String.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
// This software owned by Onix Solutions Limited [OnixS] and is 
// protected by copyright law and international copyright treaties.
//
// Access to and use of the software is governed by the terms of the applicable 
// OnixS Software Services Agreement (the Agreement) and Customer end user license 
// agreements granting a non-assignable, non-transferable and non-exclusive license 
// to use the software for it's own data processing purposes under the terms defined 
// in the Agreement.
//
// Except as otherwise granted within the terms of the Agreement, copying or 
// reproduction of any part of this source code or associated reference material 
// to any other location for further reproduction or redistribution, and any 
// amendments to this copyright notice, are expressly prohibited.
//
// Any reproduction or redistribution for sale or hiring of the Software not in 
// accordance with the terms of the Agreement is a violation of copyright law.
//
 
#pragma once
 
#include <cstddef>
#include <cstring>
#include <string>
#include <stdexcept>
 
#include <algorithm>
#include <ostream>
 
#include <OnixS/eSpeed/MarketData/Itch/Bootstrap.h>
#include <OnixS/eSpeed/MarketData/Itch/Compiler.h>
 
ONIXS_ESPEED_ITCH_NAMESPACE_BEGIN

typedef char Char;

class StrRef
{
public:
    typedef const Char* Iterator;

    ONIXS_ESPEED_ITCH_CONSTEXPR
    StrRef()
    ONIXS_ESPEED_ITCH_NOTHROW
        : items_(ONIXS_ESPEED_ITCH_NULLPTR)
        , size_(0)
    {
    }

    StrRef(
        const Char* chars,
        size_t size)
    ONIXS_ESPEED_ITCH_NOTHROW
        : items_(chars)
        , size_(size)
    {
    }

    template <size_t Size>
    explicit
    ONIXS_ESPEED_ITCH_CONSTEXPR
    StrRef(const char (&value)[Size])
    ONIXS_ESPEED_ITCH_NOTHROW
        : items_(value)
        , size_(Size - 1)
    {
    }

    explicit
    StrRef(
        const std::string& string)
    ONIXS_ESPEED_ITCH_NOTHROW
        : items_(string.c_str())
        , size_(string.size())
    {
    }

    StrRef(
        const StrRef& other)
    ONIXS_ESPEED_ITCH_NOTHROW
        : items_(other.items_)
        , size_(other.size_)
    {
    }
 
#if defined(ONIXS_ESPEED_ITCH_COMPILER_CXX_RVALUE_REFERENCES) && ONIXS_ESPEED_ITCH_COMPILER_CXX_RVALUE_REFERENCES
 
    ONIXS_ESPEED_ITCH_CONSTEXPR
    StrRef(
        StrRef&& other)
    ONIXS_ESPEED_ITCH_NOTHROW
        : items_(std::move(other.items_))
        , size_(std::move(other.size_))
    {
    }
 
    StrRef& operator= (StrRef&& other)
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        if (this == &other)
            return *this;
 
        items_ = std::move(other.items_);
        size_ = std::move(other.size_);
 
        return *this;
    }
 
#endif

    bool empty() const
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        return (0 == size_);
    }

    const Char* items() const
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        return items_;
    }

    size_t size() const
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        return size_;
    }

    Iterator begin() const
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        return items_;
    }

    Iterator end() const
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        return (items_ + size_);
    }

    void reset()
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        reset(ONIXS_ESPEED_ITCH_NULLPTR, 0);
    }

    void
    reset(
        const Char* chars,
        size_t size)
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        items_ = chars;
        size_ = size;
    }
 
    const Char&
    operator [](
        size_t index) const
    {
        return items_[index];
    }
 
    const Char&
    at(
        size_t index) const
    {
        if (index < size_)
            return items_[index];
 
        throw std::invalid_argument("index");
    }

    StrRef&
    operator =(
        const StrRef& other)
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        items_ = other.items_;
        size_ = other.size_;
 
        return *this;
    }

    void
    swap(
        StrRef& other)
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        std::swap(items_, other.items_);
        std::swap(size_, other.size_);
    }
 
    // Get trimmed presentation of the current string
    StrRef trim() const
    ONIXS_ESPEED_ITCH_NOTHROW
    {
        size_t length = size();
 
        while(length > 0 && isspace(operator[](length - 1)))
            --length;
 
        return StrRef(items(), length);
    }
 
private:
    const Char* items_;

    size_t size_;
};

inline
    StrRef
    toStrRef(
        const std::string& str)
{
    return StrRef(str.data(), str.size());
}

inline
    StrRef
    toStrRef(
        const Char* cStr)
{
    return
        StrRef(
            cStr,
            cStr
            ? strlen(cStr)
            : 0
        );
}

inline
    std::string
    toStr(
        const StrRef& ref)
{
    return std::string(ref.items(), ref.size());
}

inline
    void
    toStr(
        std::string& str,
        const StrRef& ref)
{
    str.append(ref.items(), ref.size());
}

inline
    std::string
    toStr(
        Char character)
{
    return std::string(1, character);
}

inline
    void
    toStr(
        std::string& str,
        Char character)
{
    str.append(1, character);
}

inline
    void
    toStr(
        std::string& str,
        const std::string& value)
{
    str.append(value);
}

inline
    bool
    operator ==(
        const StrRef& left,
        const StrRef& right)
{
    return (
        left.size() == right.size()
        &&
        0 == memcmp(
            left.items(), right.items(), left.size()));
}

inline
    bool
    operator !=(
        const StrRef& left,
        const StrRef& right)
{
    return !(left == right);
}

inline
    bool
    operator ==(
        const StrRef& ref,
        const std::string& str)
{
    return ref == toStrRef(str);
}

inline
    bool
    operator !=(
        const StrRef& ref,
        const std::string& str)
{
    return ref != toStrRef(str);
}

inline
    bool
    operator ==(
        const std::string& str,
        const StrRef& ref)
{
    return ref == toStrRef(str);
}

inline
    bool
    operator !=(
        const std::string& str,
        const StrRef& ref)
{
    return ref != toStrRef(str);
}

inline
    bool
    operator ==(
        const StrRef& ref,
        const Char* str)
{
    return ref == toStrRef(str);
}

inline
    bool
    operator !=(
        const StrRef& ref,
        const Char* str)
{
    return ref != toStrRef(str);
}

inline
    bool
    operator ==(
        const Char* str,
        const StrRef& ref)
{
    return ref == toStrRef(str);
}

inline
    bool
    operator !=(
        const Char* str,
        const StrRef& ref)
{
    return ref != toStrRef(str);
}

inline
    bool
    operator <(
        const StrRef& left,
        const StrRef& right)
{
    ptrdiff_t
        compareResult =
        memcmp(
            left.items(),
            right.items(),
            left.size() < right.size()
            ? left.size()
            : right.size());
 
    if (0 == compareResult)
    {
        compareResult =
            static_cast<ptrdiff_t>(
                left.size() - right.size());
    }
 
    return (0 > compareResult);
}

inline
    bool
    operator >(
        const StrRef& left,
        const StrRef& right)
{
    return (right < left);
}

inline
    std::ostream&
    operator <<(
        std::ostream& stream,
        const StrRef& text)
{
    stream.write(text.items(), text.size());
 
    return stream;
}
 
ONIXS_ESPEED_ITCH_NAMESPACE_END