Add first sketch of the webmodules code generator.

third_party/WebKit/Source/bindings/scripts/code_generator_cpp.py

Index: third_party/WebKit/Source/bindings/scripts/code_generator_cpp.py
diff --git a/third_party/WebKit/Source/bindings/scripts/code_generator_cpp.py b/third_party/WebKit/Source/bindings/scripts/code_generator_cpp.py
new file mode 100644
index 0000000000000000000000000000000000000000..632d3b6e70ef3385d0ef38498917cb16b9e99a30
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/scripts/code_generator_cpp.py
@@ -0,0 +1,64 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.

[bashi, 2016/11/01 00:14:36]

I think we need to add code_generator_cpp.py in
Source/bindings/scripts/scripts.gni.

[dglazkov, 2016/11/04 21:03:07]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# pylint: disable=import-error,print-statement,relative-import
+
+"""Generates Blink CPP bindings.
+
+TODO(dglazkov): Write proper description here.

[haraken, 2016/10/30 18:02:28]

I want to write this in this CL :)

[dglazkov, 2016/11/04 21:03:07]

Done.

+"""
+
+import os
+import posixpath
+
+from code_generator import CodeGeneratorBase
+# TODO(dglazkov): Move TypedefResolver to code_generator.py
+from code_generator_v8 import TypedefResolver
+from v8_interface import interface_context
+
+MODULE_PYNAME = os.path.splitext(os.path.basename(__file__))[0] + '.py'
+
+
+class CodeGeneratorCpp(CodeGeneratorBase):

[haraken, 2016/10/30 18:02:28]

Rename "Cpp" to "WebModule", "ServiceAPI" or something better.

[dglazkov, 2016/11/04 21:03:07]

Done.

+    def __init__(self, info_provider, cache_dir, output_dir):
+        CodeGeneratorBase.__init__(self, MODULE_PYNAME, info_provider,
+                                   cache_dir, output_dir)
+        self.typedef_resolver = TypedefResolver(info_provider)
+
+    def get_template(self):
+        template_filename = 'cpp_interface.cpp.tmpl'
+        return self.jinja_env.get_template(template_filename)
+
+    # TODO(dglazkov): Move to CodeGeneratorBase.
+    def output_paths(self, definition_name):
+        header_path = posixpath.join(self.output_dir,
+                                     'Cpp%s.h' % definition_name)
+        cpp_path = posixpath.join(self.output_dir, 'Cpp%s.cpp' % definition_name)
+        return header_path, cpp_path
+
+    def generate_code(self, definitions, definition_name):
+        self.typedef_resolver.resolve(definitions, definition_name)
+        header_path, cpp_path = self.output_paths(definition_name)
+
+        template_context = {}
+        # TODO(dglazkov): Implement dictionaries
+        if definition_name in definitions.interfaces:
+            interface = definitions.interfaces[definition_name]
+            # TODO(dglazkov): Implement callback interfaces.
+            # TODO(dglazkov): Implement partial interfaces.
+            if not interface.is_callback and not interface.is_partial:
+                template_context = interface_context(

[bashi, 2016/11/01 00:14:36]

I'm wondering what kind of code CodeGeneratorCpp will/should generate. Could you
elaborate this a bit more?

[dglazkov, 2016/11/04 21:03:07]

I wrote up a brief description of the class. Hope it helps :)

+                    interface,
+                    definitions.interfaces)
+        template_context['code_generator'] = MODULE_PYNAME
+        template_context['class_name'] = definition_name
+
+        cpp_template = self.get_template()
+        cpp_text = cpp_template.render(template_context)
+
+        header_text = 'header'
+        return (
+            (header_path, header_text),
+            (cpp_path, cpp_text)
+        )