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#!/usr/bin/env nomsu -V7.0.0
###
This file contains code that supports manipulating and using collections like lists
and dictionaries.
use "core/metaprogramming"
use "core/control_flow"
use "core/operators"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
### List functionality:
test:
$list = [1, 2, 3, 4, 5]
$visited = {}
for ($i = $x) in $list:
$visited.$i = (yes)
assume ($visited == {.1, .2, .3, .4, .5})
$visited = {}
for $x in $list:
$visited.$x = (yes)
assume ($visited == {.1, .2, .3, .4, .5})
assume (($list, 2 nd to last) == 4)
assume (($list, first) == 1)
assume ($list, has 3)
assume (($list, index of 3) == 3)
assume (#$list == 5)
$list, add 6
assume (($list, last) == 6)
$list, pop
assume (($list, last) == 5)
$list, remove index 1
assume (($list, first) == 2)
assume (([1, 2] + [3, 4]) == [1, 2, 3, 4])
### Dict functionality
test:
$dict = {.x = 1, .y = 2, .z = 3}
assume #$dict == 3
assume [: for ($k = $v) in {.x = 1}: add {.key = $k, .value = $v}] ==
[{.key = "x", .value = 1}]
assume ({.x = 1, .y = 1} + {.y = 10, .z = 10}) == {.x = 1, .y = 11, .z = 10}
assume ({.x = 1, .y = 1} - {.y = 10, .z = 10}) == {.x = 1, .y = -9, .z = -10}
assume ({.x = 1, .y = 1} | {.y = 10, .z = 10}) == {.x = 1, .y = 1, .z = 10}
assume ({.x = 1, .y = 1} & {.y = 10, .z = 10}) == {.y = 1}
assume ({.x = 1, .y = 1} ~ {.y = 10, .z = 10}) == {.x = 1, .z = 10}
### Set compliments:
assume (~{.x}).y
assume ((~{.x}).x == (nil))
$sc = ~{.x, .y}
$sc.y = 99
### For now, whether $sc.y == 99 or $sc.y == (yes) is unspecified,
(but the actual behavior is (yes))
assume ($sc.y and (not $sc.x))
assume ($sc == (~{.x, .y} | {.y = 99}))
### Both sets:
assume (({.x, .y} & {.y, .z}) == {.y})
assume (({.x, .y} | {.y, .z}) == {.x, .y, .z})
assume (({.x, .y} ~ {.y, .z}) == {.z, .x})
### Mixed:
assume (({.x, .y} & ~{.y, .z}) == {.x})
assume (({.x, .y} | ~{.y, .z}) == ~{.z})
assume (({.x, .y} ~ ~{.y, .z}) == ~{.x})
### Mixed reversed:
assume ((~{.y, .z} & {.x, .y}) == {.x})
assume ((~{.y, .z} | {.x, .y}) == ~{.z})
assume ((~{.y, .z} ~ {.x, .y}) == ~{.x})
### Both set compliments:
assume ((~{.x, .y} & ~{.y, .z}) == ~{.x, .y, .z})
assume ((~{.x, .y} | ~{.y, .z}) == ~{.y})
assume ((~{.x, .y} ~ ~{.y, .z}) == {.x, .z})
test:
assume ((entries in {.x = 1}) == [{.key = "x", .value = 1}])
(entries in $dict) parses as
[: for ($k = $v) in $dict: add {.key = $k, .value = $v}]
test:
assume ((keys in {.x = 1}) == ["x"])
[keys in $dict, keys of $dict] all parse as [: for ($k = $v) in $dict: add $k]
test:
assume ((values in {.x = 1}) == [1])
[values in $dict, values of $dict] all parse as
[: for ($k = $v) in $dict: add $v]
### Metatable stuff
test:
$t = {}
set $t's metatable to {.__tostring = ($ -> "XXX")}
assume ("\$t" == "XXX")
(set $dict's metatable to $metatable) compiles to
"setmetatable(\($dict as lua expr), \($metatable as lua expr));"
[$'s metatable, $'metatable] all compile to "getmetatable(\($ as lua expr))"
test:
assume (({} with fallback $ -> ($ + 1)).10 == 11)
($dict with fallback $key -> $value) compiles to ("
(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])
(sort $items) compiles to "table.sort(\($items as lua expr));"
[sort $items by $item = $key_expr, sort $items by $item -> $key_expr]
..all parse as
do:
$keys = ({} with fallback $item -> $key_expr)
lua> "table.sort(\$items, function(x,y) return \$keys[x] < \$keys[y] end)"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
external:
test:
assume ((sorted [3, 1, 2]) == [1, 2, 3])
[$items sorted, sorted $items] all mean:
$copy = [: for $ in $items: add $]
sort $copy
return $copy
[$items sorted by $item = $key, $items sorted by $item -> $key] all parse as
result of:
$copy = [: for $ in $items: add $]
sort $copy by $item = $key
return $copy
test:
assume ((unique [1, 2, 1, 3, 2, 3]) == [1, 2, 3])
(unique $items) means:
$unique = []
$seen = {}
for $ in $items:
unless $seen.$:
$unique, add $
$seen.$ = (yes)
return $unique
### Ranges:
test:
$r = (3 to 5)
assume ($r.2 == 4)
assume ($r is "a Range")
assume ((1 to 10, backwards) == (10 to 1 by -1))
assume (#(1 to 10 by 2) == 5)
$visited = []
for $ in (1 to 10 by 2):
$visited, add $
assume ($visited == [1, 3, 5, 7, 9])
$r = (1 to 10 by 2)
$visited = []
for $ in $r:
$visited, add $
assume ($visited == [1, 3, 5, 7, 9])
$range_mt = {
.__type = "a Range"
.__index =
for ($self's $key):
if ($key is "a Number"):
if (($key % 1) != 0):
return (nil)
$i = ($self.first + ($key - 1) * $self.step)
if ($self.step > 0):
if ($i > $self.last):
return (nil)
..else:
if ($i < $self.last):
return (nil)
return $i
return $range_mt.$key
.__len =
for $self:
$len = (($self.last - $self.first) / $self.step + 1)
if ($len < 0):
$len = 0
return ($len, rounded down)
.__eq =
for ($self == $other)
(($self's metatable) == ($other's metatable)) and
($self.first == $other.first) and
($self.last == $other.last) and ($self.step == $other.step)
.backwards = (for $self ($self.last to $self.first by -$self.step))
.__inext = $(inext), .__next = $(inext)
.as_text =
for $self:
if ($self.step == 1):
return "(\($self.first) to \($self.last))"
..else:
return "(\($self.first) to \($self.last) by \($self.step))"
}
$range_mt.reversed = $range_mt.backwards
$range_mt.__unm = $range_mt.backwards
$range_mt.__tostring = $range_mt.as_text
$range_mt.as_nomsu = $range_mt.as_text
set $range_mt's metatable to (nil)
external:
($first to $last by $step) means
setmetatable {.first = $first, .last = $last, .step = $step} $range_mt
($first to $last) means
setmetatable {.first = $first, .last = $last, .step = 1} $range_mt
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