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pt-fvc.h
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1996-10-30
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/*
Copyright (C) 1996 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_fvc2_h)
#define octave_tree_fvc2_h 1
#if defined (__GNUG__)
#pragma interface
#endif
class ostream;
#include <SLList.h>
class symbol_record;
class tree_constant;
class tree_function;
class tree_walker;
#include "mappers.h"
#include "pt-fvc-base.h"
#include "variables.h"
// Symbols from the symbol table.
class
tree_identifier : public tree_fvc
{
friend class tree_index_expression;
public:
tree_identifier (int l = -1, int c = -1)
: tree_fvc (l, c), sym (0), maybe_do_ans_assign (false) { }
tree_identifier (symbol_record *s, int l = -1, int c = -1)
: tree_fvc (l, c), sym (s), maybe_do_ans_assign (false) { }
~tree_identifier (void) { }
bool is_identifier (void) const
{ return true; }
string name (void) const;
tree_identifier *define (tree_constant *t);
tree_identifier *define (tree_function *t);
void document (const string& s);
octave_value assign (const octave_value& t);
octave_value assign (const octave_value_list& args, const octave_value& t);
bool is_defined (void);
void increment (void);
void decrement (void);
tree_fvc *do_lookup (bool& script_file_executed, bool exec_script = true);
void link_to_global (void);
void mark_as_formal_parameter (void);
void mark_for_possible_ans_assign (void)
{ maybe_do_ans_assign = true; }
octave_value eval (bool print);
octave_value_list eval (bool print, int nargout,
const octave_value_list& args);
void eval_undefined_error (void);
void accept (tree_walker& tw);
octave_value value (void) const;
octave_value& reference (void);
private:
// The symbol record that this identifier references.
symbol_record *sym;
// True if we should consider assigning the result of evaluating
// this identifier to the built-in variable ans.
bool maybe_do_ans_assign;
};
// Indirect references to values (structure references).
class
tree_indirect_ref : public tree_fvc
{
public:
tree_indirect_ref (int l = -1, int c = -1)
: tree_fvc (l, c), id (0), indir (0), nm (),
preserve_ident (false), preserve_indir (false),
maybe_do_ans_assign (false) { }
tree_indirect_ref (tree_identifier *i, int l = -1, int c = -1)
: tree_fvc (l, c), id (i), indir (0), nm (),
preserve_ident (false), preserve_indir (false),
maybe_do_ans_assign (false) { }
tree_indirect_ref (tree_indirect_ref *i, const string& n,
int l = -1, int c = -1)
: tree_fvc (l, c), id (0), indir (i), nm (n),
preserve_ident (false), preserve_indir (false),
maybe_do_ans_assign (false) { }
~tree_indirect_ref (void);
bool is_indirect_ref (void) const
{ return true; }
bool is_identifier_only (void) const
{ return (id && nm.empty ()); }
tree_identifier *ident (void)
{ return id; }
tree_indirect_ref *indirect (void)
{ return indir; }
void preserve_identifier (void)
{ preserve_ident = true; }
void preserve_indirect (void)
{ preserve_indir = true; }
void mark_for_possible_ans_assign (void)
{
maybe_do_ans_assign = true;
if (is_identifier_only ())
id->mark_for_possible_ans_assign ();
}
string name (void) const;
octave_value eval (bool print);
octave_value_list eval (bool print, int nargout,
const octave_value_list& args);
octave_value value (void) const;
octave_value& reference (void);
string elt_name (void)
{ return nm; }
void accept (tree_walker& tw);
private:
// The identifier for this structure reference. For example, in
// a.b.c, a is the id.
tree_identifier *id;
// This element just points to another indirect reference.
tree_indirect_ref *indir;
// The sub-element name.
string nm;
// True if we should not delete the identifier.
bool preserve_ident;
// True if we should not delete the indirect reference.
bool preserve_indir;
// True if we should consider assigning the result of evaluating
// this identifier to the built-in variable ans.
bool maybe_do_ans_assign;
};
// Builtin functions.
class
tree_builtin : public tree_fvc
{
public:
tree_builtin (const string& nm = string ());
tree_builtin (const builtin_mapper_function& m_fcn,
const string& nm = string ());
tree_builtin (Octave_builtin_fcn f, const string& nm = string ());
~tree_builtin (void) { } // XXX ?? XXX
// int is_builtin (void) const;
bool is_mapper_function (void) const
{ return is_mapper; }
octave_value eval (bool print);
octave_value_list eval (bool print, int nargout, const octave_value_list& args);
string name (void) const
{ return my_name; }
void accept (tree_walker& tw);
private:
// True if this is a mapper function.
bool is_mapper;
// A structure describing the mapper function.
builtin_mapper_function mapper_fcn;
// The actual function, if it is not a mapper.
Octave_builtin_fcn fcn;
// The name of this function.
string my_name;
};
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/