axmol/cocos/base/ccUTF8.h

/****************************************************************************
 Copyright (c) 2014 cocos2d-x.org
 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __cocos2dx__ccUTF8__
#define __cocos2dx__ccUTF8__

#include "platform/CCPlatformMacros.h"
#include <vector>
#include <string>
#include <sstream>

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) 
#include "platform/android/jni/JniHelper.h"
#endif

NS_CC_BEGIN

namespace StringUtils {

namespace UnicodeCharacters {
    const char32_t NewLine                = 0x000A; // 10
    const char32_t CarriageReturn         = 0x000D; // 13
    const char32_t NextCharNoChangeX      = 0x0008; // 8
    const char32_t Space                  = 0x0020; // 32
    const char32_t NoBreakSpace           = 0x00A0; // 160
}

namespace AsciiCharacters {
    const char NewLine                    = '\n';
    const char CarriageReturn             = '\r';
    const char NextCharNoChangeX          = '\b';
    const char Space                      = ' ';
}

template<typename T>
std::string toString(T arg)
{
    std::stringstream ss;
    ss << arg;
    return ss.str();
}

std::string CC_DLL format(const char* format, ...) CC_FORMAT_PRINTF(1, 2);
std::string CC_DLL vformat(const char* format, va_list ap);

/**
 *  @brief Converts from UTF8 string to UTF16 string.
 *
 *  This function resizes \p outUtf16 to required size and
 *  fill its contents with result UTF16 string if conversion success.
 *  If conversion fails it guarantees not to change \p outUtf16.
 *
 *  @param inUtf8 The source UTF8 string to be converted from.
 *  @param outUtf16 The output string to hold the result UTF16s.
 *  @return True if succeed, otherwise false.
 *  @note Please check the return value before using \p outUtf16
 *  e.g.
 *  @code
 *    std::u16string utf16;
 *    bool ret = StringUtils::UTF8ToUTF16("你好hello", utf16);
 *    if (ret) {
 *        do_some_thing_with_utf16(utf16);
 *    }
 *  @endcode
 */
CC_DLL bool UTF8ToUTF16(const std::string& inUtf8, std::u16string& outUtf16);

/**
 *  @brief Same as \a UTF8ToUTF16 but converts form UTF8 to UTF32.
 *
 *  @see UTF8ToUTF16
 */
CC_DLL bool UTF8ToUTF32(const std::string& inUtf8, std::u32string& outUtf32);

/**
 *  @brief Same as \a UTF8ToUTF16 but converts form UTF16 to UTF8.
 *
 *  @see UTF8ToUTF16
 */
CC_DLL bool UTF16ToUTF8(const std::u16string& inUtf16, std::string& outUtf8);
    
/**
 *  @brief Same as \a UTF8ToUTF16 but converts form UTF16 to UTF32.
 *
 *  @see UTF8ToUTF16
 */
CC_DLL bool UTF16ToUTF32(const std::u16string& inUtf16, std::u32string& outUtf32);

/**
 *  @brief Same as \a UTF8ToUTF16 but converts form UTF32 to UTF8.
 *
 *  @see UTF8ToUTF16
 */
CC_DLL bool UTF32ToUTF8(const std::u32string& inUtf32, std::string& outUtf8);
    
/**
 *  @brief Same as \a UTF8ToUTF16 but converts form UTF32 to UTF16.
 *
 *  @see UTF8ToUTF16
 */
CC_DLL bool UTF32ToUTF16(const std::u32string& inUtf32, std::u16string& outUtf16);



#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)


/**
*  @brief convert jstring to utf8 std::string,  same function with env->getStringUTFChars. 
*         because getStringUTFChars can not pass special emoticon
*  @param env   The JNI Env
*  @param srcjStr The jstring which want to convert
*  @param ret   True if the conversion succeeds and the ret pointer isn't null
*  @returns the result of utf8 string
*/
CC_DLL std::string getStringUTFCharsJNI(JNIEnv* env, jstring srcjStr, bool* ret = nullptr);

