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dart / external / github.com / flutter / engine / 368fe27d23dc34b93ae38414c5d6a508851829c6 / . / third_party / txt / tests / LayoutUtilsTest.cpp
blob: 1c57e4b9030e129475800a98ffe368bfef366295 [file] [log] [blame]
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include "UnicodeUtils.h"
#include "minikin/LayoutUtils.h"
namespace minikin {
void ExpectNextWordBreakForCache(size_t offset_in, const char* query_str) {
const size_t BUF_SIZE = 256U;
uint16_t buf[BUF_SIZE];
size_t expected_breakpoint = 0U;
size_t size = 0U;
ParseUnicode(buf, BUF_SIZE, query_str, &size, &expected_breakpoint);
EXPECT_EQ(expected_breakpoint, getNextWordBreakForCache(buf, offset_in, size))
<< "Expected position is [" << query_str << "] from offset " << offset_in;
}
void ExpectPrevWordBreakForCache(size_t offset_in, const char* query_str) {
const size_t BUF_SIZE = 256U;
uint16_t buf[BUF_SIZE];
size_t expected_breakpoint = 0U;
size_t size = 0U;
ParseUnicode(buf, BUF_SIZE, query_str, &size, &expected_breakpoint);
EXPECT_EQ(expected_breakpoint, getPrevWordBreakForCache(buf, offset_in, size))
<< "Expected position is [" << query_str << "] from offset " << offset_in;
}
TEST(WordBreakTest, goNextWordBreakTest) {
ExpectNextWordBreakForCache(0, "|");
// Continue for spaces.
ExpectNextWordBreakForCache(0, "'a' 'b' 'c' 'd' |");
ExpectNextWordBreakForCache(1, "'a' 'b' 'c' 'd' |");
ExpectNextWordBreakForCache(2, "'a' 'b' 'c' 'd' |");
ExpectNextWordBreakForCache(3, "'a' 'b' 'c' 'd' |");
ExpectNextWordBreakForCache(4, "'a' 'b' 'c' 'd' |");
ExpectNextWordBreakForCache(1000, "'a' 'b' 'c' 'd' |");
// Space makes word break.
ExpectNextWordBreakForCache(0, "'a' 'b' | U+0020 'c' 'd'");
ExpectNextWordBreakForCache(1, "'a' 'b' | U+0020 'c' 'd'");
ExpectNextWordBreakForCache(2, "'a' 'b' U+0020 | 'c' 'd'");
ExpectNextWordBreakForCache(3, "'a' 'b' U+0020 'c' 'd' |");
ExpectNextWordBreakForCache(4, "'a' 'b' U+0020 'c' 'd' |");
ExpectNextWordBreakForCache(5, "'a' 'b' U+0020 'c' 'd' |");
ExpectNextWordBreakForCache(1000, "'a' 'b' U+0020 'c' 'd' |");
ExpectNextWordBreakForCache(0, "'a' 'b' | U+2000 'c' 'd'");
ExpectNextWordBreakForCache(1, "'a' 'b' | U+2000 'c' 'd'");
ExpectNextWordBreakForCache(2, "'a' 'b' U+2000 | 'c' 'd'");
ExpectNextWordBreakForCache(3, "'a' 'b' U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(4, "'a' 'b' U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(5, "'a' 'b' U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(1000, "'a' 'b' U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(0, "'a' 'b' | U+2000 U+2000 'c' 'd'");
ExpectNextWordBreakForCache(1, "'a' 'b' | U+2000 U+2000 'c' 'd'");
ExpectNextWordBreakForCache(2, "'a' 'b' U+2000 | U+2000 'c' 'd'");
ExpectNextWordBreakForCache(3, "'a' 'b' U+2000 U+2000 | 'c' 'd'");
ExpectNextWordBreakForCache(4, "'a' 'b' U+2000 U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(5, "'a' 'b' U+2000 U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(6, "'a' 'b' U+2000 U+2000 'c' 'd' |");
ExpectNextWordBreakForCache(1000, "'a' 'b' U+2000 U+2000 'c' 'd' |");
// CJK ideographs makes word break.
