diff options
| -rw-r--r-- | lexer.py | 109 |
1 files changed, 109 insertions, 0 deletions
@@ -25,6 +25,114 @@ t_string_lit = r'"[[:print]]*"' def inicio_lexer(data): tabla = TablaLex() + + es_string = False + es_caracter = False + es_comentario = False + selector = '' + recol_string = '' + recol_caracter = '' + recol_comentario = '' + recol_operador = '' + + for c in data + "\n": + print (c + ' (' + selector + ')') + + if selector == '': + # Entradas a tokens + if c == '"': + selector = 'STRING_LIT' + continue + elif c == '\'': + selector = 'CHAR_LIT' + continue + elif c == '/': + recol_comentario = '/' + elif (c == '=' or c == '+' or c == '-' or c == '&' or c == '|') and len(recol_operador) == 0: + recol_operador = c + continue + elif c == '!' or c == '<' or c == '>': + recol_operador = c + continue + elif c == '{': + tabla.insertar(LexToken('{', None, None, 1)) + elif c == '}': + tabla.insertar(LexToken('}', None, None, 1)) + elif c == '(': + tabla.insertar(LexToken('(', None, None, 1)) + elif c == ')': + tabla.insertar(LexToken(')', None, None, 1)) + elif c == ',': + tabla.insertar(LexToken(',', None, None, 1)) + elif c == ';': + tabla.insertar(LexToken(';', None, None, 1)) + elif c == '*': + tabla.insertar(LexToken('*', None, None, 1)) + + # 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 == '>=' or rc == '<=' or rc == '==' or rc == '!=' or + rc == '&&' or rc == '||' or rc == '++' or rc == '--'): + # Operador compuesto + tabla.insertar(LexToken(rc, None, None, 1)) + recol_operador = '' + continue + else: + # Operador simple + tabla.insertar(LexToken(recol_operador, None, None, 1)) + recol_operador = '' + + # 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 + continue + + # 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 = '' + continue + else: + recol_caracter += c + + # Comentarios + if selector == 'COMMENT': + if c == '*': + recol_comentario = c + continue + elif recol_comentario == '*': + if c == '/': + selector = '' + recol_comentario = '' + continue + else: + recol_comentario = '' + continue + + print (str(tabla)) + + ''' + tabla = TablaLex() # booleano ivan = verdadero tabla.insertar(LexToken('BOOLEAN', None, None, 1)) tabla.insertar(LexToken('IDENT', 'ivan', None, 1)) @@ -39,3 +147,4 @@ def inicio_lexer(data): tabla.actualizar('ivan', ident) ident = tabla.buscar('ivan') print (str(ident)) + ''' |