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Duckstation/dep/rapidyaml/include/c4/format.hpp
Stenzek 5c08fa9d00
dep: Add rapidyaml
2024-02-04 16:14:05 +10:00

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#ifndef _C4_FORMAT_HPP_
#define _C4_FORMAT_HPP_
/** @file format.hpp provides type-safe facilities for formatting arguments
* to string buffers */
#include "c4/charconv.hpp"
#include "c4/blob.hpp"
#ifdef _MSC_VER
# pragma warning(push)
# if C4_MSVC_VERSION != C4_MSVC_VERSION_2017
# pragma warning(disable: 4800) // forcing value to bool 'true' or 'false' (performance warning)
# endif
# pragma warning(disable: 4996) // snprintf/scanf: this function or variable may be unsafe
#elif defined(__clang__)
# pragma clang diagnostic push
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wuseless-cast"
#endif
namespace c4 {
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// formatting truthy types as booleans
namespace fmt {
/** write a variable as an alphabetic boolean, ie as either true or false
* @param strict_read */
template<class T>
struct boolalpha_
{
boolalpha_(T val_, bool strict_read_=false) : val(val_ ? true : false), strict_read(strict_read_) {}
bool val;
bool strict_read;
};
template<class T>
boolalpha_<T> boolalpha(T const& val, bool strict_read=false)
{
return boolalpha_<T>(val, strict_read);
}
} // namespace fmt
/** write a variable as an alphabetic boolean, ie as either true or false */
template<class T>
inline size_t to_chars(substr buf, fmt::boolalpha_<T> fmt)
{
return to_chars(buf, fmt.val ? "true" : "false");
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// formatting integral types
namespace fmt {
/** format an integral type with a custom radix */
template<typename T>
struct integral_
{
T val;
T radix;
C4_ALWAYS_INLINE integral_(T val_, T radix_) : val(val_), radix(radix_) {}
};
/** format an integral type with a custom radix, and pad with zeroes on the left */
template<typename T>
struct integral_padded_
{
T val;
T radix;
size_t num_digits;
C4_ALWAYS_INLINE integral_padded_(T val_, T radix_, size_t nd) : val(val_), radix(radix_), num_digits(nd) {}
};
/** format an integral type with a custom radix */
template<class T>
C4_ALWAYS_INLINE integral_<T> integral(T val, T radix=10)
{
return integral_<T>(val, radix);
}
/** format an integral type with a custom radix */
template<class T>
C4_ALWAYS_INLINE integral_<intptr_t> integral(T const* val, T radix=10)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(val), static_cast<intptr_t>(radix));
}
/** format an integral type with a custom radix */
template<class T>
C4_ALWAYS_INLINE integral_<intptr_t> integral(std::nullptr_t, T radix=10)
{
return integral_<intptr_t>(intptr_t(0), static_cast<intptr_t>(radix));
}
/** pad the argument with zeroes on the left, with decimal radix */
template<class T>
C4_ALWAYS_INLINE integral_padded_<T> zpad(T val, size_t num_digits)
{
return integral_padded_<T>(val, T(10), num_digits);
}
/** pad the argument with zeroes on the left */
template<class T>
C4_ALWAYS_INLINE integral_padded_<T> zpad(integral_<T> val, size_t num_digits)
{
return integral_padded_<T>(val.val, val.radix, num_digits);
}
/** pad the argument with zeroes on the left */
C4_ALWAYS_INLINE integral_padded_<intptr_t> zpad(std::nullptr_t, size_t num_digits)
{
return integral_padded_<intptr_t>(0, 16, num_digits);
}
/** pad the argument with zeroes on the left */
