Crate sct_scg

Expand description

The SNOMED CT Compositional Grammar: the syntax of post-coordinated expressions.

A logos lexer and a winnow parser faithful to the normative ABNF (https://docs.snomed.org/snomed-ct-specifications/snomed-ct-compositional-grammar-specification/design/5-syntax-specification), a syntax tree named after the grammar’s rules, and a printer whose output parses back to the same tree.

The crate is syntax only: it resolves no concept identifier, checks no concept model, and decides no subsumption.

Modules§

ast: The syntax tree, named after the rules of the normative ABNF (https://docs.snomed.org/snomed-ct-specifications/snomed-ct-compositional-grammar-specification/design/5-syntax-specification).
front: The front both SNOMED CT languages read through.
lexer: The token layer of the Compositional Grammar: the ABNF’s character rules folded into the tokens the parser consumes (ws, term, stringValue, digit, and each literal the grammar spells).
parser: The parser: one function per rule of the normative ABNF, over the token stream of crate::lexer, with winnow.