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
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// 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 "OnixS/CME/DropCopy/Export.h"
#include "OnixS/CME/DropCopy/Numeric.h"
 
#include <cstring>
#include <functional>
#include <ostream>
#include <stdexcept>
#include <string>
 
namespace OnixS { namespace CME { namespace DropCopy {
 
class StringRef;

class ONIXS_CME_DROP_COPY_EXPORT String
{
public:
    typedef char* iterator;

    typedef const char* ConstIterator;

    String();

    String(const String& other);

    explicit String(const StringRef& strRef);

    explicit String(const std::string& stdStr);

    explicit String(const char* cStr);

    String(const char* text, size_t textSize);

    ~String();

    bool empty() const;

    size_t size() const;

    size_t capacity() const;

    const char* data() const;

    const char* c_str() const;

    iterator begin();

    ConstIterator begin() const;

    iterator end();

    ConstIterator end() const;

    char& operator[](size_t index);

    const char& operator[](size_t index) const;

    char& at(size_t index);

    const char& at(size_t index) const;

    void reserve(size_t capacity);

    void resize(size_t size);

    void resize(size_t size, char filler);

    String& insert(size_t offset, const char* text, size_t textSize);

    String& append(const char* text, size_t textSize);

    String& assign(const char* text, size_t textSize);

    String& replace(size_t offset, size_t count, const char* text, size_t textSize);

    void erase(size_t offset, size_t count);

    void clear();

    operator std::string() const;

    bool operator==(const String& other) const;

    bool operator!=(const String& other) const;

    String& operator=(const String& other);

    String& operator=(const std::string& other);

    String& operator=(const char* other);

    String& operator=(char other);

    String& operator+=(const String& text);

    String& operator+=(const char* text);

    String& operator+=(const std::string& text);

    String& operator+=(char character);
 
private:
    enum Traits
    {
        PreallocatedSize = 3 * sizeof(size_t)
    };
 
    char* text_;
    size_t size_;
    size_t capacity_;
    char preallocated_[PreallocatedSize];
 
    void grow(size_t delta);
    void shrink(size_t delta);
};
 
inline bool String::empty() const
{
    return (0 == size_);
}
 
inline size_t String::size() const
{
    return size_;
}
 
inline size_t String::capacity() const
{
    return (capacity_ - 1);
}
 
inline const char* String::data() const
{
    return text_;
}
 
inline const char* String::c_str() const
{
    return text_;
}
 
inline String::iterator String::begin()
{
    return text_;
}
 
inline String::ConstIterator String::begin() const
{
    return text_;
}
 
inline String::iterator String::end()
{
    return (text_ + size_);
}
 
inline String::ConstIterator String::end() const
{
    return (text_ + size_);
}
 
inline char& String::operator[](size_t index)
{
    return text_[index];
}
 
inline const char& String::operator[](size_t index) const
{
    return text_[index];
}
 
inline char& String::at(size_t index)
{
    if (index < size_)
    {
        return text_[index];
    }
 
    throw std::out_of_range("index");
}
 
inline const char& String::at(size_t index) const
{
    if (index < size_)
    {
        return text_[index];
    }
 
    throw std::out_of_range("index");
}
 
inline String::operator std::string() const
{
    return std::string(text_, size_);
}
 
inline String& String::operator=(const std::string& other)
{
    return assign(other.data(), other.size());
}
 
inline String& String::operator=(const char* other)
{
    if (other)
    {
        assign(other, strlen(other));
    }
 
    return *this;
}
 
inline String& String::operator=(char other)
{
    return assign(&other, 1);
}
 
inline String& String::operator+=(const String& text)
{
    return append(text.data(), text.size());
}
 
inline String& String::operator+=(const char* text)
{
    if (text)
    {
        append(text, strlen(text));
    }
 
    return *this;
}
 
inline String& String::operator+=(const std::string& text)
{
    return append(text.data(), text.size());
}
 
inline String& String::operator+=(char character)
{
    return append(&character, 1);
}

class ONIXS_CME_DROP_COPY_EXPORT StringRef
{
public:
    typedef const char* ConstIterator;

    StringRef()
      : chars_(NULL)
      , size_(0)
    {
    }

    StringRef(const char* chars, size_t size)
      : chars_(chars)
      , size_(size)
    {
    }

