mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-30 19:02:57 +00:00
351 lines
9.0 KiB
Nix
351 lines
9.0 KiB
Nix
/*
|
||
A partial and basic implementation of GVariant formatted strings.
|
||
See [GVariant Format Strings](https://docs.gtk.org/glib/gvariant-format-strings.html) for details.
|
||
|
||
:::{.warning}
|
||
This API is not considered fully stable and it might therefore
|
||
change in backwards incompatible ways without prior notice.
|
||
:::
|
||
*/
|
||
|
||
# This file is based on https://github.com/nix-community/home-manager
|
||
# Copyright (c) 2017-2022 Home Manager contributors
|
||
{ lib }:
|
||
|
||
let
|
||
inherit (lib)
|
||
concatMapStringsSep concatStrings escape head replaceStrings;
|
||
|
||
mkPrimitive = t: v: {
|
||
_type = "gvariant";
|
||
type = t;
|
||
value = v;
|
||
__toString = self: "@${self.type} ${toString self.value}"; # https://docs.gtk.org/glib/gvariant-text.html
|
||
};
|
||
|
||
type = {
|
||
arrayOf = t: "a${t}";
|
||
maybeOf = t: "m${t}";
|
||
tupleOf = ts: "(${concatStrings ts})";
|
||
dictionaryEntryOf = nameType: valueType: "{${nameType}${valueType}}";
|
||
string = "s";
|
||
boolean = "b";
|
||
uchar = "y";
|
||
int16 = "n";
|
||
uint16 = "q";
|
||
int32 = "i";
|
||
uint32 = "u";
|
||
int64 = "x";
|
||
uint64 = "t";
|
||
double = "d";
|
||
variant = "v";
|
||
};
|
||
|
||
/* Check if a value is a GVariant value
|
||
|
||
Type:
|
||
isGVariant :: Any -> Bool
|
||
*/
|
||
isGVariant = v: v._type or "" == "gvariant";
|
||
|
||
in
|
||
rec {
|
||
|
||
inherit type isGVariant;
|
||
|
||
intConstructors = [
|
||
{
|
||
name = "mkInt32";
|
||
type = type.int32;
|
||
min = -2147483648;
|
||
max = 2147483647;
|
||
}
|
||
{
|
||
name = "mkUint32";
|
||
type = type.uint32;
|
||
min = 0;
|
||
max = 4294967295;
|
||
}
|
||
{
|
||
name = "mkInt64";
|
||
type = type.int64;
|
||
# Nix does not support such large numbers.
|
||
min = null;
|
||
max = null;
|
||
}
|
||
{
|
||
name = "mkUint64";
|
||
type = type.uint64;
|
||
min = 0;
|
||
# Nix does not support such large numbers.
|
||
max = null;
|
||
}
|
||
{
|
||
name = "mkInt16";
|
||
type = type.int16;
|
||
min = -32768;
|
||
max = 32767;
|
||
}
|
||
{
|
||
name = "mkUint16";
|
||
type = type.uint16;
|
||
min = 0;
|
||
max = 65535;
|
||
}
|
||
{
|
||
name = "mkUchar";
|
||
type = type.uchar;
|
||
min = 0;
|
||
max = 255;
|
||
}
|
||
];
|
||
|
||
/* Returns the GVariant value that most closely matches the given Nix value.
|
||
If no GVariant value can be found unambiguously then error is thrown.
|
||
|
||
Type:
|
||
mkValue :: Any -> gvariant
|
||
*/
|
||
mkValue = v:
|
||
if builtins.isBool v then
|
||
mkBoolean v
|
||
else if builtins.isFloat v then
|
||
mkDouble v
|
||
else if builtins.isString v then
|
||
mkString v
|
||
else if builtins.isList v then
|
||
mkArray v
|
||
else if isGVariant v then
|
||
v
|
||
else if builtins.isInt v then
|
||
let
|
||
validConstructors = builtins.filter ({ min, max, ... }: (min == null || min <= v) && (max == null || v <= max)) intConstructors;
|
||
in
|
||
throw ''
|
||
The GVariant type for number “${builtins.toString v}” is unclear.
