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es
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isexe
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.package-lock.json
src
LICENSE
package-lock.json
package.json
readme.md
webpack.config.js
421 lines
16 KiB
JavaScript
421 lines
16 KiB
JavaScript
![]() |
import { SelectorType, AttributeAction, } from "./types";
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const reName = /^[^\\#]?(?:\\(?:[\da-f]{1,6}\s?|.)|[\w\-\u00b0-\uFFFF])+/;
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const reEscape = /\\([\da-f]{1,6}\s?|(\s)|.)/gi;
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const actionTypes = new Map([
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[126 /* Tilde */, AttributeAction.Element],
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[94 /* Circumflex */, AttributeAction.Start],
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[36 /* Dollar */, AttributeAction.End],
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[42 /* Asterisk */, AttributeAction.Any],
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[33 /* ExclamationMark */, AttributeAction.Not],
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[124 /* Pipe */, AttributeAction.Hyphen],
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]);
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// Pseudos, whose data property is parsed as well.
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const unpackPseudos = new Set([
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"has",
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"not",
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"matches",
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"is",
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"where",
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"host",
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"host-context",
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]);
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/**
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* Checks whether a specific selector is a traversal.
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* This is useful eg. in swapping the order of elements that
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* are not traversals.
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*
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* @param selector Selector to check.
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*/
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export function isTraversal(selector) {
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switch (selector.type) {
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case SelectorType.Adjacent:
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case SelectorType.Child:
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case SelectorType.Descendant:
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case SelectorType.Parent:
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case SelectorType.Sibling:
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case SelectorType.ColumnCombinator:
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return true;
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default:
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return false;
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}
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}
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const stripQuotesFromPseudos = new Set(["contains", "icontains"]);
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// Unescape function taken from https://github.com/jquery/sizzle/blob/master/src/sizzle.js#L152
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function funescape(_, escaped, escapedWhitespace) {
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const high = parseInt(escaped, 16) - 0x10000;
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// NaN means non-codepoint
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return high !== high || escapedWhitespace
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? escaped
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: high < 0
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? // BMP codepoint
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String.fromCharCode(high + 0x10000)
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: // Supplemental Plane codepoint (surrogate pair)
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String.fromCharCode((high >> 10) | 0xd800, (high & 0x3ff) | 0xdc00);
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}
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function unescapeCSS(str) {
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return str.replace(reEscape, funescape);
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}
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function isQuote(c) {
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return c === 39 /* SingleQuote */ || c === 34 /* DoubleQuote */;
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}
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function isWhitespace(c) {
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return (c === 32 /* Space */ ||
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c === 9 /* Tab */ ||
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c === 10 /* NewLine */ ||
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c === 12 /* FormFeed */ ||
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c === 13 /* CarriageReturn */);
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}
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/**
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* Parses `selector`, optionally with the passed `options`.
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*
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* @param selector Selector to parse.
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* @param options Options for parsing.
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* @returns Returns a two-dimensional array.
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* The first dimension represents selectors separated by commas (eg. `sub1, sub2`),
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* the second contains the relevant tokens for that selector.
