53 lines
2.2 KiB
JavaScript
53 lines
2.2 KiB
JavaScript
/*
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* Pseudo selectors
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*
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* Pseudo selectors are available in three forms:
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*
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* 1. Filters are called when the selector is compiled and return a function
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* that has to return either false, or the results of `next()`.
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* 2. Pseudos are called on execution. They have to return a boolean.
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* 3. Subselects work like filters, but have an embedded selector that will be run separately.
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*
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* Filters are great if you want to do some pre-processing, or change the call order
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* of `next()` and your code.
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* Pseudos should be used to implement simple checks.
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*/
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import { parse } from "css-what";
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import { aliases } from "./aliases.js";
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import { filters } from "./filters.js";
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import { pseudos, verifyPseudoArgs } from "./pseudos.js";
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import { subselects } from "./subselects.js";
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export { filters, pseudos, aliases };
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export function compilePseudoSelector(next, selector, options, context, compileToken) {
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const { name, data } = selector;
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if (Array.isArray(data)) {
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if (!(name in subselects)) {
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throw new Error(`Unknown pseudo-class :${name}(${data})`);
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}
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return subselects[name](next, data, options, context, compileToken);
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}
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const userPseudo = options.pseudos?.[name];
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const stringPseudo = typeof userPseudo === "string" ? userPseudo : aliases[name];
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if (typeof stringPseudo === "string") {
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if (data != null) {
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throw new Error(`Pseudo ${name} doesn't have any arguments`);
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}
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// The alias has to be parsed here, to make sure options are respected.
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const alias = parse(stringPseudo);
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return subselects["is"](next, alias, options, context, compileToken);
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}
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if (typeof userPseudo === "function") {
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verifyPseudoArgs(userPseudo, name, data, 1);
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return (elem) => userPseudo(elem, data) && next(elem);
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}
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if (name in filters) {
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return filters[name](next, data, options, context);
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}
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if (name in pseudos) {
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const pseudo = pseudos[name];
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verifyPseudoArgs(pseudo, name, data, 2);
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return (elem) => pseudo(elem, options, data) && next(elem);
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}
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throw new Error(`Unknown pseudo-class :${name}`);
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}
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//# sourceMappingURL=index.js.map
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