591e7667f2
Merge commit 'c9dec5da8cb2893219c069f92728fb3997c7d81e'
721 lines
21 KiB
C++
721 lines
21 KiB
C++
// Formatting library for C++ - legacy printf implementation
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//
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// Copyright (c) 2012 - 2016, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_PRINTF_H_
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#define FMT_PRINTF_H_
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#include <algorithm> // std::max
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#include <limits> // std::numeric_limits
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#include "ostream.h"
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FMT_BEGIN_NAMESPACE
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namespace internal {
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// Checks if a value fits in int - used to avoid warnings about comparing
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// signed and unsigned integers.
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template <bool IsSigned> struct int_checker {
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template <typename T> static bool fits_in_int(T value) {
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unsigned max = max_value<int>();
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return value <= max;
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}
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static bool fits_in_int(bool) { return true; }
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};
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template <> struct int_checker<true> {
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template <typename T> static bool fits_in_int(T value) {
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return value >= (std::numeric_limits<int>::min)() &&
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value <= max_value<int>();
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}
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static bool fits_in_int(int) { return true; }
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};
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class printf_precision_handler {
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public:
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
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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"));
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return (std::max)(static_cast<int>(value), 0);
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}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
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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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};
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// An argument visitor that returns true iff arg is a zero integer.
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class is_zero_int {
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public:
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
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bool operator()(T value) {
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return value == 0;
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}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
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bool operator()(T) {
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return false;
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}
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};
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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> { using type = bool; };
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template <typename T, typename Context> class arg_converter {
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private:
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using char_type = typename Context::char_type;
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basic_format_arg<Context>& arg_;
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char_type type_;
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public:
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arg_converter(basic_format_arg<Context>& arg, char_type type)
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: arg_(arg), type_(type) {}
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void operator()(bool value) {
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if (type_ != 's') operator()<bool>(value);
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}
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template <typename U, FMT_ENABLE_IF(std::is_integral<U>::value)>
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void operator()(U value) {
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bool is_signed = type_ == 'd' || type_ == 'i';
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using target_type = conditional_t<std::is_same<T, void>::value, U, T>;
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if (const_check(sizeof(target_type) <= sizeof(int))) {
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// Extra casts are used to silence warnings.
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if (is_signed) {
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arg_ = internal::make_arg<Context>(
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static_cast<int>(static_cast<target_type>(value)));
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} else {
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using unsigned_type = typename make_unsigned_or_bool<target_type>::type;
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arg_ = internal::make_arg<Context>(
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static_cast<unsigned>(static_cast<unsigned_type>(value)));
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}
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} else {
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if (is_signed) {
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// glibc's printf doesn't sign extend arguments of smaller types:
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// std::printf("%lld", -42); // prints "4294967254"
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// 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));
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} else {
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arg_ = internal::make_arg<Context>(
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static_cast<typename make_unsigned_or_bool<U>::type>(value));
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}
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}
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}
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template <typename U, FMT_ENABLE_IF(!std::is_integral<U>::value)>
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void operator()(U) {} // No conversion needed for non-integral types.
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};
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// Converts an integer argument to T for printf, if T is an integral type.
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// If T is void, the argument is converted to corresponding signed or unsigned
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// type depending on the type specifier: 'd' and 'i' - signed, other -
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// unsigned).
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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);
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}
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// Converts an integer argument to char for printf.
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template <typename Context> class char_converter {
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private:
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basic_format_arg<Context>& arg_;
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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)>
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void operator()(T value) {
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arg_ = internal::make_arg<Context>(
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static_cast<typename Context::char_type>(value));
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}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
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void operator()(T) {} // No conversion needed for non-integral types.
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};
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// Checks if an argument is a valid printf width specifier and sets
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// left alignment if it is negative.
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template <typename Char> class printf_width_handler {
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private:
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using format_specs = basic_format_specs<Char>;
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format_specs& specs_;
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public:
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explicit printf_width_handler(format_specs& specs) : specs_(specs) {}
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template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
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unsigned operator()(T value) {
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auto width = static_cast<uint32_or_64_or_128_t<T>>(value);
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if (internal::is_negative(value)) {
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specs_.align = align::left;
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width = 0 - width;
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}
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unsigned int_max = max_value<int>();
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if (width > int_max) FMT_THROW(format_error("number is too big"));
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return static_cast<unsigned>(width);
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}
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template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
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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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};
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template <typename Char, typename Context>
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void printf(buffer<Char>& buf, basic_string_view<Char> format,
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basic_format_args<Context> args) {
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Context(std::back_inserter(buf), format, args).format();
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}
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template <typename OutputIt, typename Char, typename Context>
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internal::truncating_iterator<OutputIt> printf(
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internal::truncating_iterator<OutputIt> it, basic_string_view<Char> format,
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basic_format_args<Context> args) {
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return Context(it, format, args).format();
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}
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} // 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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/**
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\rst
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The ``printf`` argument formatter.
