Last change
on this file since e29cc2e was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
2.0 KB
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[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | const { visit } = require('../lib/xast.js');
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| 4 |
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| 5 | exports.type = 'visitor';
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| 6 | exports.name = 'cleanupEnableBackground';
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| 7 | exports.active = true;
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| 8 | exports.description =
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| 9 | 'remove or cleanup enable-background attribute when possible';
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| 10 |
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| 11 | /**
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| 12 | * Remove or cleanup enable-background attr which coincides with a width/height box.
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| 13 | *
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| 14 | * @see https://www.w3.org/TR/SVG11/filters.html#EnableBackgroundProperty
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| 15 | *
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| 16 | * @example
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| 17 | * <svg width="100" height="50" enable-background="new 0 0 100 50">
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| 18 | * ⬇
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| 19 | * <svg width="100" height="50">
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| 20 | *
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| 21 | * @author Kir Belevich
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| 22 | *
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| 23 | * @type {import('../lib/types').Plugin<void>}
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| 24 | */
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| 25 | exports.fn = (root) => {
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| 26 | const regEnableBackground =
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| 27 | /^new\s0\s0\s([-+]?\d*\.?\d+([eE][-+]?\d+)?)\s([-+]?\d*\.?\d+([eE][-+]?\d+)?)$/;
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| 28 |
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| 29 | let hasFilter = false;
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| 30 | visit(root, {
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| 31 | element: {
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| 32 | enter: (node) => {
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| 33 | if (node.name === 'filter') {
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| 34 | hasFilter = true;
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| 35 | }
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| 36 | },
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| 37 | },
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| 38 | });
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| 39 |
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| 40 | return {
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| 41 | element: {
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| 42 | enter: (node) => {
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| 43 | if (node.attributes['enable-background'] == null) {
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| 44 | return;
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| 45 | }
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| 46 | if (hasFilter) {
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| 47 | if (
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| 48 | (node.name === 'svg' ||
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| 49 | node.name === 'mask' ||
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| 50 | node.name === 'pattern') &&
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| 51 | node.attributes.width != null &&
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| 52 | node.attributes.height != null
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| 53 | ) {
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| 54 | const match =
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| 55 | node.attributes['enable-background'].match(regEnableBackground);
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| 56 | if (
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| 57 | match != null &&
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| 58 | node.attributes.width === match[1] &&
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| 59 | node.attributes.height === match[3]
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| 60 | ) {
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| 61 | if (node.name === 'svg') {
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| 62 | delete node.attributes['enable-background'];
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| 63 | } else {
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| 64 | node.attributes['enable-background'] = 'new';
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| 65 | }
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| 66 | }
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| 67 | }
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| 68 | } else {
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| 69 | //we don't need 'enable-background' if we have no filters
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| 70 | delete node.attributes['enable-background'];
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| 71 | }
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| 72 | },
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| 73 | },
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| 74 | };
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| 75 | };
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