# -*- coding: utf-8 -*-
#
# Copyright © 2014, 2015, 2017 Simon Forman
#
# This file is part of joy.py
#
# joy.py is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# joy.py is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with joy.py. If not see .
#
from inspect import getdoc
import operator, math
from .parser import text_to_expression, Symbol
from .utils.stack import list_to_stack, iter_stack, pick, pushback
ALIASES = (
('add', ['+']),
('and', ['&']),
('mul', ['*']),
('truediv', ['/']),
('mod', ['%', 'rem', 'remainder', 'modulus']),
('eq', ['=']),
('ge', ['>=']),
('getitem', ['pick', 'at']),
('gt', ['>']),
('le', ['<=']),
('lshift', ['<<']),
('lt', ['<']),
('ne', ['<>', '!=']),
('rshift', ['>>']),
('sub', ['-']),
('xor', ['^']),
('succ', ['++']),
('pred', ['--']),
('rolldown', ['roll<']),
('rollup', ['roll>']),
('id', ['•']),
)
def add_aliases(D, A=ALIASES):
'''
Given a dict and a iterable of (name, [alias, ...]) pairs, create
additional entries in the dict mapping each alias to the named function
if it's in the dict. Aliases for functions not in the dict are ignored.
'''
for name, aliases in A:
try:
F = D[name]
except KeyError:
continue
for alias in aliases:
D[alias] = F
definitions = ('''\
second == rest first
third == rest rest first
of == swap at
product == 1 swap [*] step
swons == swap cons
swoncat == swap concat
flatten == [] swap [concat] step
unit == [] cons
quoted == [unit] dip
unquoted == [i] dip
enstacken == stack [clear] dip
disenstacken == ? [uncons ?] loop pop
? == dup truthy
dinfrirst == dip infra first
nullary == [stack] dinfrirst
unary == [stack [pop] dip] dinfrirst
binary == [stack [popop] dip] dinfrirst
ternary == [stack [popop pop] dip] dinfrirst
pam == [i] map
run == [] swap infra
sqr == dup mul
size == 0 swap [pop ++] step
cleave == [i] app2 [popd] dip
average == [sum 1.0 *] [size] cleave /
gcd == 1 [tuck modulus dup 0 >] loop pop
least_fraction == dup [gcd] infra [div] concat map
*fraction == [uncons] dip uncons [swap] dip concat [*] infra [*] dip cons
*fraction0 == concat [[swap] dip * [*] dip] infra
down_to_zero == [0 >] [dup --] while
range_to_zero == unit [down_to_zero] infra
anamorphism == [pop []] swap [dip swons] genrec
range == [0 <=] [1 - dup] anamorphism
while == swap [nullary] cons dup dipd concat loop
dudipd == dup dipd
primrec == [i] genrec
step_zero == 0 roll> step
'''
##Zipper
##z-down == [] swap uncons swap
##z-up == swons swap shunt
##z-right == [swons] cons dip uncons swap
##z-left == swons [uncons swap] dip swap
##Quadratic Formula
##divisor == popop 2 *
##minusb == pop neg
##radical == swap dup * rollup * 4 * - sqrt
##root1 == + swap /
##root2 == - swap /
##q0 == [[divisor] [minusb] [radical]] pam
##q1 == [[root1] [root2]] pam
##quadratic == [q0] ternary i [q1] ternary
# Project Euler
##'''\
##PE1.1 == + dup [+] dip
##PE1.2 == dup [3 & PE1.1] dip 2 >>
##PE1.3 == 14811 swap [PE1.2] times pop
##PE1 == 0 0 66 [7 PE1.3] times 4 PE1.3 pop
##'''
#PE1.2 == [PE1.1] step
#PE1 == 0 0 66 [[3 2 1 3 1 2 3] PE1.2] times [3 2 1 3] PE1.2 pop
)
class FunctionWrapper(object):
'''
Allow functions to have a nice repr().
