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| Current File : //usr/share/bison/location.cc |
# C++ skeleton for Bison
# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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/>.
# We do want M4 expansion after # for CPP macros.
m4_changecom()
m4_divert_push(0)dnl
@output(b4_dir_prefix[]position.hh@)
b4_copyright([Positions for Bison parsers in C++],
[2002, 2003, 2004, 2005, 2006])[
/**
** \file position.hh
** Define the ]b4_namespace_ref[::position class.
*/
#ifndef BISON_POSITION_HH
# define BISON_POSITION_HH
# include <iostream>
# include <string>
# include <algorithm>
]b4_namespace_open[
/// Abstract a position.
class position
{
public:
]m4_ifdef([b4_location_constructors], [
/// Construct a position.
position ()
: filename (0), line (]b4_location_initial_line[), column (]b4_location_initial_column[)
{
}
])[
/// Initialization.
inline void initialize (]b4_percent_define_get([[filename_type]])[* fn)
{
filename = fn;
line = ]b4_location_initial_line[;
column = ]b4_location_initial_column[;
}
/** \name Line and Column related manipulators
** \{ */
public:
/// (line related) Advance to the COUNT next lines.
inline void lines (int count = 1)
{
column = ]b4_location_initial_column[;
line += count;
}
/// (column related) Advance to the COUNT next columns.
inline void columns (int count = 1)
{
column = std::max (]b4_location_initial_column[u, column + count);
}
/** \} */
public:
/// File name to which this position refers.
]b4_percent_define_get([[filename_type]])[* 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;
}
]b4_percent_define_flag_if([[define_location_comparison]], [[
/// 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;
}
]b4_namespace_close[
#endif // not BISON_POSITION_HH]
@output(b4_dir_prefix[]location.hh@)
b4_copyright([Locations for Bison parsers in C++],
[2002, 2003, 2004, 2005, 2006])[
/**
** \file location.hh
** Define the ]b4_namespace_ref[::location class.
*/
#ifndef BISON_LOCATION_HH
# define BISON_LOCATION_HH
# include <iostream>
# include <string>
# include "position.hh"
]b4_namespace_open[
/// Abstract a location.
class location
{
public:
]m4_ifdef([b4_location_constructors], [
/// Construct a location.
location ()
: begin (), end ()
{
}
])[
/// Initialization.
inline void initialize (]b4_percent_define_get([[filename_type]])[* fn)
{
begin.initialize (fn);
end = begin;
}
/** \name Line and Column related manipulators
** \{ */
public:
/// Reset initial location to final location.
inline void step ()
{
begin = end;
}
/// Extend the current location to the COUNT next columns.
inline void columns (unsigned int count = 1)
{
end += count;
}
/// Extend the current location to the COUNT next lines.
inline void lines (unsigned int count = 1)
{
end.lines (count);
}
/** \} */
public:
/// Beginning of the located region.
position begin;
/// End of the located region.
position end;
};
/// Join two location objects to create a location.
inline const location operator+ (const location& begin, const location& end)
{
location res = begin;
res.end = end.end;
return res;
}
/// Add two location objects.
inline const location operator+ (const location& begin, unsigned int width)
{
location res = begin;
res.columns (width);
return res;
}
/// Add and assign a location.
inline location& operator+= (location& res, unsigned int width)
{
res.columns (width);
return res;
}
]b4_percent_define_flag_if([[define_location_comparison]], [[
/// Compare two location objects.
inline bool
operator== (const location& loc1, const location& loc2)
{
return loc1.begin == loc2.begin && loc1.end == loc2.end;
}
/// Compare two location objects.
inline bool
operator!= (const location& loc1, const location& loc2)
{
return !(loc1 == loc2);
}
]])[
/** \brief Intercept output stream redirection.
** \param ostr the destination output stream
** \param loc a reference to the location to redirect
**
** Avoid duplicate information.
*/
inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
{
position last = loc.end - 1;
ostr << loc.begin;
if (last.filename
&& (!loc.begin.filename
|| *loc.begin.filename != *last.filename))
ostr << '-' << last;
else if (loc.begin.line != last.line)
ostr << '-' << last.line << '.' << last.column;
else if (loc.begin.column != last.column)
ostr << '-' << last.column;
return ostr;
}
]b4_namespace_close[
#endif // not BISON_LOCATION_HH]
m4_divert_pop(0)
m4_changecom([#])