'use strict';
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exports.type = 'full';
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exports.active = true;
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exports.params = {
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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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};
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exports.description = 'inline styles (additional options)';
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var csstree = require('css-tree'),
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cssTools = require('../lib/css-tools');
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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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* @param {Object} document document element
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* @param {Object} opts plugin params
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*
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* @author strarsis <strarsis@gmail.com>
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*/
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exports.fn = function(document, opts) {
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// collect <style/>s
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var styleEls = document.querySelectorAll('style');
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//no <styles/>s, nothing to do
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if (styleEls === null) {
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return document;
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}
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var styles = [],
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selectors = [];
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for (var styleEl of styleEls) {
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if (styleEl.isEmpty() || styleEl.closestElem('foreignObject')) {
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// skip empty <style/>s or <foreignObject> content.
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continue;
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}
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var cssStr = cssTools.getCssStr(styleEl);
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// collect <style/>s and their css ast
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var cssAst = {};
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try {
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cssAst = csstree.parse(cssStr, {
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parseValue: false,
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parseCustomProperty: false
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});
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} catch (parseError) {
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// console.warn('Warning: Parse error of styles of <style/> element, skipped. Error details: ' + parseError);
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continue;
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}
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styles.push({
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styleEl: styleEl,
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cssAst: cssAst
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});
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selectors = selectors.concat(cssTools.flattenToSelectors(cssAst));
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}
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// filter for mediaqueries to be used or without any mediaquery
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var selectorsMq = cssTools.filterByMqs(selectors, opts.useMqs);
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// filter for pseudo elements to be used
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var selectorsPseudo = cssTools.filterByPseudos(selectorsMq, opts.usePseudos);
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// remove PseudoClass from its SimpleSelector for proper matching
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cssTools.cleanPseudos(selectorsPseudo);
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// stable sort selectors
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var sortedSelectors = cssTools.sortSelectors(selectorsPseudo).reverse();
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var selector,
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selectedEl;
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// match selectors
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for (selector of sortedSelectors) {
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var selectorStr = csstree.generate(selector.item.data),
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selectedEls = null;
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try {
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selectedEls = document.querySelectorAll(selectorStr);
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} catch (selectError) {
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if (selectError.constructor === SyntaxError) {
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// console.warn('Warning: Syntax error when trying to select \n\n' + selectorStr + '\n\n, skipped. Error details: ' + selectError);
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continue;
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}
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throw selectError;
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}
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if (selectedEls === null) {
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// nothing selected
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continue;
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}
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selector.selectedEls = selectedEls;
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}
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// apply <style/> styles to matched elements
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for (selector of sortedSelectors) {
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if(!selector.selectedEls) {
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continue;
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}
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if (opts.onlyMatchedOnce && selector.selectedEls !== null && selector.selectedEls.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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// apply <style/> to matched elements
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for (selectedEl of selector.selectedEls) {
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if (selector.rule === null) {
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continue;
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}
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// merge declarations
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csstree.walk(selector.rule, {visit: 'Declaration', enter: function(styleCsstreeDeclaration) {
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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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var styleDeclaration = cssTools.csstreeToStyleDeclaration(styleCsstreeDeclaration);
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if (selectedEl.style.getPropertyValue(styleDeclaration.name) !== null &&
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selectedEl.style.getPropertyPriority(styleDeclaration.name) >= styleDeclaration.priority) {
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return;
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}
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selectedEl.style.setProperty(styleDeclaration.name, styleDeclaration.value, styleDeclaration.priority);
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}});
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}
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if (opts.removeMatchedSelectors && selector.selectedEls !== null && selector.selectedEls.length > 0) {
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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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}
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if (!opts.removeMatchedSelectors) {
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return document; // no further processing required
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}
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// clean up matched class + ID attribute values
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for (selector of sortedSelectors) {
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if(!selector.selectedEls) {
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continue;
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}
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if (opts.onlyMatchedOnce && selector.selectedEls !== null && selector.selectedEls.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 (selectedEl of selector.selectedEls) {
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// class
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var firstSubSelector = selector.item.data.children.first();
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if(firstSubSelector.type === 'ClassSelector') {
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selectedEl.class.remove(firstSubSelector.name);
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}
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// clean up now empty class attributes
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if(typeof selectedEl.class.item(0) === 'undefined') {
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selectedEl.removeAttr('class');
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}
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// ID
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if(firstSubSelector.type === 'IdSelector') {
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selectedEl.removeAttr('id', firstSubSelector.name);
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}
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}
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}
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// clean up now empty elements
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for (var style of styles) {
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csstree.walk(style.cssAst, {visit: 'Rule', enter: function(node, item, list) {
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// clean up <style/> atrules without any rulesets left
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if (node.type === 'Atrule' &&
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// only Atrules containing rulesets
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node.block !== null &&
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node.block.children.isEmpty()) {
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list.remove(item);
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return;
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}
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// clean up <style/> rulesets without any css selectors left
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if (node.type === 'Rule' &&
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node.prelude.children.isEmpty()) {
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list.remove(item);
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}
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}});
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if (style.cssAst.children.isEmpty()) {
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// clean up now emtpy <style/>s
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var styleParentEl = style.styleEl.parentNode;
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styleParentEl.spliceContent(styleParentEl.content.indexOf(style.styleEl), 1);
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if (styleParentEl.elem === 'defs' &&
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styleParentEl.content.length === 0) {
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// also clean up now empty <def/>s
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var defsParentEl = styleParentEl.parentNode;
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defsParentEl.spliceContent(defsParentEl.content.indexOf(styleParentEl), 1);
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}
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continue;
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}
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// update existing, left over <style>s
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cssTools.setCssStr(style.styleEl, csstree.generate(style.cssAst));
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}
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return document;
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};
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