At some point it's likely this class and its subclasses would gain
machinery to support type checking and inference.
'''
def __init__(self, f):
self.f = f
self.name = f.__name__.rstrip('_') # Don't shadow builtins.
self.__doc__ = f.__doc__ or str(f)
def __call__(self, stack, expression, dictionary):
'''
Functions in general receive and return all three.
'''
return self.f(stack, expression, dictionary)
def __repr__(self):
return self.name
class SimpleFunctionWrapper(FunctionWrapper):
'''
Wrap functions that take and return just a stack.
'''
def __call__(self, stack, expression, dictionary):
return self.f(stack), expression, dictionary
class BinaryBuiltinWrapper(FunctionWrapper):
'''
Wrap functions that take two arguments and return a single result.
'''
def __call__(self, stack, expression, dictionary):
(a, (b, stack)) = stack
result = self.f(b, a)
return (result, stack), expression, dictionary
class UnaryBuiltinWrapper(FunctionWrapper):
'''
Wrap functions that take one argument and return a single result.
'''
def __call__(self, stack, expression, dictionary):
(a, stack) = stack
result = self.f(a)
return (result, stack), expression, dictionary
class DefinitionWrapper(FunctionWrapper):
'''
Provide implementation of defined functions, and some helper methods.
'''
def __init__(self, name, body_text, doc=None):
self.name = self.__name__ = name
self.body = text_to_expression(body_text)
self._body = tuple(iter_stack(self.body))
self.__doc__ = doc or body_text
def __call__(self, stack, expression, dictionary):
expression = list_to_stack(self._body, expression)
return stack, expression, dictionary
@classmethod
def parse_definition(class_, defi):
'''
Given some text describing a Joy function definition parse it and
return a DefinitionWrapper.
'''
name, proper, body_text = (n.strip() for n in defi.partition('=='))
if not proper:
raise ValueError('Definition %r failed' % (defi,))
return class_(name, body_text)
@classmethod
def add_definitions(class_, defs, dictionary):
for definition in _text_to_defs(defs):
class_.add_def(definition, dictionary)
@classmethod
def add_def(class_, definition, dictionary):
F = class_.parse_definition(definition)
dictionary[F.name] = F
def _text_to_defs(text):
return filter(None, (line.strip() for line in text.splitlines()))
#
# Functions
#
def parse((text, stack)):
'''Parse the string on the stack to a Joy expression.'''
expression = text_to_expression(text)
return expression, stack
def first(((head, tail), stack)):
'''first == uncons pop'''
return head, stack
def rest(((head, tail), stack)):
'''rest == uncons popd'''
return tail, stack
def truthy(stack):
'''Coerce the item on the top of the stack to its Boolean value.'''
n, stack = stack
return bool(n), stack
def getitem(stack):
'''
getitem == drop first
Expects an integer and a quote on the stack and returns the item at the
nth position in the quote counting from 0.
[a b c d] 0 getitem
-------------------------
a
'''
n, (Q, stack) = stack
return pick(Q, n), stack
def drop(stack):
'''
drop == [rest] times
Expects an integer and a quote on the stack and returns the quote with
n items removed off the top.
[a b c d] 2 drop
----------------------
[c d]
'''
n, (Q, stack) = stack
while n > 0:
try:
_, Q = Q
except ValueError:
raise IndexError
n -= 1
return Q, stack
def take(stack):
'''
Expects an integer and a quote on the stack and returns the quote with
just the top n items in reverse order (because that's easier and you can
use reverse if needed.)
[a b c d] 2 take
----------------------
[b a]
'''
n, (Q, stack) = stack
x = ()
while n > 0:
try:
item, Q = Q
except ValueError:
raise IndexError
x = item, x
n -= 1
return x, stack
def choice(stack):
'''
Use a Boolean value to select one of two items.
A B False choice
----------------------
A
A B True choice
---------------------
B
Currently Python semantics are used to evaluate the "truthiness" of the
Boolean value (so empty string, zero, etc. are counted as false, etc.)
