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+/*
+ Formatting library for C++
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#ifndef FMT_PRINTF_H_
+#define FMT_PRINTF_H_
+
+#include <algorithm> // std::fill_n
+#include <limits> // std::numeric_limits
+
+#include "ostream.h"
+
+namespace fmt {
+namespace internal {
+
+// Checks if a value fits in int - used to avoid warnings about comparing
+// signed and unsigned integers.
+template<bool IsSigned>
+struct IntChecker
+{
+ template<typename T>
+ static bool fits_in_int(T value)
+ {
+ unsigned max = std::numeric_limits<int>::max();
+ return value <= max;
+ }
+ static bool fits_in_int(bool)
+ {
+ return true;
+ }
+};
+
+template<>
+struct IntChecker<true>
+{
+ template<typename T>
+ static bool fits_in_int(T value)
+ {
+ return value >= std::numeric_limits<int>::min() && value <= std::numeric_limits<int>::max();
+ }
+ static bool fits_in_int(int)
+ {
+ return true;
+ }
+};
+
+class PrecisionHandler : public ArgVisitor<PrecisionHandler, int>
+{
+public:
+ void report_unhandled_arg()
+ {
+ FMT_THROW(FormatError("precision is not integer"));
+ }
+
+ template<typename T>
+ int visit_any_int(T value)
+ {
+ if (!IntChecker<std::numeric_limits<T>::is_signed>::fits_in_int(value))
+ FMT_THROW(FormatError("number is too big"));
+ return static_cast<int>(value);
+ }
+};
+
+// IsZeroInt::visit(arg) returns true iff arg is a zero integer.
+class IsZeroInt : public ArgVisitor<IsZeroInt, bool>
+{
+public:
+ template<typename T>
+ bool visit_any_int(T value)
+ {
+ return value == 0;
+ }
+};
+
+// returns the default type for format specific "%s"
+class DefaultType : public ArgVisitor<DefaultType, char>
+{
+public:
+ char visit_char(int)
+ {
+ return 'c';
+ }
+
+ char visit_bool(bool)
+ {
+ return 's';
+ }
+
+ char visit_pointer(const void *)
+ {
+ return 'p';
+ }
+
+ template<typename T>
+ char visit_any_int(T)
+ {
+ return 'd';
+ }
+
+ template<typename T>
+ char visit_any_double(T)
+ {
+ return 'g';
+ }
+
+ char visit_unhandled_arg()
+ {
+ return 's';
+ }
+};
+
+template<typename T, typename U>
+struct is_same
+{
+ enum
+ {
+ value = 0
+ };
+};
+
+template<typename T>
+struct is_same<T, T>
+{
+ enum
+ {
+ value = 1
+ };
+};
+
+// An argument visitor that converts an integer argument to T for printf,
+// if T is an integral type. If T is void, the argument is converted to
+// corresponding signed or unsigned type depending on the type specifier:
+// 'd' and 'i' - signed, other - unsigned)
+template<typename T = void>
+class ArgConverter : public ArgVisitor<ArgConverter<T>, void>
+{
+private:
+ internal::Arg &arg_;
+ wchar_t type_;
+
+ FMT_DISALLOW_COPY_AND_ASSIGN(ArgConverter);
+
+public:
+ ArgConverter(internal::Arg &arg, wchar_t type)
+ : arg_(arg)
+ , type_(type)
+ {
+ }
+
+ void visit_bool(bool value)
+ {
+ if (type_ != 's')
+ visit_any_int(value);
+ }
+
+ void visit_char(int value)
+ {
+ if (type_ != 's')
+ visit_any_int(value);
+ }
+
+ template<typename U>
+ void visit_any_int(U value)
+ {
+ bool is_signed = type_ == 'd' || type_ == 'i';
+ if (type_ == 's')
+ {
+ is_signed = std::numeric_limits<U>::is_signed;
+ }
+
+ using internal::Arg;
+ typedef typename internal::Conditional<is_same<T, void>::value, U, T>::type TargetType;
+ if (const_check(sizeof(TargetType) <= sizeof(int)))
+ {
+ // Extra casts are used to silence warnings.
