string_format.cpp

Go to the documentation of this file.

/*
**  ClanLib SDK
**  Copyright (c) 1997-2005 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#include "precomp.h"
#include "string_format.h"
#include "string_help.h"
#include "exception.h"

// CL_StringFormat Construction:

CL_StringFormat::CL_StringFormat(const CL_String &format_string)
: string(format_string)
{
        bool arg_mode = false;
        int arg_start = 0;
        int arg_value = 0;
        int index, size;
        size = (int) string.size();
        for (index = 0; index < size; index++)
        {
                if (!arg_mode)
                {
                        if (string[index] == TEXT('%'))
                        {
                                arg_mode = true;
                                arg_value = 0;
                                arg_start = index;
                        }
                }
                else
                {
                        switch (string[index])
                        {
                        case TEXT('%'):
                                if (arg_start == index-1)
                                {
                                        arg_mode = false;
                                        string = string.substr(0, index) + string.substr(index + 1);
                                        index--;
                                        size--;
                                }
                                else
                                {
                                        create_arg(arg_value, arg_start, index-arg_start);
                                        arg_start = index;
                                        arg_value = 0;
                                }
                                break;
                        case TEXT('0'):
                        case TEXT('1'):
                        case TEXT('2'):
                        case TEXT('3'):
                        case TEXT('4'):
                        case TEXT('5'):
                        case TEXT('6'):
                        case TEXT('7'):
                        case TEXT('8'):
                        case TEXT('9'):
                                arg_value *= 10;
                                arg_value += string[index]-TEXT('0');
                                break;
                        default:
                                if (arg_start != index-1)
                                        create_arg(arg_value, arg_start, index-arg_start);
                                arg_mode = false;
                                break;
                        }
                }
        }
        
        if (arg_mode && arg_start != size-1)
                create_arg(arg_value, arg_start, size-arg_start);
}

CL_StringFormat::~CL_StringFormat()
{
}

// CL_StringFormat Attributes:

const CL_String &CL_StringFormat::get_result() const
{
        return string;
}

// CL_StringFormat Operations:

void CL_StringFormat::set_arg(int index, const CL_StringA &text)
{
#ifdef UNICODE
        set_arg(index, CL_StringHelp::local8_to_ucs2(text));
#else
        if (index >= (int) args.size())
                return;
                
        ArgPosition pos = args[index];
        if (pos.length == 0)
                return;
                
        int delta_size = ((int) text.length()) - pos.length;
        string = string.substr(0, pos.start) + text + string.substr(pos.start + pos.length);
        args[index].length = (int) text.length();
        
        std::vector<ArgPosition>::size_type i, size;
        size = args.size();
        for (i = 0; i < size; i++)
        {
                if (args[i].start > pos.start)
                        args[i].start += delta_size;
        }
#endif
}

void CL_StringFormat::set_arg(int index, const CL_StringW &text)
{
#ifdef UNICODE
        if (index >= args.size())
                return;
                
        ArgPosition pos = args[index];
        if (pos.length == 0)
                return;
                
        int delta_size = ((int) text.length()) - pos.length;
        string = string.substr(0, pos.start) + text + string.substr(pos.start + pos.length);
        args[index].length = text.length();
        
        std::vector<ArgPosition>::size_type i, size;
        size = args.size();
        for (i = 0; i < size; i++)
        {
                if (args[i].start > pos.start)
                        args[i].start += delta_size;
        }
#else
        set_arg(index, CL_StringHelp::ucs2_to_local8(text));
#endif
}
        
void CL_StringFormat::set_arg(int index, int value, int min_length)
{
        CL_String t = CL_StringHelp::int_to_text(value);
        if ((int) t.length() < min_length) t = CL_String(min_length-t.length(), TEXT('0')) + t;
        set_arg(index, t);
}
        
void CL_StringFormat::set_arg(int index, double value)
{
        set_arg(index, CL_StringHelp::double_to_text(value));
}

// CL_StringFormat Implementation:

void CL_StringFormat::create_arg(int index, int start, int length)
{
        if (index > 256)
                throw CL_Exception(TEXT("Encountered more than 256 indexes in a formatted string!"));

        ArgPosition pos(start, length);
        while (index >= (int) args.size())
                args.push_back(ArgPosition());
        
        args[index].start = start;
        args[index].length = length;
}

---