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/******************************************************************************
*
* Copyright (C) 1997-2021 by Dimitri van Heesch.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*
* Documents produced by Doxygen are derivative works derived from the
* input used in their production; they are not affected by this license.
*
*/
#ifndef TEXTSTREAM_H
#define TEXTSTREAM_H
#include <string>
#include <iostream>
#include <sstream>
#include <cstdint>
#include <cstdio>
#include <fstream>
#include "qcstring.h"
/** @brief Text streaming class that buffers data.
*
* Simpler version of std::ostringstream that has much better
* performance.
*/
class TextStream final
{
static const int INITIAL_CAPACITY = 4096;
public:
/** Creates an empty stream object.
*/
TextStream()
{
m_buffer.reserve(INITIAL_CAPACITY);
}
/** Create a text stream object for writing to a std::ostream.
* @note data is buffered until flush() is called or the object is destroyed.
*/
TextStream(std::ostream *s) : m_s(s)
{
m_buffer.reserve(INITIAL_CAPACITY);
}
/** Create a text stream, initializing the buffer with string \a s
*/
TextStream(const std::string &s) : m_buffer(s)
{
m_buffer.reserve(s.length()+INITIAL_CAPACITY);
}
/** Writes any data that is buffered to the attached std::ostream */
~TextStream() { flush(); }
TextStream(const TextStream &) = delete;
TextStream &operator=(const TextStream &) = delete;
/** Sets or changes the std::ostream to write to.
* @note Any data already buffered will be flushed.
*/
void setStream(std::ostream *s)
{
flush();
m_s = s;
}
/** Returns the attached std::ostream object.
* @see setStream()
*/
std::ostream *stream() const
{
return m_s;
}
/** Adds a character to the stream */
TextStream &operator<<( char c)
{
m_buffer+=c;
return static_cast<TextStream&>(*this);
}
/** Adds a C-style string to the stream */
TextStream &operator<<( const char *s)
{
if (s) m_buffer+=s;
return static_cast<TextStream&>(*this);
}
/** Adds a QCString to the stream */
TextStream &operator<<( const QCString &s )
{
m_buffer+=s.str();
return static_cast<TextStream&>(*this);
}
/** Adds a std::string to the stream */
TextStream &operator<<( const std::string &s )
{
m_buffer+=s;
return static_cast<TextStream&>(*this);
}
/** Adds a signed short integer to the stream */
TextStream &operator<<( signed short i)
{
output_int32(i,i<0);
return static_cast<TextStream&>(*this);
}
/** Adds a unsigned short integer to the stream */
TextStream &operator<<( unsigned short i)
{
output_int32(i,false);
return static_cast<TextStream&>(*this);
}
/** Adds a signed integer to the stream */
TextStream &operator<<( signed int i)
{
output_int32(i,i<0);
return static_cast<TextStream&>(*this);
}
/** Adds a unsigned integer to the stream */
TextStream &operator<<( unsigned int i)
{
output_int32(i,false);
return static_cast<TextStream&>(*this);
}
/** Adds a float to the stream */
TextStream &operator<<( float f)
{
output_double((double)f);
return static_cast<TextStream&>(*this);
}
/** Adds a double to the stream */
TextStream &operator<<( double d)
{
output_double(d);
return static_cast<TextStream&>(*this);
}
/** Adds a array of character to the stream
* @param buf the character buffer
* @param len the number of characters in the buffer to write
*/
void write(const char *buf,size_t len)
{
m_buffer.append(buf,len);
}
/** Flushes the buffer. If a std::ostream is attached, the buffer's
* contents will be written to the stream.
*/
void flush()
{
if (m_s)
{
m_s->write(m_buffer.c_str(),m_buffer.length());
}
m_buffer.clear();
}
/** Clears any buffered data */
void clear()
{
m_buffer.clear();
}
/** Return the contents of the buffer as a std::string object */
std::string str() const
{
return m_buffer;
}
/** Sets the buffer's contents to string \a s.
* Any data already in the buffer will be flushed.
*/
void str(const std::string &s)
{
flush();
m_buffer=s;
}
/** Sets the buffer's contents to string \a s
* Any data already in the buffer will be flushed.
*/
void str(const char *s)
{
flush();
if (s) m_buffer=s;
}
/** Returns true iff the buffer is empty */
bool empty() const
{
return m_buffer.empty();
}
private:
/** Writes a string representation of an integer to the buffer
* @param n the absolute value of the integer
* @param neg indicates if the integer is negative
*/
void output_int32( uint32_t n, bool neg )
{
char buf[20];
char *p = &buf[19];
*p = '\0';
if ( neg )
{
n = (uint32_t)(-(int32_t)n);
}
do { *--p = ((int32_t)(n%10)) + '0'; n /= 10; } while ( n );
if ( neg ) *--p = '-';
m_buffer+=p;
}
void output_double( double d)
{
char buf[64];
snprintf(buf,64,"%f",d);
m_buffer+=buf;
}
std::string m_buffer;
std::ostream *m_s = nullptr;
};
#endif
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