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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/accessibility/ax_object_cache_lifecycle.h"
#include "base/notreached.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
#if DCHECK_IS_ON()
bool AXObjectCacheLifecycle::CanAdvanceTo(LifecycleState next_state) const {
// Can dispose from anywhere, unless already in process or complete.
if (next_state == kDisposing) {
return state_ != kDisposing && state_ != kDisposed;
}
switch (state_) {
case kUninitialized:
return next_state == kDeferTreeUpdates;
case kDeferTreeUpdates:
return next_state == kProcessDeferredUpdates;
case kProcessDeferredUpdates:
return next_state == kFinalizingTree;
case kFinalizingTree:
return next_state == kSerialize;
case kSerialize:
return false;
case kDisposing:
return next_state == kDisposed;
case kDisposed:
return false;
}
return false;
}
bool AXObjectCacheLifecycle::CanRewindTo(LifecycleState next_state) const {
return next_state == kDeferTreeUpdates && state_ != kDisposing &&
state_ != kDisposed;
}
#endif
#define DEBUG_STRING_CASE(StateName) \
case AXObjectCacheLifecycle::StateName: \
return #StateName
static String StateAsDebugString(
const AXObjectCacheLifecycle::LifecycleState& state) {
switch (state) {
DEBUG_STRING_CASE(kUninitialized);
DEBUG_STRING_CASE(kDeferTreeUpdates);
DEBUG_STRING_CASE(kProcessDeferredUpdates);
DEBUG_STRING_CASE(kFinalizingTree);
DEBUG_STRING_CASE(kSerialize);
DEBUG_STRING_CASE(kDisposing);
DEBUG_STRING_CASE(kDisposed);
}
NOTREACHED();
}
String AXObjectCacheLifecycle::ToString() const {
return StateAsDebugString(state_);
}
void AXObjectCacheLifecycle::AdvanceTo(LifecycleState next_state) {
#if DCHECK_IS_ON()
DCHECK(CanAdvanceTo(next_state))
<< "Cannot advance a11y lifecycle from " << StateAsDebugString(state_)
<< " to " << StateAsDebugString(next_state) << ".";
#endif
state_ = next_state;
}
void AXObjectCacheLifecycle::EnsureStateAtMost(LifecycleState state) {
#if DCHECK_IS_ON()
DCHECK(CanRewindTo(state))
<< "Cannot rewind a11y lifecycle from " << StateAsDebugString(state_)
<< " to " << StateAsDebugString(state) << ".";
#endif
state_ = state;
}
} // namespace blink
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