feat(treesitter): add yaml rules and testdata

internal/treesitter/parser_test.go

@@ -252,6 +252,17 @@ int main() { std::cout << "Hello C++\n"; return 0; }`)
 		}
 	})
 
+	t.Run("valid yaml source", func(t *testing.T) {
+		src := []byte("name: diffmantic\nversion: 1.0\nservices:\n  - web\n  - db\n")
+		ast, err := Parse(src, "config.yaml")
+		if err != nil {
+			t.Fatalf("Parse(): unexpected error: %v", err)
+		}
+		if ast == nil {
+			t.Error("Parse(): expected non-nil AST root")
+		}
+	})
+
 	t.Run("unknown extension", func(t *testing.T) {
 		src := []byte(`some text`)
 		ast, err := Parse(src, "main.xyz")

internal/treesitter/yaml/rules.yml

@@ -0,0 +1,41 @@
+flattened:
+  - string_scalar
+  - double_quote_scalar
+  - single_quote_scalar
+  - plain_scalar
+  - comment
+
+ignored:
+  - ":"
+  - "-"
+  - "{"
+  - "}"
+  - "["
+  - "]"
+  - ","
+  - "?"
+
+scaffolding:
+  - stream
+  - document
+  - block_node
+  - block_mapping
+  - block_mapping_pair
+  - block_sequence
+  - block_sequence_item
+  - flow_mapping
+  - flow_sequence
+
+unordered:
+  - block_mapping
+  - flow_mapping
+
+identifiers:
+  - tag
+  - anchor_name
+  - alias_name
+
+pairs:
+  - block_mapping_pair
+  - flow_pair
+

tests/testdata/yaml_k8s_examples_cassandra_scalar_replica/metadata.json

@@ -0,0 +1,6 @@
+{
+  "repository": "kubernetes/examples",
+  "commit": "unknown",
+  "description": "Update cassandra deployment spec",
+  "language": "yaml"
+}

tests/testdata/yaml_k8s_examples_cassandra_scalar_replica/new.yaml

@@ -0,0 +1,31 @@
+apiVersion: v1beta3
+kind: Pod
+metadata:
+  labels:
+    name: cassandra
+  name: cassandra
+spec:
+  containers:
+  - args:
+    - /run.sh
+    resources:
+      limits:
+        cpu: "1"      
+    image: gcr.io/google_containers/cassandra:v3
+    name: cassandra
+    ports:
+    - name: cql
+      containerPort: 9042
+    - name: thrift
+      containerPort: 9160
+    volumeMounts:
+    - name: data
+      mountPath: /cassandra_data
+    env:
+    - name: MAX_HEAP_SIZE
+      value: 512M
+    - name: HEAP_NEWSIZE
+      value: 100M
+  volumes:
+    - name: data
+      emptyDir: {}

tests/testdata/yaml_k8s_examples_cassandra_scalar_replica/old.yaml

@@ -0,0 +1,33 @@
+apiVersion: v1beta3
+kind: Pod
+metadata:
+  labels:
+    name: cassandra
+  name: cassandra
+spec:
+  containers:
+  - args:
+    - /run.sh
+    resources:
+      limits:
+        cpu: "1"      
+    image: gcr.io/google_containers/cassandra:v3
+    name: cassandra
+    ports:
+    - name: cql
+      containerPort: 9042
+    - name: thrift
+      containerPort: 9160
+    volumeMounts:
+    - name: data
+      mountPath: /cassandra_data
+    env:
+    - name: MAX_HEAP_SIZE
+      value: 512M
+    - name: HEAP_NEWSIZE
+      value: 100M
+    - name: KUBERNETES_API_PROTOCOL
+      value: http
+  volumes:
+    - name: data
+      emptyDir: {}