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// Copyright 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_EDITING_STATE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_EDITING_STATE_H_
#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
namespace blink {
// EditingState represents current editing command running state for propagating
// DOM tree mutation operation failure to callers.
//
// Example usage:
// EditingState editingState;
// ...
// functionMutatesDOMTree(..., &editingState);
// if (editingState.isAborted())
// return;
//
class CORE_EXPORT EditingState final {
STACK_ALLOCATED();
public:
EditingState();
void Abort();
bool IsAborted() const { return is_aborted_; }
private:
bool is_aborted_ = false;
DISALLOW_COPY_AND_ASSIGN(EditingState);
};
// TODO(yosin): Once all commands aware |EditingState|, we get rid of
// |IgnorableEditingAbortState | class
class IgnorableEditingAbortState final {
STACK_ALLOCATED();
public:
IgnorableEditingAbortState();
~IgnorableEditingAbortState();
EditingState* GetEditingState() { return &editing_state_; }
private:
EditingState editing_state_;
DISALLOW_COPY_AND_ASSIGN(IgnorableEditingAbortState);
};
// Abort the editing command if the specified expression is true.
#define ABORT_EDITING_COMMAND_IF(expr) \
do { \
if (expr) { \
editing_state->Abort(); \
return; \
} \
} while (false)
#if DCHECK_IS_ON()
// This class is inspired by |NoExceptionStateAssertionChecker|.
class NoEditingAbortChecker final {
STACK_ALLOCATED();
public:
NoEditingAbortChecker(const char* file, int line);
~NoEditingAbortChecker();
EditingState* GetEditingState() { return &editing_state_; }
private:
EditingState editing_state_;
const char* const file_;
int const line_;
DISALLOW_COPY_AND_ASSIGN(NoEditingAbortChecker);
};
// If a function with EditingState* argument should not be aborted,
// ASSERT_NO_EDITING_ABORT should be specified.
// fooFunc(...., ASSERT_NO_EDITING_ABORT);
// It causes an assertion failure If DCHECK_IS_ON() and the function was aborted
// unexpectedly.
#define ASSERT_NO_EDITING_ABORT \
(NoEditingAbortChecker(__FILE__, __LINE__).GetEditingState())
#else
#define ASSERT_NO_EDITING_ABORT (IgnorableEditingAbortState().GetEditingState())
#endif
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_EDITING_STATE_H_
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