Partially componentize //chrome/browser/search/search.{h,cc}

ios/chrome/browser/search/search_util.cc

+// 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.
+
+#include "ios/chrome/browser/search/search_util.h"
+
+#include "components/search/search.h"
+#include "components/search_engines/template_url_service.h"
+#include "ios/chrome/browser/search_engines/template_url_service_factory.h"
+#include "ios/chrome/browser/search_engines/ui_thread_search_terms_data.h"
+#include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/web/public/navigation_item.h"
+#include "ios/web/public/navigation_manager.h"
+#include "ios/web/public/web_state/web_state.h"
+#include "url/gurl.h"
+
+namespace {
+
+TemplateURL* GetDefaultSearchProviderTemplateURL(
+    ios::ChromeBrowserState* browser_state) {
+  if (!browser_state)
+    return nullptr;
+
+  TemplateURLService* template_url_service =
+      ios::TemplateURLServiceFactory::GetForBrowserState(browser_state);
+  return template_url_service ? template_url_service->GetDefaultSearchProvider()
+                              : nullptr;
+}
+
+}  // namespace
+
+base::string16 ExtractSearchTermsFromURL(ios::ChromeBrowserState* browser_state,
+                                         const GURL& url) {
+  base::string16 search_terms;
+  TemplateURL* template_url =
+      GetDefaultSearchProviderTemplateURL(browser_state);
+  if (template_url) {
+    template_url->ExtractSearchTermsFromURL(
+        url, ios::UIThreadSearchTermsData(browser_state), &search_terms);
+  }
+  return search_terms;
+}
+
+bool IsQueryExtractionAllowedForURL(ios::ChromeBrowserState* browser_state,
+                                    const GURL& url) {
+  TemplateURL* template_url =
+      GetDefaultSearchProviderTemplateURL(browser_state);
+  return template_url && search::IsSuitableURLForInstant(url, template_url);
+}
+
+base::string16 GetSearchTerms(web::WebState* web_state) {
+  if (!web_state)
+    return base::string16();
+
+  web::NavigationItem* item =
+      web_state->GetNavigationManager()->GetVisibleItem();
+  if (!item)
+    return base::string16();
+
+  if (!search::IsQueryExtractionEnabled())
+    return base::string16();
+
+  ios::ChromeBrowserState* browser_state =
+      ios::ChromeBrowserState::FromBrowserState(web_state->GetBrowserState());
+  if (!IsQueryExtractionAllowedForURL(browser_state, item->GetVirtualURL()))
+    return base::string16();
+
+  return ExtractSearchTermsFromURL(browser_state, item->GetVirtualURL());
+}