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        "description": "# rbnf-rts\nRuntime support for generated parsers of RBNF.hs\n\n# More Examples\n\nCheck the `test` directory:\n\n- test\n    - multiply : parser/lexer implementation for multiplications\n    - arith : parser/lexer implementation for arithmetics\n    - relax : parser/lexer implementation for a full-featured programming language\n    - llvmir: parser/lexer implementation for LLVM IR, nearly full-featured\n\n**In each sub-directory of test, you can run tests via directly invoking the test.sh.**, like `cd test/llvmir && bash test.sh`\n\n\n# Native Dependencies\n\n- The Haskell Stack Toolchain\n\n- The executable `rbnf-pgen` in PATH.\n\n    If `~/.local/bin` is already in PATH:\n    ```\n    git clone https://github.com/thautwarm/RBNF.hs\n    cd RBNF.hs\n    stack install .\n    ```\n\n# Example: Multiplications\n\n1. write a `multiply.rbnf` file:\n\n```\n# 'mul' is a python global which should be marked as 'required' in .rlex\nMul    : !lhs=Mul \"*\" !rhs=Atom            -> mul(lhs, rhs);\nMul    : !a=Atom                           -> a;\nAtom   : \"(\" !a=Mul \")\"                    -> a;\n\n# 'unwrap' should be marked as 'required', just as 'mul'\nAtom   : !a=<number>                       -> unwrap(a);\nSTART ::= <BOF> !a=Mul <EOF>               -> a;\n```\n\n2. write a `multiply.rlex` file:\n```\n%require mul\n%require unwrap\n%ignore space\nnumber [+-]?\\d+\nspace \\s+\n```\n\n3. codegen\n\n```shell\nsh> rbnf-pygen multiply.rbnf multiply.rlex multiply.py --k 1 --traceback\n```\n\n4. run statically-generated parsers and lexers and enjoy its efficiency\n```python\nfrom rbnf_rts.rts import Tokens, State\nfrom multiply import run_lexer, mk_parser\nimport operator\n\ndef unwrap(x: Token):\n    return int(x.value)\n\nscope = dict(mul=operator.mul, unwrap=unwrap)\n\nparse = mk_parser(**scope)\n\n\ntokens = list(run_lexer(\"<current file>\", \"-1 * 2 * (3 * 4)\"))\ngot = parse(State(), Tokens(tokens))\nprint(got)\n```\n\nGot `(True, -24)`, where `True` indicates the parsing succeeded.\n\nIf `False`, a list of errors will be given in the second element of\nthe return tuple.\n\n",
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