ExpectNextWordBreakForCache(0, "U+4E00 | U+4E00 U+4E00 U+4E00 U+4E00");
ExpectNextWordBreakForCache(1, "U+4E00 U+4E00 | U+4E00 U+4E00 U+4E00");
ExpectNextWordBreakForCache(2, "U+4E00 U+4E00 U+4E00 | U+4E00 U+4E00");
ExpectNextWordBreakForCache(3, "U+4E00 U+4E00 U+4E00 U+4E00 | U+4E00");
ExpectNextWordBreakForCache(4,
"U+4E00 U+4E00 U+4E00 U+4E00 U+4E00 |");
ExpectNextWordBreakForCache(5,
"U+4E00 U+4E00 U+4E00 U+4E00 U+4E00 |");
ExpectNextWordBreakForCache(1000,
"U+4E00 U+4E00 U+4E00 U+4E00 U+4E00 |");
ExpectNextWordBreakForCache(0, "U+4E00 | U+4E8C U+4E09 U+56DB U+4E94");
ExpectNextWordBreakForCache(1, "U+4E00 U+4E8C | U+4E09 U+56DB U+4E94");
ExpectNextWordBreakForCache(2, "U+4E00 U+4E8C U+4E09 | U+56DB U+4E94");
ExpectNextWordBreakForCache(3, "U+4E00 U+4E8C U+4E09 U+56DB | U+4E94");
ExpectNextWordBreakForCache(4,
"U+4E00 U+4E8C U+4E09 U+56DB U+4E94 |");
ExpectNextWordBreakForCache(5,
"U+4E00 U+4E8C U+4E09 U+56DB U+4E94 |");
ExpectNextWordBreakForCache(1000,
"U+4E00 U+4E8C U+4E09 U+56DB U+4E94 |");
ExpectNextWordBreakForCache(0, "U+4E00 'a' 'b' | U+2000 'c' U+4E00");
ExpectNextWordBreakForCache(1, "U+4E00 'a' 'b' | U+2000 'c' U+4E00");
ExpectNextWordBreakForCache(2, "U+4E00 'a' 'b' | U+2000 'c' U+4E00");
ExpectNextWordBreakForCache(3, "U+4E00 'a' 'b' U+2000 | 'c' U+4E00");
ExpectNextWordBreakForCache(4, "U+4E00 'a' 'b' U+2000 'c' | U+4E00");
ExpectNextWordBreakForCache(5, "U+4E00 'a' 'b' U+2000 'c' U+4E00 |");
ExpectNextWordBreakForCache(1000, "U+4E00 'a' 'b' U+2000 'c' U+4E00 |");
// Continue if trailing characters is Unicode combining characters.
ExpectNextWordBreakForCache(0, "U+4E00 U+0332 | U+4E00");
ExpectNextWordBreakForCache(1, "U+4E00 U+0332 | U+4E00");
ExpectNextWordBreakForCache(2, "U+4E00 U+0332 U+4E00 |");
ExpectNextWordBreakForCache(3, "U+4E00 U+0332 U+4E00 |");
ExpectNextWordBreakForCache(1000, "U+4E00 U+0332 U+4E00 |");
// Surrogate pairs.
ExpectNextWordBreakForCache(0, "U+1F60D U+1F618 |");
ExpectNextWordBreakForCache(1, "U+1F60D U+1F618 |");
ExpectNextWordBreakForCache(2, "U+1F60D U+1F618 |");
ExpectNextWordBreakForCache(3, "U+1F60D U+1F618 |");
ExpectNextWordBreakForCache(4, "U+1F60D U+1F618 |");
ExpectNextWordBreakForCache(1000, "U+1F60D U+1F618 |");
// Broken surrogate pairs.
// U+D84D is leading surrogate but there is no trailing surrogate for it.
ExpectNextWordBreakForCache(0, "U+D84D U+1F618 |");
ExpectNextWordBreakForCache(1, "U+D84D U+1F618 |");
ExpectNextWordBreakForCache(2, "U+D84D U+1F618 |");
ExpectNextWordBreakForCache(3, "U+D84D U+1F618 |");
ExpectNextWordBreakForCache(1000, "U+D84D U+1F618 |");
ExpectNextWordBreakForCache(0, "U+1F618 U+D84D |");
ExpectNextWordBreakForCache(1, "U+1F618 U+D84D |");
ExpectNextWordBreakForCache(2, "U+1F618 U+D84D |");
ExpectNextWordBreakForCache(3, "U+1F618 U+D84D |");
ExpectNextWordBreakForCache(1000, "U+1F618 U+D84D |");
// U+DE0D is trailing surrogate but there is no leading surrogate for it.
ExpectNextWordBreakForCache(0, "U+DE0D U+1F618 |");
ExpectNextWordBreakForCache(1, "U+DE0D U+1F618 |");
ExpectNextWordBreakForCache(2, "U+DE0D U+1F618 |");
ExpectNextWordBreakForCache(3, "U+DE0D U+1F618 |");
ExpectNextWordBreakForCache(1000, "U+DE0D U+1F618 |");
ExpectNextWordBreakForCache(0, "U+1F618 U+DE0D |");
ExpectNextWordBreakForCache(1, "U+1F618 U+DE0D |");
ExpectNextWordBreakForCache(2, "U+1F618 U+DE0D |");
ExpectNextWordBreakForCache(3, "U+1F618 U+DE0D |");
ExpectNextWordBreakForCache(1000, "U+1F618 U+DE0D |");
// Regional indicator pair. U+1F1FA U+1F1F8 is US national flag.
