Squatted crate for a Modern Parser Generator.

Contact @CAD97 if you want to collaborate on development of this tool. Solo development will happen when they find time and motivation concurrently.

Until then, check out tree-sitter.

Namely, inspired by matklad's post, mpg will provide

UX

Tooling designed IDE-first.

• Interactive development. Provide example inputs while editing the grammar and immediately see the resulting syntax trees.
• Inline snapshot tests. Example productions listed next to the defining rules are automatically tested with the resulting syntax trees tracked in version control.
• Full LSP support.

API

• Designed to be used on top of a separate lexer.
• Supports pull-lexing with principled lexical feedback.
• Prefers pre-lexing with replayable incremental reparsing.
• Produces a homogeneous literal syntax tree.
• Provides an optional typed view of the literal syntax tree.
• Embeddable anywhere via a C API.

Parsing Techniques

• Specify operator precedence and associativity directly.
• Strong error tolerance/recovery via follow sets and explicit recovery points.
• Choose your tradeoffs:
  • Guaranteed determinism at a cost of generality.
  • Full generality at the cost of ambiguity.

Quality of incorrect syntax error messages is a non-priority left to the user.