105 lines
2.9 KiB
JavaScript
105 lines
2.9 KiB
JavaScript
'use strict';
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const { detachNodeFromParent } = require('../lib/xast.js');
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const { collectStylesheet, computeStyle } = require('../lib/style.js');
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const { path2js, js2path, intersects } = require('./_path.js');
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exports.type = 'visitor';
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exports.name = 'mergePaths';
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exports.active = true;
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exports.description = 'merges multiple paths in one if possible';
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/**
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* Merge multiple Paths into one.
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*
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* @author Kir Belevich, Lev Solntsev
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*
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* @type {import('../lib/types').Plugin<{
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* force?: boolean,
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* floatPrecision?: number,
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* noSpaceAfterFlags?: boolean
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* }>}
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*/
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exports.fn = (root, params) => {
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const {
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force = false,
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floatPrecision,
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noSpaceAfterFlags = false, // a20 60 45 0 1 30 20 → a20 60 45 0130 20
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} = params;
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const stylesheet = collectStylesheet(root);
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return {
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element: {
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enter: (node) => {
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let prevChild = null;
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for (const child of node.children) {
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// skip if previous element is not path or contains animation elements
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if (
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prevChild == null ||
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prevChild.type !== 'element' ||
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prevChild.name !== 'path' ||
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prevChild.children.length !== 0 ||
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prevChild.attributes.d == null
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) {
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prevChild = child;
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continue;
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}
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// skip if element is not path or contains animation elements
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if (
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child.type !== 'element' ||
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child.name !== 'path' ||
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child.children.length !== 0 ||
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child.attributes.d == null
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) {
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prevChild = child;
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continue;
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}
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// preserve paths with markers
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const computedStyle = computeStyle(stylesheet, child);
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if (
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computedStyle['marker-start'] ||
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computedStyle['marker-mid'] ||
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computedStyle['marker-end']
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) {
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prevChild = child;
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continue;
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}
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const prevChildAttrs = Object.keys(prevChild.attributes);
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const childAttrs = Object.keys(child.attributes);
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let attributesAreEqual = prevChildAttrs.length === childAttrs.length;
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for (const name of childAttrs) {
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if (name !== 'd') {
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if (
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prevChild.attributes[name] == null ||
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prevChild.attributes[name] !== child.attributes[name]
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) {
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attributesAreEqual = false;
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}
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}
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}
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const prevPathJS = path2js(prevChild);
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const curPathJS = path2js(child);
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if (
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attributesAreEqual &&
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(force || !intersects(prevPathJS, curPathJS))
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) {
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js2path(prevChild, prevPathJS.concat(curPathJS), {
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floatPrecision,
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noSpaceAfterFlags,
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});
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detachNodeFromParent(child, node);
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continue;
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}
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prevChild = child;
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}
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},
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},
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};
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};
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