String.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
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// protected by copyright law and international copyright treaties.
//
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// agreements granting a non-assignable, non-transferable and non-exclusive license 
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// 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.
//
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// 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/CME/Streamlined/Bootstrap.h>
 
ONIXS_CMESTREAMLINEDMDH_NAMESPACE_BEGIN

typedef char Char;

ONIXS_CMESTREAMLINEDMDH_LTWT_CLASS StrRef
{
public:
    typedef const Char* Iterator;

    StrRef()
        : items_(0)
        , size_(0)
    {
    }

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

    StrRef(
        const StrRef& other)
        : items_(other.items_)
        , size_(other.size_)
    {
    }

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

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

    size_t size() const
    {
        return size_;
    }

    Iterator begin() const
    {
        return items_;
    }

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

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

    void
    reset(
        const Char* chars,
        size_t size)
    {
        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)
    {
        items_ = other.items_;
        size_ = other.size_;
 
        return *this;
    }

    void
    swap(
        StrRef& other)
    {
        std::swap(items_, other.items_);
        std::swap(size_, other.size_);
    }
 
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_CMESTREAMLINEDMDH_NAMESPACE_END