CDL: Improve performance by simplifying location identification

We can assume that the path in the cds.json is relative to the
repository root, as that is the directory the CDS compiler is run
from.

Author: lcartey

javascript/frameworks/cap/lib/advanced_security/javascript/frameworks/cap/CDL.qll

@@ -14,11 +14,12 @@ abstract class CdlObject extends JsonObject {
       exists(Location loc, JsonValue locValue |
         loc = this.getLocation() and
         locValue = this.getPropValue("$location") and
+        // The path in the cds.json file is relative to the working directory used when running
+        // the cds compile command. In our extractor, that's always the root of the repository,
+        // so we can identify the entry in the `File` table by its relative path.
         path =
-          any(File f |
-            f.getAbsolutePath()
-                .matches("%" + locValue.getPropValue("file").getStringValue() + ".json")
-          ).getAbsolutePath().regexpReplaceAll("\\.json$", "") and
+          any(File f | f.getRelativePath() = locValue.getPropValue("file").getStringValue())
+              .getAbsolutePath() and
         if
           not exists(locValue.getPropValue("line")) and
           not exists(locValue.getPropValue("col"))