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physical/xdl/position.hh
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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
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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 nmt::position class.
38  */
39 
40 #ifndef BISON_POSITION_HH
41 # define BISON_POSITION_HH
42 
43 # include <iostream>
44 # include <string>
45 
46 namespace torc
47 {
48  /// Abstract a position.
49  class position
50  {
51  public:
52 
53  /// Construct a 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.
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
const position operator-(const position &begin, const int width)
Add two position objects.
position()
Construct a position.
std::ostream & operator<<(std::ostream &ostr, const location &loc)
Intercept output stream redirection.
unsigned int line
Current line number.
std::string string
location & operator+=(location &res, unsigned int width)
Add and assign a location.
std::string * filename
File name to which this position refers.
unsigned int column
Current column number.
const location operator+(const location &begin, const location &end)
Join two location objects to create a location.
const position & operator-=(position &res, const int width)
Add and assign a position.
void lines(int count=1)
(line related) Advance to the COUNT next lines.
void columns(int count=1)
(column related) Advance to the COUNT next columns.
void initialize(std::string *fn)
Initialization.