'''
(if_, (then, (else_, stack))) = stack
return then if if_ else else_, stack
def select(stack):
'''
Use a Boolean value to select one of two items from a sequence.
[A B] False select
------------------------
A
[A B] True select
-----------------------
B
The sequence can contain more than two items but not fewer.
Currently Python semantics are used to evaluate the "truthiness" of the
Boolean value (so empty string, zero, etc. are counted as false, etc.)
'''
(flag, (choices, stack)) = stack
(else_, (then, _)) = choices
return then if flag else else_, stack
def max_(S):
'''Given a list find the maximum.'''
tos, stack = S
return max(iter_stack(tos)), stack
def min_(S):
'''Given a list find the minimum.'''
tos, stack = S
return min(iter_stack(tos)), stack
def sum_(S):
'''Given a quoted sequence of numbers return the sum.
sum == 0 swap [+] step
'''
tos, stack = S
return sum(iter_stack(tos)), stack
def remove(S):
'''
Expects an item on the stack and a quote under it and removes that item
from the the quote. The item is only removed once.
[1 2 3 1] 1 remove
------------------------
[2 3 1]
'''
(tos, (second, stack)) = S
l = list(iter_stack(second))
l.remove(tos)
return list_to_stack(l), stack
def unique(S):
'''Given a list remove duplicate items.'''
tos, stack = S
I = list(iter_stack(tos))
list_to_stack(sorted(set(I), key=I.index))
return list_to_stack(sorted(set(I), key=I.index)), stack
def sort_(S):
'''Given a list return it sorted.'''
tos, stack = S
return list_to_stack(sorted(iter_stack(tos))), stack
def cons(S):
'''
The cons operator expects a list on top of the stack and the potential
member below. The effect is to add the potential member into the
aggregate.
'''
(tos, (second, stack)) = S
return (second, tos), stack
def uncons(S):
'''
Inverse of cons, removes an item from the top of the list on the stack
and places it under the remaining list.
'''
(tos, stack) = S
item, tos = tos
return tos, (item, stack)
def clear(stack):
'''Clear everything from the stack.
... clear
---------------
'''
return ()
def dup(S):
'''Duplicate the top item on the stack.'''
(tos, stack) = S
return tos, (tos, stack)
def over(S):
'''
Copy the second item down on the stack to the top of the stack.
a b over
--------------
a b a
'''
second = S[1][0]
return second, S
def tuck(S):
'''
Copy the item at TOS under the second item of the stack.
a b tuck
--------------
b a b
'''
(tos, (second, stack)) = S
return tos, (second, (tos, stack))
def swap(S):
'''Swap the top two items on stack.'''
(tos, (second, stack)) = S
return second, (tos, stack)
def swaack(stack):
'''swap stack'''
old_stack, stack = stack
return stack, old_stack
def stack_(stack):
'''
The stack operator pushes onto the stack a list containing all the
elements of the stack.
'''
return stack, stack
def unstack(S):
'''
The unstack operator expects a list on top of the stack and makes that
the stack discarding the rest of the stack.
'''
(tos, stack) = S
return tos
def pop(S):
'''Pop and discard the top item from the stack.'''
(tos, stack) = S
return stack
def popd(S):
'''Pop and discard the second item from the stack.'''
(tos, (second, stack)) = S
return tos, stack
def popdd(S):
'''Pop and discard the third item from the stack.'''
(tos, (second, (third, stack))) = S
return tos, (second, stack)
def popop(S):
'''Pop and discard the first and second items from the stack.'''
(tos, (second, stack)) = S
return stack
def dupd(S):
'''Duplicate the second item on the stack.'''
(tos, (second, stack)) = S
return tos, (second, (second, stack))
def reverse(S):
'''Reverse the list on the top of the stack.
reverse == [] swap shunt
'''
(tos, stack) = S
res = ()
for term in iter_stack(tos):
res = term, res
return res, stack
def concat(S):
'''Concatinate the two lists on the top of the stack.'''
