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380 lines
12 KiB
380 lines
12 KiB
1 month ago
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'use strict';
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/**
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* @typedef {import('../lib/types').Specificity} Specificity
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* @typedef {import('../lib/types').XastElement} XastElement
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* @typedef {import('../lib/types').XastParent} XastParent
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*/
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const csstree = require('css-tree');
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// @ts-ignore not defined in @types/csso
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const specificity = require('csso/lib/restructure/prepare/specificity');
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const stable = require('stable');
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const {
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visitSkip,
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querySelectorAll,
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detachNodeFromParent,
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} = require('../lib/xast.js');
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exports.type = 'visitor';
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exports.name = 'inlineStyles';
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exports.active = true;
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exports.description = 'inline styles (additional options)';
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/**
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* Compares two selector specificities.
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* extracted from https://github.com/keeganstreet/specificity/blob/master/specificity.js#L211
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*
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* @type {(a: Specificity, b: Specificity) => number}
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*/
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const compareSpecificity = (a, b) => {
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for (var i = 0; i < 4; i += 1) {
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if (a[i] < b[i]) {
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return -1;
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} else if (a[i] > b[i]) {
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return 1;
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}
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}
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return 0;
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};
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/**
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* Moves + merges styles from style elements to element styles
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*
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* Options
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* onlyMatchedOnce (default: true)
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* inline only selectors that match once
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*
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* removeMatchedSelectors (default: true)
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* clean up matched selectors,
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* leave selectors that hadn't matched
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*
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* useMqs (default: ['', 'screen'])
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* what media queries to be used
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* empty string element for styles outside media queries
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*
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* usePseudos (default: [''])
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* what pseudo-classes/-elements to be used
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* empty string element for all non-pseudo-classes and/or -elements
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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<{
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* onlyMatchedOnce?: boolean,
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* removeMatchedSelectors?: boolean,
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* useMqs?: Array<string>,
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* usePseudos?: Array<string>
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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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onlyMatchedOnce = true,
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removeMatchedSelectors = true,
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useMqs = ['', 'screen'],
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usePseudos = [''],
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} = params;
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/**
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* @type {Array<{ node: XastElement, parentNode: XastParent, cssAst: csstree.StyleSheet }>}
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*/
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const styles = [];
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/**
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* @type {Array<{
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* node: csstree.Selector,
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* item: csstree.ListItem<csstree.CssNode>,
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* rule: csstree.Rule,
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* matchedElements?: Array<XastElement>
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* }>}
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*/
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let selectors = [];
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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 only non-empty <style /> elements
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if (node.name !== 'style' || node.children.length === 0) {
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return;
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}
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// values other than the empty string or text/css are not used
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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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// parse css in style element
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let cssText = '';
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for (const child of node.children) {
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if (child.type === 'text' || child.type === 'cdata') {
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cssText += child.value;
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}
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}
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/**
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* @type {null | csstree.CssNode}
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*/
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let cssAst = null;
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try {
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cssAst = csstree.parse(cssText, {
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parseValue: false,
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parseCustomProperty: false,
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});
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} catch {
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return;
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}
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if (cssAst.type === 'StyleSheet') {
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styles.push({ node, parentNode, cssAst });
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}
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// collect selectors
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csstree.walk(cssAst, {
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visit: 'Selector',
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enter(node, item) {
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const atrule = this.atrule;
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const rule = this.rule;
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if (rule == null) {
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return;
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}
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// skip media queries not included into useMqs param
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let mq = '';
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if (atrule != null) {
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mq = atrule.name;
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if (atrule.prelude != null) {
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mq += ` ${csstree.generate(atrule.prelude)}`;
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}
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}
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if (useMqs.includes(mq) === false) {
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return;
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}
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/**
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* @type {Array<{
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* item: csstree.ListItem<csstree.CssNode>,
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* list: csstree.List<csstree.CssNode>
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* }>}
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*/
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const pseudos = [];
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if (node.type === 'Selector') {
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node.children.each((childNode, childItem, childList) => {
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if (
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childNode.type === 'PseudoClassSelector' ||
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childNode.type === 'PseudoElementSelector'
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) {
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pseudos.push({ item: childItem, list: childList });
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}
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});
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}
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// skip pseudo classes and pseudo elements not includes into usePseudos param
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const pseudoSelectors = csstree.generate({
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type: 'Selector',
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children: new csstree.List().fromArray(
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pseudos.map((pseudo) => pseudo.item.data)
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),
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});
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if (usePseudos.includes(pseudoSelectors) === false) {
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return;
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}
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// remove pseudo classes and elements to allow querySelector match elements
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// TODO this is not very accurate since some pseudo classes like first-child
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// are used for selection
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for (const pseudo of pseudos) {
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pseudo.list.remove(pseudo.item);
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}
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selectors.push({ node, item, rule });
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},
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});
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},
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},
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root: {
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exit: () => {
