[plantuml] fix direction in lollipop

Author: hoe-jo

plantuml/parser/puml_resolver/src/component_diagram/src/component_resolver.rs

@@ -471,9 +471,14 @@ impl ComponentResolver {
             });
         }
 
-        let decor_role = if line == "-" && left == ")" && middle.is_empty() && right.is_empty() {
+        // A lollipop line may carry a direction hint, which adds a second dash
+        // segment: `)-u-` or `-u-(`.  The line field then contains `"--"` instead
+        // of `"-"`.  Direction is visual-only and does not affect semantics.
+        let is_lollipop_line = line.chars().all(|c| c == '-') && !line.is_empty();
+
+        let decor_role = if is_lollipop_line && left == ")" && middle.is_empty() && right.is_empty() {
             Some(EndpointRole::Provided)
-        } else if line == "-"
+        } else if is_lollipop_line
             && left.is_empty()
             && ((middle == "(" && right.is_empty()) || (middle.is_empty() && right == "("))
         {

validation/core/src/readers/component_diagram_reader.rs

@@ -26,12 +26,30 @@ pub struct ComponentDiagramReader;
 impl ComponentDiagramReader {
     /// Read all `Component` and `Package` entities from the given FlatBuffers
     /// binary files.
+    ///
+    /// Files that carry a known non-component file identifier (e.g. `CLSD` for
+    /// class diagrams or `SEQD` for sequence diagrams) are silently skipped so
+    /// that callers can pass all architectural-design FlatBuffers without
+    /// pre-filtering by diagram type.
     pub fn read(paths: &[String]) -> Result<ComponentDiagramInputs, String> {
         let mut out = Vec::new();
 
         for path in paths {
             let data = fs::read(path).map_err(|e| format!("Failed to read {path}: {e}"))?;
 
+            // FlatBuffers stores the file identifier at bytes 4-7 when one is
+            // present.  Component diagrams are written without an identifier
+            // (builder.finish(root, None)), so bytes 4-7 are regular data.
+            // Class diagrams ("CLSD") and sequence diagrams ("SEQD") carry an
+            // explicit identifier.  Skip such files here; they are not
+            // component diagrams and must not be parsed with the component schema.
+            if data.len() >= 8 {
+                let file_id = &data[4..8];
+                if file_id == b"CLSD" || file_id == b"SEQD" {
+                    continue;
+                }
+            }
+
             let graph = flatbuffers::root::<fb_component::ComponentGraph>(&data)
                 .map_err(|e| format!("Failed to parse FlatBuffer {path}: {e}"))?;