mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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339 lines
9.4 KiB
Plaintext
339 lines
9.4 KiB
Plaintext
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The overall syntax is:
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(type-of-thing-being-defined name-used-to-refer-to-this-thing
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(attribute-name attribute-value-depending-on-the-attribute)
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(attribute-name attribute-value-depending-on-the-attribute)
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(attribute-name attribute-value-depending-on-the-attribute))
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Some definitions can have a c-declaration field that gives the C code
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we parsed to arrive at the definition. The c-declaration is a quoted
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string because it can contain parentheses and such.
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Defined types and their attributes:
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===
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(module module-name
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(submodule-of module-name)) ;; submodule is optional
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Ex: (module Gtk)
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Ex: (module Rgb
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(submodule-of Gdk))
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modules are later referred to with a list of module names, like
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(Gdk Rgb) or (Gtk)
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Object and boxed type definitions automatically create a submodule.
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For example, GtkCList creates the module (module CList (submodule-of
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(Gtk))) which is referred to as module (Gtk CList).
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===
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(type
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(alias some-unique-identifier)
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(in-module module-name) ;; optional, gchar* is not in a module
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(gtk-type-id gtk-type-system-id) ;; optional, absent if this is not
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;; in the type system
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(is-parametric boolean) ;; optional default to #f
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(in-c-name name-of-symbol-in-C)
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(out-c-name name-of-symbol-in-C)
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(inout-c-name name-of-symbol-in-C))
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Ex: (type
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(alias string)
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(gtk-type-id GTK_TYPE_STRING)
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(in-c-name "const gchar*")
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(out-c-name "gchar**") ;; actually I'm not sure how strings work out/inout
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(inout-c-name "gchar*"))
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(type
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(alias list)
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(gtk-type-id GTK_TYPE_POINTER)
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(is-parametric #t)
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(in-c-name "GList*")
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(out-c-name "GList**")
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(inout-c-name "GList**"))
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;; This one would be implied by the (object) def for GtkWidget I
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;; think - (type) is only required for types that are not implied
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;; by other definitions, such as int/boolean/etc.
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(type
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(alias GtkWidget)
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(in-module (Gtk))
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(gtk-type-id GTK_TYPE_WIDGET)
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(in-c-name "GtkWidget*")
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(inout-c-name "GtkWidget*")
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(out-c-name "GtkWidget**"))
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"Type" bindings are automatically assumed for objects, boxed types,
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etc. as defined below.
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The alias field is used to refer to the type later on.
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Whenever a type alias can be used, it is also possible to use the
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keyword "native", which implies that the type in question is too
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C-specific to represent. Then a c-declaration will typically be
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available for use.
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C types containing [] or () are function pointers or arrays. For
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arrays that don't specify a size, we just treat them as pointers. For
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function pointers, we need special (type) syntax/attributes of some
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kind, but since there basically aren't any of these right now in the
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libs we care about we can just ignore them. For arrays that specify a
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size ditto, you would handle them by adding an (array-size) attribute
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or something or using the "native" keyword and skipping the (type)
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stuff.
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===
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(object object-name
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(in-module module-name-list)
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(parent object-name optional-module-name-if-different)
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(abstract boolean-is-abstract-class) ;; omit for default of #f
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(c-name name-of-the-object-in-C)
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(field (type-and-name type-alias-of-struct-field name-of-struct-field)
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(access read-or-write-or-readwrite)))
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Ex: (object Widget
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(in-module (Gtk))
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(parent Object) ;; could say (parent Object (Gtk))
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(abstract #t)
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(c-name GtkWidget)
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(field (type-and-name GdkWindow* window) (access read)))
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An "object" declaration automatically implies the type definition:
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(type
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(alias concat-module-elements-and-object-name)
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(in-c-name pointer-to-c-name)
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(out-c-name pointer-to-pointer-to-c-name)
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(inout-c-name pointer-to-c-name))
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Ex:
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(type (alias GtkWidget)
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(in-c-name GtkWidget*)
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(out-c-name GtkWidget**)
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(inout-c-name GtkWidget*))
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It also implies a module that is the name broken into parts:
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(module CTree
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(submodule-of Gtk))
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===
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(function function-name
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(in-module module-name-list) ;; "static methods" go in their
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;; object's module
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(is-constructor-of object-type-alias) ;; optional, marks a constructor
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(c-name function-name)
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(return-type return-value-type) ;; defaults to void
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(caller-owns-return boolean-value) ;; defaults to #f
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(can-return-null boolean-value) ;; defaults to #t
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(parameter in-or-out-or-inout
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(type-and-name parameter-type-alias parameter-name)
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(type-parameter name-of-contained-type) ;; optional, requires parametric type
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(c-declaration "c-type-and-name")) ;; c-declaration only required
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;; if the type alias is "native"
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(varargs #t) ;; has varargs at the end
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)
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Ex:
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(function init
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(in-module (Gdk Rgb)
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(c-name gdk_rgb_init)))
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Ex:
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(function new
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(in-module (Gdk Rgb Cmap))
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(is-constructor-of GdkRgbCmap)
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(c-name gdk_rgb_cmap_new)
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(return-type GdkRgbCmap)
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(caller-owns-return #t) ;; perhaps this could be implied by is-constructor-of
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(parameter in (type-and-name array-of-guint32 colors))
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(parameter in (type-and-name gint n_colors)))
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Ex:
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(function config_set_set_handler
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(in-module (Gnome))
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(c-name gnome_config_set_set_handler)
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(parameter in (type-and-name native func)
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(c-declaration "void (*func)(void*)"))
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(parameter in (type-and-name gpointer data)))
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===
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(method method-name
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(of-object object-name module-name)
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;; retval/arg attributes as for (function), but with first parameter
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;; omitted for non-constructors
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)
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Ex:
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(method set_text
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(of-object Label (Gtk))
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(parameter (type-and-name const-gchar* str)))
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===
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(object-argument arg-name
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(of-object object-we-are-an-argument-of optional-objects-module)
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(type-id argument-type) ;; GTK_TYPE_OBJECT etc.
