641 lines
20 KiB
C++
641 lines
20 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 "format.h"
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FMT_BEGIN_NAMESPACE
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FMT_MODULE_EXPORT_BEGIN
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template <typename T> struct printf_formatter { printf_formatter() = delete; };
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template <typename Char>
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class basic_printf_parse_context : public basic_format_parse_context<Char> {
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using basic_format_parse_context<Char>::basic_format_parse_context;
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};
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template <typename OutputIt, typename Char> class basic_printf_context {
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private:
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OutputIt out_;
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basic_format_args<basic_printf_context> args_;
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public:
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using char_type = Char;
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using format_arg = basic_format_arg<basic_printf_context>;
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using parse_context_type = basic_printf_parse_context<Char>;
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template <typename T> using formatter_type = printf_formatter<T>;
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/**
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\rst
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Constructs a ``printf_context`` object. References to the arguments are
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stored in the context object so make sure they have appropriate lifetimes.
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\endrst
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*/
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basic_printf_context(OutputIt out,
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basic_format_args<basic_printf_context> args)
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: out_(out), args_(args) {}
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OutputIt out() { return out_; }
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void advance_to(OutputIt it) { out_ = it; }
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detail::locale_ref locale() { return {}; }
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format_arg arg(int id) const { return args_.get(id); }
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FMT_CONSTEXPR void on_error(const char* message) {
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detail::error_handler().on_error(message);
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}
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};
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FMT_BEGIN_DETAIL_NAMESPACE
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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_ = detail::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_ = detail::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_ = detail::make_arg<Context>(static_cast<long long>(value));
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} else {
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arg_ = detail::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_ = detail::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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// An argument visitor that return a pointer to a C string if argument is a
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// string or null otherwise.
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template <typename Char> struct get_cstring {
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template <typename T> const Char* operator()(T) { return nullptr; }
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const Char* operator()(const Char* s) { return s; }
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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 (detail::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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// The ``printf`` argument formatter.
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template <typename OutputIt, typename Char>
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class printf_arg_formatter : public arg_formatter<Char> {
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private:
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using base = arg_formatter<Char>;
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using context_type = basic_printf_context<OutputIt, Char>;
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using format_specs = basic_format_specs<Char>;
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context_type& context_;
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OutputIt write_null_pointer(bool is_string = false) {
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auto s = this->specs;
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s.type = presentation_type::none;
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return write_bytes(this->out, is_string ? "(null)" : "(nil)", s);
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}
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public:
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printf_arg_formatter(OutputIt iter, format_specs& s, context_type& ctx)
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: base{iter, s, locale_ref()}, context_(ctx) {}
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OutputIt operator()(monostate value) { return base::operator()(value); }
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template <typename T, FMT_ENABLE_IF(detail::is_integral<T>::value)>
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OutputIt operator()(T value) {
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// MSVC2013 fails to compile separate overloads for bool and Char so use
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// std::is_same instead.
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if (std::is_same<T, Char>::value) {
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format_specs fmt_specs = this->specs;
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if (fmt_specs.type != presentation_type::none &&
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fmt_specs.type != presentation_type::chr) {
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return (*this)(static_cast<int>(value));
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}
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fmt_specs.sign = sign::none;
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fmt_specs.alt = false;
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fmt_specs.fill[0] = ' '; // Ignore '0' flag for char types.