ExpectNextWordBreakForCache(0, "U+1F1FA U+1F1F8 |");
ExpectNextWordBreakForCache(1, "U+1F1FA U+1F1F8 |");
ExpectNextWordBreakForCache(2, "U+1F1FA U+1F1F8 |");
ExpectNextWordBreakForCache(1000, "U+1F1FA U+1F1F8 |");
// Tone marks.
// CJK ideographic char + Tone mark + CJK ideographic char
ExpectNextWordBreakForCache(0, "U+4444 U+302D | U+4444");
ExpectNextWordBreakForCache(1, "U+4444 U+302D | U+4444");
ExpectNextWordBreakForCache(2, "U+4444 U+302D U+4444 |");
ExpectNextWordBreakForCache(3, "U+4444 U+302D U+4444 |");
ExpectNextWordBreakForCache(1000, "U+4444 U+302D U+4444 |");
// Variation Selectors.
// CJK Ideographic char + Variation Selector(VS1) + CJK Ideographic char
ExpectNextWordBreakForCache(0, "U+845B U+FE00 | U+845B");
ExpectNextWordBreakForCache(1, "U+845B U+FE00 | U+845B");
ExpectNextWordBreakForCache(2, "U+845B U+FE00 U+845B |");
ExpectNextWordBreakForCache(3, "U+845B U+FE00 U+845B |");
ExpectNextWordBreakForCache(1000, "U+845B U+FE00 U+845B |");
// CJK Ideographic char + Variation Selector(VS17) + CJK Ideographic char
ExpectNextWordBreakForCache(0, "U+845B U+E0100 | U+845B");
ExpectNextWordBreakForCache(1, "U+845B U+E0100 | U+845B");
ExpectNextWordBreakForCache(2, "U+845B U+E0100 | U+845B");
ExpectNextWordBreakForCache(3, "U+845B U+E0100 U+845B |");
ExpectNextWordBreakForCache(4, "U+845B U+E0100 U+845B |");
ExpectNextWordBreakForCache(5, "U+845B U+E0100 U+845B |");
ExpectNextWordBreakForCache(1000, "U+845B U+E0100 U+845B |");
// CJK ideographic char + Tone mark + Variation Character(VS1)
ExpectNextWordBreakForCache(0, "U+4444 U+302D U+FE00 | U+4444");
ExpectNextWordBreakForCache(1, "U+4444 U+302D U+FE00 | U+4444");
ExpectNextWordBreakForCache(2, "U+4444 U+302D U+FE00 | U+4444");
ExpectNextWordBreakForCache(3, "U+4444 U+302D U+FE00 U+4444 |");
ExpectNextWordBreakForCache(4, "U+4444 U+302D U+FE00 U+4444 |");
ExpectNextWordBreakForCache(1000, "U+4444 U+302D U+FE00 U+4444 |");
// CJK ideographic char + Tone mark + Variation Character(VS17)
ExpectNextWordBreakForCache(0, "U+4444 U+302D U+E0100 | U+4444");
ExpectNextWordBreakForCache(1, "U+4444 U+302D U+E0100 | U+4444");
ExpectNextWordBreakForCache(2, "U+4444 U+302D U+E0100 | U+4444");
ExpectNextWordBreakForCache(3, "U+4444 U+302D U+E0100 | U+4444");
ExpectNextWordBreakForCache(4, "U+4444 U+302D U+E0100 U+4444 |");
ExpectNextWordBreakForCache(5, "U+4444 U+302D U+E0100 U+4444 |");
ExpectNextWordBreakForCache(1000, "U+4444 U+302D U+E0100 U+4444 |");
// CJK ideographic char + Variation Character(VS1) + Tone mark
ExpectNextWordBreakForCache(0, "U+4444 U+FE00 U+302D | U+4444");
ExpectNextWordBreakForCache(1, "U+4444 U+FE00 U+302D | U+4444");
ExpectNextWordBreakForCache(2, "U+4444 U+FE00 U+302D | U+4444");
ExpectNextWordBreakForCache(3, "U+4444 U+FE00 U+302D U+4444 |");
ExpectNextWordBreakForCache(4, "U+4444 U+FE00 U+302D U+4444 |");
ExpectNextWordBreakForCache(1000, "U+4444 U+FE00 U+302D U+4444 |");
// CJK ideographic char + Variation Character(VS17) + Tone mark
ExpectNextWordBreakForCache(0, "U+4444 U+E0100 U+302D | U+4444");
ExpectNextWordBreakForCache(1, "U+4444 U+E0100 U+302D | U+4444");
ExpectNextWordBreakForCache(2, "U+4444 U+E0100 U+302D | U+4444");
ExpectNextWordBreakForCache(3, "U+4444 U+E0100 U+302D | U+4444");
ExpectNextWordBreakForCache(4, "U+4444 U+E0100 U+302D U+4444 |");
ExpectNextWordBreakForCache(5, "U+4444 U+E0100 U+302D U+4444 |");
ExpectNextWordBreakForCache(1000, "U+4444 U+E0100 U+302D U+4444 |");
// Following test cases are unusual usage of variation selectors and tone
// marks for caching up the further behavior changes, e.g. index of bounds
// or crashes. Please feel free to update the test expectations if the
// behavior change makes sense to you.
