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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
#pragma once
#include <config.h>
#include <stdint.h>
#include <cstddef> // for nullptr_t
#include <sstream> // for ostringstream
#include <string> // for string
#include <type_traits>
#include <utility> // for move, swap
#include <vector> // for vector
#include <glib-object.h>
#include <glib.h> // for FALSE, g_clear_pointer, g_free, g_variant_...
// IWYU pragma: no_forward_declare _GHashTable
#include <js/TypeDecls.h>
#include "gi/arg-types-inl.h"
#include "gi/utils-inl.h"
#include "gjs/auto.h"
#include "gjs/macros.h"
namespace Gjs {
struct AutoGValue : GValue {
AutoGValue() : GValue(G_VALUE_INIT) {
static_assert(sizeof(AutoGValue) == sizeof(GValue));
}
explicit AutoGValue(GType gtype) : AutoGValue() {
g_value_init(this, gtype);
}
AutoGValue(AutoGValue const& src) : AutoGValue(G_VALUE_TYPE(&src)) {
g_value_copy(&src, this);
}
AutoGValue& operator=(AutoGValue other) {
// We need to cast to GValue here not to make swap to recurse here
std::swap(*static_cast<GValue*>(this), *static_cast<GValue*>(&other));
return *this;
}
AutoGValue(AutoGValue&& src) {
switch (G_VALUE_TYPE(&src)) {
case G_TYPE_NONE:
case G_TYPE_CHAR:
case G_TYPE_UCHAR:
case G_TYPE_BOOLEAN:
case G_TYPE_INT:
case G_TYPE_UINT:
case G_TYPE_LONG:
case G_TYPE_ULONG:
case G_TYPE_INT64:
case G_TYPE_UINT64:
case G_TYPE_FLOAT:
case G_TYPE_DOUBLE:
*static_cast<GValue*>(this) =
std::move(static_cast<GValue const&&>(src));
break;
default:
// We can't safely move in complex cases, so let's just copy
this->steal();
*this = src;
g_value_unset(&src);
}
}
void steal() { *static_cast<GValue*>(this) = G_VALUE_INIT; }
~AutoGValue() { g_value_unset(this); }
};
/* This is based on what GMarshalling does, it is an unsupported API but GJS can
* be considered a GLib implementation for JS, so it is fine to do this, but we
* need to be in sync with gmarshal.c in GLib.
* https://gitlab.gnome.org/GNOME/glib/-/blob/main/gobject/gmarshal.c
*/
template <typename TAG>
inline constexpr Tag::RealT<TAG> gvalue_get(const GValue* gvalue) {
if constexpr (std::is_same_v<TAG, Tag::GBoolean>)
return gvalue->data[0].v_int != FALSE;
else if constexpr (std::is_same_v<TAG, bool>)
return gvalue->data[0].v_int != FALSE;
else if constexpr (std::is_same_v<TAG, char>)
return gvalue->data[0].v_int;
else if constexpr (std::is_same_v<TAG, signed char>)
return gvalue->data[0].v_int;
else if constexpr (std::is_same_v<TAG, unsigned char>)
return gvalue->data[0].v_uint;
else if constexpr (std::is_same_v<TAG, int>)
return gvalue->data[0].v_int;
else if constexpr (std::is_same_v<TAG, unsigned>)
return gvalue->data[0].v_uint;
else if constexpr (std::is_same_v<TAG, Tag::Long>)
return gvalue->data[0].v_long;
else if constexpr (std::is_same_v<TAG, Tag::UnsignedLong>)
return gvalue->data[0].v_ulong;
else if constexpr (std::is_same_v<TAG, int64_t>)
return gvalue->data[0].v_int64;
else if constexpr (std::is_same_v<TAG, uint64_t>)
return gvalue->data[0].v_uint64;
else if constexpr (std::is_same_v<TAG, Tag::Enum>)
return gvalue->data[0].v_long;
else if constexpr (std::is_same_v<TAG, Tag::UnsignedEnum>)
return gvalue->data[0].v_ulong;
else if constexpr (std::is_same_v<TAG, float>)
return gvalue->data[0].v_float;
else if constexpr (std::is_same_v<TAG, double>)
return gvalue->data[0].v_double;
else if constexpr (std::is_same_v<TAG, Tag::GType>)
return gjs_pointer_to_int<GType>(gvalue->data[0].v_pointer);
else if constexpr (!std::is_pointer_v<TAG>)
static_assert(std::is_pointer_v<TAG>,
"Scalar type not properly handled");
else
return static_cast<TAG>(gvalue->data[0].v_pointer);
}
template <typename TAG>
void gvalue_set(GValue* gvalue, Tag::RealT<TAG> value) {
if constexpr (std::is_same_v<TAG, Tag::GBoolean>)
gvalue->data[0].v_int = value != FALSE;
else if constexpr (std::is_same_v<TAG, bool>)
gvalue->data[0].v_int = value != false;
else if constexpr (std::is_same_v<TAG, char>)
gvalue->data[0].v_int = value;
else if constexpr (std::is_same_v<TAG, signed char>)
gvalue->data[0].v_int = value;
else if constexpr (std::is_same_v<TAG, unsigned char>)
gvalue->data[0].v_uint = value;
else if constexpr (std::is_same_v<TAG, int>)
