# tokenizer.py
#
# Copyright 2021 James Westman <james@jwestman.net>
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: LGPL-3.0-or-later


import unittest

from gtkblueprinttool.errors import PrintableError
from gtkblueprinttool.tokenizer import Token, TokenType, tokenize


class TestTokenizer(unittest.TestCase):
    def assert_tokenize(self, string: str, expect: [Token]):
        try:
            tokens = tokenize(string)
            self.assertEqual(len(tokens), len(expect))
            for token, (type, token_str) in zip(tokens, expect):
                self.assertEqual(token.type, type)
                self.assertEqual(str(token), token_str)
        except PrintableError as e:
            e.pretty_print("<test input>", string)
            raise e


    def test_basic(self):
        self.assert_tokenize("ident(){}; \n <<+>>*/=", [
            (TokenType.IDENT, "ident"),
            (TokenType.OPEN_PAREN, "("),
            (TokenType.CLOSE_PAREN, ")"),
            (TokenType.OPEN_BLOCK, "{"),
            (TokenType.CLOSE_BLOCK, "}"),
            (TokenType.STMT_END, ";"),
            (TokenType.WHITESPACE, " \n "),
            (TokenType.OP, "<<+>>*/="),
            (TokenType.EOF, ""),
        ])

    def test_quotes(self):
        self.assert_tokenize(r'"this is a \n string""this is \\another \"string\""', [
            (TokenType.QUOTED, r'"this is a \n string"'),
            (TokenType.QUOTED, r'"this is \\another \"string\""'),
            (TokenType.EOF, ""),
        ])

    def test_comments(self):
        self.assert_tokenize('/* \n \\n COMMENT /* */', [
            (TokenType.COMMENT, '/* \n \\n COMMENT /* */'),
            (TokenType.EOF, ""),
        ])
        self.assert_tokenize('line // comment\nline', [
            (TokenType.IDENT, 'line'),
            (TokenType.WHITESPACE, ' '),
            (TokenType.COMMENT, '// comment'),
            (TokenType.WHITESPACE, '\n'),
            (TokenType.IDENT, 'line'),
            (TokenType.EOF, ""),
        ])


if __name__ == "__main__":
    unittest.main()