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'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`.
*/
module.exports = function() {
const contextMap = new Map();
return {
/**
* @param {import('postcss').Node} node
*/
getContext(node, /** @type {any[]} */ ...subContexts) {
// TODO TYPES node.source possible undefined
const nodeSource = /** @type {import('postcss').NodeSource} */ (node.source).input.from;
const baseContext = creativeGetMap(contextMap, nodeSource);
return subContexts.reduce((result, context) => {
return creativeGetMap(result, context);
}, baseContext);
},
};
};
/**
* TODO TYPES
* @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);
}
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