compile.js
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import { parse, SelectorType } from "css-what";
import boolbase from "boolbase";
import sortRules, { isTraversal } from "./sort.js";
import { compileGeneralSelector } from "./general.js";
import { ensureIsTag, PLACEHOLDER_ELEMENT, } from "./pseudo-selectors/subselects.js";
/**
* Compiles a selector to an executable function.
*
* @param selector Selector to compile.
* @param options Compilation options.
* @param context Optional context for the selector.
*/
export function compile(selector, options, context) {
const next = compileUnsafe(selector, options, context);
return ensureIsTag(next, options.adapter);
}
export function compileUnsafe(selector, options, context) {
const token = typeof selector === "string" ? parse(selector) : selector;
return compileToken(token, options, context);
}
function includesScopePseudo(t) {
return (t.type === SelectorType.Pseudo &&
(t.name === "scope" ||
(Array.isArray(t.data) &&
t.data.some((data) => data.some(includesScopePseudo)))));
}
const DESCENDANT_TOKEN = { type: SelectorType.Descendant };
const FLEXIBLE_DESCENDANT_TOKEN = {
type: "_flexibleDescendant",
};
const SCOPE_TOKEN = {
type: SelectorType.Pseudo,
name: "scope",
data: null,
};
/*
* CSS 4 Spec (Draft): 3.4.1. Absolutizing a Relative Selector
* http://www.w3.org/TR/selectors4/#absolutizing
*/
function absolutize(token, { adapter }, context) {
// TODO Use better check if the context is a document
const hasContext = !!(context === null || context === void 0 ? void 0 : context.every((e) => {
const parent = adapter.isTag(e) && adapter.getParent(e);
return e === PLACEHOLDER_ELEMENT || (parent && adapter.isTag(parent));
}));
for (const t of token) {
if (t.length > 0 &&
isTraversal(t[0]) &&
t[0].type !== SelectorType.Descendant) {
// Don't continue in else branch
}
else if (hasContext && !t.some(includesScopePseudo)) {
t.unshift(DESCENDANT_TOKEN);
}
else {
continue;
}
t.unshift(SCOPE_TOKEN);
}
}
export function compileToken(token, options, context) {
var _a;
token.forEach(sortRules);
context = (_a = options.context) !== null && _a !== void 0 ? _a : context;
const isArrayContext = Array.isArray(context);
const finalContext = context && (Array.isArray(context) ? context : [context]);
// Check if the selector is relative
if (options.relativeSelector !== false) {
absolutize(token, options, finalContext);
}
else if (token.some((t) => t.length > 0 && isTraversal(t[0]))) {
throw new Error("Relative selectors are not allowed when the `relativeSelector` option is disabled");
}
let shouldTestNextSiblings = false;
const query = token
.map((rules) => {
if (rules.length >= 2) {
const [first, second] = rules;
if (first.type !== SelectorType.Pseudo ||
first.name !== "scope") {
// Ignore
}
else if (isArrayContext &&
second.type === SelectorType.Descendant) {
rules[1] = FLEXIBLE_DESCENDANT_TOKEN;
}
else if (second.type === SelectorType.Adjacent ||
second.type === SelectorType.Sibling) {
shouldTestNextSiblings = true;
}
}
return compileRules(rules, options, finalContext);
})
.reduce(reduceRules, boolbase.falseFunc);
query.shouldTestNextSiblings = shouldTestNextSiblings;
return query;
}
function compileRules(rules, options, context) {
var _a;
return rules.reduce((previous, rule) => previous === boolbase.falseFunc
? boolbase.falseFunc
: compileGeneralSelector(previous, rule, options, context, compileToken), (_a = options.rootFunc) !== null && _a !== void 0 ? _a : boolbase.trueFunc);
}
function reduceRules(a, b) {
if (b === boolbase.falseFunc || a === boolbase.trueFunc) {
return a;
}
if (a === boolbase.falseFunc || b === boolbase.trueFunc) {
return b;
}
return function combine(elem) {
return a(elem) || b(elem);
};
}
//# sourceMappingURL=compile.js.map