template<class T>
C4_ALWAYS_INLINE integral_padded_<intptr_t> zpad(T const* val, size_t num_digits)
{
return integral_padded_<intptr_t>(reinterpret_cast<intptr_t>(val), 16, num_digits);
}
template<class T>
C4_ALWAYS_INLINE integral_padded_<intptr_t> zpad(T * val, size_t num_digits)
{
return integral_padded_<intptr_t>(reinterpret_cast<intptr_t>(val), 16, num_digits);
}
/** format the pointer as an hexadecimal value */
template<class T>
inline integral_<intptr_t> hex(T * v)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(v), intptr_t(16));
}
/** format the pointer as an hexadecimal value */
template<class T>
inline integral_<intptr_t> hex(T const* v)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(v), intptr_t(16));
}
/** format null as an hexadecimal value
* @overload hex */
inline integral_<intptr_t> hex(std::nullptr_t)
{
return integral_<intptr_t>(0, intptr_t(16));
}
/** format the integral_ argument as an hexadecimal value
* @overload hex */
template<class T>
inline integral_<T> hex(T v)
{
return integral_<T>(v, T(16));
}
/** format the pointer as an octal value */
template<class T>
inline integral_<intptr_t> oct(T const* v)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(v), intptr_t(8));
}
/** format the pointer as an octal value */
template<class T>
inline integral_<intptr_t> oct(T * v)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(v), intptr_t(8));
}
/** format null as an octal value */
inline integral_<intptr_t> oct(std::nullptr_t)
{
return integral_<intptr_t>(intptr_t(0), intptr_t(8));
}
/** format the integral_ argument as an octal value */
template<class T>
inline integral_<T> oct(T v)
{
return integral_<T>(v, T(8));
}
/** format the pointer as a binary 0-1 value
* @see c4::raw() if you want to use a binary memcpy instead of 0-1 formatting */
template<class T>
inline integral_<intptr_t> bin(T const* v)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(v), intptr_t(2));
}
/** format the pointer as a binary 0-1 value
* @see c4::raw() if you want to use a binary memcpy instead of 0-1 formatting */
template<class T>
inline integral_<intptr_t> bin(T * v)
{
return integral_<intptr_t>(reinterpret_cast<intptr_t>(v), intptr_t(2));
}
/** format null as a binary 0-1 value
* @see c4::raw() if you want to use a binary memcpy instead of 0-1 formatting */
inline integral_<intptr_t> bin(std::nullptr_t)
{
return integral_<intptr_t>(intptr_t(0), intptr_t(2));
}
/** format the integral_ argument as a binary 0-1 value
* @see c4::raw() if you want to use a raw memcpy-based binary dump instead of 0-1 formatting */
template<class T>
inline integral_<T> bin(T v)
{
return integral_<T>(v, T(2));
}
template<class T>
struct overflow_checked_
{
static_assert(std::is_integral<T>::value, "range checking only for integral types");
C4_ALWAYS_INLINE overflow_checked_(T &val_) : val(&val_) {}
T *val;
};
template<class T>
C4_ALWAYS_INLINE overflow_checked_<T> overflow_checked(T &val)
{
return overflow_checked_<T>(val);
}
} // namespace fmt
/** format an integral_ signed type */
template<typename T>
C4_ALWAYS_INLINE
typename std::enable_if<std::is_signed<T>::value, size_t>::type
to_chars(substr buf, fmt::integral_<T> fmt)
{
return itoa(buf, fmt.val, fmt.radix);
}
/** format an integral_ signed type, pad with zeroes */
template<typename T>
C4_ALWAYS_INLINE
typename std::enable_if<std::is_signed<T>::value, size_t>::type
