3 Context-Free Parsers
The parser-tools/cfg-parser
library provides a parser generator that is an alternative to that of
parser-tools/yacc.
syntax
(cfg-parser clause ...)
clause =
(grammar (non-terminal-id ((grammar-id ...) maybe-prec expr) ...) ...) | (tokens group-id ...) | (start non-terminal-id ...) | (end token-id ...) | (error expr) | (src-pos)
Creates a parser similar to that of parser. Unlike parser,
cfg-parser, can consume arbitrary and potentially ambiguous context-free
grammars. Its interface is a subset of parser-tools/yacc, with
the following differences:
(start non-terminal-id)
Unlike parser, cfg-parser only allows for a single non-terminal-id.
The cfg-parser form does not support the precs, suppress, debug, or yacc-output options of parser.