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forth.py
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132 lines (118 loc) · 3.58 KB
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operators = ['*','+','-','/','OVER','DROP','DUP','SWAP']
class StackUnderflowError(Exception):
pass
def evaluate(input_data):
user_def_operators = {}
defintions = [lines.upper() for lines in input_data[:-1]]
statement = input_data[-1].upper()
if statement.startswith(':'):
raise ValueError('ValueError')
#defintions = [[lines.split(' ')] for lines in defintions]
#defintions = [lists[1:-1] for lists in defintions]
if defintions:
temp = defintions[0].split(' ')
user_def_operators[temp[1]] = (' ').join(temp[2:-1])
for defintion in defintions[1:]:
temp = defintion.split(' ')
rhs = temp[2:-1]
for i in range(len(rhs)):
if rhs[i] in user_def_operators.keys():
rhs[i] = user_def_operators[rhs[i]]
temp = temp[:2] + rhs
user_def_operators[temp[1]] = (' ').join(temp[2:])
for key, value in user_def_operators.items():
statement = statement.replace(key, value)
statement = statement.split(' ')
for items in statement:
try:
int(items)
except ValueError:
if items not in operators:
raise ValueError('ValueError')
data = []
operator = []
while True:
for i in range(len(statement)):
try:
if statement[i] == 'DUP':
if len(statement) > 1:
statement[i] = statement[i-1]
else:
raise StackUnderflowError('StackUnderflowError')
elif statement[i] == 'OVER':
if len(statement) > 2:
statement[i] = statement[i-2]
else:
raise StackUnderflowError('StackUnderflowError')
elif statement[i] == 'DROP':
if len(statement) > 1:
pass
else:
raise StackUnderflowError('StackUnderflowError')
if i == len(statement)-1:
statement = statement[:i-1]
else:
statement = statement[:i-1]+statement[i+1:]
break
elif statement[i] == 'SWAP':
if len(statement) > 2:
pass
else:
raise StackUnderflowError('StackUnderflowError')
if i == len(statement)-1:
statement = statement[:i-2] + [statement[i-1],statement[i-2]]
else:
statement = statement[:i-2] + [statement[i-1],statement[i-2]] + statement[i+1:]
break
elif statement[i] == '+':
if len(statement) >= 3:
pass
else:
raise StackUnderflowError('StackUnderflowError')
if i == len(statement)-1:
statement = [int(statement[i-2])+int(statement[i-1])]
else:
statement = [int(statement[i-2])+int(statement[i-1])] + statement[i+1:]
break
elif statement[i] == '-':
if len(statement) >= 3:
pass
else:
raise StackUnderflowError('StackUnderflowError')
if i == len(statement)-1:
statement = [int(statement[i-2])-int(statement[i-1])]
else:
statement = [int(statement[i-2])-int(statement[i-1])] + statement[i+1:]
break
elif statement[i] == '/':
if len(statement) >= 3:
pass
else:
raise StackUnderflowError('StackUnderflowError')
if i == len(statement)-1:
statement = [int(statement[i-2])/int(statement[i-1])]
else:
statement = [int(statement[i-2])/int(statement[i-1])] + statement[i+1:]
break
elif statement[i] == '*':
if len(statement) >= 3:
pass
else:
raise StackUnderflowError('StackUnderflowError')
if i == len(statement)-1:
statement = [int(statement[i-2])*int(statement[i-1])]
else:
statement = [int(statement[i-2])*int(statement[i-1])] + statement[i+1:]
break
except IndexError:
raise StackUnderflowError('StackUnderflowError')
for i in range(len(statement)):
try:
int(statement[i])
except ValueError :
break
else:
statement[i]=int(statement[i])
else:
break
return statement