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// align::numeric needs to be overwritten here since the '0' flag is
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// ignored for non-numeric types
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if (fmt_specs.align == align::none || fmt_specs.align == align::numeric)
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fmt_specs.align = align::right;
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return write<Char>(this->out, static_cast<Char>(value), fmt_specs);
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}
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return base::operator()(value);
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}
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template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
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OutputIt 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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OutputIt operator()(const char* value) {
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if (value) return base::operator()(value);
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return write_null_pointer(this->specs.type != presentation_type::pointer);
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}
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/** Formats a null-terminated wide C string. */
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OutputIt operator()(const wchar_t* value) {
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if (value) return base::operator()(value);
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return write_null_pointer(this->specs.type != presentation_type::pointer);
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}
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OutputIt operator()(basic_string_view<Char> value) {
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return base::operator()(value);
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}
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/** Formats a pointer. */
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OutputIt operator()(const void* value) {
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return value ? base::operator()(value) : write_null_pointer();
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}
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/** Formats an argument of a custom (user-defined) type. */
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OutputIt operator()(typename basic_format_arg<context_type>::handle handle) {
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auto parse_ctx =
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basic_printf_parse_context<Char>(basic_string_view<Char>());
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handle.format(parse_ctx, context_);
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return this->out;
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}
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};
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template <typename Char>
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void parse_flags(basic_format_specs<Char>& specs, 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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if (specs.sign != sign::plus) {
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specs.sign = sign::space;
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}
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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 Char, typename GetArg>
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int parse_header(const Char*& it, const Char* end,
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basic_format_specs<Char>& specs, GetArg get_arg) {
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int arg_index = -1;
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Char c = *it;
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if (c >= '0' && c <= '9') {
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// Parse an argument index (if followed by '$') or a width possibly
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// preceded with '0' flag(s).
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int value = parse_nonnegative_int(it, end, -1);
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if (it != end && *it == '$') { // value is an argument index
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++it;
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arg_index = value != -1 ? value : max_value<int>();
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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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if (value == -1) FMT_THROW(format_error("number is too big"));
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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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specs.width = parse_nonnegative_int(it, end, -1);
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if (specs.width == -1) FMT_THROW(format_error("number is too big"));
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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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detail::printf_width_handler<Char>(specs), get_arg(-1)));
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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 Char, typename Context>
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void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
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basic_format_args<Context> args) {
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using OutputIt = buffer_appender<Char>;
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auto out = OutputIt(buf);
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auto context = basic_printf_context<OutputIt, Char>(out, args);
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auto parse_ctx = basic_printf_parse_context<Char>(format);
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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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auto 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 detail::get_arg(context, arg_index);
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};
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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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if (!detail::find<false, Char>(it, end, '%', it)) {
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it = end; // detail::find leaves it == nullptr if it doesn't find '%'
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break;
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}
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Char c = *it++;
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if (it != end && *it == c) {
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out = detail::write(
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out, basic_string_view<Char>(start, detail::to_unsigned(it - start)));
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start = ++it;
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continue;
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}
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out = detail::write(out, basic_string_view<Char>(
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start, detail::to_unsigned(it - 1 - start)));
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basic_format_specs<Char> 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, get_arg);
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if (arg_index == 0) parse_ctx.on_error("argument not found");
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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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specs.precision = parse_nonnegative_int(it, end, 0);
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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(detail::printf_precision_handler(), get_arg(-1)));
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} else {
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specs.precision = 0;
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}
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}
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auto arg = get_arg(arg_index);
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// For d, i, o, u, x, and X conversion specifiers, if a precision is
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// specified, the '0' flag is ignored
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if (specs.precision >= 0 && arg.is_integral())
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specs.fill[0] =
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' '; // Ignore '0' flag for non-numeric types or if '-' present.
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if (specs.precision >= 0 && arg.type() == detail::type::cstring_type) {
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auto str = visit_format_arg(detail::get_cstring<Char>(), arg);
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auto str_end = str + specs.precision;
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auto nul = std::find(str, str_end, Char());
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arg = detail::make_arg<basic_printf_context<OutputIt, Char>>(
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basic_string_view<Char>(
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str, detail::to_unsigned(nul != str_end ? nul - str
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: specs.precision)));
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}
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if (specs.alt && visit_format_arg(detail::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() && specs.align != align::left)
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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 or if '-'
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// flag is also present.
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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 t = it != end ? *it : 0;
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using detail::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 {
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convert_arg<short>(arg, t);
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}
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break;
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case 'l':
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if (t == 'l') {
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++it;
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t = it != end ? *it : 0;
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convert_arg<long long>(arg, t);
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} else {
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convert_arg<long>(arg, t);
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}
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break;
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case 'j':
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convert_arg<intmax_t>(arg, t);
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break;
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case 'z':
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convert_arg<size_t>(arg, t);
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break;
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case 't':
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convert_arg<std::ptrdiff_t>(arg, t);
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break;
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case 'L':
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// printf produces garbage when 'L' is omitted for long double, no
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// need to do the same.
