e37d6a9840
* add make_printf_args and make_wprintf_args to printf.h add minimal test for make_printf_args and make_wprintf_args to printf-test.cc renamed the old printf_context template to basic_printf_context_t. the original wish was to rename it basic_printf_context, but that clashed with the name of the inner typedef. this style matches the format_context_t struct.
729 lines
22 KiB
C++
729 lines
22 KiB
C++
// Formatting library for C++
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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::fill_n
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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>
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struct int_checker {
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template <typename T>
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static bool fits_in_int(T value) {
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unsigned max = std::numeric_limits<int>::max();
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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 <>
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struct int_checker<true> {
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template <typename T>
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static bool fits_in_int(T value) {
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return value >= std::numeric_limits<int>::min() &&
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value <= std::numeric_limits<int>::max();
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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: public function<int> {
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public:
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, int>::type
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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 static_cast<int>(value);
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}
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template <typename T>
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typename std::enable_if<!std::is_integral<T>::value, int>::type 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: public function<bool> {
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public:
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, bool>::type
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operator()(T value) { return value == 0; }
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template <typename T>
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typename std::enable_if<!std::is_integral<T>::value, bool>::type
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operator()(T) { return false; }
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};
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template <typename T>
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struct make_unsigned_or_bool : std::make_unsigned<T> {};
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template <>
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struct make_unsigned_or_bool<bool> {
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typedef bool type;
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};
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template <typename T, typename Context>
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class arg_converter: public function<void> {
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private:
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typedef typename Context::char_type Char;
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basic_format_arg<Context> &arg_;
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typename Context::char_type type_;
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public:
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arg_converter(basic_format_arg<Context> &arg, Char type)
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: arg_(arg), type_(type) {}
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void operator()(bool value) {
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if (type_ != 's')
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operator()<bool>(value);
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}
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template <typename U>
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typename std::enable_if<std::is_integral<U>::value>::type
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operator()(U value) {
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bool is_signed = type_ == 'd' || type_ == 'i';
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typedef typename std::conditional<
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std::is_same<T, void>::value, U, T>::type TargetType;
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if (const_check(sizeof(TargetType) <= 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<TargetType>(value)));
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} else {
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typedef typename make_unsigned_or_bool<TargetType>::type Unsigned;
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arg_ = internal::make_arg<Context>(
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static_cast<unsigned>(static_cast<Unsigned>(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>
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typename std::enable_if<!std::is_integral<U>::value>::type operator()(U) {
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// No coversion needed for non-integral types.
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}
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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>
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class char_converter: public function<void> {
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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>
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typename std::enable_if<std::is_integral<T>::value>::type
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operator()(T value) {
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typedef typename Context::char_type Char;
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arg_ = internal::make_arg<Context>(static_cast<Char>(value));
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}
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template <typename T>
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typename std::enable_if<!std::is_integral<T>::value>::type operator()(T) {
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// No coversion needed for non-integral types.
