Initial implementation of WebUI generator (WUG) toolkit.

components/webui_generator/generator/view_model.py

Index: components/webui_generator/generator/view_model.py
diff --git a/components/webui_generator/generator/view_model.py b/components/webui_generator/generator/view_model.py
new file mode 100644
index 0000000000000000000000000000000000000000..a92080722d55202796f838e1a1afe541f6226791
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+++ b/components/webui_generator/generator/view_model.py
@@ -0,0 +1,329 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import datetime
+import util
+
+H_FILE_TEMPLATE = \
+"""// Copyright %(year)d The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// NOTE: this file is generated from "%(source)s". Do not modify directly.
+
+#ifndef %(include_guard)s
+#define %(include_guard)s
+
+#include "base/macros.h"
+#include "components/webui_generator/view_model.h"
+#include "%(export_h_include_path)s"
+
+namespace content {
+class BrowserContext;
+}
+
+%(children_forward_declarations)s
+
+namespace gen {
+
+class %(export_macro)s %(class_name)s : public ::webui_generator::ViewModel {
+ public:
+  using FactoryFunction = %(class_name)s* (*)(content::BrowserContext*);
+
+%(context_keys)s
+
+  static %(class_name)s* Create(content::BrowserContext* context);
+  static void SetFactory(FactoryFunction factory);
+
+  %(class_name)s();
+
+%(children_getters)s
+
+%(context_getters)s
+
+%(event_handlers)s
+
+ void Initialize() override {}
+ void OnAfterChildrenReady() override {}
+ void OnViewBound() override {}
+
+ private:
+  void OnEvent(const std::string& event) final;
+
+  static FactoryFunction factory_function_;
+};
+
+}  // namespace gen
+
+#endif  // %(include_guard)s
+"""
+
+CHILD_FORWARD_DECLARATION_TEMPLATE = \
+"""namespace gen {
+  class %(child_type)s;
+}
+"""
+CONTEXT_KEY_DECLARATION_TEMPLATE = \
+"""  static const char %s[];"""
+
+CHILD_GETTER_DECLARATION_TEMPLATE = \
+"""  virtual gen::%(child_type)s* %(method_name)s() const;""";
+
+CONTEXT_VALUE_GETTER_DECLARATION_TEMPLATE = \
+"""  %(type)s %(method_name)s() const;"""
+
+EVENT_HANDLER_DECLARATION_TEMPLATE = \
+"""  virtual void %s() = 0;"""
+
+CC_FILE_TEMPLATE = \
+"""// Copyright %(year)d The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// NOTE: this file is generated from "%(source)s". Do not modify directly.
+
+#include "%(header_path)s"
+
+#include "base/logging.h"
+#include "components/webui_generator/view.h"
+%(children_includes)s
+
+namespace gen {
+
+%(context_keys)s
+
+%(class_name)s::FactoryFunction %(class_name)s::factory_function_;
+
+%(class_name)s* %(class_name)s::Create(content::BrowserContext* context) {
+  CHECK(factory_function_) << "Factory function for %(class_name)s was not "
+      "set.";
+  return factory_function_(context);
+}
+
+void %(class_name)s::SetFactory(FactoryFunction factory) {
+  factory_function_ = factory;
+}
+
+%(class_name)s::%(class_name)s() {
+%(constructor_body)s
+}
+
+%(children_getters)s
+
+%(context_getters)s
+
+void %(class_name)s::OnEvent(const std::string& event) {
+%(event_dispatcher_body)s
+  LOG(ERROR) << "Unknown event '" << event << "'";
+}
+
+}  // namespace gen
+"""
+
+CONTEXT_KEY_DEFINITION_TEMPLATE = \
+"""const char %(class_name)s::%(name)s[] = "%(value)s";"""
+
+CHILD_GETTER_DEFINITION_TEMPLATE = \
+"""gen::%(child_type)s* %(class_name)s::%(method_name)s() const {
+  return static_cast<gen::%(child_type)s*>(
+      view()->GetChild("%(child_id)s")->GetViewModel());
+}
+"""
+
+CONTEXT_VALUE_GETTER_DEFINITION_TEMPLATE = \
+"""%(type)s %(class_name)s::%(method_name)s() const {
+    return context().%(context_getter)s(%(key_constant)s);
