match - Add css match functions with basic test cases

src/index.ts

@@ -4,6 +4,7 @@ import {
   findNodeByComponentRef,
   findNodeByComponentName
 } from "./findNode";
+import { matchGenerator, matchAll, matchFirst } from "./match";
 import * as Utils from "./utils";
 
 export {
@@ -12,5 +13,8 @@ export {
   findNodeByComponent,
   findNodeByComponentRef,
   findNodeByComponentName,
+  matchGenerator,
+  matchAll,
+  matchFirst,
   Utils
 };

src/match.ts

@@ -1,20 +1,22 @@
-import CSSwhat from "css-what";
+import * as CSSWhat from "css-what";
 import { traverseGenerator } from "./traverse";
 import { FiberNode } from "./mocked-types";
 import { isNodeNotHtmlLike } from "./utils";
 
 function* matchGenerator(
   node: FiberNode,
-  match: string | CSSwhat.Selector[][]
+  match: string | CSSWhat.Selector[][]
 ): IterableIterator<FiberNode> {
   // Either parse match string or allow parsed match object as it is
-  let matchParsed: CSSwhat.Selector[][];
+  let matchParsed: CSSWhat.Selector[][];
   if (typeof match === "string") {
-    matchParsed = CSSwhat.parse(match);
+    matchParsed = CSSWhat.parse(match, {
+      lowerCaseTags: false,
+      lowerCaseAttributeNames: false
+    });
   } else {
     matchParsed = match;
   }
-
   // If selector is a combination of multiple basic selectors (a, b),
   // pass them separately to matchGenerator and combine their results one after another
   const selectorsCount = matchParsed.length;
@@ -35,20 +37,46 @@ function* matchGenerator(
 
     let currentMatchingNodes: FiberNode[] = [node];
     let currentMatchingSelectorPartIndex = 0;
-    let currentMatchingSelectorPart: CSSwhat.Selector =
-      parsedSelector[currentMatchingSelectorPartIndex];
-    let lastRelationshipSelectorPart: CSSwhat.Selector | undefined = undefined;
+    let lastRelationshipSelectorPart: CSSWhat.Selector | undefined = undefined;
 
     while (currentMatchingSelectorPartIndex < parsedSelector.length) {
       const nextMatchingNodes: FiberNode[] = [];
 
       for (const currentNode of currentMatchingNodes) {
+        const currentMatchingSelectorPart: CSSWhat.Selector =
+          parsedSelector[currentMatchingSelectorPartIndex];
         if (["tag"].includes(currentMatchingSelectorPart.type)) {
-          const traverseIterator = traverseGenerator(currentNode);
+          const startParams = {
+            skipSelfForStartNode: true,
+            skipSiblingForStartNode: true
+          };
+
+          let nextParams: {
+            skipChild?: boolean;
+            skipSibling?: boolean;
+          } = {};
+          if (
+            lastRelationshipSelectorPart === undefined ||
+            lastRelationshipSelectorPart.type === "descendant"
+          ) {
+            nextParams = { skipChild: false, skipSibling: false };
+          } else if (lastRelationshipSelectorPart.type === "child") {
+            // visit only first level of child
+            nextParams = { skipChild: true };
+          } else if (lastRelationshipSelectorPart.type === "sibling") {
+            // visit only siblings of start node
+            nextParams = { skipChild: true, skipSibling: true };
+            startParams.skipSiblingForStartNode = false;
+          }
+
+          const traverseIterator = traverseGenerator(currentNode, startParams);
 
           // Handle supported non-traversal parts here
           if (currentMatchingSelectorPart.type == "tag") {
-            for (const tmpNode of traverseIterator) {
+            let tmpNode: FiberNode;
+            while (
+              !({ value: tmpNode } = traverseIterator.next(nextParams)).done
+            ) {
               if (
                 isNodeNotHtmlLike(tmpNode) &&
                 tmpNode.type.name === currentMatchingSelectorPart.name
@@ -57,11 +85,15 @@ function* matchGenerator(
               }
             }
           }
-          traverseIterator.throw &&
-            traverseIterator.throw(new Error("cleanup"));
-        } else if (["descendant"].includes(currentMatchingSelectorPart.type)) {
-          // Handle traversal parts here
+          // traverseIterator.throw &&
+          //   traverseIterator.throw(new Error("cleanup"));
+        } else if (
+          ["descendant", "child"].includes(currentMatchingSelectorPart.type)
+        ) {
+          // Handle traversal parts here - Save for look back in next part
           lastRelationshipSelectorPart = currentMatchingSelectorPart;
+          // Preserve currentMatchingNodes
+          nextMatchingNodes.push(...currentMatchingNodes);
         } else {
           // For unhandled parts
           lastRelationshipSelectorPart = undefined;
@@ -69,10 +101,41 @@ function* matchGenerator(
       }
 
       currentMatchingNodes = nextMatchingNodes;
+      currentMatchingSelectorPartIndex += 1;
+    }
+
+    for (const tmpNode of currentMatchingNodes) {
+      yield tmpNode;
     }
 
     return;
   }
 }
 
-export { matchGenerator };
+function matchAll(
+  node: FiberNode,
+  match: string | CSSWhat.Selector[][]
+): Array<FiberNode> {
+  return [...matchGenerator(node, match)];
+}
+
+function matchFirst(
+  node: FiberNode,
+  match: string | CSSWhat.Selector[][]
+): FiberNode | null {
+  const matchIterator = matchGenerator(node, match);
+  const firstResult = matchIterator.next();
+
+  // Cancel generator
+  matchIterator.throw && matchIterator.throw(new Error("Cleanup"));
+
+  // If match found, return that
+  if (!firstResult.done) {
+    return firstResult.value;
+  }
+
+  // Else return null
+  return null;
+}
+
+export { matchGenerator, matchAll, matchFirst };