+ if (is_signed)
+ {
+ arg_.type = Arg::INT;
+ arg_.int_value = static_cast<int>(static_cast<TargetType>(value));
+ }
+ else
+ {
+ arg_.type = Arg::UINT;
+ typedef typename internal::MakeUnsigned<TargetType>::Type Unsigned;
+ arg_.uint_value = static_cast<unsigned>(static_cast<Unsigned>(value));
+ }
+ }
+ else
+ {
+ if (is_signed)
+ {
+ arg_.type = Arg::LONG_LONG;
+ // glibc's printf doesn't sign extend arguments of smaller types:
+ // std::printf("%lld", -42); // prints "4294967254"
+ // but we don't have to do the same because it's a UB.
+ arg_.long_long_value = static_cast<LongLong>(value);
+ }
+ else
+ {
+ arg_.type = Arg::ULONG_LONG;
+ arg_.ulong_long_value = static_cast<typename internal::MakeUnsigned<U>::Type>(value);
+ }
+ }
+ }
+};
+
+// Converts an integer argument to char for printf.
+class CharConverter : public ArgVisitor<CharConverter, void>
+{
+private:
+ internal::Arg &arg_;
+
+ FMT_DISALLOW_COPY_AND_ASSIGN(CharConverter);
+
+public:
+ explicit CharConverter(internal::Arg &arg)
+ : arg_(arg)
+ {
+ }
+
+ template<typename T>
+ void visit_any_int(T value)
+ {
+ arg_.type = internal::Arg::CHAR;
+ arg_.int_value = static_cast<char>(value);
+ }
+};
+
+// Checks if an argument is a valid printf width specifier and sets
+// left alignment if it is negative.
+class WidthHandler : public ArgVisitor<WidthHandler, unsigned>
+{
+private:
+ FormatSpec &spec_;
+
+ FMT_DISALLOW_COPY_AND_ASSIGN(WidthHandler);
+
+public:
+ explicit WidthHandler(FormatSpec &spec)
+ : spec_(spec)
+ {
+ }
+
+ void report_unhandled_arg()
+ {
+ FMT_THROW(FormatError("width is not integer"));
+ }
+
+ template<typename T>
+ unsigned visit_any_int(T value)
+ {
+ typedef typename internal::IntTraits<T>::MainType UnsignedType;
+ UnsignedType width = static_cast<UnsignedType>(value);
+ if (internal::is_negative(value))
+ {
+ spec_.align_ = ALIGN_LEFT;
+ width = 0 - width;
+ }
+ unsigned int_max = std::numeric_limits<int>::max();
+ if (width > int_max)
+ FMT_THROW(FormatError("number is too big"));
+ return static_cast<unsigned>(width);
+ }
+};
+} // namespace internal
+
+/**
+ \rst
+ A ``printf`` argument formatter based on the `curiously recurring template
+ pattern <http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern>`_.
+
+ To use `~fmt::BasicPrintfArgFormatter` define a subclass that implements some
+ or all of the visit methods with the same signatures as the methods in
+ `~fmt::ArgVisitor`, for example, `~fmt::ArgVisitor::visit_int()`.
+ Pass the subclass as the *Impl* template parameter. When a formatting
+ function processes an argument, it will dispatch to a visit method
+ specific to the argument type. For example, if the argument type is
+ ``double`` then the `~fmt::ArgVisitor::visit_double()` method of a subclass
+ will be called. If the subclass doesn't contain a method with this signature,
+ then a corresponding method of `~fmt::BasicPrintfArgFormatter` or its
+ superclass will be called.
+ \endrst
+ */
+template<typename Impl, typename Char, typename Spec>
+class BasicPrintfArgFormatter : public internal::ArgFormatterBase<Impl, Char, Spec>
+{
+private:
+ void write_null_pointer()
+ {
+ this->spec().type_ = 0;
+ this->write("(nil)");
+ }
+
+ typedef internal::ArgFormatterBase<Impl, Char, Spec> Base;
+
+public:
+ /**
+ \rst
+ Constructs an argument formatter object.
+ *writer* is a reference to the output writer and *spec* contains format
+ specifier information for standard argument types.
