76 lines
2.0 KiB
JavaScript
76 lines
2.0 KiB
JavaScript
'use strict';
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const { visit } = require('../lib/xast.js');
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exports.type = 'visitor';
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exports.name = 'cleanupEnableBackground';
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exports.active = true;
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exports.description =
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'remove or cleanup enable-background attribute when possible';
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/**
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* Remove or cleanup enable-background attr which coincides with a width/height box.
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*
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* @see https://www.w3.org/TR/SVG11/filters.html#EnableBackgroundProperty
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*
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* @example
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* <svg width="100" height="50" enable-background="new 0 0 100 50">
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* ⬇
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* <svg width="100" height="50">
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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 = (root) => {
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const regEnableBackground =
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/^new\s0\s0\s([-+]?\d*\.?\d+([eE][-+]?\d+)?)\s([-+]?\d*\.?\d+([eE][-+]?\d+)?)$/;
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let hasFilter = false;
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visit(root, {
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element: {
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enter: (node) => {
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if (node.name === 'filter') {
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hasFilter = true;
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}
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},
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},
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});
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return {
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element: {
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enter: (node) => {
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if (node.attributes['enable-background'] == null) {
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return;
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}
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if (hasFilter) {
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if (
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(node.name === 'svg' ||
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node.name === 'mask' ||
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node.name === 'pattern') &&
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node.attributes.width != null &&
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node.attributes.height != null
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) {
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const match =
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node.attributes['enable-background'].match(regEnableBackground);
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if (
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match != null &&
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node.attributes.width === match[1] &&
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node.attributes.height === match[3]
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) {
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if (node.name === 'svg') {
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delete node.attributes['enable-background'];
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} else {
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node.attributes['enable-background'] = 'new';
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}
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}
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}
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} else {
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//we don't need 'enable-background' if we have no filters
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delete node.attributes['enable-background'];
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}
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},
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},
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};
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};
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