// Isolated Tone marks and Variation Selectors
ExpectNextWordBreakForCache(0, "U+FE00 |");
ExpectNextWordBreakForCache(1, "U+FE00 |");
ExpectNextWordBreakForCache(1000, "U+FE00 |");
ExpectNextWordBreakForCache(0, "U+E0100 |");
ExpectNextWordBreakForCache(1000, "U+E0100 |");
ExpectNextWordBreakForCache(0, "U+302D |");
ExpectNextWordBreakForCache(1000, "U+302D |");
// CJK Ideographic char + Variation Selector(VS1) + Variation Selector(VS1)
ExpectNextWordBreakForCache(0, "U+845B U+FE00 U+FE00 | U+845B");
ExpectNextWordBreakForCache(1, "U+845B U+FE00 U+FE00 | U+845B");
ExpectNextWordBreakForCache(2, "U+845B U+FE00 U+FE00 | U+845B");
ExpectNextWordBreakForCache(3, "U+845B U+FE00 U+FE00 U+845B |");
ExpectNextWordBreakForCache(4, "U+845B U+FE00 U+FE00 U+845B |");
ExpectNextWordBreakForCache(1000, "U+845B U+FE00 U+FE00 U+845B |");
// CJK Ideographic char + Variation Selector(VS17) + Variation Selector(VS17)
ExpectNextWordBreakForCache(0, "U+845B U+E0100 U+E0100 | U+845B");
ExpectNextWordBreakForCache(1, "U+845B U+E0100 U+E0100 | U+845B");
ExpectNextWordBreakForCache(2, "U+845B U+E0100 U+E0100 | U+845B");
ExpectNextWordBreakForCache(3, "U+845B U+E0100 U+E0100 | U+845B");
ExpectNextWordBreakForCache(4, "U+845B U+E0100 U+E0100 | U+845B");
ExpectNextWordBreakForCache(5, "U+845B U+E0100 U+E0100 U+845B |");
ExpectNextWordBreakForCache(6, "U+845B U+E0100 U+E0100 U+845B |");
ExpectNextWordBreakForCache(1000, "U+845B U+E0100 U+E0100 U+845B |");
// CJK Ideographic char + Variation Selector(VS1) + Variation Selector(VS17)
ExpectNextWordBreakForCache(0, "U+845B U+FE00 U+E0100 | U+845B");
ExpectNextWordBreakForCache(1, "U+845B U+FE00 U+E0100 | U+845B");
ExpectNextWordBreakForCache(2, "U+845B U+FE00 U+E0100 | U+845B");
ExpectNextWordBreakForCache(3, "U+845B U+FE00 U+E0100 | U+845B");
ExpectNextWordBreakForCache(4, "U+845B U+FE00 U+E0100 U+845B |");
ExpectNextWordBreakForCache(5, "U+845B U+FE00 U+E0100 U+845B |");
ExpectNextWordBreakForCache(1000, "U+845B U+FE00 U+E0100 U+845B |");
// CJK Ideographic char + Variation Selector(VS17) + Variation Selector(VS1)
ExpectNextWordBreakForCache(0, "U+845B U+E0100 U+FE00 | U+845B");
ExpectNextWordBreakForCache(1, "U+845B U+E0100 U+FE00 | U+845B");
ExpectNextWordBreakForCache(2, "U+845B U+E0100 U+FE00 | U+845B");
ExpectNextWordBreakForCache(3, "U+845B U+E0100 U+FE00 | U+845B");
ExpectNextWordBreakForCache(4, "U+845B U+E0100 U+FE00 U+845B |");
ExpectNextWordBreakForCache(5, "U+845B U+E0100 U+FE00 U+845B |");
ExpectNextWordBreakForCache(1000, "U+845B U+E0100 U+FE00 U+845B |");
// Tone mark. + Tone mark
ExpectNextWordBreakForCache(0, "U+4444 U+302D U+302D | U+4444");
ExpectNextWordBreakForCache(1, "U+4444 U+302D U+302D | U+4444");
ExpectNextWordBreakForCache(2, "U+4444 U+302D U+302D | U+4444");
ExpectNextWordBreakForCache(3, "U+4444 U+302D U+302D U+4444 |");
ExpectNextWordBreakForCache(4, "U+4444 U+302D U+302D U+4444 |");
ExpectNextWordBreakForCache(1000, "U+4444 U+302D U+302D U+4444 |");
}
TEST(WordBreakTest, goPrevWordBreakTest) {
ExpectPrevWordBreakForCache(0, "|");
// Continue for spaces.
