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interpreter.py
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interpreter.py
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import sys
from stack import Stack
from if_statement import IfBlock
# ==== Acessando o arquivo e coletando o conteúdo. ====
path = sys.argv[1]
if not path.endswith(".limpil"):
print("Você não selecionou um arquivo .limpil.")
sys.exit(0)
lines = list()
with open(path, "r") as file:
lines = [line.strip() for line in file.readlines()]
# ==== Separando os comandos para interpretação. ====
program = list()
token_counter = 0
label_tracker = {}
if_blocks = list()
if_block_open = None
line_counter = 0
for line in lines:
line_counter += 1
splitted_command = line.split(" ")
opcode = splitted_command[0]
if opcode == "":
continue
if opcode.startswith("--"): # Comentários
continue
if opcode.endswith(":"):
label_tracker[opcode[:-1]] = token_counter
continue
program.append(opcode)
token_counter += 1
if opcode == "ADICIONE.INTEIRO":
number = int(splitted_command[1])
program.append(number)
token_counter += 1
elif opcode == "SE":
if if_block_open is not None:
raise SyntaxError("Erro de sintaxe. Bloco SE iniciado, mas não fechado com SE.FIM")
if splitted_command[1][-1] != ":":
raise SyntaxError("Comando SE com a sintaxe incorreta. Se esqueceu do ':'?")
dataCheck = splitted_command[1][:-1]
if dataCheck[0] == '"':
block = IfBlock(value = dataCheck[1:-1], startLine=line_counter)
elif dataCheck.__contains__("."):
block = IfBlock(value = float(dataCheck), startLine=line_counter)
else:
block = IfBlock(value = int(dataCheck), startLine=line_counter)
if_block_open = block
elif opcode == "SE.FIM":
if if_block_open is None:
raise SyntaxError("Erro, bloco SE não foi inicializado!")
if_block_open.endLine = line_counter
if_blocks.append(if_block_open)
if_block_open = None
elif opcode == "ADICIONE.DECIMAL":
number = float(splitted_command[1])
program.append(number)
token_counter += 1
elif opcode == "IMPRIMA":
string = " ".join((splitted_command[1:]))[1:-1]
program.append(string)
token_counter += 1
elif opcode == "PULE.SE.IGUAL.ZERO":
label = splitted_command[1]
program.append(label)
token_counter += 1
elif opcode == "PULE.SE.MAIORQUE.ZERO":
label = splitted_command[1]
program.append(label)
token_counter += 1
# ==== Interpretando os comandos ====
stack = Stack(256)
pc = 0 # program_counter
if_counter = 0
if_content_skip = False
while program[pc] != "PARE":
opcode = program[pc]
pc += 1
if opcode == "SE.FIM":
if_content_skip = False
if if_content_skip is True:
continue
if opcode == "ADICIONE.INTEIRO":
number = program[pc]
pc += 1
stack.push(number)
elif opcode == "ADICIONE.DECIMAL":
number = program[pc]
pc += 1
stack.push(number)
elif opcode == "RETIRE":
stack.pop()
elif opcode == "RETIRE.E.IMPRIMA":
number = stack.pop()
print(number)
elif opcode == "SOMA":
a = stack.pop()
b = stack.pop()
stack.push(a+b)
elif opcode == "DIFERENCA":
a = stack.pop()
b = stack.pop()
stack.push(b-a)
elif opcode == "MUL":
a = stack.pop()
b = stack.pop()
stack.push(a*b)
elif opcode == "DIV":
a = stack.pop()
b = stack.pop()
stack.push(b/a)
elif opcode == "POTENCIA.QUADRADO":
a = stack.pop()
stack.push(a * a)
elif opcode == "IMPRIMA":
string_literal = program[pc]
pc += 1
print(string_literal)
elif opcode == "TOPO":
stack.top()
elif opcode == "LER.STRING":
string = str(input())
stack.push(string)
elif opcode == "LER.INTEIRO":
number = int(input())
stack.push(number)
elif opcode == "LER.DECIMAL":
number = float(input())
stack.push(number)
elif opcode == "PULE.SE.IGUAL.ZERO":
number = stack.top()
if number == 0:
pc = label_tracker[program[pc]]
else:
pc += 1
elif opcode == "PULE.SE.MAIORQUE.ZERO":
number = stack.top()
if number > 0:
pc = label_tracker[program[pc]]
else:
pc += 1
elif opcode == "SE":
if if_counter > len(if_blocks):
raise SystemError("if_counter maior que if_blocks. Erro do programa.")
block = if_blocks[if_counter]
if block.value == stack.top(): # Se a condição for correta, continue
if_counter += 1
else: # Caso contrário, pule para o fim do bloco.
if_counter += 1
if_content_skip = True