Merge pull request #9736 from Cartucho/const_and_class_to_json

* Adding constants to json file

* adding sub-module to constants name

* adding namespace to functions

* adding namespace to classes

* remove namespace from methods

* static methods

* python signatures generation

* python: more fixes for signatures generation

Python names existence can be checked via command:

    python -c "import cv2 as cv; print(repr(<py_name>))"

modules/python/src2/gen2.py

@@ -3,6 +3,7 @@
 from __future__ import print_function
 import hdr_parser, sys, re, os
 from string import Template
+from pprint import pprint
 
 if sys.version_info[0] >= 3:
     from io import StringIO
@@ -806,12 +807,26 @@ class FuncInfo(object):
         code += "\n    return %s;\n}\n\n" % def_ret
 
         cname = self.cname
+        classinfo = None
+        #dump = False
+        #if dump: pprint(vars(self))
+        #if dump: pprint(vars(self.variants[0]))
         if self.classname:
             classinfo = all_classes[self.classname]
+            #if dump: pprint(vars(classinfo))
+            if self.isconstructor:
+                py_name = 'cv.' + classinfo.wname
+            elif self.isclassmethod:
+                py_name = '.'.join([self.namespace, classinfo.sname + '_' + self.variants[0].wname])
+            else:
                 cname = classinfo.cname + '::' + cname
+                py_name = 'cv.' + classinfo.wname + '.' + self.variants[0].wname
+        else:
+            py_name = '.'.join([self.namespace, self.variants[0].wname])
+        #if dump: print(cname + " => " + py_name)
         py_signatures = codegen.py_signatures.setdefault(cname, [])
         for v in self.variants:
-            s = dict(name=v.name, arg=v.py_arg_str, ret=v.py_return_str)
+            s = dict(name=py_name, arg=v.py_arg_str, ret=v.py_return_str)
             for old in py_signatures:
                 if s == old:
                     break
@@ -855,6 +870,16 @@ class PythonWrapperGenerator(object):
             sys.exit(-1)
         self.classes[classinfo.name] = classinfo
 
+        # Add Class to json file.
+        namespace, classes, name = self.split_decl_name(name)
+        namespace = '.'.join(namespace)
+        name = '_'.join(classes+[name])
+
+        py_name = 'cv.' + classinfo.wname  # use wrapper name
+        py_signatures = self.py_signatures.setdefault(classinfo.cname, [])
+        py_signatures.append(dict(name=py_name))
+        #print('class: ' + classinfo.cname + " => " + py_name)
+
     def split_decl_name(self, name):
         chunks = name.split('.')
         namespace = chunks[:-1]
@@ -876,6 +901,12 @@ class PythonWrapperGenerator(object):
             sys.exit(-1)
         ns.consts[name] = cname
 
+        value = decl[1]
+        py_name = '.'.join([namespace, name])
+        py_signatures = self.py_signatures.setdefault(cname, [])
+        py_signatures.append(dict(name=py_name, value=value))
+        #print(cname + ' => ' + str(py_name) + ' (value=' + value + ')')
+
     def add_func(self, decl):
         namespace, classes, barename = self.split_decl_name(decl[0])
         cname = "::".join(namespace+classes+[barename])