gvalue->data[0].v_int = value;
else if constexpr (std::is_same_v<TAG, unsigned>)
gvalue->data[0].v_uint = value;
else if constexpr (std::is_same_v<TAG, Tag::Long>)
gvalue->data[0].v_long = value;
else if constexpr (std::is_same_v<TAG, Tag::UnsignedLong>)
gvalue->data[0].v_ulong = value;
else if constexpr (std::is_same_v<TAG, int64_t>)
gvalue->data[0].v_int64 = value;
else if constexpr (std::is_same_v<TAG, uint64_t>)
gvalue->data[0].v_uint64 = value;
else if constexpr (std::is_same_v<TAG, Tag::Enum>)
gvalue->data[0].v_long = value;
else if constexpr (std::is_same_v<TAG, Tag::UnsignedEnum>)
gvalue->data[0].v_ulong = value;
else if constexpr (std::is_same_v<TAG, float>)
gvalue->data[0].v_float = value;
else if constexpr (std::is_same_v<TAG, double>)
gvalue->data[0].v_double = value;
else if constexpr (std::is_same_v<TAG, Tag::GType>)
gvalue->data[0].v_pointer = gjs_int_to_pointer(value);
else
static_assert(!std::is_scalar_v<Tag::RealT<TAG>>,
"Scalar type not properly handled");
}
// Specialization for types where TAG and RealT<TAG> are the same type, to allow
// inferring template parameter
template <typename T,
typename = std::enable_if_t<std::is_same_v<Gjs::Tag::RealT<T>, T>>>
inline void gvalue_set(GValue* gvalue, T value) {
gvalue_set<T>(gvalue, value);
}
template <typename T>
void gvalue_set(GValue* gvalue, T* value) = delete;
template <>
inline void gvalue_set(GValue* gvalue, char* value) {
g_clear_pointer(&gvalue->data[0].v_pointer, g_free);
gvalue->data[0].v_pointer = g_strdup(value);
}
template <>
inline void gvalue_set(GValue* gvalue, GObject* value) {
g_set_object(&gvalue->data[0].v_pointer, value);
}
template <>
inline void gvalue_set(GValue* gvalue, GVariant* value) {
g_clear_pointer(reinterpret_cast<GVariant**>(&gvalue->data[0].v_pointer),
g_variant_unref);
gvalue->data[0].v_pointer = value ? g_variant_ref(value) : nullptr;
}
template <typename T>
void gvalue_set(GValue* gvalue, std::nullptr_t) {
if constexpr (std::is_same_v<T, char*>) {
g_clear_pointer(&gvalue->data[0].v_pointer, g_free);
} else if constexpr (std::is_same_v<T, GObject*>) {
g_set_object(&gvalue->data[0].v_pointer, nullptr);
} else if constexpr (std::is_same_v<T, GVariant*>) {
g_clear_pointer(reinterpret_cast<T*>(&gvalue->data[0].v_pointer),
g_variant_unref);
gvalue->data[0].v_pointer = nullptr;
} else {
static_assert(!std::is_pointer_v<T>, "Not a known pointer type");
}
}
template <typename TAG>
void gvalue_take(GValue* gvalue, Tag::RealT<TAG> value) {
using T = Tag::RealT<TAG>;
if constexpr (!std::is_pointer_v<T>) {
return gvalue_set<TAG>(gvalue, value);
}
if constexpr (std::is_same_v<T, char*>) {
g_clear_pointer(&gvalue->data[0].v_pointer, g_free);
gvalue->data[0].v_pointer = g_steal_pointer(&value);
} else if constexpr (std::is_same_v<T, GObject*>) {
g_clear_object(&gvalue->data[0].v_pointer);
gvalue->data[0].v_pointer = g_steal_pointer(&value);
} else if constexpr (std::is_same_v<T, GVariant*>) {
g_clear_pointer(reinterpret_cast<T*>(&gvalue->data[0].v_pointer),
g_variant_unref);
gvalue->data[0].v_pointer = value;
} else {
static_assert(!std::is_pointer_v<T>, "Not a known pointer type");
}
}
template <typename TAG>
std::string gvalue_to_string(GValue* gvalue) {
using std::string_literals::operator""s;
std::string str{"GValue of type "s + G_VALUE_TYPE_NAME(gvalue) + ": "};
if constexpr (std::is_same_v<TAG, char*>) {
str += "\""s + Gjs::gvalue_get<TAG>(gvalue) + '"';
} else if constexpr (std::is_same_v<TAG, GVariant*>) {
AutoChar variant{g_variant_print(Gjs::gvalue_get<TAG>(gvalue), true)};
str += "<"s + variant.get() + '>';
} else if constexpr (std::is_arithmetic_v<TAG>) {
str += std::to_string(Gjs::gvalue_get<TAG>(gvalue));
} else {
std::ostringstream out;
out << Gjs::gvalue_get<TAG>(gvalue);
str += out.str();
}
return str;
}
} // namespace Gjs
using AutoGValueVector = std::vector<Gjs::AutoGValue>;
GJS_JSAPI_RETURN_CONVENTION
bool gjs_value_to_g_value(JSContext*, JS::HandleValue, GValue*);
GJS_JSAPI_RETURN_CONVENTION
bool gjs_value_to_g_value_no_copy(JSContext*, JS::HandleValue, GValue*);
GJS_JSAPI_RETURN_CONVENTION
bool gjs_value_from_g_value(JSContext*, JS::MutableHandleValue, const GValue*);
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