Merge branch 'develop' into feature/3250/add_vertline_to_gantt_plot

Author: megantriplett

.changeset/sixty-deer-tell.md

@@ -0,0 +1,5 @@
+---
+'mermaid': major
+---
+
+fix: allow sequence diagram arrows with a trailing colon but no message

packages/mermaid/src/diagrams/sequence/parser/sequenceDiagram.jison

@@ -84,7 +84,8 @@ accDescr\s*"{"\s*                                { this.begin("acc_descr_multili
 \-\-[x]                                                         return 'DOTTED_CROSS';
 \-[\)]                                                          return 'SOLID_POINT';
 \-\-[\)]                                                        return 'DOTTED_POINT';
-":"(?:(?:no)?wrap:)?[^#\n;]+                                    return 'TXT';
+":"(?:(?:no)?wrap:)?[^#\n;]*                                    return 'TXT';
+":"                             								return 'TXT';
 "+"                                                             return '+';
 "-"                                                             return '-';
 <<EOF>>                                                         return 'NEWLINE';

packages/mermaid/src/diagrams/sequence/sequenceDiagram.spec.js

@@ -2022,4 +2022,20 @@ describe('sequence db class', () => {
       expect(Object.hasOwn(sequenceDb, fun)).toBe(true);
     }
   });
+  // This test verifies that messages with a colon but no content (e.g., "Alice->>Bob:")
+  // are correctly parsed as valid messages with an empty string as the message content.
+
+  it('should parse a message with a trailing colon but no content', async () => {
+    const diagram = await Diagram.fromText(`
+sequenceDiagram
+Alice->>Bob:
+Bob->>Alice:Got it!
+`);
+
+    const messages = diagram.db.getMessages();
+    expect(messages.length).toBe(2);
+    expect(messages[0].message).toBe('');
+    expect(messages[0].from).toBe('Alice');
+    expect(messages[0].to).toBe('Bob');
+  });
 });