axmol/cocos/base/ccUTF8.cpp

/****************************************************************************
 Copyright (c) 2014 cocos2d-x.org
 Copyright (c) 2014 Chukong Technologies Inc.

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 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "base/ccUTF8.h"
#include "platform/CCCommon.h"
#include "base/CCConsole.h"
#include "ConvertUTF.h"

NS_CC_BEGIN

namespace StringUtils {

/*
 * @str:    the string to search through.
 * @c:        the character to not look for.
 *
 * Return value: the index of the last character that is not c.
 * */
unsigned int getIndexOfLastNotChar16(const std::vector<char16_t>& str, char16_t c)
{
    int len = static_cast<int>(str.size());

    int i = len - 1;
    for (; i >= 0; --i)
        if (str[i] != c) return i;

    return i;
}

/*
 * @str:    the string to trim
 * @index:    the index to start trimming from.
 *
 * Trims str st str=[0, index) after the operation.
 *
 * Return value: the trimmed string.
 * */
static void trimUTF16VectorFromIndex(std::vector<char16_t>& str, int index)
{
    int size = static_cast<int>(str.size());
    if (index >= size || index < 0)
        return;

    str.erase(str.begin() + index, str.begin() + size);
}

/*
 * @ch is the unicode character whitespace?
 *
 * Reference: http://en.wikipedia.org/wiki/Whitespace_character#Unicode
 *
 * Return value: weather the character is a whitespace character.
 * */
bool isUnicodeSpace(char16_t ch)
{
    return  (ch >= 0x0009 && ch <= 0x000D) || ch == 0x0020 || ch == 0x0085 || ch == 0x00A0 || ch == 0x1680
    || (ch >= 0x2000 && ch <= 0x200A) || ch == 0x2028 || ch == 0x2029 || ch == 0x202F
    ||  ch == 0x205F || ch == 0x3000;
}

bool isCJKUnicode(char16_t ch)
{
    return (ch >= 0x4E00 && ch <= 0x9FBF)   // CJK Unified Ideographs
        || (ch >= 0x2E80 && ch <= 0x2FDF)   // CJK Radicals Supplement & Kangxi Radicals
        || (ch >= 0x2FF0 && ch <= 0x30FF)   // Ideographic Description Characters, CJK Symbols and Punctuation & Japanese
        || (ch >= 0x3100 && ch <= 0x31BF)   // Korean
        || (ch >= 0xAC00 && ch <= 0xD7AF)   // Hangul Syllables
        || (ch >= 0xF900 && ch <= 0xFAFF)   // CJK Compatibility Ideographs
        || (ch >= 0xFE30 && ch <= 0xFE4F)   // CJK Compatibility Forms
        || (ch >= 0x31C0 && ch <= 0x4DFF);  // Other extensions
}

void trimUTF16Vector(std::vector<char16_t>& str)
{
    int len = static_cast<int>(str.size());

    if ( len <= 0 )
        return;

    int last_index = len - 1;

    // Only start trimming if the last character is whitespace..
    if (isUnicodeSpace(str[last_index]))
    {
        for (int i = last_index - 1; i >= 0; --i)
        {
            if (isUnicodeSpace(str[i]))
                last_index = i;
            else
                break;
        }

        trimUTF16VectorFromIndex(str, last_index);
    }
}


template <typename T>
struct ConvertTrait {
    typedef T ArgType;
};
template <>
struct ConvertTrait<char> {
    typedef UTF8 ArgType;
};
template <>
struct ConvertTrait<char16_t> {
    typedef UTF16 ArgType;
};
template <>
struct ConvertTrait<char32_t> {
    typedef UTF32 ArgType;
};

template <typename From, typename To, typename FromTrait = ConvertTrait<From>, typename ToTrait = ConvertTrait<To>>
bool utfConvert(
    const std::basic_string<From>& from, std::basic_string<To>& to,
    ConversionResult(*cvtfunc)(const typename FromTrait::ArgType**, const typename FromTrait::ArgType*,
        typename ToTrait::ArgType**, typename ToTrait::ArgType*,
        ConversionFlags)
    )
{
    static_assert(sizeof(From) == sizeof(typename FromTrait::ArgType), "Error size mismatched");
    static_assert(sizeof(To) == sizeof(typename ToTrait::ArgType), "Error size mismatched");

