Merge pull request #4643 from nickrolfe/getFileBySourceArchiveName

Replace getEncodedFile with shared getFileBySourceArchiveName predicate

cpp/ql/src/IDEContextual.qll

@@ -0,0 +1,22 @@
+/**
+ * Provides shared predicates related to contextual queries in the code viewer.
+ */
+
+import semmle.files.FileSystem
+
+/**
+ * Returns the `File` matching the given source file name as encoded by the VS
+ * Code extension.
+ */
+cached
+File getFileBySourceArchiveName(string name) {
+  // The name provided for a file in the source archive by the VS Code extension
+  // has some differences from the absolute path in the database:
+  // 1. colons are replaced by underscores
+  // 2. there's a leading slash, even for Windows paths: "C:/foo/bar" ->
+  //    "/C_/foo/bar"
+  // 3. double slashes in UNC prefixes are replaced with a single slash
+  // We can handle 2 and 3 together by unconditionally adding a leading slash
+  // before replacing double slashes.
+  name = ("/" + result.getAbsolutePath().replaceAll(":", "_")).replaceAll("//", "/")
+}

cpp/ql/src/definitions.qll

@@ -4,6 +4,7 @@
  */
 
 import cpp
+import IDEContextual
 
 /**
  * Any element that might be the source or target of a jump-to-definition
@@ -207,11 +208,3 @@ Top definitionOf(Top e, string kind) {
   // later on.
   strictcount(result.getLocation()) < 10
 }
-
-/**
- * Returns an appropriately encoded version of a filename `name`
- * passed by the VS Code extension in order to coincide with the
- * output of `.getFile()` on locatable entities.
- */
-cached
-File getEncodedFile(string name) { result.getAbsolutePath().replaceAll(":", "_") = name }

cpp/ql/src/localDefinitions.ql

@@ -12,5 +12,5 @@ import definitions
 external string selectedSourceFile();
 
 from Top e, Top def, string kind
-where def = definitionOf(e, kind) and e.getFile() = getEncodedFile(selectedSourceFile())
+where def = definitionOf(e, kind) and e.getFile() = getFileBySourceArchiveName(selectedSourceFile())
 select e, def, kind

cpp/ql/src/localReferences.ql

@@ -12,5 +12,6 @@ import definitions
 external string selectedSourceFile();
 
 from Top e, Top def, string kind
-where def = definitionOf(e, kind) and def.getFile() = getEncodedFile(selectedSourceFile())
+where
+  def = definitionOf(e, kind) and def.getFile() = getFileBySourceArchiveName(selectedSourceFile())
 select e, def, kind

cpp/ql/src/printAst.ql

@@ -22,6 +22,6 @@ class Cfg extends PrintASTConfiguration {
    * Print All functions from the selected file.
    */
   override predicate shouldPrintFunction(Function func) {
-    func.getFile() = getEncodedFile(selectedSourceFile())
+    func.getFile() = getFileBySourceArchiveName(selectedSourceFile())
   }
 }