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#!/usr/bin/env python3
"""jsparagus/main.py - Generate a parser from a pgen grammar.
(This is for testing. pgen will likely go away. Ignore this for now.)
"""
import sys
import argparse
from . import parse_pgen
from . import gen
def main():
parser = argparse.ArgumentParser(description="Generate a parser.")
parser.add_argument('--target', choices=['python', 'rust'], default='rust',
help="target language to use when printing the parser tables")
parser.add_argument('grammar', metavar='FILE', nargs=1,
help=".pgen file containing the grammar")
options = parser.parse_args()
[pgen_filename] = options.grammar
grammar = parse_pgen.load_grammar(pgen_filename)
gen.generate_parser(sys.stdout, grammar, target=options.target)
if __name__ == '__main__':
main()