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Format.h

//
// Format.h
//
// $Id: //poco/1.3/Foundation/include/Poco/Format.h#5 $
//
// Library: Foundation
// Package: Core
// Module:  Format
//
// Definition of the format freestanding function.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Foundation_Format_INCLUDED
#define Foundation_Format_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Any.h"
#include <vector>


namespace Poco {


std::string Foundation_API format(const std::string& fmt, const Any& value);
      /// This function implements sprintf-style formatting in a typesafe way.
      /// Various variants of the function are available, supporting a
      /// different number of arguments (up to six).
      ///
      /// The formatting is controlled by the format string in fmt.
      /// Format strings are quite similar to those of the std::printf() function, but
      /// there are some minor differences.
      ///
      /// The format string can consist of any sequence of characters; certain
      /// characters have a special meaning. Characters without a special meaning
      /// are copied verbatim to the result. A percent sign (%) marks the beginning
      /// of a format specification. Format specifications have the following syntax:
      ///
      ///   %[<flags>][<width>][.<precision>][<modifier>]<type>
      ///
      /// Flags, width, precision and prefix are optional. The only required part of
      /// the format specification, apart from the percent sign, is the type.
      ///
      /// Following are valid type specifications and their meaning:
      ///
      ///   * b boolean (true = 1, false = 0)
      ///   * c character
      ///   * d signed decimal integer
      ///   * i signed decimal integer
      ///   * o unsigned octal integer
      ///   * u unsigned decimal integer
      ///   * x unsigned hexadecimal integer (lower case)
      ///   * X unsigned hexadecimal integer (upper case)
      ///   * e signed floating-point value in the form [-]d.dddde[<sign>]dd[d]
      ///   * E signed floating-point value in the form [-]d.ddddE[<sign>]dd[d]
      ///   * f signed floating-point value in the form [-]dddd.dddd
      ///   * s std::string
      ///   * z std::size_t
      ///
      /// The following flags are supported:
      ///
      ///   * - left align the result within the given field width
      ///   * + prefix the output value with a sign (+ or ) if the output value is of a signed type
      ///   * 0 if width is prefixed with 0, zeros are added until the minimum width is reached
      ///   * # For o, x, X, the # flag prefixes any nonzero output value with 0, 0x, or 0X, respectively; 
      ///     for e, E, f, the # flag forces the output value to contain a decimal point in all cases.
      ///
      /// The following modifiers are supported:
      ///
      ///   * (none) argument is char (c), int (d, i), unsigned (o, u, x, X) double (e, E, f, g, G) or string (s)
      ///   * l      argument is long (d, i), unsigned long (o, u, x, X) or long double (e, E, f, g, G)
      ///   * L      argument is long long (d, i), unsigned long long (o, u, x, X)
      ///   * h      argument is short (d, i), unsigned short (o, u, x, X) or float (e, E, f, g, G)
      ///   * ?      argument is any signed or unsigned int, short, long, or 64-bit integer (d, i, o, x, X)
      ///
      /// The width argument is a nonnegative decimal integer controlling the minimum number of characters printed.
      /// If the number of characters in the output value is less than the specified width, blanks or
      /// leading zeros are added, according to the specified flags (-, +, 0).
      ///
      /// Precision is a nonnegative decimal integer, preceded by a period (.), which specifies the number of characters 
      /// to be printed, the number of decimal places, or the number of significant digits.
      ///
      /// Throws a BadCastException if an argument does not correspond to the type of its format specification.
      /// 
      /// If there are more format specifiers than values, the format specifiers without a corresponding value
      /// are copied verbatim to output.
      ///
      /// If there are more values than format specifiers, the superfluous values are ignored.
      ///
      /// Usage Example:
      ///     std::string s = format("The answer to life, the universe, and everything is %d", 42);

std::string Foundation_API format(const std::string& fmt, const Any& value1, const Any& value2);
std::string Foundation_API format(const std::string& fmt, const Any& value1, const Any& value2, const Any& value3);
std::string Foundation_API format(const std::string& fmt, const Any& value1, const Any& value2, const Any& value3, const Any& value4);
std::string Foundation_API format(const std::string& fmt, const Any& value1, const Any& value2, const Any& value3, const Any& value4, const Any& value5);
std::string Foundation_API format(const std::string& fmt, const Any& value1, const Any& value2, const Any& value3, const Any& value4, const Any& value5, const Any& value6);


void Foundation_API format(std::string& result, const std::string& fmt, const Any& value);
      /// Appends the formatted string to result.
      
void Foundation_API format(std::string& result, const std::string& fmt, const Any& value1, const Any& value2);
void Foundation_API format(std::string& result, const std::string& fmt, const Any& value1, const Any& value2, const Any& value3);
void Foundation_API format(std::string& result, const std::string& fmt, const Any& value1, const Any& value2, const Any& value3, const Any& value4);
void Foundation_API format(std::string& result, const std::string& fmt, const Any& value1, const Any& value2, const Any& value3, const Any& value4, const Any& value5);
void Foundation_API format(std::string& result, const std::string& fmt, const Any& value1, const Any& value2, const Any& value3, const Any& value4, const Any& value5, const Any& value6);


void Foundation_API format(std::string& result, const std::string& fmt, const std::vector<Any>& values);
      /// Supports a variable number of arguments and is used by
      /// all other variants of format().


} // namespace Poco


#endif // Foundation_Format_INCLUDED

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