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authorHasan Wan <hasan.wan@intel.com>2012-05-25 16:47:13 +0800
committerHasan Wan <hasan.wan@intel.com>2012-05-28 16:06:22 +0800
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+ ChangeLog for this draft:
+ - caller-owns-return attribute on functions/methods
+ - include gtk-type-id in the type alias system
+ - c-name for types converted to in-c-name out-c-name inout-c-name
+ - merge unref-func and destroy-func for boxed types into release-func
+
+ - split structs out of boxed types
+ - c-declaration field
+ - special "native" type alias; bail and use C declaration when
+ necessary
+ - defined objects and boxeds automatically create a module
+ - make constructors functions and not methods, in appropriate
+ object/boxed module
+
+ Draft =========================
+
+ The overall syntax is:
+
+ (type-of-thing-being-defined name-used-to-refer-to-this-thing
+ (attribute-name attribute-value-depending-on-the-attribute)
+ (attribute-name attribute-value-depending-on-the-attribute)
+ (attribute-name attribute-value-depending-on-the-attribute))
+
+ Some definitions can have a c-declaration field that gives the C code
+ we parsed to arrive at the definition. The c-declaration is a quoted
+ string because it can contain parentheses and such.
+
+ Defined types and their attributes:
+
+ ===
+ (module module-name
+ (submodule-of module-name)) ;; submodule is optional
+
+ Ex: (module Gtk)
+ Ex: (module Rgb
+ (submodule-of Gdk))
+
+ modules are later referred to with a list of module names, like
+ (Gdk Rgb) or (Gtk)
+
+ Object and boxed type definitions automatically create a submodule.
+ For example, GtkCList creates the module (module CList (submodule-of
+ (Gtk))) which is referred to as module (Gtk CList).
+
+ ===
+
+ (type
+ (alias some-unique-identifier)
+ (in-module module-name) ;; optional, gchar* is not in a module
+ (gtk-type-id gtk-type-system-id) ;; optional, absent if this is not
+ ;; in the type system
+ (in-c-name name-of-symbol-in-C)
+ (out-c-name name-of-symbol-in-C)
+ (inout-c-name name-of-symbol-in-C))
+
+ Ex: (type
+ (alias string)
+ (gtk-type-id GTK_TYPE_STRING)
+ (in-c-name const-gchar*)
+ (out-c-name gchar**) ;; actually I'm not sure how strings work
+ out/inout
+ (inout-c-name gchar*))
+
+ ;; This one would be implied by the (object) def for GtkWidget I
+ ;; think - (type) is only required for types that are not implied
+ ;; by other definitions, such as int/boolean/etc.
+
+ (type
+ (alias GtkWidget)
+ (in-module (Gtk))
+ (gtk-type-id GTK_TYPE_WIDGET)
+ (in-c-name GtkWidget*)
+ (inout-c-name GtkWidget*)
+ (out-c-name GtkWidget**))
+
+ "Type" bindings are automatically assumed for objects, boxed types,
+ etc. as defined below.
+
+ The alias field is used to refer to the type later on.
+
+ If the C type has spaces they are converted to hyphens after
+ compressing all syntactically significant whitespace to a single
+ space:
+ (type
+ (alias const-gchar*
+ (c-name const-gchar*)))
+
+ So hyphens have to go back to spaces for binding generators that
+ output C code.
+
+ Whenever a type alias can be used, it is also possible to use the
+ keyword "native", which implies that the type in question is too
+ C-specific to represent. Then a c-declaration will typically be
+ available for use.
+
+ C types containing [] or () are function pointers or arrays. For
+ arrays that don't specify a size, we just treat them as pointers. For
+ function pointers, we need special (type) syntax/attributes of some
+ kind, but since there basically aren't any of these right now in the
+ libs we care about we can just ignore them. For arrays that specify a
+ size ditto, you would handle them by adding an (array-size) attribute
+ or something or using the "native" keyword and skipping the (type)
+ stuff.