+ \endrst
+ */
+ BasicPrintfArgFormatter(BasicWriter<Char> &w, Spec &s)
+ : internal::ArgFormatterBase<Impl, Char, Spec>(w, s)
+ {
+ }
+
+ /** Formats an argument of type ``bool``. */
+ void visit_bool(bool value)
+ {
+ Spec &fmt_spec = this->spec();
+ if (fmt_spec.type_ != 's')
+ return this->visit_any_int(value);
+ fmt_spec.type_ = 0;
+ this->write(value);
+ }
+
+ /** Formats a character. */
+ void visit_char(int value)
+ {
+ const Spec &fmt_spec = this->spec();
+ BasicWriter<Char> &w = this->writer();
+ if (fmt_spec.type_ && fmt_spec.type_ != 'c')
+ w.write_int(value, fmt_spec);
+ typedef typename BasicWriter<Char>::CharPtr CharPtr;
+ CharPtr out = CharPtr();
+ if (fmt_spec.width_ > 1)
+ {
+ Char fill = ' ';
+ out = w.grow_buffer(fmt_spec.width_);
+ if (fmt_spec.align_ != ALIGN_LEFT)
+ {
+ std::fill_n(out, fmt_spec.width_ - 1, fill);
+ out += fmt_spec.width_ - 1;
+ }
+ else
+ {
+ std::fill_n(out + 1, fmt_spec.width_ - 1, fill);
+ }
+ }
+ else
+ {
+ out = w.grow_buffer(1);
+ }
+ *out = static_cast<Char>(value);
+ }
+
+ /** Formats a null-terminated C string. */
+ void visit_cstring(const char *value)
+ {
+ if (value)
+ Base::visit_cstring(value);
+ else if (this->spec().type_ == 'p')
+ write_null_pointer();
+ else
+ this->write("(null)");
+ }
+
+ /** Formats a pointer. */
+ void visit_pointer(const void *value)
+ {
+ if (value)
+ return Base::visit_pointer(value);
+ this->spec().type_ = 0;
+ write_null_pointer();
+ }
+
+ /** Formats an argument of a custom (user-defined) type. */
+ void visit_custom(internal::Arg::CustomValue c)
+ {
+ BasicFormatter<Char> formatter(ArgList(), this->writer());
+ const Char format_str[] = {'}', 0};
+ const Char *format = format_str;
+ c.format(&formatter, c.value, &format);
+ }
+};
+
+/** The default printf argument formatter. */
+template<typename Char>
+class PrintfArgFormatter : public BasicPrintfArgFormatter<PrintfArgFormatter<Char>, Char, FormatSpec>
+{
+public:
+ /** Constructs an argument formatter object. */
+ PrintfArgFormatter(BasicWriter<Char> &w, FormatSpec &s)
+ : BasicPrintfArgFormatter<PrintfArgFormatter<Char>, Char, FormatSpec>(w, s)
+ {
+ }
+};
+
+/** This template formats data and writes the output to a writer. */
+template<typename Char, typename ArgFormatter = PrintfArgFormatter<Char>>
+class PrintfFormatter : private internal::FormatterBase
+{
+private:
+ BasicWriter<Char> &writer_;
+
+ void parse_flags(FormatSpec &spec, const Char *&s);
+
+ // Returns the argument with specified index or, if arg_index is equal
+ // to the maximum unsigned value, the next argument.
+ internal::Arg get_arg(const Char *s, unsigned arg_index = (std::numeric_limits<unsigned>::max)());
+
+ // Parses argument index, flags and width and returns the argument index.
+ unsigned parse_header(const Char *&s, FormatSpec &spec);
+
+public:
+ /**
+ \rst
+ Constructs a ``PrintfFormatter`` object. References to the arguments and
+ the writer are stored in the formatter object so make sure they have
+ appropriate lifetimes.
