import re import sys import unittest sys.path.insert(0, '..') from pycparser.c_lexer import CLexer def token_list(clex): return list(iter(clex.token, None)) def token_types(clex): return [i.type for i in token_list(clex)] class TestCLexerNoErrors(unittest.TestCase): """ Test lexing of strings that are not supposed to cause errors. Therefore, the error_func passed to the lexer raises an exception. """ def error_func(self, msg, line, column): self.fail(msg) def on_lbrace_func(self): pass def on_rbrace_func(self): pass def type_lookup_func(self, typ): if typ.startswith('mytype'): return True else: return False def setUp(self): self.clex = CLexer(self.error_func, lambda: None, lambda: None, self.type_lookup_func) self.clex.build(optimize=False) def assertTokensTypes(self, str, types): self.clex.input(str) self.assertEqual(token_types(self.clex), types) def test_trivial_tokens(self): self.assertTokensTypes('1', ['INT_CONST_DEC']) self.assertTokensTypes('-', ['MINUS']) self.assertTokensTypes('volatile', ['VOLATILE']) self.assertTokensTypes('...', ['ELLIPSIS']) self.assertTokensTypes('++', ['PLUSPLUS']) self.assertTokensTypes('case int', ['CASE', 'INT']) self.assertTokensTypes('caseint', ['ID']) self.assertTokensTypes('$dollar cent$', ['ID', 'ID']) self.assertTokensTypes('i ^= 1;', ['ID', 'XOREQUAL', 'INT_CONST_DEC', 'SEMI']) def test_id_typeid(self): self.assertTokensTypes('myt', ['ID']) self.assertTokensTypes('mytype', ['TYPEID']) self.assertTokensTypes('mytype6 var', ['TYPEID', 'ID']) def test_integer_constants(self): self.assertTokensTypes('12', ['INT_CONST_DEC']) self.assertTokensTypes('12u', ['INT_CONST_DEC']) self.assertTokensTypes('12l', ['INT_CONST_DEC']) self.assertTokensTypes('199872Ul', ['INT_CONST_DEC']) self.assertTokensTypes('199872lU', ['INT_CONST_DEC']) self.assertTokensTypes('199872LL', ['INT_CONST_DEC']) self.assertTokensTypes('199872ull', ['INT_CONST_DEC']) self.assertTokensTypes('199872llu', ['INT_CONST_DEC']) self.assertTokensTypes('1009843200000uLL', ['INT_CONST_DEC']) self.assertTokensTypes('1009843200000LLu', ['INT_CONST_DEC']) self.assertTokensTypes('077', ['INT_CONST_OCT']) self.assertTokensTypes('0123456L', ['INT_CONST_OCT']) self.assertTokensTypes('0xf7', ['INT_CONST_HEX']) self.assertTokensTypes('0b110', ['INT_CONST_BIN']) self.assertTokensTypes('0x01202AAbbf7Ul', ['INT_CONST_HEX']) self.assertTokensTypes("'12'", ['INT_CONST_CHAR']) self.assertTokensTypes("'123'", ['INT_CONST_CHAR']) self.assertTokensTypes("'1AB4'", ['INT_CONST_CHAR']) self.assertTokensTypes(r"'1A\n4'", ['INT_CONST_CHAR']) # no 0 before x, so ID catches it self.assertTokensTypes('xf7', ['ID']) # - is MINUS, the rest a constnant self.assertTokensTypes('-1', ['MINUS', 'INT_CONST_DEC']) def test_special_names(self): self.assertTokensTypes('sizeof offsetof', ['SIZEOF', 'OFFSETOF']) def test_floating_constants(self): self.assertTokensTypes('1.5f', ['FLOAT_CONST']) self.assertTokensTypes('01.5', ['FLOAT_CONST']) self.assertTokensTypes('.15L', ['FLOAT_CONST']) self.assertTokensTypes('0.', ['FLOAT_CONST']) # but just a period is a period self.assertTokensTypes('.', ['PERIOD']) self.assertTokensTypes('3.3e-3', ['FLOAT_CONST']) self.assertTokensTypes('.7e25L', ['FLOAT_CONST']) self.assertTokensTypes('6.e+125f', ['FLOAT_CONST']) self.assertTokensTypes('666e666', ['FLOAT_CONST']) self.assertTokensTypes('00666e+3', ['FLOAT_CONST']) # but