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#!/usr/bin/env python3
import io
import base, unittest
from ptk.lexer import LexerError, token, EOF, LexerPosition
from ptk.lexer import ProgressiveLexer, ReLexer
class LexerUnderTestMixin(object):
def __init__(self, testCase):
self.testCase = testCase
super().__init__()
def newToken(self, tok):
self.testCase.feed(tok)
def deferNewToken(self, tok):
self.testCase.feed(tok)
from twisted.internet.defer import succeed
return succeed(None)
class LexerTestCase(unittest.TestCase):
def setUp(self):
self.tokens = list()
def feed(self, tok):
if tok is EOF:
self.tokens = tuple(self.tokens) # So that any more tokens will raise an exception
else:
self.tokens.append(tok)
def doLex(self, inputString):
self.lexer.parse(inputString)
return self.tokens
class ProgressiveLexerTestCase(LexerTestCase):
lexerClass = ProgressiveLexer
class ReLexerTestCase(LexerTestCase):
lexerClass = ReLexer
class LexerBasicTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('[a-zA-Z]+')
def ID(self, tok):
pass
@token('[0-9]+')
def NUMBER(self, tok):
tok.value = int(tok.value)
@token('\n', types=[EOF])
def EOL(self, tok):
tok.type = EOF
@token('0x[a-fA-F0-9]+', types=['NUMBER'])
def HEX(self, tok):
tok.type = 'NUMBER'
tok.value = int(tok.value, 16)
@token(r'\+\+')
def INC(self, tok):
tok.type = None
self.lexer = TestedLexer(self)
def test_single(self):
token, = self.doLex('abc')
self.assertEqual((token.type, token.value), ('ID', 'abc'))
def test_ignore_leading(self):
token, = self.doLex(' abc')
self.assertEqual((token.type, token.value), ('ID', 'abc'))
def test_ignore_middle(self):
tok1, tok2 = self.doLex('a bc')
self.assertEqual((tok1.type, tok1.value), ('ID', 'a'))
self.assertEqual((tok2.type, tok2.value), ('ID', 'bc'))
def test_ignore_trailing(self):
token, = self.doLex('abc ')
self.assertEqual((token.type, token.value), ('ID', 'abc'))
def test_value(self):
token, = self.doLex('42')
self.assertEqual((token.type, token.value), ('NUMBER', 42))
def test_forced_value_eof(self):
token, = self.doLex('abc\n')
self.assertEqual((token.type, token.value), ('ID', 'abc'))
def test_forced_value(self):
token, = self.doLex('0xf')
self.assertEqual((token.type, token.value), ('NUMBER', 15))
def test_ignore(self):
tok1, tok2 = self.doLex('a++b')
self.assertEqual((tok1.type, tok1.value), ('ID', 'a'))
self.assertEqual((tok2.type, tok2.value), ('ID', 'b'))
def test_tokenvalues(self):
self.assertEqual(self.lexer.tokenTypes(), set(['ID', 'NUMBER', 'INC']))
class ProgressiveLexerBasicTestCase(LexerBasicTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerBasicTestCase(LexerBasicTestCaseMixin, ReLexerTestCase):
pass
class PositionTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@staticmethod
def ignore(char):
return char in [' ', '\n']
@token('[a-z]+')
def identifier(self, tok):
pass
self.lexer = TestedLexer(testCase=self)
def test_error_position(self):
try:
self.doLex('ab\ncd0aa')
except LexerError as exc:
self.assertEqual(exc.lineno, 2)
self.assertEqual(exc.colno, 3)
else:
self.fail()
def test_token_positions(self):
tok1, tok2 = self.doLex('ab\n int')
self.assertEqual(tok1.position, LexerPosition(column=1, line=1))
self.assertEqual(tok2.position, LexerPosition(column=3, line=2))
class ProgressiveLexerPositionTestCase(PositionTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerPositionTestCase(PositionTestCaseMixin, ReLexerTestCase):
pass
class TokenTypeTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(self.lexerClass):
def __init__(self, testCase):
self.testCase = testCase
super().__init__()
@token('[a-z]', types=['LETTER'])
def letter(self, tok):
self.testCase.assertTrue(tok.type is None)
def newToken(self, tok):
pass
self.lexer = TestedLexer(self)
def test_none(self):
self.doLex('a')
def test_funcname(self):
self.assertFalse('letter' in self.lexer.tokenTypes())
def test_types(self):
self.assertTrue('LETTER' in self.lexer.tokenTypes())
class ProgressiveLexerTokenTypeTestCase(TokenTypeTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerTokenTypeTestCase(TokenTypeTestCaseMixin, ReLexerTestCase):
pass
class LexerByteTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token(b'[a-zA-Z]+')
def ID(self, tok):
pass
self.lexer = TestedLexer(self)
def test_byte_regex_gives_byte_token_value(self):
tok, = self.doLex(b'foo')
self.assertTrue(isinstance(tok.value, bytes))
class ProgressiveLexerByteTestCase(LexerByteTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerByteTestCase(LexerByteTestCaseMixin, ReLexerTestCase):
pass
class LexerUnicodeTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('[a-zA-Z]+')
def ID(self, tok):
pass
self.lexer = TestedLexer(self)
def test_unicode_regex_gives_unicode_token_value(self):
tok, = self.doLex('foo')
self.assertTrue(isinstance(tok.value, str))
class ProgressiveLexerUnicodeTestCase(LexerUnicodeTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerUnicodeTestCase(LexerUnicodeTestCaseMixin, ReLexerTestCase):
pass
class LexerUnambiguousTestCase(ProgressiveLexerTestCase):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('a')
def ID(self, tok):
pass
self.lexer = TestedLexer(self)
def test_unambiguous(self):