+
+ ===
+ (object object-name
+ (in-module module-name-list)
+ (parent object-name optional-module-name-if-different)
+ (abstract boolean-is-abstract-class) ;; omit for default of #f
+ (c-name name-of-the-object-in-C)
+ (field (type-and-name type-alias-of-struct-field
+ name-of-struct-field)
+ (access read-or-write-or-readwrite)))
+
+
+ Ex: (object Widget
+ (in-module (Gtk))
+ (parent Object) ;; could say (parent Object (Gtk))
+ (abstract #t)
+ (c-name GtkWidget)
+ (field (type-and-name GdkWindow* window) (access read)))
+
+ An "object" declaration automatically implies the type definition:
+
+ (type
+ (alias concat-module-elements-and-object-name)
+ (in-c-name pointer-to-c-name)
+ (out-c-name pointer-to-pointer-to-c-name)
+ (inout-c-name pointer-to-c-name))
+
+ Ex:
+ (type (alias GtkWidget)
+ (in-c-name GtkWidget*)
+ (out-c-name GtkWidget**)
+ (inout-c-name GtkWidget*))
+
+ It also implies a module that is the name broken into parts:
+ (module CTree
+ (submodule-of Gtk))
+
+ ===
+
+ (function function-name
+ (in-module module-name-list) ;; "static methods" go in their
+ ;; object's module
+ (is-constructor-of object-type-alias) ;; optional, marks a
+ constructor
+ (c-name function-name)
+ (return-type return-value-type) ;; defaults to void
+ (caller-owns-return boolean-value) ;; defaults to #f
+ (parameter in-or-out-or-inout
+ (type-and-name parameter-type-alias parameter-name)
+ (c-declaration "c-type-and-name")) ;; c-declaration only
+ required
+ ;; if the type alias is
+ "native"
+ (varargs #t) ;; has varargs at the end
+ )
+
+ Ex:
+ (function init
+ (in-module (Gdk Rgb)
+ (c-name gdk_rgb_init)))
+
+ Ex:
+ (function new
+ (in-module (Gdk Rgb Cmap))
+ (is-constructor-of GdkRgbCmap)
+ (c-name gdk_rgb_cmap_new)
+ (return-type GdkRgbCmap)
+ (caller-owns-return #t) ;; perhaps this could be implied by
+ is-constructor-of
+ (parameter in (type-and-name array-of-guint32 colors))
+ (parameter in (type-and-name gint n_colors)))
+
+ Ex:
+ (function config_set_set_handler
+ (in-module (Gnome))
+ (c-name gnome_config_set_set_handler)
+ (parameter in (type-and-name native func)
+ (c-declaration "void (*func)(void*)"))
+ (parameter in (type-and-name gpointer data)))
+
+ ===
+ (method method-name
+ (of-object object-name module-name)
+ ;; retval/arg attributes as for (function), but with first parameter
+
+ ;; omitted for non-constructors
+ )
+
+ Ex:
+ (method set_text
+ (of-object Label (Gtk))
+ (parameter (type-and-name const-gchar* str)))
+
+ ===
+ (object-argument arg-name
+ (of-object object-we-are-an-argument-of optional-objects-module)
+ (type argument-type) ;; not sure what to put for type
+ ;; flags all default to #f
+ (readable bool-value)
+ (writeable bool-value)
+ (run-action bool-value)
+ (construct-only bool-value))
+
+ Ex:
+ (object-argument label
+ (of-object Label (Gtk))
+ (type gchar*) ;; ????
+ (readable #t)
+ (writeable #t))
+
+ ===
+ (signal signal-name
+ (of-object object-we-are-a-signal-of optional-objects-module)
+ ;; return value and parameters as for a function, omitting the
+ object
+ ;; and user data parameters
+
+ ;; what other properties matter for a signal?
