flex.js•1.17 kB
let list = require('postcss').list
let Declaration = require('../declaration')
let flexSpec = require('./flex-spec')
class Flex extends Declaration {
/**
* Return property name by final spec
*/
normalize() {
return 'flex'
}
/**
* Change property name for 2009 spec
*/
prefixed(prop, prefix) {
let spec
;[spec, prefix] = flexSpec(prefix)
if (spec === 2009) {
return prefix + 'box-flex'
}
return super.prefixed(prop, prefix)
}
/**
* Spec 2009 supports only first argument
* Spec 2012 disallows unitless basis
*/
set(decl, prefix) {
let spec = flexSpec(prefix)[0]
if (spec === 2009) {
decl.value = list.space(decl.value)[0]
decl.value = Flex.oldValues[decl.value] || decl.value
return super.set(decl, prefix)
}
if (spec === 2012) {
let components = list.space(decl.value)
if (components.length === 3 && components[2] === '0') {
decl.value = components.slice(0, 2).concat('0px').join(' ')
}
}
return super.set(decl, prefix)
}
}
Flex.names = ['flex', 'box-flex']
Flex.oldValues = {
auto: '1',
none: '0'
}
module.exports = Flex