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// Copyright 2015-2016, The Gtk-rs Project Developers. // See the COPYRIGHT file at the top-level directory of this distribution. // Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT> //! `IMPL` The `glib_wrapper!` macro and miscellaneous wrapper traits. /// Defines a wrapper type and implements the appropriate traits. /// /// The basic syntax is /// /// ```ignore /// glib_wrapper! { /// /// Your documentation goes here /// pub struct $name($kind<$foreign>); /// /// match fn { /// $fn_name => /* a closure-like expression */, /// ... /// } /// } /// ``` /// /// This creates a wrapper named `$name` around the foreign type /// `$foreign` of `$kind` — one of [`Boxed`][#boxed], /// [`Shared`][#shared], or [`Object`][#object]. /// /// Inside the `match fn` block there are closure-like expressions to /// provide ways of copying/freeing, or referencing/unreferencing the /// value that you are wrapping. These expressions will be evaluated /// in an `unsafe` context, since they frequently invoke `extern` /// functions from an FFI crate. /// /// What follows is a description of each of the possible `$kind`: /// [`Boxed`][#boxed], [`Shared`][#shared], and [`Object`][#object]; /// note that each supports different sets of `$fn_name` inside the /// `match fn` block. Also, `Object` may require you to specify /// things like the class struct to wrap, plus any interfaces that the /// class implements. /// /// ### Boxed /// /// Boxed records with single ownership. /// /// With no registered `glib_ffi::GType`: /// /// ```ignore /// glib_wrapper! { /// /// Text buffer iterator /// pub struct TextIter(Boxed<ffi::GtkTextIter>); /// /// match fn { /// copy => |ptr| ffi::gtk_text_iter_copy(ptr), /// free => |ptr| ffi::gtk_text_iter_free(ptr), /// } /// } /// ``` /// /// `copy`: `|*const $foreign| -> *mut $foreign` creates a copy of the value. /// /// `free`: `|*mut $foreign|` frees the value. /// /// With a registered `glib_ffi::GType`: /// /// ```ignore /// glib_wrapper! { /// /// Text buffer iterator /// pub struct TextIter(Boxed<ffi::GtkTextIter>); /// /// match fn { /// copy => |ptr| ffi::gtk_text_iter_copy(ptr), /// free => |ptr| ffi::gtk_text_iter_free(ptr), /// get_type => || ffi::gtk_text_iter_get_type(), /// } /// } /// ``` /// /// `get_type`: `|| -> glib_ffi::GType` (optional) returns the /// `glib_ffi::GType` that corresponds to the foreign struct. /// /// ### Shared /// /// Records with reference-counted, shared ownership. /// /// With no registered `glib_ffi::GType`: /// /// ```ignore /// glib_wrapper! { /// /// Object holding timing information for a single frame. /// pub struct FrameTimings(Shared<ffi::GdkFrameTimings>); /// /// match fn { /// ref => |ptr| ffi::gdk_frame_timings_ref(ptr), /// unref => |ptr| ffi::gdk_frame_timings_unref(ptr), /// } /// } /// ``` /// /// `ref`: `|*mut $foreign|` increases the refcount. /// /// `unref`: `|*mut $foreign|` decreases the refcount. /// /// With a registered `glib_ffi::GType`: /// /// ```ignore /// glib_wrapper! { /// /// Object holding timing information for a single frame. /// pub struct FrameTimings(Shared<ffi::GdkFrameTimings>); /// /// match fn { /// ref => |ptr| ffi::gdk_frame_timings_ref(ptr), /// unref => |ptr| ffi::gdk_frame_timings_unref(ptr), /// get_type => || ffi::gdk_frame_timings_get_type(), /// } /// } /// ``` /// /// `get_type`: `|| -> glib_ffi::GType` (optional) returns the /// `glib_ffi::GType` that corresponds to the foreign struct. /// /// ### Object /// /// Objects -- classes. Note that the class name, if available, must be specified after the /// $foreign type; see below for [non-derivable classes][#non-derivable-classes]. /// /// The basic syntax is this: /// /// ```ignore /// glib_wrapper! { /// /// Your documentation goes here /// pub struct InstanceName(Object<ffi::InstanceStruct, ffi::ClassStruct, ClassName>) /// @extends ParentClass, GrandparentClass, ..., /// @implements Interface1, Interface2, ...; /// /// match fn { /// get_type => || ffi::instance_get_type(), /// } /// } /// ``` /// /// `get_type`: `|| -> glib_ffi::GType` returns the `glib_ffi::GType` /// that corresponds to the foreign class. /// /// #### All parent classes must