////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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_pr_code_h)
#define octave_pt_pr_code_h 1

#include "octave-config.h"

#include <stack>
#include <string>

#include "pt-walk.h"

namespace octave
{
  class comment_elt;
  class comment_list;
  class tree_decl_command;
  class tree_expression;

  // How to print the code that the parse trees represent.

  class tree_print_code : public tree_walker
  {
  public:

    tree_print_code (std::ostream& os_arg,
                     const std::string& pfx = "",
                     bool pr_orig_txt = true)
      : m_os (os_arg), m_prefix (pfx), m_nesting (),
        m_print_original_text (pr_orig_txt),
        m_curr_print_indent_level (0), m_beginning_of_line (true),
        m_suppress_newlines (0)
    {
      // For "none".
      m_nesting.push ('n');
    }

    // No copying!

    tree_print_code (const tree_print_code&) = delete;

    tree_print_code& operator = (const tree_print_code&) = delete;

    ~tree_print_code (void) = default;

    void visit_anon_fcn_handle (tree_anon_fcn_handle&);

    void visit_argument_list (tree_argument_list&);

    void visit_binary_expression (tree_binary_expression&);

    void visit_break_command (tree_break_command&);

    void visit_colon_expression (tree_colon_expression&);

    void visit_continue_command (tree_continue_command&);

    void visit_decl_command (tree_decl_command&);

    void visit_decl_init_list (tree_decl_init_list&);

    void visit_decl_elt (tree_decl_elt&);

    void visit_simple_for_command (tree_simple_for_command&);

    void visit_complex_for_command (tree_complex_for_command&);

    void visit_octave_user_script (octave_user_script&);

    void visit_octave_user_function (octave_user_function&);

    void visit_octave_user_function_header (octave_user_function&);

    void visit_octave_user_function_trailer (octave_user_function&);

    void visit_function_def (tree_function_def&);

    void visit_identifier (tree_identifier&);

    void visit_if_clause (tree_if_clause&);

    void visit_if_command (tree_if_command&);

    void visit_if_command_list (tree_if_command_list&);

    void visit_index_expression (tree_index_expression&);

    void visit_matrix (tree_matrix&);

    void visit_cell (tree_cell&);

    void visit_multi_assignment (tree_multi_assignment&);

    void visit_no_op_command (tree_no_op_command&);

    void visit_constant (tree_constant&);

    void visit_fcn_handle (tree_fcn_handle&);

    void visit_parameter_list (tree_parameter_list&);

    void visit_postfix_expression (tree_postfix_expression&);

    void visit_prefix_expression (tree_prefix_expression&);

    void visit_return_command (tree_return_command&);

    void visit_simple_assignment (tree_simple_assignment&);

    void visit_statement (tree_statement&);

    void visit_statement_list (tree_statement_list&);

    void visit_switch_case (tree_switch_case&);

    void visit_switch_command (tree_switch_command&);

    void visit_try_catch_command (tree_try_catch_command&);

    void visit_unwind_protect_command (tree_unwind_protect_command&);

    void visit_while_command (tree_while_command&);

    void visit_do_until_command (tree_do_until_command&);

    void visit_superclass_ref (tree_superclass_ref&);

    void visit_metaclass_query (tree_metaclass_query&);

    void print_fcn_handle_body (tree_expression *);

  private:

    std::ostream& m_os;

    std::string m_prefix;

    std::stack<char> m_nesting;

    bool m_print_original_text;

    // Current indentation.
    int m_curr_print_indent_level;

    // TRUE means we are at the beginning of a line.
    bool m_beginning_of_line;

    // Nonzero means we are not printing newlines and indenting.
    int m_suppress_newlines;

    void reset_indent_level (void) { m_curr_print_indent_level = 0; }

    void increment_indent_level (void) { m_curr_print_indent_level += 2; }

    void decrement_indent_level (void) { m_curr_print_indent_level -= 2; }

    void newline (const char *alt_txt = ", ");

    void indent (void);

    void reset (void);

    void print_parens (const tree_expression& expr, const char *txt);

    void print_comment_list (comment_list *comment_list);

    void print_comment_elt (const comment_elt& comment_elt);

    void print_indented_comment (comment_list *comment_list);

    // Must create with an output stream!

    tree_print_code (void);
  };
}

#endif