(tos, (second, stack)) = S
for term in reversed(list(iter_stack(second))):
tos = term, tos
return tos, stack
def shunt((tos, (second, stack))):
'''
shunt == [swons] step
Like concat but reverses the top list into the second.
'''
while tos:
term, tos = tos
second = term, second
return second, stack
def zip_(S):
'''
Replace the two lists on the top of the stack with a list of the pairs
from each list. The smallest list sets the length of the result list.
'''
(tos, (second, stack)) = S
accumulator = [
(a, (b, ()))
for a, b in zip(iter_stack(tos), iter_stack(second))
]
return list_to_stack(accumulator), stack
def succ(S):
'''Increment TOS.'''
(tos, stack) = S
return tos + 1, stack
def pred(S):
'''Decrement TOS.'''
(tos, stack) = S
return tos - 1, stack
def pm(stack):
'''
Plus or minus
a b pm
-------------
a+b a-b
'''
a, (b, stack) = stack
p, m, = b + a, b - a
return m, (p, stack)
def floor(n):
return int(math.floor(n))
floor.__doc__ = math.floor.__doc__
def divmod_(S):
a, (b, stack) = S
d, m = divmod(a, b)
return d, (m, stack)
divmod_.__doc__ = divmod.__doc__
def sqrt(a):
'''
Return the square root of the number a.
Negative numbers return complex roots.
'''
try:
r = math.sqrt(a)
except ValueError:
assert a < 0, repr(a)
r = math.sqrt(-a) * 1j
return r
def rollup(S):
'''a b c -> b c a'''
(a, (b, (c, stack))) = S
return b, (c, (a, stack))
def rolldown(S):
'''a b c -> c a b'''
(a, (b, (c, stack))) = S
return c, (a, (b, stack))
#def execute(S):
# (text, stack) = S
# if isinstance(text, str):
# return run(text, stack)
# return stack
def id_(stack):
return stack
def void(stack):
form, stack = stack
return _void(form), stack
def _void(form):
return any(not _void(i) for i in iter_stack(form))
## transpose
## sign
## take
def words(stack, expression, dictionary):
'''Print all the words in alphabetical order.'''
print(' '.join(sorted(dictionary)))
return stack, expression, dictionary
def sharing(stack, expression, dictionary):
'''Print redistribution information.'''
print("You may convey verbatim copies of the Program's source code as"
' you receive it, in any medium, provided that you conspicuously'
' and appropriately publish on each copy an appropriate copyright'
' notice; keep intact all notices stating that this License and'
' any non-permissive terms added in accord with section 7 apply'
' to the code; keep intact all notices of the absence of any'
' warranty; and give all recipients a copy of this License along'
' with the Program.'
' You should have received a copy of the GNU General Public License'
' along with Joypy. If not see .')
return stack, expression, dictionary
def warranty(stack, expression, dictionary):
'''Print warranty information.'''
print('THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY'
' APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE'
' COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM'
' "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR'
' IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES'
' OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE'
' ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS'
' WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE'
' COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.')
return stack, expression, dictionary
# def simple_manual(stack):
# '''
# Print words and help for each word.
# '''
# for name, f in sorted(FUNCTIONS.items()):
# d = getdoc(f)
# boxline = '+%s+' % ('-' * (len(name) + 2))
# print('\n'.join((
# boxline,
# '| %s |' % (name,),
# boxline,
# d if d else ' ...',
# '',
# '--' * 40,
# '',
# )))
# return stack
def help_(S, expression, dictionary):
'''Accepts a quoted symbol on the top of the stack and prints its docs.'''
