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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/string.h>
namespace vespalib {
///Modifiers to make usage similar to std::stream
enum Base {bin=2, oct=8, dec=10, hex=16};
///Modifiers to make usage similar to std::stream
enum FloatSpec {automatic, fixed, scientific};
enum FloatModifier {defaultdotting, forcedot};
#define VESPALIB_ASCIISTREAM_MAX_PRECISION 32
/**
* This is a simple stream intended for building strings the stream
* way. Everything is streamed into an underlying memory buffer that
* can be retrieved as a string. It is supposed to be compliant to the
* std::stringstream API. The stream has both a read and a write
* pointer, so it can be used for both input and output.
*
* However it is considerably more lightweight than the std::stream
* variant. It does not support 'locale' and other expensive stuff;
* and can be seen as "convenience without sacrificing speed".
*/
class asciistream
{
public:
asciistream();
asciistream(stringref buf);
~asciistream();
asciistream(const asciistream & rhs);
asciistream & operator = (const asciistream & rhs);
asciistream(asciistream &&) noexcept;
asciistream & operator = (asciistream &&) noexcept;
void swap(asciistream & rhs) noexcept;
asciistream & operator << (bool v) { if (v) { *this << '1'; } else { *this << '0'; } return *this; }
asciistream & operator << (char v) { doFill(1); write(&v, 1); return *this; }
asciistream & operator << (signed char v) { doFill(1); write(&v, 1); return *this; }
asciistream & operator << (unsigned char v) { doFill(1); write(&v, 1); return *this; }
asciistream & operator << (const char * v) { if (v != nullptr) { size_t n(strlen(v)); doFill(n); write(v, n); } return *this; }
asciistream & operator << (const string & v) { doFill(v.size()); write(v.data(), v.size()); return *this; }
asciistream & operator << (stringref v) { doFill(v.size()); write(v.data(), v.size()); return *this; }
asciistream & operator << (const std::string & v) { doFill(v.size()); write(v.data(), v.size()); return *this; }
asciistream & operator << (short v) { return *this << static_cast<long long>(v); }
asciistream & operator << (unsigned short v) { return *this << static_cast<unsigned long long>(v); }
asciistream & operator << (int v) { return *this << static_cast<long long>(v); }
asciistream & operator << (unsigned int v) { return *this << static_cast<unsigned long long>(v); }
asciistream & operator << (const void* p);
asciistream & operator << (long v) { return *this << static_cast<long long>(v); }
asciistream & operator << (unsigned long v) { return *this << static_cast<unsigned long long>(v); }
asciistream & operator << (long long v);
asciistream & operator << (unsigned long long v);
asciistream & operator << (float v);
asciistream & operator << (double v);
asciistream & operator << (Base v) { _base = v; return *this; }
asciistream & operator >> (Base v) { _base = v; return *this; }
asciistream & operator << (FloatSpec v) { _floatSpec = v; return *this; }
asciistream & operator >> (FloatSpec v) { _floatSpec = v; return *this; }
asciistream & operator << (FloatModifier v) { _floatModifier = v; return *this; }
asciistream & operator >> (FloatModifier v) { _floatModifier = v; return *this; }
asciistream & operator >> (bool & v);
asciistream & operator >> (char & v);
asciistream & operator >> (signed char & v);
asciistream & operator >> (unsigned char & v);
asciistream & operator >> (std::string & v);
asciistream & operator >> (string & v);
asciistream & operator >> (short & v);
asciistream & operator >> (unsigned short & v);
asciistream & operator >> (int & v);
asciistream & operator >> (unsigned int & v);
asciistream & operator >> (long & v);
asciistream & operator >> (unsigned long & v);
asciistream & operator >> (long long & v);
asciistream & operator >> (unsigned long long & v);
asciistream & operator >> (float & v);
asciistream & operator >> (double & v);
stringref str() const { return stringref(c_str(), size()); }
const char * c_str() const { return _rbuf.data() + _rPos; }
size_t size() const { return length() - _rPos; }
bool empty() const { return size() == 0; }
bool eof() const { return empty(); }
bool fail() const { return false; }
size_t capacity() const { return _wbuf.capacity(); }
void clear() { _rPos = 0; _wbuf.clear(); _rbuf = _wbuf; }
class Width {
public:
Width(size_t width) : _width(width) { }
size_t getWidth() const { return _width; }
private:
uint32_t _width;
};
class Fill {
public:
Fill(char fill) : _fill(fill) { }
char getFill() const { return _fill; }
private:
char _fill;
};
class Precision {
public:
Precision(size_t precision) : _precision(precision) { }
size_t getPrecision() const { return _precision; }
private:
uint32_t _precision;
};
class StateSaver {
public:
// Don't generate move/copy constructors as this class is only intended to
// live on a single stack frame
StateSaver(StateSaver&&) = delete;
StateSaver& operator=(StateSaver&&) = delete;
StateSaver(const StateSaver&) = delete;
StateSaver& operator=(const StateSaver&) = delete;
explicit StateSaver(asciistream& as) noexcept :
_as(as),
_base(as._base),
_floatSpec(as._floatSpec),
_floatModifier(as._floatModifier),
_width(as._width),
_fill(as._fill),
_precision(as._precision) {}
~StateSaver() noexcept {
_as._base = _base;
_as._floatSpec = _floatSpec;
_as._floatModifier = _floatModifier;
_as._width = _width;
_as._fill = _fill;
_as._precision = _precision;
}
private:
asciistream& _as;
Base _base;
FloatSpec _floatSpec;
FloatModifier _floatModifier;
uint32_t _width;
char _fill;
uint8_t _precision;
};
asciistream & operator << (Width v) { _width = v.getWidth(); return *this; }
asciistream & operator >> (Width v) { _width = v.getWidth(); return *this; }
asciistream & operator << (Fill v) { _fill = v.getFill(); return *this; }
asciistream & operator >> (Fill v) { _fill = v.getFill(); return *this; }
asciistream & operator << (Precision v);
asciistream & operator >> (Precision v);
void eatWhite();
static asciistream createFromFile(stringref fileName);
static asciistream createFromDevice(stringref fileName);
string getline(char delim='\n');
char getFill() const noexcept { return _fill; }
size_t getWidth() const noexcept { return static_cast<size_t>(_width); } // match input type of setw
Base getBase() const noexcept { return _base; }
private:
template <typename T>
void printFixed(T v) __attribute__((noinline));
template <typename T>
void printScientific(T v) __attribute__((noinline));
void eatNonWhite();
void doReallyFill(size_t currWidth);
void doFill(size_t currWidth) {
if (_width > currWidth) {
doReallyFill(currWidth);
}
_width = 0;
}
void write(const void * buf, size_t len);
size_t length() const { return _rbuf.size(); }
size_t _rPos;
string _wbuf;
stringref _rbuf;
Base _base;
FloatSpec _floatSpec;
FloatModifier _floatModifier;
uint32_t _width;
char _fill;
uint8_t _precision;
};
ssize_t getline(asciistream & is, vespalib::string & line, char delim='\n');
inline asciistream::Width setw(size_t v) { return asciistream::Width(v); }
inline asciistream::Fill setfill(char v) { return asciistream::Fill(v); }
inline asciistream::Precision setprecision(size_t v) { return asciistream::Precision(v); }
}
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