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import antlr3
import testbase
import unittest
class t010lexer(testbase.ANTLRTest):
def setUp(self):
self.compileGrammar()
def lexerClass(self, base):
class TLexer(base):
def emitErrorMessage(self, msg):
# report errors to /dev/null
pass
def reportError(self, re):
# no error recovery yet, just crash!
raise re
return TLexer
def testValid(self):
stream = antlr3.StringStream('foobar _Ab98 \n A12sdf')
lexer = self.getLexer(stream)
token = lexer.nextToken()
assert token.type == self.lexerModule.IDENTIFIER
assert token.start == 0, token.start
assert token.stop == 5, token.stop
assert token.text == 'foobar', token.text
token = lexer.nextToken()
assert token.type == self.lexerModule.WS
assert token.start == 6, token.start
assert token.stop == 6, token.stop
assert token.text == ' ', token.text
token = lexer.nextToken()
assert token.type == self.lexerModule.IDENTIFIER
assert token.start == 7, token.start
assert token.stop == 11, token.stop
assert token.text == '_Ab98', token.text
token = lexer.nextToken()
assert token.type == self.lexerModule.WS
assert token.start == 12, token.start
assert token.stop == 14, token.stop
assert token.text == ' \n ', token.text
token = lexer.nextToken()
assert token.type == self.lexerModule.IDENTIFIER
assert token.start == 15, token.start
assert token.stop == 20, token.stop
assert token.text == 'A12sdf', token.text
token = lexer.nextToken()
assert token.type == self.lexerModule.EOF
def testMalformedInput(self):
stream = antlr3.StringStream('a-b')
lexer = self.getLexer(stream)
lexer.nextToken()
try:
token = lexer.nextToken()
raise AssertionError, token
except antlr3.NoViableAltException, exc:
assert exc.unexpectedType == '-', repr(exc.unexpectedType)
assert exc.charPositionInLine == 1, repr(exc.charPositionInLine)
assert exc.line == 1, repr(exc.line)
if __name__ == '__main__':
unittest.main()
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