def read(self):
if self.pending:
return self.pending.pop()
if self.pos < self.length:
c = el.at(self.string, self.pos)
self.pos += 1
return c
def eval_sub(form, *, macroexpanding=False, **kws):
if accessor_literal_p(form):
return form
if el.symbolp(form):
# look up its binding in the lexical environment.
lex_binding = el.assq(form, V.internal_interpreter_environment)
if el.consp(lex_binding):
return el.at(lex_binding, 1)
else:
return symbol_value(form)
if not el.consp(form):
return form
original_fun = XCAR(form)
original_args = XCDR(form)
fun = indirect_function(original_fun)
mac = CONSP(fun) and el.hd(fun, 'macro')
if mac:
fun = indirect_function(XCAR(XCDR(fun)))
elif macroexpanding:
return form
args_left = [arg for arg in original_args]
if CONSP(fun):
fun = eval_sub(fun)
if not SUBRP(fun):
import pdb
pdb.set_trace()
raise NotImplementedError()
else:
maxargs = XSUBR_max_args(fun)
if maxargs == UNEVALLED or mac:
val = fun(*args_left, **kws)
elif maxargs == MANY:
vals = []
while CONSP(args_left):
arg = XCAR(args_left)
if el.keywordp(arg):
k = arg[1:]
args_left = XCDR(args_left)
arg = XCAR(args_left)
args_left = XCDR(args_left)
kws[k] = eval_sub(arg)
else:
args_left = XCDR(args_left)
vals.append(eval_sub(arg))
val = fun(*vals, **kws)
else:
import pdb
pdb.set_trace()
raise NotImplementedError()
argvals = []
for i in range(maxargs):
argvals.append(eval_sub(XCAR(args_left)))
args_left = XCDR(args_left)
val = fun(*argvals, **kws)
if mac and not macroexpanding:
val = eval_sub(val)
return val
def get__special(place, key):
if not el.stringp(key) and not INTP(key):
raise ValueError("%get expected an index for key: {}".format(
['%get', place, key]))
parts = accessor(key)
while parts:
key, *parts = parts
if INTP(key):
place = el.at(place, key)
else:
place = util.get_obj_from_module(place, key)
return place
def get_place(place, setfn):
place = macroexpand_1(place)
if el.atom(place) or \
(el.hd(place, "get") and el.nilp(getenv("get", "place-expander"))) or \
accessor_literal_p(el.at(place, 1)):
return setfn(place, lambda v: ["%set", place, v])
else:
head = el.hd(place)
gf = getenv(head, "place-expander")
if not el.nilp(gf):
return apply(gf, setfn, el.tl(place))
else:
return error(str(place) + " is not a valid place expression")
def parse_accessor(key, out=None):
if out is None:
out = []
if accessor_literal_p(key):
i = search(key, '.', 1)
while i is not None and el.at(key, i - 1) == '\\':
i = search(key, '.', i + 1)
out.append(maybe_number(key[1:i]))
if i is not None:
key = key[i:]
else:
key = ''
return parse_accessor(key, out)
if key:
out.append(maybe_number(key))
return out
def search_until(s, char, pos=1, backspace=True):
i = search(s, char, pos)
while i is not None and backspace and el.at(s, i - 1) == '\\':
i = search(s, char, i + 1)
return i
def peek(self):
if self.pending:
return self.pending[-1]
if self.pos < self.length:
return el.at(self.string, self.pos)
def maybe_number(x):
if el.stringp(x) and el.at(x, 0) == '-' and el.numeric(x[1:]):
return int(x)
if el.numeric(x):
return int(x)
return x
def id_literal_p(x):
return el.stringp(x) and el.at(x, 0) == "|"
def accessor_literal_p(x):
return el.stringp(x) and \
el.at(x, 0) == "." and \
el.at(x, 1) != "." and \
el.some(x)