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}
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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>
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class printf_width_handler: public function<unsigned> {
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private:
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typedef basic_format_specs<Char> format_specs;
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format_specs &spec_;
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public:
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explicit printf_width_handler(format_specs &spec) : spec_(spec) {}
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, unsigned>::type
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operator()(T value) {
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typedef typename internal::int_traits<T>::main_type UnsignedType;
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UnsignedType width = static_cast<UnsignedType>(value);
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if (internal::is_negative(value)) {
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spec_.align_ = ALIGN_LEFT;
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width = 0 - width;
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}
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unsigned int_max = std::numeric_limits<int>::max();
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if (width > int_max)
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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>
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typename std::enable_if<!std::is_integral<T>::value, unsigned>::type
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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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} // namespace internal
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template <typename Range>
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class printf_arg_formatter;
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template <
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typename OutputIt, typename Char,
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typename ArgFormatter =
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printf_arg_formatter<back_insert_range<internal::basic_buffer<Char>>>>
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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:
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public internal::function<
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typename internal::arg_formatter_base<Range>::iterator>,
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public internal::arg_formatter_base<Range> {
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private:
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typedef typename Range::value_type char_type;
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typedef decltype(internal::declval<Range>().begin()) iterator;
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typedef internal::arg_formatter_base<Range> base;
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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) {
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this->spec()->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->spec()->type = 0;
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this->write(L"(nil)");
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}
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public:
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typedef typename base::format_specs 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 *spec* 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(internal::basic_buffer<char_type> &buffer,
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format_specs &spec, context_type &ctx)
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: base(back_insert_range<internal::basic_buffer<char_type>>(buffer), &spec,
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ctx.locale()),
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context_(ctx) {}
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, iterator>::type
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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_spec = *this->spec();
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if (fmt_spec.type != 's')
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return base::operator()(value ? 1 : 0);
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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();
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if (fmt_spec.type && fmt_spec.type != 'c')
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return (*this)(static_cast<int>(value));
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fmt_spec.flags = 0;
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fmt_spec.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>
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typename std::enable_if<std::is_floating_point<T>::value, iterator>::type
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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->spec()->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->spec()->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) {
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return base::operator()(value);
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}
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/** Formats a pointer. */
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iterator operator()(const void *value) {
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if (value)
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return base::operator()(value);
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this->spec()->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_);
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return this->out();
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}
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};
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template <typename T>
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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);
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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, typename ArgFormatter>
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class basic_printf_context :
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// Inherit publicly as a workaround for the icc bug
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// https://software.intel.com/en-us/forums/intel-c-compiler/topic/783476.
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public internal::context_base<
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OutputIt, basic_printf_context<OutputIt, Char, ArgFormatter>, Char> {
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public:
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/** The character type for the output. */
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typedef Char char_type;
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template <typename T>
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struct formatter_type { typedef printf_formatter<T> type; };
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private:
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typedef internal::context_base<OutputIt, basic_printf_context, Char> base;
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typedef typename base::format_arg format_arg;
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typedef basic_format_specs<char_type> format_specs;
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typedef internal::null_terminating_iterator<char_type> iterator;
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void parse_flags(format_specs &spec, iterator &it);
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// Returns the argument with specified index or, if arg_index is equal
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// to the maximum unsigned value, the next argument.
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format_arg get_arg(
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iterator it,
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unsigned arg_index = (std::numeric_limits<unsigned>::max)());
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// Parses argument index, flags and width and returns the argument index.
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unsigned parse_header(iterator &it, format_specs &spec);
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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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: base(out, format_str, args) {}
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using base::parse_context;
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using base::out;
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using base::advance_to;
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/** Formats stored arguments and writes the output to the range. */
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void format();
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};
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template <typename OutputIt, typename Char, typename AF>
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void basic_printf_context<OutputIt, Char, AF>::parse_flags(
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format_specs &spec, iterator &it) {
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for (;;) {
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switch (*it++) {
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case '-':
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spec.align_ = ALIGN_LEFT;
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break;
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case '+':
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spec.flags |= SIGN_FLAG | PLUS_FLAG;
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break;
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case '0':
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spec.fill_ = '0';
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break;
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case ' ':
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spec.flags |= SIGN_FLAG;
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break;
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case '#':
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spec.flags |= HASH_FLAG;
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break;
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default:
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--it;
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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, typename AF>
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typename basic_printf_context<OutputIt, Char, AF>::format_arg
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basic_printf_context<OutputIt, Char, AF>::get_arg(
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iterator it, unsigned arg_index) {
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(void)it;
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if (arg_index == std::numeric_limits<unsigned>::max())
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return this->do_get_arg(this->parse_context().next_arg_id());
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return base::get_arg(arg_index - 1);
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}
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template <typename OutputIt, typename Char, typename AF>
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unsigned basic_printf_context<OutputIt, Char, AF>::parse_header(
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iterator &it, format_specs &spec) {
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unsigned arg_index = std::numeric_limits<unsigned>::max();
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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 '$') or a width possibly
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// preceded with '0' flag(s).