/**
*  @brief create a jstring with utf8 std::string, same function with env->newStringUTF
*         because newStringUTF can not convert special emoticon
*  @param env   The JNI Env
*  @param srcjStr The std::string which want to convert
*  @param ret     True if the conversion succeeds and the ret pointer isn't null
*  @returns the result of jstring,the jstring need to DeleteLocalRef(jstring);
*/
CC_DLL jstring newStringUTFJNI(JNIEnv* env, const std::string& utf8Str, bool* ret = nullptr);
#endif

/**
 *  @brief Trims the unicode spaces at the end of char16_t vector.
 */
CC_DLL void trimUTF16Vector(std::vector<char16_t>& str);
    
/**
 *  @brief Trims the unicode spaces at the end of char32_t vector.
 */
CC_DLL void trimUTF32Vector(std::vector<char32_t>& str);

/**
 *  @brief Whether the character is a whitespace character.
 *  @param ch    The unicode character.
 *  @returns     Whether the character is a white space character.
 *
 *  @see http://en.wikipedia.org/wiki/Whitespace_character#Unicode
 *
 */
CC_DLL bool isUnicodeSpace(char32_t ch);

/**
 *  @brief Whether the character is a Chinese/Japanese/Korean character.
 *  @param ch    The unicode character.
 *  @returns     Whether the character is a Chinese character.
 *
 *  @see http://www.searchtb.com/2012/04/chinese_encode.html
 *  @see http://tieba.baidu.com/p/748765987
 *
 */
CC_DLL bool isCJKUnicode(char32_t ch);
    
/**
 *  @brief Whether the character is a non-breaking character.
 *  @param ch    The unicode character.
 *  @returns     Whether the character is a non-breaking character.
 *
 *  @see https://en.wikipedia.org/wiki/Space_(punctuation)#Spaces_in_Unicode
 *  @see https://en.wikipedia.org/wiki/Non-breaking_space
 *  @see https://en.wikipedia.org/wiki/Figure_space
 *  @see https://en.wikipedia.org/wiki/Word_joiner
 *
 */
CC_DLL bool isUnicodeNonBreaking(char32_t ch);
    
/**
 *  @brief Returns the length of the string in characters.
 *  @param utf8 An UTF-8 encoded string.
 *  @returns The length of the string in characters.
 */
CC_DLL long getCharacterCountInUTF8String(const std::string& utf8);

/**
 *  @brief Gets the index of the last character that is not equal to the character given.
 *  @param str   The string to be searched.
 *  @param c     The character to be searched for.
 *  @returns The index of the last character that is not \p c.
 */
CC_DLL unsigned int getIndexOfLastNotChar16(const std::vector<char16_t>& str, char16_t c);

/**
 *  @brief Gets char16_t vector from a given utf16 string.
 */
CC_DLL std::vector<char16_t> getChar16VectorFromUTF16String(const std::u16string& utf16);

/**
 *  @brief Whether has non-ascii utf-8 characters
 */
CC_DLL bool hasNonAsciiUTF8(const char* str, size_t len);

/**
 *  @brief isLegalUTF8String, contains ascii characters
 */
CC_DLL bool isLegalUTF8String(const char* str, size_t len);

/**
* Utf8 sequence
* Store all utf8 chars as std::string
* Build from std::string
*/
class CC_DLL StringUTF8
{
public:
    struct CharUTF8
    {
        std::string _char;
        bool isASCII() const { return _char.size() == 1; }
    };
    typedef std::vector<CharUTF8> CharUTF8Store;

    StringUTF8();
    StringUTF8(const std::string& newStr);
    ~StringUTF8();

    std::size_t length() const;
    void replace(const std::string& newStr);

    std::string getAsCharSequence() const;
    std::string getAsCharSequence(std::size_t pos) const;
    std::string getAsCharSequence(std::size_t pos, std::size_t len) const;

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

    CharUTF8Store& getString() { return _str; }
    const CharUTF8Store& getString() const { return _str; }

private:
    CharUTF8Store _str;
};

} // namespace StringUtils {

NS_CC_END

#endif /** defined(__cocos2dx__ccUTF8__) */