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bison/src/bison/2.4.1/bison-2.4.1-src/examples/calc++/position.hh

+
+/* A Bison parser, made by GNU Bison 2.4.1.  */
+
+/* Positions for Bison parsers in C++
+   
+      Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   
+   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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+/* As a special exception, you may create a larger work that contains
+   part or all of the Bison parser skeleton and distribute that work
+   under terms of your choice, so long as that work isn't itself a
+   parser generator using the skeleton or a modified version thereof
+   as a parser skeleton.  Alternatively, if you modify or redistribute
+   the parser skeleton itself, you may (at your option) remove this
+   special exception, which will cause the skeleton and the resulting
+   Bison output files to be licensed under the GNU General Public
+   License without this special exception.
+   
+   This special exception was added by the Free Software Foundation in
+   version 2.2 of Bison.  */
+
+/**
+ ** \file position.hh
+ ** Define the yy::position class.
+ */
+
+#ifndef BISON_POSITION_HH
+# define BISON_POSITION_HH
+
+# include <iostream>
+# include <string>
+# include <algorithm>
+
+
+/* Line 38 of location.cc  */
+#line 1 "[Bison:b4_percent_define_default]"
+
+namespace yy {
+
+/* Line 38 of location.cc  */
+#line 54 "./position.hh"
+  /// Abstract a position.
+  class position
+  {
+  public:
+
+    /// Construct a position.
+    position ()
+      : filename (0), line (1), column (1)
+    {
+    }
+
+
+    /// Initialization.
+    inline void initialize (std::string* fn)
+    {
+      filename = fn;
+      line = 1;
+      column = 1;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+  public:
+    /// (line related) Advance to the COUNT next lines.
+    inline void lines (int count = 1)
+    {
+      column = 1;
+      line += count;
+    }
+
+    /// (column related) Advance to the COUNT next columns.
+    inline void columns (int count = 1)
+    {
+      column = std::max (1u, column + count);
+    }
+    /** \} */
+
+  public:
+    /// File name to which this position refers.
+    std::string* filename;
+    /// Current line number.
+    unsigned int line;
+    /// Current column number.
+    unsigned int column;
+  };
+
+  /// Add and assign a position.
+  inline const position&
+  operator+= (position& res, const int width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add two position objects.
+  inline const position
+  operator+ (const position& begin, const int width)
+  {
+    position res = begin;
+    return res += width;
+  }
+
+  /// Add and assign a position.
+  inline const position&
+  operator-= (position& res, const int width)
+  {
+    return res += -width;
+  }
+
+  /// Add two position objects.
+  inline const position
+  operator- (const position& begin, const int width)
+  {
+    return begin + -width;
+  }
+
+  /// Compare two position objects.
+  inline bool
+  operator== (const position& pos1, const position& pos2)
+  {
+    return
+      (pos1.filename == pos2.filename
+       || pos1.filename && pos2.filename && *pos1.filename == *pos2.filename)
+      && pos1.line == pos2.line && pos1.column == pos2.column;
+  }
+
+  /// Compare two position objects.
+  inline bool
+  operator!= (const position& pos1, const position& pos2)
+  {
+    return !(pos1 == pos2);
+  }
+
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param pos a reference to the position to redirect
+   */
+  inline std::ostream&
+  operator<< (std::ostream& ostr, const position& pos)
+  {
+    if (pos.filename)
+      ostr << *pos.filename << ':';
+    return ostr << pos.line << '.' << pos.column;
+  }
+
+
+/* Line 144 of location.cc  */
+#line 1 "[Bison:b4_percent_define_default]"
+
+} // yy
+
+/* Line 144 of location.cc  */
+#line 167 "./position.hh"
+#endif // not BISON_POSITION_HH