fmtlegacy/include/fmt/printf.h

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// Formatting library for C++
//
// Copyright (c) 2012 - 2016, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#ifndef FMT_PRINTF_H_
#define FMT_PRINTF_H_
#include <algorithm> // std::fill_n
#include <limits> // std::numeric_limits
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#include "ostream.h"
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FMT_BEGIN_NAMESPACE
namespace internal {
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// A helper function to suppress bogus "conditional expression is constant"
// warnings.
template <typename T> inline T const_check(T value) { return value; }
// Checks if a value fits in int - used to avoid warnings about comparing
// signed and unsigned integers.
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template <bool IsSigned> struct int_checker {
template <typename T> static bool fits_in_int(T value) {
unsigned max = std::numeric_limits<int>::max();
return value <= max;
}
static bool fits_in_int(bool) { return true; }
};
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template <> struct int_checker<true> {
template <typename T> static bool fits_in_int(T value) {
return value >= std::numeric_limits<int>::min() &&
value <= std::numeric_limits<int>::max();
}
static bool fits_in_int(int) { return true; }
};
class printf_precision_handler {
public:
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
int operator()(T value) {
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if (!int_checker<std::numeric_limits<T>::is_signed>::fits_in_int(value))
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FMT_THROW(format_error("number is too big"));
return (std::max)(static_cast<int>(value), 0);
}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
int operator()(T) {
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FMT_THROW(format_error("precision is not integer"));
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return 0;
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}
};
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// An argument visitor that returns true iff arg is a zero integer.
class is_zero_int {
public:
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
bool operator()(T value) {
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return value == 0;
}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
bool operator()(T) {
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return false;
}
};
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template <typename T> struct make_unsigned_or_bool : std::make_unsigned<T> {};
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template <> struct make_unsigned_or_bool<bool> { typedef bool type; };
template <typename T, typename Context> class arg_converter {
private:
typedef typename Context::char_type Char;
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basic_format_arg<Context>& arg_;
typename Context::char_type type_;
public:
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arg_converter(basic_format_arg<Context>& arg, Char type)
: arg_(arg), type_(type) {}
void operator()(bool value) {
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if (type_ != 's') operator()<bool>(value);
}
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template <typename U, FMT_ENABLE_IF(std::is_integral<U>::value)>
void operator()(U value) {
bool is_signed = type_ == 'd' || type_ == 'i';
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using target_type = conditional_t<std::is_same<T, void>::value, U, T>;
if (const_check(sizeof(target_type) <= sizeof(int))) {
// Extra casts are used to silence warnings.
if (is_signed) {
arg_ = internal::make_arg<Context>(
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static_cast<int>(static_cast<target_type>(value)));
} else {
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typedef typename make_unsigned_or_bool<target_type>::type Unsigned;
arg_ = internal::make_arg<Context>(
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static_cast<unsigned>(static_cast<Unsigned>(value)));
}
} else {
if (is_signed) {
// glibc's printf doesn't sign extend arguments of smaller types:
// std::printf("%lld", -42); // prints "4294967254"
// but we don't have to do the same because it's a UB.
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arg_ = internal::make_arg<Context>(static_cast<long long>(value));
} else {
arg_ = internal::make_arg<Context>(
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static_cast<typename make_unsigned_or_bool<U>::type>(value));
}
}
}
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template <typename U, FMT_ENABLE_IF(!std::is_integral<U>::value)>
void operator()(U) {} // No conversion needed for non-integral types.
};
// Converts an integer argument to T for printf, if T is an integral type.
// If T is void, the argument is converted to corresponding signed or unsigned
// type depending on the type specifier: 'd' and 'i' - signed, other -
// unsigned).
template <typename T, typename Context, typename Char>
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void convert_arg(basic_format_arg<Context>& arg, Char type) {
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visit_format_arg(arg_converter<T, Context>(arg, type), arg);
}
// Converts an integer argument to char for printf.
template <typename Context> class char_converter {
private:
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basic_format_arg<Context>& arg_;
public:
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explicit char_converter(basic_format_arg<Context>& arg) : arg_(arg) {}
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
void operator()(T value) {
typedef typename Context::char_type Char;
arg_ = internal::make_arg<Context>(static_cast<Char>(value));
}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
void operator()(T) {} // No conversion needed for non-integral types.
