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97 lines
2.3 KiB
97 lines
2.3 KiB
let FractionJs = 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 FractionJs(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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