+
−/*
+
−
+
−Copyright (C) 1996-2015 John W. Eaton
+
−
+
−This file is part of Octave.
+
−
+
−Octave is free software; you can redistribute it and/or modify it
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−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.
+
−
+
−Octave is distributed in the hope that it will be useful, but WITHOUT
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−ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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−FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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−for more details.
+
−
+
−You should have received a copy of the GNU General Public License
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−along with Octave; see the file COPYING.  If not, see
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−<http://www.gnu.org/licenses/>.
+
−
+
−*/
+
−
+
−#if ! defined (octave_pt_assign_h)
+
−#define octave_pt_assign_h 1
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−
+
−#include <iosfwd>
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−#include <string>
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−
+
−class tree_argument_list;
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−class tree_walker;
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−
+
−class octave_value;
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−class octave_value_list;
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−class octave_lvalue;
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−
+
−#include "ov.h"
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−#include "pt-exp.h"
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−#include "symtab.h"
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−
+
−// Simple assignment expressions.
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−
+
−class
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−tree_simple_assignment : public tree_expression
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−{
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−public:
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−
+
−  tree_simple_assignment (bool plhs = false, int l = -1, int c = -1,
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−                          octave_value::assign_op t = octave_value::op_asn_eq)
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−    : tree_expression (l, c), lhs (0), rhs (0), preserve (plhs), ans_ass (),
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−      etype (t) { }
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−
+
−  tree_simple_assignment (tree_expression *le, tree_expression *re,
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−                          bool plhs = false, int l = -1, int c = -1,
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−                          octave_value::assign_op t = octave_value::op_asn_eq);
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−
+
−  ~tree_simple_assignment (void);
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−
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−  bool has_magic_end (void) const { return (rhs && rhs->has_magic_end ()); }
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−
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−  bool rvalue_ok (void) const { return true; }
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−
+
−  octave_value rvalue1 (int nargout = 1);
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−
+
−  octave_value_list rvalue (int nargout);
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−
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−  bool is_assignment_expression (void) const { return true; }
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−
+
−  std::string oper (void) const;
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−
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−  tree_expression *left_hand_side (void) { return lhs; }
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−
+
−  tree_expression *right_hand_side (void) { return rhs; }
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−
+
−  tree_expression *dup (symbol_table::scope_id scope,
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−                        symbol_table::context_id context) const;
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−
+
−  void accept (tree_walker& tw);
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−
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−  octave_value::assign_op op_type (void) const { return etype; }
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−
+
−private:
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−
+
−  void do_assign (octave_lvalue& ult, const octave_value_list& args,
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−                  const octave_value& rhs_val);
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−
+
−  void do_assign (octave_lvalue& ult, const octave_value& rhs_val);
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−
+
−  // The left hand side of the assignment.
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−  tree_expression *lhs;
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−
+
−  // The right hand side of the assignment.
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−  tree_expression *rhs;
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−
+
−  // True if we should not delete the lhs.
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−  bool preserve;
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−
+
−  // True if this is an assignment to the automatic variable ans.
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−  bool ans_ass;
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−
+
−  // The type of the expression.
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−  octave_value::assign_op etype;
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−
+
−  // No copying!
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−
+
−  tree_simple_assignment (const tree_simple_assignment&);
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−
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−  tree_simple_assignment& operator = (const tree_simple_assignment&);
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−};
+
−
+
−// Multi-valued assignment expressions.
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−
+
−class
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−tree_multi_assignment : public tree_expression
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−{
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−public:
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−
+
−  tree_multi_assignment (bool plhs = false, int l = -1, int c = -1)
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−    : tree_expression (l, c), lhs (0), rhs (0), preserve (plhs) { }
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−
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−  tree_multi_assignment (tree_argument_list *lst, tree_expression *r,
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−                         bool plhs = false, int l = -1, int c = -1);
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−
+
−  ~tree_multi_assignment (void);
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−
+
−  bool has_magic_end (void) const { return (rhs && rhs->has_magic_end ()); }
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−
+
−  bool is_assignment_expression (void) const { return true; }
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−
+
−  bool rvalue_ok (void) const { return true; }
+
−
+
−  octave_value rvalue1 (int nargout = 1);
+
−
+
−  octave_value_list rvalue (int nargout);
+
−
+
−  std::string oper (void) const;
+
−
+
−  tree_argument_list *left_hand_side (void) { return lhs; }
+
−
+
−  tree_expression *right_hand_side (void) { return rhs; }
+
−
+
−  tree_expression *dup (symbol_table::scope_id scope,
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−                        symbol_table::context_id context) const;
+
−
+
−  void accept (tree_walker& tw);
+
−
+
−  octave_value::assign_op op_type (void) const
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−  { return octave_value::op_asn_eq; }
+
−
+
−private:
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−
+
−  // The left hand side of the assignment.
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−  tree_argument_list *lhs;
+
−
+
−  // The right hand side of the assignment.
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−  tree_expression *rhs;
+
−
+
−  // True if we should not delete the lhs.
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−  bool preserve;
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−
+
−  // No copying!
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−
+
−  tree_multi_assignment (const tree_multi_assignment&);
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−
+
−  tree_multi_assignment& operator = (const tree_multi_assignment&);
+
−};
+
−
+
−#endif