+}
+"""
+
+FIELD_TYPE_TO_GETTER_TYPE = {
+  'boolean': 'bool',
+  'integer': 'int',
+  'double': 'double',
+  'string': 'std::string',
+  'string_list': 'login::StringList'
+}
+
+DISPATCH_EVENT_TEMPLATE = \
+"""  if (event == "%(event_id)s") {
+    %(method_name)s();
+    return;
+  }"""
+
+def GetCommonSubistitutions(declaration):
+  subs = {}
+  subs['year'] = datetime.date.today().year
+  subs['class_name'] = declaration.view_model_class
+  subs['source'] = declaration.path
+  return subs
+
+def FieldNameToConstantName(field_name):
+  return 'kContextKey' + util.ToUpperCamelCase(field_name)
+
+def GenContextKeysDeclarations(fields):
+  return '\n'.join(
+      (CONTEXT_KEY_DECLARATION_TEMPLATE % \
+          FieldNameToConstantName(f.name) for f in fields))
+
+def GenChildrenForwardDeclarations(children):
+  lines = []
+  for declaration in set(children.itervalues()):
+    lines.append(CHILD_FORWARD_DECLARATION_TEMPLATE % {
+                     'child_type': declaration.view_model_class
+                 })
+  return '\n'.join(lines)
+
+def ChildIdToChildGetterName(id):
+  return 'Get%s' % util.ToUpperCamelCase(id)
+
+def GenChildrenGettersDeclarations(children):
+  lines = []
+  for id, declaration in children.iteritems():
+    lines.append(CHILD_GETTER_DECLARATION_TEMPLATE % {
+                     'child_type': declaration.view_model_class,
+                     'method_name': ChildIdToChildGetterName(id)
+                 })
+  return '\n'.join(lines)
+
+def FieldNameToGetterName(field_name):
+  return 'Get%s' % util.ToUpperCamelCase(field_name)
+
+def GenContextGettersDeclarations(context_fields):
+  lines = []
+  for field in context_fields:
+    lines.append(CONTEXT_VALUE_GETTER_DECLARATION_TEMPLATE % {
+                     'type': FIELD_TYPE_TO_GETTER_TYPE[field.type],
+                     'method_name': FieldNameToGetterName(field.name)
+                 })
+  return '\n'.join(lines)
+
+def EventIdToMethodName(event):
+  return 'On' + util.ToUpperCamelCase(event)
+
+def GenEventHandlersDeclarations(events):
+  lines = []
+  for event in events:
+    lines.append(EVENT_HANDLER_DECLARATION_TEMPLATE %
+                     EventIdToMethodName(event))
+  return '\n'.join(lines)
+
+def GenHFile(declaration):
+  subs = GetCommonSubistitutions(declaration)
+  subs['include_guard'] = \
+      util.PathToIncludeGuard(declaration.view_model_include_path)
+  subs['context_keys'] = GenContextKeysDeclarations(declaration.fields)
+  subs['children_forward_declarations'] = \
+      GenChildrenForwardDeclarations(declaration.children)
+  subs['children_getters'] = \
+      GenChildrenGettersDeclarations(declaration.children);
+  subs['context_getters'] = \
+      GenContextGettersDeclarations(declaration.fields);
+  subs['event_handlers'] = GenEventHandlersDeclarations(declaration.events)
+  subs['export_h_include_path'] = declaration.export_h_include_path
+  subs['export_macro'] = declaration.component_export_macro
+  return H_FILE_TEMPLATE % subs
+
+def GenContextKeysDefinitions(declaration):
+  lines = []
+  for field in declaration.fields:
+    definition = CONTEXT_KEY_DEFINITION_TEMPLATE % {
+      'class_name': declaration.view_model_class,
+      'name': FieldNameToConstantName(field.name),
+      'value': field.id
+    }
+    lines.append(definition)
+  return '\n'.join(lines)
+
+def GenChildrenIncludes(children):
+  lines = []
+  for declaration in set(children.itervalues()):
+    lines.append('#include "%s"' % declaration.view_model_include_path)
+  return '\n'.join(lines)
+
+def GenContextFieldInitialization(field):
+  lines = []
+  key_constant = FieldNameToConstantName(field.name)
