def readCharByChar(inputfile,outputfile):
global RC_counter
#--------posicionar el contador
inputfile.seek(syntacticMachine.char_counter)
# lectura del fichero en un solo caracter. La lectura no avanza el cursor. (char_counter)
# para registrar la lectura se llamará a syntacticMachine.leer()
c =inputfile.read(1)
if c is '': #EOF
tokenG = genToken(outputfile,"EOF","")
syntacticMachine.stop_reading_file() #¡¡esto solo es para EOF!!
return tokenG
elif c is '\n':
tokenG = genToken(outputfile,"CR","") #DELIMITADOR
syntacticMachine.leer()
RC_counter +=0.5 #para corregir el doble RC
if c is '\n':
syntacticMachine.leer()
RC_counter +=0.5
return tokenG
elif c is '{':
tokenG = genToken(outputfile,"K1","") #LLAVE APERTURA
syntacticMachine.leer()
return tokenG
elif c is '}':
tokenG = genToken(outputfile,"K2","") #LLAVE CIERRE
syntacticMachine.leer()
return tokenG
elif c is '!':
tokenG = genToken(outputfile,"NOP","") #OPERADOR NEGACIÓN
syntacticMachine.leer()
return tokenG
elif c is '+': #OPERADOR SUMA
tokenG = genToken(outputfile,"ADD","")
syntacticMachine.leer()
return tokenG
elif c is '=':
syntacticMachine.leer()
c = inputfile.read(1)
if c is '=':
tokenG = genToken(outputfile,"EOP", "") #COMPARACION
syntacticMachine.leer()
return tokenG
else:
tokenG = genToken(outputfile,"ASIG", "") #ASIGNACION
return tokenG
elif c is '-':
syntacticMachine.leer()
c = inputfile.read(1)
if c is '-':
error("LEXIC",RC_counter,"PRE-DECREMENT IS NOT RECOGNISED BY THIS PROGRAM VERSION")
else:
tokenG = genToken(outputfile,"PRE", "") #PREDECREMENTO
return tokenG
elif c is '"': #STRING (O CADENA)
pal = ''
fin = False
while True:
pal = pal + c
c = inputfile.read(1)
syntacticMachine.leer()
if c is '\n':
error("LEXIC",RC_counter,"STR: Expected closing '\"'")
fin = True
break
if c is '"':
break
if not fin:
pal = pal + c
tokenG = genToken(outputfile,"STR", pal)
syntacticMachine.leer()
return tokenG
elif c is '/': #COMENTARIO
syntacticMachine.leer()
c = inputfile.read(1)
if c is '/':
pal = '/'
while c is not '\n':
pal = pal + c
c = inputfile.read(1)
syntacticMachine.leer()
return tokenG
else:
error("LEXIC",RC_counter,"COM: Expected '//'")
elif c.isdigit(): #ENTERO
d = 0
fail_digit = False
while c.isdigit() or c is ',' or c is '.':
if c is '.' or c is ',':
d = d*10 + 0
fail_digit = True
else:
d = d*10 + int(c)
c = inputfile.read(1)
syntacticMachine.leer()
if fail_digit:
error("LEXIC",RC_counter,"INT: Expected Integer")
else:
tokenG = genToken(outputfile,"INT", d)
return tokenG
elif c.isalpha(): #PALABRA RESERVADA
pal = '' #IDENTIFICADOR
while c.isalnum() or c is '_':
pal = pal + c
c = inputfile.read(1)
syntacticMachine.leer()
if pal in palabras_reservadas:
tokenG = genToken(outputfile,"RW", pal)
return tokenG
else:
tokenG = genToken(outputfile,"ID", pal)
return tokenG
else:
#Aqui vienen los espacios en blanco
syntacticMachine.leer()
def readCharByChar(self):
global RC_counter
self.inputfile.seek(syntacticMachine.char_counter)
c = self.inputfile.read(1) #un solo carácter
if c is '': #EOF
token2 = self.genToken("EOF","")
syntacticMachine.stop_reading_file() #¡¡esto solo es para EOF!!
return token2
elif c is '\n':
token2 = self.genToken("RC","") #DELIMITADOR
syntacticMachine.next()
RC_counter +=0.5
return token2
elif c is '{':
token2 = self.genToken("LLA","") #LLAVE APERTURA
syntacticMachine.next()
return token2
elif c is '}':
token2 = self.genToken("LLC","") #LLAVE CIERRE
syntacticMachine.next()
return token2
elif c is '!':
token2 = self.genToken("NEG","") #OPERADOR NEGACIÓN
syntacticMachine.next()
return token2
elif c is '+': #OPERADOR SUMA
token2 = self.genToken("SUMA","")
syntacticMachine.next()
return token2
elif c is '=':
syntacticMachine.next()
c = self.inputfile.read(1)
if c is '=':
token2 = self.genToken("COMP", "") #COMPARACION
syntacticMachine.next()
return token2
else:
token2 = self.genToken("ASIG", "") #ASIGNACION
return token2
elif c is '-':
syntacticMachine.next()
c = self.inputfile.read(1)
if c is '-':
token2 = self.genToken("PRE", "") #PREDECREMENTO
syntacticMachine.next()
return token2
else:
error("LEXIC",RC_counter,"PRE: Expected '-'")
elif c is '"': #STRING (O CADENA)
pal = ''
fin = False
while True:
pal = pal + c
c = self.inputfile.read(1)
syntacticMachine.next()
if c is '\n':
error("LEXIC",RC_counter,"STR: Expected closing '\"'")
fin = True
break
if c is '"':
break
if not fin:
pal = pal + c
token2 = self.genToken("STR", pal)
syntacticMachine.next()
return token2
elif c is '/': #COMENTARIO
syntacticMachine.next()
c = self.inputfile.read(1)
if c is '/':
pal = '/'
while c is not '\n':
pal = pal + c
c = self.inputfile.read(1)
syntacticMachine.next()
token2 = self.genToken("COM", pal)
return token2
else:
error("LEXIC",RC_counter,"COM: Expected '//'")
elif c.isdigit(): #ENTERO
d = 0
fail_digit = False
while c.isdigit() or c is ',' or c is '.':
if c is '.' or c is ',':
d = d*10 + 0
fail_digit = True
else:
d = d*10 + int(c)
c = self.inputfile.read(1)
syntacticMachine.next()
if fail_digit:
error("LEXIC",RC_counter,"INT: Expected Integer")
else:
token2 = self.genToken("INT", d)
return token2
elif c.isalpha(): #PALABRA RESERVADA
pal = '' #IDENTIFICADOR
while c.isalnum() or c is '_':
pal = pal + c
c = self.inputfile.read(1)
syntacticMachine.next()
if pal in palabras_reservadas:
token2 = self.genToken("PR", pal)
return token2
else:
token2 = self.genToken("ID", pal)
return token2
else:
#Aqui vienen los espacios en blanco
syntacticMachine.next()