ExpectPrevWordBreakForCache(0, "| 'a' 'b' 'c' 'd'");
ExpectPrevWordBreakForCache(1, "| 'a' 'b' 'c' 'd'");
ExpectPrevWordBreakForCache(2, "| 'a' 'b' 'c' 'd'");
ExpectPrevWordBreakForCache(3, "| 'a' 'b' 'c' 'd'");
ExpectPrevWordBreakForCache(4, "| 'a' 'b' 'c' 'd'");
ExpectPrevWordBreakForCache(1000, "| 'a' 'b' 'c' 'd'");
// Space makes word break.
ExpectPrevWordBreakForCache(0, "| 'a' 'b' U+0020 'c' 'd'");
ExpectPrevWordBreakForCache(1, "| 'a' 'b' U+0020 'c' 'd'");
ExpectPrevWordBreakForCache(2, "| 'a' 'b' U+0020 'c' 'd'");
ExpectPrevWordBreakForCache(3, "'a' 'b' | U+0020 'c' 'd'");
ExpectPrevWordBreakForCache(4, "'a' 'b' U+0020 | 'c' 'd'");
ExpectPrevWordBreakForCache(5, "'a' 'b' U+0020 | 'c' 'd'");
ExpectPrevWordBreakForCache(1000, "'a' 'b' U+0020 | 'c' 'd'");
ExpectPrevWordBreakForCache(0, "| 'a' 'b' U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(1, "| 'a' 'b' U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(2, "| 'a' 'b' U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(3, "'a' 'b' | U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(4, "'a' 'b' U+2000 | 'c' 'd'");
ExpectPrevWordBreakForCache(5, "'a' 'b' U+2000 | 'c' 'd'");
ExpectPrevWordBreakForCache(1000, "'a' 'b' U+2000 | 'c' 'd'");
ExpectPrevWordBreakForCache(0, "| 'a' 'b' U+2000 U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(1, "| 'a' 'b' U+2000 U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(2, "| 'a' 'b' U+2000 U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(3, "'a' 'b' | U+2000 U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(4, "'a' 'b' U+2000 | U+2000 'c' 'd'");
ExpectPrevWordBreakForCache(5, "'a' 'b' U+2000 U+2000 | 'c' 'd'");
ExpectPrevWordBreakForCache(6, "'a' 'b' U+2000 U+2000 | 'c' 'd'");
ExpectPrevWordBreakForCache(1000, "'a' 'b' U+2000 U+2000 | 'c' 'd'");
// CJK ideographs makes word break.
ExpectPrevWordBreakForCache(0, "| U+4E00 U+4E00 U+4E00 U+4E00 U+4E00");
ExpectPrevWordBreakForCache(1, "| U+4E00 U+4E00 U+4E00 U+4E00 U+4E00");
ExpectPrevWordBreakForCache(2, "U+4E00 | U+4E00 U+4E00 U+4E00 U+4E00");
ExpectPrevWordBreakForCache(3, "U+4E00 U+4E00 | U+4E00 U+4E00 U+4E00");
ExpectPrevWordBreakForCache(4, "U+4E00 U+4E00 U+4E00 | U+4E00 U+4E00");
ExpectPrevWordBreakForCache(5, "U+4E00 U+4E00 U+4E00 U+4E00 | U+4E00");
ExpectPrevWordBreakForCache(1000, "U+4E00 U+4E00 U+4E00 U+4E00 | U+4E00");
ExpectPrevWordBreakForCache(0, "| U+4E00 U+4E8C U+4E09 U+56DB U+4E94");
ExpectPrevWordBreakForCache(1, "| U+4E00 U+4E8C U+4E09 U+56DB U+4E94");
ExpectPrevWordBreakForCache(2, "U+4E00 | U+4E8C U+4E09 U+56DB U+4E94");
ExpectPrevWordBreakForCache(3, "U+4E00 U+4E8C | U+4E09 U+56DB U+4E94");
ExpectPrevWordBreakForCache(4, "U+4E00 U+4E8C U+4E09 | U+56DB U+4E94");
ExpectPrevWordBreakForCache(5, "U+4E00 U+4E8C U+4E09 U+56DB | U+4E94");
ExpectPrevWordBreakForCache(1000, "U+4E00 U+4E8C U+4E09 U+56DB | U+4E94");
// Mixed case.