((symbol, _), stack) = S
word = dictionary[symbol]
print(getdoc(word))
return stack, expression, dictionary
#
# § Combinators
#
# Several combinators depend on other words in their definitions,
# we use symbols to prevent hard-coding these, so in theory, you
# could change the word in the dictionary to use different semantics.
S_choice = Symbol('choice')
S_first = Symbol('first')
S_getitem = Symbol('getitem')
S_genrec = Symbol('genrec')
S_loop = Symbol('loop')
S_i = Symbol('i')
S_ifte = Symbol('ifte')
S_infra = Symbol('infra')
S_step = Symbol('step')
S_times = Symbol('times')
S_swaack = Symbol('swaack')
S_truthy = Symbol('truthy')
def i(stack, expression, dictionary):
'''
The i combinator expects a quoted program on the stack and unpacks it
onto the pending expression for evaluation.
[Q] i
-----------
Q
'''
quote, stack = stack
return stack, pushback(quote, expression), dictionary
def x(stack, expression, dictionary):
'''
x == dup i
... [Q] x = ... [Q] dup i
... [Q] x = ... [Q] [Q] i
... [Q] x = ... [Q] Q
'''
quote, _ = stack
return stack, pushback(quote, expression), dictionary
def b(stack, expression, dictionary):
'''
b == [i] dip i
... [P] [Q] b == ... [P] i [Q] i
... [P] [Q] b == ... P Q
'''
q, (p, (stack)) = stack
return stack, pushback(p, pushback(q, expression)), dictionary
def dupdip(stack, expression, dictionary):
'''
[F] dupdip == dup [F] dip
... a [F] dupdip
... a dup [F] dip
... a a [F] dip
... a F a
'''
F, stack = stack
a = stack[0]
return stack, pushback(F, (a, expression)), dictionary
def infra(stack, expression, dictionary):
'''
Accept a quoted program and a list on the stack and run the program
with the list as its stack.
... [a b c] [Q] . infra
-----------------------------
c b a . Q [...] swaack
'''
(quote, (aggregate, stack)) = stack
return aggregate, pushback(quote, (stack, (S_swaack, expression))), dictionary
def genrec(stack, expression, dictionary):
'''
General Recursion Combinator.
[if] [then] [rec1] [rec2] genrec
---------------------------------------------------------------------
[if] [then] [rec1 [[if] [then] [rec1] [rec2] genrec] rec2] ifte
From "Recursion Theory and Joy" (j05cmp.html) by Manfred von Thun:
"The genrec combinator takes four program parameters in addition to
whatever data parameters it needs. Fourth from the top is an if-part,
followed by a then-part. If the if-part yields true, then the then-part
is executed and the combinator terminates. The other two parameters are
the rec1-part and the rec2-part. If the if-part yields false, the
rec1-part is executed. Following that the four program parameters and
the combinator are again pushed onto the stack bundled up in a quoted
form. Then the rec2-part is executed, where it will find the bundled
form. Typically it will then execute the bundled form, either with i or
with app2, or some other combinator."
The way to design one of these is to fix your base case [then] and the
test [if], and then treat rec1 and rec2 as an else-part "sandwiching"
a quotation of the whole function.
For example, given a (general recursive) function 'F':
F == [I] [T] [R1] [R2] genrec
If the [I] if-part fails you must derive R1 and R2 from:
... R1 [F] R2
Just set the stack arguments in front, and figure out what R1 and R2
have to do to apply the quoted [F] in the proper way. In effect, the
genrec combinator turns into an ifte combinator with a quoted copy of
the original definition in the else-part:
F == [I] [T] [R1] [R2] genrec
== [I] [T] [R1 [F] R2] ifte
(Primitive recursive functions are those where R2 == i.
P == [I] [T] [R] primrec
== [I] [T] [R [P] i] ifte
== [I] [T] [R P] ifte
)
'''
(rec2, (rec1, stack)) = stack
(then, (if_, _)) = stack
F = (if_, (then, (rec1, (rec2, (S_genrec, ())))))
else_ = pushback(rec1, (F, rec2))
return (else_, stack), (S_ifte, expression), dictionary
def map_(S, expression, dictionary):
'''
Run the quoted program on TOS on the items in the list under it, push a
new list with the results (in place of the program and original list.
