Exemplo n.º 1
0
def assign(name: Value, value: Value) -> Value:
    """
	Assigns `value` to `name`, where `name` must be an `Identifier`.

	Returns `value`.
	"""

    value = value.run()
    name.assign(value)
    return value
Exemplo n.º 2
0
def assign(name: Value, value: Value) -> Value:
	"""
	Assigns `value` to `name`, converting `name` to an `Identifier` if
	it isn't already.

	Returns `value`.
	"""
	if not isinstance(name, Identifier):
		name = Identifier(str(name))

	value = value.run()
	name.assign(value)
	return value
Exemplo n.º 3
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def dump(arg: Value) -> Value:
	""" Dumps a debug representation of `arg` and returns `arg`. """
	arg = arg.run()

	print(repr(arg), end='')

	return arg
Exemplo n.º 4
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	def parse(stream: Stream) -> Union[None, Function]:
		"""
		Parses a `Function` from the stream, returning `None` if the
		stream didn't start with a function character.

		This will both parse the function name, and its arguments. If not
		all the arguments could be parsed, a `ParseError` is raised.
		"""
		name = stream.peek()
		if name not in _FUNCS:
			return None

		func = _FUNCS[name]
		stream.matches(Function.REGEX)

		args = []
		for arg in range(func.__code__.co_argcount):
			value = Value.parse(stream)

			if value is None:
				raise ParseError(f'Missing argument {arg} for function {name}')

			args.append(value)

		return Function(func, name, args)
Exemplo n.º 5
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def eval_(text: Value) -> Value:
	""" Evaluates `text` as Knight code, returning its result. """
	value = Value.parse(Stream(str(text)))

	if value is None:
		raise ParseError('Nothing to parse.')
	else:
		return value.run()
Exemplo n.º 6
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def pow(lhs: Value, rhs: Value) -> Value:
	""" Exponentiates `lhs` by `rhs`. """
	return lhs.run() ** rhs.run()
Exemplo n.º 7
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def while_(cond: Value, body: Value) -> Null:
	""" Executes `body` while `cond` is truthy. """
	while cond:
		body.run()

	return Null()
Exemplo n.º 8
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def then(lhs: Value, rhs: Value) -> Value:
	""" Simply executes `lhs`, then `rhs`, then returns `rhs`. """
	lhs.run()
	return rhs.run()
Exemplo n.º 9
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def or_(lhs: Value, rhs: Value) -> Value:
	""" Returns `lhs` if its truthy, otherwise `rhs`. """
	return lhs.run() or rhs.run()
Exemplo n.º 10
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def and_(lhs: Value, rhs: Value) -> Value:
	""" Returns `lhs` if its falsey, otherwise `rhs`. """
	return lhs.run() and rhs.run()
Exemplo n.º 11
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def eql(lhs: Value, rhs: Value) -> Boolean:
	""" Checks to see if `lhs` is equal to `rhs`. """
	return Boolean(lhs.run() == rhs.run())
Exemplo n.º 12
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def gth(lhs: Value, rhs: Value) -> Boolean:
	""" Checks to see if `lhs` is greater than `rhs`. """
	return Boolean(lhs.run() > rhs.run())
Exemplo n.º 13
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def mod(lhs: Value, rhs: Value) -> Value:
	""" Modulos `lhs` by `rhs`. """
	return lhs.run() % rhs.run()
Exemplo n.º 14
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def div(lhs: Value, rhs: Value) -> Value:
	""" Divides `lhs` by `rhs`. """
	return lhs.run() // rhs.run()
Exemplo n.º 15
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def mul(lhs: Value, rhs: Value) -> Value:
	""" Multiplies `lhs` by `rhs`. """
	return lhs.run() * rhs.run()
Exemplo n.º 16
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def sub(lhs: Value, rhs: Value) -> Value:
	""" Subtracts `rhs` from `lhs`. """
	return lhs.run() - rhs.run()
Exemplo n.º 17
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def add(lhs: Value, rhs: Value) -> Value:
	""" Adds `rhs` to `lhs`. """
	return lhs.run() + rhs.run()
Exemplo n.º 18
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def call(blk: Value) -> Value:
	""" Executes the return value of a `block`. """
	return blk.run().run()
Exemplo n.º 19
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def lth(lhs: Value, rhs: Value) -> Boolean:
	""" Checks to see if `lhs` is less than `rhs`. """
	return Boolean(lhs.run() < rhs.run())