+ )
+
+ Ex:
+ (signal select_row
+ (of-object CList (Gtk))
+ ;; return type defaults to void
+ (parameter in (type-and-name gint row))
+ (parameter in (type-and-name gint column))
+ (parameter in (type-and-name GdkEvent* event)))
+
+ ===
+ (enum enum-name
+ (in-module modname)
+ (c-name name-in-c)
+ (value (name value-name-noprefixes-hyphen-lowercase) (c-name
+ value-c-name)))
+
+ Ex:
+
+ (enum DirectionType
+ (in-module Gtk)
+ (c-name GtkDirectionType)
+ (value (name tab-forward) (c-name GTK_DIR_TAB_FORWARD))
+ (value (name tab-backward) (c-name GTK_DIR_TAB_BACKWARD))
+ (value (name up) (c-name GTK_DIR_UP))
+ (value (name down) (c-name GTK_DIR_DOWN))
+ (value (name left) (c-name GTK_DIR_LEFT))
+ (value (name right) (c-name GTK_DIR_RIGHT)))
+
+ (enum Pos
+ (in-module (Gtk CTree))
+ (c-name GtkCTreePos)
+ (value (name before) (c-name GTK_CTREE_POS_BEFORE))
+ (value (name as-child) (c-name GTK_CTREE_POS_AS_CHILD))
+ (value (name after) (c-name GTK_CTREE_POS_AFTER)))
+
+ ===
+ (flags) is just like enum, but some bindings may wrap enums and flags
+ differently.
+
+ ===
+
+ (boxed boxed-name
+ (in-module modname)
+ (c-name c-name)
+ (ref-func func-to-increase-refcount)
+ (copy-func func-to-copy)
+ (release-func func-to-destroy-or-decrement-refcount)
+ (field (type-and-name type-alias-of-struct-field
+ name-of-struct-field) (access access-rule)))
+
+ It is never OK to use memcpy() to copy a boxed type, or use
+ malloc()/free() to alloc/free one.
+
+ Ex:
+
+ (boxed Pixmap
+ (in-module (Gdk))
+ (c-name GdkPixmap)
+ (ref-func pixmap_ref)
+ (unref-func pixmap_unref))
+
+ An "object" declaration automatically implies the type definition:
+
+ (type
+ (alias concat-module-elements-and-boxed-name)
+ (in-c-name pointer-to-c-name)
+ (out-c-name pointer-to-pointer-to-c-name)
+ (inout-c-name pointer-to-c-name))
+
+ Ex:
+ (type (alias GdkPixmap)
+ (in-c-name GdkPixmap*)
+ (out-c-name GdkPixmap**)
+ (inout-c-name GdkPixmap*))
+
+ ===
+
+ (struct struct-name
+ (in-module modname)
+ (c-name c-name)
+ (field (type-and-name type-alias-of-struct-field
+ name-of-struct-field) (access access-rule)))
+
+ Ex:
+ (struct Rectangle
+ (in-module (Gdk))
+ (c-name GdkRectangle)
+ (field (type-and-name gint16 x) (access readwrite))
+ (field (type-and-name gint16 y) (access readwrite))
+ (field (type-and-name guint16 width) (access readwrite))
+ (field (type-and-name guint16 height) (access readwrite)))
+
+ Implies GdkRectangle type alias:
+
+ (type (alias GdkRectangle)
+ (in-c-name GdkRectangle*)
+ (out-c-name GdkRectangle*) ;; note - not the same as boxed
+ types
+ (inout-c-name GdkRectangle*))
+
+ ===
+
+ (user-function name
+ (in-module module)
+ (c-name c-typedef-name)
+ ;; return-type and parameters as for (function)
+ )
+
+ Ex:
+
+ (user-function PrintFunc
+ (in-module (Gtk))
+ (parameter in (type-and-name gpointer func_data))
+ (parameter in (type-and-name gchar* str)))
+
+ ===
+
+ (typedef new-name
+ (in-module module)
+ (c-name c-full-name)
+ (orig-type alias-of-orig-type))
+
+ Ex:
+
+ (typedef Type
+ (in-module (Gtk))
+ (c-name GtkType)
+ (orig-type guint))
+