to_chars(substr buf, fmt::integral_padded_<T> fmt)
{
return itoa(buf, fmt.val, fmt.radix, fmt.num_digits);
}
/** format an integral_ unsigned type */
template<typename T>
C4_ALWAYS_INLINE
typename std::enable_if<std::is_unsigned<T>::value, size_t>::type
to_chars(substr buf, fmt::integral_<T> fmt)
{
return utoa(buf, fmt.val, fmt.radix);
}
/** format an integral_ unsigned type, pad with zeroes */
template<typename T>
C4_ALWAYS_INLINE
typename std::enable_if<std::is_unsigned<T>::value, size_t>::type
to_chars(substr buf, fmt::integral_padded_<T> fmt)
{
return utoa(buf, fmt.val, fmt.radix, fmt.num_digits);
}
template<class T>
C4_ALWAYS_INLINE bool from_chars(csubstr s, fmt::overflow_checked_<T> wrapper)
{
if(C4_LIKELY(!overflows<T>(s)))
return atox(s, wrapper.val);
return false;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// formatting real types
namespace fmt {
template<class T>
struct real_
{
T val;
int precision;
RealFormat_e fmt;
real_(T v, int prec=-1, RealFormat_e f=FTOA_FLOAT) : val(v), precision(prec), fmt(f) {}
};
template<class T>
real_<T> real(T val, int precision, RealFormat_e fmt=FTOA_FLOAT)
{
return real_<T>(val, precision, fmt);
}
} // namespace fmt
inline size_t to_chars(substr buf, fmt::real_< float> fmt) { return ftoa(buf, fmt.val, fmt.precision, fmt.fmt); }
inline size_t to_chars(substr buf, fmt::real_<double> fmt) { return dtoa(buf, fmt.val, fmt.precision, fmt.fmt); }
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// writing raw binary data
namespace fmt {
/** @see blob_ */
template<class T>
struct raw_wrapper_ : public blob_<T>
{
size_t alignment;
C4_ALWAYS_INLINE raw_wrapper_(blob_<T> data, size_t alignment_) noexcept
:
blob_<T>(data),
alignment(alignment_)
{
C4_ASSERT_MSG(alignment > 0 && (alignment & (alignment - 1)) == 0, "alignment must be a power of two");
}
};
using const_raw_wrapper = raw_wrapper_<cbyte>;
using raw_wrapper = raw_wrapper_<byte>;
/** mark a variable to be written in raw binary format, using memcpy
* @see blob_ */
inline const_raw_wrapper craw(cblob data, size_t alignment=alignof(max_align_t))
{
return const_raw_wrapper(data, alignment);
}
/** mark a variable to be written in raw binary format, using memcpy
* @see blob_ */
inline const_raw_wrapper raw(cblob data, size_t alignment=alignof(max_align_t))
{
return const_raw_wrapper(data, alignment);
}
/** mark a variable to be written in raw binary format, using memcpy
* @see blob_ */
template<class T>
inline const_raw_wrapper craw(T const& C4_RESTRICT data, size_t alignment=alignof(T))
{
return const_raw_wrapper(cblob(data), alignment);
}
/** mark a variable to be written in raw binary format, using memcpy
* @see blob_ */
template<class T>
inline const_raw_wrapper raw(T const& C4_RESTRICT data, size_t alignment=alignof(T))
{
return const_raw_wrapper(cblob(data), alignment);
}
/** mark a variable to be read in raw binary format, using memcpy */
inline raw_wrapper raw(blob data, size_t alignment=alignof(max_align_t))
{
return raw_wrapper(data, alignment);
}
/** mark a variable to be read in raw binary format, using memcpy */
template<class T>
inline raw_wrapper raw(T & C4_RESTRICT data, size_t alignment=alignof(T))
{
return raw_wrapper(blob(data), alignment);
}
} // namespace fmt
/** write a variable in raw binary format, using memcpy */
C4CORE_EXPORT size_t to_chars(substr buf, fmt::const_raw_wrapper r);
/** read a variable in raw binary format, using memcpy */
