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# C++ skeleton for Bison
# Copyright (C) 2002-2015 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/>.
m4_pushdef([b4_copyright_years],
[2002-2015])
# b4_position_define
# ------------------
# Define class position.
m4_define([b4_position_define],
[[ /// Abstract a position.
class position
{
public:]m4_ifdef([b4_location_constructors], [[
/// Construct a position.
explicit position (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
unsigned int l = ]b4_location_initial_line[u,
unsigned int c = ]b4_location_initial_column[u)
: filename (f)
, line (l)
, column (c)
{
}
]])[
/// Initialization.
void initialize (]b4_percent_define_get([[filename_type]])[* fn = YY_NULLPTR,
unsigned int l = ]b4_location_initial_line[u,
unsigned int c = ]b4_location_initial_column[u)
{
filename = fn;
line = l;
column = c;
}
/** \name Line and Column related manipulators
** \{ */
/// (line related) Advance to the COUNT next lines.
void lines (int count = 1)
{
if (count)
{
column = ]b4_location_initial_column[u;
line = add_ (line, count, ]b4_location_initial_line[);
}
}
/// (column related) Advance to the COUNT next columns.
void columns (int count = 1)
{
column = add_ (column, count, ]b4_location_initial_column[);
}
/** \} */
/// 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;
private:
/// Compute max(min, lhs+rhs) (provided min <= lhs).
static unsigned int add_ (unsigned int lhs, int rhs, unsigned int min)
{
return (0 < rhs || -static_cast<unsigned int>(rhs) < lhs
? rhs + lhs
: min);
}
};
/// Add \a width columns, in place.
inline position&
operator+= (position& res, int width)
{
res.columns (width);
return res;
}
/// Add \a width columns.
inline position
operator+ (position res, int width)
{
return res += width;
}
/// Subtract \a width columns, in place.
inline position&
operator-= (position& res, int width)
{
return res += -width;
}
/// Subtract \a width columns.
inline position
operator- (position res, int width)
{
return res -= width;
}
]b4_percent_define_flag_if([[define_location_comparison]], [[
/// Compare two position objects.
inline bool
operator== (const position& pos1, const position& pos2)
{
return (pos1.line == pos2.line
&& pos1.column == pos2.column
&& (pos1.filename == pos2.filename
|| (pos1.filename && pos2.filename
&& *pos1.filename == *pos2.filename)));
}
/// 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
*/
template <typename YYChar>
inline std::basic_ostream<YYChar>&
operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
{
if (pos.filename)
ostr << *pos.filename << ':';
return ostr << pos.line << '.' << pos.column;
}
]])
# b4_location_define
# ------------------
m4_define([b4_location_define],
[[ /// Abstract a location.
class location
{
public:
]m4_ifdef([b4_location_constructors], [
/// Construct a location from \a b to \a e.
location (const position& b, const position& e)
: begin (b)
, end (e)
{
}
/// Construct a 0-width location in \a p.
explicit location (const position& p = position ())
: begin (p)
, end (p)
{
}
/// Construct a 0-width location in \a f, \a l, \a c.
explicit location (]b4_percent_define_get([[filename_type]])[* f,
unsigned int l = ]b4_location_initial_line[u,
unsigned int c = ]b4_location_initial_column[u)
: begin (f, l, c)
, end (f, l, c)
{
}
])[
/// Initialization.
void initialize (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
unsigned int l = ]b4_location_initial_line[u,
unsigned int c = ]b4_location_initial_column[u)
{
begin.initialize (f, l, c);
end = begin;
}
/** \name Line and Column related manipulators
** \{ */
public:
/// Reset initial location to final location.
void step ()
{
begin = end;
}
/// Extend the current location to the COUNT next columns.
void columns (int count = 1)
{
end += count;
}
/// Extend the current location to the COUNT next lines.
void lines (int count = 1)
{
end.lines (count);
}
/** \} */
public:
/// Beginning of the located region.
position begin;
/// End of the located region.
position end;
};
/// Join two locations, in place.
inline location& operator+= (location& res, const location& end)
{
res.end = end.end;
return res;
}
/// Join two locations.
inline location operator+ (location res, const location& end)
{
return res += end;
}
/// Add \a width columns to the end position, in place.
inline location& operator+= (location& res, int width)
{
res.columns (width);
return res;
}
/// Add \a width columns to the end position.
inline location operator+ (location res, int width)
{
return res += width;
}
/// Subtract \a width columns to the end position, in place.
inline location& operator-= (location& res, int width)
{
return res += -width;
}
/// Subtract \a width columns to the end position.
inline location operator- (location res, int width)
{
return res -= width;
}
]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.
*/
template <typename YYChar>
inline std::basic_ostream<YYChar>&
operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
{
unsigned int end_col = 0 < loc.end.column ? loc.end.column - 1 : 0;
ostr << loc.begin;
if (loc.end.filename
&& (!loc.begin.filename
|| *loc.begin.filename != *loc.end.filename))
ostr << '-' << loc.end.filename << ':' << loc.end.line << '.' << end_col;
else if (loc.begin.line < loc.end.line)
ostr << '-' << loc.end.line << '.' << end_col;
else if (loc.begin.column < end_col)
ostr << '-' << end_col;
return ostr;
}
]])
b4_defines_if([
b4_output_begin([b4_dir_prefix[]position.hh])
b4_copyright([Positions for Bison parsers in C++])[
/**
** \file ]b4_dir_prefix[position.hh
** Define the ]b4_namespace_ref[::position class.
*/
]b4_cpp_guard_open([b4_dir_prefix[]position.hh])[
# include <algorithm> // std::max
# include <iostream>
# include <string>
]b4_null_define[
]b4_namespace_open[
]b4_position_define[
]b4_namespace_close[
]b4_cpp_guard_close([b4_dir_prefix[]position.hh])
b4_output_end()
b4_output_begin([b4_dir_prefix[]location.hh])
b4_copyright([Locations for Bison parsers in C++])[
/**
** \file ]b4_dir_prefix[location.hh
** Define the ]b4_namespace_ref[::location class.
*/
]b4_cpp_guard_open([b4_dir_prefix[]location.hh])[
# include "position.hh"
]b4_namespace_open[
]b4_location_define[
]b4_namespace_close[
]b4_cpp_guard_close([b4_dir_prefix[]location.hh])
b4_output_end()
])
m4_popdef([b4_copyright_years])