def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder):
verify_min_callable_length(self, 2, len(operands))
bindings = operands[0]
if not isinstance(bindings, Pair) and bindings is not Nil:
raise OperandDeduceError(f"Expected first argument of let to be a Pair, not {bindings}.")
new_frame = Frame("anonymous let", frame)
bindings_holder = gui_holder.expression.children[1]
bindings = pair_to_list(bindings)
for i, binding in enumerate(bindings):
if not isinstance(binding, Pair):
raise OperandDeduceError(f"Expected binding to be a Pair, not {binding}.")
binding_holder = bindings_holder.expression.children[i]
binding = pair_to_list(binding)
if len(binding) != 2:
raise OperandDeduceError(f"Expected binding to be of length 2, not {len(binding)}.")
name, expr = binding
if not isinstance(name, Symbol):
raise OperandDeduceError(f"Expected first element of binding to be a Symbol, not {name}.")
new_frame.assign(name, evaluate(expr, frame, binding_holder.expression.children[1]))
value = None
for i, (operand, holder) in enumerate(zip(operands[1:], gui_holder.expression.children[2:])):
value = evaluate(operand, new_frame, holder, i == len(operands) - 2)
new_frame.assign(return_symbol, value)
return value
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
verify_min_callable_length(self, 1, len(operands))
for (cond_i, cond) in enumerate(operands):
if (not isinstance(cond, Pair)):
raise OperandDeduceError(''.join([
'Unable to evaluate clause of cond, as ',
'{}'.format(cond), ' is not a Pair.'
]))
expanded = pair_to_list(cond)
cond_holder = gui_holder.expression.children[(cond_i + 1)]
cond_holder.link_visual(VisualExpression(cond))
eval_condition = SingletonTrue
if ((not isinstance(expanded[0], Symbol))
or (expanded[0].value != 'else')):
eval_condition = evaluate(expanded[0], frame,
cond_holder.expression.children[0])
if ((isinstance(expanded[0], Symbol) and
(expanded[0].value == 'else'))
or (eval_condition is not SingletonFalse)):
out = eval_condition
for (i, expr) in enumerate(expanded[1:]):
out = evaluate(expr, frame,
cond_holder.expression.children[(i + 1)],
(i == (len(expanded) - 2)))
return out
return Undefined
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder, eval_operands=True):
verify_exact_callable_length(self, 1, len(operands))
if eval_operands:
operand = evaluate(operands[0], frame, gui_holder.expression.children[1])
else:
operand = operands[0]
gui_holder.expression.set_entries([VisualExpression(operand, gui_holder.expression.display_value)])
gui_holder.apply()
return evaluate(operand, frame, gui_holder.expression.children[0], True)
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder):
verify_min_callable_length(self, 2, len(operands))
if len(operands) > 3:
verify_exact_callable_length(self, 3, len(operands))
if evaluate(operands[0], frame, gui_holder.expression.children[1]) is SingletonFalse:
if len(operands) == 2:
return Undefined
else:
return evaluate(operands[2], frame, gui_holder.expression.children[3], True)
else:
return evaluate(operands[1], frame, gui_holder.expression.children[2], True)
def execute(self,
operands: List[Expression],
frame: Frame,
gui_holder: Holder,
eval_operands=True):
new_frame = Frame(self.name,
self.frame if self.lexically_scoped else frame)
if eval_operands and self.evaluates_operands:
operands = evaluate_all(operands, frame,
gui_holder.expression.children[1:])
if self.var_param:
verify_min_callable_length(self, len(self.params), len(operands))
else:
verify_exact_callable_length(self, len(self.params), len(operands))
if len(self.body) > 1:
body = [Pair(Symbol("begin"), make_list(self.body))]
else:
body = self.body
for param, value in zip(self.params, operands):
new_frame.assign(param, value)
if self.var_param:
new_frame.assign(self.var_param,
make_list(operands[len(self.params):]))
out = None
gui_holder.expression.set_entries([
VisualExpression(expr, gui_holder.expression.display_value)
for expr in body
])
gui_holder.apply()
