Bye bye Mandoline

components/web_view/navigation_controller.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 "components/web_view/navigation_controller.h"
-
-#include <utility>
-
-#include "components/web_view/frame.h"
-#include "components/web_view/navigation_controller_delegate.h"
-#include "components/web_view/navigation_entry.h"
-#include "components/web_view/reload_type.h"
-
-namespace web_view {
-
-NavigationController::NavigationController(
-    NavigationControllerDelegate* delegate)
-    : pending_entry_(nullptr),
-      last_committed_entry_index_(-1),
-      pending_entry_index_(-1),
-      delegate_(delegate) {}
-
-NavigationController::~NavigationController() {
-  DiscardPendingEntry(false);
-}
-
-int NavigationController::GetCurrentEntryIndex() const {
-  if (pending_entry_index_ != -1)
-    return pending_entry_index_;
-  return last_committed_entry_index_;
-}
-
-int NavigationController::GetIndexForOffset(int offset) const {
-  return GetCurrentEntryIndex() + offset;
-}
-
-int NavigationController::GetEntryCount() const {
-  // TODO(erg): Have a max number of entries, and DCHECK that we are smaller
-  // than it here.
-  return static_cast<int>(entries_.size());
-}
-
-NavigationEntry* NavigationController::GetEntryAtIndex(int index) const {
-  if (index < 0 || index >= GetEntryCount())
-    return nullptr;
-
-  return entries_[index];
-}
-
-NavigationEntry* NavigationController::GetEntryAtOffset(int offset) const {
-  return GetEntryAtIndex(GetIndexForOffset(offset));
-}
-
-bool NavigationController::CanGoBack() const {
-  return CanGoToOffset(-1);
-}
-
-bool NavigationController::CanGoForward() const {
-  return CanGoToOffset(1);
-}
-
-bool NavigationController::CanGoToOffset(int offset) const {
-  int index = GetIndexForOffset(offset);
-  return index >= 0 && index < GetEntryCount();
-}
-
-void NavigationController::GoBack() {
-  if (!CanGoBack()) {
-    NOTREACHED();
-    return;
-  }
-
-  // Base the navigation on where we are now...
-  int current_index = GetCurrentEntryIndex();
-
-  DiscardPendingEntry(false);
-
-  pending_entry_index_ = current_index - 1;
-  // TODO(erg): Transition type handled here.
-  NavigateToPendingEntry(ReloadType::NO_RELOAD, true);
-}
-
-void NavigationController::GoForward() {
-  if (!CanGoForward()) {
-    NOTREACHED();
-    return;
-  }
-
-  // TODO(erg): The upstream version handles transience here.
-
-  // Base the navigation on where we are now...
-  int current_index = GetCurrentEntryIndex();
-
-  DiscardPendingEntry(false);
-
-  pending_entry_index_ = current_index + 1;
-  // TODO(erg): Transition type handled here.
-  NavigateToPendingEntry(ReloadType::NO_RELOAD, true);
-}
-
-void NavigationController::LoadURL(mojo::URLRequestPtr request) {
-  // TODO(erg): This mimics part of NavigationControllerImpl::LoadURL(), minus
-  // all the error checking.
-  SetPendingEntry(make_scoped_ptr(new NavigationEntry(std::move(request))));
-  NavigateToPendingEntry(ReloadType::NO_RELOAD, false);
-}
-
-void NavigationController::NavigateToPendingEntry(
-    ReloadType reload_type,
-    bool update_navigation_start_time) {
-  // TODO(erg): Deal with session history navigations while trying to navigate
-  // to a slow-to-commit page.
-
-  // TODO(erg): Deal with interstitials.
-
-  // For session history navigations only the pending_entry_index_ is set.
-  if (!pending_entry_) {
-    CHECK_NE(pending_entry_index_, -1);
-    pending_entry_ = entries_[pending_entry_index_];
-  }
-
-  // TODO(erg): Eventually, we need to deal with restoring the state of the
-  // full tree. For now, we'll just shell back to the WebView.
-  delegate_->OnNavigate(
-      pending_entry_->BuildURLRequest(update_navigation_start_time));
-}
-
-void NavigationController::DiscardPendingEntry(bool was_failure) {
-  // TODO(erg): We might copy the CHECK regarding NavigateToEntry here.
-
-  // TODO(erg): We need to maintain the failed_pending_entry_ during
-  // |was_failure| here.
-
-  if (pending_entry_index_ == -1)
-    delete pending_entry_;
-  pending_entry_ = nullptr;
-  pending_entry_index_ = -1;
-}
-
-void NavigationController::SetPendingEntry(scoped_ptr<NavigationEntry> entry) {
-  // TODO(erg): Should be DiscardNonCommittedEntries() if we start porting
-  // transient states over.
-  DiscardPendingEntry(false);
-  pending_entry_ = entry.release();
-  DCHECK_EQ(-1, pending_entry_index_);
-  // TODO(erg): The content code sends NOTIFICATION_NAV_ENTRY_PENDING here.
-}
-
-void NavigationController::FrameDidCommitProvisionalLoad(Frame* frame) {
-  // Our renderer is committing a frame. If this was a real implementation,
-  // we'd do something!
-  if (frame->parent())
-    return;
-
-  // TODO(erg): Need some equivalent of InsertOrReplaceEntry(), as we need to
-  // prune the history list.
-
-  // TODO(erg): We should copy all the logic from the various
-  // RendererDidNavigate* methods here.
-
-  // TODO(erg): Medium term, we shouldn't be reusing the NavigationEntry, as it
-  // appears that blink can change some of the data during the navigation. Do
-  // it for now for bootstrapping purposes.
-  if (pending_entry_index_ == -1 && pending_entry_) {
-    ClearForwardEntries();
-    entries_.push_back(pending_entry_);
-    last_committed_entry_index_ = static_cast<int>(entries_.size() - 1);
-    pending_entry_ = nullptr;
-  } else if (pending_entry_index_ != -1 && pending_entry_) {
-    last_committed_entry_index_ = pending_entry_index_;
-    pending_entry_ = nullptr;
-
-    // This was a historical navigation. In this limited prototype, we don't
-    // actually do anything with it.
-  } else {
-    LOG(ERROR)
-        << "Hit an unknown case in NavigationController::RendererDidNavigate";
-  }
-
-  DiscardPendingEntry(false);
-
-  delegate_->OnDidNavigate();
-}
-
-void NavigationController::FrameDidNavigateLocally(Frame* frame,
-                                                   const GURL& url) {
-  // If this is a local navigation of a non-top frame, don't try to commit
-  // it.
-  if (frame->parent())
-    return;
-
-  ClearForwardEntries();
-
-  // TODO(erg): This is overly cheap handling of local navigations in
-  // frames. We don't have all the information needed to construct a real
-  // URLRequest.
-
-  entries_.push_back(new NavigationEntry(url));
-  last_committed_entry_index_ = static_cast<int>(entries_.size() - 1);
-
-  delegate_->OnDidNavigate();
-}
-
-void NavigationController::ClearForwardEntries() {
-  int current_size = static_cast<int>(entries_.size());
-  if (current_size > 0) {
-    while (last_committed_entry_index_ < (current_size - 1)) {
-      entries_.pop_back();
-      current_size--;
-    }
-  }
-}
-
-}  // namespace web_view