////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2017-2021 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 (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include "pt-all.h"

namespace octave
{
  void tree_walker::visit_anon_fcn_handle (tree_anon_fcn_handle& afh)
  {
    tree_parameter_list *parameter_list = afh.parameter_list ();

    if (parameter_list)
      parameter_list->accept (*this);

    tree_expression *expression = afh.expression ();

    if (expression)
      expression->accept (*this);
  }

  void tree_walker::visit_argument_list (tree_argument_list& lst)
  {
    auto p = lst.begin ();

    while (p != lst.end ())
      {
        tree_expression *elt = *p++;

        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_arguments_block (tree_arguments_block& blk)
  {
    tree_args_block_attribute_list *attribute_list = blk.attribute_list ();

    if (attribute_list)
      attribute_list->accept (*this);

    tree_args_block_validation_list *validation_list = blk.validation_list ();

    if (validation_list)
      validation_list->accept (*this);
  }

  void tree_walker::visit_args_block_attribute_list (tree_args_block_attribute_list& lst)
  {
    tree_identifier *attribute = lst.attribute ();

    if (attribute)
      attribute->accept (*this);
  }

  void tree_walker::visit_args_block_validation_list (tree_args_block_validation_list& lst)
  {
    for (auto *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_arg_validation (tree_arg_validation& val)
  {
    tree_expression *arg_name = val.identifier_expression ();

    if (arg_name)
      arg_name->accept (*this);

    tree_arg_size_spec *size_spec = val.size_spec ();

    if (size_spec)
      size_spec->accept (*this);

    tree_identifier *class_name = val.class_name ();

    if (class_name)
      class_name->accept (*this);

    tree_arg_validation_fcns *validation_fcns = val.validation_fcns ();

    if (validation_fcns)
      validation_fcns->accept (*this);

    tree_expression *default_value = val.initializer_expression ();

    if (default_value)
      default_value->accept (*this);
  }

  void tree_walker::visit_arg_size_spec (tree_arg_size_spec& spec)
  {
    tree_argument_list *size_args = spec.size_args ();

    if (size_args)
      size_args->accept (*this);
  }

  void tree_walker::visit_arg_validation_fcns (tree_arg_validation_fcns& spec)
  {
    tree_argument_list *fcn_args = spec.fcn_args ();

    if (fcn_args)
      fcn_args->accept (*this);
  }

  void tree_walker::visit_binary_expression (tree_binary_expression& expr)
  {
    tree_expression *op1 = expr.lhs ();

    if (op1)
      op1->accept (*this);

    tree_expression *op2 = expr.rhs ();

    if (op2)
      op2->accept (*this);
  }

  void tree_walker::visit_boolean_expression (tree_boolean_expression& expr)
  {
    visit_binary_expression (expr);
  }

  void tree_walker::visit_compound_binary_expression (tree_compound_binary_expression& expr)
  {
    visit_binary_expression (expr);
  }

  void tree_walker::visit_break_command (tree_break_command&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_colon_expression (tree_colon_expression& expr)
  {
    tree_expression *op1 = expr.base ();

    if (op1)
      op1->accept (*this);

    tree_expression *op3 = expr.increment ();

    if (op3)
      op3->accept (*this);

    tree_expression *op2 = expr.limit ();

    if (op2)
      op2->accept (*this);
  }

  void tree_walker::visit_continue_command (tree_continue_command&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_decl_command (tree_decl_command& cmd)
  {
    tree_decl_init_list *init_list = cmd.initializer_list ();

    if (init_list)
      init_list->accept (*this);
  }

  void tree_walker::visit_decl_elt (tree_decl_elt& cmd)
  {
    tree_identifier *id = cmd.ident ();

    if (id)
      id->accept (*this);

    tree_expression *expr = cmd.expression ();

    if (expr)
      expr->accept (*this);
  }

  void tree_walker::visit_decl_init_list (tree_decl_init_list& lst)
  {
    // FIXME: tree_decl_elt is not derived from tree, so should it
    // really have an accept method?

    for (tree_decl_elt *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_simple_for_command (tree_simple_for_command& cmd)
  {
    tree_expression *lhs = cmd.left_hand_side ();

    if (lhs)
      lhs->accept (*this);

    tree_expression *expr = cmd.control_expr ();

    if (expr)
      expr->accept (*this);

    tree_expression *maxproc = cmd.maxproc_expr ();

    if (maxproc)
      maxproc->accept (*this);

    tree_statement_list *list = cmd.body ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_complex_for_command (tree_complex_for_command& cmd)
  {
    tree_argument_list *lhs = cmd.left_hand_side ();

    if (lhs)
      lhs->accept (*this);

    tree_expression *expr = cmd.control_expr ();

    if (expr)
      expr->accept (*this);

    tree_statement_list *list = cmd.body ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_spmd_command (tree_spmd_command& cmd)
  {
    tree_statement_list *body = cmd.body ();