|
||
Please wrap the value with one of the following, depending on the value type in GSettings schema:
|
||
|
||
${lib.concatMapStringsSep "\n" ({ name, type, ...}: "- `lib.gvariant.${name}` for `${type}`") validConstructors}
|
||
''
|
||
else if builtins.isAttrs v then
|
||
throw "Cannot construct GVariant value from an attribute set. If you want to construct a dictionary, you will need to create an array containing items constructed with `lib.gvariant.mkDictionaryEntry`."
|
||
else
|
||
throw "The GVariant type of “${builtins.typeOf v}” can't be inferred.";
|
||
|
||
/* Returns the GVariant array from the given type of the elements and a Nix list.
|
||
|
||
Type:
|
||
mkArray :: [Any] -> gvariant
|
||
|
||
Example:
|
||
# Creating a string array
|
||
lib.gvariant.mkArray [ "a" "b" "c" ]
|
||
*/
|
||
mkArray = elems:
|
||
let
|
||
vs = map mkValue (lib.throwIf (elems == [ ]) "Please create empty array with mkEmptyArray." elems);
|
||
elemType = lib.throwIfNot (lib.all (t: (head vs).type == t) (map (v: v.type) vs))
|
||
"Elements in a list should have same type."
|
||
(head vs).type;
|
||
in
|
||
mkPrimitive (type.arrayOf elemType) vs // {
|
||
__toString = self:
|
||
"@${self.type} [${concatMapStringsSep "," toString self.value}]";
|
||
};
|
||
|
||
/* Returns the GVariant array from the given empty Nix list.
|
||
|
||
Type:
|
||
mkEmptyArray :: gvariant.type -> gvariant
|
||
|
||
Example:
|
||
# Creating an empty string array
|
||
lib.gvariant.mkEmptyArray (lib.gvariant.type.string)
|
||
*/
|
||
mkEmptyArray = elemType: mkPrimitive (type.arrayOf elemType) [ ] // {
|
||
__toString = self: "@${self.type} []";
|
||
};
|
||
|
||
|
||
/* Returns the GVariant variant from the given Nix value. Variants are containers
|
||
of different GVariant type.
|
||
|
||
Type:
|
||
mkVariant :: Any -> gvariant
|
||
|
||
Example:
|
||
lib.gvariant.mkArray [
|
||
(lib.gvariant.mkVariant "a string")
|
||
(lib.gvariant.mkVariant (lib.gvariant.mkInt32 1))
|
||
]
|
||
*/
|
||
mkVariant = elem:
|
||
let gvarElem = mkValue elem;
|
||
in mkPrimitive type.variant gvarElem // {
|
||
__toString = self: "<${toString self.value}>";
|
||
};
|
||
|
||
/* Returns the GVariant dictionary entry from the given key and value.
|
||
|
||
Type:
|
||
mkDictionaryEntry :: String -> Any -> gvariant
|
||
|
||
Example:
|
||
# A dictionary describing an Epiphany’s search provider
|
||
[
|
||
(lib.gvariant.mkDictionaryEntry "url" (lib.gvariant.mkVariant "https://duckduckgo.com/?q=%s&t=epiphany"))
|
||
(lib.gvariant.mkDictionaryEntry "bang" (lib.gvariant.mkVariant "!d"))
|
||
(lib.gvariant.mkDictionaryEntry "name" (lib.gvariant.mkVariant "DuckDuckGo"))
|
||
]
|
||
*/
|
||
mkDictionaryEntry =
|
||
# The key of the entry
|
||
name:
|
||
# The value of the entry
|
||
value:
|
||
let
|
||
name' = mkValue name;
|
||
value' = mkValue value;
|
||
dictionaryType = type.dictionaryEntryOf name'.type value'.type;
|
||
in
|
||
mkPrimitive dictionaryType { inherit name value; } // {
|
||
__toString = self: "@${self.type} {${name'},${value'}}";
|
||
};
|
||
|
||
/* Returns the GVariant maybe from the given element type.
|
||
|
||
Type:
|
||
mkMaybe :: gvariant.type -> Any -> gvariant
|
||
*/
|
||
mkMaybe = elemType: elem:
|
||
mkPrimitive (type.maybeOf elemType) elem // {
|
||
__toString = self:
|
||
if self.value == null then
|
||
"@${self.type} nothing"
|
||
else
|
||
"just ${toString self.value}";
|
||
};
|
||
|
||
/* Returns the GVariant nothing from the given element type.