    if (from.empty())
    {
        to.clear();
        return true;
    }

    // See: http://unicode.org/faq/utf_bom.html#gen6
    static const int most_bytes_per_character = 4;

    const size_t maxNumberOfChars = from.length(); // all UTFs at most one element represents one character.
    const size_t numberOfOut = maxNumberOfChars * most_bytes_per_character / sizeof(To);

    std::basic_string<To> working(numberOfOut, 0);

    auto inbeg = reinterpret_cast<const typename FromTrait::ArgType*>(&from[0]);
    auto inend = inbeg + from.length();


    auto outbeg = reinterpret_cast<typename ToTrait::ArgType*>(&working[0]);
    auto outend = outbeg + working.length();
    auto r = cvtfunc(&inbeg, inend, &outbeg, outend, strictConversion);
    if (r != conversionOK)
        return false;

    working.resize(reinterpret_cast<To*>(outbeg) - &working[0]);
    to = std::move(working);

    return true;
};


bool UTF8ToUTF16(const std::string& utf8, std::u16string& outUtf16)
{
    return utfConvert(utf8, outUtf16, ConvertUTF8toUTF16);
}

bool UTF8ToUTF32(const std::string& utf8, std::u32string& outUtf32)
{
    return utfConvert(utf8, outUtf32, ConvertUTF8toUTF32);
}

bool UTF16ToUTF8(const std::u16string& utf16, std::string& outUtf8)
{
    return utfConvert(utf16, outUtf8, ConvertUTF16toUTF8);
}
    
bool UTF16ToUTF32(const std::u16string& utf16, std::u32string& outUtf32)
{
    return utfConvert(utf16, outUtf32, ConvertUTF16toUTF32);
}

bool UTF32ToUTF8(const std::u32string& utf32, std::string& outUtf8)
{
    return utfConvert(utf32, outUtf8, ConvertUTF32toUTF8);
}

bool UTF32ToUTF16(const std::u32string& utf32, std::u16string& outUtf16)
{
    return utfConvert(utf32, outUtf16, ConvertUTF32toUTF16);
}

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) 
std::string getStringUTFCharsJNI(JNIEnv* env, jstring srcjStr, bool* ret)
{
    std::string utf8Str;
    const unsigned short * unicodeChar = ( const unsigned short *)env->GetStringChars(srcjStr, nullptr);
    size_t unicodeCharLength = env->GetStringLength(srcjStr);
    const std::u16string unicodeStr((const char16_t *)unicodeChar, unicodeCharLength);
    bool flag = UTF16ToUTF8(unicodeStr, utf8Str);

    if (ret)
    {
        *ret = flag;
    }

    if (!flag)
    {
        utf8Str = "";
    }
    env->ReleaseStringChars(srcjStr, unicodeChar);
    return utf8Str;
}

jstring newStringUTFJNI(JNIEnv* env, std::string utf8Str, bool* ret)
{
    std::u16string utf16Str;
    bool flag = cocos2d::StringUtils::UTF8ToUTF16(utf8Str, utf16Str);

    if (ret)
    {
        *ret = flag;
    }

    if(!flag)
    {
        utf16Str.clear();
    }
    jstring stringText = env->NewString((const jchar*)utf16Str.data(), utf16Str.length());
    return stringText;
}
#endif

std::vector<char16_t> getChar16VectorFromUTF16String(const std::u16string& utf16)
{
    return std::vector<char16_t>(utf16.begin(), utf16.end());
}

long getCharacterCountInUTF8String(const std::string& utf8)
{
    return getUTF8StringLength((const UTF8*)utf8.c_str());
}


StringUTF8::StringUTF8()
{

}

StringUTF8::StringUTF8(const std::string& newStr)
{
    replace(newStr);
}

StringUTF8::~StringUTF8()
{

}

std::size_t StringUTF8::length() const
{
    return _str.size();
}

void StringUTF8::replace(const std::string& newStr)
{
    _str.clear();
    if (!newStr.empty())
    {
        UTF8* sequenceUtf8 = (UTF8*)newStr.c_str();

        int lengthString = getUTF8StringLength(sequenceUtf8);

        if (lengthString == 0)
        {
            CCLOG("Bad utf-8 set string: %s", newStr.c_str());
            return;
        }

        while (*sequenceUtf8)
        {
            std::size_t lengthChar = getNumBytesForUTF8(*sequenceUtf8);

