yamerl_node_binary.erl

%-
% Copyright (c) 2012-2014 Yakaz
% Copyright (c) 2016-2022 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.
%
% 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
% FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
% DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
% OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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%% @private

-module(yamerl_node_binary).

-include("yamerl_errors.hrl").
-include("yamerl_tokens.hrl").
-include("yamerl_nodes.hrl").
-include("yamerl_constr.hrl").

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

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

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

tags() -> [?TAG].

try_construct_token(Constr, Node,
  #yamerl_scalar{tag = #yamerl_tag{uri = {non_specific, "?"}}} = Token) ->
    try
        construct_token(Constr, Node, Token)
    catch
        _:#yamerl_parsing_error{name = not_a_binary} ->
            unrecognized
    end;
try_construct_token(_, _, _) ->
    unrecognized.

construct_token(#yamerl_constr{detailed_constr = false},
  undefined, #yamerl_scalar{text = Text} = Token) ->
   case catch base64:decode(Text) of
        <<Result/bitstring>> -> {finished, Result};
        {'EXIT', _} -> exception(Token)
    end;

construct_token(#yamerl_constr{detailed_constr = true},
  undefined, #yamerl_scalar{text = Text} = Token) ->
   case catch base64:decode(Text) of
        <<Result/bitstring>> ->
          Pres = yamerl_constr:get_pres_details(Token),
          Node = #yamerl_binary{
            module = ?MODULE,
            tag    = ?TAG,
            pres   = Pres,
            data   = Result
          },
          {finished, Node};
        {'EXIT', _} -> exception(Token)
    end;

construct_token(_, _, Token) ->
    exception(Token).

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

exception(Token) ->
    Error = #yamerl_parsing_error{
      name   = not_a_binary,
      token  = Token,
      text   = "Invalid binary/Not base64",
      line   = ?TOKEN_LINE(Token),
      column = ?TOKEN_COLUMN(Token)
    },
    throw(Error).