be specified /// /// In the example above, "`@extends ParentClass, GrandparentClass, ...,`" is where you must /// specify all the parent classes of the one you are wrapping. The uppermost parent class, /// `glib::Object`, must not be specified. /// /// For example, `ffi::GtkWindowGroup` derives directly from /// `GObject`, so it can be simply wrapped as follows: /// /// ```ignore /// glib_wrapper! { /// pub struct WindowGroup(Object<ffi::GtkWindowGroup, ffi::GtkWindowGroupClass, WindowGroupClass>); /// /// match fn { /// get_type => || ffi::gtk_window_group_get_type(), /// } /// } /// ``` /// /// In contrast, `ffi::GtkButton` has a parent, grandparent, etc. classes, which must be specified: /// /// ```ignore /// glib_wrapper! { /// pub struct Button(Object<ffi::GtkButton, ButtonClass>) @extends Bin, Container, Widget; /// // see note on interfaces in the example below /// /// match fn { /// get_type => || ffi::gtk_button_get_type(), /// } /// } /// ``` /// /// #### Objects which implement interfaces /// /// The example above is incomplete, since `ffi::GtkButton` actually implements two interfaces, /// `Buildable` and `Actionable`. In this case, they must be specified after all the parent classes /// behind the `@implements` keyword: /// /// ```ignore /// glib_wrapper! { /// pub struct Button(Object<ffi::GtkButton, ButtonClass>) /// @extends Bin, Container, Widget, // parent classes /// @implements Buildable, Actionable; // interfaces /// /// match fn { /// get_type => || ffi::gtk_button_get_type(), /// } /// } /// ``` /// /// #### Non-derivable classes /// /// By convention, GObject implements "final" classes, i.e. those who /// cannot be subclassed, by *not* exposing a public Class struct. /// This way it is not possible to override any methods, as there are /// no `klass.method_name` fields to overwrite. In this case, don't /// specify a FFI class name at all in the `Object<>` part: /// /// ```ignore /// glib_wrapper! { /// pub struct Clipboard(Object<ffi::GtkClipboard, ClipboardClass>); /// ... /// } /// ``` /// /// #### Interfaces /// /// Interfaces are passed in the same way to the macro but instead of specifying /// `Object`, `Interface` has to be specified: /// /// ```ignore /// glib_wrapper! { /// pub struct TreeModel(Interface<ffi::GtkTreeModel, ffi::GtkTreeModelIface, TreeModelIface>); /// ... /// } /// ``` /// /// #### Interfaces with prerequisites /// /// Interfaces can declare prerequisites, i.e. the classes from which types that implement the /// interface have to inherit or interfaces that have to be implemented: /// /// ```ignore /// glib_wrapper! { /// pub struct TreeSortable(Interface<ffi::GtkTreeSortable, ffi::GtkTreeSortable, TreeSortableIface>) @requires TreeModel; /// ... /// } /// ``` /// /// [#boxed]: #boxed /// [#shared]: #shared /// [#object]: #object /// [#non-derivable-classes]: #non-derivable-classes #[macro_export] macro_rules! glib_wrapper { // Boxed ( $(#[$attr:meta])* pub struct $name:ident(Boxed<$ffi_name:path>); match fn { copy => |$copy_arg:ident| $copy_expr:expr, free => |$free_arg:ident| $free_expr:expr, } ) => { $crate::glib_boxed_wrapper!([$($attr)*] $name, $ffi_name, @copy $copy_arg $copy_expr, @free $free_arg $free_expr); }; ( $(#[$attr:meta])* pub struct $name:ident(Boxed<$ffi_name:path>); match fn { copy => |$copy_arg:ident| $copy_expr:expr, free => |$free_arg:ident| $free_expr:expr, get_type => || $get_type_expr:expr, } ) => { $crate::glib_boxed_wrapper!([$($attr)*] $name, $ffi_name, @copy $copy_arg $copy_expr, @free $free_arg $free_expr, @get_type $get_type_expr); }; ( $(#[$attr:meta])* pub struct $name:ident(Boxed<$ffi_name:path>); match fn { copy => |$copy_arg:ident| $copy_expr:expr, free => |$free_arg:ident| $free_expr:expr, init => |$init_arg:ident| $init_expr:expr, clear => |$clear_arg:ident| $clear_expr:expr, } ) => { $crate::glib_boxed_wrapper!([$($attr)*] $name, $ffi_name, @copy $copy_arg $copy_expr, @free $free_arg $free_expr, @init $init_arg $init_expr, @clear $clear_arg $clear_expr); }; ( $(#[$attr:meta])* pub struct $name:ident(Boxed<$ffi_name:path>); match fn { copy => |$copy_arg:ident| $copy_expr:expr, free => |$free_arg:ident| $free_expr:expr, init => |$init_arg:ident| $init_expr:expr, clear => |$clear_arg:ident| $clear_expr:expr, get_type => || $get_type_expr:expr, } ) => { $crate::glib_boxed_wrapper!