Add copy and free function annotations for POD types

Plain Old Data (POD) types with or without a representation in the GType
type system can still have a copy and/or a free function. We should
allow annotating these types with their corresponding functions for
copying their data into a new instance, and freeing their data.

From a language bindings perspective, POD types should have a boxed
GType wrapper around them, so they can use the generic GBoxed API to
copy and free instances; from a documentation perspective, though, it'd
be good to have a way to match a structured type, like a struct or a
union, with its copy and free functions.

In order to do that, we add two new header block annotations:

- (copy-func function_name)
- (free-func function_name)

These annotations work exactly like ref-func and unref-func for typed
instances:

    /**
     * GdkRGBA: (copy-func gdk_rgba_copy)
     *   (free-func gdk_rgba_free)
     * @red: ...
     * @green: ...
     * @blue: ...
     * @alpha: ...
     *
     * ...
     */

The function is stored in the GIR data as two new attributes for the
`<record>` and `<union>` elements:

    <record name="RGBA"
            c:type="GdkRGBA"
            copy-function="gdk_rgba_copy"
            free-function="gdk_rgba_free"
            glib:type-name="GdkRGBA"
            glib:get-type="gdk_rgba_get_type"
            c:symbol-prefix="gdk_rgba">

The annotations are not mandatory.

See: #14

1 files changed, 6 insertions, 0 deletions

diff --git a/giscanner/girparser.py b/giscanner/girparser.py
index 5fc22899..2f8c5f66 100644
--- a/giscanner/girparser.py
+++ b/giscanner/girparser.py
@@ -462,14 +462,20 @@ class GIRParser(object):
     def _parse_record(self, node, anonymous=False):
         struct = self._parse_compound(ast.Record, node)
         is_gtype_struct_for = node.attrib.get(_glibns('is-gtype-struct-for'))
+        copy_func = node.attrib.get('copy-function')
+        free_func = node.attrib.get('free-function')
         if is_gtype_struct_for is not None:
             struct.is_gtype_struct_for = self._namespace.type_from_name(is_gtype_struct_for)
+        struct.copy_func = copy_func
+        struct.free_func = free_func
         if not anonymous:
             self._namespace.append(struct)
         return struct
 
     def _parse_union(self, node, anonymous=False):
         union = self._parse_compound(ast.Union, node)
+        union.copy_func = node.attrib.get('copy-function')
+        union.free_func = node.attrib.get('free-function')
         if not anonymous:
             self._namespace.append(union)
         return union