| // 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. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_STATE_MACHINES_FORWARD_CODE_POINT_STATE_MACHINE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_STATE_MACHINES_FORWARD_CODE_POINT_STATE_MACHINE_H_ |
| |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/editing/state_machines/text_segmentation_machine_state.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/text/unicode.h" |
| |
| namespace blink { |
| |
| class CORE_EXPORT ForwardCodePointStateMachine { |
| STACK_ALLOCATED(); |
| |
| public: |
| ForwardCodePointStateMachine(); |
| ~ForwardCodePointStateMachine() = default; |
| |
| // Prepares by feeding preceding text. |
| TextSegmentationMachineState FeedPrecedingCodeUnit(UChar code_unit); |
| |
| // Finds boundary offset by feeding following text. |
| TextSegmentationMachineState FeedFollowingCodeUnit(UChar code_unit); |
| |
| // Returns true if we are at code point boundary. |
| bool AtCodePointBoundary(); |
| |
| // Returns the next boundary offset. |
| int GetBoundaryOffset(); |
| |
| // Resets the internal state to the initial state. |
| void Reset(); |
| |
| private: |
| enum class ForwardCodePointState; |
| |
| // The number of code units to be deleted. |
| // Nothing to delete if there is an invalid surrogate pair. |
| int code_units_to_be_deleted_ = 0; |
| |
| // The internal state. |
| ForwardCodePointState state_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ForwardCodePointStateMachine); |
| }; |
| |
| } // namespace blink |
| |
| #endif |