for i, expression in enumerate(body):
out = evaluate(expression,
new_frame,
gui_holder.expression.children[i],
self.evaluates_operands and i == len(body) - 1,
log_stack=len(self.body) == 1)
new_frame.assign(return_symbol, out)
if not self.evaluates_operands:
gui_holder.expression.set_entries(
[VisualExpression(out, gui_holder.expression.display_value)])
out = evaluate(out, frame, gui_holder.expression.children[i], True)
return out
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder):
value = None
for i, expr in enumerate(operands):
value = evaluate(expr, frame, gui_holder.expression.children[i + 1], i == len(operands) - 1)
if value is SingletonFalse:
return SingletonFalse
return value if operands else SingletonTrue
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
verify_min_callable_length(self, 2, len(operands))
params = operands[0]
if isinstance(params, Symbol):
verify_exact_callable_length(self, 2, len(operands))
frame.assign(
params,
evaluate(operands[1], frame,
gui_holder.expression.children[2]))
return params
elif isinstance(params, Pair):
name = params.first
operands[0] = params.rest
if (not isinstance(name, Symbol)):
raise OperandDeduceError(''.join(
['Expected a Symbol, not ', '{}'.format(name), '.']))
frame.assign(
name,
Lambda().execute(operands, frame, gui_holder, name.value))
return name
else:
raise OperandDeduceError(''.join([
'Expected a Pair, not ', '{}'.format(params),
', as the first operand of define-macro.'
]))
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder):
verify_exact_callable_length(self, 2, len(operands))
name = operands[0]
if not isinstance(name, Symbol):
raise OperandDeduceError(f"Expected a Symbol, not {name}, as the first operand of set!")
frame.mutate(name, evaluate(operands[1], frame, gui_holder.expression.children[2]))
return Undefined
def execute(self,
operands: List[Expression],
frame: Frame,
gui_holder: Holder,
eval_operands=True):
verify_exact_callable_length(self, 1, len(operands))
if eval_operands:
operands = evaluate_all(operands, frame,
gui_holder.expression.children[1:])
if not isinstance(operands[0], Symbol):
raise OperandDeduceError(
f"Load expected a Symbol, received {operands[0]}.")
if logger.fragile:
raise IrreversibleOperationError()
try:
with open(f"{operands[0].value}.scm") as file:
code = "(begin-noexcept" + "\n".join(file.readlines()) + "\n)"
buffer = TokenBuffer([code])
expr = get_expression(buffer)
gui_holder.expression.set_entries([
VisualExpression(expr, gui_holder.expression.display_value)
])
gui_holder.apply()
return evaluate(expr, frame, gui_holder.expression.children[0],
True)
except OSError as e:
raise LoadError(e)
def execute(self,
operands: List[Expression],
frame: Frame,
gui_holder: Holder,
eval_operands=True):
verify_exact_callable_length(self, 1, len(operands))
operand = operands[0]
if eval_operands:
operand = evaluate_all(operands, frame,
gui_holder.expression.children[1:])[0]
if not isinstance(operand, Promise):
raise OperandDeduceError(
f"Force expected a Promise, received {operand}")
if operand.forced:
return operand.expr
if logger.fragile:
raise IrreversibleOperationError()
gui_holder.expression.set_entries([
VisualExpression(operand.expr, gui_holder.expression.display_value)
])
gui_holder.apply()
evaluated = evaluate(operand.expr, operand.frame,
gui_holder.expression.children[0])
if not logger.dotted and not isinstance(evaluated, (Pair, NilType)):
raise TypeMismatchError(
f"Unable to force a Promise evaluating to {operand.expr}, expected another Pair or Nil"
)
operand.expr = evaluated
operand.force()
return operand.expr
def execute(self,
operands: List[Expression],
frame: Frame,
gui_holder: Holder,
eval_operands=True):
verify_exact_callable_length(self, 1, len(operands))
if eval_operands:
operands = evaluate_all(operands, frame,
gui_holder.expression.children[1:])
if (not isinstance(operands[0], Symbol)):
raise OperandDeduceError(''.join([
'Load expected a Symbol, received ', '{}'.format(operands[0]),
'.'
