g-ir-compiler: Add support for callback fields on GObjects

Use ParseState enum instead of a boolean for the ParseContexts embedded_type
flag. This allows specific tracking of the embedded type currently being
parsed which can now either be STATE_STRUCT_FIELD or STATE_CLASS_FIELD (or
allow for future expansion). Add ParseState::STATE_NONE as the default for
this field.

Fix GObject FieldBlob validation to take into account the sizeof
CallbackBlobs (copied from the struct validator).

Add static g_object_info_get_field_offset which parallels
g_struct_info_get_field_offset which is needed since callback fields may
vary in size.

https://bugzilla.gnome.org/show_bug.cgi?id=725198

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/scanner/Regress-1.0-Gjs-expected/Regress.TestObj.function_ptr.page b/tests/scanner/Regress-1.0-Gjs-expected/Regress.TestObj.function_ptr.page
new file mode 100644
index 00000000..d9f3754c
--- /dev/null
+++ b/tests/scanner/Regress-1.0-Gjs-expected/Regress.TestObj.function_ptr.page
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<page id="Regress.TestObj.function_ptr"
+      type="topic"
+      style="callback"
+      xmlns="http://projectmallard.org/1.0/"
+      xmlns:api="http://projectmallard.org/experimental/api/"
+      xmlns:ui="http://projectmallard.org/1.0/ui/">
+  <info>
+    <link xref="index" group="callback" type="guide"/>
+  </info>
+  <title>Regress.TestObj.function_ptr</title>
+  <synopsis><code mime="text/x-gjs">
+function onfunction_ptr(): void {
+}
+  </code></synopsis>
+
+
+
+</page>