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/* -----------------------------------------------------------------------------
* This file is part of SWIG, which is licensed as a whole under version 3
* (or any later version) of the GNU General Public License. Some additional
* terms also apply to certain portions of SWIG. The full details of the SWIG
* license and copyrights can be found in the LICENSE and COPYRIGHT files
* included with the SWIG source code as distributed by the SWIG developers
* and at http://www.swig.org/legal.html.
*
* interface.cxx
*
* This module contains support for the interface feature.
* This feature is used in language modules where the target language does not
* naturally support C++ style multiple inheritance, but does support inheritance
* from multiple interfaces.
* ----------------------------------------------------------------------------- */
#include "swigmod.h"
static bool interface_feature_enabled = false;
/* -----------------------------------------------------------------------------
* collect_interface_methods()
*
* Create a list of all the methods from the base classes of class n that are
* marked as an interface. The resulting list is thus the list of methods that
* need to be implemented in order for n to be non-abstract.
* ----------------------------------------------------------------------------- */
static List *collect_interface_methods(Node *n) {
List *methods = NewList();
if (Hash *bases = Getattr(n, "interface:bases")) {
List *keys = Keys(bases);
for (Iterator base = First(keys); base.item; base = Next(base)) {
Node *cls = Getattr(bases, base.item);
if (cls == n)
continue;
for (Node *child = firstChild(cls); child; child = nextSibling(child)) {
if (Cmp(nodeType(child), "cdecl") == 0) {
if (GetFlag(child, "feature:ignore") || Getattr(child, "interface:owner"))
continue; // skip methods propagated to bases
Node *m = Copy(child);
set_nextSibling(m, NIL);
set_previousSibling(m, NIL);
Setattr(m, "interface:owner", cls);
Append(methods, m);
}
}
}
Delete(keys);
}
return methods;
}
/* -----------------------------------------------------------------------------
* collect_interface_bases
* ----------------------------------------------------------------------------- */
static void collect_interface_bases(Hash *bases, Node *n) {
if (Getattr(n, "feature:interface")) {
String *name = Getattr(n, "interface:name");
if (!Getattr(bases, name))
Setattr(bases, name, n);
}
if (List *baselist = Getattr(n, "bases")) {
for (Iterator base = First(baselist); base.item; base = Next(base)) {
if (!GetFlag(base.item, "feature:ignore")) {
if (Getattr(base.item, "feature:interface"))
collect_interface_bases(bases, base.item);
}
}
}
}
/* -----------------------------------------------------------------------------
* collect_interface_base_classes()
*
* Create a hash containing all the classes up the inheritance hierarchy
* marked with feature:interface (including this class n).
* Stops going up the inheritance chain as soon as a class is found without
* feature:interface.
* The idea is to find all the base interfaces that a class must implement.
* ----------------------------------------------------------------------------- */
static void collect_interface_base_classes(Node *n) {
if (Getattr(n, "feature:interface")) {
// check all bases are also interfaces
if (List *baselist = Getattr(n, "bases")) {
for (Iterator base = First(baselist); base.item; base = Next(base)) {
if (!GetFlag(base.item, "feature:ignore")) {
if (!Getattr(base.item, "feature:interface")) {
Swig_error(Getfile(n), Getline(n), "Base class '%s' of '%s' is not similarly marked as an interface.\n", SwigType_namestr(Getattr(base.item, "name")), SwigType_namestr(Getattr(n, "name")));
SWIG_exit(EXIT_FAILURE);
}
}
}
}
}
Hash *interface_bases = NewHash();
collect_interface_bases(interface_bases, n);
if (Len(interface_bases) == 0)
Delete(interface_bases);
else
Setattr(n, "interface:bases", interface_bases);
}
/* -----------------------------------------------------------------------------
* process_interface_name()
* ----------------------------------------------------------------------------- */
static void process_interface_name(Node *n) {
if (Getattr(n, "feature:interface")) {
String *interface_name = Getattr(n, "feature:interface:name");
if (!Len(interface_name)) {
Swig_error(Getfile(n), Getline(n), "The interface feature for '%s' is missing the name attribute.\n", SwigType_namestr(Getattr(n, "name")));
SWIG_exit(EXIT_FAILURE);
}
if (Strchr(interface_name, '%')) {
String *name = NewStringf(interface_name, Getattr(n, "sym:name"));
Setattr(n, "interface:name", name);
} else {
Setattr(n, "interface:name", interface_name);
}
}
}
/* -----------------------------------------------------------------------------
* Swig_interface_propagate_methods()
*
* Find all the base classes marked as an interface (with feature:interface) for
* class node n. For each of these, add all of its methods as methods of n so that
* n is not abstract. If class n is also marked as an interface, it will remain
* abstract and not have any methods added.
* ----------------------------------------------------------------------------- */
void Swig_interface_propagate_methods(Node *n) {
if (interface_feature_enabled) {
process_interface_name(n);
collect_interface_base_classes(n);
List *methods = collect_interface_methods(n);
bool is_interface = Getattr(n, "feature:interface") != 0;
for (Iterator mi = First(methods); mi.item; mi = Next(mi)) {
if (!is_interface && GetFlag(mi.item, "abstract"))
continue;
String *this_decl = Getattr(mi.item, "decl");
String *this_decl_resolved = SwigType_typedef_resolve_all(this_decl);
bool identically_overloaded_method = false; // true when a base class' method is implemented in n
if (SwigType_isfunction(this_decl_resolved)) {
String *name = Getattr(mi.item, "name");
for (Node *child = firstChild(n); child; child = nextSibling(child)) {
if (Getattr(child, "interface:owner"))
break; // at the end of the list are newly appended methods
if (checkAttribute(child, "name", name)) {
String *decl = SwigType_typedef_resolve_all(Getattr(child, "decl"));
identically_overloaded_method = Strcmp(decl, this_decl_resolved) == 0;
Delete(decl);
if (identically_overloaded_method)
break;
}
}
}
Delete(this_decl_resolved);
if (!identically_overloaded_method) {
// TODO: Fix if the method is overloaded with different arguments / has default args
appendChild(n, mi.item);
} else {
Delete(mi.item);
}
}
Delete(methods);
}
}
/* -----------------------------------------------------------------------------
* Swig_interface_feature_enable()
*
* Turn on interface feature support
* ----------------------------------------------------------------------------- */
void Swig_interface_feature_enable() {
interface_feature_enabled = true;
}
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