]))
if logger.fragile:
raise IrreversibleOperationError()
try:
with open(''.join(['{}'.format(operands[0].value),
'.scm'])) as file:
code = (('(begin' + '\n'.join(file.readlines())) + '\n)')
buffer = TokenBuffer([code])
expr = get_expression(buffer)
gui_holder.expression.set_entries([
VisualExpression(expr, gui_holder.expression.display_value)
])
gui_holder.apply()
return evaluate(expr, frame, gui_holder.expression.children[0],
True)
except OSError as e:
raise LoadError(e)
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder):
verify_min_callable_length(self, 1, len(operands))
for cond_i, cond in enumerate(operands):
if not isinstance(cond, Pair):
raise OperandDeduceError(f"Unable to evaluate clause of cond, as {cond} is not a Pair.")
expanded = pair_to_list(cond)
cond_holder = gui_holder.expression.children[cond_i + 1]
eval_condition = SingletonTrue
if not isinstance(expanded[0], Symbol) or expanded[0].value != "else":
eval_condition = evaluate(expanded[0], frame, cond_holder.expression.children[0])
if (isinstance(expanded[0], Symbol) and expanded[0].value == "else") \
or eval_condition is not SingletonFalse:
out = eval_condition
for i, expr in enumerate(expanded[1:]):
out = evaluate(expr, frame, cond_holder.expression.children[i + 1], i == len(expanded) - 2)
return out
return Undefined
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
verify_min_callable_length(self, 1, len(operands))
out = None
for i, (operand, holder) in enumerate(
zip(operands, gui_holder.expression.children[1:])):
out = evaluate(operand, frame, holder, i == len(operands) - 1)
return out
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder):
out = Undefined
for i, (operand, holder) in enumerate(zip(operands, gui_holder.expression.children[1:])):
try:
out = evaluate(operand, frame, holder, i == len(operands) - 1)
except (SchemeError, RecursionError, ValueError, ZeroDivisionError) as e:
logger.raw_out("LoadError: " + str(e) + "\n")
return out
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
for (i, expr) in enumerate(operands):
value = evaluate(expr, frame,
gui_holder.expression.children[(i + 1)],
(i == (len(operands) - 1)))
if (value is not SingletonFalse):
return value
return SingletonFalse
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
verify_min_callable_length(self, 2, len(operands))
bindings = operands[0]
if ((not isinstance(bindings, Pair)) and (bindings is not Nil)):
raise OperandDeduceError(''.join([
'Expected first argument of let to be a Pair, not ',
'{}'.format(bindings), '.'
]))
new_frame = Frame('anonymous let', frame)
gui_holder.expression.children[1].link_visual(
VisualExpression(bindings))
bindings_holder = gui_holder.expression.children[1]
bindings = pair_to_list(bindings)
for (i, binding) in enumerate(bindings):
if (not isinstance(binding, Pair)):
raise OperandDeduceError(''.join([
'Expected binding to be a Pair, not ',
'{}'.format(binding), '.'
]))
binding_holder = bindings_holder.expression.children[i]
binding_holder.link_visual(VisualExpression(binding))
binding = pair_to_list(binding)
if (len(binding) != 2):
raise OperandDeduceError(''.join([
'Expected binding to be of length 2, not ',
'{}'.format(len(binding)), '.'
]))
(name, expr) = binding
if (not isinstance(name, Symbol)):
raise OperandDeduceError(''.join([
'Expected first element of binding to be a Symbol, not ',
'{}'.format(name), '.'
