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node_modules/stylelint/lib/utils/nodeContextLookup.cjs

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+// NOTICE: This file is generated by Rollup. To modify it,
+// please instead edit the ESM counterpart and rebuild with Rollup (npm run build).
+'use strict';
+
+/**
+ * Create a collection of Maps that serve to contextualize a given node.
+ * This is useful to ensure that you only compare nodes that share a certain
+ * context.
+ *
+ * All nodes are initially contextualized by their input source.
+ * From there, you can contextualize them however you want.
+ *
+ * For a usage example, see `selector-no-descending-specificity`.
+ */
+function nodeContextLookup() {
+	const contextMap = new Map();
+
+	return {
+		/**
+		 * @param {import('postcss').Node} node
+		 * @param {any[]} subContexts
+		 * @returns {Map<any, any>}
+		 */
+		getContext(node, ...subContexts) {
+			if (!node.source) throw new Error('The node source must be present');
+
+			const nodeSource = node.source.input.from;
+			const baseContext = creativeGetMap(contextMap, nodeSource);
+
+			return subContexts.reduce((result, context) => creativeGetMap(result, context), baseContext);
+		},
+	};
+}
+
+/**
+ * @param {Map<any, any>} someMap
+ * @param {any} someThing
+ */
+function creativeGetMap(someMap, someThing) {
+	if (!someMap.has(someThing)) {
+		someMap.set(someThing, new Map());
+	}
+
+	return someMap.get(someThing);
+}
+
+module.exports = nodeContextLookup;