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135 lines
3.8 KiB
135 lines
3.8 KiB
'use strict';
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/**
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* @typedef {import('../lib/types').XastNode} XastNode
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*/
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const { inheritableAttrs, elemsGroups } = require('./_collections.js');
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exports.type = 'visitor';
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exports.name = 'collapseGroups';
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exports.active = true;
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exports.description = 'collapses useless groups';
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/**
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* @type {(node: XastNode, name: string) => boolean}
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*/
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const hasAnimatedAttr = (node, name) => {
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if (node.type === 'element') {
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if (
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elemsGroups.animation.includes(node.name) &&
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node.attributes.attributeName === name
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) {
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return true;
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}
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for (const child of node.children) {
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if (hasAnimatedAttr(child, name)) {
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return true;
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}
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}
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}
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return false;
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};
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/**
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* Collapse useless groups.
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*
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* @example
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* <g>
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* <g attr1="val1">
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* <path d="..."/>
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* </g>
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* </g>
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* ⬇
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* <g>
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* <g>
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* <path attr1="val1" d="..."/>
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* </g>
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* </g>
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* ⬇
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* <path attr1="val1" d="..."/>
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*
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* @author Kir Belevich
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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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exit: (node, parentNode) => {
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if (parentNode.type === 'root' || parentNode.name === 'switch') {
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return;
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}
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// non-empty groups
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if (node.name !== 'g' || node.children.length === 0) {
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return;
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}
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// move group attibutes to the single child element
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if (
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Object.keys(node.attributes).length !== 0 &&
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node.children.length === 1
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) {
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const firstChild = node.children[0];
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// TODO untangle this mess
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if (
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firstChild.type === 'element' &&
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firstChild.attributes.id == null &&
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node.attributes.filter == null &&
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(node.attributes.class == null ||
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firstChild.attributes.class == null) &&
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((node.attributes['clip-path'] == null &&
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node.attributes.mask == null) ||
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(firstChild.name === 'g' &&
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node.attributes.transform == null &&
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firstChild.attributes.transform == null))
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) {
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for (const [name, value] of Object.entries(node.attributes)) {
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// avoid copying to not conflict with animated attribute
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if (hasAnimatedAttr(firstChild, name)) {
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return;
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}
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if (firstChild.attributes[name] == null) {
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firstChild.attributes[name] = value;
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} else if (name === 'transform') {
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firstChild.attributes[name] =
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value + ' ' + firstChild.attributes[name];
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} else if (firstChild.attributes[name] === 'inherit') {
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firstChild.attributes[name] = value;
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} else if (
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inheritableAttrs.includes(name) === false &&
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firstChild.attributes[name] !== value
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) {
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return;
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}
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delete node.attributes[name];
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}
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}
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}
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// collapse groups without attributes
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if (Object.keys(node.attributes).length === 0) {
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// animation elements "add" attributes to group
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// group should be preserved
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for (const child of node.children) {
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if (
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child.type === 'element' &&
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elemsGroups.animation.includes(child.name)
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) {
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return;
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}
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}
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// replace current node with all its children
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const index = parentNode.children.indexOf(node);
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parentNode.children.splice(index, 1, ...node.children);
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// TODO remove in v3
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for (const child of node.children) {
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// @ts-ignore parentNode is forbidden for public usage
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// and will be moved in v3
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child.parentNode = 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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