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+%%--------------------------------------------------------------------
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2010. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% 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.
+%%
+%% %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, ErroneousString}->
+ {error, Error, ErroneousString}
+ 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.