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

Last update: Dec 14, 2022

Related tags

Overview

Typed BNF

Given a grammar:

shape token {
    lexeme : str
}
polyrule  :    { fn (a) -> ($1.lexeme, $2, a) }
polyrule2 :  polyrule { fn (a) -> $2(a) }

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`

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
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)

0.1(Aug 6, 2022)

Source code(tar.gz)
Source code(zip)
tbnf.js(1.99 MB)

Owner

Taine Zhao

GitHub

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