Ixon text format (.ixon): AST-level parser + canonical printer in Rus… - #518
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…t and Lean A Lean-resembling closed grammar denoting the named Ix level (never the pack tables): all decl forms (def/theorem/opaque, axiom, quot, inductive, recursor, mutual, projections), imports as namespace mounts with Name#hash pinned references, and a trailing main expression `|- value : type` (an anonymous definition, marked as the bundle main). - crates/ixon/src/syntax/: nom parser, Wadler-style canonical printer (cached-width doc engine), structured positioned errors, byte/node/depth metering; quickcheck properties (printer fixpoint, totality on arbitrary and mutated input, node count <= printed bytes). - Ix/IxonSyntax/: behavioral Lean mirror (char-array scanner with byte spans, same doc engine); LSpec suite `ixon-syntax` with SlimCheck properties; unit corpora share golden strings with the Rust suite, and both printers emit byte-identical canonical output (verified by direct diff; FFI parity externs come with the resolve stage). Grammar decisions locked by property testing: declaration-starting words are reserved; the main-expression turnstile is required after declarations and optional for sole-item files; the version header is optional (absent means version 1, forever); whitespace is the explicit space/tab/CR/LF set; Name#hash lexing is adjacency-sensitive.
arthurpaulino
approved these changes
Jul 26, 2026
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…t and Lean
A Lean-resembling closed grammar denoting the named Ix level (never the pack tables): all decl forms (def/theorem/opaque, axiom, quot, inductive, recursor, mutual, projections), imports as namespace mounts with Name#hash pinned references, and a trailing main expression
|- value : type(an anonymous definition, marked as the bundle main).ixon-syntaxwith SlimCheck properties; unit corpora share golden strings with the Rust suite, and both printers emit byte-identical canonical output (verified by direct diff; FFI parity externs come with the resolve stage).Grammar decisions locked by property testing: declaration-starting words are reserved; the main-expression turnstile is required after declarations and optional for sole-item files; the version header is optional (absent means version 1, forever); whitespace is the explicit space/tab/CR/LF set; Name#hash lexing is
adjacency-sensitive.