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\endrst
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*/
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template <typename Range>
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class printf_arg_formatter : public internal::arg_formatter_base<Range> {
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public:
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using iterator = typename Range::iterator;
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private:
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using char_type = typename Range::value_type;
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using base = internal::arg_formatter_base<Range>;
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using context_type = basic_printf_context<iterator, char_type>;
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context_type& context_;
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void write_null_pointer(char) {
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this->specs()->type = 0;
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this->write("(nil)");
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}
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void write_null_pointer(wchar_t) {
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this->specs()->type = 0;
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this->write(L"(nil)");
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}
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public:
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using format_specs = typename base::format_specs;
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/**
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\rst
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Constructs an argument formatter object.
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*buffer* is a reference to the output buffer and *specs* contains format
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specifier information for standard argument types.
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\endrst
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*/
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printf_arg_formatter(iterator iter, format_specs& specs, context_type& ctx)
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: base(Range(iter), &specs, internal::locale_ref()), context_(ctx) {}
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template <typename T, FMT_ENABLE_IF(fmt::internal::is_integral<T>::value)>
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iterator operator()(T value) {
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// MSVC2013 fails to compile separate overloads for bool and char_type so
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// use std::is_same instead.
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if (std::is_same<T, bool>::value) {
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format_specs& fmt_specs = *this->specs();
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if (fmt_specs.type != 's') return base::operator()(value ? 1 : 0);
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fmt_specs.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_specs = *this->specs();
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if (fmt_specs.type && fmt_specs.type != 'c')
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return (*this)(static_cast<int>(value));
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fmt_specs.sign = sign::none;
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fmt_specs.alt = false;
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fmt_specs.align = align::right;
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return base::operator()(value);
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} else {
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return base::operator()(value);
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}
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return this->out();
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}
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template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
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iterator operator()(T value) {
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return base::operator()(value);
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}
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/** Formats a null-terminated C string. */
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iterator operator()(const char* value) {
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if (value)
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base::operator()(value);
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else if (this->specs()->type == 'p')
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write_null_pointer(char_type());
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else
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this->write("(null)");
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return this->out();
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}
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/** Formats a null-terminated wide C string. */
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iterator operator()(const wchar_t* value) {
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if (value)
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base::operator()(value);
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else if (this->specs()->type == 'p')
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write_null_pointer(char_type());
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else
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this->write(L"(null)");
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return this->out();
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}
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iterator operator()(basic_string_view<char_type> value) {
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return base::operator()(value);
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}
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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) {
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if (value) return base::operator()(value);
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this->specs()->type = 0;
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write_null_pointer(char_type());
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return this->out();
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}
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/** Formats an argument of a custom (user-defined) type. */
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iterator operator()(typename basic_format_arg<context_type>::handle handle) {
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handle.format(context_.parse_context(), context_);
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return this->out();
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}
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};
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template <typename T> struct printf_formatter {
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printf_formatter() = delete;
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template <typename ParseContext>
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auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
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return ctx.begin();
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}
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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);
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return ctx.out();
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}
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};
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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 {
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public:
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/** The character type for the output. */
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using char_type = Char;
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using iterator = OutputIt;
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using format_arg = basic_format_arg<basic_printf_context>;
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template <typename T> using formatter_type = printf_formatter<T>;
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private:
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using format_specs = basic_format_specs<char_type>;
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OutputIt out_;
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basic_format_args<basic_printf_context> args_;
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basic_format_parse_context<Char> parse_ctx_;
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static void parse_flags(format_specs& specs, const Char*& it,
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const Char* end);
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// Returns the argument with specified index or, if arg_index is -1, the next
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// argument.
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format_arg get_arg(int arg_index = -1);
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// Parses argument index, flags and width and returns the argument index.
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int parse_header(const Char*& it, const Char* end, format_specs& specs);
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public:
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/**
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\rst
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Constructs a ``printf_context`` object. References to the arguments and
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the writer are stored in the context object so make sure they have
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appropriate lifetimes.