C4CORE_EXPORT bool from_chars(csubstr buf, fmt::raw_wrapper *r);
/** read a variable in raw binary format, using memcpy */
inline bool from_chars(csubstr buf, fmt::raw_wrapper r)
{
return from_chars(buf, &r);
}
/** read a variable in raw binary format, using memcpy */
inline size_t from_chars_first(csubstr buf, fmt::raw_wrapper *r)
{
return from_chars(buf, r);
}
/** read a variable in raw binary format, using memcpy */
inline size_t from_chars_first(csubstr buf, fmt::raw_wrapper r)
{
return from_chars(buf, &r);
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// formatting aligned to left/right
namespace fmt {
template<class T>
struct left_
{
T val;
size_t width;
char pad;
left_(T v, size_t w, char p) : val(v), width(w), pad(p) {}
};
template<class T>
struct right_
{
T val;
size_t width;
char pad;
right_(T v, size_t w, char p) : val(v), width(w), pad(p) {}
};
/** mark an argument to be aligned left */
template<class T>
left_<T> left(T val, size_t width, char padchar=' ')
{
return left_<T>(val, width, padchar);
}
/** mark an argument to be aligned right */
template<class T>
right_<T> right(T val, size_t width, char padchar=' ')
{
return right_<T>(val, width, padchar);
}
} // namespace fmt
template<class T>
size_t to_chars(substr buf, fmt::left_<T> const& C4_RESTRICT align)
{
size_t ret = to_chars(buf, align.val);
if(ret >= buf.len || ret >= align.width)
return ret > align.width ? ret : align.width;
buf.first(align.width).sub(ret).fill(align.pad);
to_chars(buf, align.val);
return align.width;
}
template<class T>
size_t to_chars(substr buf, fmt::right_<T> const& C4_RESTRICT align)
{
size_t ret = to_chars(buf, align.val);
if(ret >= buf.len || ret >= align.width)
return ret > align.width ? ret : align.width;
size_t rem = static_cast<size_t>(align.width - ret);
buf.first(rem).fill(align.pad);
to_chars(buf.sub(rem), align.val);
return align.width;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/// @cond dev
// terminates the variadic recursion
inline size_t cat(substr /*buf*/)
{
return 0;
}
/// @endcond
/** serialize the arguments, concatenating them to the given fixed-size buffer.
* The buffer size is strictly respected: no writes will occur beyond its end.
* @return the number of characters needed to write all the arguments into the buffer.
* @see c4::catrs() if instead of a fixed-size buffer, a resizeable container is desired
* @see c4::uncat() for the inverse function
* @see c4::catsep() if a separator between each argument is to be used
* @see c4::format() if a format string is desired */
template<class Arg, class... Args>
size_t cat(substr buf, Arg const& C4_RESTRICT a, Args const& C4_RESTRICT ...more)
{
size_t num = to_chars(buf, a);
buf = buf.len >= num ? buf.sub(num) : substr{};
num += cat(buf, more...);
return num;
}
/** like c4::cat() but return a substr instead of a size */
template<class... Args>
substr cat_sub(substr buf, Args && ...args)
{
size_t sz = cat(buf, std::forward<Args>(args)...);
C4_CHECK(sz <= buf.len);
return {buf.str, sz <= buf.len ? sz : buf.len};
}
//-----------------------------------------------------------------------------
/// @cond dev
// terminates the variadic recursion
inline size_t uncat(csubstr /*buf*/)
{
return 0;
}
/// @endcond
/** deserialize the arguments from the given buffer.
*
* @return the number of characters read from the buffer, or csubstr::npos
* if a conversion was not successful.