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break;
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default:
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--it;
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convert_arg<void>(arg, c);
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}
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// Parse type.
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if (it == end) FMT_THROW(format_error("invalid format string"));
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char type = static_cast<char>(*it++);
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if (arg.is_integral()) {
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// Normalize type.
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|
switch (type) {
|
|
case 'i':
|
|
case 'u':
|
|
type = 'd';
|
|
break;
|
|
case 'c':
|
|
visit_format_arg(
|
|
detail::char_converter<basic_printf_context<OutputIt, Char>>(arg),
|
|
arg);
|
|
break;
|
|
}
|
|
}
|
|
specs.type = parse_presentation_type(type);
|
|
if (specs.type == presentation_type::none)
|
|
parse_ctx.on_error("invalid type specifier");
|
|
|
|
start = it;
|
|
|
|
// Format argument.
|
|
out = visit_format_arg(
|
|
detail::printf_arg_formatter<OutputIt, Char>(out, specs, context), arg);
|
|
}
|
|
detail::write(out, basic_string_view<Char>(start, to_unsigned(it - start)));
|
|
}
|
|
FMT_END_DETAIL_NAMESPACE
|
|
|
|
template <typename Char>
|
|
using basic_printf_context_t =
|
|
basic_printf_context<detail::buffer_appender<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... T>
|
|
inline auto make_printf_args(const T&... args)
|
|
-> format_arg_store<printf_context, T...> {
|
|
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... T>
|
|
inline auto make_wprintf_args(const T&... args)
|
|
-> format_arg_store<wprintf_context, T...> {
|
|
return {args...};
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline auto vsprintf(
|
|
const S& fmt,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args)
|
|
-> std::basic_string<Char> {
|
|
basic_memory_buffer<Char> buffer;
|
|
vprintf(buffer, detail::to_string_view(fmt), 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... T,
|
|
typename Char = enable_if_t<detail::is_string<S>::value, char_t<S>>>
|
|
inline auto sprintf(const S& fmt, const T&... args) -> std::basic_string<Char> {
|
|
using context = basic_printf_context_t<Char>;
|
|
return vsprintf(detail::to_string_view(fmt),
|
|
fmt::make_format_args<context>(args...));
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline auto vfprintf(
|
|
std::FILE* f, const S& fmt,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args)
|
|
-> int {
|
|
basic_memory_buffer<Char> buffer;
|
|
vprintf(buffer, detail::to_string_view(fmt), args);
|
|
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... T, typename Char = char_t<S>>
|
|
inline auto fprintf(std::FILE* f, const S& fmt, const T&... args) -> int {
|
|
using context = basic_printf_context_t<Char>;
|
|
return vfprintf(f, detail::to_string_view(fmt),
|
|
fmt::make_format_args<context>(args...));
|
|
}
|
|
|
|
template <typename S, typename Char = char_t<S>>
|
|
inline auto vprintf(
|
|
const S& fmt,
|
|
basic_format_args<basic_printf_context_t<type_identity_t<Char>>> args)
|
|
-> int {
|
|
return vfprintf(stdout, detail::to_string_view(fmt), args);
|
|
}
|
|
|
|
/**
|
|
\rst
|
|
Prints formatted data to ``stdout``.
|
|
|
|
**Example**::
|
|
|
|
fmt::printf("Elapsed time: %.2f seconds", 1.23);
|
|
\endrst
|
|
*/
|
|
template <typename S, typename... T, FMT_ENABLE_IF(detail::is_string<S>::value)>
|
|
inline auto printf(const S& fmt, const T&... args) -> int {
|
|
return vprintf(
|
|
detail::to_string_view(fmt),
|
|
fmt::make_format_args<basic_printf_context_t<char_t<S>>>(args...));
|
|
}
|
|
|
|
FMT_MODULE_EXPORT_END
|
|
FMT_END_NAMESPACE
|
|
|
|
#endif // FMT_PRINTF_H_
|