Add a console interface for logging to the JS console from a PPAPI plugin....

webkit/plugins/ppapi/ppb_console_impl.cc

+// Copyright (c) 2011 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.
+
+#include "webkit/plugins/ppapi/ppb_console_impl.h"
+
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
+#include "ppapi/c/dev/ppb_console_dev.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
+#include "webkit/plugins/ppapi/plugin_module.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+#include "webkit/plugins/ppapi/resource_tracker.h"
+#include "webkit/plugins/ppapi/var.h"
+
+using WebKit::WebConsoleMessage;
+using WebKit::WebString;
+
+namespace webkit {
+namespace ppapi {
+
+namespace {
+
+void LogWithSource(PP_Instance instance_id,
+                   PP_LogLevel_Dev level,
+                   PP_Var source,
+                   PP_Var value) {
+  PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
+  if (!instance)
+    return;
+
+  // Convert the log level, defaulting to error.
+  WebConsoleMessage::Level web_level;
+  switch (level) {
+    case PP_LOGLEVEL_TIP:
+      web_level = WebConsoleMessage::LevelTip;
+      break;
+    case PP_LOGLEVEL_LOG:
+      web_level = WebConsoleMessage::LevelLog;
+      break;
+    case PP_LOGLEVEL_WARNING:
+      web_level = WebConsoleMessage::LevelWarning;
+      break;
+    case PP_LOGLEVEL_ERROR:
+    default:
+      web_level = WebConsoleMessage::LevelError;
+      break;
+  }
+
+  // Format is the "<source>: <value>". The source defaults to the module name.
+  scoped_refptr<StringVar> source_string(StringVar::FromPPVar(source));
+  std::string message = source_string.get() ? source_string->value() :
+      instance->module()->name();
+  message.append(": ");
+  message.append(Var::PPVarToLogString(value));
+
+  // PP_Vars can contain embedded NULLs, don't pass these through. Even if the
+  // WebKit console handles it properly, you wouldn't be able to see them which
+  // is probably not useful.
+  std::string null;
+  null.push_back(0);
+  ReplaceSubstringsAfterOffset(&message, 0, null, "\\0");

[yzshen1, 2011/03/11 00:40:35]

We have duplicate code for escaping NULLs, and we have run it for |value|
already.

Can we consider to use Var::PPVarToLogString() for |source| as well?

+
+  instance->container()->element().document().frame()->addMessageToConsole(
+      WebConsoleMessage(web_level, WebString(UTF8ToUTF16(message))));
+}
+
+void Log(PP_Instance instance, PP_LogLevel_Dev level, PP_Var value) {
+  LogWithSource(instance, level, PP_MakeUndefined(), value);
+}
+
+const PPB_Console_Dev ppb_console = {
+  &Log,
+  &LogWithSource
+};
+
+}  // namespace
+
+// static
+const struct PPB_Console_Dev* PPB_Console_Impl::GetInterface() {
+  return &ppb_console;
+}
+
+}  // namespace ppapi
+}  // namespace webkit
+