};
// Checks if an argument is a valid printf width specifier and sets
// left alignment if it is negative.
template <typename Char> class printf_width_handler {
private:
typedef basic_format_specs<Char> format_specs;
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format_specs& spec_;
public:
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explicit printf_width_handler(format_specs& spec) : spec_(spec) {}
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
unsigned operator()(T value) {
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typedef typename internal::int_traits<T>::main_type UnsignedType;
UnsignedType width = static_cast<UnsignedType>(value);
if (internal::is_negative(value)) {
spec_.align_ = ALIGN_LEFT;
width = 0 - width;
}
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unsigned int_max = std::numeric_limits<int>::max();
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if (width > int_max) FMT_THROW(format_error("number is too big"));
return static_cast<unsigned>(width);
}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
unsigned operator()(T) {
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FMT_THROW(format_error("width is not integer"));
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return 0;
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}
};
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template <typename Char, typename Context>
void printf(buffer<Char>& buf, basic_string_view<Char> format,
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basic_format_args<Context> args) {
Context(std::back_inserter(buf), format, args).format();
}
template <typename OutputIt, typename Char, typename Context>
internal::truncating_iterator<OutputIt> printf(
internal::truncating_iterator<OutputIt> it, basic_string_view<Char> format,
basic_format_args<Context> args) {
return Context(it, format, args).format();
}
} // namespace internal
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using internal::printf; // For printing into memory_buffer.
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template <typename Range> class printf_arg_formatter;
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template <typename OutputIt, typename Char> class basic_printf_context;
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/**
\rst
The ``printf`` argument formatter.
\endrst
*/
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template <typename Range>
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class printf_arg_formatter : public internal::arg_formatter_base<Range> {
public:
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typedef decltype(std::declval<Range>().begin()) iterator;
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private:
typedef typename Range::value_type char_type;
typedef internal::arg_formatter_base<Range> base;
typedef basic_printf_context<iterator, char_type> context_type;
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context_type& context_;
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void write_null_pointer(char) {
this->spec()->type = 0;
this->write("(nil)");
}
void write_null_pointer(wchar_t) {
this->spec()->type = 0;
this->write(L"(nil)");
}
public:
typedef typename base::format_specs format_specs;
/**
\rst
Constructs an argument formatter object.
*buffer* is a reference to the output buffer and *spec* contains format
specifier information for standard argument types.
\endrst
*/
printf_arg_formatter(iterator iter, format_specs& spec, context_type& ctx)
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: base(Range(iter), &spec, internal::locale_ref()), context_(ctx) {}
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
iterator operator()(T value) {
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// MSVC2013 fails to compile separate overloads for bool and char_type so
// use std::is_same instead.
if (std::is_same<T, bool>::value) {
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format_specs& fmt_spec = *this->spec();
if (fmt_spec.type != 's') return base::operator()(value ? 1 : 0);
fmt_spec.type = 0;
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this->write(value != 0);
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} else if (std::is_same<T, char_type>::value) {
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format_specs& fmt_spec = *this->spec();
if (fmt_spec.type && fmt_spec.type != 'c')
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return (*this)(static_cast<int>(value));
fmt_spec.flags = 0;
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fmt_spec.align_ = ALIGN_RIGHT;
return base::operator()(value);
} else {
return base::operator()(value);
}
return this->out();
}
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template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
iterator operator()(T value) {
return base::operator()(value);
}
/** Formats a null-terminated C string. */
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iterator operator()(const char* value) {
if (value)
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base::operator()(value);
else if (this->spec()->type == 'p')
write_null_pointer(char_type());
else
this->write("(null)");
return this->out();
}
/** Formats a null-terminated wide C string. */
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iterator operator()(const wchar_t* value) {
if (value)
base::operator()(value);
else if (this->spec()->type == 'p')
write_null_pointer(char_type());
else
this->write(L"(null)");
return this->out();
}
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iterator operator()(basic_string_view<char_type> value) {
return base::operator()(value);
}
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iterator operator()(monostate value) { return base::operator()(value); }
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/** Formats a pointer. */
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iterator operator()(const void* value) {
if (value) return base::operator()(value);
this->spec()->type = 0;
write_null_pointer(char_type());
return this->out();
}
/** Formats an argument of a custom (user-defined) type. */
iterator operator()(typename basic_format_arg<context_type>::handle handle) {
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handle.format(context_.parse_context(), context_);
return this->out();
}
};
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template <typename T> struct printf_formatter {
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template <typename ParseContext>
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auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
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template <typename FormatContext>
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auto format(const T& value, FormatContext& ctx) -> decltype(ctx.out()) {
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internal::format_value(internal::get_container(ctx.out()), value);
return ctx.out();
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}
};
/** This template formats data and writes the output to a writer. */
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template <typename OutputIt, typename Char> class basic_printf_context {
public:
/** The character type for the output. */
using char_type = Char;
using format_arg = basic_format_arg<basic_printf_context>;
template <typename T> using formatter_type = printf_formatter<T>;
private:
typedef basic_format_specs<char_type> format_specs;
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OutputIt out_;
basic_format_args<basic_printf_context> args_;
basic_parse_context<Char> parse_ctx_;
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static void parse_flags(format_specs& spec, const Char*& it, const Char* end);
// Returns the argument with specified index or, if arg_index is equal
// to the maximum unsigned value, the next argument.