'''
# (quote, (aggregate, stack)) = S
# results = list_to_stack([
# joy((term, stack), quote, dictionary)[0][0]
# for term in iter_stack(aggregate)
# ])
# return (results, stack), expression, dictionary
(quote, (aggregate, stack)) = S
if not aggregate:
return (aggregate, stack), expression, dictionary
batch = ()
for term in iter_stack(aggregate):
s = term, stack
batch = (s, (quote, (S_infra, (S_first, batch))))
stack = (batch, ((), stack))
return stack, (S_infra, expression), dictionary
#def cleave(S, expression, dictionary):
# '''
# The cleave combinator expects two quotations, and below that an item X.
# It first executes [P], with X on top, and saves the top result element.
# Then it executes [Q], again with X, and saves the top result.
# Finally it restores the stack to what it was below X and pushes the two
# results P(X) and Q(X).
# '''
# (Q, (P, (x, stack))) = S
# p = joy((x, stack), P, dictionary)[0][0]
# q = joy((x, stack), Q, dictionary)[0][0]
# return (q, (p, stack)), expression, dictionary
def branch(stack, expression, dictionary):
'''
Use a Boolean value to select one of two quoted programs to run.
branch == roll< choice i
False [F] [T] branch
--------------------------
F
True [F] [T] branch
-------------------------
T
'''
(then, (else_, (flag, stack))) = stack
return stack, pushback(then if flag else else_, expression), dictionary
def ifte(stack, expression, dictionary):
'''
If-Then-Else Combinator
... [if] [then] [else] ifte
---------------------------------------------------
... [[else] [then]] [...] [if] infra select i
... [if] [then] [else] ifte
-------------------------------------------------------
... [else] [then] [...] [if] infra first choice i
Has the effect of grabbing a copy of the stack on which to run the
if-part using infra.
'''
(else_, (then, (if_, stack))) = stack
expression = (S_infra, (S_first, (S_choice, (S_i, expression))))
stack = (if_, (stack, (then, (else_, stack))))
return stack, expression, dictionary
def dip(stack, expression, dictionary):
'''
The dip combinator expects a quoted program on the stack and below it
some item, it hoists the item into the expression and runs the program
on the rest of the stack.
... x [Q] dip
-------------------
... Q x
'''
(quote, (x, stack)) = stack
expression = (x, expression)
return stack, pushback(quote, expression), dictionary
def dipd(S, expression, dictionary):
'''
Like dip but expects two items.
... y x [Q] dip
---------------------
... Q y x
'''
(quote, (x, (y, stack))) = S
expression = (y, (x, expression))
return stack, pushback(quote, expression), dictionary
def dipdd(S, expression, dictionary):
'''
Like dip but expects three items.
... z y x [Q] dip
-----------------------
... Q z y x
'''
(quote, (x, (y, (z, stack)))) = S
expression = (z, (y, (x, expression)))
return stack, pushback(quote, expression), dictionary
def app1(S, expression, dictionary):
'''
Given a quoted program on TOS and anything as the second stack item run
the program and replace the two args with the first result of the
program.
... x [Q] . app1
-----------------------------------
... [x ...] [Q] . infra first
'''
(quote, (x, stack)) = S
stack = (quote, ((x, stack), stack))
expression = (S_infra, (S_first, expression))
return stack, expression, dictionary
def app2(S, expression, dictionary):
'''Like app1 with two items.
... y x [Q] . app2
-----------------------------------
... [y ...] [Q] . infra first
[x ...] [Q] infra first
'''
(quote, (x, (y, stack))) = S
expression = (S_infra, (S_first,
((x, stack), (quote, (S_infra, (S_first,
expression))))))
stack = (quote, ((y, stack), stack))
return stack, expression, dictionary
def app3(S, expression, dictionary):
'''Like app1 with three items.
