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