ExpectPrevWordBreakForCache(0, "| U+4E00 'a' 'b' U+2000 'c' U+4E00");
ExpectPrevWordBreakForCache(1, "| U+4E00 'a' 'b' U+2000 'c' U+4E00");
ExpectPrevWordBreakForCache(2, "| U+4E00 'a' 'b' U+2000 'c' U+4E00");
ExpectPrevWordBreakForCache(3, "| U+4E00 'a' 'b' U+2000 'c' U+4E00");
ExpectPrevWordBreakForCache(4, "U+4E00 'a' 'b' | U+2000 'c' U+4E00");
ExpectPrevWordBreakForCache(5, "U+4E00 'a' 'b' U+2000 | 'c' U+4E00");
ExpectPrevWordBreakForCache(6, "U+4E00 'a' 'b' U+2000 'c' | U+4E00");
ExpectPrevWordBreakForCache(1000, "U+4E00 'a' 'b' U+2000 'c' | U+4E00");
// Continue if trailing characters is Unicode combining characters.
ExpectPrevWordBreakForCache(0, "| U+4E00 U+0332 U+4E00");
ExpectPrevWordBreakForCache(1, "| U+4E00 U+0332 U+4E00");
ExpectPrevWordBreakForCache(2, "| U+4E00 U+0332 U+4E00");
ExpectPrevWordBreakForCache(3, "U+4E00 U+0332 | U+4E00");
ExpectPrevWordBreakForCache(1000, "U+4E00 U+0332 | U+4E00");
// Surrogate pairs.
ExpectPrevWordBreakForCache(0, "| U+1F60D U+1F618");
ExpectPrevWordBreakForCache(1, "| U+1F60D U+1F618");
ExpectPrevWordBreakForCache(2, "| U+1F60D U+1F618");
ExpectPrevWordBreakForCache(3, "| U+1F60D U+1F618");
ExpectPrevWordBreakForCache(4, "| U+1F60D U+1F618");
ExpectPrevWordBreakForCache(1000, "| U+1F60D U+1F618");
// Broken surrogate pairs.
// U+D84D is leading surrogate but there is no trailing surrogate for it.
ExpectPrevWordBreakForCache(0, "| U+D84D U+1F618");
ExpectPrevWordBreakForCache(1, "| U+D84D U+1F618");
ExpectPrevWordBreakForCache(2, "| U+D84D U+1F618");
ExpectPrevWordBreakForCache(3, "| U+D84D U+1F618");
ExpectPrevWordBreakForCache(1000, "| U+D84D U+1F618");
ExpectPrevWordBreakForCache(0, "| U+1F618 U+D84D");
ExpectPrevWordBreakForCache(1, "| U+1F618 U+D84D");
ExpectPrevWordBreakForCache(2, "| U+1F618 U+D84D");
ExpectPrevWordBreakForCache(3, "| U+1F618 U+D84D");
ExpectPrevWordBreakForCache(1000, "| U+1F618 U+D84D");
// U+DE0D is trailing surrogate but there is no leading surrogate for it.
ExpectPrevWordBreakForCache(0, "| U+DE0D U+1F618");
ExpectPrevWordBreakForCache(1, "| U+DE0D U+1F618");
ExpectPrevWordBreakForCache(2, "| U+DE0D U+1F618");
ExpectPrevWordBreakForCache(3, "| U+DE0D U+1F618");
ExpectPrevWordBreakForCache(1000, "| U+DE0D U+1F618");
ExpectPrevWordBreakForCache(0, "| U+1F618 U+DE0D");
ExpectPrevWordBreakForCache(1, "| U+1F618 U+DE0D");
ExpectPrevWordBreakForCache(2, "| U+1F618 U+DE0D");
ExpectPrevWordBreakForCache(3, "| U+1F618 U+DE0D");
ExpectPrevWordBreakForCache(1000, "| U+1F618 U+DE0D");
// Regional indicator pair. U+1F1FA U+1F1F8 is US national flag.
ExpectPrevWordBreakForCache(0, "| U+1F1FA U+1F1F8");
ExpectPrevWordBreakForCache(1, "| U+1F1FA U+1F1F8");
ExpectPrevWordBreakForCache(2, "| U+1F1FA U+1F1F8");
ExpectPrevWordBreakForCache(1000, "| U+1F1FA U+1F1F8");
// Tone marks.
