1 /* A Bison parser, made by GNU Bison 2.3.  */

     2 

     3 /* Positions for Bison parsers in C++

     4 

     5    Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.

     6 

     7    This program is free software; you can redistribute it and/or modify

     8    it under the terms of the GNU General Public License as published by

     9    the Free Software Foundation; either version 2, or (at your option)

    10    any later version.

    11 

    12    This program is distributed in the hope that it will be useful,

    13    but WITHOUT ANY WARRANTY; without even the implied warranty of

    14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    15    GNU General Public License for more details.

    16 

    17    You should have received a copy of the GNU General Public License

    18    along with this program; if not, write to the Free Software

    19    Foundation, Inc., 51 Franklin Street, Fifth Floor,

    20    Boston, MA 02110-1301, USA.  */

    21 

    22 /* As a special exception, you may create a larger work that contains

    23    part or all of the Bison parser skeleton and distribute that work

    24    under terms of your choice, so long as that work isn't itself a

    25    parser generator using the skeleton or a modified version thereof

    26    as a parser skeleton.  Alternatively, if you modify or redistribute

    27    the parser skeleton itself, you may (at your option) remove this

    28    special exception, which will cause the skeleton and the resulting

    29    Bison output files to be licensed under the GNU General Public

    30    License without this special exception.

    31 

    32    This special exception was added by the Free Software Foundation in

    33    version 2.2 of Bison.  */

    34 

    35 /**

    36  ** \file position.hh

    37  ** Define the yy::position class.

    38  */

    39 

    40 #ifndef BISON_POSITION_HH

    41 # define BISON_POSITION_HH

    42 

    43 # include <iostream>

    44 # include <string>

    45 

    46 namespace yy

    47 {

    48   /// Abstract a position.

    49   class position

    50   {

    51   public:

    52 

    53     /// Construct a position.

    54     position ()

    55       : filename (0), line (1), column (0)

    56     {

    57     }

    58 

    59 

    60     /// Initialization.

    61     inline void initialize (std::string* fn)

    62     {

    63       filename = fn;

    64       line = 1;

    65       column = 0;

    66     }

    67 

    68     /** \name Line and Column related manipulators

    69      ** \{ */

    70   public:

    71     /// (line related) Advance to the COUNT next lines.

    72     inline void lines (int count = 1)

    73     {

    74       column = 0;

    75       line += count;

    76     }

    77 

    78     /// (column related) Advance to the COUNT next columns.

    79     inline void columns (int count = 1)

    80     {

    81       int leftmost = 0;

    82       int current  = column;

    83       if (leftmost <= current + count)

    84 	column += count;

    85       else

    86 	column = 0;

    87     }

    88     /** \} */

    89 

    90   public:

    91     /// File name to which this position refers.

    92     std::string* filename;

    93     /// Current line number.

    94     unsigned int line;

    95     /// Current column number.

    96     unsigned int column;

    97   };

    98 

    99   /// Add and assign a position.

   100   inline const position&

   101   operator+= (position& res, const int width)

   102   {

   103     res.columns (width);

   104     return res;

   105   }

   106 

   107   /// Add two position objects.

   108   inline const position

   109   operator+ (const position& begin, const int width)

   110   {

   111     position res = begin;

   112     return res += width;

   113   }

   114 

   115   /// Add and assign a position.

   116   inline const position&

   117   operator-= (position& res, const int width)

   118   {

   119     return res += -width;

   120   }

   121 

   122   /// Add two position objects.

   123   inline const position

   124   operator- (const position& begin, const int width)

   125   {

   126     return begin + -width;

   127   }

   128 

   129   /** \brief Intercept output stream redirection.

   130    ** \param ostr the destination output stream

   131    ** \param pos a reference to the position to redirect

   132    */

   133   inline std::ostream&

   134   operator<< (std::ostream& ostr, const position& pos)

   135   {

   136     if (pos.filename)

   137       ostr << *pos.filename << ':';

   138     return ostr << pos.line << '.' << pos.column;

   139   }

   140 

   141 }

   142 #endif // not BISON_POSITION_HH