def matchFactor(self, tokenName, tokenNameNeed=None):
if (self.tokenList.token.tokenName) == tokenName:
print(
Style.green('Line({})-Pass '.format(self.tokenList.token.line))
+ Style.reset('token {}'.format(self.tokenList.token)))
self.tokenList.nextToken()
else:
if (tokenNameNeed):
print(
Style.red('Line({})-Pass Error '.format(
self.tokenList.token.line)) +
Style.reset('{} required.'.format(tokenNameNeed)))
else:
print(
Style.red('Line({})-Pass Error '.format(
self.tokenList.token.line)) +
Style.reset('{} required.'.format(tokenName)))
def match(self, tokenAttributeValue):
if (self.tokenList.token.attributeValue) == tokenAttributeValue:
print(
Style.green('Line({})-Match '.format(
self.tokenList.token.line)) + 'token ({} {} {}) '.format(
self.tokenList.token, Style.green('with'),
tokenAttributeValue))
self.tokenList.nextToken()
else:
print(
Style.red('Line({})-Syntax Error '.format(
self.tokenList.token.line)) +
Style.reset('{} required.'.format(tokenAttributeValue)))
def stmt(self):
#grammer rule stmt --> eof
if (self.tokenList.token.tokenName == 'eof'):
return
#grammer rule stmt --> if ( expr ) stmt
if (self.tokenList.token.attributeValue == 'if'):
self.match('if')
self.match('leftparantheses')
self.expr()
self.match('rightparantheses')
self.match('leftbracket')
self.stmt()
self.match('rightbracket')
self.stmt()
#grammer rule stmt --> while ( expr ) stmt
elif (self.tokenList.token.attributeValue == 'while'):
self.match('while')
self.match('leftparantheses')
self.expr()
self.match('rightparantheses')
self.stmt()
#grammer rule stmt --> for ( optexpr; optexpr; optexpr ) stmt
elif (self.tokenList.token.attributeValue == 'for'):
self.match('for')
self.match('leftparantheses')
self.optexpr()
self.match('semicolon')
self.optexpr()
self.match('semicolon')
self.optexpr()
self.match('rightparantheses')
self.stmt()
#grammer rule stmt --> { stmts } stmts
elif (self.tokenList.token.attributeValue == 'leftbracket'):
self.match('leftbracket')
self.stmts()
self.match('rightbracket')
self.stmt()
#grammer rule stmt --> # include < identifier .identifier? > stmt
elif (self.tokenList.token.attributeValue == 'sharp'):
self.match('sharp')
self.match('include')
self.match('LT')
self.matchFactor('identifier')
if (self.tokenList.token.tokenName == 'dot'):
self.matchFactor('dot')
self.matchFactor('identifier')
self.match('GT')
self.stmt()
#grammer rule stmt --> do stmt while ( expr ); stmt
elif (self.tokenList.token.attributeValue == 'do'):
self.match('do')
self.stmt()
self.match('while')
self.match('leftparantheses')
self.expr()
self.match('rightparantheses')
self.match('semicolon')
self.stmt()
#grammer rule stmt --> type identifier ( params ) stmt
#grammer rule stmt --> type identifier [ number ]; stmt
#grammer rule stmt --> type identifier = expr; stmt
elif (re.search('int|float|double',
self.tokenList.token.attributeValue)):
self.match(self.tokenList.token.attributeValue)
self.matchFactor('identifier')
if (self.tokenList.token.attributeValue == 'leftparantheses'):
self.match('leftparantheses')
self.params()
self.match('rightparantheses')
self.stmt()
elif (self.tokenList.token.attributeValue == 'leftsqurebracket'):
self.match('leftsqurebracket')
self.matchFactor('number')
self.match('rightsqurebracket')
if (self.tokenList.token.attributeValue == 'EQ'):
self.match('EQ')
self.match('leftbracket')
self.arrayNumber()
self.match('rightbracket')
self.match('semicolon')
self.stmt()
else:
self.match('semicolon')
self.stmt()
elif (self.tokenList.token.attributeValue == 'EQ'):
self.match('EQ')
self.expr()
self.match('semicolon')
self.stmt()
else:
self.match('semicolon')
self.stmt()
#grammer rule stmt --> void identifier ( params ) stmt
elif (self.tokenList.token.attributeValue == 'void'):
self.match('void')
self.matchFactor('identifier')
self.match('leftparantheses')
self.params()
self.match('rightparantheses')
self.stmt()
#grammer rule stmt --> return expr ; stmt
elif (self.tokenList.token.attributeValue == 'return'):
self.match('return')
self.expr()
self.match('semicolon')
self.stmt()
#grammer rule stmt --> identifier = expr ; stmt
elif (self.tokenList.token.tokenName == 'identifier'):
self.matchFactor('identifier')
self.match('EQ')
self.expr()
self.match('semicolon')
self.stmt()
#grammer rule stmt --> cout coutState stmt
elif (self.tokenList.token.attributeValue == 'cout'):
self.match('cout')
self.coutState()
self.stmt()
#grammer rule stmt --> cin cinState stmt
elif (self.tokenList.token.attributeValue == 'cin'):
self.match('cin')
self.cinState()
self.stmt()
else:
print(Style.red('Syntax Error'))