Enhancement to parse WebSequenceDiagrams

[jgwinner]

Description

I'm using Structurizr to generate dynamic views. It can export "Websequencediagrams".

They LOOK like Mermaid's SequenceDiagrams, but there are some implemenation differences.

I searched for Websequencediagrams but didn't see any issues, so I figured this was worth a request for an enhancement and/or bug fix.

Specifics:

When I generate a WebSequencediagram export , the exported lines look like this:

title ANS - Dynamic - AllFlows

actor <<Person>>\nAPI User as API User
participant <<Component>>\nAPI Gateway as API Gateway
participant <<Component>>\nManages Event definition as Manages Event definition

Yet in Notion.so, it generates this error:

Unknown error: Error: Lexical error on line 5. Unrecognized text.
... - AllFlows"actor <<Person>>\nAPI User
_______________________^

If I fix that by removing <<Person>>\n it'll generate the same errors for <<Component>>\n

This seems like a bug or at least a needed enhancement. In WebSequenceDiagrams, it looks like this:

That seems to be a really useful enhancement.

Also, I find Websequencediagrams uses -> to indicate a single arrow, while Mermaid expects ->> and -->>. Mermaid seems to be superior in that sense to Websequencediagrams as it can't indicate a single line, I'm not sure if this could be fixed except maybe as some kind of directive, or an entirely new type of diagram.

Maybe "webSequenceDiagram" as a type, but the label enhancements seem pretty useful.

Steps to reproduce

1. Create a Structurizr dynamic view.
2. Export via structurizr.sh export -w ANS.dsl -f websequencediagrams
3. Create a Mermaid code block in Notion.so
4. type 'sequenceDiagram' and press enter.
5. Paste in the *.wsd file from step 2

Screenshots

Fixing that gives:

Code Sample

sequenceDiagram
    actor <<test>>\nJohn
    Alice-><<test>>\nJohn: Hello John, how are you?
    John-->Alice: Great!
    Alice-)John: See you later!

Setup

• Mermaid version: Unsure, live Notion.so - I did check 'develop' and it errors out as well.
• Browser and Version: Chrome on Mac, Version 117.0.5938.132 (Official Build) (arm64)

Suggested Solutions

Allow actor labels with embedded <<'s as well as translate the \n to a multiline label.

Additional Context

No response

[jgwinner]

Ah, I found out <BR /> apparently works, but not the << symbols.

Structurizr has a parameter:

            properties {
                "mermaid.sequenceDiagram" "true" 
            }

Which converts the WebSequenceDiagrams to mermaid style. I'll close the ticket.