this is a hex integer + 3 self.assertTokensTypes('0x0666e+3', ['INT_CONST_HEX', 'PLUS', 'INT_CONST_DEC']) def test_hexadecimal_floating_constants(self): self.assertTokensTypes('0xDE.488641p0', ['HEX_FLOAT_CONST']) self.assertTokensTypes('0x.488641p0', ['HEX_FLOAT_CONST']) self.assertTokensTypes('0X12.P0', ['HEX_FLOAT_CONST']) def test_char_constants(self): self.assertTokensTypes(r"""'x'""", ['CHAR_CONST']) self.assertTokensTypes(r"""L'x'""", ['WCHAR_CONST']) self.assertTokensTypes(r"""'\t'""", ['CHAR_CONST']) self.assertTokensTypes(r"""'\''""", ['CHAR_CONST']) self.assertTokensTypes(r"""'\?'""", ['CHAR_CONST']) self.assertTokensTypes(r"""'\0'""", ['CHAR_CONST']) self.assertTokensTypes(r"""'\012'""", ['CHAR_CONST']) self.assertTokensTypes(r"""'\x2f'""", ['CHAR_CONST']) self.assertTokensTypes(r"""'\x2f12'""", ['CHAR_CONST']) self.assertTokensTypes(r"""L'\xaf'""", ['WCHAR_CONST']) def test_on_rbrace_lbrace(self): braces = [] def on_lbrace(): braces.append('{') def on_rbrace(): braces.append('}') clex = CLexer(self.error_func, on_lbrace, on_rbrace, self.type_lookup_func) clex.build(optimize=False) clex.input('hello { there } } and again }}{') token_list(clex) self.assertEqual(braces, ['{', '}', '}', '}', '}', '{']) def test_string_literal(self): self.assertTokensTypes('"a string"', ['STRING_LITERAL']) self.assertTokensTypes('L"ing"', ['WSTRING_LITERAL']) self.assertTokensTypes( '"i am a string too \t"', ['STRING_LITERAL']) self.assertTokensTypes( r'''"esc\ape \"\'\? \0234 chars \rule"''', ['STRING_LITERAL']) self.assertTokensTypes( r'''"hello 'joe' wanna give it a \"go\"?"''', ['STRING_LITERAL']) self.assertTokensTypes( '"\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123"', ['STRING_LITERAL']) # Note: a-zA-Z and '.-~^_!=&;,' are allowed as escape chars to support #line # directives with Windows paths as filenames (..\..\dir\file) self.assertTokensTypes( r'"\x"', ['STRING_LITERAL']) self.assertTokensTypes( r'"\a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z\A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z"', ['STRING_LITERAL']) self.assertTokensTypes( r'"C:\x\fa\x1e\xited"', ['STRING_LITERAL']) # The lexer is permissive and allows decimal escapes (not just octal) self.assertTokensTypes( '"jx\9"', ['STRING_LITERAL']) self.assertTokensTypes( '"fo\9999999"', ['STRING_LITERAL']) def test_mess(self): self.assertTokensTypes( r'[{}]()', ['LBRACKET', 'LBRACE', 'RBRACE', 'RBRACKET', 'LPAREN', 'RPAREN']) self.assertTokensTypes( r'()||!C&~Z?J', ['LPAREN', 'RPAREN', 'LOR', 'LNOT', 'ID', 'AND', 'NOT', 'ID', 'CONDOP', 'ID']) self.assertTokensTypes( r'+-*/%|||&&&^><>=<===!=', ['PLUS', 'MINUS', 'TIMES', 'DIVIDE', 'MOD', 'LOR', 'OR', 'LAND', 'AND', 'XOR', 'GT', 'LT', 'GE', 'LE', 'EQ', 'NE']) self.assertTokensTypes( r'++--->?.,;:', ['PLUSPLUS', 'MINUSMINUS', 'ARROW', 'CONDOP', 'PERIOD', 'COMMA', 'SEMI', 'COLON']) def test_exprs(self): self.assertTokensTypes( 'bb-cc', ['ID', 'MINUS', 'ID']) self.assertTokensTypes( 'foo & 0xFF', ['ID', 'AND', 'INT_CONST_HEX']) self.assertTokensTypes( '(2+k) * 62', ['LPAREN', 'INT_CONST_DEC', 'PLUS', 'ID', 'RPAREN', 'TIMES', 'INT_CONST_DEC'],) self.assertTokensTypes( 'x | y >> z', ['ID', 'OR', 'ID', 'RSHIFT', 'ID']) self.assertTokensTypes( 'x <<= z << 5', ['ID', 'LSHIFTEQUAL', 'ID', 'LSHIFT', 