* @see c4::cat(). c4::uncat() is the inverse of c4::cat(). */
template<class Arg, class... Args>
size_t uncat(csubstr buf, Arg & C4_RESTRICT a, Args & C4_RESTRICT ...more)
{
size_t out = from_chars_first(buf, &a);
if(C4_UNLIKELY(out == csubstr::npos))
return csubstr::npos;
buf = buf.len >= out ? buf.sub(out) : substr{};
size_t num = uncat(buf, more...);
if(C4_UNLIKELY(num == csubstr::npos))
return csubstr::npos;
return out + num;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
namespace detail {
template<class Sep>
C4_ALWAYS_INLINE size_t catsep_more(substr /*buf*/, Sep const& C4_RESTRICT /*sep*/)
{
return 0;
}
template<class Sep, class Arg, class... Args>
size_t catsep_more(substr buf, Sep const& C4_RESTRICT sep, Arg const& C4_RESTRICT a, Args const& C4_RESTRICT ...more)
{
size_t ret = to_chars(buf, sep);
size_t num = ret;
buf = buf.len >= ret ? buf.sub(ret) : substr{};
ret = to_chars(buf, a);
num += ret;
buf = buf.len >= ret ? buf.sub(ret) : substr{};
ret = catsep_more(buf, sep, more...);
num += ret;
return num;
}
template<class Sep>
inline size_t uncatsep_more(csubstr /*buf*/, Sep & /*sep*/)
{
return 0;
}
template<class Sep, class Arg, class... Args>
size_t uncatsep_more(csubstr buf, Sep & C4_RESTRICT sep, Arg & C4_RESTRICT a, Args & C4_RESTRICT ...more)
{
size_t ret = from_chars_first(buf, &sep);
size_t num = ret;
if(C4_UNLIKELY(ret == csubstr::npos))
return csubstr::npos;
buf = buf.len >= ret ? buf.sub(ret) : substr{};
ret = from_chars_first(buf, &a);
if(C4_UNLIKELY(ret == csubstr::npos))
return csubstr::npos;
num += ret;
buf = buf.len >= ret ? buf.sub(ret) : substr{};
ret = uncatsep_more(buf, sep, more...);
if(C4_UNLIKELY(ret == csubstr::npos))
return csubstr::npos;
num += ret;
return num;
}
} // namespace detail
/// @cond dev
template<class Sep>
size_t catsep(substr /*buf*/, Sep const& C4_RESTRICT /*sep*/)
{
return 0;
}
/// @endcond
/** serialize the arguments, concatenating them to the given fixed-size
* buffer, using a separator between each argument.
* The buffer size is strictly respected: no writes will occur beyond its end.
* @return the number of characters needed to write all the arguments into the buffer.
* @see c4::catseprs() if instead of a fixed-size buffer, a resizeable container is desired
* @see c4::uncatsep() for the inverse function (ie, reading instead of writing)
* @see c4::cat() if no separator is needed
* @see c4::format() if a format string is desired */
template<class Sep, class Arg, class... Args>
size_t catsep(substr buf, Sep const& C4_RESTRICT sep, Arg const& C4_RESTRICT a, Args const& C4_RESTRICT ...more)
{
size_t num = to_chars(buf, a);
buf = buf.len >= num ? buf.sub(num) : substr{};
num += detail::catsep_more(buf, sep, more...);
return num;
}
/** like c4::catsep() but return a substr instead of a size
* @see c4::catsep(). c4::uncatsep() is the inverse of c4::catsep(). */
template<class... Args>
substr catsep_sub(substr buf, Args && ...args)
{
size_t sz = catsep(buf, std::forward<Args>(args)...);
C4_CHECK(sz <= buf.len);
return {buf.str, sz <= buf.len ? sz : buf.len};
}
/** deserialize the arguments from the given buffer, using a separator.
*
* @return the number of characters read from the buffer, or csubstr::npos
* if a conversion was not successful
* @see c4::catsep(). c4::uncatsep() is the inverse of c4::catsep(). */
template<class Sep, class Arg, class... Args>
size_t uncatsep(csubstr buf, Sep & C4_RESTRICT sep, Arg & C4_RESTRICT a, Args & C4_RESTRICT ...more)
{
size_t ret = from_chars_first(buf, &a), num = ret;
if(C4_UNLIKELY(ret == csubstr::npos))
return csubstr::npos;
buf = buf.len >= ret ? buf.sub(ret) : substr{};
ret = detail::uncatsep_more(buf, sep, more...);
if(C4_UNLIKELY(ret == csubstr::npos))
return csubstr::npos;
num += ret;
return num;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/// @cond dev
// terminates the variadic recursion
inline size_t format(substr buf, csubstr fmt)
{
return to_chars(buf, fmt);
}
/// @endcond
/** using a format string, serialize the arguments into the given
* fixed-size buffer.
* The buffer size is strictly respected: no writes will occur beyond its end.