|
||
|
||
Type:
|
||
mkNothing :: gvariant.type -> gvariant
|
||
*/
|
||
mkNothing = elemType: mkMaybe elemType null;
|
||
|
||
/* Returns the GVariant just from the given Nix value.
|
||
|
||
Type:
|
||
mkJust :: Any -> gvariant
|
||
*/
|
||
mkJust = elem: let gvarElem = mkValue elem; in mkMaybe gvarElem.type gvarElem;
|
||
|
||
/* Returns the GVariant tuple from the given Nix list.
|
||
|
||
Type:
|
||
mkTuple :: [Any] -> gvariant
|
||
*/
|
||
mkTuple = elems:
|
||
let
|
||
gvarElems = map mkValue elems;
|
||
tupleType = type.tupleOf (map (e: e.type) gvarElems);
|
||
in
|
||
mkPrimitive tupleType gvarElems // {
|
||
__toString = self:
|
||
"@${self.type} (${concatMapStringsSep "," toString self.value})";
|
||
};
|
||
|
||
/* Returns the GVariant boolean from the given Nix bool value.
|
||
|
||
Type:
|
||
mkBoolean :: Bool -> gvariant
|
||
*/
|
||
mkBoolean = v:
|
||
mkPrimitive type.boolean v // {
|
||
__toString = self: if self.value then "true" else "false";
|
||
};
|
||
|
||
/* Returns the GVariant string from the given Nix string value.
|
||
|
||
Type:
|
||
mkString :: String -> gvariant
|
||
*/
|
||
mkString = v:
|
||
let sanitize = s: replaceStrings [ "\n" ] [ "\\n" ] (escape [ "'" "\\" ] s);
|
||
in mkPrimitive type.string v // {
|
||
__toString = self: "'${sanitize self.value}'";
|
||
};
|
||
|
||
/* Returns the GVariant object path from the given Nix string value.
|
||
|
||
Type:
|
||
mkObjectpath :: String -> gvariant
|
||
*/
|
||
mkObjectpath = v:
|
||
mkPrimitive type.string v // {
|
||
__toString = self: "objectpath '${escape [ "'" ] self.value}'";
|
||
};
|
||
|
||
/* Returns the GVariant uchar from the given Nix int value.
|
||
|
||
Type:
|
||
mkUchar :: Int -> gvariant
|
||
*/
|
||
mkUchar = mkPrimitive type.uchar;
|
||
|
||
/* Returns the GVariant int16 from the given Nix int value.
|
||
|
||
Type:
|
||
mkInt16 :: Int -> gvariant
|
||
*/
|
||
mkInt16 = mkPrimitive type.int16;
|
||
|
||
/* Returns the GVariant uint16 from the given Nix int value.
|
||
|
||
Type:
|
||
mkUint16 :: Int -> gvariant
|
||
*/
|
||
mkUint16 = mkPrimitive type.uint16;
|
||
|
||
/* Returns the GVariant int32 from the given Nix int value.
|
||
|
||
Type:
|
||
mkInt32 :: Int -> gvariant
|
||
*/
|
||
mkInt32 = v:
|
||
mkPrimitive type.int32 v // {
|
||
__toString = self: toString self.value;
|
||
};
|
||
|
||
/* Returns the GVariant uint32 from the given Nix int value.
|
||
|
||
Type:
|
||
mkUint32 :: Int -> gvariant
|
||
*/
|
||
mkUint32 = mkPrimitive type.uint32;
|
||
|
||
/* Returns the GVariant int64 from the given Nix int value.
|
||
|
||
Type:
|
||
mkInt64 :: Int -> gvariant
|
||
*/
|
||
mkInt64 = mkPrimitive type.int64;
|
||
|
||
/* Returns the GVariant uint64 from the given Nix int value.
|
||
|
||
Type:
|
||
mkUint64 :: Int -> gvariant
|
||
*/
|
||
mkUint64 = mkPrimitive type.uint64;
|
||
|
||
/* Returns the GVariant double from the given Nix float value.
|
||
|
||
Type:
|
||
mkDouble :: Float -> gvariant
|
||
*/
|
||
mkDouble = v:
|
||
mkPrimitive type.double v // {
|
||
__toString = self: toString self.value;
|
||
};
|
||
}
|