98 lines
2.3 KiB
JavaScript
98 lines
2.3 KiB
JavaScript
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let Fraction = require('fraction.js')
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let Prefixer = require('./prefixer')
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let utils = require('./utils')
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const REGEXP = /(min|max)-resolution\s*:\s*\d*\.?\d+(dppx|dpcm|dpi|x)/gi
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const SPLIT = /(min|max)-resolution(\s*:\s*)(\d*\.?\d+)(dppx|dpcm|dpi|x)/i
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class Resolution extends Prefixer {
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/**
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* Return prefixed query name
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*/
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prefixName (prefix, name) {
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if (prefix === '-moz-') {
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return name + '--moz-device-pixel-ratio'
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} else {
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return prefix + name + '-device-pixel-ratio'
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}
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}
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/**
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* Return prefixed query
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*/
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prefixQuery (prefix, name, colon, value, units) {
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value = new Fraction(value)
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// 1dpcm = 2.54dpi
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// 1dppx = 96dpi
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if (units === 'dpi') {
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value = value.div(96)
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} else if (units === 'dpcm') {
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value = value.mul(2.54).div(96)
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}
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value = value.simplify()
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if (prefix === '-o-') {
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value = value.n + '/' + value.d
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}
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return this.prefixName(prefix, name) + colon + value
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}
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/**
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* Remove prefixed queries
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*/
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clean (rule) {
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if (!this.bad) {
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this.bad = []
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for (let prefix of this.prefixes) {
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this.bad.push(this.prefixName(prefix, 'min'))
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this.bad.push(this.prefixName(prefix, 'max'))
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}
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}
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rule.params = utils.editList(rule.params, queries => {
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return queries.filter(query => this.bad.every(i => !query.includes(i)))
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})
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}
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/**
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* Add prefixed queries
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*/
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process (rule) {
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let parent = this.parentPrefix(rule)
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let prefixes = parent ? [parent] : this.prefixes
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rule.params = utils.editList(rule.params, (origin, prefixed) => {
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for (let query of origin) {
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if (
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!query.includes('min-resolution') &&
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!query.includes('max-resolution')
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) {
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prefixed.push(query)
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continue
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}
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for (let prefix of prefixes) {
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let processed = query.replace(REGEXP, str => {
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let parts = str.match(SPLIT)
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return this.prefixQuery(
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prefix,
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parts[1],
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parts[2],
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parts[3],
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parts[4]
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)
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})
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prefixed.push(processed)
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}
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prefixed.push(query)
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}
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return utils.uniq(prefixed)
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})
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}
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}
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module.exports = Resolution
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