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