format_arg get_arg(unsigned arg_index = std::numeric_limits<unsigned>::max());
// Parses argument index, flags and width and returns the argument index.
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unsigned parse_header(const Char*& it, const Char* end, format_specs& spec);
public:
/**
\rst
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Constructs a ``printf_context`` object. References to the arguments and
the writer are stored in the context object so make sure they have
appropriate lifetimes.
\endrst
*/
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basic_printf_context(OutputIt out, basic_string_view<char_type> format_str,
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basic_format_args<basic_printf_context> args)
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: out_(out), args_(args), parse_ctx_(format_str) {}
OutputIt out() { return out_; }
void advance_to(OutputIt it) { out_ = it; }
format_arg arg(unsigned id) const { return args_.get(id); }
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basic_parse_context<Char>& parse_context() { return parse_ctx_; }
FMT_CONSTEXPR void on_error(const char* message) {
parse_ctx_.on_error(message);
}
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/** Formats stored arguments and writes the output to the range. */
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template <typename ArgFormatter =
printf_arg_formatter<internal::buffer_range<Char>>>
OutputIt format();
};
template <typename OutputIt, typename Char>
void basic_printf_context<OutputIt, Char>::parse_flags(format_specs& spec,
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const Char*& it,
const Char* end) {
for (; it != end; ++it) {
switch (*it) {
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case '-':
spec.align_ = ALIGN_LEFT;
break;
case '+':
spec.flags |= SIGN_FLAG | PLUS_FLAG;
break;
case '0':
spec.fill_ = '0';
break;
case ' ':
spec.flags |= SIGN_FLAG;
break;
case '#':
spec.flags |= HASH_FLAG;
break;
default:
return;
}
}
}
template <typename OutputIt, typename Char>
typename basic_printf_context<OutputIt, Char>::format_arg
basic_printf_context<OutputIt, Char>::get_arg(unsigned arg_index) {
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if (arg_index == std::numeric_limits<unsigned>::max())
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arg_index = parse_ctx_.next_arg_id();
else
parse_ctx_.check_arg_id(--arg_index);
return internal::get_arg(*this, arg_index);
}
template <typename OutputIt, typename Char>
unsigned basic_printf_context<OutputIt, Char>::parse_header(
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const Char*& it, const Char* end, format_specs& spec) {
unsigned arg_index = std::numeric_limits<unsigned>::max();
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char_type c = *it;
if (c >= '0' && c <= '9') {
// Parse an argument index (if followed by '$') or a width possibly
// preceded with '0' flag(s).
internal::error_handler eh;
unsigned value = parse_nonnegative_int(it, end, eh);
if (it != end && *it == '$') { // value is an argument index
++it;
arg_index = value;
} else {
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if (c == '0') spec.fill_ = '0';
if (value != 0) {
// Nonzero value means that we parsed width and don't need to
// parse it or flags again, so return now.
spec.width_ = value;
return arg_index;
}
}
}
parse_flags(spec, it, end);
// Parse width.
