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93 lines
2.3 KiB
93 lines
2.3 KiB
'use strict';
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/**
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* @typedef {import('../lib/types').XastElement} XastElement
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*/
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const { visitSkip, detachNodeFromParent } = require('../lib/xast.js');
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const JSAPI = require('../lib/svgo/jsAPI.js');
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exports.name = 'mergeStyles';
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exports.type = 'visitor';
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exports.active = true;
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exports.description = 'merge multiple style elements into one';
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/**
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* Merge multiple style elements into one.
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*
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* @author strarsis <strarsis@gmail.com>
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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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/**
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* @type {null | XastElement}
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*/
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let firstStyleElement = null;
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let collectedStyles = '';
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let styleContentType = 'text';
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return {
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element: {
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enter: (node, parentNode) => {
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// skip <foreignObject> content
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if (node.name === 'foreignObject') {
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return visitSkip;
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}
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// collect style elements
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if (node.name !== 'style') {
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return;
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}
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// skip <style> with invalid type attribute
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if (
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node.attributes.type != null &&
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node.attributes.type !== '' &&
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node.attributes.type !== 'text/css'
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) {
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return;
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}
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// extract style element content
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let css = '';
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for (const child of node.children) {
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if (child.type === 'text') {
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css += child.value;
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}
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if (child.type === 'cdata') {
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styleContentType = 'cdata';
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css += child.value;
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}
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}
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// remove empty style elements
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if (css.trim().length === 0) {
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detachNodeFromParent(node, parentNode);
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return;
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}
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// collect css and wrap with media query if present in attribute
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if (node.attributes.media == null) {
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collectedStyles += css;
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} else {
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collectedStyles += `@media ${node.attributes.media}{${css}}`;
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delete node.attributes.media;
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}
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// combine collected styles in the first style element
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if (firstStyleElement == null) {
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firstStyleElement = node;
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} else {
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detachNodeFromParent(node, parentNode);
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firstStyleElement.children = [
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new JSAPI(
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{ type: styleContentType, value: collectedStyles },
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firstStyleElement
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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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};
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