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from enum import Enum
from symbol import LexToken, TablaLex, tokens
op_compuestos = ['>=', '<=', '==', '!=', '&&', '||', '++', '--']
op_simples_a = ['=', '+', '-', '&', '|']
op_simples_b = ['!', '<', '>']
op_simples = op_simples_a + op_simples_b
def inicio_lexer(data):
tabla = TablaLex()
selector = ''
recol_string = ''
recol_caracter = ''
recol_comentario = ''
recol_operador = ''
recol_ident = ''
for c in data + "\n":
if c != "\t" and c != "\n":
print (c + ' (' + selector + ')')
if selector == '':
# Entradas a tokens
if c == '"':
selector = 'STRING_LIT'
continue
elif c == '\'':
selector = 'CHAR_LIT'
continue
elif c.isalpha() or c == '_':
selector = 'ID/RESERVADA'
elif c == '/':
recol_comentario = '/'
elif c in op_simples_a and recol_operador == '':
recol_operador = c
continue
elif c in op_simples_b:
recol_operador = c
continue
elif (c == '{' or c == '}' or c == '(' or c == ')' or
c == ',' or c == '.' or c == ';' or (c == '*' and recol_comentario == '')):
tabla.insertar(LexToken(c, None, None, 1))
continue
# Apertura de comentario
if recol_comentario == '/' and c == '*':
selector = 'COMMENT'
recol_comentario = ''
continue
# Apertura de operador compuesto
if len(recol_operador) > 0:
rc = recol_operador + c
if rc in op_compuestos:
# Operador compuesto
tabla.insertar(LexToken(rc, None, None, 1))
recol_operador = ''
continue
else:
# Operador simple
tabla.insertar(LexToken(recol_operador, None, None, 1))
if c in op_simples:
tabla.insertar(LexToken(c, None, None, 1))
recol_operador = ''
continue
# Cadenas de texto
if selector == 'STRING_LIT':
if c == '"':
tabla.insertar(LexToken('STRING_LIT', None, recol_string, 1))
selector = ''
recol_string = ''
else:
recol_string += c
# Caracteres
if selector == 'CHAR_LIT':
if len(recol_caracter) > 1:
print ('Error: más de un caracter en una literal de caracter')
break
if c == '\'':
if len(recol_caracter) == 0:
print ('Error: literal de caracter vacía')
break
tabla.insertar(LexToken('CHAR_LIT', None, recol_caracter, 1))
selector = ''
recol_caracter = ''
else:
recol_caracter += c
# Comentarios
if selector == 'COMMENT':
if c == '*':
recol_comentario = c
elif recol_comentario == '*':
if c == '/':
selector = ''
recol_comentario = ''
else:
recol_comentario = ''
# Identificador o palabra reservada
if selector == 'ID/RESERVADA':
if c.isalnum() or c == '_':
recol_ident += c
else:
if recol_ident == 'booleano':
tabla.insertar(LexToken('BOOLEAN', None, None, 1))
elif recol_ident == 'detener':
tabla.insertar(LexToken('BREAK', None, None, 1))
elif recol_ident == 'byte':
tabla.insertar(LexToken('BYTE', None, None, 1))
elif recol_ident == 'caracter':
tabla.insertar(LexToken('CHAR', None, None, 1))
elif recol_ident == 'doble':
tabla.insertar(LexToken('DOUBLE', None, None, 1))
elif recol_ident == 'sino':
tabla.insertar(LexToken('ELSE', None, None, 1))
elif recol_ident == 'porcada':
tabla.insertar(LexToken('FOR', None, None, 1))
elif recol_ident == 'si':
tabla.insertar(LexToken('IF', None, None, 1))
elif recol_ident == 'entero':
tabla.insertar(LexToken('INT', None, None, 1))
elif recol_ident == 'imprimir':
tabla.insertar(LexToken('PRINT', None, None, 1))
elif recol_ident == 'leer':
tabla.insertar(LexToken('READ', None, None, 1))
elif recol_ident == 'retorna':
tabla.insertar(LexToken('RETURN', None, None, 1))
elif recol_ident == 'vacio':
tabla.insertar(LexToken('VOID', None, None, 1))
elif recol_ident == 'mientras':
tabla.insertar(LexToken('WHILE', None, None, 1))
elif recol_ident == 'verdadero':
tabla.insertar(LexToken('BOOLEAN_LIT', None, True, 1))
elif recol_ident == 'falso':
tabla.insertar(LexToken('BOOLEAN_LIT', None, False, 1))
else:
tabla.insertar(LexToken('IDENT', recol_ident, None, 1))
recol_ident = ''
selector = ''
# Imprimir tabla de símbolos
print (str(tabla))
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