[Xcb] [PATCH proto] Add support for X Generic Extension events

[Daniel Martin]

With these patches, we are able to mark an XGE event as such and
generate the correct header for it.

XGE events can be found in the X Input Extension v2++.

Signed-off-by: Daniel Martin <consume.noise at gmail.com>
---
 doc/xml-xcb.txt  |  8 +++++++-
 src/xcb.xsd      |  1 +
 xcbgen/xtypes.py | 26 +++++++++++++++++++++-----
 3 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/doc/xml-xcb.txt b/doc/xml-xcb.txt
index cf6d14e..7311911 100644
--- a/doc/xml-xcb.txt
+++ b/doc/xml-xcb.txt
@@ -128,7 +128,8 @@ Top-Level Elements
   requests of the same type may be combined into a single request without
   affecting the semantics of the requests.
 
-<event name="identifier" number="integer" [no-sequence-number="true"]>
+<event name="identifier" number="integer"
+       [[no-sequence-number="true"] | [xge="true"]]>
   structure contents
 </event>
 
@@ -142,6 +143,11 @@ Top-Level Elements
   include a sequence number.  This is a special-case for the KeymapNotify
   event in the core protocol, and should not be used in any other event.
 
+  If the optional xge attribute is true, the event is an X Generic Event and
+  will be treated as such.
+
+  The no-sequence-number and xge attribute can not be combined.
+
 <error name="identifier" number="integer">
   structure contents
 </error>
diff --git a/src/xcb.xsd b/src/xcb.xsd
index 4ef269e..819495b 100644
--- a/src/xcb.xsd
+++ b/src/xcb.xsd
@@ -324,6 +324,7 @@ authorization from the authors.
               </xsd:sequence>
               <xsd:attribute name="no-sequence-number" type="xsd:boolean"
                              use="optional" />
+              <xsd:attribute name="xge" type="xsd:boolean" use="optional" />
             </xsd:extension>
           </xsd:complexContent>
         </xsd:complexType>
diff --git a/xcbgen/xtypes.py b/xcbgen/xtypes.py
index 5469cd9..a4614d9 100644
--- a/xcbgen/xtypes.py
+++ b/xcbgen/xtypes.py
@@ -602,25 +602,41 @@ class Event(ComplexType):
 
         self.has_seq = not bool(elt.get('no-sequence-number'))
 
+        self.is_ge_event = bool(elt.get('xge'))
+
         self.doc = None
         for item in list(elt):
             if item.tag == 'doc':
                 self.doc = Doc(name, item)
-            
+
     def add_opcode(self, opcode, name, main):
         self.opcodes[name] = opcode
         if main:
             self.name = name
 
     def resolve(self, module):
+        def add_event_header():
+            self.fields.append(Field(tcard8, tcard8.name, 'response_type', False, True, True))
+            if self.has_seq:
+                self.fields.append(_placeholder_byte)
+                self.fields.append(Field(tcard16, tcard16.name, 'sequence', False, True, True))
+
+        def add_ge_event_header():
+            self.fields.append(Field(tcard8,  tcard8.name,  'response_type', False, True, True))
+            self.fields.append(Field(tcard8,  tcard8.name,  'extension', False, True, True))
+            self.fields.append(Field(tcard16, tcard16.name, 'sequence', False, True, True))
+            self.fields.append(Field(tcard32, tcard32.name, 'length', False, True, True))
+            self.fields.append(Field(tcard16, tcard16.name, 'event_type', False, True, True))
+
         if self.resolved:
             return
 
         # Add the automatic protocol fields
-        self.fields.append(Field(tcard8, tcard8.name, 'response_type', False, True, True))
-        if self.has_seq:
-            self.fields.append(_placeholder_byte)
-            self.fields.append(Field(tcard16, tcard16.name, 'sequence', False, True, True))
+        if self.is_ge_event:
+            add_ge_event_header()
+        else:
+            add_event_header()
+
         ComplexType.resolve(self, module)
 
     out = __main__.output['event']
-- 
1.8.3