agtest/agmain.py

import textwrap
import os
import json
import importlib
from lark import Lark

from agast import *
from aggen import *

p = Lark(open("grammar.lark").read(), start="program", parser="lalr")

if __name__ == "__main__":
    with open("test/arith.ag") as f:
        data = f.read()

    cst = p.parse(data)

    trans = Parser()
    ast = trans.transform(cst)

    res = gen(ast)
    print("Grammar:")
    print(res.parser_data)

    if not os.path.exists("gen"):
        os.makedirs("gen")
    with open("gen/arith.py", "w") as f:
        fmt_str = open("agruntime.tmpl.py", "r").read()
        f.write(
            fmt_str.format(
                pd=res.parser_data,
                ex=res.extra,
                starts=list(res.starts),
                transdef=res.transdef,
                ntmap=json.dumps(res.nonterminal_map),
            )
        )

    mod = importlib.import_module("gen.arith")
    print(mod.parse("1 + 2 * 3", start="Expr"))  # type: ignore