Fast Mermaid Validator MCP

# ZenUML Grammar Files This directory contains the ANTLR4 grammar files for ZenUML sequence diagram parsing, extracted from the official [mermaid-js/zenuml-core](https://github.com/mermaid-js/zenuml-core) repository. ## Files - `sequenceLexer.g4` - ANTLR4 lexer grammar for ZenUML tokenization - `sequenceParser.g4` - ANTLR4 parser grammar for ZenUML syntax parsing ## Integration ZenUML validation uses ANTLR4 (.g4) grammar files, unlike other diagram types that use either: - **Jison grammars** (18 types in `src/services/grammars/`) - **Langium grammars** (7 types in `src/services/language/`) ## Usage These grammar files are used by the ZenUML validator for syntax validation of ZenUML sequence diagrams. The validator currently uses basic validation fallback until full ANTLR4 integration is implemented. ## Source Grammar files sourced from: https://github.com/mermaid-js/zenuml-core/tree/main/src/g4