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if (styles.length === 0) {
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return;
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}
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// stable sort selectors
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const sortedSelectors = stable(selectors, (a, b) => {
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const aSpecificity = specificity(a.item.data);
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const bSpecificity = specificity(b.item.data);
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return compareSpecificity(aSpecificity, bSpecificity);
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}).reverse();
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for (const selector of sortedSelectors) {
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// match selectors
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const selectorText = csstree.generate(selector.item.data);
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/**
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* @type {Array<XastElement>}
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*/
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const matchedElements = [];
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try {
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for (const node of querySelectorAll(root, selectorText)) {
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if (node.type === 'element') {
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matchedElements.push(node);
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}
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}
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} catch (selectError) {
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continue;
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}
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// nothing selected
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if (matchedElements.length === 0) {
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continue;
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}
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// apply styles to matched elements
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// skip selectors that match more than once if option onlyMatchedOnce is enabled
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if (onlyMatchedOnce && matchedElements.length > 1) {
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continue;
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}
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// apply <style/> to matched elements
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for (const selectedEl of matchedElements) {
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const styleDeclarationList = csstree.parse(
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selectedEl.attributes.style == null
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? ''
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: selectedEl.attributes.style,
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{
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context: 'declarationList',
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parseValue: false,
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}
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);
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if (styleDeclarationList.type !== 'DeclarationList') {
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continue;
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}
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const styleDeclarationItems = new Map();
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csstree.walk(styleDeclarationList, {
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visit: 'Declaration',
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enter(node, item) {
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styleDeclarationItems.set(node.property, item);
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},
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});
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// merge declarations
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csstree.walk(selector.rule, {
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visit: 'Declaration',
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enter(ruleDeclaration) {
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// existing inline styles have higher priority
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// no inline styles, external styles, external styles used
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// inline styles, external styles same priority as inline styles, inline styles used
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// inline styles, external styles higher priority than inline styles, external styles used
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const matchedItem = styleDeclarationItems.get(
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ruleDeclaration.property
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);
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const ruleDeclarationItem =
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styleDeclarationList.children.createItem(ruleDeclaration);
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if (matchedItem == null) {
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styleDeclarationList.children.append(ruleDeclarationItem);
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} else if (
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matchedItem.data.important !== true &&
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ruleDeclaration.important === true
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) {
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styleDeclarationList.children.replace(
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matchedItem,
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ruleDeclarationItem
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);
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styleDeclarationItems.set(
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ruleDeclaration.property,
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ruleDeclarationItem
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);
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}
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},
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});
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selectedEl.attributes.style =
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csstree.generate(styleDeclarationList);
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}
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if (
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removeMatchedSelectors &&
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matchedElements.length !== 0 &&
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selector.rule.prelude.type === 'SelectorList'
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) {
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// clean up matching simple selectors if option removeMatchedSelectors is enabled
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selector.rule.prelude.children.remove(selector.item);
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}
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selector.matchedElements = matchedElements;
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}
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// no further processing required
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if (removeMatchedSelectors === false) {
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return;
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}
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// clean up matched class + ID attribute values
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for (const selector of sortedSelectors) {
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if (selector.matchedElements == null) {
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continue;
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}
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if (onlyMatchedOnce && selector.matchedElements.length > 1) {
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// skip selectors that match more than once if option onlyMatchedOnce is enabled
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continue;
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}
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for (const selectedEl of selector.matchedElements) {
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// class
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const classList = new Set(
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selectedEl.attributes.class == null
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? null
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: selectedEl.attributes.class.split(' ')
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);
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const firstSubSelector = selector.node.children.first();
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if (
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firstSubSelector != null &&
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firstSubSelector.type === 'ClassSelector'
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) {
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classList.delete(firstSubSelector.name);
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}
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if (classList.size === 0) {
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delete selectedEl.attributes.class;
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} else {
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selectedEl.attributes.class = Array.from(classList).join(' ');
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}
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// ID
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if (
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firstSubSelector != null &&
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firstSubSelector.type === 'IdSelector'
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) {
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if (selectedEl.attributes.id === firstSubSelector.name) {
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delete selectedEl.attributes.id;
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}
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}
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}
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}
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for (const style of styles) {
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csstree.walk(style.cssAst, {
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visit: 'Rule',
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enter: function (node, item, list) {
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// clean up <style/> rulesets without any css selectors left
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if (
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node.type === 'Rule' &&
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node.prelude.type === 'SelectorList' &&
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node.prelude.children.isEmpty()
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) {
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list.remove(item);
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}
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},
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});
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if (style.cssAst.children.isEmpty()) {
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// remove emtpy style element
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detachNodeFromParent(style.node, style.parentNode);
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} else {
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// update style element if any styles left
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const firstChild = style.node.children[0];
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if (firstChild.type === 'text' || firstChild.type === 'cdata') {
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firstChild.value = csstree.generate(style.cssAst);
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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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