puppeteer-core
Version:
A high-level API to control headless Chrome over the DevTools Protocol
87 lines • 3.12 kB
JavaScript
/**
* @license
* Copyright 2023 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import { tokenize, TOKENS, stringify } from 'parsel-js';
TOKENS['combinator'] = /\s*(>>>>?|[\s>+~])\s*/g;
const ESCAPE_REGEXP = /\\[\s\S]/g;
const unquote = (text) => {
if (text.length <= 1) {
return text;
}
if ((text[0] === '"' || text[0] === "'") && text.endsWith(text[0])) {
text = text.slice(1, -1);
}
return text.replace(ESCAPE_REGEXP, match => {
return match[1];
});
};
export function parsePSelectors(selector) {
let isPureCSS = true;
const tokens = tokenize(selector);
if (tokens.length === 0) {
return [[], isPureCSS];
}
let compoundSelector = [];
let complexSelector = [compoundSelector];
const selectors = [complexSelector];
const storage = [];
for (const token of tokens) {
switch (token.type) {
case 'combinator':
switch (token.content) {
case ">>>" /* PCombinator.Descendent */:
isPureCSS = false;
if (storage.length) {
compoundSelector.push(stringify(storage));
storage.splice(0);
}
compoundSelector = [];
complexSelector.push(">>>" /* PCombinator.Descendent */);
complexSelector.push(compoundSelector);
continue;
case ">>>>" /* PCombinator.Child */:
isPureCSS = false;
if (storage.length) {
compoundSelector.push(stringify(storage));
storage.splice(0);
}
compoundSelector = [];
complexSelector.push(">>>>" /* PCombinator.Child */);
complexSelector.push(compoundSelector);
continue;
}
break;
case 'pseudo-element':
if (!token.name.startsWith('-p-')) {
break;
}
isPureCSS = false;
if (storage.length) {
compoundSelector.push(stringify(storage));
storage.splice(0);
}
compoundSelector.push({
name: token.name.slice(3),
value: unquote(token.argument ?? ''),
});
continue;
case 'comma':
if (storage.length) {
compoundSelector.push(stringify(storage));
storage.splice(0);
}
compoundSelector = [];
complexSelector = [compoundSelector];
selectors.push(complexSelector);
continue;
}
storage.push(token);
}
if (storage.length) {
compoundSelector.push(stringify(storage));
}
return [selectors, isPureCSS];
}
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