... z y x [Q] . app3
-----------------------------------
... [z ...] [Q] . infra first
[y ...] [Q] infra first
[x ...] [Q] infra first
'''
(quote, (x, (y, (z, stack)))) = S
expression = (S_infra, (S_first,
((y, stack), (quote, (S_infra, (S_first,
((x, stack), (quote, (S_infra, (S_first,
expression))))))))))
stack = (quote, ((z, stack), stack))
return stack, expression, dictionary
def step(S, expression, dictionary):
'''
Run a quoted program on each item in a sequence.
... [] [Q] . step
-----------------------
... .
... [a] [Q] . step
------------------------
... a . Q
... [a b c] [Q] . step
----------------------------------------
... a . Q [b c] [Q] step
The step combinator executes the quotation on each member of the list
on top of the stack.
'''
(quote, (aggregate, stack)) = S
if not aggregate:
return stack, expression, dictionary
head, tail = aggregate
stack = quote, (head, stack)
if tail:
expression = tail, (quote, (S_step, expression))
expression = S_i, expression
return stack, expression, dictionary
def times(stack, expression, dictionary):
'''
times == [-- dip] cons [swap] infra [0 >] swap while pop
... n [Q] . times
--------------------- w/ n <= 0
... .
... 1 [Q] . times
---------------------------------
... . Q
... n [Q] . times
--------------------------------- w/ n > 1
... . Q (n - 1) [Q] times
'''
# times == [-- dip] cons [swap] infra [0 >] swap while pop
(quote, (n, stack)) = stack
if n <= 0:
return stack, expression, dictionary
n -= 1
if n:
expression = n, (quote, (S_times, expression))
expression = pushback(quote, expression)
return stack, expression, dictionary
# The current definition above works like this:
# [P] [Q] while
# --------------------------------------
# [P] nullary [Q [P] nullary] loop
# while == [pop i not] [popop] [dudipd] primrec
#def while_(S, expression, dictionary):
# '''[if] [body] while'''
# (body, (if_, stack)) = S
# while joy(stack, if_, dictionary)[0][0]:
# stack = joy(stack, body, dictionary)[0]
# return stack, expression, dictionary
def loop(stack, expression, dictionary):
'''
Basic loop combinator.
... True [Q] loop
-----------------------
... Q [Q] loop
... False [Q] loop
------------------------
...
'''
quote, (flag, stack) = stack
if flag:
expression = pushback(quote, (quote, (S_loop, expression)))
return stack, expression, dictionary
#def nullary(S, expression, dictionary):
# '''
# Run the program on TOS and return its first result without consuming
# any of the stack (except the program on TOS.)
# '''
# (quote, stack) = S
# result = joy(stack, quote, dictionary)
# return (result[0][0], stack), expression, dictionary
#
#
#def unary(S, expression, dictionary):
# (quote, stack) = S
# _, return_stack = stack
# result = joy(stack, quote, dictionary)[0]
# return (result[0], return_stack), expression, dictionary
#
#
#def binary(S, expression, dictionary):
# (quote, stack) = S
# _, (_, return_stack) = stack
# result = joy(stack, quote, dictionary)[0]
# return (result[0], return_stack), expression, dictionary
#
#
#def ternary(S, expression, dictionary):
# (quote, stack) = S
# _, (_, (_, return_stack)) = stack
# result = joy(stack, quote, dictionary)[0]
# return (result[0], return_stack), expression, dictionary
builtins = (