// CJK ideographic char + Tone mark + CJK ideographic char
ExpectPrevWordBreakForCache(0, "| U+4444 U+302D U+4444");
ExpectPrevWordBreakForCache(1, "| U+4444 U+302D U+4444");
ExpectPrevWordBreakForCache(2, "| U+4444 U+302D U+4444");
ExpectPrevWordBreakForCache(3, "U+4444 U+302D | U+4444");
ExpectPrevWordBreakForCache(1000, "U+4444 U+302D | U+4444");
// Variation Selectors.
// CJK Ideographic char + Variation Selector(VS1) + CJK Ideographic char
ExpectPrevWordBreakForCache(0, "| U+845B U+FE00 U+845B");
ExpectPrevWordBreakForCache(1, "| U+845B U+FE00 U+845B");
ExpectPrevWordBreakForCache(2, "| U+845B U+FE00 U+845B");
ExpectPrevWordBreakForCache(3, "U+845B U+FE00 | U+845B");
ExpectPrevWordBreakForCache(1000, "U+845B U+FE00 | U+845B");
// CJK Ideographic char + Variation Selector(VS17) + CJK Ideographic char
ExpectPrevWordBreakForCache(0, "| U+845B U+E0100 U+845B");
ExpectPrevWordBreakForCache(1, "| U+845B U+E0100 U+845B");
ExpectPrevWordBreakForCache(2, "| U+845B U+E0100 U+845B");
ExpectPrevWordBreakForCache(3, "| U+845B U+E0100 U+845B");
ExpectPrevWordBreakForCache(4, "U+845B U+E0100 | U+845B");
ExpectPrevWordBreakForCache(5, "U+845B U+E0100 | U+845B");
ExpectPrevWordBreakForCache(1000, "U+845B U+E0100 | U+845B");
// CJK ideographic char + Tone mark + Variation Character(VS1)
ExpectPrevWordBreakForCache(0, "| U+4444 U+302D U+FE00 U+4444");
ExpectPrevWordBreakForCache(1, "| U+4444 U+302D U+FE00 U+4444");
ExpectPrevWordBreakForCache(2, "| U+4444 U+302D U+FE00 U+4444");
ExpectPrevWordBreakForCache(3, "| U+4444 U+302D U+FE00 U+4444");
ExpectPrevWordBreakForCache(4, "U+4444 U+302D U+FE00 | U+4444");
ExpectPrevWordBreakForCache(1000, "U+4444 U+302D U+FE00 | U+4444");
// CJK ideographic char + Tone mark + Variation Character(VS17)
ExpectPrevWordBreakForCache(0, "| U+4444 U+302D U+E0100 U+4444");
ExpectPrevWordBreakForCache(1, "| U+4444 U+302D U+E0100 U+4444");
ExpectPrevWordBreakForCache(2, "| U+4444 U+302D U+E0100 U+4444");
ExpectPrevWordBreakForCache(3, "| U+4444 U+302D U+E0100 U+4444");
ExpectPrevWordBreakForCache(4, "| U+4444 U+302D U+E0100 U+4444");
ExpectPrevWordBreakForCache(5, "U+4444 U+302D U+E0100 | U+4444");
ExpectPrevWordBreakForCache(1000, "U+4444 U+302D U+E0100 | U+4444");
// CJK ideographic char + Variation Character(VS1) + Tone mark
ExpectPrevWordBreakForCache(0, "| U+4444 U+FE00 U+302D U+4444");
ExpectPrevWordBreakForCache(1, "| U+4444 U+FE00 U+302D U+4444");
ExpectPrevWordBreakForCache(2, "| U+4444 U+FE00 U+302D U+4444");
ExpectPrevWordBreakForCache(3, "| U+4444 U+FE00 U+302D U+4444");
ExpectPrevWordBreakForCache(4, "U+4444 U+FE00 U+302D | U+4444");
ExpectPrevWordBreakForCache(1000, "U+4444 U+FE00 U+302D | U+4444");
// CJK ideographic char + Variation Character(VS17) + Tone mark
ExpectPrevWordBreakForCache(0, "| U+4444 U+E0100 U+302D U+4444");
ExpectPrevWordBreakForCache(1, "| U+4444 U+E0100 U+302D U+4444");
ExpectPrevWordBreakForCache(2, "| U+4444 U+E0100 U+302D U+4444");
ExpectPrevWordBreakForCache(3, "| U+4444 U+E0100 U+302D U+4444");
ExpectPrevWordBreakForCache(4, "| U+4444 U+E0100 U+302D U+4444");
ExpectPrevWordBreakForCache(5, "U+4444 U+E0100 U+302D | U+4444");
ExpectPrevWordBreakForCache(1000, "U+4444 U+E0100 U+302D | U+4444");
// Following test cases are unusual usage of variation selectors and tone
// marks for caching up the further behavior changes, e.g. index of bounds
// or crashes. Please feel free to update the test expectations if the
// behavior change makes sense to you.
