Mercurial > octave
view libinterp/parse-tree/pt-assign.h @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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/* Copyright (C) 1996-2020 The Octave Project Developers See the file COPYRIGHT.md in the top-level directory of this distribution or <https://octave.org/COPYRIGHT.html/>. 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */ #if ! defined (octave_pt_assign_h) #define octave_pt_assign_h 1 #include "octave-config.h" #include <iosfwd> #include <string> class octave_value; class octave_value_list; #include "ov.h" #include "pt-exp.h" #include "pt-walk.h" namespace octave { class symbol_scope; class octave_lvalue; class tree_argument_list; // Simple assignment expressions. class tree_simple_assignment : public tree_expression { public: tree_simple_assignment (bool plhs = false, int l = -1, int c = -1, octave_value::assign_op t = octave_value::op_asn_eq) : tree_expression (l, c), m_lhs (nullptr), m_rhs (nullptr), m_preserve (plhs), m_ans_assign (), m_etype (t) { } tree_simple_assignment (tree_expression *le, tree_expression *re, bool plhs = false, int l = -1, int c = -1, octave_value::assign_op t = octave_value::op_asn_eq); // No copying! tree_simple_assignment (const tree_simple_assignment&) = delete; tree_simple_assignment& operator = (const tree_simple_assignment&) = delete; ~tree_simple_assignment (void); bool has_magic_end (void) const { return (m_rhs && m_rhs->has_magic_end ()); } bool rvalue_ok (void) const { return true; } bool is_assignment_expression (void) const { return true; } std::string oper (void) const; tree_expression * left_hand_side (void) { return m_lhs; } tree_expression * right_hand_side (void) { return m_rhs; } tree_expression * dup (symbol_scope& scope) const; octave_value evaluate (tree_evaluator& tw, int nargout = 1); octave_value_list evaluate_n (tree_evaluator& tw, int nargout = 1) { return ovl (evaluate (tw, nargout)); } void accept (tree_walker& tw) { tw.visit_simple_assignment (*this); } octave_value::assign_op op_type (void) const { return m_etype; } private: void do_assign (octave_lvalue& ult, const octave_value_list& args, const octave_value& rhs_val); void do_assign (octave_lvalue& ult, const octave_value& rhs_val); // The left hand side of the assignment. tree_expression *m_lhs; // The right hand side of the assignment. tree_expression *m_rhs; // True if we should not delete the lhs. bool m_preserve; // True if this is an assignment to the automatic variable ans. bool m_ans_assign; // The type of the expression. octave_value::assign_op m_etype; }; // Multi-valued assignment expressions. class tree_multi_assignment : public tree_expression { public: tree_multi_assignment (bool plhs = false, int l = -1, int c = -1) : tree_expression (l, c), m_lhs (nullptr), m_rhs (nullptr), m_preserve (plhs) { } tree_multi_assignment (tree_argument_list *lst, tree_expression *r, bool plhs = false, int l = -1, int c = -1); // No copying! tree_multi_assignment (const tree_multi_assignment&) = delete; tree_multi_assignment& operator = (const tree_multi_assignment&) = delete; ~tree_multi_assignment (void); bool has_magic_end (void) const { return (m_rhs && m_rhs->has_magic_end ()); } bool is_assignment_expression (void) const { return true; } bool rvalue_ok (void) const { return true; } std::string oper (void) const; tree_argument_list * left_hand_side (void) { return m_lhs; } tree_expression * right_hand_side (void) { return m_rhs; } tree_expression * dup (symbol_scope& scope) const; octave_value evaluate (tree_evaluator& tw, int nargout = 1) { octave_value_list retval = evaluate_n (tw, nargout); return retval.length () > 0 ? retval(0) : octave_value (); } octave_value_list evaluate_n (tree_evaluator& tw, int nargout = 1); void accept (tree_walker& tw) { tw.visit_multi_assignment (*this); } octave_value::assign_op op_type (void) const { return octave_value::op_asn_eq; } private: // The left hand side of the assignment. tree_argument_list *m_lhs; // The right hand side of the assignment. tree_expression *m_rhs; // True if we should not delete the lhs. bool m_preserve; }; } #endif