# If we arrive in a final state without any outgoing transition, it should be an instant match.
self.lexer.feed('a')
token, = self.tokens
self.assertEqual((token.type, token.value), ('ID', 'a'))
class LexerConsumerTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('[a-zA-Z0-9]+')
def ID(self, tok):
pass
@token('"')
def STR(self, tok):
class StringBuilder(object):
def __init__(self):
self.value = io.StringIO()
self.state = 0
def feed(self, char):
if self.state == 0:
if char == '\\':
self.state = 1
elif char == '"':
return 'STR', self.value.getvalue()
else:
self.value.write(char)
elif self.state == 1:
self.value.write(char)
self.state = 0
self.setConsumer(StringBuilder())
self.lexer = TestedLexer(self)
def test_string(self):
tok1, tok2, tok3 = self.doLex(r'ab"foo\"spam"eggs')
self.assertEqual((tok1.type, tok1.value), ('ID', 'ab'))
self.assertEqual((tok2.type, tok2.value), ('STR', 'foo"spam'))
self.assertEqual((tok3.type, tok3.value), ('ID', 'eggs'))
class ProgressiveLexerConsumerTestCase(LexerConsumerTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerConsumerTestCase(LexerConsumerTestCaseMixin, ReLexerTestCase):
pass
class LexerDuplicateTokenNameTestCaseMixin(object):
def test_dup(self):
try:
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('a')
def ID(self, tok):
pass
@token('b')
def ID(self, tok):
pass
except TypeError:
pass
else:
self.fail()
class ProgressiveLexerDuplicateTokenNameTestCase(LexerDuplicateTokenNameTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerDuplicateTokenNameTestCase(LexerDuplicateTokenNameTestCaseMixin, ReLexerTestCase):
pass
class LexerInheritanceTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('[0-9]')
def digit(self, tok):
pass
class ChildLexer(TestedLexer):
def digit(self, tok):
tok.value = int(tok.value)
self.lexer = ChildLexer(self)
def test_inherit(self):
token, = self.doLex('4')
self.assertEqual((token.type, token.value), ('digit', 4))
class ProgressiveLexerInheritanceTestCase(LexerInheritanceTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerInheritanceTestCase(LexerInheritanceTestCaseMixin, ReLexerTestCase):
pass
class LexerUnterminatedTokenTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('abc')
def ID(self, tok):
pass
self.lexer = TestedLexer(self)
def test_simple(self):
token, = self.doLex('abc')
self.assertEqual((token.type, token.value), ('ID', 'abc'))
def test_unterminated(self):
try:
self.doLex('ab')
except LexerError:
pass
else:
self.fail()
class ProgressiveLexerUnterminatedTokenTestCase(LexerUnterminatedTokenTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerUnterminatedTokenTestCase(LexerUnterminatedTokenTestCaseMixin, ReLexerTestCase):
pass
class LexerLengthTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('<|=')
def LT(self, tok):
pass
@token('<=')
def LTE(self, tok):
pass
self.lexer = TestedLexer(self)
def test_longest(self):
token, = self.doLex('<=')
self.assertEqual((token.type, token.value), ('LTE', '<='))
class ProgressiveLexerLengthTestCase(LexerLengthTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerLengthTestCase(LexerLengthTestCaseMixin, ReLexerTestCase):
pass
class LexerPriorityTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('a|b')
def A(self, tok):
pass
@token('b|c')
def B(self, tok):
pass
self.lexer = TestedLexer(self)
def test_priority(self):
token, = self.doLex('b')
self.assertEqual((token.type, token.value), ('A', 'b'))
class ProgressiveLexerPriorityTestCase(LexerPriorityTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerPriorityTestCase(LexerPriorityTestCaseMixin, ReLexerTestCase):
pass
class LexerRemainingCharactersTestCase(ProgressiveLexerTestCase):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token('abc')
def ID1(self, tok):
pass
@token('aba')
def ID2(self, tok):
pass
self.lexer = TestedLexer(self)
def test_remain(self):
t1, t2 = self.doLex('abaaba')
self.assertEqual((t1.type, t1.value), ('ID2', 'aba'))
self.assertEqual((t2.type, t2.value), ('ID2', 'aba'))
class LexerEOFTestCaseMixin(object):
def setUp(self):
super().setUp()
class TestedLexer(LexerUnderTestMixin, self.lexerClass):
@token(r'[0-9]+')
def NUMBER(self, tok):
tok.value = int(tok.value)
@token(r'\n')
def EOL(self, tok):
tok.type = EOF
self.lexer = TestedLexer(self)
def test_eol_is_eof(self):
self.lexer.parse('42\n')
self.assertTrue(isinstance(self.tokens, tuple))
class ProgressiveLexerEOFTestCase(LexerEOFTestCaseMixin, ProgressiveLexerTestCase):
pass
class ReLexerEOFTestCase(LexerEOFTestCaseMixin, ReLexerTestCase):
pass
if __name__ == '__main__':
unittest.main()
|