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internal::error_handler eh;
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unsigned value = parse_nonnegative_int(it, eh);
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if (*it == '$') { // 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')
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spec.fill_ = '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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spec.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(spec, it);
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// Parse width.
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if (*it >= '0' && *it <= '9') {
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internal::error_handler eh;
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spec.width_ = parse_nonnegative_int(it, eh);
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} else if (*it == '*') {
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++it;
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spec.width_ = visit_format_arg(
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internal::printf_width_handler<char_type>(spec), get_arg(it));
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}
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return arg_index;
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}
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template <typename OutputIt, typename Char, typename AF>
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void basic_printf_context<OutputIt, Char, AF>::format() {
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auto &buffer = internal::get_container(this->out());
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auto start = iterator(this->parse_context());
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auto it = start;
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using internal::pointer_from;
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while (*it) {
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char_type c = *it++;
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if (c != '%') continue;
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if (*it == c) {
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buffer.append(pointer_from(start), pointer_from(it));
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start = ++it;
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continue;
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}
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buffer.append(pointer_from(start), pointer_from(it) - 1);
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format_specs spec;
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spec.align_ = ALIGN_RIGHT;
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// Parse argument index, flags and width.
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unsigned arg_index = parse_header(it, spec);
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// Parse precision.
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if (*it == '.') {
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++it;
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if ('0' <= *it && *it <= '9') {
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internal::error_handler eh;
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spec.precision = static_cast<int>(parse_nonnegative_int(it, eh));
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} else if (*it == '*') {
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++it;
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spec.precision =
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visit_format_arg(internal::printf_precision_handler(), get_arg(it));
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} else {
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spec.precision = 0;
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}
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}
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format_arg arg = get_arg(it, arg_index);
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if (spec.has(HASH_FLAG) && visit_format_arg(internal::is_zero_int(), arg))
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spec.flags &= ~internal::to_unsigned<int>(HASH_FLAG);
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if (spec.fill_ == '0') {
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if (arg.is_arithmetic())
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spec.align_ = ALIGN_NUMERIC;
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else
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spec.fill_ = ' '; // 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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using internal::convert_arg;
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switch (*it++) {
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case 'h':
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if (*it == 'h')
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convert_arg<signed char>(arg, *++it);
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else
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convert_arg<short>(arg, *it);
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break;
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case 'l':
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if (*it == 'l')
|
|
convert_arg<long long>(arg, *++it);
|
|
else
|
|
convert_arg<long>(arg, *it);
|
|
break;
|
|
case 'j':
|
|
convert_arg<intmax_t>(arg, *it);
|
|
break;
|
|
case 'z':
|
|
convert_arg<std::size_t>(arg, *it);
|
|
break;
|
|
case 't':
|
|
convert_arg<std::ptrdiff_t>(arg, *it);
|
|
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, *it);
|
|
}
|
|
|
|
// Parse type.
|
|
if (!*it)
|
|
FMT_THROW(format_error("invalid format string"));
|
|
spec.type = static_cast<char>(*it++);
|
|
if (arg.is_integral()) {
|
|
// Normalize type.
|
|
switch (spec.type) {
|
|
case 'i': case 'u':
|
|
spec.type = 'd';
|
|
break;
|
|
case 'c':
|
|
// TODO: handle wchar_t better?
|
|
visit_format_arg(
|
|
internal::char_converter<basic_printf_context>(arg), arg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
start = it;
|
|
|
|
// Format argument.