    if (body)
      body->accept (*this);
  }

  void tree_walker::visit_octave_user_script (octave_user_script& fcn)
  {
    tree_statement_list *cmd_list = fcn.body ();

    if (cmd_list)
      cmd_list->accept (*this);
  }

  void tree_walker::visit_octave_user_function (octave_user_function& fcn)
  {
    tree_statement_list *cmd_list = fcn.body ();

    if (cmd_list)
      cmd_list->accept (*this);
  }

  void tree_walker::visit_function_def (tree_function_def& fdef)
  {
    octave_value fcn = fdef.function ();

    octave_function *f = fcn.function_value ();

    if (f)
      f->accept (*this);
  }

  void tree_walker::visit_identifier (tree_identifier&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_if_clause (tree_if_clause& cmd)
  {
    tree_expression *expr = cmd.condition ();

    if (expr)
      expr->accept (*this);

    tree_statement_list *list = cmd.commands ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_if_command (tree_if_command& cmd)
  {
    tree_if_command_list *list = cmd.cmd_list ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_if_command_list (tree_if_command_list& lst)
  {
    auto p = lst.begin ();

    while (p != lst.end ())
      {
        tree_if_clause *elt = *p++;

        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_switch_case (tree_switch_case& cs)
  {
    tree_expression *label = cs.case_label ();

    if (label)
      label->accept (*this);

    tree_statement_list *list = cs.commands ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_switch_case_list (tree_switch_case_list& lst)
  {
    auto p = lst.begin ();

    while (p != lst.end ())
      {
        tree_switch_case *elt = *p++;

        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_switch_command (tree_switch_command& cmd)
  {
    tree_expression *expr = cmd.switch_value ();

    if (expr)
      expr->accept (*this);

    tree_switch_case_list *list = cmd.case_list ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_index_expression (tree_index_expression& expr)
  {
    tree_expression *e = expr.expression ();

    if (e)
      e->accept (*this);

    std::list<tree_argument_list *> arg_lists = expr.arg_lists ();
    std::list<string_vector> arg_names = expr.arg_names ();
    std::list<tree_expression *> dyn_fields = expr.dyn_fields ();

    auto p_arg_lists = arg_lists.begin ();
    auto p_arg_names = arg_names.begin ();
    auto p_dyn_fields = dyn_fields.begin ();

    std::string type_tags = expr.type_tags ();
    int n = type_tags.length ();

    for (int i = 0; i < n; i++)
      {
        switch (type_tags[i])
          {
          case '(':
          case '{':
            {
              tree_argument_list *l = *p_arg_lists;
              if (l)
                l->accept (*this);
            }
            break;

          case '.':
            {
              std::string fn = (*p_arg_names)(0);
              if (fn.empty ())
                {
                  tree_expression *df = *p_dyn_fields;
                  if (df)
                    df->accept (*this);
                }
            }
            break;

          default:
            panic_impossible ();
          }

        p_arg_lists++;
        p_arg_names++;
        p_dyn_fields++;
      }
  }

  void tree_walker::visit_matrix (tree_matrix& lst)
  {
    auto p = lst.begin ();

    while (p != lst.end ())
      {
        tree_argument_list *elt = *p++;

        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_cell (tree_cell& lst)
  {
    auto p = lst.begin ();

    while (p != lst.end ())
      {
        tree_argument_list *elt = *p++;

        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_multi_assignment (tree_multi_assignment& expr)
  {
    tree_argument_list *lhs = expr.left_hand_side ();

    if (lhs)
      lhs->accept (*this);

    tree_expression *rhs = expr.right_hand_side ();

    if (rhs)
      rhs->accept (*this);
  }

  void tree_walker::visit_no_op_command (tree_no_op_command&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_constant (tree_constant&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_fcn_handle (tree_fcn_handle&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_parameter_list (tree_parameter_list& lst)
  {
    auto p = lst.begin ();

    while (p != lst.end ())
      {
        tree_decl_elt *elt = *p++;

        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_postfix_expression (tree_postfix_expression& expr)
  {
    tree_expression *e = expr.operand ();

    if (e)
      e->accept (*this);
  }

  void tree_walker::visit_prefix_expression (tree_prefix_expression& expr)
  {
    tree_expression *e = expr.operand ();

    if (e)
      e->accept (*this);
  }

  void tree_walker::visit_return_command (tree_return_command&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_simple_assignment (tree_simple_assignment& expr)
  {
    tree_expression *lhs = expr.left_hand_side ();

    if (lhs)
      lhs->accept (*this);

    tree_expression *rhs = expr.right_hand_side ();

    if (rhs)
      rhs->accept (*this);
  }

  void tree_walker::visit_statement (tree_statement& stmt)
  {
    tree_command *cmd = stmt.command ();

    if (cmd)
      cmd->accept (*this);
    else
      {
        tree_expression *expr = stmt.expression ();