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\endrst
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*/
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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) {}
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OutputIt out() { return out_; }
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void advance_to(OutputIt it) { out_ = it; }
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internal::locale_ref locale() { return {}; }
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format_arg arg(int id) const { return args_.get(id); }
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basic_format_parse_context<Char>& parse_context() { return parse_ctx_; }
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FMT_CONSTEXPR void on_error(const char* message) {
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parse_ctx_.on_error(message);
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}
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/** Formats stored arguments and writes the output to the range. */
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template <typename ArgFormatter = printf_arg_formatter<buffer_range<Char>>>
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OutputIt format();
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};
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template <typename OutputIt, typename Char>
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void basic_printf_context<OutputIt, Char>::parse_flags(format_specs& specs,
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const Char*& it,
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const Char* end) {
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for (; it != end; ++it) {
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switch (*it) {
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case '-':
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specs.align = align::left;
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break;
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case '+':
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specs.sign = sign::plus;
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break;
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case '0':
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specs.fill[0] = '0';
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break;
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case ' ':
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specs.sign = sign::space;
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break;
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case '#':
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specs.alt = true;
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break;
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default:
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return;
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}
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}
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}
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template <typename OutputIt, typename Char>
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typename basic_printf_context<OutputIt, Char>::format_arg
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basic_printf_context<OutputIt, Char>::get_arg(int arg_index) {
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if (arg_index < 0)
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arg_index = parse_ctx_.next_arg_id();
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else
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parse_ctx_.check_arg_id(--arg_index);
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return internal::get_arg(*this, arg_index);
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}
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template <typename OutputIt, typename Char>
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int basic_printf_context<OutputIt, Char>::parse_header(const Char*& it,
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const Char* end,
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format_specs& specs) {
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int arg_index = -1;
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char_type c = *it;
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if (c >= '0' && c <= '9') {
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// Parse an argument index (if followed by '$') or a width possibly
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// preceded with '0' flag(s).
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internal::error_handler eh;
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int value = parse_nonnegative_int(it, end, eh);
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if (it != end && *it == '$') { // value is an argument index
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++it;
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arg_index = value;
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} else {
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if (c == '0') specs.fill[0] = '0';
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if (value != 0) {
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// Nonzero value means that we parsed width and don't need to
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// parse it or flags again, so return now.
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specs.width = value;
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return arg_index;
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}
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}
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}
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parse_flags(specs, it, end);
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// Parse width.
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if (it != end) {
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if (*it >= '0' && *it <= '9') {
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internal::error_handler eh;
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specs.width = parse_nonnegative_int(it, end, eh);
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} else if (*it == '*') {
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++it;
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specs.width = static_cast<int>(visit_format_arg(
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internal::printf_width_handler<char_type>(specs), get_arg()));
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}
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}
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return arg_index;
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}
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template <typename OutputIt, typename Char>
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template <typename ArgFormatter>
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OutputIt basic_printf_context<OutputIt, Char>::format() {
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auto out = this->out();
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const Char* start = parse_ctx_.begin();
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const Char* end = parse_ctx_.end();
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auto it = start;
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while (it != end) {
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char_type c = *it++;
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if (c != '%') continue;
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if (it != end && *it == c) {
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out = std::copy(start, it, out);
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start = ++it;
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continue;
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}
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out = std::copy(start, it - 1, out);
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format_specs specs;
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specs.align = align::right;
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// Parse argument index, flags and width.
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int arg_index = parse_header(it, end, specs);
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if (arg_index == 0) on_error("argument index out of range");
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// Parse precision.
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if (it != end && *it == '.') {
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++it;
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c = it != end ? *it : 0;
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if ('0' <= c && c <= '9') {
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internal::error_handler eh;
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specs.precision = parse_nonnegative_int(it, end, eh);
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} else if (c == '*') {
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++it;
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specs.precision = static_cast<int>(
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visit_format_arg(internal::printf_precision_handler(), get_arg()));
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} else {
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specs.precision = 0;
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}
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}
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format_arg arg = get_arg(arg_index);
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if (specs.alt && visit_format_arg(internal::is_zero_int(), arg))
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specs.alt = false;
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if (specs.fill[0] == '0') {
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if (arg.is_arithmetic())
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specs.align = align::numeric;
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else
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specs.fill[0] = ' '; // Ignore '0' flag for non-numeric types.
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}
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// Parse length and convert the argument to the required type.