|
|
visit_format_arg(AF(buffer, spec, *this), arg);
|
|
}
|
|
buffer.append(pointer_from(start), pointer_from(it));
|
|
}
|
|
|
|
template <typename Char, typename Context>
|
|
void printf(internal::basic_buffer<Char> &buf, basic_string_view<Char> format,
|
|
basic_format_args<Context> args) {
|
|
Context(std::back_inserter(buf), format, args).format();
|
|
}
|
|
|
|
template <typename Buffer>
|
|
struct basic_printf_context_t {
|
|
typedef basic_printf_context<
|
|
std::back_insert_iterator<Buffer>, typename Buffer::value_type> type;
|
|
};
|
|
|
|
typedef basic_printf_context_t<internal::buffer>::type printf_context;
|
|
typedef basic_printf_context_t<internal::wbuffer>::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
|
|
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 = FMT_CHAR(S)>
|
|
inline std::basic_string<Char>
|
|
vsprintf(const S &format,
|
|
basic_format_args<typename basic_printf_context_t<
|
|
internal::basic_buffer<Char>>::type> 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>
|
|
inline FMT_ENABLE_IF_STRING(S, std::basic_string<FMT_CHAR(S)>)
|
|
sprintf(const S &format, const Args & ... args) {
|
|
internal::check_format_string<Args...>(format);
|
|
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
|
|
typedef typename basic_printf_context_t<buffer>::type context;
|
|
format_arg_store<context, Args...> as{ args... };
|
|
return vsprintf(to_string_view(format),
|
|
basic_format_args<context>(as));
|
|
}
|
|
|
|
template <typename S, typename Char = FMT_CHAR(S)>
|
|
inline int vfprintf(std::FILE *f, const S &format,
|
|
basic_format_args<typename basic_printf_context_t<
|
|
internal::basic_buffer<Char>>::type> 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>
|
|
inline FMT_ENABLE_IF_STRING(S, int)
|
|
fprintf(std::FILE *f, const S &format, const Args & ... args) {
|
|
internal::check_format_string<Args...>(format);
|
|
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
|
|
typedef typename basic_printf_context_t<buffer>::type context;
|
|
format_arg_store<context, Args...> as{ args... };
|
|
return vfprintf(f, to_string_view(format),
|
|
basic_format_args<context>(as));
|
|
}
|
|
|
|
template <typename S, typename Char = FMT_CHAR(S)>
|
|
inline int vprintf(const S &format,
|
|
basic_format_args<typename basic_printf_context_t<
|
|
internal::basic_buffer<Char>>::type> 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>
|
|
inline FMT_ENABLE_IF_STRING(S, int)
|
|
printf(const S &format_str, const Args & ... args) {
|
|
internal::check_format_string<Args...>(format_str);
|
|
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
|
|
typedef typename basic_printf_context_t<buffer>::type context;
|
|
format_arg_store<context, Args...> as{ args... };
|
|
return vprintf(to_string_view(format_str),
|
|
basic_format_args<context>(as));
|
|
}
|
|
|
|
template <typename S, typename Char = FMT_CHAR(S)>
|
|
inline int vfprintf(std::basic_ostream<Char> &os,
|
|
const S &format,
|
|
basic_format_args<typename basic_printf_context_t<
|
|
internal::basic_buffer<Char>>::type> args) {
|
|
basic_memory_buffer<Char> buffer;
|
|
printf(buffer, to_string_view(format), args);
|
|
internal::write(os, buffer);
|
|
return static_cast<int>(buffer.size());
|
|
}
|
|
|
|
/**
|
|
\rst
|
|
Prints formatted data to the stream *os*.
|
|
|
|
**Example**::
|
|
|
|
fmt::fprintf(cerr, "Don't %s!", "panic");
|
|
\endrst
|
|
*/
|
|
template <typename S, typename... Args>
|
|
inline FMT_ENABLE_IF_STRING(S, int)
|
|
fprintf(std::basic_ostream<FMT_CHAR(S)> &os,
|
|
const S &format_str, const Args & ... args) {
|
|
internal::check_format_string<Args...>(format_str);
|
|
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
|
|
typedef typename basic_printf_context_t<buffer>::type context;
|
|
format_arg_store<context, Args...> as{ args... };
|
|
return vfprintf(os, to_string_view(format_str),
|
|
basic_format_args<context>(as));
|
|
}
|
|
FMT_END_NAMESPACE
|
|
|
|
#endif // FMT_PRINTF_H_
|