indent.hxx

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/*
 *   xyzzy
 *   Copyright (C) 2007    Karl W. Pfalzer
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version 2
 *   of the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the
 *   Free Software Foundation, Inc.
 *   51 Franklin Street, Fifth Floor
 *   Boston, MA  02110-1301, USA.
 */

#if !defined(_xyzzy_indent_hxx_)
#    define  _xyzzy_indent_hxx_

#include <string>

namespace xyzzy
{
    class TIndent
    {
    public:
        TIndent(int indentAmt = 4);
        
        TIndent(const TIndent &s, bool indent = true);

        operator const char*() const
        {
            return m_indent.c_str();
        }

    private:
        static int  st_indentAmt;
        static bool st_notUsedYet;

        std::string m_indent;
    };
};

/*
  Following macros used as:
 
    TIndent start;
    ...
    // "indent" will be declared as "const char*" by BEGIN_INDENT() macro
    // for subsequent used.
    //
    BEGIN_INDENT(indent, start);
    ...
    cerr << indent << ...;
    ...
    END_INDENT(start);
 */

#define BEGIN_INDENT(_indent,_indentRef)                    \
    xyzzy::TIndent __indentSaved(_indentRef, false);\
    _indentRef = xyzzy::TIndent(__indentSaved);     \
    const char *_indent = _indentRef

#define END_INDENT(_indentRef) _indentRef = xyzzy::TIndent(__indentSaved,false)

#endif  //#    define  _xyzzy_indent_hxx_

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