plantuml-parser
JSON →A feature-incomplete but robust PEG-based parser for PlantUML syntax, written in JavaScript/TypeScript. Version 0.4.0 (latest) as of 2021, low release cadence. Designed to be used as a library or CLI. Key differentiators: focuses on graceful degradation, parsing partial diagrams without full syntax knowledge, and maintains a large set of test fixtures for reverse engineering the informal PlantUML spec. Not yet feature-complete; contributions welcome.
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