]))
new_frame.assign(
name,
evaluate(expr, frame, binding_holder.expression.children[1]))
value = None
for (i, (operand, holder)) in enumerate(
zip(operands[1:], gui_holder.expression.children[2:])):
value = evaluate(operand, new_frame, holder,
(i == (len(operands) - 2)))
new_frame.assign(return_symbol, value)
return value
def quasiquote_evaluate(cls, expr: Expression, frame: Frame, gui_holder: Holder, splicing=False):
is_well_formed = False
if isinstance(expr, Pair):
try:
lst = pair_to_list(expr)
except OperandDeduceError:
pass
else:
is_well_formed = not any(map(
lambda x: isinstance(x, Symbol) and x.value in ["unquote", "quasiquote", "unquote-splicing"], lst))
visual_expression = gui_holder.expression
if not is_well_formed:
visual_expression.children[2:] = []
if isinstance(expr, Pair):
if isinstance(expr.first, Symbol) and expr.first.value in ("unquote", "unquote-splicing"):
if expr.first.value == "unquote-splicing" and not splicing:
raise OperandDeduceError("Unquote-splicing must be in list template.")
gui_holder.evaluate()
verify_exact_callable_length(expr.first, 1, len(pair_to_list(expr)) - 1)
out = evaluate(expr.rest.first, frame, visual_expression.children[1])
visual_expression.value = out
gui_holder.complete()
return out
elif isinstance(expr.first, Symbol) and expr.first.value == "quasiquote":
visual_expression.value = expr
gui_holder.complete()
return expr
else:
if is_well_formed:
out = []
for sub_expr, holder in zip(pair_to_list(expr), visual_expression.children):
splicing = isinstance(sub_expr, Pair) and isinstance(sub_expr.first, Symbol) \
and sub_expr.first.value == "unquote-splicing"
evaluated = Quasiquote.quasiquote_evaluate(sub_expr, frame, holder, splicing)
if splicing:
if not isinstance(evaluated, (Pair, NilType)):
raise TypeMismatchError(f"Can only splice lists, not {evaluated}.")
out.extend(pair_to_list(evaluated))
else:
out.append(evaluated)
out = make_list(out)
else:
if not logger.dotted:
raise OperandDeduceError(f"{expr} is an ill-formed quasiquotation.")
out = Pair(Quasiquote.quasiquote_evaluate(expr.first, frame, visual_expression.children[0]),
Quasiquote.quasiquote_evaluate(expr.rest, frame, visual_expression.children[1]))
visual_expression.value = out
gui_holder.complete()
return out
else:
visual_expression.value = expr
gui_holder.complete()
return expr
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
verify_exact_callable_length(self, 2, len(operands))
case = operands[0]
operands[0] = evaluate(operands[0], frame,
gui_holder.expression.children[1])
if not IsEqual().execute_evaluated(operands, frame).value:
log.logger.raw_out(
f"Evaluated {case}, expected {operands[1]}, got {operands[0]}.\n"
)
else:
log.logger.raw_out(
f"Evaluated {case}, got {operands[0]}, as expected.\n")
return Undefined
def execute(self, operands: List[Expression], frame: Frame, gui_holder: Holder, eval_operands=True):
verify_exact_callable_length(self, 1, len(operands))
if eval_operands:
operands = evaluate_all(operands, frame, gui_holder.expression.children[1:])
if not isinstance(operands[0], String):
raise OperandDeduceError(f"Load expected a String, received {operands[0]}.")
