import unittest, pprint
from simpleparse.parser import Parser
from simpleparse.error import ParserSyntaxError

class ErrorOnFailTests( unittest.TestCase ):
	"""Tests of the error-on failure mechanisms"""
	def shouldRaise(self, definition, parserName, testValue, ):
		self.failUnlessRaises( ParserSyntaxError,  Parser( definition).parse, testValue, parserName )
	def shouldNotRaise(self, definition, parserName, testValue, ):
		success,result, next = Parser( definition).parse( testValue, parserName )
		assert success, """Didn't parse %s (error on fail test for definition %s)"""%( repr(testValue), repr(definition))
		

	def testErrorOnFail1( self ):
		self.shouldRaise(
			'''s := -trailer!
			trailer   := "bad"
			''',
			's',
			'badba',
		)
	def testErrorOnFail2( self ):
		self.shouldRaise(
			'''s := -"bad"!
			''',
			's',
			'badba',
		)
	def testErrorOnFail3( self ):
		self.shouldRaise(
			'''s := -(a,b)!
			a := "a"
			b := "b"
			''',
			's',
			'abdba',
		)
	def testErrorOnFail4( self ):
		self.shouldRaise(
			'''s := -[ab]!
			''',
			's',
			'abdba',
		)
	
	def testErrorOnFail5( self ):
		self.shouldRaise(
			'''s := !,'a','b'
			''',
			's',
			'badba',
		)
	def testErrorOnFail6( self ):
		self.shouldNotRaise(
			'''s := 'a',!,'b'
			''',
			's',
			'abdba',
		)
	def testErrorOnFail7( self ):
		self.shouldNotRaise(
			'''s := 'a',!,'b'?
			''',
			's',
			'acbdba',
		)
	def testErrorOnFail8( self ):
		self.shouldRaise(
			'''s := 'a',!,'b'
			''',
			's',
			'acbdba',
		)
	def testErrorOnFail9( self ):
		self.shouldRaise(
			'''s := !,'a','b'
			''',
			's',
			'bcbdba',
		)
	def testErrorOnFail10( self ):
		"""Test for use of setting message in definition"""
		self.shouldRaise(
			'''s := 'a',! "Blargh!",'b'
			''',
			's',
			'acbdba',
		)
	def testErrorOnFail11( self ):
		"""Test proper setting of err message text from !"message" syntax"""
		try:
			Parser( '''s := 'a',! "Blargh!",'b'
				''', 's' ).parse(
				'acbdba',
			)
		except ParserSyntaxError, err:
			assert err.args[0] == "Blargh!", """Error message was %r, should have been "Blargh!"."""%(err.args[0],)
	def testErrorOnFail12( self ):
		"""Test proper setting of err message text from !"message" syntax"""
		try:
			Parser( '''s := 'a',! "Blargh!",'b'
				''', 's' ).parse(
				'acbdba',
			)
		except ParserSyntaxError, err:
			description = str( err )
			assert description == 'ParserSyntaxError: Blargh!', """Didn't get expected error description, got: %s"""%(
				str(err),
			)

def getSuite():
	return unittest.makeSuite(ErrorOnFailTests,'test')

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