Move C functions out of ContentSuggestionsMediator

ios/chrome/browser/content_suggestions/mediator_util.mm

Index: ios/chrome/browser/content_suggestions/mediator_util.mm
diff --git a/ios/chrome/browser/content_suggestions/mediator_util.mm b/ios/chrome/browser/content_suggestions/mediator_util.mm
new file mode 100644
index 0000000000000000000000000000000000000000..99c40a13a568234fb2eb38de42c34d2159de7984
--- /dev/null
+++ b/ios/chrome/browser/content_suggestions/mediator_util.mm
@@ -0,0 +1,100 @@
+// Copyright 2017 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 "ios/chrome/browser/content_suggestions/mediator_util.h"
+
+#include "base/strings/sys_string_conversions.h"
+#include "components/ntp_snippets/category.h"
+#import "ios/chrome/browser/content_suggestions/content_suggestions_category_wrapper.h"
+#import "ios/chrome/browser/ui/content_suggestions/identifier/content_suggestion_identifier.h"
+#include "ios/chrome/grit/ios_strings.h"
+#include "ui/base/l10n/l10n_util_mac.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+void BindWrapper(
+    base::Callback<void(ntp_snippets::Status status_code,
+                        const std::vector<ntp_snippets::ContentSuggestion>&
+                            suggestions)> callback,
+    ntp_snippets::Status status_code,
+    std::vector<ntp_snippets::ContentSuggestion> suggestions) {
+  if (callback) {
+    callback.Run(status_code, suggestions);
+  }
+}
+
+ContentSuggestionType TypeForCategory(ntp_snippets::Category category) {
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::ARTICLES))
+    return ContentSuggestionTypeArticle;
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::READING_LIST))
+    return ContentSuggestionTypeReadingList;
+
+  return ContentSuggestionTypeEmpty;
+}
+
+ContentSuggestionsSectionID SectionIDForCategory(
+    ntp_snippets::Category category) {
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::BOOKMARKS))
+    return ContentSuggestionsSectionBookmarks;
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::ARTICLES))
+    return ContentSuggestionsSectionArticles;
+  if (category.IsKnownCategory(ntp_snippets::KnownCategories::READING_LIST))
+    return ContentSuggestionsSectionReadingList;
+
+  return ContentSuggestionsSectionUnknown;
+}
+
+ContentSuggestionsSectionLayout SectionLayoutForLayout(
+    ntp_snippets::ContentSuggestionsCardLayout layout) {
+  // For now, only cards are relevant.
+  return ContentSuggestionsSectionLayoutCard;
+}
+
+ContentSuggestion* ConvertContentSuggestion(
+    const ntp_snippets::ContentSuggestion& contentSuggestion) {
+  ContentSuggestion* suggestion = [[ContentSuggestion alloc] init];
+
+  suggestion.title = base::SysUTF16ToNSString(contentSuggestion.title());
+  suggestion.text = base::SysUTF16ToNSString(contentSuggestion.snippet_text());
+  suggestion.url = contentSuggestion.url();
+
+  suggestion.publisher =
+      base::SysUTF16ToNSString(contentSuggestion.publisher_name());
+  suggestion.publishDate = contentSuggestion.publish_date();
+
+  suggestion.suggestionIdentifier = [[ContentSuggestionIdentifier alloc] init];
+  suggestion.suggestionIdentifier.IDInSection =
+      contentSuggestion.id().id_within_category();
+
+  return suggestion;
+}
+
+ContentSuggestionsSectionInformation* SectionInformationFromCategoryInfo(
+    const base::Optional<ntp_snippets::CategoryInfo>& categoryInfo,
+    const ntp_snippets::Category& category) {
+  ContentSuggestionsSectionInformation* sectionInfo =
+      [[ContentSuggestionsSectionInformation alloc]
+          initWithSectionID:SectionIDForCategory(category)];
+  if (categoryInfo) {
+    sectionInfo.layout = SectionLayoutForLayout(categoryInfo->card_layout());
+    sectionInfo.showIfEmpty = categoryInfo->show_if_empty();
+    sectionInfo.emptyText =
+        base::SysUTF16ToNSString(categoryInfo->no_suggestions_message());
+    if (categoryInfo->additional_action() !=
+        ntp_snippets::ContentSuggestionsAdditionalAction::NONE) {
+      sectionInfo.footerTitle =
+          l10n_util::GetNSString(IDS_IOS_CONTENT_SUGGESTIONS_FOOTER_TITLE);
+    }
+    sectionInfo.title = base::SysUTF16ToNSString(categoryInfo->title());
+  }
+  return sectionInfo;
+}
+
+ntp_snippets::ContentSuggestion::ID SuggestionIDForSectionID(
+    ContentSuggestionsCategoryWrapper* category,
+    const std::string& id_in_category) {
+  return ntp_snippets::ContentSuggestion::ID(category.category, id_in_category);
+}