if logger.fragile:
raise IrreversibleOperationError()
from os import listdir
from os.path import join
directory = operands[0].value
try:
targets = sorted(listdir(directory))
targets = [join(directory, target) for target in targets if target.endswith(".scm")]
exprs = [make_list([Symbol("load"), make_list([Symbol("quote"), Symbol(x[:-4])])]) for x in targets]
equiv = make_list([Symbol("begin-noexcept")] + exprs)
gui_holder.expression.set_entries([equiv])
gui_holder.apply()
return evaluate(equiv, frame, gui_holder.expression.children[0], True)
except Exception as e:
raise SchemeError(e)
def execute(self, operands: List[Expression], frame: Frame,
gui_holder: Holder):
verify_exact_callable_length(self, 2, len(operands))
operands[0] = evaluate(operands[0], frame,
gui_holder.expression.children[1])
return Pair(operands[0], Promise(operands[1], frame))
def quasiquote_evaluate(cls,
expr: Expression,
frame: Frame,
gui_holder: Holder,
splicing=False):
is_well_formed = False
if isinstance(expr, Pair):
try:
lst = pair_to_list(expr)
except OperandDeduceError:
pass
else:
is_well_formed = (not any(
map((lambda x:
(isinstance(x, Symbol) and
(x.value in
['unquote', 'quasiquote', 'unquote-splicing']))),
lst)))
visual_expression = VisualExpression(expr)
gui_holder.link_visual(visual_expression)
if (not is_well_formed):
visual_expression.children[2:] = []
if isinstance(expr, Pair):
if (isinstance(expr.first, Symbol)
and (expr.first.value in ('unquote', 'unquote-splicing'))):
if ((expr.first.value == 'unquote-splicing')
and (not splicing)):
raise OperandDeduceError(
'Unquote-splicing must be in list template.')
gui_holder.evaluate()
verify_exact_callable_length(expr.first, 1,
(len(pair_to_list(expr)) - 1))
out = evaluate(expr.rest.first, frame,
visual_expression.children[1])
visual_expression.value = out
gui_holder.complete()
return out
elif (isinstance(expr.first, Symbol)
and (expr.first.value == 'quasiquote')):
visual_expression.value = expr
gui_holder.complete()
return expr
else:
if is_well_formed:
out = []
for (sub_expr, holder) in zip(pair_to_list(expr),
visual_expression.children):
splicing = (isinstance(sub_expr, Pair)
and isinstance(sub_expr.first, Symbol)
and (sub_expr.first.value
== 'unquote-splicing'))
evaluated = Quasiquote.quasiquote_evaluate(
sub_expr, frame, holder, splicing)
if splicing:
if (not isinstance(evaluated, (Pair, NilType))):
raise TypeMismatchError(''.join([
'Can only splice lists, not ',
'{}'.format(evaluated), '.'
]))
out.extend(pair_to_list(evaluated))
else:
out.append(evaluated)
out = make_list(out)
else:
if (not logger.dotted):
raise OperandDeduceError(''.join([
'{}'.format(expr),
' is an ill-formed quasiquotation.'
]))
out = Pair(
Quasiquote.quasiquote_evaluate(
expr.first, frame, visual_expression.children[0]),
Quasiquote.quasiquote_evaluate(
expr.rest, frame, visual_expression.children[1]))
visual_expression.value = out
gui_holder.complete()
return out
else:
visual_expression.value = expr
gui_holder.complete()
return expr
def string_exec(strings, out, visualize_tail_calls, global_frame=None):
import log
empty = False
if global_frame is None:
empty = True
from environment import build_global_frame
log.logger.f_delta -= 1
global_frame = build_global_frame()
log.logger.active_frames.pop(0) # clear builtin frame
log.logger.f_delta += 1
log.logger.global_frame = log.logger.frame_lookup[id(global_frame)]
log.logger.graphics_lookup[id(global_frame)] = Canvas()
log.logger.export_states = []
log.logger.roots = []
log.logger.frame_updates = []
log.logger._out = []
