def list_to_hashmap(trifle_list):
"""Convert (1 2 3 4) to {1 2, 3 4}, checking all the corner cases.
"""
if len(trifle_list.values) % 2 != 0:
# TODO: This should be a syntax error.
return TrifleExceptionInstance(
parse_failed,
u'Hashmaps must have an even number of elements, but got %d!' % len(trifle_list.values))
# TODO: Once we have immutable containers, we should allow these as keys too.
keys = []
values = []
for i in range(len(trifle_list.values) / 2):
keys.append(trifle_list.values[2 * i])
values.append(trifle_list.values[2 * i + 1])
is_hashable_error = check_hashable(keys)
if isinstance(is_hashable_error, TrifleExceptionInstance):
return is_hashable_error
hashmap = Hashmap()
for i in range(len(keys)):
hashmap.dict[keys[i]] = values[i]
return hashmap
def evaluate_value(value, environment):
if isinstance(value, Integer):
return value
elif isinstance(value, Float):
return value
elif isinstance(value, Fraction):
return value
elif isinstance(value, Boolean):
return value
elif isinstance(value, Null):
return value
elif isinstance(value, Keyword):
return value
# String and bytestring literals should evaluate to a copy of
# themselves, so we can safely use string literals in function
# bodies and then mutate them.
elif isinstance(value, String):
char_list = value.string
return String([char for char in char_list])
elif isinstance(value, Bytestring):
byte_list = value.byte_value
return Bytestring([byte for byte in byte_list])
# Likewise for hashmap literals.
# TODO: Should this be a deep copy?
elif isinstance(value, Hashmap):
hashmap = Hashmap()
hashmap.dict = value.dict.copy()
return hashmap
elif isinstance(value, Character):
return value
elif isinstance(value, Lambda):
return value
elif isinstance(value, Function):
return value
elif isinstance(value, Macro):
return value
elif isinstance(value, TrifleExceptionInstance):
return value
elif isinstance(value, TrifleExceptionType):
return value
elif isinstance(value, Macro):
return value
elif isinstance(value, Symbol):
symbol_name = value.symbol_name
if environment.contains(symbol_name):
return environment.get(symbol_name)
else:
# TODO: suggest variables with similar spelling.
return TrifleExceptionInstance(
no_such_variable,
u"No such variable defined: '%s'" % symbol_name)
else:
assert False, "I don't know how to evaluate that value: %s" % value