if (it != end) {
if (*it >= '0' && *it <= '9') {
internal::error_handler eh;
spec.width_ = parse_nonnegative_int(it, end, eh);
} else if (*it == '*') {
++it;
spec.width_ = visit_format_arg(
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internal::printf_width_handler<char_type>(spec), get_arg());
}
}
return arg_index;
}
template <typename OutputIt, typename Char>
template <typename ArgFormatter>
OutputIt basic_printf_context<OutputIt, Char>::format() {
auto out = this->out();
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const Char* start = parse_ctx_.begin();
const Char* end = parse_ctx_.end();
auto it = start;
while (it != end) {
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char_type c = *it++;
if (c != '%') continue;
if (it != end && *it == c) {
out = std::copy(start, it, out);
start = ++it;
continue;
}
out = std::copy(start, it - 1, out);
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format_specs spec;
spec.align_ = ALIGN_RIGHT;
// Parse argument index, flags and width.
unsigned arg_index = parse_header(it, end, spec);
// Parse precision.
if (it != end && *it == '.') {
++it;
c = it != end ? *it : 0;
if ('0' <= c && c <= '9') {
internal::error_handler eh;
spec.precision = static_cast<int>(parse_nonnegative_int(it, end, eh));
} else if (c == '*') {
++it;
spec.precision =
visit_format_arg(internal::printf_precision_handler(), get_arg());
} else {
spec.precision = 0;
}
}
format_arg arg = get_arg(arg_index);
if (spec.has(HASH_FLAG) && visit_format_arg(internal::is_zero_int(), arg))
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spec.flags = static_cast<uint_least8_t>(
spec.flags & (~internal::to_unsigned<int>(HASH_FLAG)));
if (spec.fill_ == '0') {
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if (arg.is_arithmetic())
spec.align_ = ALIGN_NUMERIC;
else
spec.fill_ = ' '; // Ignore '0' flag for non-numeric types.
}
// Parse length and convert the argument to the required type.
c = it != end ? *it++ : 0;
char_type t = it != end ? *it : 0;
using internal::convert_arg;
switch (c) {
case 'h':
if (t == 'h') {
++it;
t = it != end ? *it : 0;
convert_arg<signed char>(arg, t);
} else {
convert_arg<short>(arg, t);
}
break;
case 'l':
if (t == 'l') {
++it;
t = it != end ? *it : 0;
convert_arg<long long>(arg, t);
} else {
convert_arg<long>(arg, t);
}
break;
case 'j':
convert_arg<intmax_t>(arg, t);
break;
case 'z':
convert_arg<std::size_t>(arg, t);
break;
case 't':
convert_arg<std::ptrdiff_t>(arg, t);
break;
case 'L':
// printf produces garbage when 'L' is omitted for long double, no
// need to do the same.
break;
default:
--it;
convert_arg<void>(arg, c);
}
// Parse type.
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if (it == end) FMT_THROW(format_error("invalid format string"));
spec.type = static_cast<char>(*it++);
if (arg.is_integral()) {
// Normalize type.
switch (spec.type) {
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case 'i':
case 'u':
spec.type = 'd';
break;
case 'c':
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visit_format_arg(internal::char_converter<basic_printf_context>(arg),
arg);
break;
}
}
start = it;
// Format argument.
visit_format_arg(ArgFormatter(out, spec, *this), arg);
}
return std::copy(start, it, out);
}
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template <typename Buffer> struct basic_printf_context_t {
typedef basic_printf_context<std::back_insert_iterator<Buffer>,
typename Buffer::value_type>
type;
};
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typedef basic_printf_context_t<internal::buffer<char>>::type printf_context;
typedef basic_printf_context_t<internal::buffer<wchar_t>>::type wprintf_context;
typedef basic_format_args<printf_context> printf_args;
typedef basic_format_args<wprintf_context> wprintf_args;
/**
\rst
Constructs an `~fmt::format_arg_store` object that contains references to
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arguments and can be implicitly converted to `~fmt::printf_args`.
\endrst
*/
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template <typename... Args>
inline format_arg_store<printf_context, Args...> make_printf_args(
const Args&... args) {
return {args...};
}
/**
\rst
Constructs an `~fmt::format_arg_store` object that contains references to
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arguments and can be implicitly converted to `~fmt::wprintf_args`.
