74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
const cssTree = require('css-tree');
|
||
|
|
const utils = require('./utils.cjs');
|
||
|
|
|
||
|
|
function cleanAtrule(node, item, list) {
|
||
|
|
if (node.block) {
|
||
|
|
// otherwise removed at-rule don't prevent @import for removal
|
||
|
|
if (this.stylesheet !== null) {
|
||
|
|
this.stylesheet.firstAtrulesAllowed = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (utils.hasNoChildren(node.block)) {
|
||
|
|
list.remove(item);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (node.name) {
|
||
|
|
case 'charset':
|
||
|
|
if (utils.hasNoChildren(node.prelude)) {
|
||
|
|
list.remove(item);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// if there is any rule before @charset -> remove it
|
||
|
|
if (item.prev) {
|
||
|
|
list.remove(item);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 'import':
|
||
|
|
if (this.stylesheet === null || !this.stylesheet.firstAtrulesAllowed) {
|
||
|
|
list.remove(item);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// if there are some rules that not an @import or @charset before @import
|
||
|
|
// remove it
|
||
|
|
list.prevUntil(item.prev, function(rule) {
|
||
|
|
if (rule.type === 'Atrule') {
|
||
|
|
if (rule.name === 'import' || rule.name === 'charset') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
this.root.firstAtrulesAllowed = false;
|
||
|
|
list.remove(item);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}, this);
|
||
|
|
|
||
|
|
break;
|
||
|
|
|
||
|
|
default: {
|
||
|
|
const name = cssTree.keyword(node.name).basename;
|
||
|
|
|
||
|
|
if (name === 'keyframes' ||
|
||
|
|
name === 'media' ||
|
||
|
|
name === 'supports') {
|
||
|
|
|
||
|
|
// drop at-rule with no prelude
|
||
|
|
if (utils.hasNoChildren(node.prelude) || utils.hasNoChildren(node.block)) {
|
||
|
|
list.remove(item);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = cleanAtrule;
|