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#!/usr/bin/env nomsu -V6.14
#
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 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 ((size of $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 (size of $dict) == 3
assume [: for $k = $v in {.x = 1}: add {.key = $k, .value = $v}] ==
[{.key = "x", .value = 1}]
assume ({.x = 1, .y = 1} + {.y = 10, .z = 10}) == {.x = 1, .y = 11, .z = 10}
assume ({.x = 1, .y = 1} | {.y = 10, .z = 10}) == {.x = 1, .y = 1, .z = 10}
assume ({.x = 1, .y = 1} & {.y = 10, .z = 10}) == {.y = 1}
assume ({.x = 1, .y = 1} ~ {.y = 10, .z = 10}) == {.x = 1, .z = 10}
test:
assume (([[1, 2], [3, 4]] flattened) == [1, 2, 3, 4])
externally ($lists flattened) means:
$flat = []
for $item in recursive $lists:
if ($item is a "List"):
for $ in $item:
recurse $item on $
..else:
$flat, add $item
return $flat
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 -> $key_expr)
lua> "table.sort(\$items, function(x,y) return \$keys[x] < \$keys[y] end)"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test:
assume ((sorted [3, 1, 2]) == [1, 2, 3])
externally [$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])
externally (unique $items) means:
$unique = []
$seen = {}
for $ in $items:
unless $seen.$:
$unique, add $
$seen.$ = (yes)
return $unique
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