+  setter_method = 'Set' + util.ToUpperCamelCase(field.type)
+  if field.type == 'string_list':
+    lines.append('  {')
+    lines.append('    std::vector<std::string> defaults;')
+    for s in field.default_value:
+      lines.append('    defaults.push_back("%s");' % s)
+    lines.append('    context().%s(%s, defaults);' %
+                     (setter_method, key_constant))
+    lines.append('  }')
+  else:
+    setter = '  context().%s(%s, ' % (setter_method, key_constant)
+    if field.type in ['integer', 'double']:
+      setter += str(field.default_value)
+    elif field.type == 'boolean':
+      setter += 'true' if field.default_value else 'false'
+    else:
+      assert field.type == 'string'
+      setter += '"%s"' % field.default_value
+    setter += ");"
+    lines.append(setter)
+  return '\n'.join(lines)
+
+def GenChildrenGettersDefenitions(declaration):
+  lines = []
+  for id, child in declaration.children.iteritems():
+    lines.append(CHILD_GETTER_DEFINITION_TEMPLATE % {
+                     'child_type': child.view_model_class,
+                     'class_name': declaration.view_model_class,
+                     'method_name': ChildIdToChildGetterName(id),
+                     'child_id': id
+                 });
+  return '\n'.join(lines)
+
+def GenContextGettersDefinitions(declaration):
+  lines = []
+  for field in declaration.fields:
+    lines.append(CONTEXT_VALUE_GETTER_DEFINITION_TEMPLATE % {
+                     'type': FIELD_TYPE_TO_GETTER_TYPE[field.type],
+                     'class_name': declaration.view_model_class,
+                     'method_name': FieldNameToGetterName(field.name),
+                     'context_getter': 'Get' + util.ToUpperCamelCase(
+                                                        field.type),
+                     'key_constant': FieldNameToConstantName(field.name)
+                 });
+  return '\n'.join(lines)
+
+def GenEventDispatcherBody(events):
+  lines = []
+  for event in events:
+    lines.append(DISPATCH_EVENT_TEMPLATE % {
+                     'event_id': util.ToLowerCamelCase(event),
+                     'method_name': EventIdToMethodName(event)
+                 });
+  return '\n'.join(lines)
+
+def GenCCFile(declaration):
+  subs = GetCommonSubistitutions(declaration)
+  subs['header_path'] = declaration.view_model_include_path
+  subs['context_keys'] = GenContextKeysDefinitions(declaration)
+  subs['children_includes'] = GenChildrenIncludes(declaration.children)
+  initializations = [GenContextFieldInitialization(field) \
+                         for field in declaration.fields]
+  initializations.append('  base::DictionaryValue diff;');
+  initializations.append('  context().GetChangesAndReset(&diff);');
+  subs['constructor_body'] = '\n'.join(initializations)
+  subs['children_getters'] = GenChildrenGettersDefenitions(declaration)
+  subs['context_getters'] = GenContextGettersDefinitions(declaration)
+  subs['event_dispatcher_body'] = GenEventDispatcherBody(declaration.events)
+  return CC_FILE_TEMPLATE % subs
+
+def ListOutputs(declaration, destination):
+  dirname = os.path.join(destination, os.path.dirname(declaration.path))
+  h_file_path = os.path.join(dirname, declaration.view_model_h_name)
+  cc_file_path = os.path.join(dirname, declaration.view_model_cc_name)
+  return [h_file_path, cc_file_path]
+
+def Gen(declaration, destination):
+  h_file_path, cc_file_path = ListOutputs(declaration, destination)
+  util.CreateDirIfNotExists(os.path.dirname(h_file_path))
+  open(h_file_path, 'w').write(GenHFile(declaration))
+  open(cc_file_path, 'w').write(GenCCFile(declaration))
+