log.logger.visualize_tail_calls(visualize_tail_calls)
for i, string in enumerate(strings):
try:
if not string.strip():
continue
buff = TokenBuffer([string])
while not buff.done:
expr = get_expression(buff)
if expr is None:
continue
empty = False
log.logger.new_expr()
holder = Holder(expr, None)
Root.setroot(holder)
res = evaluate(expr, global_frame, holder)
if res is not Undefined:
out(res)
if not log.logger.fragile and log.logger.autodraw:
try:
log.logger.raw_out("AUTODRAW" +
json.dumps([log.logger.i, log.logger.heap.record(res)]) + "\n")
except RecursionError:
pass
except (SchemeError, ZeroDivisionError, RecursionError, ValueError) as e:
if isinstance(e, ParseError):
log.logger.new_expr()
raise
if not log.logger.fragile:
log.logger.raw_out("Traceback (most recent call last)\n")
for j, expr in enumerate(log.logger.eval_stack[:MAX_TRACEBACK_LENGTH - 1]):
log.logger.raw_out(str(j).ljust(3) + " " + expr + "\n")
truncated = len(log.logger.eval_stack) - MAX_TRACEBACK_LENGTH
if len(log.logger.eval_stack) > MAX_TRACEBACK_LENGTH:
log.logger.raw_out(f"[{truncated} lines omitted from traceback]\n")
log.logger.raw_out(
str(len(log.logger.eval_stack) - 1).ljust(3) + " " + log.logger.eval_stack[-1] + "\n"
)
log.logger.out(e)
except TimeLimitException:
if not log.logger.fragile:
log.logger.out("Time limit exceeded.")
log.logger.new_expr()
if empty:
log.logger.new_expr()
holder = Holder(Undefined, None)
Root.setroot(holder)
evaluate(Undefined, global_frame, holder)
log.logger.new_expr()
def string_exec(strings, out, global_frame=None):
import log
empty = False
if (global_frame is None):
empty = True
from environment import build_global_frame
log.logger.f_delta -= 1
global_frame = build_global_frame()
log.logger.active_frames.pop(0)
log.logger.f_delta += 1
log.logger.global_frame = log.logger.frame_lookup[id(global_frame)]
log.logger.graphics_lookup[id(global_frame)] = Canvas()
log.logger.export_states = []
log.logger.roots = []
log.logger.frame_updates = []
log.logger._out = []
for (i, string) in enumerate(strings):
try:
if (not string.strip()):
continue
buff = TokenBuffer([string])
while (not buff.done):
expr = get_expression(buff)
if (expr is None):
continue
empty = False
log.logger.new_expr()
holder = Holder(expr, None)
Root.setroot(holder)
res = evaluate(expr, global_frame, holder)
if (res is not Undefined):
out(res)
if ((not log.logger.fragile) and log.logger.autodraw
and isinstance(res, Pair)):
log.logger.raw_out((('AUTODRAW' + json.dumps(
[log.logger.i,
log.logger.heap.record(res)])) + '\n'))
except (SchemeError, ZeroDivisionError, RecursionError,
ValueError) as e:
if isinstance(e, ParseError):
log.logger.new_expr()
raise
if (not log.logger.fragile):
log.logger.raw_out('Traceback (most recent call last)\n')
for (j, expr) in enumerate(
log.logger.eval_stack[:(MAX_TRACEBACK_LENGTH - 1)]):
log.logger.raw_out(
(((str(j).ljust(3) + ' ') + expr) + '\n'))
truncated = (len(log.logger.eval_stack) - MAX_TRACEBACK_LENGTH)
if (len(log.logger.eval_stack) > MAX_TRACEBACK_LENGTH):
log.logger.raw_out(''.join([
'[', '{}'.format(truncated),
' lines omitted from traceback]\n'
]))
log.logger.raw_out((((str(
(len(log.logger.eval_stack) - 1)).ljust(3) + ' ') +
log.logger.eval_stack[(-1)]) + '\n'))
log.logger.out(e)
except TimeLimitException:
if (not log.logger.fragile):
log.logger.out('Time limit exceeded.')
log.logger.new_expr()
if empty:
log.logger.new_expr()
holder = Holder(Undefined, None)
Root.setroot(holder)
evaluate(Undefined, global_frame, holder)
log.logger.new_expr()