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'use strict';
/**
* @typedef {import('../lib/types').XastNode} XastNode
*/
const { inheritableAttrs, elemsGroups } = require('./_collections.js');
exports.name = 'collapseGroups';
exports.description = 'collapses useless groups';
/**
* @type {(node: XastNode, name: string) => boolean}
*/
const hasAnimatedAttr = (node, name) => {
if (node.type === 'element') {
if (
elemsGroups.animation.has(node.name) &&
node.attributes.attributeName === name
) {
return true;
}
for (const child of node.children) {
if (hasAnimatedAttr(child, name)) {
return true;
}
}
}
return false;
};
/**
* Collapse useless groups.
*
* @example
* <g>
* <g attr1="val1">
* <path d="..."/>
* </g>
* </g>
* ⬇
* <g>
* <g>
* <path attr1="val1" d="..."/>
* </g>
* </g>
* ⬇
* <path attr1="val1" d="..."/>
*
* @author Kir Belevich
*
* @type {import('./plugins-types').Plugin<'collapseGroups'>}
*/
exports.fn = () => {
return {
element: {
exit: (node, parentNode) => {
if (parentNode.type === 'root' || parentNode.name === 'switch') {
return;
}
// non-empty groups
if (node.name !== 'g' || node.children.length === 0) {
return;
}
// move group attributes to the single child element
if (
Object.keys(node.attributes).length !== 0 &&
node.children.length === 1
) {
const firstChild = node.children[0];
// TODO untangle this mess
if (
firstChild.type === 'element' &&
firstChild.attributes.id == null &&
node.attributes.filter == null &&
(node.attributes.class == null ||
firstChild.attributes.class == null) &&
((node.attributes['clip-path'] == null &&
node.attributes.mask == null) ||
(firstChild.name === 'g' &&
node.attributes.transform == null &&
firstChild.attributes.transform == null))
) {
for (const [name, value] of Object.entries(node.attributes)) {
// avoid copying to not conflict with animated attribute
if (hasAnimatedAttr(firstChild, name)) {
return;
}
if (firstChild.attributes[name] == null) {
firstChild.attributes[name] = value;
} else if (name === 'transform') {
firstChild.attributes[name] =
value + ' ' + firstChild.attributes[name];
} else if (firstChild.attributes[name] === 'inherit') {
firstChild.attributes[name] = value;
} else if (
inheritableAttrs.has(name) === false &&
firstChild.attributes[name] !== value
) {
return;
}
delete node.attributes[name];
}
}
}
// collapse groups without attributes
if (Object.keys(node.attributes).length === 0) {
// animation elements "add" attributes to group
// group should be preserved
for (const child of node.children) {
if (
child.type === 'element' &&
elemsGroups.animation.has(child.name)
) {
return;
}
}
// replace current node with all its children
const index = parentNode.children.indexOf(node);
parentNode.children.splice(index, 1, ...node.children);
// TODO remove legacy parentNode in v4
for (const child of node.children) {
Object.defineProperty(child, 'parentNode', {
writable: true,
value: parentNode,
});
}
}
},
},
};
};
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