ClickHouse/base/poco/Foundation/include/Poco/UTF8String.h

//
// UTF8String.h
//
// Library: Foundation
// Package: Text
// Module:  UTF8String
//
// Definition of the UTF8 string functions.
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_UTF8String_INCLUDED
#define Foundation_UTF8String_INCLUDED


#include "Poco/Foundation.h"


namespace Poco
{


struct Foundation_API UTF8
/// This class provides static methods that are UTF-8 capable variants
/// of the same functions in Poco/String.h.
///
/// The various variants of icompare() provide case insensitive comparison
/// for UTF-8 encoded strings.
///
/// toUpper(), toUpperInPlace(), toLower() and toLowerInPlace() provide
/// Unicode-based character case transformation for UTF-8 encoded strings.
///
/// removeBOM() removes the UTF-8 Byte Order Mark sequence (0xEF, 0xBB, 0xBF)
/// from the beginning of the given string, if it's there.
{
    static int icompare(
        const std::string & str,
        std::string::size_type pos,
        std::string::size_type n,
        std::string::const_iterator it2,
        std::string::const_iterator end2);
    static int icompare(const std::string & str1, const std::string & str2);
    static int icompare(const std::string & str1, std::string::size_type n1, const std::string & str2, std::string::size_type n2);
    static int icompare(const std::string & str1, std::string::size_type n, const std::string & str2);
    static int icompare(const std::string & str1, std::string::size_type pos, std::string::size_type n, const std::string & str2);
    static int icompare(
        const std::string & str1,
        std::string::size_type pos1,
        std::string::size_type n1,
        const std::string & str2,
        std::string::size_type pos2,
        std::string::size_type n2);
    static int icompare(
        const std::string & str1,
        std::string::size_type pos1,
        std::string::size_type n,
        const std::string & str2,
        std::string::size_type pos2);
    static int icompare(const std::string & str, std::string::size_type pos, std::string::size_type n, const std::string::value_type * ptr);
    static int icompare(const std::string & str, std::string::size_type pos, const std::string::value_type * ptr);
    static int icompare(const std::string & str, const std::string::value_type * ptr);

    static std::string toUpper(const std::string & str);
    static std::string & toUpperInPlace(std::string & str);
    static std::string toLower(const std::string & str);
    static std::string & toLowerInPlace(std::string & str);

    static void removeBOM(std::string & str);
    /// Remove the UTF-8 Byte Order Mark sequence (0xEF, 0xBB, 0xBF)
    /// from the beginning of the string, if it's there.

    static std::string escape(const std::string & s, bool strictJSON = false);
    /// Escapes a string. Special characters like tab, backslash, ... are
    /// escaped. Unicode characters are escaped to \uxxxx.
    /// If strictJSON is true, \a and \v will be escaped to \\u0007 and \\u000B
    /// instead of \\a and \\v for strict JSON conformance.

    static std::string escape(const std::string::const_iterator & begin, const std::string::const_iterator & end, bool strictJSON = false);
    /// Escapes a string. Special characters like tab, backslash, ... are
    /// escaped. Unicode characters are escaped to \uxxxx.
    /// If strictJSON is true, \a and \v will be escaped to \\u0007 and \\u000B
    /// instead of \\a and \\v for strict JSON conformance.

    static std::string unescape(const std::string & s);
    /// Creates an UTF8 string from a string that contains escaped characters.

    static std::string unescape(const std::string::const_iterator & begin, const std::string::const_iterator & end);
    /// Creates an UTF8 string from a string that contains escaped characters.
};


} // namespace Poco


#endif // Foundation_UTF8String_INCLUDED