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tree-misc.cc
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1996-09-28
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// tree-misc.cc -*- 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <iostream.h>
#include "error.h"
#include "tree-base.h"
#include "tree-expr.h"
#include "tree-cmd.h"
#include "octave.h"
#include "tree-misc.h"
#include "tree-const.h"
#include "user-prefs.h"
#include "oct-obj.h"
// Nonzero means we're breaking out of a loop or function body.
extern int breaking;
// Nonzero means we're jumping to the end of a loop.
extern int continuing;
// Nonzero means we're returning from a function.
extern int returning;
// A list of commands to be executed.
tree_statement::~tree_statement (void)
{
delete command;
delete expression;
}
void
tree_statement::print_code (ostream& os)
{
if (command)
{
command->print_code (os);
if (! print_flag)
os << ";";
command->print_code_new_line (os);
}
else if (expression)
{
expression->print_code (os);
if (! print_flag)
os << ";";
expression->print_code_new_line (os);
}
}
tree_constant
tree_statement_list::eval (int print)
{
int pf;
tree_constant retval;
if (error_state)
return retval;
for (Pix p = first (); p != 0; next (p))
{
tree_statement *elt = this->operator () (p);
if (print == 0)
pf = 0;
else
pf = elt->print_flag;
tree_command *cmd = elt->command;
tree_expression *expr = elt->expression;
if (cmd || expr)
{
if (cmd)
cmd->eval ();
else
retval = expr->eval (pf);
if (error_state)
return tree_constant ();
if (breaking || continuing)
break;
if (returning)
break;
}
else
retval = tree_constant ();
}
return retval;
}
Octave_object
tree_statement_list::eval (int print, int nargout)
{
Octave_object retval;
if (nargout > 1)
{
int pf;
if (error_state)
return retval;
for (Pix p = first (); p != 0; next (p))
{
tree_statement *elt = this->operator () (p);
if (print == 0)
pf = 0;
else
pf = elt->print_flag;
tree_command *cmd = elt->command;
tree_expression *expr = elt->expression;
if (cmd || expr)
{
if (cmd)
cmd->eval ();
else
{
if (expr->is_multi_val_ret_expression ())
{
Octave_object args;
tree_multi_val_ret *t = (tree_multi_val_ret *) expr;
retval = t->eval (pf, nargout, args);
}
else
retval = expr->eval (pf);
}
if (error_state)
return tree_constant ();
if (breaking || continuing)
break;
if (returning)
break;
}
else
retval = Octave_object ();
}
return retval;
}
else
retval = eval (print);
return retval;
}
void
tree_statement_list::print_code (ostream& os)
{
for (Pix p = first (); p != 0; next (p))
{
tree_statement *elt = this->operator () (p);
if (elt)
elt->print_code (os);
}
}
Octave_object
tree_argument_list::convert_to_const_vector (void)
{
int len = length ();
// XXX FIXME XXX -- would be nice to know in advance how largs args
// needs to be even when we have a list containing an all_va_args
// token.
Octave_object args;
args.resize (len);
Pix p = first ();
int j = 0;
for (int k = 0; k < len; k++)
{
tree_expression *elt = this->operator () (p);
if (elt)
{
tree_constant tmp = elt->eval (0);
if (error_state)
{
::error ("evaluating argument list element number %d", k);
args = Octave_object ();
break;
}
else
{
if (tmp.is_all_va_args ())
{
if (curr_function)
{
Octave_object tva;
tva = curr_function->octave_all_va_args ();
int n = tva.length ();
for (int i = 0; i < n; i++)
args(j++) = tva(i);
}
else
{
::error ("all_va_args is only valid inside functions");
args = Octave_object ();
break;
}
}
else
args(j++) = tmp;
}
next (p);
}
else
{
args(j++) = tree_constant ();
break;
}
}
args.resize (j);
return args;
}
void
tree_argument_list::print_code (ostream& os)
{
Pix p = first ();
while (p)
{
tree_expression *elt = this->operator () (p);
next (p);
if (elt)
{
elt->print_code (os);
if (p)
os << ", ";
}
}
}
// Parameter lists.