'INT_CONST_DEC']) self.assertTokensTypes( 'x = y > 0 ? y : -6', ['ID', 'EQUALS', 'ID', 'GT', 'INT_CONST_OCT', 'CONDOP', 'ID', 'COLON', 'MINUS', 'INT_CONST_DEC']) self.assertTokensTypes( 'a+++b', ['ID', 'PLUSPLUS', 'PLUS', 'ID']) def test_statements(self): self.assertTokensTypes( 'for (int i = 0; i < n; ++i)', ['FOR', 'LPAREN', 'INT', 'ID', 'EQUALS', 'INT_CONST_OCT', 'SEMI', 'ID', 'LT', 'ID', 'SEMI', 'PLUSPLUS', 'ID', 'RPAREN']) self.assertTokensTypes( 'self: goto self;', ['ID', 'COLON', 'GOTO', 'ID', 'SEMI']) self.assertTokensTypes( """ switch (typ) { case TYPE_ID: m = 5; break; default: m = 8; }""", ['SWITCH', 'LPAREN', 'ID', 'RPAREN', 'LBRACE', 'CASE', 'ID', 'COLON', 'ID', 'EQUALS', 'INT_CONST_DEC', 'SEMI', 'BREAK', 'SEMI', 'DEFAULT', 'COLON', 'ID', 'EQUALS', 'INT_CONST_DEC', 'SEMI', 'RBRACE']) def test_preprocessor_line(self): self.assertTokensTypes('#abracadabra', ['PPHASH', 'ID']) str = r""" 546 #line 66 "kwas\df.h" id 4 dsf # 9 armo #line 10 "..\~..\test.h" tok1 #line 99999 "include/me.h" tok2 """ #~ self.clex.filename self.clex.input(str) self.clex.reset_lineno() t1 = self.clex.token() self.assertEqual(t1.type, 'INT_CONST_DEC') self.assertEqual(t1.lineno, 2) t2 = self.clex.token() self.assertEqual(t2.type, 'ID') self.assertEqual(t2.value, 'id') self.assertEqual(t2.lineno, 66) self.assertEqual(self.clex.filename, r'kwas\df.h') for i in range(3): t = self.clex.token() self.assertEqual(t.type, 'ID') self.assertEqual(t.value, 'armo') self.assertEqual(t.lineno, 9) self.assertEqual(self.clex.filename, r'kwas\df.h') t4 = self.clex.token() self.assertEqual(t4.type, 'ID') self.assertEqual(t4.value, 'tok1') self.assertEqual(t4.lineno, 10) self.assertEqual(self.clex.filename, r'..\~..\test.h') t5 = self.clex.token() self.assertEqual(t5.type, 'ID') self.assertEqual(t5.value, 'tok2') self.assertEqual(t5.lineno, 99999) self.assertEqual(self.clex.filename, r'include/me.h') def test_preprocessor_line_funny(self): str = r''' #line 10 "..\6\joe.h" 10 ''' self.clex.input(str) self.clex.reset_lineno() t1 = self.clex.token() self.assertEqual(t1.type, 'INT_CONST_DEC') self.assertEqual(t1.lineno, 10) self.assertEqual(self.clex.filename, r'..\6\joe.h') def test_preprocessor_pragma(self): str = ''' 42 #pragma #pragma helo me #pragma once # pragma omp parallel private(th_id) #\tpragma {pack: 2, smack: 3} #pragma "nowit.h" #pragma "string" #pragma somestring="some_other_string" #pragma id 124124 and numbers 0235495 59 ''' # Check that pragmas are tokenized, including trailing string self.clex.input(str) self.clex.reset_lineno() t1 = self.clex.token() self.assertEqual(t1.type, 'INT_CONST_DEC') t2 = self.clex.token() self.assertEqual(t2.type, 'PPPRAGMA') t3 = self.clex.token() self.assertEqual(t3.type, 'PPPRAGMA') t4 = self.clex.token() self.assertEqual(t4.type, 'PPPRAGMASTR') self.assertEqual(t4.value, 'helo me') for i in range(3): t = self.clex.token() t5 = self.clex.token() self.assertEqual(t5.type, 'PPPRAGMASTR') self.assertEqual(t5.value, 'omp parallel private(th_id)') for i in range(5): ta = self.clex.token() self.assertEqual(ta.type, 'PPPRAGMA') tb = self.clex.token() self.assertEqual(tb.type, 'PPPRAGMASTR') t6 = self.clex.token() self.assertEqual(t6.type, 'INT_CONST_DEC') self.assertEqual(t6.lineno, 12) # Keeps all the errors the lexer spits in one place, to allow # easier modification if the