word_boundaries.cpp

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// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
 
#include "include/core/SkTypes.h"
#include "modules/skplaintexteditor/src/word_boundaries.h"
#include "modules/skunicode/include/SkUnicode.h"
#include <memory>
 
#if defined(SK_UNICODE_ICU_IMPLEMENTATION)
#include "modules/skunicode/include/SkUnicode_icu.h"
#endif
 
#if defined(SK_UNICODE_LIBGRAPHEME_IMPLEMENTATION)
#include "modules/skunicode/include/SkUnicode_libgrapheme.h"
#endif
 
#if defined(SK_UNICODE_ICU4X_IMPLEMENTATION)
#include "modules/skunicode/include/SkUnicode_icu4x.h"
#endif
 
namespace {
sk_sp<SkUnicode> get_unicode() {
#if defined(SK_UNICODE_ICU_IMPLEMENTATION)
    if (auto unicode = SkUnicodes::ICU::Make()) {
        return unicode;
    }
#endif  // defined(SK_UNICODE_ICU_IMPLEMENTATION)
#if defined(SK_UNICODE_LIBGRAPHEME_IMPLEMENTATION)
    if (auto unicode = SkUnicodes::Libgrapheme::Make()) {
        return unicode;
    }
#endif
#if defined(SK_UNICODE_ICU4X_IMPLEMENTATION)
    if (auto unicode = SkUnicodes::ICU4X::Make()) {
        return unicode;
    }
#endif
    SkDEBUGFAIL("Cannot make SkUnicode");
    return nullptr;
}
}
 
std::vector<bool> GetUtf8WordBoundaries(const char* begin, size_t byteCount, const char* locale) {
    auto unicode = get_unicode();
    if (nullptr == unicode) {
        return {};
    }
    std::vector<SkUnicode::Position> positions;
    if (!unicode->getWords(begin, byteCount, locale, &positions) || byteCount == 0) {
        return {};
    }
    std::vector<bool> result;
    result.resize(byteCount);
    for (auto& pos : positions) {
        result[pos] = true;
    }
    return result;
}