* In the format string, each argument is marked with a compact
* curly-bracket pair: {}. Arguments beyond the last curly bracket pair
* are silently ignored. For example:
* @code{.cpp}
* c4::format(buf, "the {} drank {} {}", "partier", 5, "beers"); // the partier drank 5 beers
* c4::format(buf, "the {} drank {} {}", "programmer", 6, "coffees"); // the programmer drank 6 coffees
* @endcode
* @return the number of characters needed to write into the buffer.
* @see c4::formatrs() if instead of a fixed-size buffer, a resizeable container is desired
* @see c4::unformat() for the inverse function
* @see c4::cat() if no format or separator is needed
* @see c4::catsep() if no format is needed, but a separator must be used */
template<class Arg, class... Args>
size_t format(substr buf, csubstr fmt, Arg const& C4_RESTRICT a, Args const& C4_RESTRICT ...more)
{
size_t pos = fmt.find("{}"); // @todo use _find_fmt()
if(C4_UNLIKELY(pos == csubstr::npos))
return to_chars(buf, fmt);
size_t num = to_chars(buf, fmt.sub(0, pos));
size_t out = num;
buf = buf.len >= num ? buf.sub(num) : substr{};
num = to_chars(buf, a);
out += num;
buf = buf.len >= num ? buf.sub(num) : substr{};
num = format(buf, fmt.sub(pos + 2), more...);
out += num;
return out;
}
/** like c4::format() but return a substr instead of a size
* @see c4::format()
* @see c4::catsep(). uncatsep() is the inverse of catsep(). */
template<class... Args>
substr format_sub(substr buf, csubstr fmt, Args const& C4_RESTRICT ...args)
{
size_t sz = c4::format(buf, fmt, args...);
C4_CHECK(sz <= buf.len);
return {buf.str, sz <= buf.len ? sz : buf.len};
}
//-----------------------------------------------------------------------------
/// @cond dev
// terminates the variadic recursion
inline size_t unformat(csubstr /*buf*/, csubstr fmt)
{
return fmt.len;
}
/// @endcond
/** using a format string, deserialize the arguments from the given
* buffer.
* @return the number of characters read from the buffer, or npos if a conversion failed.
* @see c4::format(). c4::unformat() is the inverse function to format(). */
template<class Arg, class... Args>
size_t unformat(csubstr buf, csubstr fmt, Arg & C4_RESTRICT a, Args & C4_RESTRICT ...more)
{
const size_t pos = fmt.find("{}");
if(C4_UNLIKELY(pos == csubstr::npos))
return unformat(buf, fmt);
size_t num = pos;
size_t out = num;
buf = buf.len >= num ? buf.sub(num) : substr{};
num = from_chars_first(buf, &a);
if(C4_UNLIKELY(num == csubstr::npos))
return csubstr::npos;
out += num;
buf = buf.len >= num ? buf.sub(num) : substr{};
num = unformat(buf, fmt.sub(pos + 2), more...);
if(C4_UNLIKELY(num == csubstr::npos))
return csubstr::npos;
out += num;
return out;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/** like c4::cat(), but receives a container, and resizes it as needed to contain
* the result. The container is overwritten. To append to it, use the append
* overload.
* @see c4::cat() */
template<class CharOwningContainer, class... Args>
inline void catrs(CharOwningContainer * C4_RESTRICT cont, Args const& C4_RESTRICT ...args)
{
retry:
substr buf = to_substr(*cont);
size_t ret = cat(buf, args...);
cont->resize(ret);
if(ret > buf.len)
goto retry;
}
/** like c4::cat(), but creates and returns a new container sized as needed to contain
* the result.
* @see c4::cat() */
template<class CharOwningContainer, class... Args>
inline CharOwningContainer catrs(Args const& C4_RESTRICT ...args)
{
CharOwningContainer cont;
catrs(&cont, args...);
return cont;
}
/** like c4::cat(), but receives a container, and appends to it instead of
* overwriting it. The container is resized as needed to contain the result.