// Isolated Tone marks and Variation Selectors
ExpectPrevWordBreakForCache(0, "| U+FE00");
ExpectPrevWordBreakForCache(1, "| U+FE00");
ExpectPrevWordBreakForCache(1000, "| U+FE00");
ExpectPrevWordBreakForCache(0, "| U+E0100");
ExpectPrevWordBreakForCache(1000, "| U+E0100");
ExpectPrevWordBreakForCache(0, "| U+302D");
ExpectPrevWordBreakForCache(1000, "| U+302D");
// CJK Ideographic char + Variation Selector(VS1) + Variation Selector(VS1)
ExpectPrevWordBreakForCache(0, "| U+845B U+FE00 U+FE00 U+845B");
ExpectPrevWordBreakForCache(1, "| U+845B U+FE00 U+FE00 U+845B");
ExpectPrevWordBreakForCache(2, "| U+845B U+FE00 U+FE00 U+845B");
ExpectPrevWordBreakForCache(3, "| U+845B U+FE00 U+FE00 U+845B");
ExpectPrevWordBreakForCache(4, "U+845B U+FE00 U+FE00 | U+845B");
ExpectPrevWordBreakForCache(1000, "U+845B U+FE00 U+FE00 | U+845B");
// CJK Ideographic char + Variation Selector(VS17) + Variation Selector(VS17)
ExpectPrevWordBreakForCache(0, "| U+845B U+E0100 U+E0100 U+845B");
ExpectPrevWordBreakForCache(1, "| U+845B U+E0100 U+E0100 U+845B");
ExpectPrevWordBreakForCache(2, "| U+845B U+E0100 U+E0100 U+845B");
ExpectPrevWordBreakForCache(3, "| U+845B U+E0100 U+E0100 U+845B");
ExpectPrevWordBreakForCache(4, "| U+845B U+E0100 U+E0100 U+845B");
ExpectPrevWordBreakForCache(5, "| U+845B U+E0100 U+E0100 U+845B");
ExpectPrevWordBreakForCache(6, "U+845B U+E0100 U+E0100 | U+845B");
ExpectPrevWordBreakForCache(1000, "U+845B U+E0100 U+E0100 | U+845B");
// CJK Ideographic char + Variation Selector(VS1) + Variation Selector(VS17)
ExpectPrevWordBreakForCache(0, "| U+845B U+FE00 U+E0100 U+845B");
ExpectPrevWordBreakForCache(1, "| U+845B U+FE00 U+E0100 U+845B");
ExpectPrevWordBreakForCache(2, "| U+845B U+FE00 U+E0100 U+845B");
ExpectPrevWordBreakForCache(3, "| U+845B U+FE00 U+E0100 U+845B");
ExpectPrevWordBreakForCache(4, "| U+845B U+FE00 U+E0100 U+845B");
ExpectPrevWordBreakForCache(5, "U+845B U+FE00 U+E0100 | U+845B");
ExpectPrevWordBreakForCache(1000, "U+845B U+FE00 U+E0100 | U+845B");
// CJK Ideographic char + Variation Selector(VS17) + Variation Selector(VS1)
ExpectPrevWordBreakForCache(0, "| U+845B U+E0100 U+FE00 U+845B");
ExpectPrevWordBreakForCache(1, "| U+845B U+E0100 U+FE00 U+845B");
ExpectPrevWordBreakForCache(2, "| U+845B U+E0100 U+FE00 U+845B");
ExpectPrevWordBreakForCache(3, "| U+845B U+E0100 U+FE00 U+845B");
ExpectPrevWordBreakForCache(4, "| U+845B U+E0100 U+FE00 U+845B");
ExpectPrevWordBreakForCache(5, "U+845B U+E0100 U+FE00 | U+845B");
ExpectPrevWordBreakForCache(1000, "U+845B U+E0100 U+FE00 | U+845B");
// Tone mark. + Tone mark
ExpectPrevWordBreakForCache(0, "| U+4444 U+302D U+302D U+4444");
ExpectPrevWordBreakForCache(1, "| U+4444 U+302D U+302D U+4444");
ExpectPrevWordBreakForCache(2, "| U+4444 U+302D U+302D U+4444");
ExpectPrevWordBreakForCache(3, "| U+4444 U+302D U+302D U+4444");
ExpectPrevWordBreakForCache(4, "U+4444 U+302D U+302D | U+4444");
ExpectPrevWordBreakForCache(1000, "U+4444 U+302D U+302D | U+4444");
}
} // namespace minikin