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This is an LR(1) (more precisely pseudo-LALR, with opt-in GLR) parser generator which outputs grammars that can be used by the Lezer parser.
This package exports both a command-line parser generator tool called lezer-generator and a programming interface.
The grammar format that the tool accepts is documented in the system guide.
See test/cases/ for some simple example grammars, or
lezer-javascript for a
real grammar.
The code is licensed under an MIT license.