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%%--------------------------------------------------------------------
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%----------------------------------------------------------------------
%% File : ct_config_xml.erl
%% Description : CT callback module for reading configs from XML files
%%
%% Created : 16 February 2010
%%----------------------------------------------------------------------
-module(ct_config_xml).
-export([read_config/1, check_parameter/1]).
% read config file
read_config(ConfigFile) ->
case catch do_read_xml_config(ConfigFile) of
{ok,Config} ->
{ok,Config};
Error = {error,_} ->
Error
end.
% check file exists
check_parameter(File) ->
case filelib:is_file(File) of
true ->
{ok,{file,File}};
false ->
{error,{nofile,File}}
end.
% actual reading of the config
do_read_xml_config(ConfigFile) ->
case catch xmerl_sax_parser:file(ConfigFile,
[{event_fun,fun event/3},
{event_state,[]}]) of
{ok,EntityList,_} ->
{ok,lists:reverse(transform_entity_list(EntityList))};
Oops ->
{error,{parsing_failed,Oops}}
end.
% event callback for xmerl_sax_parser
event(Event, _LineNo, State) ->
tag(Event, State).
% document start
tag(startDocument, State) ->
State;
% start of the config
tag({startElement, _Uri, "config", _QName, _Attributes}, []) ->
[{"config", []}];
% start tag
tag({startElement, _Uri, Name, _QName, _Attributes}, Tags) ->
[{Name, []}|Tags];
% value
tag({characters, String}, [{Tag, _Value}|Tags]) ->
[{Tag, String}|Tags];
% end tag
tag({endElement, _Uri, _Name, _QName},
[Entity, {PrevEntityTag, PrevEntityValue}|Tags]) ->
NewHead = {PrevEntityTag, [Entity|PrevEntityValue]},
[NewHead|Tags];
% end of the config
tag({endElement, _Uri, "config", _QName}, [{"config", Config}]) ->
Config;
% end of document, return result
tag(endDocument, {_Tags, Result}) ->
Result;
% default
tag(_El, State) ->
State.
% transform of the ugly deeply nested entity list to the key-value "tree"
transform_entity_list(EntityList) ->
lists:map(fun transform_entity/1, EntityList).
% transform entity from {list(), list()} to {atom(), term()}
transform_entity({Tag, [Value|Rest]}) when
is_tuple(Value) ->
{list_to_atom(Tag), transform_entity_list(lists:reverse([Value|Rest]))};
transform_entity({Tag, String}) ->
case list_to_term(String) of
{ok, Value} ->
{list_to_atom(Tag), Value};
Error ->
throw(Error)
end.
% transform a string with Erlang terms
list_to_term(String) ->
{ok, T, _} = erl_scan:string(String++"."),
case catch erl_parse:parse_term(T) of
{ok,Term} ->
{ok,Term};
Error ->
{error,{Error,String}}
end.
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