([$($attr)*] $name, $ffi_name, @copy $copy_arg $copy_expr, @free $free_arg $free_expr, @init $init_arg $init_expr, @clear $clear_arg $clear_expr, @get_type $get_type_expr); }; // Shared ( $(#[$attr:meta])* pub struct $name:ident(Shared<$ffi_name:path>); match fn { ref => |$ref_arg:ident| $ref_expr:expr, unref => |$unref_arg:ident| $unref_expr:expr, } ) => { $crate::glib_shared_wrapper!([$($attr)*] $name, $ffi_name, @ref $ref_arg $ref_expr, @unref $unref_arg $unref_expr); }; ( $(#[$attr:meta])* pub struct $name:ident(Shared<$ffi_name:path>); match fn { ref => |$ref_arg:ident| $ref_expr:expr, unref => |$unref_arg:ident| $unref_expr:expr, get_type => || $get_type_expr:expr, } ) => { $crate::glib_shared_wrapper!([$($attr)*] $name, $ffi_name, @ref $ref_arg $ref_expr, @unref $unref_arg $unref_expr, @get_type $get_type_expr); }; // Object, no class struct, no parents or interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $rust_class_name:ident>); match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $crate::wrapper::Void, $rust_class_name, @get_type $get_type_expr, @extends [], @implements []); }; // Object, class struct, no parents or interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $ffi_class_name:path, $rust_class_name:ident>); match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $ffi_class_name, $rust_class_name, @get_type $get_type_expr, @extends [], @implements []); }; // Object, no class struct, parents, no interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $rust_class_name:ident>) @extends $($extends:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $crate::wrapper::Void, $rust_class_name, @get_type $get_type_expr, @extends [$($extends),+], @implements []); }; // Object, class struct, parents, no interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $ffi_class_name:path, $rust_class_name:ident>) @extends $($extends:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $ffi_class_name, $rust_class_name, @get_type $get_type_expr, @extends [$($extends),+], @implements []); }; // Object, no class struct, no parents, interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $rust_class_name:ident>) @implements $($implements:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $crate::wrapper::Void, $rust_class_name, @get_type $get_type_expr, @extends [], @implements [$($implements),+]); }; // Object, class struct, no parents, interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $ffi_class_name:path, $rust_class_name:ident>) @implements $($implements:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $ffi_class_name, $rust_class_name, @get_type $get_type_expr, @extends [], @implements [$($implements),+]); }; // Object, no class struct, parents and interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $rust_class_name:ident>) @extends $($extends:path),+, @implements $($implements:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $crate::wrapper::Void, $rust_class_name, @get_type $get_type_expr, @extends [$($extends),+], @implements [$($implements),+]); }; // Object, class struct, parents and interfaces ( $(#[$attr:meta])* pub struct $name:ident(Object<$ffi_name:path, $ffi_class_name:path, $rust_class_name:ident>) @extends $($extends:path),+, @implements $($implements:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@object [$($attr)*] $name, $ffi_name, $ffi_class_name, $rust_class_name, @get_type $get_type_expr, @extends [$($extends),+], @implements [$($implements),+]); }; // Interface, no prerequisites ( $(#[$attr:meta])* pub struct $name:ident(Interface<$ffi_name:path>); match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@interface [$($attr)*] $name, $ffi_name, @get_type $get_type_expr, @requires []); }; // Interface, prerequisites ( $(#[$attr:meta])* pub struct $name:ident(Interface<$ffi_name:path>) @requires $($requires:path),+; match fn { get_type => || $get_type_expr:expr, } ) => { $crate::glib_object_wrapper!(@interface [$($attr)*] $name, $ffi_name, @get_type $get_type_expr, @requires [$($requires),+]); }; } // So we can refer to the empty type by a path pub type Void = ();