    StringRef(const StringRef& other)
      : chars_(other.chars_)
      , size_(other.size_)
    {
    }

    explicit StringRef(const std::string& stdStr)
      : chars_(stdStr.c_str())
      , size_(stdStr.size())
    {
    }

    explicit StringRef(const String& ownStr)
      : chars_(ownStr.data())
      , size_(ownStr.size())
    {
    }

    explicit StringRef(const char* cStr)
      : chars_(cStr)
      , size_(cStr ? strlen(cStr) : 0)
    {
    }

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

    const char* data() const
    {
        return chars_;
    }

    ConstIterator begin() const
    {
        return chars_;
    }

    ConstIterator end() const
    {
        return chars_ + size_;
    }

    size_t size() const
    {
        return size_;
    }

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

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

    template <typename NumericType>
    bool toNumber(NumericType& number) const
    {
        return OnixS::CME::DropCopy::Number::tryParse(chars_, size_, number);
    }
 
    // Appends copy of text to the std::string.
    void toString(std::string& str) const
    {
        str.append(chars_, size_);
    }
 
    // Return copy of text as std::string.
    std::string toString() const
    {
        return std::string(chars_, size_);
    }

    operator std::string() const
    {
        return std::string(chars_, size_);
    }

    bool operator==(const StringRef& other) const
    {
        return (size_ == other.size_ && 0 == memcmp(chars_, other.chars_, size_));
    }

    bool operator!=(const StringRef& other) const
    {
        return (size_ != other.size_ || 0 != memcmp(chars_, other.chars_, size_));
    }

    StringRef& operator=(const StringRef& other)
    {
        chars_ = other.chars_;
        size_ = other.size_;
 
        return *this;
    }

    void swap(StringRef& other)
    {
        std::swap(chars_, other.chars_);
        std::swap(size_, other.size_);
    }
 
private:
    const char* chars_;

    size_t size_;
};
 
inline bool operator==(const StringRef& ref, const String& str)
{
    return ref == StringRef(str);
}
 
inline bool operator!=(const StringRef& ref, const String& str)
{
    return ref != StringRef(str);
}
 
inline bool operator==(const String& str, const StringRef& ref)
{
    return ref == StringRef(str);
}
 
inline bool operator!=(const String& str, const StringRef& ref)
{
    return ref != StringRef(str);
}
 
inline bool operator==(const StringRef& ref, const std::string& str)
{
    return ref == StringRef(str);
}
 
inline bool operator!=(const StringRef& ref, const std::string& str)
{
    return ref != StringRef(str);
}
 
inline bool operator==(const std::string& str, const StringRef& ref)
{
    return ref == StringRef(str);
}
 
inline bool operator!=(const std::string& str, const StringRef& ref)
{
    return ref != StringRef(str);
}
 
inline bool operator==(const StringRef& ref, const char* str)
{
    return ref == StringRef(str);
}
 
inline bool operator!=(const StringRef& ref, const char* str)
{
    return ref != StringRef(str);
}
 
inline bool operator==(const char* str, const StringRef& ref)
{
    return ref == StringRef(str);
}
 
inline bool operator!=(const char* str, const StringRef& ref)
{
    return ref != StringRef(str);
}
 
}}}
 
namespace std {

template <>
struct ONIXS_CME_DROP_COPY_EXPORT less<OnixS::CME::DropCopy::StringRef>
{
    bool operator()(
        const OnixS::CME::DropCopy::StringRef& left,
        const OnixS::CME::DropCopy::StringRef& right
    ) const
    {
        ptrdiff_t compareResult = memcmp(
            left.data(), right.data(), left.size() < right.size() ? left.size() : right.size()
        );
 
        if (0 == compareResult)
        {
            compareResult = static_cast<ptrdiff_t>(left.size() - right.size());
        }
 
        return (0 > compareResult);
    }
};

template <>
struct ONIXS_CME_DROP_COPY_EXPORT less<OnixS::CME::DropCopy::String>
{
    bool operator()(
        const OnixS::CME::DropCopy::String& left,
        const OnixS::CME::DropCopy::String& right
    ) const
    {
        return std::less<OnixS::CME::DropCopy::StringRef>()(
            OnixS::CME::DropCopy::StringRef(left), OnixS::CME::DropCopy::StringRef(right)
        );
    }
};
 
inline std::ostream& operator<<(std::ostream& stream, const OnixS::CME::DropCopy::StringRef& text)
{
    stream.write(text.data(), text.size());
    return stream;
}
 
inline std::ostream& operator<<(std::ostream& stream, const OnixS::CME::DropCopy::String& text)
{
    stream.write(text.data(), text.size());
    return stream;
}
 
}