Parser fails with `"A FROM_FILE line ('---') must be directly followed by a TO_FILE line ('+++')"` when diff contains YAML document separators

[ivanalvarado]

When parsing a git diff that contains YAML document separators (---) as part of the file content (not as part of the diff header), the parser throws:

A FROM_FILE line ('---') must be directly followed by a TO_FILE line ('+++')!

This occurs when the YAML file has multi-document content and one of those document boundaries is added in the diff.

Minimal Example

diff --git a/example.yaml b/example.yaml
index 1111111..2222222 100644
--- a/example.yaml
+++ b/example.yaml
@@ -8,9 +8,9 @@ metadata:
   name: "Example"
   description: "Example description"
   tags:
-  - tag-old
+  - tag-new
  spec:
   key1: value1
-  key2: value2
----
+  key2: value2
+---
  apiVersion: example.io/v1
  kind: Component
  metadata:
@@ -22,6 +22,24 @@ spec:
   dependsOn: []
   type: library
   lifecycle: production
   owner: example-owner

+---
+apiVersion: example.io/v1
+kind: Component
+metadata:
+  name: "AnotherExample"
+  description: "Another doc added"
+  tags:
+    - tag1
+    - tag2
+spec:
+  dependsOn: []
+  type: library
+  lifecycle: production
+  owner: example-owner

Expected Behavior

The parser should treat --- as a line addition (content) and not confuse it with the diff header.

Actual Behavior

Throws:

A FROM_FILE line ('---') must be directly followed by a TO_FILE line ('+++')!

Notes

• This happens consistently when the diff adds a YAML document separator.
• Verified on version: io.reflectoring.diffparser:diffparser:1.4