error syntax changes. # ERR_ILLEGAL_CHAR = 'Illegal character' ERR_OCTAL = 'Invalid octal constant' ERR_UNMATCHED_QUOTE = 'Unmatched \'' ERR_INVALID_CCONST = 'Invalid char constant' ERR_STRING_ESCAPE = 'String contains invalid escape' ERR_FILENAME_BEFORE_LINE = 'filename before line' ERR_LINENUM_MISSING = 'line number missing' ERR_INVALID_LINE_DIRECTIVE = 'invalid #line directive' class TestCLexerErrors(unittest.TestCase): """ Test lexing of erroneous strings. Works by passing an error functions that saves the error in an attribute for later perusal. """ def error_func(self, msg, line, column): self.error = msg def on_lbrace_func(self): pass def on_rbrace_func(self): pass def type_lookup_func(self, typ): return False def setUp(self): self.clex = CLexer(self.error_func, self.on_lbrace_func, self.on_rbrace_func, self.type_lookup_func) self.clex.build(optimize=False) self.error = "" def assertLexerError(self, str, error_like): # feed the string to the lexer self.clex.input(str) # Pulls all tokens from the string. Errors will # be written into self.error by the error_func # callback # token_types(self.clex) # compare the error to the expected self.assertTrue(re.search(error_like, self.error), "\nExpected error matching: %s\nGot: %s" % (error_like, self.error)) # clear last error, for the sake of subsequent invocations self.error = "" def test_trivial_tokens(self): self.assertLexerError('@', ERR_ILLEGAL_CHAR) self.assertLexerError('`', ERR_ILLEGAL_CHAR) self.assertLexerError('\\', ERR_ILLEGAL_CHAR) def test_integer_constants(self): self.assertLexerError('029', ERR_OCTAL) self.assertLexerError('012345678', ERR_OCTAL) def test_char_constants(self): self.assertLexerError("'", ERR_UNMATCHED_QUOTE) self.assertLexerError("'b\n", ERR_UNMATCHED_QUOTE) self.assertLexerError("'\\xaa\n'", ERR_UNMATCHED_QUOTE) self.assertLexerError(r"'123\12a'", ERR_INVALID_CCONST) self.assertLexerError(r"'123\xabg'", ERR_INVALID_CCONST) self.assertLexerError("''", ERR_INVALID_CCONST) self.assertLexerError("'abcjx'", ERR_INVALID_CCONST) self.assertLexerError(r"'\*'", ERR_INVALID_CCONST) def test_string_literals(self): self.assertLexerError(r'"jx\`"', ERR_STRING_ESCAPE) self.assertLexerError(r'"hekllo\* on ix"', ERR_STRING_ESCAPE) self.assertLexerError(r'L"hekllo\* on ix"', ERR_STRING_ESCAPE) # Should not suffer from slow backtracking self.assertLexerError(r'"\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\`\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123"', ERR_STRING_ESCAPE) self.assertLexerError(r'"\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\x23\`\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23\xf1\x23"', ERR_STRING_ESCAPE) # Should not suffer from slow backtracking when there's no end quote self.assertLexerError(r'"\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\`\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\123\12\123456', ERR_ILLEGAL_CHAR) self.assertLexerError(r'"\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\`\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x23\x2\x23456', ERR_ILLEGAL_CHAR) def test_preprocessor(self): self.assertLexerError('#line "ka"', ERR_FILENAME_BEFORE_LINE) self.assertLexerError('#line df', ERR_INVALID_LINE_DIRECTIVE) self.assertLexerError('#line \n', ERR_LINENUM_MISSING) if __name__ == '__main__': unittest.main()