+ \endrst
+ */
+ explicit PrintfFormatter(const ArgList &al, BasicWriter<Char> &w)
+ : FormatterBase(al)
+ , writer_(w)
+ {
+ }
+
+ /** Formats stored arguments and writes the output to the writer. */
+ void format(BasicCStringRef<Char> format_str);
+};
+
+template<typename Char, typename AF>
+void PrintfFormatter<Char, AF>::parse_flags(FormatSpec &spec, const Char *&s)
+{
+ for (;;)
+ {
+ switch (*s++)
+ {
+ case '-':
+ spec.align_ = ALIGN_LEFT;
+ break;
+ case '+':
+ spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
+ break;
+ case '0':
+ spec.fill_ = '0';
+ break;
+ case ' ':
+ spec.flags_ |= SIGN_FLAG;
+ break;
+ case '#':
+ spec.flags_ |= HASH_FLAG;
+ break;
+ default:
+ --s;
+ return;
+ }
+ }
+}
+
+template<typename Char, typename AF>
+internal::Arg PrintfFormatter<Char, AF>::get_arg(const Char *s, unsigned arg_index)
+{
+ (void)s;
+ const char *error = FMT_NULL;
+ internal::Arg arg = arg_index == std::numeric_limits<unsigned>::max() ? next_arg(error) : FormatterBase::get_arg(arg_index - 1, error);
+ if (error)
+ FMT_THROW(FormatError(!*s ? "invalid format string" : error));
+ return arg;
+}
+
+template<typename Char, typename AF>
+unsigned PrintfFormatter<Char, AF>::parse_header(const Char *&s, FormatSpec &spec)
+{
+ unsigned arg_index = std::numeric_limits<unsigned>::max();
+ Char c = *s;
+ if (c >= '0' && c <= '9')
+ {
+ // Parse an argument index (if followed by '$') or a width possibly
+ // preceded with '0' flag(s).
+ unsigned value = internal::parse_nonnegative_int(s);
+ if (*s == '$') // value is an argument index
+ {
+ ++s;
+ arg_index = value;
+ }
+ else
+ {
+ if (c == '0')
+ spec.fill_ = '0';
+ if (value != 0)
+ {
+ // Nonzero value means that we parsed width and don't need to
+ // parse it or flags again, so return now.
+ spec.width_ = value;
+ return arg_index;
+ }
+ }
+ }
+ parse_flags(spec, s);
+ // Parse width.
+ if (*s >= '0' && *s <= '9')
+ {
+ spec.width_ = internal::parse_nonnegative_int(s);
+ }
+ else if (*s == '*')
+ {
+ ++s;
+ spec.width_ = internal::WidthHandler(spec).visit(get_arg(s));
+ }
+ return arg_index;
+}
+
+template<typename Char, typename AF>
+void PrintfFormatter<Char, AF>::format(BasicCStringRef<Char> format_str)
+{
+ const Char *start = format_str.c_str();
+ const Char *s = start;
+ while (*s)
+ {
+ Char c = *s++;
+ if (c != '%')
+ continue;
+ if (*s == c)
+ {
+ write(writer_, start, s);
+ start = ++s;
+ continue;
+ }
+ write(writer_, start, s - 1);
+
+ FormatSpec spec;
+ spec.align_ = ALIGN_RIGHT;
+
+ // Parse argument index, flags and width.
+ unsigned arg_index = parse_header(s, spec);
+
+ // Parse precision.
+ if (*s == '.')
+ {
+ ++s;
+ if ('0' <= *s && *s <= '9')
+ {
+ spec.precision_ = static_cast<int>(internal::parse_nonnegative_int(s));
+ }
+ else if (*s == '*')
+ {
+ ++s;
+ spec.precision_ = internal::PrecisionHandler().visit(get_arg(s));
+ }
+ else
+ {
+ spec.precision_ = 0;
+ }
+ }
+
+ using internal::Arg;
+ Arg arg = get_arg(s, arg_index);
+ if (spec.flag(HASH_FLAG) && internal::IsZeroInt().visit(arg))
+ spec.flags_ &= ~internal::to_unsigned<int>(HASH_FLAG);
+ if (spec.fill_ == '0')
+ {
+ if (arg.type <= Arg::LAST_NUMERIC_TYPE)
+ spec.align_ = ALIGN_NUMERIC;
+ else
+ spec.fill_ = ' '; // Ignore '0' flag for non-numeric types.
+ }
+
+ // Parse length and convert the argument to the required type.
