Statically typed BNF with semantic actions; A frontend of frontend frameworks; Use your grammar everywhere.

Overview

Typed BNF

Given a grammar:

We type inference it:

polyrule : forall 'a. ('a) -> (str, token, 'a)
polyrule2 : forall 'a. ('a) -> (str, token, 'a)

Then we can lower it to a BNF grammar used by other parser framework, no matter which programming language is the target.

Lark Backend

python -m tbnf GRAMMAR.tbnf lark [--outdir OUTDIR=.] [--mod MODULENAME=mylang]  

Antlr Backend

python -m tbnf GRAMMAR.tbnf antlr [--outdir OUTDIR=.] [--mod MODULENAME=mylang]  
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Comments
  •  use `A` for type parameters instead of `'A`

    use `A` for type parameters instead of `'A`

    This is because we want to support single quote literals such as 'x'. So far we use ANTLR backends to implement the metaparser(parser for Typed BNF itself), which makes it hard for us to achieve contextual lexing.

    opened by thautwarm 0
  • dependencies of lexer definition

    dependencies of lexer definition

    For antlr-csharp backend, such lexer rules work:

    <int> : DIGIT+
    <DIGIT> : [0 .. 9]
    

    <int> can be defined before presenting <DIGIT>, however, this will cause a compile error in ocaml-menhir+sedlex backend:

    let rule_INT_5 = [%sedlex.regexp? Plus (rule_DIGIT_4)]
    let rule_DIGIT_4 = [%sedlex.regexp? ('0' .. '9')]
    

    It's easy to resolve this order but I don't think it deserve a high priority.

    opened by thautwarm 0
Releases(0.2)
  • 0.2(Aug 7, 2022)

    > node tbnf.js  ./runtests/simple_json.tbnf -o ./runtests/julia_simple_json -lang "simple_json" -be julia-fff
    
    > node tbnf.js --help
    usage: tbnf.js [-h] [-o OUTDIR] [-lang LANGUAGE]
                   [-be {python-lark,ocaml-menhir,csharp-antlr,typescript-antlr,julia-fff,purebnf}]
                   [-conf CONFIGPATH]
                   tbnfSourcePath
    
    positional arguments:
      tbnfSourcePath
    
    optional arguments:
      -h, --help            show this help message and exit
      -o OUTDIR, --outDir OUTDIR
      -lang LANGUAGE, --language LANGUAGE
                            name of your own language
      -be {python-lark,ocaml-menhir,csharp-antlr,typescript-antlr,julia-fff,purebnf}, --backend {python-lark,ocaml-menhir,csharp-antlr,typescript-antlr,julia-fff,purebnf}
      -conf CONFIGPATH, --configPath CONFIGPATH
                            path to a config file
    
    Source code(tar.gz)
    Source code(zip)
    tbnf-linux(38.72 MB)
    tbnf-macos(44.25 MB)
    tbnf-win.exe(32.57 MB)
    tbnf.js(2.08 MB)
Owner
Taine Zhao
Taine Zhao
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