| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "win32/base/surrogate_pair_observer.h" |
| |
| #include "base/logging.h" |
| #include "win32/base/keyboard.h" |
| |
| namespace mozc { |
| namespace win32 { |
| namespace { |
| |
| // TODO(yukawa): Move this to util.cc. |
| char32 SurrogatePairToUCS4(wchar_t high, wchar_t low) { |
| return (((high - 0xD800) & 0x3FF) << 10) + |
| ((low - 0xDC00) & 0x3FF) + 0x10000; |
| } |
| |
| } // namespace |
| |
| SurrogatePairObserver::SurrogatePairObserver() |
| : state_(INITIAL_STATE), |
| surrogate_high_(L'\0'), |
| surrogate_low_(L'\0') {} |
| |
| SurrogatePairObserver::ClientAction SurrogatePairObserver::OnTestKeyEvent( |
| const VirtualKey &virtual_key, bool is_keydown) { |
| return OnKeyEvent(virtual_key, is_keydown, true); |
| } |
| |
| SurrogatePairObserver::ClientAction SurrogatePairObserver::OnKeyEvent( |
| const VirtualKey &virtual_key, bool is_keydown) { |
| return OnKeyEvent(virtual_key, is_keydown, false); |
| } |
| |
| SurrogatePairObserver::ClientAction SurrogatePairObserver::OnKeyEvent( |
| const VirtualKey &virtual_key, bool is_keydown, bool is_test_key) { |
| switch (state_) { |
| case INITIAL_STATE: { |
| if ((virtual_key.virtual_key() != VK_PACKET)) { |
| return ClientAction(DO_DEFAULT_ACTION, 0); |
| } |
| const wchar_t ucs2 = virtual_key.wide_char(); |
| if (IS_HIGH_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| if (!is_test_key) { |
| surrogate_high_ = ucs2; |
| state_ = WAIT_FOR_SURROGATE_HIGH_UP; |
| } |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| // Ignore orhpaned key-up of high surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (IS_LOW_SURROGATE(ucs2)) { |
| // Ignore orhpaned key-up/down of low surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs2); |
| } |
| case WAIT_FOR_SURROGATE_HIGH_UP: { |
| if ((virtual_key.virtual_key() != VK_PACKET)) { |
| return ClientAction(DO_DEFAULT_ACTION, 0); |
| } |
| const wchar_t ucs2 = virtual_key.wide_char(); |
| if (IS_HIGH_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| if (!is_test_key) { |
| surrogate_high_ = ucs2; |
| state_ = WAIT_FOR_SURROGATE_HIGH_UP; |
| } |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (ucs2 != surrogate_high_) { |
| // Ignore orhpaned key-up of high surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (!is_test_key) { |
| state_ = WAIT_FOR_SURROGATE_LOW_DOWM; |
| } |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (IS_LOW_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| const char32 ucs4 = SurrogatePairToUCS4(surrogate_high_, |
| ucs2); |
| if (!is_test_key) { |
| surrogate_low_ = ucs2; |
| state_ = WAIT_FOR_SURROGATE_LOW_UP; |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs4); |
| } |
| // Ignore orhpaned key-up of low surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs2); |
| } |
| case WAIT_FOR_SURROGATE_LOW_DOWM: { |
| if ((virtual_key.virtual_key() != VK_PACKET)) { |
| return ClientAction(DO_DEFAULT_ACTION, 0); |
| } |
| const wchar_t ucs2 = virtual_key.wide_char(); |
| if (IS_HIGH_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| if (!is_test_key) { |
| surrogate_high_ = ucs2; |
| state_ = WAIT_FOR_SURROGATE_HIGH_UP; |
| } |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| // Ignore orhpaned key-up of high surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (IS_LOW_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| const char32 ucs4 = SurrogatePairToUCS4(surrogate_high_, |
| ucs2); |
| if (!is_test_key) { |
| surrogate_low_ = ucs2; |
| state_ = WAIT_FOR_SURROGATE_LOW_UP; |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs4); |
| } |
| // Ignore orhpaned key-up of low surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (!is_test_key) { |
| state_ = INITIAL_STATE; |
| surrogate_high_ = L'\0'; |
| surrogate_low_ = L'\0'; |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs2); |
| } |
| case WAIT_FOR_SURROGATE_LOW_UP: { |
| if ((virtual_key.virtual_key() != VK_PACKET)) { |
| return ClientAction(DO_DEFAULT_ACTION, 0); |
| } |
| const wchar_t ucs2 = virtual_key.wide_char(); |
| if (IS_HIGH_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| if (!is_test_key) { |
| surrogate_high_ = ucs2; |
| state_ = WAIT_FOR_SURROGATE_HIGH_UP; |
| } |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| // Ignore orhpaned key-up of high surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (IS_LOW_SURROGATE(ucs2)) { |
| if (is_keydown) { |
| // Ignore orhpaned key-down of low surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| if (surrogate_low_ != ucs2) { |
| // Ignore orhpaned key-up of low surrogate. |
| return ClientAction(CONSUME_KEY_BUT_NEVER_SEND_TO_SERVER, 0); |
| } |
| const char32 ucs4 = SurrogatePairToUCS4(surrogate_high_, |
| surrogate_low_); |
| if (!is_test_key) { |
| state_ = INITIAL_STATE; |
| surrogate_high_ = L'\0'; |
| surrogate_low_ = L'\0'; |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs4); |
| } |
| if (!is_test_key) { |
| state_ = INITIAL_STATE; |
| surrogate_high_ = L'\0'; |
| surrogate_low_ = L'\0'; |
| } |
| return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs2); |
| } |
| default: |
| DLOG(FATAL) << "must not reach here."; |
| return ClientAction(DO_DEFAULT_ACTION, 0); |
| } |
| } |
| |
| } // namespace win32 |
| } // namespace mozc |