From bb2c58b9775e250cb934894ee7d56af57feccdb7 Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Thu, 22 Feb 2018 13:22:52 -0800
Subject: [PATCH] Simplify uses of getPossibleSymbolReferencePositions (#22099)

---
 src/services/findAllReferences.ts | 83 +++++++++----------------------
 1 file changed, 23 insertions(+), 60 deletions(-)

diff --git a/src/services/findAllReferences.ts b/src/services/findAllReferences.ts
index 46a17707e79..41bc5685f80 100644
--- a/src/services/findAllReferences.ts
+++ b/src/services/findAllReferences.ts
@@ -743,18 +743,13 @@ namespace ts.FindAllReferences.Core {
     }
 
     function getLabelReferencesInNode(container: Node, targetLabel: Identifier): SymbolAndEntries[] {
-        const references: Entry[] = [];
         const sourceFile = container.getSourceFile();
         const labelName = targetLabel.text;
-        const possiblePositions = getPossibleSymbolReferencePositions(sourceFile, labelName, container);
-        for (const position of possiblePositions) {
+        const references = mapDefined(getPossibleSymbolReferencePositions(sourceFile, labelName, container), position => {
             const node = getTouchingWord(sourceFile, position, /*includeJsDocComment*/ false);
             // Only pick labels that are either the target label, or have a target that is the target label
-            if (node && (node === targetLabel || (isJumpStatementTarget(node) && getTargetLabel(node, labelName) === targetLabel))) {
-                references.push(nodeEntry(node));
-            }
-        }
-
+            return node && (node === targetLabel || (isJumpStatementTarget(node) && getTargetLabel(node, labelName) === targetLabel)) ? nodeEntry(node) : undefined;
+        });
         return [{ definition: { type: "label", node: targetLabel }, references }];
     }
 
@@ -780,24 +775,16 @@ namespace ts.FindAllReferences.Core {
     }
 
     function getAllReferencesForKeyword(sourceFiles: ReadonlyArray<SourceFile>, keywordKind: ts.SyntaxKind, cancellationToken: CancellationToken): SymbolAndEntries[] {
-        const references: NodeEntry[] = [];
-        for (const sourceFile of sourceFiles) {
+        const references = flatMap(sourceFiles, sourceFile => {
             cancellationToken.throwIfCancellationRequested();
-            addReferencesForKeywordInFile(sourceFile, keywordKind, tokenToString(keywordKind), references);
-        }
+            return mapDefined(getPossibleSymbolReferencePositions(sourceFile, tokenToString(keywordKind), sourceFile), position => {
+                const referenceLocation = getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
+                return referenceLocation.kind === keywordKind ? nodeEntry(referenceLocation) : undefined;
+            });
+        });
         return references.length ? [{ definition: { type: "keyword", node: references[0].node }, references }] : undefined;
     }
 
-    function addReferencesForKeywordInFile(sourceFile: SourceFile, kind: SyntaxKind, searchText: string, references: Push<NodeEntry>): void {
-        const possiblePositions = getPossibleSymbolReferencePositions(sourceFile, searchText, sourceFile);
-        for (const position of possiblePositions) {
-            const referenceLocation = getTouchingPropertyName(sourceFile, position, /*includeJsDocComment*/ true);
-            if (referenceLocation.kind === kind) {
-                references.push(nodeEntry(referenceLocation));
-            }
-        }
-    }
-
     function getReferencesInSourceFile(sourceFile: ts.SourceFile, search: Search, state: State): void {
         state.cancellationToken.throwIfCancellationRequested();
         return getReferencesInContainer(sourceFile, sourceFile, search, state);
@@ -1288,15 +1275,11 @@ namespace ts.FindAllReferences.Core {
                 return undefined;
         }
 