* @return the region newly appended to the original container
* @see c4::cat()
* @see c4::catrs() */
template<class CharOwningContainer, class... Args>
inline csubstr catrs_append(CharOwningContainer * C4_RESTRICT cont, Args const& C4_RESTRICT ...args)
{
const size_t pos = cont->size();
retry:
substr buf = to_substr(*cont).sub(pos);
size_t ret = cat(buf, args...);
cont->resize(pos + ret);
if(ret > buf.len)
goto retry;
return to_csubstr(*cont).range(pos, cont->size());
}
//-----------------------------------------------------------------------------
/** like c4::catsep(), but receives a container, and resizes it as needed to contain the result.
* The container is overwritten. To append to the container use the append overload.
* @see c4::catsep() */
template<class CharOwningContainer, class Sep, class... Args>
inline void catseprs(CharOwningContainer * C4_RESTRICT cont, Sep const& C4_RESTRICT sep, Args const& C4_RESTRICT ...args)
{
retry:
substr buf = to_substr(*cont);
size_t ret = catsep(buf, sep, args...);
cont->resize(ret);
if(ret > buf.len)
goto retry;
}
/** like c4::catsep(), but create a new container with the result.
* @return the requested container */
template<class CharOwningContainer, class Sep, class... Args>
inline CharOwningContainer catseprs(Sep const& C4_RESTRICT sep, Args const& C4_RESTRICT ...args)
{
CharOwningContainer cont;
catseprs(&cont, sep, args...);
return cont;
}
/** like catsep(), but receives a container, and appends the arguments, resizing the
* container as needed to contain the result. The buffer is appended to.
* @return a csubstr of the appended part
* @ingroup formatting_functions */
template<class CharOwningContainer, class Sep, class... Args>
inline csubstr catseprs_append(CharOwningContainer * C4_RESTRICT cont, Sep const& C4_RESTRICT sep, Args const& C4_RESTRICT ...args)
{
const size_t pos = cont->size();
retry:
substr buf = to_substr(*cont).sub(pos);
size_t ret = catsep(buf, sep, args...);
cont->resize(pos + ret);
if(ret > buf.len)
goto retry;
return to_csubstr(*cont).range(pos, cont->size());
}
//-----------------------------------------------------------------------------
/** like c4::format(), but receives a container, and resizes it as needed
* to contain the result. The container is overwritten. To append to
* the container use the append overload.
* @see c4::format() */
template<class CharOwningContainer, class... Args>
inline void formatrs(CharOwningContainer * C4_RESTRICT cont, csubstr fmt, Args const& C4_RESTRICT ...args)
{
retry:
substr buf = to_substr(*cont);
size_t ret = format(buf, fmt, args...);
cont->resize(ret);
if(ret > buf.len)
goto retry;
}
/** like c4::format(), but create a new container with the result.
* @return the requested container */
template<class CharOwningContainer, class... Args>
inline CharOwningContainer formatrs(csubstr fmt, Args const& C4_RESTRICT ...args)
{
CharOwningContainer cont;
formatrs(&cont, fmt, args...);
return cont;
}
/** like format(), but receives a container, and appends the
* arguments, resizing the container as needed to contain the
* result. The buffer is appended to.
* @return the region newly appended to the original container
* @ingroup formatting_functions */
template<class CharOwningContainer, class... Args>
inline csubstr formatrs_append(CharOwningContainer * C4_RESTRICT cont, csubstr fmt, Args const& C4_RESTRICT ...args)
{
const size_t pos = cont->size();
retry:
substr buf = to_substr(*cont).sub(pos);
size_t ret = format(buf, fmt, args...);
cont->resize(pos + ret);
if(ret > buf.len)
goto retry;
return to_csubstr(*cont).range(pos, cont->size());
}
} // namespace c4
#ifdef _MSC_VER
# pragma warning(pop)
#elif defined(__clang__)
# pragma clang diagnostic pop
#elif defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
#endif /* _C4_FORMAT_HPP_ */
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