CharacterProperties.h   [plain text]

/*
 * Copyright (C) 2015 Apple, 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
 */

#pragma once

#include <unicode/uchar.h>

namespace WebCore {

#define ICU_HEADERS_UNDERSTAND_SUPPLEMENTAL_SYMBOLS_AND_PICTOGRAPHS (U_ICU_VERSION_MAJOR_NUM > 56 || (U_ICU_VERSION_MAJOR_NUM == 56 && U_ICU_VERSION_MINOR_NUM >= 1))

#if ICU_HEADERS_UNDERSTAND_SUPPLEMENTAL_SYMBOLS_AND_PICTOGRAPHS
static bool icuLibraryUnderstandsSupplementalSymbolsAndPictographs()
{
    UVersionInfo versionInfo;
    u_getVersion(versionInfo);
    static_assert(U_MAX_VERSION_LENGTH >= 2, "Cannot run ICU version check");
    return versionInfo[0] > 56 || (versionInfo[0] == 56 && versionInfo[1] >= 1);
}
#endif

static inline bool isEmojiGroupCandidate(UChar32 character)
{
    auto unicodeBlock = ublock_getCode(character);

    if (unicodeBlock == UBLOCK_MISCELLANEOUS_SYMBOLS
        || unicodeBlock == UBLOCK_DINGBATS
        || unicodeBlock == UBLOCK_MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS
        || unicodeBlock == UBLOCK_EMOTICONS
        || unicodeBlock == UBLOCK_TRANSPORT_AND_MAP_SYMBOLS)
        return true;

#if ICU_HEADERS_UNDERSTAND_SUPPLEMENTAL_SYMBOLS_AND_PICTOGRAPHS
    static bool useSupplementalSymbolsAndPictographs = icuLibraryUnderstandsSupplementalSymbolsAndPictographs();
    if (useSupplementalSymbolsAndPictographs)
        return unicodeBlock == UBLOCK_SUPPLEMENTAL_SYMBOLS_AND_PICTOGRAPHS;
#endif
    return character >= 0x1F900 && character <= 0x1F9FF;
}

static inline bool isEmojiFitzpatrickModifier(UChar32 character)
{
    // U+1F3FB - EMOJI MODIFIER FITZPATRICK TYPE-1-2
    // U+1F3FC - EMOJI MODIFIER FITZPATRICK TYPE-3
    // U+1F3FD - EMOJI MODIFIER FITZPATRICK TYPE-4
    // U+1F3FE - EMOJI MODIFIER FITZPATRICK TYPE-5
    // U+1F3FF - EMOJI MODIFIER FITZPATRICK TYPE-6

    return character >= 0x1F3FB && character <= 0x1F3FF;
}

inline bool isVariationSelector(UChar32 character)
{
    return character >= 0xFE00 && character <= 0xFE0F;
}

inline bool isEmojiKeycapBase(UChar32 character)
{
    return (character >= '0' && character <= '9') || character == '#' || character == '*';
}

inline bool isEmojiRegionalIndicator(UChar32 character)
{
    return character >= 0x1F1E6 && character <= 0x1F1FF;
}

inline bool isEmojiWithPresentationByDefault(UChar32 character)
{
#if U_ICU_VERSION_MAJOR_NUM >= 57
    return u_hasBinaryProperty(character, UCHAR_EMOJI_PRESENTATION);
#else
    UNUSED_PARAM(character);
    return false;
#endif
}

inline bool isEmojiModifierBase(UChar32 character)
{
#if U_ICU_VERSION_MAJOR_NUM >= 57
    return u_hasBinaryProperty(character, UCHAR_EMOJI_MODIFIER_BASE);
#else
    UNUSED_PARAM(character);
    return false;
#endif
}

inline bool isDefaultIgnorableCodePoint(UChar32 character)
{
    return u_hasBinaryProperty(character, UCHAR_DEFAULT_IGNORABLE_CODE_POINT);
}

inline bool isControlCharacter(UChar32 character)
{
    return u_getIntPropertyValue(character, UCHAR_GENERAL_CATEGORY) == U_CONTROL_CHAR;
}

}