HyphenatorTest.cpp

/*
 * Copyright (C) 2017 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 <minikin/Hyphenator.h>
#include "FileUtils.h"
#include "ICUTestBase.h"

#ifndef NELEM
#define NELEM(x) ((sizeof(x) / sizeof((x)[0])))
#endif

namespace minikin {

const char* usHyph = "/system/usr/hyphen-data/hyph-en-us.hyb";
const char* malayalamHyph = "/system/usr/hyphen-data/hyph-ml.hyb";

typedef ICUTestBase HyphenatorTest;

const icu::Locale catalanLocale("ca", "ES", nullptr, nullptr);
const icu::Locale polishLocale("pl", "PL", nullptr, nullptr);
const icu::Locale& usLocale = icu::Locale::getUS();

const uint16_t HYPHEN_MINUS = 0x002D;
const uint16_t SOFT_HYPHEN = 0x00AD;
const uint16_t MIDDLE_DOT = 0x00B7;
const uint16_t GREEK_LOWER_ALPHA = 0x03B1;
const uint16_t ARMENIAN_AYB = 0x0531;
const uint16_t HEBREW_ALEF = 0x05D0;
const uint16_t ARABIC_ALEF = 0x0627;
const uint16_t ARABIC_BEH = 0x0628;
const uint16_t ARABIC_ZWARAKAY = 0x0659;
const uint16_t MALAYALAM_KA = 0x0D15;
const uint16_t UCAS_E = 0x1401;
const uint16_t HYPHEN = 0x2010;
const uint16_t EN_DASH = 0x2013;

// Simple test for US English. This tests "table", which happens to be the in
// the exceptions list.
TEST_F(HyphenatorTest, usEnglishAutomaticHyphenation) {
  Hyphenator* hyphenator =
      Hyphenator::loadBinary(readWholeFile(usHyph).data(), 2, 3);
  const uint16_t word[] = {'t', 'a', 'b', 'l', 'e'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)5, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN, result[2]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[3]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[4]);
}

// Catalan l·l should break as l-/l
TEST_F(HyphenatorTest, catalanMiddleDot) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'l', 'l', MIDDLE_DOT, 'l', 'l'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), catalanLocale);
  EXPECT_EQ((size_t)5, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[2]);
  EXPECT_EQ(HyphenationType::BREAK_AND_REPLACE_WITH_HYPHEN, result[3]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[4]);
}

// Catalan l·l should not break if the word is too short.
TEST_F(HyphenatorTest, catalanMiddleDotShortWord) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'l', MIDDLE_DOT, 'l'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), catalanLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[2]);
}

// If we break on a hyphen in Polish, the hyphen should be repeated on the next
// line.
TEST_F(HyphenatorTest, polishHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'x', HYPHEN, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), polishLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN_AT_NEXT_LINE, result[2]);
}

// If the language is Polish but the script is not Latin, don't use Polish rules
// for hyphenation.
TEST_F(HyphenatorTest, polishHyphenButNonLatinWord) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {GREEK_LOWER_ALPHA, HYPHEN, GREEK_LOWER_ALPHA};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), polishLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[2]);
}

// Polish en dash doesn't repeat on next line (as far as we know), but just
// provides a break opportunity.
TEST_F(HyphenatorTest, polishEnDash) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'x', EN_DASH, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), polishLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[2]);
}

// In Latin script text, soft hyphens should insert a visible hyphen if broken
// at.
TEST_F(HyphenatorTest, latinSoftHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'x', SOFT_HYPHEN, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN, result[2]);
}

// Soft hyphens at the beginning of a word are not useful in linebreaking.
TEST_F(HyphenatorTest, latinSoftHyphenStartingTheWord) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {SOFT_HYPHEN, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)2, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
}

// In Malayalam script text, soft hyphens should not insert a visible hyphen if
// broken at.
TEST_F(HyphenatorTest, malayalamSoftHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {MALAYALAM_KA, SOFT_HYPHEN, MALAYALAM_KA};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[2]);
}

// In automatically hyphenated Malayalam script text, we should not insert a
// visible hyphen.
TEST_F(HyphenatorTest, malayalamAutomaticHyphenation) {
  Hyphenator* hyphenator =
      Hyphenator::loadBinary(readWholeFile(malayalamHyph).data(), 2, 2);
  const uint16_t word[] = {MALAYALAM_KA, MALAYALAM_KA, MALAYALAM_KA,
                           MALAYALAM_KA, MALAYALAM_KA};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)5, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[2]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[3]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[4]);
}

