python declarative UI

- remove XML testing feature
- add 2 modules: bpyml - generic, bpyml_ui - blender spesific. nothing uses these now.

==bpyml_ui module==
defines BPyML_BaseUI and its draw() function which uses the bpyml member of the class instance self.draw_data & self.draw_header_data.

This way declarative ui is opt-in and easy to use by using BPyML_BaseUI as a mix-in class.

==bpyml module==

This module translates a python like XML representation into XML
or simple python blender/ui function calls.

    sometag(arg=10) [
        another(),
        another(key="value")
    ]

# converts into ...

    <sometag arg="10">
        <another/>
        <another key="value" />
    </sometag>

release/scripts/modules/bpyml_ui.py

@@ -0,0 +1,100 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
+
+import bpy as _bpy
+import bpyml
+from bpyml import TAG, ARGS, CHILDREN
+from types import ModuleType
+
+_uilayout_rna = _bpy.types.UILayout.bl_rna
+
+_uilayout_tags = ["ui"] + \
+    _uilayout_rna.properties.keys() + \
+    _uilayout_rna.functions.keys()
+
+# these need to be imported directly
+# >>> from bpyml_ui.locals import *
+locals = bpyml.tag_module("%s.locals" % __name__ , _uilayout_tags)
+
+
+def _parse_rna(prop, value):
+    if prop.type == 'FLOAT':
+        value = float(value)
+    elif prop.type == 'INT':
+        value = int(value)
+    elif prop.type == 'BOOLEAN':
+        if value in (True, False):
+            pass
+        else:
+            if value not in ("True", "False"):
+                raise Exception("invalid bool value: %s" % value)
+            value = bool(value == "True")
+    elif prop.type in ('STRING', 'ENUM'):
+        pass
+    elif prop.type == 'POINTER':
+        value = eval("_bpy." + value)
+    else:
+        raise Exception("type not supported %s.%s" % (prop.identifier, prop.type))
+    return value
+
+
+def _parse_rna_args(base, py_node):
+    rna_params = base.bl_rna.functions[py_node[TAG]].parameters
+    args = {}
+    for key, value in py_node[ARGS].items():
+        args[key] = _parse_rna(rna_params[key], value)
+    return args
+
+
+def _call_recursive(context, base, py_node):
+    prop = base.bl_rna.properties.get(py_node[TAG])
+    if py_node[TAG] in base.bl_rna.properties:
+        value = py_node[ARGS].get("expr")
+        if value:
+            value = eval(value, {"context": _bpy.context})
+            setattr(base, py_node[TAG], value)
+        else:
+            value = py_node[ARGS]['value'] # have to have this
+            setattr(base, name, value)
+    else:
+        args = _parse_rna_args(base, py_node)
+        func_new = getattr(base, py_node[TAG])
+        base_new = func_new(**args) # call blender func
+        if base_new is not None:
+            for py_node_child in py_node[CHILDREN]:
+                _call_recursive(context, base_new, py_node_child)
+
+
+class BPyML_BaseUI():
+    '''
+    This is a mix-in class that defines a draw function
+    which checks for draw_data
+    '''
+
+    def draw(self, context):
+        layout = self.layout
+        for py_node in self.draw_data[CHILDREN]:
+            _call_recursive(context, layout, py_node)
+
+    def draw_header(self, context):
+        layout = self.layout
+        for py_node in self.draw_header_data[CHILDREN]:
+            _call_recursive(context, layout, py_node)