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#..
This file contains code that supports manipulating and using collections like lists
and dictionaries.
use "lib/metaprogramming.nom"
use "lib/control_flow.nom"
use "lib/operators.nom"
# List/dict functions:
# Indexing
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 {expr:"utils.nth_to_last(\(%list as lua expr), \(%index as lua expr))"}
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
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)
# Note: it's important to have the space after "[" to prevent confusion if %index is a string
compile [%list has key %index, %list has index %index] to {..}
expr: ".."
((\(%list as lua expr))[ \(%index as lua expr)] ~= nil)
# Note: it's important to have the space after "[" to prevent confusion if %index is a string
compile [..]
%list doesn't have key %index, %list does not have key %index
%list doesn't have index %index, %list does not have index %index
..to {expr:"((\(%list as lua expr))[ \(%index as lua expr)] ~= nil)"}
compile [length of %list, size of %list, size %list, number of %list, len %list] to
{expr:"utils.size(\(%list as lua expr))"}
compile [append %item to %list, add %item to %list] to
{statements:"table.insert(\(%list as lua expr), \(%item as lua expr))"}
compile [pop from %list, remove last from %list] to
{statements:"table.remove(\(%list as lua expr))"}
compile [remove index %index from %list] to
{statements:"table.remove(\(%list as lua expr), \(%index as lua expr))"}
action [flatten %lists]
%flat <- []
for %list in %lists
for %item in %list
add %item to %flat
return %flat
action [entries in %dict]
[{key:%k, value:%v} for %k=%v in %dict]
action [keys in %dict]
[%k for %k=%v in %dict]
action [values in %dict]
[%v for %k=%v in %dict]
# List Comprehension
immediately
compile [%expression for %item in %iterable] to
assume ((%item's "type") is "Var") or barf ".."
List comprehension has the wrong type for the loop variable. Expected Var, but got: \(%item's "type")
return {..}
expr:".."
(function()
local comprehension = {};
for i,\(%item as lua expr) in ipairs(\(%iterable as lua expr)) do
comprehension[i] = \(%expression as lua expr);
end
return comprehension;
end)()
parse [%expression for all %iterable] as: %expression for % in %iterable
compile [%expression for %key = %value in %iterable] to
assume ((%key's "type") is "Var") or barf ".."
List comprehension has the wrong type for the key loop variable. Expected Var, but got: \(%key's "type")
assume ((%value's "type") is "Var") or barf ".."
List comprehension has the wrong type for the value loop variable. Expected Var, but got: \(%value's "type")
return {..}
expr: ".."
(function()
local comprehension = {};
for \(%key as lua expr), \(%value as lua expr) in pairs(\(%iterable as lua expr)) do
comprehension[i] = \(%expression as lua expr)
end
return comprehension;
end)()
# Dict comprehensions
immediately
compile [%key = %value for %item in %iterable] to
assume ((%item's "type") is "Var") or barf ".."
Dict comprehension has the wrong type for the loop variable. Expected Var, but got: \(%item's "type")
# Note: it's important to have the space after "[" to prevent confusion if %key is a string
return {..}
expr: ".."
(function()
local comprehension = {};
for i,\(%item as lua expr) in ipairs(\(%iterable as lua expr)) do
comprehension[ \(%key as lua expr)] = \(%value as lua expr)
end
return comprehension;
end)()
parse [%key = %value for all %iterable] as: %key = %value for % in %iterable
compile [%key = %value for %src_key = %src_value in %iterable] to
assume ((%src_key's "type") is "Var") or barf ".."
Dict comprehension has the wrong type for the key loop variable. Expected Var, but got: \(%src_key's "type")
assume ((%src_value's "type") is "Var") or barf ".."
Dict comprehension has the wrong type for the value loop variable. Expected Var, but got: \(%src_value's "type")
# Note: it's important to have the space after "[" to prevent confusion if %key is a string
return {..}
expr: ".."
(function()
local comprehension = {};
for \(%src_key as lua expr), \(%src_value as lua expr) in pairs(\(%iterable as lua expr)) do
comprehension[ \(%key as lua expr)] = \(%value as lua expr);
end
return comprehension;
end)()
# Sorting:
compile [sort %items] to {statements:"table.sort(\(%items as lua expr))"}
compile [sort %items by %key_expr] to {..}
statements: ".."
utils.sort(\(%items as lua expr), function(\(\% as lua expr))
return \(%key_expr as lua expr);
end)
action [%items sorted]
%copy <- (% for all %items)
sort %copy
return %copy
action [%items sorted by %key]
%copy <- (% for all %items)
sort %copy by %key
return %copy
action [unique %items]
[%k for %k=%v in (%=(yes) for all %items)]
# Metatable stuff
compile [set %dict's metatable to %metatable] to {..}
statements: "setmetatable(\(%dict as lua expr), \(%metatable as lua expr));"
compile [new counter] to {expr:"setmetatable({}, {__index=function() return 0; end})"}
compile [new default dict] to {..}
expr: ".."
setmetatable({}, {__index=function(self, key)
t = {};
self[key] = t;
return t;
end})
# TODO: maybe make a generator/coroutine?
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