Support --learn for inline expectation tests

cpp/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,13 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // C/C++ databases can also contain XML (e.g. `.xml`, `.props`), whose block-comment
+    // syntax is not yet supported, so we only render for C/C++ sources.
+    relativePath
+        .regexpMatch(".*\\.(c|cc|cpp|cxx|cp|c\\+\\+|h|hh|hpp|hxx|h\\+\\+|inl|tcc|ipp|tpp|cu|cuh)") and
+    result = "//"
+  }
 }

csharp/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // C# databases can also contain XML (e.g. `.csproj`, `.config`) and Razor markup, whose
+    // comment syntaxes are not yet supported, so we only render for C# sources.
+    relativePath.regexpMatch(".*\\.(cs|csx)") and
+    result = "//"
+  }
 }

go/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // Go databases can also contain XML, whose block-comment syntax is not yet supported, so
+    // we only render for Go sources.
+    relativePath.matches("%.go") and
+    result = "//"
+  }
 }

java/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // Java databases can also contain XML; those files use a different (block) comment
+    // syntax that is not yet supported, so we only render for Java and Kotlin sources.
+    (relativePath.matches("%.java") or relativePath.matches("%.kt")) and
+    result = "//"
+  }
 }

javascript/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // JavaScript databases can also contain HTML, whose (block) comment syntax is not yet
+    // supported, so we only render for the line-comment source files.
+    relativePath.regexpMatch(".*\\.(js|cjs|mjs|jsx|ts|cts|mts|tsx)") and
+    result = "//"
+  }
 }

python/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // Python databases can also contain XML, whose block-comment syntax is not yet supported,
+    // so we only render for Python sources.
+    relativePath.regexpMatch(".*\\.(py|pyi)") and
+    result = "#"
+  }
 }

ql/ql/src/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // The QL extractor can also extract YAML (e.g. `qlpack.yml`), whose `#` comment syntax
+    // differs, so we only render for QL sources and dbscheme files.
+    relativePath.regexpMatch(".*\\.(ql|qll|dbscheme)") and
+    result = "//"
+  }
 }

ruby/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // Ruby databases can also contain ERB, whose comment syntax is not yet supported, so we
+    // only render for plain Ruby sources.
+    relativePath.matches("%.rb") and
+    result = "#"
+  }
 }

rust/ql/lib/utils/test/InlineExpectationsTestQuery.ql

@@ -18,4 +18,12 @@ private module Input implements T::TestPostProcessing::InputSig<Impl> {
         f.getRelativePath() + ":" + startline + ":" + startcolumn + ":" + endline + ":" + endcolumn
     )
   }
+
+  bindingset[relativePath]
+  string getStartCommentMarker(string relativePath) {
+    // Rust databases can also contain YAML, whose `#` comment syntax differs, so we only
+    // render for Rust sources.
+    relativePath.matches("%.rs") and
+    result = "//"
+  }
 }