-        const references: Entry[] = [];
-
         const sourceFile = searchSpaceNode.getSourceFile();
-        const possiblePositions = getPossibleSymbolReferencePositions(sourceFile, "super", searchSpaceNode);
-        for (const position of possiblePositions) {
+        const references = mapDefined(getPossibleSymbolReferencePositions(sourceFile, "super", searchSpaceNode), position => {
             const node = getTouchingWord(sourceFile, position, /*includeJsDocComment*/ false);
-
             if (!node || node.kind !== SyntaxKind.SuperKeyword) {
-                continue;
+                return;
             }
 
             const container = getSuperContainer(node, /*stopOnFunctions*/ false);
@@ -1304,10 +1287,8 @@ namespace ts.FindAllReferences.Core {
             // If we have a 'super' container, we must have an enclosing class.
             // Now make sure the owning class is the same as the search-space
             // and has the same static qualifier as the original 'super's owner.
-            if (container && (ModifierFlags.Static & getModifierFlags(container)) === staticFlag && container.parent.symbol === searchSpaceNode.symbol) {
-                references.push(nodeEntry(node));
-            }
-        }
+            return container && (ModifierFlags.Static & getModifierFlags(container)) === staticFlag && container.parent.symbol === searchSpaceNode.symbol ? nodeEntry(node) : undefined;
+        });
 
         return [{ definition: { type: "symbol", symbol: searchSpaceNode.symbol, node: superKeyword }, references }];
     }
@@ -1348,19 +1329,10 @@ namespace ts.FindAllReferences.Core {
         }
 
         const references: Entry[] = [];
-
-        let possiblePositions: ReadonlyArray<number>;
-        if (searchSpaceNode.kind === SyntaxKind.SourceFile) {
-            forEach(sourceFiles, sourceFile => {
-                cancellationToken.throwIfCancellationRequested();
-                possiblePositions = getPossibleSymbolReferencePositions(sourceFile, "this");
-                getThisReferencesInFile(sourceFile, sourceFile, possiblePositions, staticFlag, references);
-            });
-        }
-        else {
-            const sourceFile = searchSpaceNode.getSourceFile();
-            possiblePositions = getPossibleSymbolReferencePositions(sourceFile, "this", searchSpaceNode);
-            getThisReferencesInFile(sourceFile, searchSpaceNode, possiblePositions, staticFlag, references);
+        for (const sourceFile of searchSpaceNode.kind === SyntaxKind.SourceFile ? sourceFiles : [searchSpaceNode.getSourceFile()]) {
+            cancellationToken.throwIfCancellationRequested();
+            const positions = getPossibleSymbolReferencePositions(sourceFile, "this", isSourceFile(searchSpaceNode) ? sourceFile : searchSpaceNode);
+            getThisReferencesInFile(sourceFile, searchSpaceNode.kind === SyntaxKind.SourceFile ? sourceFile : searchSpaceNode, positions, staticFlag, references);
         }
 
         return [{
@@ -1409,27 +1381,18 @@ namespace ts.FindAllReferences.Core {
     }
 
     function getReferencesForStringLiteral(node: StringLiteral, sourceFiles: ReadonlyArray<SourceFile>, cancellationToken: CancellationToken): SymbolAndEntries[] {
-        const references: NodeEntry[] = [];
-
-        for (const sourceFile of sourceFiles) {
+        const references = flatMap(sourceFiles, sourceFile => {
             cancellationToken.throwIfCancellationRequested();
-            const possiblePositions = getPossibleSymbolReferencePositions(sourceFile, node.text);
-            getReferencesForStringLiteralInFile(sourceFile, node.text, possiblePositions, references);
-        }
+            return mapDefined(getPossibleSymbolReferencePositions(sourceFile, node.text), position => {
+                const ref = tryCast(getTouchingWord(sourceFile, position, /*includeJsDocComment*/ false), isStringLiteral);
+                return ref && ref.text === node.text ? nodeEntry(ref, /*isInString*/ true) : undefined;
+            });
+        });
 
         return [{
             definition: { type: "string", node },
             references
         }];
-
-        function getReferencesForStringLiteralInFile(sourceFile: SourceFile, searchText: string, possiblePositions: ReadonlyArray<number>, references: Push<NodeEntry>): void {
-            for (const position of possiblePositions) {
-                const node = getTouchingWord(sourceFile, position, /*includeJsDocComment*/ false);
-                if (node && node.kind === SyntaxKind.StringLiteral && (node as StringLiteral).text === searchText) {
-                    references.push(nodeEntry(node, /*isInString*/ true));
-                }
-            }
-        }
     }
 
     // For certain symbol kinds, we need to include other symbols in the search set.