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refactor: optimize style element inlining

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Mikael Sand
2019-10-20 20:41:57 +03:00
parent 8c9de72bda
commit ee4b0d51f1
1 changed files with 23 additions and 29 deletions
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src/css.js
+23 -29
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@@ -321,7 +321,7 @@ function CSSStyleDeclaration(node) {
*/
function setProperty({ properties, style }, name, value, important) {
if (typeof name === 'undefined') {
throw Error('propertyName argument required, but only not present.');
throw Error('propertyName argument required, but not present.');
}
const v = value.trim();
const key = name.trim();
@@ -426,36 +426,30 @@ export function inlineStyles(document) {
// match selectors
for (let selector of sortedSelectors) {
if (selector.rule === null) {
continue;
}
const selectorStr = csstree.generate(selector.item.data);
try {
const selected = querySelectorAll(document, selectorStr);
if (selected.length) {
// apply <style/> to matched elements
for (let element of selected) {
if (selector.rule === null) {
continue;
}
initStyle(element);
const { style } = element;
const { properties } = style;
// merge declarations
csstree.walk(selector.rule, {
visit: 'Declaration',
enter({ property, value, important }) {
// existing inline styles have higher priority
// no inline styles, external styles, external styles used
// inline styles, external styles same priority as inline styles, inline styles used
// inline styles, external styles higher priority than inline styles, external styles used
const prop = properties.get(property.trim());
if (prop && prop.important >= important) {
return;
}
setProperty(style, property, csstree.generate(value), important);
},
});
}
// apply <style/> to matched elements
for (let element of querySelectorAll(document, selectorStr)) {
initStyle(element);
const { style } = element;
const { properties } = style;
csstree.walk(selector.rule, {
visit: 'Declaration',
enter({ property, value, important }) {
// existing inline styles have higher priority
// no inline styles, external styles, external styles used
// inline styles, external styles same priority as inline styles, inline styles used
// inline styles, external styles higher priority than inline styles, external styles used
const prop = properties.get(property.trim());
if (prop && prop.important >= important) {
return;
}
setProperty(style, property, csstree.generate(value), important);
},
});
}
} catch (selectError) {
if (selectError.constructor === SyntaxError) {