(params[i].value)
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}
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}
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return params
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}
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/**
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* Look for at word
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*/
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isRadial(params) {
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let state = 'before'
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for (let param of params) {
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if (state === 'before' && param.type === 'space') {
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state = 'at'
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} else if (state === 'at' && param.value === 'at') {
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state = 'after'
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} else if (state === 'after' && param.type === 'space') {
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return true
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} else if (param.type === 'div') {
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break
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} else {
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state = 'before'
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}
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}
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return false
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}
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/**
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* Change new direction to old
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*/
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convertDirection(params) {
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if (params.length > 0) {
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if (params[0].value === 'to') {
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this.fixDirection(params)
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} else if (params[0].value.includes('deg')) {
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this.fixAngle(params)
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} else if (this.isRadial(params)) {
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this.fixRadial(params)
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}
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}
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return params
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}
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/**
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* Replace `to top left` to `bottom right`
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*/
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fixDirection(params) {
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params.splice(0, 2)
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for (let param of params) {
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if (param.type === 'div') {
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break
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}
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if (param.type === 'word') {
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param.value = this.revertDirection(param.value)
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}
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}
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}
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/**
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* Add 90 degrees
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*/
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fixAngle(params) {
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let first = params[0].value
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first = parseFloat(first)
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first = Math.abs(450 - first) % 360
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first = this.roundFloat(first, 3)
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params[0].value = `${first}deg`
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}
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/**
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* Fix radial direction syntax
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*/
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fixRadial(params) {
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let first = []
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let second = []
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let a, b, c, i, next
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for (i = 0; i < params.length - 2; i++) {
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a = params[i]
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b = params[i + 1]
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c = params[i + 2]
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if (a.type === 'space' && b.value === 'at' && c.type === 'space') {
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next = i + 3
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break
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} else {
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first.push(a)
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}
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}
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let div
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for (i = next; i < params.length; i++) {
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if (params[i].type === 'div') {
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div = params[i]
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break
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} else {
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second.push(params[i])
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}
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}
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params.splice(0, i, ...second, div, ...first)
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}
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revertDirection(word) {
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return Gradient.directions[word.toLowerCase()] || word
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}
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/**
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* Round float and save digits under dot
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*/
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roundFloat(float, digits) {
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return parseFloat(float.toFixed(digits))
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}
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/**
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* Convert to old webkit syntax
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*/
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oldWebkit(node) {
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let { nodes } = node
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let string = parser.stringify(node.nodes)
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if (this.name !== 'linear-gradient') {
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return false
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}
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if (nodes[0] && nodes[0].value.includes('deg')) {
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return false
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}
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if (
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string.includes('px') ||
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string.includes('-corner') ||
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string.includes('-side')
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) {
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return false
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}
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let params = [[]]
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for (let i of nodes) {
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params[params.length - 1].push(i)
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if (i.type === 'div' && i.value === ',') {
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params.push([])
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}
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}
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this.oldDirection(params)
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this.colorStops(params)
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node.nodes = []
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for (let param of params) {
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node.nodes = node.nodes.concat(param)
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}
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node.nodes.unshift(
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{ type: 'word', value: 'linear' },
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this.cloneDiv(node.nodes)
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)
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node.value = '-webkit-gradient'
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return true
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}
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/**
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* Change direction syntax to old webkit
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*/
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oldDirection(params) {
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let div = this.cloneDiv(params[0])
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if (params[0][0].value !== 'to') {
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return params.unshift([
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{ type: 'word', value: Gradient.oldDirections.bottom },
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div
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])
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} else {
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let words = []
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for (let node of params[0].slice(2)) {
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if (node.type === 'word') {
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words.push(node.value.toLowerCase())
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}
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}
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words = words.join(' ')
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let old = Gradient.oldDirections[words] || words
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params[0] = [{ type: 'word', value: old }, div]
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return params[0]
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}
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}
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/**
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* Get div token from exists parameters
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*/
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cloneDiv(params) {
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for (let i of params) {
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if (i.type === 'div' && i.value === ',') {
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return i
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}
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}
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return { type: 'div', value: ',', after: ' ' }
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}
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/**
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* Change colors syntax to old webkit
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*/
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colorStops(params) {
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let result = []
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for (let i = 0; i < params.length; i++) {
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let pos
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let param = params[i]
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let item
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if (i === 0) {
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continue
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}
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let color = parser.stringify(param[0])
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if (param[1] && param[1].type === 'word') {
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pos = param[1].value
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} else if (param[2] && param[2].type === 'word') {
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pos = param[2].value
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}
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let stop
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if (i === 1 && (!pos || pos === '0%')) {
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stop = `from(${color})`
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} else if (i === params.length - 1 && (!pos || pos === '100%')) {
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stop = `to(${color})`
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} else if (pos) {
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stop = `color-stop(${pos}, ${color})`
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} else {
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stop = `color-stop(${color})`
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}
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let div = param[param.length - 1]
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params[i] = [{ type: 'word', value: stop }]
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if (div.type === 'div' && div.value === ',') {
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item = params[i].push(div)
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}
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result.push(item)
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}
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return result
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}
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/**
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* Remove old WebKit gradient too
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*/
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old(prefix) {
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if (prefix === '-webkit-') {
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let type
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if (this.name === 'linear-gradient') {
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type = 'linear'
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} else if (this.name === 'repeating-linear-gradient') {
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type = 'repeating-linear'
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} else if (this.name === 'repeating-radial-gradient') {
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type = 'repeating-radial'
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} else {
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type = 'radial'
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}
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let string = '-gradient'
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let regexp = utils.regexp(
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`-webkit-(${type}-gradient|gradient\\(\\s*${type})`,
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false
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)
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return new OldValue(this.name, prefix + this.name, string, regexp)
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} else {
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return super.old(prefix)
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}
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}
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/**
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* Do not add non-webkit prefixes for list-style and object
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*/
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add(decl, prefix) {
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let p = decl.prop
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if (p.includes('mask')) {
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if (prefix === '-webkit-' || prefix === '-webkit- old') {
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return super.add(decl, prefix)
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}
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} else if (
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p === 'list-style' ||
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p === 'list-style-image' ||
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p === 'content'
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) {
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if (prefix === '-webkit-' || prefix === '-webkit- old') {
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return super.add(decl, prefix)
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}
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} else {
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return super.add(decl, prefix)
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}
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return undefined
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}
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}
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Gradient.names = [
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'linear-gradient',
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'repeating-linear-gradient',
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'radial-gradient',
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'repeating-radial-gradient'
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]
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Gradient.directions = {
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top: 'bottom', // default value
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left: 'right',
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bottom: 'top',
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right: 'left'
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}
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// Direction to replace
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Gradient.oldDirections = {
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'top': 'left bottom, left top',
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'left': 'right top, left top',
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'bottom': 'left top, left bottom',
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'right': 'left top, right top',
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'top right': 'left bottom, right top',
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'top left': 'right bottom, left top',
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'right top': 'left bottom, right top',
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'right bottom': 'left top, right bottom',
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'bottom right': 'left top, right bottom',
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'bottom left': 'right top, left bottom',
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'left top': 'right bottom, left top',
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'left bottom': 'right top, left bottom'
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}
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module.exports = Gradient
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