From 4820626f291354570ea113c9c32155ae8ec68757 Mon Sep 17 00:00:00 2001
From: Rasmus Wriedt Larsen <rasmuswl@github.com>
Date: Fri, 6 Sep 2024 14:04:46 +0200
Subject: [PATCH 1/2] Add SyntaxError query

This can be used by autofix, but might also be nice to help find YAML syntax errors :shrug:
---
 ql/src/Debug/SyntaxError.ql                     | 17 +++++++++++++++++
 .../SyntaxError/SyntaxError.expected            |  1 +
 .../query-tests/SyntaxError/SyntaxError.qlref   |  1 +
 ql/test/query-tests/SyntaxError/options         |  1 +
 4 files changed, 20 insertions(+)
 create mode 100644 ql/src/Debug/SyntaxError.ql
 create mode 100644 ql/test/query-tests/SyntaxError/SyntaxError.expected
 create mode 100644 ql/test/query-tests/SyntaxError/SyntaxError.qlref
 create mode 100644 ql/test/query-tests/SyntaxError/options

diff --git a/ql/src/Debug/SyntaxError.ql b/ql/src/Debug/SyntaxError.ql
new file mode 100644
index 00000000000..9a638ad7fbe
--- /dev/null
+++ b/ql/src/Debug/SyntaxError.ql
@@ -0,0 +1,17 @@
+/**
+ * @name Syntax error
+ * @description A piece of code could not be parsed due to syntax errors.
+ * @kind problem
+ * @problem.severity recommendation
+ * @id actions/syntax-error
+ * @tags reliability
+ *       correctness
+ *       language-features
+ *       debug
+ * @precision very-high
+ */
+
+private import codeql.actions.ast.internal.Yaml
+
+from YamlParseError pe
+select pe, pe.getMessage()
diff --git a/ql/test/query-tests/SyntaxError/SyntaxError.expected b/ql/test/query-tests/SyntaxError/SyntaxError.expected
new file mode 100644
index 00000000000..386e6554e2d
--- /dev/null
+++ b/ql/test/query-tests/SyntaxError/SyntaxError.expected
@@ -0,0 +1 @@
+| .github/workflows/malformed.yml:7:4:7:4 | expected <block end>, but found '<block sequence start>' | expected <block end>, but found '<block sequence start>' |
diff --git a/ql/test/query-tests/SyntaxError/SyntaxError.qlref b/ql/test/query-tests/SyntaxError/SyntaxError.qlref
new file mode 100644
index 00000000000..97c5686103c
--- /dev/null
+++ b/ql/test/query-tests/SyntaxError/SyntaxError.qlref
@@ -0,0 +1 @@
+Debug/SyntaxError.ql
diff --git a/ql/test/query-tests/SyntaxError/options b/ql/test/query-tests/SyntaxError/options
new file mode 100644
index 00000000000..096355709a6
--- /dev/null
+++ b/ql/test/query-tests/SyntaxError/options
@@ -0,0 +1 @@
+semmle-extractor-options: --tolerate-parse-errors --experimental

From 2f68e6f26e352ce0373300b386828a5cd05c7633 Mon Sep 17 00:00:00 2001
From: Rasmus Wriedt Larsen <rasmuswl@github.com>
Date: Fri, 6 Sep 2024 14:53:46 +0200
Subject: [PATCH 2/2] Add missing test file

---
 .../SyntaxError/.github/workflows/malformed.yml            | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 ql/test/query-tests/SyntaxError/.github/workflows/malformed.yml

diff --git a/ql/test/query-tests/SyntaxError/.github/workflows/malformed.yml b/ql/test/query-tests/SyntaxError/.github/workflows/malformed.yml
new file mode 100644
index 00000000000..a8bfa4ae19a
--- /dev/null
+++ b/ql/test/query-tests/SyntaxError/.github/workflows/malformed.yml
@@ -0,0 +1,7 @@
+on: pull_request_target
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+   - run: echo ${{ github.event.pull_request.body}}