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let Prefixer = require('./prefixer')
let Browsers = require('./browsers')
let utils = require('./utils')
class Declaration extends Prefixer {
/**
* Clone and add prefixes for declaration
*/
add(decl, prefix, prefixes, result) {
let prefixed = this.prefixed(decl.prop, prefix)
if (
this.isAlready(decl, prefixed) ||
this.otherPrefixes(decl.value, prefix)
) {
return undefined
}
return this.insert(decl, prefix, prefixes, result)
}
/**
* Calculate indentation to create visual cascade
*/
calcBefore(prefixes, decl, prefix = '') {
let max = this.maxPrefixed(prefixes, decl)
let diff = max - utils.removeNote(prefix).length
let before = decl.raw('before')
if (diff > 0) {
before += Array(diff).fill(' ').join('')
}
return before
}
/**
* Always true, because we already get prefixer by property name
*/
check(/* decl */) {
return true
}
/**
* Clone and insert new declaration
*/
insert(decl, prefix, prefixes) {
let cloned = this.set(this.clone(decl), prefix)
if (!cloned) return undefined
let already = decl.parent.some(
i => i.prop === cloned.prop && i.value === cloned.value
)
if (already) {
return undefined
}
if (this.needCascade(decl)) {
cloned.raws.before = this.calcBefore(prefixes, decl, prefix)
}
return decl.parent.insertBefore(decl, cloned)
}
/**
* Did this declaration has this prefix above
*/
isAlready(decl, prefixed) {
let already = this.all.group(decl).up(i => i.prop === prefixed)
if (!already) {
already = this.all.group(decl).down(i => i.prop === prefixed)
}
return already
}
/**
* Return maximum length of possible prefixed property
*/
maxPrefixed(prefixes, decl) {
if (decl._autoprefixerMax) {
return decl._autoprefixerMax
}
let max = 0
for (let prefix of prefixes) {
prefix = utils.removeNote(prefix)
if (prefix.length > max) {
max = prefix.length
}
}
decl._autoprefixerMax = max
return decl._autoprefixerMax
}
/**
* Should we use visual cascade for prefixes
*/
needCascade(decl) {
if (!decl._autoprefixerCascade) {
decl._autoprefixerCascade =
this.all.options.cascade !== false && decl.raw('before').includes('\n')
}
return decl._autoprefixerCascade
}
/**
* Return unprefixed version of property
*/
normalize(prop) {
return prop
}
/**
* Return list of prefixed properties to clean old prefixes
*/
old(prop, prefix) {
return [this.prefixed(prop, prefix)]
}
/**
* Check `value`, that it contain other prefixes, rather than `prefix`
*/
otherPrefixes(value, prefix) {
for (let other of Browsers.prefixes()) {
if (other === prefix) {
continue
}
if (value.includes(other)) {
return value.replace(/var\([^)]+\)/, '').includes(other)
}
}
return false
}
/**
* Return prefixed version of property
*/
prefixed(prop, prefix) {
return prefix + prop
}
/**
* Add spaces for visual cascade
*/
process(decl, result) {
if (!this.needCascade(decl)) {
super.process(decl, result)
return
}
let prefixes = super.process(decl, result)
if (!prefixes || !prefixes.length) {
return
}
this.restoreBefore(decl)
decl.raws.before = this.calcBefore(prefixes, decl)
}
/**
* Remove visual cascade
*/
restoreBefore(decl) {
let lines = decl.raw('before').split('\n')
let min = lines[lines.length - 1]
this.all.group(decl).up(prefixed => {
let array = prefixed.raw('before').split('\n')
let last = array[array.length - 1]
if (last.length < min.length) {
min = last
}
})
lines[lines.length - 1] = min
decl.raws.before = lines.join('\n')
}
/**
* Set prefix to declaration
*/
set(decl, prefix) {
decl.prop = this.prefixed(decl.prop, prefix)
return decl
}
}
module.exports = Declaration
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