// In Armenian script text, soft hyphens should insert an Armenian hyphen if
// broken at.
TEST_F(HyphenatorTest, aremenianSoftHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {ARMENIAN_AYB, SOFT_HYPHEN, ARMENIAN_AYB};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_ARMENIAN_HYPHEN, result[2]);
}

// In Hebrew script text, soft hyphens should insert a normal hyphen if broken
// at, for now. We may need to change this to maqaf later.
TEST_F(HyphenatorTest, hebrewSoftHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {HEBREW_ALEF, SOFT_HYPHEN, HEBREW_ALEF};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN, result[2]);
}

// Soft hyphen between two Arabic letters that join should keep the joining
// behavior when broken across lines.
TEST_F(HyphenatorTest, arabicSoftHyphenConnecting) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {ARABIC_BEH, SOFT_HYPHEN, ARABIC_BEH};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN_AND_ZWJ, result[2]);
}

// Arabic letters may be joining on one side, but if it's the wrong side, we
// should use the normal hyphen.
TEST_F(HyphenatorTest, arabicSoftHyphenNonConnecting) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {ARABIC_ALEF, SOFT_HYPHEN, ARABIC_BEH};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN, result[2]);
}

// Skip transparent characters until you find a non-transparent one.
TEST_F(HyphenatorTest, arabicSoftHyphenSkipTransparents) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {ARABIC_BEH, ARABIC_ZWARAKAY, SOFT_HYPHEN,
                           ARABIC_ZWARAKAY, ARABIC_BEH};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)5, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[2]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN_AND_ZWJ, result[3]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[4]);
}

// Skip transparent characters until you find a non-transparent one. If we get
// to one end without finding anything, we are still non-joining.
TEST_F(HyphenatorTest, arabicSoftHyphenTransparentsAtEnd) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {ARABIC_BEH, ARABIC_ZWARAKAY, SOFT_HYPHEN,
                           ARABIC_ZWARAKAY};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)4, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[2]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN, result[3]);
}

// Skip transparent characters until you find a non-transparent one. If we get
// to one end without finding anything, we are still non-joining.
TEST_F(HyphenatorTest, arabicSoftHyphenTransparentsAtStart) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {ARABIC_ZWARAKAY, SOFT_HYPHEN, ARABIC_ZWARAKAY,
                           ARABIC_BEH};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)4, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_HYPHEN, result[2]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[3]);
}

// In Unified Canadian Aboriginal script (UCAS) text, soft hyphens should insert
// a UCAS hyphen.
TEST_F(HyphenatorTest, ucasSoftHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {UCAS_E, SOFT_HYPHEN, UCAS_E};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_UCAS_HYPHEN, result[2]);
}

// Presently, soft hyphen looks at the character after it to determine
// hyphenation type. This is a little arbitrary, but let's test it anyway.
TEST_F(HyphenatorTest, mixedScriptSoftHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'a', SOFT_HYPHEN, UCAS_E};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_INSERT_UCAS_HYPHEN, result[2]);
}

// Hard hyphens provide a breaking opportunity with nothing extra inserted.
TEST_F(HyphenatorTest, hardHyphen) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'x', HYPHEN, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[2]);
}

// Hyphen-minuses also provide a breaking opportunity with nothing extra
// inserted.
TEST_F(HyphenatorTest, hyphenMinus) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {'x', HYPHEN_MINUS, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)3, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
  EXPECT_EQ(HyphenationType::BREAK_AND_DONT_INSERT_HYPHEN, result[2]);
}

// If the word starts with a hard hyphen or hyphen-minus, it doesn't make sense
// to break it at that point.
TEST_F(HyphenatorTest, startingHyphenMinus) {
  Hyphenator* hyphenator = Hyphenator::loadBinary(nullptr, 2, 2);
  const uint16_t word[] = {HYPHEN_MINUS, 'y'};
  std::vector<HyphenationType> result;
  hyphenator->hyphenate(&result, word, NELEM(word), usLocale);
  EXPECT_EQ((size_t)2, result.size());
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[0]);
  EXPECT_EQ(HyphenationType::DONT_BREAK, result[1]);
}

}  // namespace minikin