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#!/usr/bin/env nomsu -V3.6.5.6
#
This file contains code that supports manipulating and using collections like lists
and dictionaries.
use "core/metaprogramming.nom"
use "core/control_flow.nom"
use "core/operators.nom"
# List/dict functions:
# Indexing
test:
assume ((2 nd to last in [1, 2, 3, 4, 5]) is 4)
compile [..]
%index st to last in %list, %index nd to last in %list
%index rd to last in %list, %index th to last in %list
..to (Lua value "utils.nth_to_last(\(%list as lua expr), \(%index as lua expr))")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
parse [last in %list] as (1 st to last in %list)
parse [first in %list] as %list.1
# Membership testing
test:
assume (3 is in [1, 2, 3, 4, 5])
action [%item is in %list, %list contains %item, %list has %item]:
for %key = %value in %list:
if (%key is %item): return (yes)
return (no)
test:
assume (99 isn't in [1, 2, 3])
action [..]
%item isn't in %list, %item is not in %list, %list doesn't contain %item
%list does not contain %item, %list doesn't have %item, %list does not have %item
..:
for %key = %value in %list:
if (%key is %item): return (no)
return (yes)
test:
assume ({x:no} has key "x")
parse [%list has key %index, %list has index %index] as (%list.%index != (nil))
test:
assume ({x:no} doesn't have key "y")
assume (not ({x:no} doesn't have key "x"))
parse [..]
%list doesn't have key %index, %list does not have key %index
%list doesn't have index %index, %list does not have index %index
..as (%list.%index == (nil))
compile [number of keys in %list] to (..)
Lua value "utils.size(\(%list as lua expr))"
test:
%list = [1, 2, 3, 4, 5]
append 6 to %list
assume ((last in %list) is 6)
pop from %list
assume ((last in %list) is 5)
remove index 1 from %list
assume ((first in %list) is 2)
compile [..]
append %item to %list, add %item to %list, to %list add %item, to %list append %item
..to (Lua "table.insert(\(%list as lua expr), \(%item as lua expr))")
compile [add %item to %list at index %i] to (..)
Lua ".."
table.insert(\(%list as lua expr), \(%i as lua expr), \(%item as lua expr))
compile [pop from %list, remove last from %list] to (..)
Lua value "table.remove(\(%list as lua expr))"
compile [remove index %index from %list] to (..)
Lua value "table.remove(\(%list as lua expr), \(%index as lua expr))"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# List Comprehension
test:
assume (((% * %) for % in [1, 2, 3]) == [1, 4, 9])
parse [%expression for %item in %iterable] as (..)
result of:
%comprehension = []
for %item in %iterable:
add %expression to %comprehension
return %comprehension
parse [..]
%expression for %index in %start to %stop via %step
%expression for %index in %start to %stop by %step
..as (..)
result of:
%comprehension = []
for %index in %start to %stop via %step:
add %expression to %comprehension
return %comprehension
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test:
assume (((% * %) for % in 1 to 3) == [1, 4, 9])
parse [%expression for %var in %start to %stop] as (..)
%expression for %var in %start to %stop via 1
test:
assume (("\%k,\%v" for %k = %v in {x:1}) == ["x,1"])
parse [..]
%expression for %key = %value in %iterable
%expression for %key %value in %iterable
..as (..)
result of:
%comprehension = []
for %key = %value in %iterable:
add %expression to %comprehension
return %comprehension
# Dict comprehensions
test:
assume (((% * %) = % for % in [1, 2, 3]) == {1:1, 4:2, 9:3})
parse [%key = %value for %item in %iterable, %key %value for %item in %iterable] as
..(..)
result of:
%comprehension = {}
for %item in %iterable:
%comprehension.%key = %value
return %comprehension
test:
assume ((%k = (%v * %v) for %k = %v in {x:1, y:2, z:3}) == {x:1, y:4, z:9})
parse [..]
%key = %value for %src_key = %src_value in %iterable
%key %value for %src_key %src_value in %iterable
..as (..)
result of:
%comprehension = {}
for %src_key = %src_value in %iterable:
%comprehension.%key = %value
return %comprehension
parse [..]
%key = %value for %item in %start to %stop via %step
%key %value for %item in %start to %stop via %step
..as (..)
result of:
%comprehension = {}
for %item in %start to %stop via %step:
%comprehension.%key = %value
return %comprehension
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test:
assume (((% * %) = % for % in 1 to 3) == {1:1, 4:2, 9:3})
parse [..]
%key = %value for %item in %start to %stop
%key %value for %item in %start to %stop
..as (%key = %value for %item in %start to %stop via 1)
test:
assume (([[1, 2], [3, 4]] flattened) == [1, 2, 3, 4])
action [%lists flattened]:
%flat = []
for %list in %lists:
for %item in %list: add %item to %flat
return %flat
test:
assume ((entries in {x:1}) == [{key:"x", value:1}])
parse [entries in %dict] as ({key:%k, value:%v} for %k = %v in %dict)
test:
assume ((keys in {x:1}) == ["x"])
parse [keys in %dict, keys of %dict] as (%k for %k = %v in %dict)
test:
assume ((values in {x:1}) == [1])
parse [values in %dict, values of %dict] as (%v for %k = %v in %dict)
# Metatable stuff
test:
%t = {}
set %t 's metatable to {__tostring:[%] -> "XXX"}
assume ("\%t" == "XXX")
compile [set %dict 's metatable to %metatable] to (..)
Lua "setmetatable(\(%dict as lua expr), \(%metatable as lua expr));"
test:
assume (({} with fallback % -> (% + 1)).10 == 11)
compile [%dict with fallback %key -> %value] to (..)
Lua value ".."
(function(d)
local mt = {}
for k,v in pairs(getmetatable(d) or {}) do mt[k] = v end
mt.__index = function(self, \(%key as lua expr))
local value = \(%value as lua expr)
self[\(%key as lua expr)] = value
return value
end
return setmetatable(d, mt)
end)(\(%dict as lua expr))
# Sorting
test:
%x = [3, 1, 2]
sort %x
assume (%x == [1, 2, 3])
sort %x by % = (- %)
assume (%x == [3, 2, 1])
%keys = {1:999, 2:0, 3:50}
sort %x by % = %keys.%
assume (%x == [2, 3, 1])
compile [sort %items] to (Lua "table.sort(\(%items as lua expr));")
parse [sort %items by %item = %key_expr, sort %items by %item -> %key_expr] as (..)
do:
%keys = ({} with fallback %item -> %key_expr)
lua> "table.sort(\%items, function(x,y) return \%keys[x] < \%keys[y] end)"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test:
assume ((sorted [3, 1, 2]) == [1, 2, 3])
action [%items sorted, sorted %items]:
%copy = (% for % in %items)
sort %copy
return %copy
parse [%items sorted by %item = %key, %items sorted by %item -> %key] as (..)
result of:
%copy = (% for % in %items)
sort %copy by %item = %key
return %copy
test:
assume ((unique [1, 2, 1, 3, 2, 3]) == [1, 2, 3])
action [unique %items]:
%unique = []
%seen = {}
for % in %items:
unless %seen.%:
add % to %unique
%seen.% = (yes)
return %unique
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