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*/
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export function parse(selector) {
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const subselects = [];
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const endIndex = parseSelector(subselects, `${selector}`, 0);
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if (endIndex < selector.length) {
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throw new Error(`Unmatched selector: ${selector.slice(endIndex)}`);
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}
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return subselects;
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}
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function parseSelector(subselects, selector, selectorIndex) {
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let tokens = [];
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function getName(offset) {
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const match = selector.slice(selectorIndex + offset).match(reName);
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if (!match) {
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throw new Error(`Expected name, found ${selector.slice(selectorIndex)}`);
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}
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const [name] = match;
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selectorIndex += offset + name.length;
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return unescapeCSS(name);
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}
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function stripWhitespace(offset) {
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selectorIndex += offset;
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while (selectorIndex < selector.length &&
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isWhitespace(selector.charCodeAt(selectorIndex))) {
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selectorIndex++;
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}
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}
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function readValueWithParenthesis() {
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selectorIndex += 1;
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const start = selectorIndex;
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let counter = 1;
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for (; counter > 0 && selectorIndex < selector.length; selectorIndex++) {
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if (selector.charCodeAt(selectorIndex) ===
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40 /* LeftParenthesis */ &&
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!isEscaped(selectorIndex)) {
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counter++;
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}
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else if (selector.charCodeAt(selectorIndex) ===
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41 /* RightParenthesis */ &&
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!isEscaped(selectorIndex)) {
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counter--;
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}
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}
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if (counter) {
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throw new Error("Parenthesis not matched");
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}
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return unescapeCSS(selector.slice(start, selectorIndex - 1));
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}
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function isEscaped(pos) {
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let slashCount = 0;
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while (selector.charCodeAt(--pos) === 92 /* BackSlash */)
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slashCount++;
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return (slashCount & 1) === 1;
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}
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function ensureNotTraversal() {
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if (tokens.length > 0 && isTraversal(tokens[tokens.length - 1])) {
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throw new Error("Did not expect successive traversals.");
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}
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}
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function addTraversal(type) {
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if (tokens.length > 0 &&
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tokens[tokens.length - 1].type === SelectorType.Descendant) {
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tokens[tokens.length - 1].type = type;
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return;
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}
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ensureNotTraversal();
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tokens.push({ type });
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}
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function addSpecialAttribute(name, action) {
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tokens.push({
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type: SelectorType.Attribute,
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name,
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action,
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value: getName(1),
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namespace: null,
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ignoreCase: "quirks",
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});
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}
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/**
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* We have finished parsing the current part of the selector.
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*
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* Remove descendant tokens at the end if they exist,
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* and return the last index, so that parsing can be
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* picked up from here.
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*/
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function finalizeSubselector() {
