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1 /* A Bison parser, made by GNU Bison 2.3. */
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2
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3 /* Positions for Bison parsers in C++
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4
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5 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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6
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7 This program is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2, or (at your option)
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10 any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program; if not, write to the Free Software
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19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
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20 Boston, MA 02110-1301, USA. */
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21
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22 /* As a special exception, you may create a larger work that contains
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23 part or all of the Bison parser skeleton and distribute that work
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24 under terms of your choice, so long as that work isn't itself a
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25 parser generator using the skeleton or a modified version thereof
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26 as a parser skeleton. Alternatively, if you modify or redistribute
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27 the parser skeleton itself, you may (at your option) remove this
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28 special exception, which will cause the skeleton and the resulting
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29 Bison output files to be licensed under the GNU General Public
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30 License without this special exception.
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31
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32 This special exception was added by the Free Software Foundation in
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33 version 2.2 of Bison. */
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34
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35 /**
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36 ** \file position.hh
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37 ** Define the yy::position class.
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38 */
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39
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40 #ifndef BISON_POSITION_HH
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41 # define BISON_POSITION_HH
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42
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43 # include <iostream>
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44 # include <string>
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45
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46 namespace yy
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47 {
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48 /// Abstract a position.
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49 class position
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50 {
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51 public:
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52
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53 /// Construct a position.
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54 position ()
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55 : filename (0), line (1), column (0)
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56 {
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57 }
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58
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59
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60 /// Initialization.
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61 inline void initialize (std::string* fn)
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62 {
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63 filename = fn;
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64 line = 1;
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65 column = 0;
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66 }
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67
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68 /** \name Line and Column related manipulators
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69 ** \{ */
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70 public:
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71 /// (line related) Advance to the COUNT next lines.
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72 inline void lines (int count = 1)
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73 {
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74 column = 0;
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75 line += count;
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76 }
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77
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78 /// (column related) Advance to the COUNT next columns.
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79 inline void columns (int count = 1)
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80 {
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81 int leftmost = 0;
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82 int current = column;
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83 if (leftmost <= current + count)
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84 column += count;
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85 else
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86 column = 0;
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87 }
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88 /** \} */
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89
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90 public:
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91 /// File name to which this position refers.
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92 std::string* filename;
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93 /// Current line number.
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94 unsigned int line;
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95 /// Current column number.
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96 unsigned int column;
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97 };
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98
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99 /// Add and assign a position.
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100 inline const position&
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101 operator+= (position& res, const int width)
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102 {
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103 res.columns (width);
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104 return res;
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105 }
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106
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107 /// Add two position objects.
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108 inline const position
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109 operator+ (const position& begin, const int width)
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110 {
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111 position res = begin;
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112 return res += width;
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113 }
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114
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115 /// Add and assign a position.
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116 inline const position&
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117 operator-= (position& res, const int width)
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118 {
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119 return res += -width;
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120 }
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121
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122 /// Add two position objects.
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123 inline const position
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124 operator- (const position& begin, const int width)
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125 {
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126 return begin + -width;
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127 }
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128
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129 /** \brief Intercept output stream redirection.
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130 ** \param ostr the destination output stream
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131 ** \param pos a reference to the position to redirect
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132 */
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133 inline std::ostream&
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134 operator<< (std::ostream& ostr, const position& pos)
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135 {
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136 if (pos.filename)
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137 ostr << *pos.filename << ':';
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138 return ostr << pos.line << '.' << pos.column;
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139 }
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140
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141 }
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142 #endif // not BISON_POSITION_HH
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