let n2f = require('num2fraction') let Prefixer = require('./prefixer') let utils = require('./utils') const REGEXP = /(min|max)-resolution\s*:\s*\d*\.?\d+(dppx|dpi|x)/gi const SPLIT = /(min|max)-resolution(\s*:\s*)(\d*\.?\d+)(dppx|dpi|x)/i class Resolution extends Prefixer { /** * Return prefixed query name */ prefixName (prefix, name) { if (prefix === '-moz-') { return name + '--moz-device-pixel-ratio' } else { return prefix + name + '-device-pixel-ratio' } } /** * Return prefixed query */ prefixQuery (prefix, name, colon, value, units) { if (units === 'dpi') { value = Number(value / 96) } if (prefix === '-o-') { value = n2f(value) } return this.prefixName(prefix, name) + colon + value } /** * Remove prefixed queries */ clean (rule) { if (!this.bad) { this.bad = [] for (let prefix of this.prefixes) { this.bad.push(this.prefixName(prefix, 'min')) this.bad.push(this.prefixName(prefix, 'max')) } } rule.params = utils.editList(rule.params, queries => { return queries.filter(query => this.bad.every(i => !query.includes(i))) }) } /** * Add prefixed queries */ process (rule) { let parent = this.parentPrefix(rule) let prefixes = parent ? [parent] : this.prefixes rule.params = utils.editList(rule.params, (origin, prefixed) => { for (let query of origin) { if ( !query.includes('min-resolution') && !query.includes('max-resolution') ) { prefixed.push(query) continue } for (let prefix of prefixes) { let processed = query.replace(REGEXP, str => { let parts = str.match(SPLIT) return this.prefixQuery( prefix, parts[1], parts[2], parts[3], parts[4] ) }) prefixed.push(processed) } prefixed.push(query) } return utils.uniq(prefixed) }) } } module.exports = Resolution