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tree-base.h
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C/C++ Source or Header
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1996-09-28
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2KB
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90 lines
// tree-base.h -*- C++ -*-
/*
Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton
This file is part of Octave.
Octave 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 2, or (at your option) any
later version.
Octave 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 Octave; see the file COPYING. If not, write to the Free
Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#if !defined (octave_tree_base_h)
#define octave_tree_base_h 1
class ostream;
// How to print the code that the trees represent.
class
tree_print_code
{
public:
virtual ~tree_print_code (void) { }
virtual void print_code (ostream& os) = 0;
void reset_indent_level (void)
{ curr_print_indent_level = 0; }
void increment_indent_level (void)
{ curr_print_indent_level += 2; }
void decrement_indent_level (void)
{ curr_print_indent_level -= 2; }
void print_code_new_line (ostream& os);
void print_code_indent (ostream& os);
void print_code_reset (void);
private:
static int curr_print_indent_level;
static int beginning_of_line;
};
// Base class for the parse tree.
class
tree : public tree_print_code
{
public:
tree (int l = -1, int c = -1)
{
line_num = l;
column_num = c;
}
virtual int line (void) const
{ return line_num; }
virtual int column (void) const
{ return column_num; }
private:
int line_num;
int column_num;
};
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/