void
tree_parameter_list::mark_as_formal_parameters (void)
{
for (Pix p = first (); p != 0; next (p))
{
tree_identifier *elt = this->operator () (p);
elt->mark_as_formal_parameter ();
}
}
void
tree_parameter_list::initialize_undefined_elements (tree_constant& val)
{
for (Pix p = first (); p != 0; next (p))
{
tree_identifier *elt = this->operator () (p);
if (! elt->is_defined ())
elt->assign (val);
}
}
void
tree_parameter_list::define_from_arg_vector (const Octave_object& args)
{
int nargin = args.length ();
if (nargin <= 0)
return;
int expected_nargin = length ();
Pix p = first ();
for (int i = 0; i < expected_nargin; i++)
{
tree_identifier *elt = this->operator () (p);
tree_constant *tmp = 0;
if (i < nargin)
{
if (args(i).is_defined () && args(i).is_magic_colon ())
{
::error ("invalid use of colon in function argument list");
return;
}
tmp = new tree_constant (args(i));
}
elt->define (tmp);
next (p);
}
}
Octave_object
tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list)
{
int nout = length ();
if (vr_list)
nout += vr_list->length ();
Octave_object retval;
retval.resize (nout);
int i = 0;
for (Pix p = first (); p != 0; next (p))
{
tree_identifier *elt = this->operator () (p);
if (elt->is_defined ())
retval(i) = elt->eval (0);
i++;
}
if (vr_list)
{
for (p = vr_list->first (); p != 0; vr_list->next (p))
{
retval(i) = vr_list->operator () (p);
i++;
}
}
return retval;
}
int
tree_parameter_list::is_defined (void)
{
int status = 1;
for (Pix p = first (); p != 0; next (p))
{
tree_identifier *elt = this->operator () (p);
if (! elt->is_defined ())
{
status = 0;
break;
}
}
return status;
}
void
tree_parameter_list::print_code (ostream& os)
{
Pix p = first ();
while (p)
{
tree_identifier *elt = this->operator () (p);
next (p);
if (elt)
{
elt->print_code (os);
if (p)
os << ", ";
}
}
}
// Return lists.
void
tree_return_list::print_code (ostream& os)
{
Pix p = first ();
while (p)
{
tree_index_expression *elt = this->operator () (p);
next (p);
if (elt)
{
elt->print_code (os);
if (p)
os << ", ";
}
}
}
// Global.
void
tree_global::eval (void)
{
if (ident)
{
ident->link_to_global ();
}
else if (assign_expr)
{
tree_identifier *id = 0;
if (assign_expr->left_hand_side_is_identifier_only ()
&& (id = assign_expr->left_hand_side_id ()))
{
id->link_to_global ();
assign_expr->eval (0);
}
else
error ("global: unable to make individual structure elements global");
}
}
void
tree_global::print_code (ostream& os)
{
if (ident)
ident->print_code (os);
if (assign_expr)
assign_expr->print_code (os);
}
// Global initializer lists.
void
tree_global_init_list::eval (void)
{
for (Pix p = first (); p != 0; next (p))
{
tree_global *t = this->operator () (p);
t->eval ();
}
}
void
tree_global_init_list::print_code (ostream& os)
{
Pix p = first ();
while (p)
{
tree_global *elt = this->operator () (p);
next (p);
if (elt)
{
elt->print_code (os);
if (p)
os << ", ";
}
}
}
// If.
int
tree_if_clause::is_else_clause (void)
{
return (! expr);
}
int
tree_if_clause::eval (void)
{
if (expr)
{
tree_constant t1 = expr->eval (0);
if (error_state || t1.is_undefined ())
return 0;
if (t1.rows () == 0 || t1.columns () == 0)
{
int flag = user_pref.propagate_empty_matrices;
if (flag < 0)
warning ("if: empty matrix used in conditional");
else if (flag == 0)
{
::error ("if: empty matrix used in conditional");
return 0;
}
t1 = tree_constant (0.0);
}
else if (! t1.is_scalar_type ())
{
tree_constant t2 = t1.all ();
t1 = t2.all ();
}
int expr_value = 0;
if (t1.is_real_scalar ())
expr_value = (int) t1.double_value ();
else if (t1.is_complex_scalar ())
expr_value = t1.complex_value () != 0.0;
else
error ("if: all (all (cond)) is not a scalar");
if (expr_value)
{
if (list)
list->eval (1);
return 1;
}
}
else
{
if (list)
list->eval (1);
return 1;
}
return 0;
}
void
tree_if_clause::print_code (ostream& os)
{
if (expr)
expr->print_code (os);
print_code_new_line (os);
increment_indent_level ();
if (list)
{
list->print_code (os);
decrement_indent_level ();
}
}
// List of if commands.
void
tree_if_command_list::eval (void)
{
for (Pix p = first (); p != 0; next (p))
{
tree_if_clause *t = this->operator () (p);
if (t->eval () || error_state)
break;
}
}
void
tree_if_command_list::print_code (ostream& os)
{
Pix p = first ();
int first_elt = 1;
while (p)
{
tree_if_clause *elt = this->operator () (p);
if (elt)
{
if (! first_elt)
{
print_code_indent (os);
if (elt->is_else_clause ())
os << "else";
else
os << "elseif ";
}
elt->print_code (os);
}
first_elt = 0;
next (p);
}
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/