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c = it != end ? *it++ : 0;
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char_type t = it != end ? *it : 0;
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using internal::convert_arg;
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switch (c) {
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case 'h':
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if (t == 'h') {
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++it;
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t = it != end ? *it : 0;
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convert_arg<signed char>(arg, t);
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} 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.
|
|
if (it == end) FMT_THROW(format_error("invalid format string"));
|
|
specs.type = static_cast<char>(*it++);
|
|
if (arg.is_integral()) {
|
|
// Normalize type.
|
|
switch (specs.type) {
|
|
case 'i':
|
|
case 'u':
|
|
specs.type = 'd';
|
|
break;
|
|
case 'c':
|
|
visit_format_arg(internal::char_converter<basic_printf_context>(arg),
|
|
arg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
start = it;
|
|
|
|
// Format argument.
|
|
visit_format_arg(ArgFormatter(out, specs, *this), arg);
|
|
}
|
|
return std::copy(start, it, out);
|
|
}
|
|
|
|
template <typename Char>
|
|
using basic_printf_context_t =
|
|
basic_printf_context<std::back_insert_iterator<internal::buffer<Char>>,
|
|
Char>;
|
|
|
|
using printf_context = basic_printf_context_t<char>;
|
|
using wprintf_context = basic_printf_context_t<wchar_t>;
|
|
|
|
using printf_args = basic_format_args<printf_context>;
|
|
using wprintf_args = basic_format_args<wprintf_context>;
|
|
|
|
/**
|
|
\rst
|
|
Constructs an `~fmt::format_arg_store` object that contains references to
|
|
arguments and can be implicitly converted to `~fmt::printf_args`.
|
|
\endrst
|
|
*/
|
|
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
|
|
arguments and can be implicitly converted to `~fmt::wprintf_args`.
|
|
\endrst
|
|
*/
|
|
template <typename... Args>
|
|
inline format_arg_store<wprintf_context, Args...> make_wprintf_args(
|
|
const Args&... args) {
|
|
return {args...};
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline std::basic_string<Char> vsprintf(
|
|
const S& format,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args) {
|
|
basic_memory_buffer<Char> buffer;
|
|
printf(buffer, to_string_view(format), args);
|
|
return to_string(buffer);
|
|
}
|
|
|
|
/**
|
|
\rst
|
|
Formats arguments and returns the result as a string.
|
|
|
|
**Example**::
|
|
|
|
std::string message = fmt::sprintf("The answer is %d", 42);
|
|
\endrst
|
|
*/
|
|
template <typename S, typename... Args,
|
|
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 = basic_printf_context_t<Char>;
|
|
return vsprintf(to_string_view(format), make_format_args<context>(args...));
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline int vfprintf(
|
|
std::FILE* f, const S& format,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args) {
|
|
basic_memory_buffer<Char> buffer;
|
|
printf(buffer, to_string_view(format), args);
|
|
std::size_t size = buffer.size();
|
|
return std::fwrite(buffer.data(), sizeof(Char), size, f) < size
|
|
? -1
|
|
: static_cast<int>(size);
|
|
}
|
|
|
|
/**
|
|
\rst
|
|
Prints formatted data to the file *f*.
|
|
|
|
**Example**::
|
|
|
|
fmt::fprintf(stderr, "Don't %s!", "panic");
|
|
\endrst
|
|
*/
|
|
template <typename S, typename... Args,
|
|
typename Char = enable_if_t<internal::is_string<S>::value, char_t<S>>>
|
|
inline int fprintf(std::FILE* f, const S& format, const Args&... args) {
|
|
using context = basic_printf_context_t<Char>;
|
|
return vfprintf(f, to_string_view(format),
|
|
make_format_args<context>(args...));
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline int vprintf(
|
|
const S& format,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> 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
|
|
*/
|
|
template <typename S, typename... Args,
|
|
FMT_ENABLE_IF(internal::is_string<S>::value)>
|
|
inline int printf(const S& format_str, const Args&... args) {
|
|
using context = basic_printf_context_t<char_t<S>>;
|
|
return vprintf(to_string_view(format_str),
|
|
make_format_args<context>(args...));
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline int vfprintf(
|
|
std::basic_ostream<Char>& os, const S& format,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> 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,
|
|
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<type_identity_t<Context>> args) {
|
|
typename ArgFormatter::iterator iter(out);
|
|
Context(iter, format_str, args).template format<ArgFormatter>();
|
|
return iter;
|
|
}
|
|
|
|
/**
|
|
\rst
|
|
Prints formatted data to the stream *os*.
|
|
|
|
**Example**::
|
|
|
|
fmt::fprintf(cerr, "Don't %s!", "panic");
|
|
\endrst
|
|
*/
|
|
template <typename S, typename... Args, typename Char = char_t<S>>
|
|
inline int fprintf(std::basic_ostream<Char>& os, const S& format_str,
|
|
const Args&... args) {
|
|
using context = basic_printf_context_t<Char>;
|
|
return vfprintf(os, to_string_view(format_str),
|
|
make_format_args<context>(args...));
|
|
}
|
|
FMT_END_NAMESPACE
|
|
|
|
#endif // FMT_PRINTF_H_
|