+ using internal::ArgConverter;
+ switch (*s++)
+ {
+ case 'h':
+ if (*s == 'h')
+ ArgConverter<signed char>(arg, *++s).visit(arg);
+ else
+ ArgConverter<short>(arg, *s).visit(arg);
+ break;
+ case 'l':
+ if (*s == 'l')
+ ArgConverter<fmt::LongLong>(arg, *++s).visit(arg);
+ else
+ ArgConverter<long>(arg, *s).visit(arg);
+ break;
+ case 'j':
+ ArgConverter<intmax_t>(arg, *s).visit(arg);
+ break;
+ case 'z':
+ ArgConverter<std::size_t>(arg, *s).visit(arg);
+ break;
+ case 't':
+ ArgConverter<std::ptrdiff_t>(arg, *s).visit(arg);
+ break;
+ case 'L':
+ // printf produces garbage when 'L' is omitted for long double, no
+ // need to do the same.
+ break;
+ default:
+ --s;
+ ArgConverter<void>(arg, *s).visit(arg);
+ }
+
+ // Parse type.
+ if (!*s)
+ FMT_THROW(FormatError("invalid format string"));
+ spec.type_ = static_cast<char>(*s++);
+
+ if (spec.type_ == 's')
+ {
+ // set the format type to the default if 's' is specified
+ spec.type_ = internal::DefaultType().visit(arg);
+ }
+
+ if (arg.type <= Arg::LAST_INTEGER_TYPE)
+ {
+ // Normalize type.
+ switch (spec.type_)
+ {
+ case 'i':
+ case 'u':
+ spec.type_ = 'd';
+ break;
+ case 'c':
+ // TODO: handle wchar_t
+ internal::CharConverter(arg).visit(arg);
+ break;
+ }
+ }
+
+ start = s;
+
+ // Format argument.
+ AF(writer_, spec).visit(arg);
+ }
+ write(writer_, start, s);
+}
+
+inline void printf(Writer &w, CStringRef format, ArgList args)
+{
+ PrintfFormatter<char>(args, w).format(format);
+}
+FMT_VARIADIC(void, printf, Writer &, CStringRef)
+
+inline void printf(WWriter &w, WCStringRef format, ArgList args)
+{
+ PrintfFormatter<wchar_t>(args, w).format(format);
+}
+FMT_VARIADIC(void, printf, WWriter &, WCStringRef)
+
+/**
+ \rst
+ Formats arguments and returns the result as a string.
+
+ **Example**::
+
+ std::string message = fmt::sprintf("The answer is %d", 42);
+ \endrst
+*/
+inline std::string sprintf(CStringRef format, ArgList args)
+{
+ MemoryWriter w;
+ printf(w, format, args);
+ return w.str();
+}
+FMT_VARIADIC(std::string, sprintf, CStringRef)
+
+inline std::wstring sprintf(WCStringRef format, ArgList args)
+{
+ WMemoryWriter w;
+ printf(w, format, args);
+ return w.str();
+}
+FMT_VARIADIC_W(std::wstring, sprintf, WCStringRef)
+
+/**
+ \rst
+ Prints formatted data to the file *f*.
+
+ **Example**::
+
+ fmt::fprintf(stderr, "Don't %s!", "panic");
+ \endrst
+ */
+FMT_API int fprintf(std::FILE *f, CStringRef format, ArgList args);
+FMT_VARIADIC(int, fprintf, std::FILE *, CStringRef)
+
+/**
+ \rst
+ Prints formatted data to ``stdout``.
+
+ **Example**::
+
+ fmt::printf("Elapsed time: %.2f seconds", 1.23);
+ \endrst
+ */
+inline int printf(CStringRef format, ArgList args)
+{
+ return fprintf(stdout, format, args);
+}
+FMT_VARIADIC(int, printf, CStringRef)
+
+/**
+ \rst
+ Prints formatted data to the stream *os*.
+
+ **Example**::
+
+ fprintf(cerr, "Don't %s!", "panic");
+ \endrst
+ */
+inline int fprintf(std::ostream &os, CStringRef format_str, ArgList args)
+{
+ MemoryWriter w;
+ printf(w, format_str, args);
+ internal::write(os, w);
+ return static_cast<int>(w.size());
+}
+FMT_VARIADIC(int, fprintf, std::ostream &, CStringRef)
+} // namespace fmt
+
+#ifdef FMT_HEADER_ONLY
+#include "printf.cc"
+#endif
+
+#endif // FMT_PRINTF_H_