\endrst
*/
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template <typename... Args>
inline format_arg_store<wprintf_context, Args...> make_wprintf_args(
const Args&... args) {
return {args...};
}
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template <typename S, typename Char = char_t<S>>
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inline std::basic_string<Char> vsprintf(
const S& format,
basic_format_args<
typename basic_printf_context_t<internal::buffer<Char>>::type>
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args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
return to_string(buffer);
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}
/**
\rst
Formats arguments and returns the result as a string.
**Example**::
std::string message = fmt::sprintf("The answer is %d", 42);
\endrst
*/
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template <typename S, typename... Args,
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typename Char = enable_if_t<internal::is_string<S>::value, char_t<S>>>
inline std::basic_string<Char> sprintf(const S& format, const Args&... args) {
using context = typename basic_printf_context_t<internal::buffer<Char>>::type;
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format_arg_store<context, Args...> as{args...};
return vsprintf(to_string_view(format), basic_format_args<context>(as));
}
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template <typename S, typename Char = char_t<S>>
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inline int vfprintf(
std::FILE* f, const S& format,
basic_format_args<
typename basic_printf_context_t<internal::buffer<Char>>::type>
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args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
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std::size_t size = buffer.size();
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return std::fwrite(buffer.data(), sizeof(Char), size, f) < size
? -1
: static_cast<int>(size);
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}
/**
\rst
Prints formatted data to the file *f*.
**Example**::
fmt::fprintf(stderr, "Don't %s!", "panic");
\endrst
*/
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template <typename S, typename... Args,
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typename Char = enable_if_t<internal::is_string<S>::value, char_t<S>>>
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inline int fprintf(std::FILE* f, const S& format, const Args&... args) {
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using context = typename basic_printf_context_t<internal::buffer<Char>>::type;
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format_arg_store<context, Args...> as{args...};
return vfprintf(f, to_string_view(format), basic_format_args<context>(as));
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}
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template <typename S, typename Char = char_t<S>>
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inline int vprintf(
const S& format,
basic_format_args<
typename basic_printf_context_t<internal::buffer<Char>>::type>
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args) {
return vfprintf(stdout, to_string_view(format), args);
}
/**
\rst
Prints formatted data to ``stdout``.
**Example**::
fmt::printf("Elapsed time: %.2f seconds", 1.23);
\endrst
*/
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template <typename S, typename... Args,
FMT_ENABLE_IF(internal::is_string<S>::value)>
inline int printf(const S& format_str, const Args&... args) {
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using buffer = internal::buffer<char_t<S>>;
using context = typename basic_printf_context_t<buffer>::type;
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format_arg_store<context, Args...> as{args...};
return vprintf(to_string_view(format_str), basic_format_args<context>(as));
}
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template <typename S, typename Char = char_t<S>>
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inline int vfprintf(
std::basic_ostream<Char>& os, const S& format,
basic_format_args<
typename basic_printf_context_t<internal::buffer<Char>>::type>
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args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
internal::write(os, buffer);
return static_cast<int>(buffer.size());
}
/** Formats arguments and writes the output to the range. */
template <typename ArgFormatter, typename Char,
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typename Context =
basic_printf_context<typename ArgFormatter::iterator, Char>>
typename ArgFormatter::iterator vprintf(internal::buffer<Char>& out,
basic_string_view<Char> format_str,
basic_format_args<Context> args) {
typename ArgFormatter::iterator iter(out);
Context(iter, format_str, args).template format<ArgFormatter>();
return iter;
}
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/**
\rst
Prints formatted data to the stream *os*.
**Example**::
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fmt::fprintf(cerr, "Don't %s!", "panic");
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\endrst
*/
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template <typename S, typename... Args, typename Char = char_t<S>>
inline int fprintf(std::basic_ostream<Char>& os, const S& format_str,
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const Args&... args) {
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using context = typename basic_printf_context_t<internal::buffer<Char>>::type;
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format_arg_store<context, Args...> as{args...};
return vfprintf(os, to_string_view(format_str),
basic_format_args<context>(as));
}
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FMT_END_NAMESPACE
#endif // FMT_PRINTF_H_