def init_clp():
parser = argparse.ArgumentParser(
description='parses a grammar and validates syntatically user entries.')
parser.add_argument('-g', '--grammar', metavar='grammar', type=str,
help='the grammar file to be parsed.', dest='grammar', required=True)
parser.add_argument('-f', '--file', metavar='source', type=str, dest='source',
help='path to file containing the source code to be validated')
return parser
if __name__ == '__main__':
parser = init_clp()
args = parser.parse_args()
source = sys.stdin
lexer_g = grammar_parse.create_lexer()
with open(args.grammar) as grammar_input:
g_token_stream = lexer_g.lex_input(grammar_input.read())
grammar_ast = grammar_parse.parse_grammar(g_token_stream)
print(str(grammar_ast))
g = Grammar()
g.load_from_ast(grammar_ast)
if args.source != None:
with open(args.source) as code:
s_token_stream = g.lexer.lex_input(code.read())
parse_grammar(g, s_token_stream)
else:
parse_grammar(g, g.lexer.lex_input(sys.stdin.read()))
