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#
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
immediately
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))"
immediately
parse [first in %list, first %list] as: 1 st in %list
parse [last in %list, last %list] as: 1 st to last in %list
# Membership testing
immediately
action [%item is in %list, %list contains %item, %list has %item]
for %key = %value in %list
if (%key is %item): return (yes)
return (no)
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)
immediately
parse [%list has key %index, %list has index %index] as
%list.%index != (nil)
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))"
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 [pop from %list, remove last from %list] to
Lua "table.remove(\(%list as lua expr))"
compile [remove index %index from %list] to
Lua "table.remove(\(%list as lua expr), \(%index as lua expr))"
# List Comprehension
immediately
parse [%expression for %item in %iterable] as
result of
%comprehension <- []
for %i = %item in %iterable
%comprehension.%i <- %expression
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
parse [%expression for %var in %start to %stop] as
%expression for %var in %start to %stop via 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
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
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
immediately
action [%lists flattened]
%flat <- []
for %list in %lists
for %item in %list
add %item to %flat
return %flat
parse [entries in %dict] as: {key:%k, value:%v} for %k = %v in %dict
parse [keys in %dict, keys of %dict] as: %k for %k = %v in %dict
parse [values in %dict, values of %dict] as: %v for %k = %v in %dict
# Metatable stuff
immediately
compile [set %dict's metatable to %metatable] to
Lua "setmetatable(\(%dict as lua expr), \(%metatable as lua expr));"
compile [%dict with fallback %key -> %value] to
Lua value ".."
setmetatable(\(%dict as lua expr), {__index=function(self, \(%key as lua expr))
local value = \(%value as lua expr)
self[\(%key as lua expr)] = value
return value
end})
# Sorting
immediately
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)"
immediately
action [%items sorted, sorted %items]
%copy <- (% for % in %items)
sort %copy
return %copy
action [..]
%items sorted by %item = %key
%items sorted by %item -> %key
..
%copy <- (% for % in %items)
sort %copy by %item = %key
return %copy
action [unique %items]
%unique <- []
%seen <- {}
for % in %items
unless: % in %seen
add % to %unique
(% in %seen) <- (yes)
return %unique
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