BinaryBuiltinWrapper(operator.add),
BinaryBuiltinWrapper(operator.and_),
BinaryBuiltinWrapper(operator.div),
BinaryBuiltinWrapper(operator.eq),
BinaryBuiltinWrapper(operator.floordiv),
BinaryBuiltinWrapper(operator.ge),
BinaryBuiltinWrapper(operator.gt),
BinaryBuiltinWrapper(operator.le),
BinaryBuiltinWrapper(operator.lshift),
BinaryBuiltinWrapper(operator.lt),
BinaryBuiltinWrapper(operator.mod),
BinaryBuiltinWrapper(operator.mul),
BinaryBuiltinWrapper(operator.ne),
BinaryBuiltinWrapper(operator.or_),
BinaryBuiltinWrapper(operator.pow),
BinaryBuiltinWrapper(operator.rshift),
BinaryBuiltinWrapper(operator.sub),
BinaryBuiltinWrapper(operator.truediv),
BinaryBuiltinWrapper(operator.xor),
UnaryBuiltinWrapper(abs),
UnaryBuiltinWrapper(floor),
UnaryBuiltinWrapper(operator.neg),
UnaryBuiltinWrapper(operator.not_),
UnaryBuiltinWrapper(sqrt),
)
combinators = (
FunctionWrapper(app1),
FunctionWrapper(app2),
FunctionWrapper(app3),
FunctionWrapper(b),
FunctionWrapper(branch),
# FunctionWrapper(binary),
# FunctionWrapper(cleave),
FunctionWrapper(dip),
FunctionWrapper(dipd),
FunctionWrapper(dipdd),
FunctionWrapper(dupdip),
FunctionWrapper(genrec),
FunctionWrapper(help_),
FunctionWrapper(i),
FunctionWrapper(ifte),
FunctionWrapper(infra),
FunctionWrapper(loop),
FunctionWrapper(map_),
# FunctionWrapper(nullary),
FunctionWrapper(step),
FunctionWrapper(times),
# FunctionWrapper(ternary),
# FunctionWrapper(unary),
# FunctionWrapper(while_),
FunctionWrapper(words),
FunctionWrapper(x),
)
primitives = (
SimpleFunctionWrapper(choice),
SimpleFunctionWrapper(clear),
SimpleFunctionWrapper(concat),
SimpleFunctionWrapper(cons),
SimpleFunctionWrapper(divmod_),
SimpleFunctionWrapper(drop),
SimpleFunctionWrapper(dup),
SimpleFunctionWrapper(dupd),
SimpleFunctionWrapper(first),
SimpleFunctionWrapper(getitem),
SimpleFunctionWrapper(id_),
SimpleFunctionWrapper(max_),
SimpleFunctionWrapper(min_),
SimpleFunctionWrapper(over),
SimpleFunctionWrapper(parse),
SimpleFunctionWrapper(pm),
SimpleFunctionWrapper(pop),
SimpleFunctionWrapper(popd),
SimpleFunctionWrapper(popdd),
SimpleFunctionWrapper(popop),
SimpleFunctionWrapper(pred),
SimpleFunctionWrapper(remove),
SimpleFunctionWrapper(rest),
SimpleFunctionWrapper(reverse),
SimpleFunctionWrapper(rolldown),
SimpleFunctionWrapper(rollup),
SimpleFunctionWrapper(select),
SimpleFunctionWrapper(shunt),
SimpleFunctionWrapper(sort_),
SimpleFunctionWrapper(stack_),
SimpleFunctionWrapper(succ),
SimpleFunctionWrapper(sum_),
SimpleFunctionWrapper(swaack),
SimpleFunctionWrapper(swap),
SimpleFunctionWrapper(take),
SimpleFunctionWrapper(truthy),
SimpleFunctionWrapper(tuck),
SimpleFunctionWrapper(uncons),
SimpleFunctionWrapper(unique),
SimpleFunctionWrapper(unstack),
SimpleFunctionWrapper(unstack),
SimpleFunctionWrapper(void),
SimpleFunctionWrapper(zip_),
FunctionWrapper(sharing),
FunctionWrapper(warranty),
)
def initialize(dictionary=None):
if dictionary is None:
dictionary = {}
dictionary.update((F.name, F) for F in builtins)
dictionary.update((F.name, F) for F in combinators)
dictionary.update((F.name, F) for F in primitives)
add_aliases(dictionary)
DefinitionWrapper.add_definitions(definitions, dictionary)
return dictionary