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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "core/editing/state_machines/BackwardCodePointStateMachine.h" |
| 6 |
| 7 #include "testing/gtest/include/gtest/gtest.h" |
| 8 |
| 9 namespace blink { |
| 10 |
| 11 namespace { |
| 12 const TextSegmentationMachineState kInvalid = |
| 13 TextSegmentationMachineState::Invalid; |
| 14 const TextSegmentationMachineState kNeedMoreCodeUnit = |
| 15 TextSegmentationMachineState::NeedMoreCodeUnit; |
| 16 const TextSegmentationMachineState kFinished = |
| 17 TextSegmentationMachineState::Finished; |
| 18 } // namespace |
| 19 |
| 20 TEST(BackwardCodePointStateMachineTest, DoNothingCase) { |
| 21 BackwardCodePointStateMachine machine; |
| 22 EXPECT_EQ(0, machine.getBoundaryOffset()); |
| 23 } |
| 24 |
| 25 TEST(BackwardCodePointStateMachineTest, SingleCharacter) { |
| 26 BackwardCodePointStateMachine machine; |
| 27 EXPECT_EQ(kFinished, machine.feedPrecedingCodeUnit('a')); |
| 28 EXPECT_EQ(-1, machine.getBoundaryOffset()); |
| 29 |
| 30 machine.reset(); |
| 31 EXPECT_EQ(kFinished, machine.feedPrecedingCodeUnit('-')); |
| 32 EXPECT_EQ(-1, machine.getBoundaryOffset()); |
| 33 |
| 34 machine.reset(); |
| 35 EXPECT_EQ(kFinished, machine.feedPrecedingCodeUnit('\t')); |
| 36 EXPECT_EQ(-1, machine.getBoundaryOffset()); |
| 37 |
| 38 machine.reset(); |
| 39 // U+3042 HIRAGANA LETTER A. |
| 40 EXPECT_EQ(kFinished, machine.feedPrecedingCodeUnit(0x3042)); |
| 41 EXPECT_EQ(-1, machine.getBoundaryOffset()); |
| 42 } |
| 43 |
| 44 TEST(BackwardCodePointStateMachineTest, SurrogatePair) { |
| 45 BackwardCodePointStateMachine machine; |
| 46 |
| 47 // U+20BB7 is \uD83D\uDDFA in UTF-16. |
| 48 const UChar leadSurrogate = 0xD842; |
| 49 const UChar trailSurrogate = 0xDFB7; |
| 50 |
| 51 EXPECT_EQ(kNeedMoreCodeUnit, machine.feedPrecedingCodeUnit(trailSurrogate)); |
| 52 EXPECT_EQ(kFinished, machine.feedPrecedingCodeUnit(leadSurrogate)); |
| 53 EXPECT_EQ(-2, machine.getBoundaryOffset()); |
| 54 |
| 55 // Edge cases |
| 56 // Unpaired trailing surrogate. Nothing to delete. |
| 57 machine.reset(); |
| 58 EXPECT_EQ(kNeedMoreCodeUnit, machine.feedPrecedingCodeUnit(trailSurrogate)); |
| 59 EXPECT_EQ(kInvalid, machine.feedPrecedingCodeUnit('a')); |
| 60 EXPECT_EQ(0, machine.getBoundaryOffset()); |
| 61 |
| 62 machine.reset(); |
| 63 EXPECT_EQ(kNeedMoreCodeUnit, machine.feedPrecedingCodeUnit(trailSurrogate)); |
| 64 EXPECT_EQ(kInvalid, machine.feedPrecedingCodeUnit(trailSurrogate)); |
| 65 EXPECT_EQ(0, machine.getBoundaryOffset()); |
| 66 |
| 67 // Unpaired leading surrogate. Nothing to delete. |
| 68 machine.reset(); |
| 69 EXPECT_EQ(kInvalid, machine.feedPrecedingCodeUnit(leadSurrogate)); |
| 70 EXPECT_EQ(0, machine.getBoundaryOffset()); |
| 71 } |
| 72 |
| 73 } // namespace blink |
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