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79 lines
2.8 KiB
79 lines
2.8 KiB
2 years ago
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// While filters are precompiled, pseudos get called when they are needed
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export const pseudos = {
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empty(elem, { adapter }) {
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return !adapter.getChildren(elem).some((elem) =>
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// FIXME: `getText` call is potentially expensive.
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adapter.isTag(elem) || adapter.getText(elem) !== "");
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},
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"first-child"(elem, { adapter, equals }) {
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if (adapter.prevElementSibling) {
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return adapter.prevElementSibling(elem) == null;
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}
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const firstChild = adapter
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.getSiblings(elem)
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.find((elem) => adapter.isTag(elem));
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return firstChild != null && equals(elem, firstChild);
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},
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"last-child"(elem, { adapter, equals }) {
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const siblings = adapter.getSiblings(elem);
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for (let i = siblings.length - 1; i >= 0; i--) {
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if (equals(elem, siblings[i]))
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return true;
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if (adapter.isTag(siblings[i]))
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break;
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}
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return false;
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},
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"first-of-type"(elem, { adapter, equals }) {
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const siblings = adapter.getSiblings(elem);
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const elemName = adapter.getName(elem);
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for (let i = 0; i < siblings.length; i++) {
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const currentSibling = siblings[i];
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if (equals(elem, currentSibling))
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return true;
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if (adapter.isTag(currentSibling) &&
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adapter.getName(currentSibling) === elemName) {
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break;
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}
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}
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return false;
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},
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"last-of-type"(elem, { adapter, equals }) {
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const siblings = adapter.getSiblings(elem);
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const elemName = adapter.getName(elem);
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for (let i = siblings.length - 1; i >= 0; i--) {
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const currentSibling = siblings[i];
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if (equals(elem, currentSibling))
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return true;
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if (adapter.isTag(currentSibling) &&
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adapter.getName(currentSibling) === elemName) {
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break;
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}
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}
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return false;
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},
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"only-of-type"(elem, { adapter, equals }) {
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const elemName = adapter.getName(elem);
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return adapter
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.getSiblings(elem)
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.every((sibling) => equals(elem, sibling) ||
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!adapter.isTag(sibling) ||
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adapter.getName(sibling) !== elemName);
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},
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"only-child"(elem, { adapter, equals }) {
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return adapter
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.getSiblings(elem)
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.every((sibling) => equals(elem, sibling) || !adapter.isTag(sibling));
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},
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};
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export function verifyPseudoArgs(func, name, subselect, argIndex) {
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if (subselect === null) {
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if (func.length > argIndex) {
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throw new Error(`Pseudo-class :${name} requires an argument`);
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}
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}
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else if (func.length === argIndex) {
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throw new Error(`Pseudo-class :${name} doesn't have any arguments`);
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}
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}
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//# sourceMappingURL=pseudos.js.map
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