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if (tokens.length &&
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tokens[tokens.length - 1].type === SelectorType.Descendant) {
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tokens.pop();
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}
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if (tokens.length === 0) {
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throw new Error("Empty sub-selector");
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}
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subselects.push(tokens);
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}
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stripWhitespace(0);
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if (selector.length === selectorIndex) {
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return selectorIndex;
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}
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loop: while (selectorIndex < selector.length) {
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const firstChar = selector.charCodeAt(selectorIndex);
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switch (firstChar) {
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// Whitespace
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case 32 /* Space */:
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case 9 /* Tab */:
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case 10 /* NewLine */:
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case 12 /* FormFeed */:
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case 13 /* CarriageReturn */: {
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if (tokens.length === 0 ||
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tokens[0].type !== SelectorType.Descendant) {
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ensureNotTraversal();
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tokens.push({ type: SelectorType.Descendant });
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}
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stripWhitespace(1);
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break;
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}
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// Traversals
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case 62 /* GreaterThan */: {
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addTraversal(SelectorType.Child);
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stripWhitespace(1);
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break;
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}
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case 60 /* LessThan */: {
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addTraversal(SelectorType.Parent);
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stripWhitespace(1);
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break;
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}
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case 126 /* Tilde */: {
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addTraversal(SelectorType.Sibling);
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stripWhitespace(1);
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break;
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}
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case 43 /* Plus */: {
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addTraversal(SelectorType.Adjacent);
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stripWhitespace(1);
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break;
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}
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// Special attribute selectors: .class, #id
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case 46 /* Period */: {
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addSpecialAttribute("class", AttributeAction.Element);
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break;
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}
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case 35 /* Hash */: {
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addSpecialAttribute("id", AttributeAction.Equals);
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break;
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}
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case 91 /* LeftSquareBracket */: {
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stripWhitespace(1);
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// Determine attribute name and namespace
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let name;
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let namespace = null;
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if (selector.charCodeAt(selectorIndex) === 124 /* Pipe */) {
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// Equivalent to no namespace
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name = getName(1);
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}
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else if (selector.startsWith("*|", selectorIndex)) {
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namespace = "*";
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name = getName(2);
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}
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else {
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name = getName(0);
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if (selector.charCodeAt(selectorIndex) === 124 /* Pipe */ &&
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selector.charCodeAt(selectorIndex + 1) !==
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61 /* Equal */) {
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namespace = name;
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name = getName(1);
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}
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}
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stripWhitespace(0);
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// Determine comparison operation
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let action = AttributeAction.Exists;
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const possibleAction = actionTypes.get(selector.charCodeAt(selectorIndex));
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if (possibleAction) {
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action = possibleAction;