        if (expr)
          expr->accept (*this);
      }
  }

  void tree_walker::visit_statement_list (tree_statement_list& lst)
  {
    for (tree_statement *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_try_catch_command (tree_try_catch_command& cmd)
  {
    tree_statement_list *try_code = cmd.body ();

    if (try_code)
      try_code->accept (*this);

    tree_identifier *expr_id = cmd.identifier ();

    if (expr_id)
      expr_id->accept (*this);

    tree_statement_list *catch_code = cmd.cleanup ();

    if (catch_code)
      catch_code->accept (*this);
  }

  void tree_walker::visit_unwind_protect_command (tree_unwind_protect_command& cmd)
  {
    tree_statement_list *unwind_protect_code = cmd.body ();

    if (unwind_protect_code)
      unwind_protect_code->accept (*this);

    tree_statement_list *cleanup_code = cmd.cleanup ();

    if (cleanup_code)
      cleanup_code->accept (*this);
  }

  void tree_walker::visit_while_command (tree_while_command& cmd)
  {
    tree_expression *expr = cmd.condition ();

    if (expr)
      expr->accept (*this);

    tree_statement_list *list = cmd.body ();

    if (list)
      list->accept (*this);
  }

  void tree_walker::visit_do_until_command (tree_do_until_command& cmd)
  {
    tree_statement_list *list = cmd.body ();

    if (list)
      list->accept (*this);

    tree_expression *expr = cmd.condition ();

    if (expr)
      expr->accept (*this);
  }

  void tree_walker::visit_superclass_ref (tree_superclass_ref&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_metaclass_query (tree_metaclass_query&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_classdef_attribute (tree_classdef_attribute& attr)
  {
    tree_identifier *id = attr.ident ();

    if (id)
      id->accept (*this);

    tree_expression *expr = attr.expression ();

    if (expr)
      expr->accept (*this);
  }

  void tree_walker::visit_classdef_attribute_list (tree_classdef_attribute_list& lst)
  {
    for (auto *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_classdef_superclass (tree_classdef_superclass&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_classdef_superclass_list (tree_classdef_superclass_list& lst)
  {
    for (auto *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_classdef_property (tree_classdef_property&)
  {
    // FIXME: Should we operate on the tree_arg_validation object or the
    // identifier and expression parts separately?
  }

  void tree_walker::visit_classdef_property_list (tree_classdef_property_list& lst)
  {
    for (auto *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_classdef_properties_block (tree_classdef_properties_block& blk)
  {
    tree_classdef_property_list *property_list = blk.element_list ();

    if (property_list)
      property_list->accept (*this);
  }

  void tree_walker::visit_classdef_methods_list (tree_classdef_methods_list& lst)
  {
    for (auto ov_meth : lst)
      {
        octave_user_function *meth = ov_meth.user_function_value ();

        if (meth)
          meth->accept (*this);
      }
  }

  void tree_walker::visit_classdef_methods_block (tree_classdef_methods_block& blk)
  {
    tree_classdef_methods_list *methods_list = blk.element_list ();

    if (methods_list)
      methods_list->accept (*this);
  }

  void tree_walker::visit_classdef_event (tree_classdef_event&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_classdef_events_list (tree_classdef_events_list& lst)
  {
    for (auto *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_classdef_events_block (tree_classdef_events_block& blk)
  {
    tree_classdef_events_list *events_list = blk.element_list ();

    if (events_list)
      events_list->accept (*this);
  }

  void tree_walker::visit_classdef_enum (tree_classdef_enum&)
  {
    // Nothing to do.
  }

  void tree_walker::visit_classdef_enum_list (tree_classdef_enum_list& lst)
  {
    for (auto *elt : lst)
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_classdef_enum_block (tree_classdef_enum_block& blk)
  {
    tree_classdef_enum_list *enum_list = blk.element_list ();

    if (enum_list)
      enum_list->accept (*this);
  }

  void tree_walker::visit_classdef_body (tree_classdef_body& body)
  {
    for (auto *elt : body.properties_list ())
      {
        if (elt)
          elt->accept (*this);
      }

    for (auto *elt : body.methods_list ())
      {
        if (elt)
          elt->accept (*this);
      }


    for (auto *elt : body.events_list ())
      {
        if (elt)
          elt->accept (*this);
      }

    for (auto *elt : body.enum_list ())
      {
        if (elt)
          elt->accept (*this);
      }
  }

  void tree_walker::visit_classdef (tree_classdef& cdef)
  {
    tree_classdef_attribute_list *attribute_list = cdef.attribute_list ();

    if (attribute_list)
      attribute_list->accept (*this);

    tree_identifier *ident = cdef.ident ();

    if (ident)
      ident->accept (*this);

    tree_classdef_superclass_list *superclass_list = cdef.superclass_list ();

    if (superclass_list)
      superclass_list->accept (*this);

    tree_classdef_body *body = cdef.body ();

    if (body)
      body->accept (*this);
  }
}