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66 lines
1.7 KiB
66 lines
1.7 KiB
3 years ago
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'use strict';
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/**
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* @typedef {import('../lib/types').XastElement} XastElement
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*/
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const { detachNodeFromParent } = require('../lib/xast.js');
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const { elemsGroups } = require('./_collections.js');
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exports.type = 'visitor';
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exports.name = 'removeUselessDefs';
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exports.active = true;
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exports.description = 'removes elements in <defs> without id';
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/**
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* Removes content of defs and properties that aren't rendered directly without ids.
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*
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* @author Lev Solntsev
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*
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* @type {import('../lib/types').Plugin<void>}
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*/
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exports.fn = () => {
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return {
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element: {
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enter: (node, parentNode) => {
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if (node.name === 'defs') {
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/**
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* @type {Array<XastElement>}
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*/
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const usefulNodes = [];
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collectUsefulNodes(node, usefulNodes);
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if (usefulNodes.length === 0) {
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detachNodeFromParent(node, parentNode);
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}
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// TODO remove in SVGO 3
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for (const usefulNode of usefulNodes) {
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// @ts-ignore parentNode is legacy
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usefulNode.parentNode = node;
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}
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node.children = usefulNodes;
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} else if (
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elemsGroups.nonRendering.includes(node.name) &&
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node.attributes.id == null
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) {
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detachNodeFromParent(node, parentNode);
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}
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},
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},
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};
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};
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/**
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* @type {(node: XastElement, usefulNodes: Array<XastElement>) => void}
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*/
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const collectUsefulNodes = (node, usefulNodes) => {
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for (const child of node.children) {
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if (child.type === 'element') {
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if (child.attributes.id != null || child.name === 'style') {
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usefulNodes.push(child);
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} else {
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collectUsefulNodes(child, usefulNodes);
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}
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}
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}
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};
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