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State diagram: fork, join, and history pseudostates

Native stateDiagram / stateDiagram-v2 parsing and rendering support synchronization bars (fork/join) and history nodes (shallow H, deep H*) aligned with common Mermaid syntax.

Parsing

Syntax State.pseudostate Label used for layout/render
state id <<fork>> Fork Empty unless state "…" as id <<fork>> supplies text
state id <<join>> Join Same as fork
Transition endpoint [H] HistoryShallow H
Transition endpoint [H*] HistoryDeep H*
state [H] / state [H*] Shallow / deep H / H*

Stereotypes are detected via a trailing <<fork>> / <<join>> suffix after stripping from composite state … { headers and simple state … lines.

Layout and rendering

  • Fork/join: Fixed width (~88px minimum scaled by config), height 16px; drawn as a filled horizontal bar using the diagram stroke color. Optional alias text is drawn below the bar.
  • History: Uses normal state height and label-based width; drawn as a circle (stroke) with centered H or H* text.

Transitions use the same anchor logic as other rectangular nodes (wide shallow bars resolve on left/right edges by direction).

Tests

See src/markdown/mermaid/state.rs (#[cfg(test)] mod tests) for parse coverage and validate_mermaid_source acceptance of combined fork/join/history diagrams.

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