%-
% Copyright (c) 2012-2014 Yakaz
% Copyright (c) 2016-2017 Jean-Sébastien Pédron <jean-sebastien.pedron@dumbbell.fr>
% All rights reserved.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions
% are met:
% 1. Redistributions of source code must retain the above copyright
%    notice, this list of conditions and the following disclaimer.
% 2. Redistributions in binary form must reproduce the above copyright
%    notice, this list of conditions and the following disclaimer in the
%    documentation and/or other materials provided with the distribution.
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% THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
% ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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% DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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% SUCH DAMAGE.

%% @private

-module(yamerl_node_null_json).

-include("yamerl_tokens.hrl").
-include("yamerl_nodes.hrl").
-include("internal/yamerl_constr.hrl").

%% Public API.
-export([
    tags/0,
    try_construct_token/3,
    construct_token/3,
    node_pres/1
  ]).

-define(TAG, "tag:yaml.org,2002:null").

%% -------------------------------------------------------------------
%% Public API.
%% -------------------------------------------------------------------

tags() -> [?TAG].

try_construct_token(Constr, Node,
  #yamerl_scalar{tag = #yamerl_tag{uri = {non_specific, "?"}},
  text = "null"} = Token) ->
    construct_token(Constr, Node, Token);
try_construct_token(_, _, _) ->
    unrecognized.

construct_token(#yamerl_constr{detailed_constr = false},
  undefined, #yamerl_scalar{}) ->
    {finished, null};
construct_token(#yamerl_constr{detailed_constr = true},
  undefined, #yamerl_scalar{} = Token) ->
    Pres = yamerl_constr:get_pres_details(Token),
    Node = #yamerl_null{
      module = ?MODULE,
      tag    = ?TAG,
      pres   = Pres
    },
    {finished, Node}.

node_pres(Node) ->
    ?NODE_PRES(Node).