kevinmehall/rust-peg

Health v2 · maintenance only

Adoption not part of the score

1606 stars · 118 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

rust-peg is a Parsing Expression Grammar (PEG) parser generator for Rust, provided as a proc macro that builds a recursive descent parser from a grammar definition. It supports parsing &str, &[u8], &[T], and custom input types, with precedence climbing, parameterized rules, and customizable error reporting.

Use cases

• write a parser for a custom DSL in Rust
• parse structured text like config or data formats
• build an expression parser with operator precedence
• parse token sequences or byte arrays
• generate a recursive descent parser from a grammar

When to choose

• you want grammar and action code together in one Rust macro
• you need precedence climbing for infix/prefix/postfix expressions
• you want parameterized rules and custom input types
• you prefer PEG semantics over LR or combinator parsing

When to avoid

• you need streaming input
• you want grammar definitions in separate files like pest
• you need LR(1) parsing power for ambiguous grammars
• you're parsing binary data with combinators and nom fits better

Facets

library · maturity stable

parser compiler parsers programming-languages developer-tools rust peg parser-generator proc-macro recursive-descent grammar

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