            CharUTF8 charUTF8;
            charUTF8._char.append((char*)sequenceUtf8, lengthChar);
            sequenceUtf8 += lengthChar;

            _str.push_back(charUTF8);
        }
    }
}

std::string StringUTF8::getAsCharSequence() const
{
    std::string charSequence;

    for (auto& charUtf8 : _str)
    {
        charSequence.append(charUtf8._char);
    }

    return charSequence;
}

bool StringUTF8::deleteChar(std::size_t pos)
{
    if (pos < _str.size())
    {
        _str.erase(_str.begin() + pos);
        return true;
    }
    else
    {
        return false;
    }
}

bool StringUTF8::insert(std::size_t pos, const std::string& insertStr)
{
    StringUTF8 utf8(insertStr);

    return insert(pos, utf8);
}

bool StringUTF8::insert(std::size_t pos, const StringUTF8& insertStr)
{
    if (pos <= _str.size())
    {
        _str.insert(_str.begin() + pos, insertStr._str.begin(), insertStr._str.end());

        return true;
    }
    else
    {
        return false;
    }
}

} //namespace StringUtils {


int cc_wcslen(const unsigned short* str)
{
    if (str == nullptr)
        return -1;
    int i=0;
    while(*str++) i++;
    return i;
}

void cc_utf8_trim_ws(std::vector<unsigned short>* str)
{
    if (str == nullptr)
        return;
    // unsigned short and char16_t are both 2 bytes
    std::vector<char16_t>* ret = reinterpret_cast<std::vector<char16_t>*>(str);
    StringUtils::trimUTF16Vector(*ret);
}

bool isspace_unicode(unsigned short ch)
{
    return StringUtils::isUnicodeSpace(ch);
}


bool iscjk_unicode(unsigned short ch)
{
    return StringUtils::isCJKUnicode(ch);
}


long cc_utf8_strlen (const char * p, int max)
{
    CC_UNUSED_PARAM(max);
    if (p == nullptr)
        return -1;
    return StringUtils::getCharacterCountInUTF8String(p);
}

unsigned int cc_utf8_find_last_not_char(const std::vector<unsigned short>& str, unsigned short c)
{
    std::vector<char16_t> char16Vector;
    for (const auto& e : str)
    {
        char16Vector.push_back(e);
    }
    
    return StringUtils::getIndexOfLastNotChar16(char16Vector, c);
}

std::vector<unsigned short> cc_utf16_vec_from_utf16_str(const unsigned short* str)
{
    std::vector<unsigned short> str_new;
    
    if (str == nullptr)
        return str_new;
    
    int len = cc_wcslen(str);
    
    for (int i = 0; i < len; ++i)
    {
        str_new.push_back(str[i]);
    }
    return str_new;
}

unsigned short* cc_utf8_to_utf16(const char* str_old, int length/* = -1*/, int* rUtf16Size/* = nullptr*/)
{
    if (str_old == nullptr)
        return nullptr;
    
    unsigned short* ret = nullptr;
    
    std::u16string outUtf16;
    bool succeed = StringUtils::UTF8ToUTF16(str_old, outUtf16);
    
    if (succeed)
    {
        ret = new (std::nothrow) unsigned short[outUtf16.length() + 1];
        ret[outUtf16.length()] = 0;
        memcpy(ret, outUtf16.data(), outUtf16.length() * sizeof(unsigned short));
        if (rUtf16Size)
        {
            *rUtf16Size = static_cast<int>(outUtf16.length());
        }
    }
    
    return ret;
}

char * cc_utf16_to_utf8 (const unsigned short  *str,
                  int             len,
                  long            *items_read,
                  long            *items_written)
{
    if (str == nullptr)
        return nullptr;
    
    
    std::u16string utf16;
    int utf16Len = len < 0 ? cc_wcslen(str) : len;
    
    for (int i = 0; i < utf16Len; ++i)
    {
        utf16.push_back(str[i]);
    }
    
    char* ret = nullptr;
    std::string outUtf8;
    bool succeed = StringUtils::UTF16ToUTF8(utf16, outUtf8);
    
    if (succeed)
    {
        ret = new (std::nothrow) char[outUtf8.length() + 1];
        ret[outUtf8.length()] = '\0';
        memcpy(ret, outUtf8.data(), outUtf8.length());
    }
    
    return ret;
}


NS_CC_END