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#ifndef ADHOCUTIL_BUFFER_H
#define ADHOCUTIL_BUFFER_H
#include <string>
#include <vector>
#include <cstdarg>
#include <boost/format.hpp>
#include "visibility.h"
#include "c++11Helpers.h"
namespace AdHoc {
class DLL_PUBLIC Buffer;
}
namespace std {
DLL_PUBLIC std::ostream & operator<<(std::ostream &, const AdHoc::Buffer &);
}
namespace AdHoc {
/// High-speed text buffer for easy creation of programatically created strings.
class DLL_PUBLIC Buffer {
public:
/** How should Buffer handle char * arguments? */
enum CStringHandling {
/// Use the memory passed verbatim.
Use,
/// Copy the memory passed to it for it's own use.
Copy,
/// Use the memory passed verbatim and free it when finished.
Free
};
/// Pointer typedef.
using Ptr = std::shared_ptr<Buffer>;
/// Const pointer typedef.
using CPtr = std::shared_ptr<const Buffer>;
/** Create an empty buffer */
Buffer() = default;
~Buffer() = default;
/** Create a buffer containing a single element from the given char * */
Buffer(const char * src, CStringHandling);
/** Create a buffer containing a single element from the given char * */
Buffer(char * src, CStringHandling);
/** Create a buffer containing a single element from the given std::string */
explicit Buffer(const std::string &);
/// Standard move/copy support
SPECIAL_MEMBERS_DEFAULT(Buffer);
/** Append the given char * (will copy) */
Buffer & operator+=(const char * str);
/** Append the given std::string */
Buffer & operator+=(const std::string & str);
/** Replace all current content with the given char * (will copy) */
Buffer & operator=(const char * str);
/** Replace all current content with the given std::string */
Buffer & operator=(const std::string & str);
/** true if the buffer contains no elements (empty) */
bool operator!() const;
/** true if the buffer contains no elements (non-empty) */
explicit operator bool() const;
/** Converts all elements into a single flattened std::string */
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator std::string() const;
/** Converts all elements into a single flattened char * */
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator const char *() const;
/**
* Writes all elements in turn to the given buffer space, including a null terminator.
* @param buf Address of buffer to write into.
* @param bufSize Maximum number of bytes to write.
* @param off Effective starting position to copy from.
*/
void writeto(char * buf, size_t bufSize, size_t off) const;
/** Write the Buffer to a std::ostream */
friend std::ostream & std::operator<<(std::ostream &, const Buffer &);
/** Append the given char * to the end of the buffer. */
Buffer & append(const char * str, CStringHandling h);
/** Append the given char * to the end of the buffer. */
Buffer & append(char * str, CStringHandling h);
/** Append the given std::string to the end of the buffer. */
Buffer & append(const std::string & str);
/** Append the given printf style format string and arguments to the buffer. */
Buffer & appendf(const char * fmt, ...) __attribute__((format (printf, 2, 3)));
/** Append the given printf style format string and va_list to the buffer. */
Buffer & vappendf(const char * fmt, va_list args);
/** Append the given boost::format style format string and arguments to the buffer. */
template <typename ... Params>
Buffer & appendbf(const std::string & fmtstr, const Params & ... params)
{
auto bf = getFormat(fmtstr);
return appendbf(bf, params...);
}
/** Append the given boost::format and arguments to the buffer. */
template <typename Param, typename ... Params>
Buffer & appendbf(boost::format & fmt, const Param & param, const Params & ... params)
{
fmt % param;
return appendbf(fmt, params...);
}
/** Clear the Buffer of all content. */
Buffer & clear();
/** Get the total size of all elements. */
size_t length() const;
/** Test if the Buffer is empty. */
bool empty() const;
/** Flattern the Buffer and return it as a std::string. */
std::string str() const;
/** Helper function to centralize the construction of boost::format instances. */
static boost::format getFormat(const std::string & msgfmt);
private:
Buffer & appendbf(boost::format & fmt);
void DLL_PRIVATE flatten() const;
class DLL_PRIVATE FragmentBase {
public:
FragmentBase() = default;
virtual ~FragmentBase() = default;
SPECIAL_MEMBERS_DEFAULT(FragmentBase);
[[nodiscard]] virtual size_t length() const = 0;
[[nodiscard]] virtual char operator[](size_t) const = 0;
[[nodiscard]] virtual const char * c_str() const = 0;
[[nodiscard]] virtual std::string str() const = 0;
};
class DLL_PRIVATE CStringFragment : public FragmentBase {
public:
CStringFragment(const char *, CStringHandling);
CStringFragment(const char *, CStringHandling, size_t);
CStringFragment(char *, CStringHandling);
CStringFragment(char *, CStringHandling, size_t);
SPECIAL_MEMBERS_DELETE(CStringFragment);
~CStringFragment() override;
[[nodiscard]] size_t length() const override;
[[nodiscard]] char operator[](size_t) const override;
[[nodiscard]] const char * c_str() const override;
[[nodiscard]] std::string str() const override;
private:
const size_t len; // Excluding NULL term
const char * buf;
const CStringHandling handling;
};
class DLL_PRIVATE StringFragment : public FragmentBase {
public:
explicit StringFragment(std::string);
[[nodiscard]] size_t length() const override;
[[nodiscard]] char operator[](size_t) const override;
[[nodiscard]] const char * c_str() const override;
[[nodiscard]] std::string str() const override;
private:
const std::string buf;
};
using FragmentPtr = std::shared_ptr<FragmentBase>;
using Content = std::vector<FragmentPtr>;
mutable Content content;
};
}
// libmisc compat macros
#define vstringf(...) AdHoc::Buffer().vappendf(__VA_ARGS__).str()
#define stringf(...) AdHoc::Buffer().appendf(__VA_ARGS__).str()
#define stringbf(...) AdHoc::Buffer().appendbf(__VA_ARGS__).str()
#endif
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