96 lines
3.4 KiB
JavaScript
96 lines
3.4 KiB
JavaScript
/**
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* CSS limits the characters considered as whitespace to space, tab & line
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* feed. We add carriage returns as htmlparser2 doesn't normalize them to
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* line feeds.
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*
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* @see {@link https://www.w3.org/TR/css-text-3/#white-space}
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*/
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const isDocumentWhiteSpace = /^[ \t\r\n]*$/;
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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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const children = adapter.getChildren(elem);
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return (
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// First, make sure the tag does not have any element children.
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children.every((elem) => !adapter.isTag(elem)) &&
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// Then, check that the text content is only whitespace.
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children.every((elem) =>
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// FIXME: `getText` call is potentially expensive.
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isDocumentWhiteSpace.test(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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}
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if (adapter.isTag(siblings[i])) {
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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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"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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}
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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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}
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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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