xmerl_b64bin.yrl

OTP是开放电信平台的简称

%%% The contents of this file are subject to the Erlang Public License,
%%% Version 1.0, (the "License"); you may not use this file except in
%%% compliance with the License. You may obtain a copy of the License at
%%% http://www.erlang.org/license/EPL1_0.txt
%%%
%%% Software distributed under the License is distributed on an "AS IS"
%%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%%% the License for the specific language governing rights and limitations
%%% under the License.
%%%
%%%
%%% The Initial Developer of the Original Code is Ericsson Telecom
%%% AB. Portions created by Ericsson are Copyright (C), 1998, Ericsson
%%% Telecom AB. All Rights Reserved.
%%%
%%% Contributor(s): ______________________________________.
%%%
%%%-------------------------------------------------------------------
%%% File    : xmerl_b64Bin.yrl
%%% Author  : Bertil Karlsson <bertil@finrod>
%%% Description : 
%%%
%%% Created : 30 Mar 2006 by Bertil Karlsson <bertil@finrod>
%%%-------------------------------------------------------------------

%% The base64Binary grammar is as follows:
%% Base64Binary  ::=  ((B64S B64S B64S B64S)*
%%                      ((B64S B64S B64S B64) |
%%                       (B64S B64S B16S '=') |
%%                       (B64S B04S '=' #x20? '=')))?
%%
%% B64S         ::= B64 #x20?
%%
%% B16S         ::= B16 #x20?
%%
%% B04S         ::= B04 #x20?
%%
%% B04         ::=  [AQgw]
%% (B16         ::=  [AEIMQUYcgkosw048])
%% (B64         ::=  [A-Za-z0-9+/])

%% Changes
%% B16x       ::=  [EIMUYckos048]
%% B64x       ::=  [B-DF-HJ-LN-PR-TV-XZabd-fh-jl-np-rt-vx-z1-35-79+/]

%% B16         ::=  B04 | B16x
%% B64         ::=  B04 | B16x | B64x
%% Handle whitespace in scanner

Nonterminals base64Binary base64Binary2 b64 b16.

Terminals '=' b04 b16x b64x.

Rootsymbol base64Binary.

Endsymbol '$end'.




base64Binary -> base64Binary2.
base64Binary -> '$empty'.

base64Binary2 -> b64 b64 b64 b64 base64Binary2.
base64Binary2 -> b64 b64 b64 b64.
base64Binary2 -> b64 b64 b16 '='.
base64Binary2 -> b64 b04 '=' '='.

b64          -> b04.
b64          -> b16x.
b64          -> b64x.

b16          -> b04.
b16          -> b16x.