85 lines
1.6 KiB
JavaScript
85 lines
1.6 KiB
JavaScript
'use strict';
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const { isComment, isDocument, isRoot, hasSource } = require('./typeGuards');
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/**
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* @param {import('postcss').Node} statement
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* @returns {boolean}
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*/
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module.exports = function isFirstNested(statement) {
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const parentNode = statement.parent;
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if (parentNode === undefined) {
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return false;
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}
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if (isRoot(parentNode) && !isInDocument(parentNode)) {
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return false;
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}
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if (statement === parentNode.first) {
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return true;
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}
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/*
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* Search for the statement in the parent's nodes, ignoring comment
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* nodes on the same line as the parent's opening brace.
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*/
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const parentNodes = parentNode.nodes;
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if (!parentNodes) {
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return false;
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}
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const firstNode = parentNodes[0];
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if (!firstNode) {
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return false;
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}
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if (
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!isComment(firstNode) ||
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(typeof firstNode.raws.before === 'string' && firstNode.raws.before.includes('\n'))
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) {
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return false;
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}
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if (!hasSource(firstNode) || !firstNode.source.start) {
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return false;
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}
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const openingBraceLine = firstNode.source.start.line;
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if (!firstNode.source.end || openingBraceLine !== firstNode.source.end.line) {
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return false;
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}
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for (const [index, node] of parentNodes.entries()) {
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if (index === 0) {
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continue;
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}
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if (node === statement) {
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return true;
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}
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if (
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!isComment(node) ||
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(hasSource(node) && node.source.end && node.source.end.line !== openingBraceLine)
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) {
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return false;
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}
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}
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/* istanbul ignore next: Should always return in the loop */
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return false;
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};
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/**
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* @param {import('postcss').Node} node
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* @returns {boolean}
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*/
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function isInDocument({ parent }) {
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return Boolean(parent && isDocument(parent));
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}
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