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;; flags all default to #f
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(readable bool-value)
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(writeable bool-value)
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(construct-only bool-value))
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Ex:
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(object-argument label
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(of-object Label (Gtk))
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(type GTK_TYPE_STRING)
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(readable #t)
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(writeable #t))
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===
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(signal signal-name
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(run-action bool-value)
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(run-first bool-value)
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(run-last bool-value)
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(of-object object-we-are-a-signal-of optional-objects-module)
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;; return value and parameters as for a function, omitting the object
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;; and user data parameters
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;; what other properties matter for a signal?
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)
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Ex:
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(signal select_row
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(of-object CList (Gtk))
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(run-first #t)
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;; return type defaults to void
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(parameter in (type-and-name gint row))
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(parameter in (type-and-name gint column))
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(parameter in (type-and-name GdkEvent* event)))
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===
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(enum enum-name
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(in-module modname)
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(c-name name-in-c)
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(value (nick value-name-noprefixes-hyphen-lowercase) (c-name value-c-name)))
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Ex:
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(enum DirectionType
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(in-module Gtk)
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(c-name GtkDirectionType)
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(value (nick tab-forward) (c-name GTK_DIR_TAB_FORWARD))
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(value (nick tab-backward) (c-name GTK_DIR_TAB_BACKWARD))
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(value (nick up) (c-name GTK_DIR_UP))
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(value (nick down) (c-name GTK_DIR_DOWN))
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(value (nick left) (c-name GTK_DIR_LEFT))
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(value (nick right) (c-name GTK_DIR_RIGHT)))
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(enum Pos
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(in-module (Gtk CTree))
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(c-name GtkCTreePos)
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(value (nick before) (c-name GTK_CTREE_POS_BEFORE))
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(value (nick as-child) (c-name GTK_CTREE_POS_AS_CHILD))
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(value (nick after) (c-name GTK_CTREE_POS_AFTER)))
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===
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(flags) is just like enum, but some bindings may wrap enums and flags differently.
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===
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(boxed boxed-name
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(in-module modname)
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(c-name c-name)
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(ref-func func-to-increase-refcount)
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(copy-func func-to-copy)
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(release-func func-to-destroy-or-decrement-refcount)
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(field (type-and-name type-alias-of-struct-field name-of-struct-field) (access access-rule)))
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It is never OK to use memcpy() to copy a boxed type, or use
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malloc()/free() to alloc/free one.
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Ex:
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(boxed Pixmap
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(in-module (Gdk))
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(c-name GdkPixmap)
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(ref-func pixmap_ref)
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(release-func pixmap_unref))
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An "object" declaration automatically implies the type definition:
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(type
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(alias concat-module-elements-and-boxed-name)
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(in-c-name pointer-to-c-name)
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(out-c-name pointer-to-pointer-to-c-name)
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(inout-c-name pointer-to-c-name))
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Ex:
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(type (alias GdkPixmap)
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(in-c-name GdkPixmap*)
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(out-c-name GdkPixmap**)
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(inout-c-name GdkPixmap*))
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===
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(struct struct-name
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(in-module modname)
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(c-name c-name)
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(field (type-and-name type-alias-of-struct-field name-of-struct-field) (access access-rule)))
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Unlike a boxed type, a struct type can be copied with memcpy() and
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allocated on the stack or with g_malloc().
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Ex:
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(struct Rectangle
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(in-module (Gdk))
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(c-name GdkRectangle)
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(field (type-and-name gint16 x) (access readwrite))
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(field (type-and-name gint16 y) (access readwrite))
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(field (type-and-name guint16 width) (access readwrite))
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(field (type-and-name guint16 height) (access readwrite)))
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Implies GdkRectangle type alias:
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(type (alias GdkRectangle)
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(in-c-name GdkRectangle*)
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(out-c-name GdkRectangle*) ;; note - not the same as boxed types
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(inout-c-name GdkRectangle*))
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===
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(user-function name
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(in-module module)
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(c-name c-typedef-name)
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;; return-type and parameters as for (function)
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)
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Ex:
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(user-function PrintFunc
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(in-module (Gtk))
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(parameter in (type-and-name gpointer func_data))
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(parameter in (type-and-name gchar* str)))
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===
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(typedef new-name
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(in-module module)
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(c-name c-full-name)
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(orig-type alias-of-orig-type))
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Ex:
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(typedef Type
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(in-module (Gtk))
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(c-name GtkType)
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(orig-type guint))
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