Drag and dropping text, parsable as url

ui/base/dragdrop/drag_and_drop_url_utils.cc

+// Copyright (c) 2016 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 "ui/base/dragdrop/drag_and_drop_url_utils.h"
+
+#include "base/macros.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/url_formatter/url_fixer.h"
+#include "net/base/filename_util.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "url/gurl.h"
+
+namespace ui {
+
+namespace {
+
+base::Optional<GURL> TryToExtractPlainTextURL(const ui::OSExchangeData& data) {
+  base::string16 text;
+  if (!data.GetString(&text))
+    return {};
+  auto res = url_formatter::FixupURL(base::UTF16ToUTF8(text), "");

[sky, 2016/09/15 21:32:50]

""->std::string in all of these.

+  if (!res.is_valid())
+    return {};
+  return res;
+}
+
+}  // namespace
+
+bool CanBeInterpretedAsURL(const ui::OSExchangeData& data,
+                           ui::OSExchangeData::FilenameToURLPolicy policy) {
+  if (data.HasURL(policy))
+    return true;
+  return static_cast<bool>(TryToExtractPlainTextURL(data));
+}
+
+base::Optional<std::pair<GURL, base::string16>> TryToInterpretAsURL(
+    const ui::OSExchangeData& data,
+    ui::OSExchangeData::FilenameToURLPolicy policy) {
+  std::pair<GURL, base::string16> res;
+  if (data.GetURLAndTitle(policy, &res.first, &res.second))
+    return res;
+
+  auto opt_url = TryToExtractPlainTextURL(data);
+  if (!opt_url)
+    return {};
+  res.first = std::move(*opt_url);
+  res.second = net::GetSuggestedFilename(res.first, "", "", "", "", {});
+  return res;
+}
+
+}  // namespace ui