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if (selector.charCodeAt(selectorIndex + 1) !==
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61 /* Equal */) {
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throw new Error("Expected `=`");
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}
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stripWhitespace(2);
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}
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else if (selector.charCodeAt(selectorIndex) === 61 /* Equal */) {
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action = AttributeAction.Equals;
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stripWhitespace(1);
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}
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// Determine value
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let value = "";
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let ignoreCase = null;
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if (action !== "exists") {
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if (isQuote(selector.charCodeAt(selectorIndex))) {
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const quote = selector.charCodeAt(selectorIndex);
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let sectionEnd = selectorIndex + 1;
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while (sectionEnd < selector.length &&
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(selector.charCodeAt(sectionEnd) !== quote ||
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isEscaped(sectionEnd))) {
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sectionEnd += 1;
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}
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if (selector.charCodeAt(sectionEnd) !== quote) {
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throw new Error("Attribute value didn't end");
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}
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value = unescapeCSS(selector.slice(selectorIndex + 1, sectionEnd));
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selectorIndex = sectionEnd + 1;
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}
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else {
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const valueStart = selectorIndex;
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|
while (selectorIndex < selector.length &&
|
||
|
((!isWhitespace(selector.charCodeAt(selectorIndex)) &&
|
||
|
selector.charCodeAt(selectorIndex) !==
|
||
|
93 /* RightSquareBracket */) ||
|
||
|
isEscaped(selectorIndex))) {
|
||
|
selectorIndex += 1;
|
||
|
}
|
||
|
value = unescapeCSS(selector.slice(valueStart, selectorIndex));
|
||
|
}
|
||
|
stripWhitespace(0);
|
||
|
// See if we have a force ignore flag
|
||
|
const forceIgnore = selector.charCodeAt(selectorIndex) | 0x20;
|
||
|
// If the forceIgnore flag is set (either `i` or `s`), use that value
|
||
|
if (forceIgnore === 115 /* LowerS */) {
|
||
|
ignoreCase = false;
|
||
|
stripWhitespace(1);
|
||
|
}
|
||
|
else if (forceIgnore === 105 /* LowerI */) {
|
||
|
ignoreCase = true;
|
||
|
stripWhitespace(1);
|
||
|
}
|
||
|
}
|
||
|
if (selector.charCodeAt(selectorIndex) !==
|
||
|
93 /* RightSquareBracket */) {
|
||
|
throw new Error("Attribute selector didn't terminate");
|
||
|
}
|
||
|
selectorIndex += 1;
|
||
|
const attributeSelector = {
|
||
|
type: SelectorType.Attribute,
|
||
|
name,
|
||
|
action,
|
||
|
value,
|
||
|
namespace,
|
||
|
ignoreCase,
|
||
|
};
|
||
|
tokens.push(attributeSelector);
|
||
|
break;
|
||
|
}
|
||
|
case 58 /* Colon */: {
|
||
|
if (selector.charCodeAt(selectorIndex + 1) === 58 /* Colon */) {
|
||
|
tokens.push({
|
||
|
type: SelectorType.PseudoElement,
|
||
|
name: getName(2).toLowerCase(),
|
||
|
data: selector.charCodeAt(selectorIndex) ===
|
||
|
40 /* LeftParenthesis */
|
||
|
? readValueWithParenthesis()
|
||
|
: null,
|
||
|
});
|
||
|
continue;
|
||
|
}
|
||
|
const name = getName(1).toLowerCase();
|
||
|
let data = null;
|
||
|
if (selector.charCodeAt(selectorIndex) ===
|
||
|
40 /* LeftParenthesis */) {
|
||
|
if (unpackPseudos.has(name)) {
|
||
|
if (isQuote(selector.charCodeAt(selectorIndex + 1))) {
|
||
|
throw new Error(`Pseudo-selector ${name} cannot be quoted`);
|
||
|
}
|
||
|
data = [];
|
||
|
selectorIndex = parseSelector(data, selector, selectorIndex + 1);
|
||
|
if (selector.charCodeAt(selectorIndex) !==
|
||
|
41 /* RightParenthesis */) {
|
||
|
throw new Error(`Missing closing parenthesis in :${name} (${selector})`);
|
||
|
}
|
||
|
selectorIndex += 1;
|
||
|
}
|
||
|
else {
|
||
|
data = readValueWithParenthesis();
|
||
|
if (stripQuotesFromPseudos.has(name)) {
|
||
|
const quot = data.charCodeAt(0);
|
||
|
if (quot === data.charCodeAt(data.length - 1) &&
|
||
|
isQuote(quot)) {
|
||
|
data = data.slice(1, -1);
|
||
|
}
|
||
|
}
|
||
|
data = unescapeCSS(data);
|
||
|
}
|
||
|
}
|
||
|
tokens.push({ type: SelectorType.Pseudo, name, data });
|
||
|
break;
|
||
|
}
|
||
|
case 44 /* Comma */: {
|
||
|
finalizeSubselector();
|
||
|
tokens = [];
|
||
|
stripWhitespace(1);
|
||
|
break;
|
||
|
}
|
||
|
default: {
|
||
|
if (selector.startsWith("/*", selectorIndex)) {
|
||
|
const endIndex = selector.indexOf("*/", selectorIndex + 2);
|
||
|
if (endIndex < 0) {
|
||
|
throw new Error("Comment was not terminated");
|
||
|
}
|
||
|
selectorIndex = endIndex + 2;
|
||
|
// Remove leading whitespace
|
||
|
if (tokens.length === 0) {
|
||
|
stripWhitespace(0);
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
let namespace = null;
|
||
|
let name;
|
||
|
if (firstChar === 42 /* Asterisk */) {
|
||
|
selectorIndex += 1;
|
||
|
name = "*";
|
||
|
}
|
||
|
else if (firstChar === 124 /* Pipe */) {
|
||
|
name = "";
|
||
|
if (selector.charCodeAt(selectorIndex + 1) === 124 /* Pipe */) {
|
||
|
addTraversal(SelectorType.ColumnCombinator);
|
||
|
stripWhitespace(2);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
else if (reName.test(selector.slice(selectorIndex))) {
|
||
|
name = getName(0);
|
||
|
}
|
||
|
else {
|
||
|
break loop;
|
||
|
}
|
||
|
if (selector.charCodeAt(selectorIndex) === 124 /* Pipe */ &&
|
||
|
selector.charCodeAt(selectorIndex + 1) !== 124 /* Pipe */) {
|
||
|
namespace = name;
|
||
|
if (selector.charCodeAt(selectorIndex + 1) ===
|
||
|
42 /* Asterisk */) {
|
||
|
name = "*";
|
||
|
selectorIndex += 2;
|
||
|
}
|
||
|
else {
|
||
|
name = getName(1);
|
||
|
}
|
||
|
}
|
||
|
tokens.push(name === "*"
|
||
|
? { type: SelectorType.Universal, namespace }
|
||
|
: { type: SelectorType.Tag, name, namespace });
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
finalizeSubselector();
|
||
|
return selectorIndex;
|
||
|
}
|