Mercurial > octave
view src/pt-exp-base.h @ 2961:8a77d52c9d02
[project @ 1997-05-12 01:36:04 by jwe]
author | jwe |
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date | Mon, 12 May 1997 01:36:24 +0000 |
parents | 194b50e4725b |
children | f2be17e6f1ea |
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/* Copyright (C) 1996, 1997 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #if !defined (octave_tree_expr_h) #define octave_tree_expr_h 1 #if defined (__GNUG__) #pragma interface #endif #include <string> class octave_value; class octave_variable_reference; #include "pt-base.h" // A base class for expressions. class tree_expression : public tree { public: tree_expression (int l = -1, int c = -1) : tree (l, c), num_parens (0) { } virtual ~tree_expression (void) { } virtual bool is_constant (void) const { return false; } virtual bool is_matrix_constant (void) const { return false; } virtual bool is_multi_val_ret_expression (void) const { return false; } virtual bool is_identifier (void) const { return false; } virtual bool is_indirect_ref (void) const { return false; } virtual bool is_index_expression (void) const { return false; } virtual bool is_assignment_expression (void) const { return false; } virtual bool is_prefix_expression (void) const { return false; } virtual bool is_logically_true (const char *); virtual int paren_count (void) const { return num_parens; } virtual void mark_for_possible_ans_assign (void); virtual octave_value eval (bool print = false) = 0; virtual octave_variable_reference reference (void); virtual string oper (void) const { return "<unknown>"; } virtual string original_text (void) const; tree_expression *mark_in_parens (void) { num_parens++; return this; } protected: // A count of the number of times this expression appears directly // inside a set of parentheses. // // (((e1)) + e2) ==> 2 for expression e1 // ==> 1 for expression ((e1)) + e2 // ==> 0 for expression e2 int num_parens; }; #endif /* ;;; Local Variables: *** ;;; mode: C++ *** ;;; End: *** */