vue hello world项目
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3 years ago
class OldSelector {
constructor(selector, prefix) {
this.prefix = prefix
this.prefixed = selector.prefixed(this.prefix)
this.regexp = selector.regexp(this.prefix)
this.prefixeds = selector
.possible()
.map(x => [selector.prefixed(x), selector.regexp(x)])
this.unprefixed = selector.name
this.nameRegexp = selector.regexp()
}
/**
* Is rule a hack without unprefixed version bottom
*/
isHack(rule) {
let index = rule.parent.index(rule) + 1
let rules = rule.parent.nodes
while (index < rules.length) {
let before = rules[index].selector
if (!before) {
return true
}
if (before.includes(this.unprefixed) && before.match(this.nameRegexp)) {
return false
}
let some = false
for (let [string, regexp] of this.prefixeds) {
if (before.includes(string) && before.match(regexp)) {
some = true
break
}
}
if (!some) {
return true
}
index += 1
}
return true
}
/**
* Does rule contain an unnecessary prefixed selector
*/
check(rule) {
if (!rule.selector.includes(this.prefixed)) {
return false
}
if (!rule.selector.match(this.regexp)) {
return false
}
if (this.isHack(rule)) {
return false
}
return true
}
}
module.exports = OldSelector