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%%%----------------------------------------------------------------------
%%% File : xml.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : XML utils
%%% Created : 20 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(xml).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([element_to_string/1,
crypt/1,
remove_cdata/1,
get_cdata/1, get_tag_cdata/1,
get_attr/2, get_attr_s/2,
get_tag_attr/2, get_tag_attr_s/2,
get_subtag/2, get_subtag_cdata/2,
get_path_s/2,
replace_tag_attr/3]).
element_to_string(El) ->
case El of
{xmlelement, Name, Attrs, Els} ->
if
Els /= [] ->
[$<, Name, attrs_to_list(Attrs), $>,
[element_to_string(E) || E <- Els],
$<, $/, Name, $>];
true ->
[$<, Name, attrs_to_list(Attrs), $/, $>]
end;
{xmlcdata, CData} when list(CData) ->
crypt(CData);
%% We do not crypt CDATA binary, but we enclose it in XML CDATA
{xmlcdata, CData} when binary(CData) ->
CDATA1 = <<"<![CDATA[">>,
CDATA2 = <<"]]>">>,
concat_binary([CDATA1, CData, CDATA2])
end.
attrs_to_list(Attrs) ->
[attr_to_list(A) || A <- Attrs].
attr_to_list({Name, Value}) ->
[$\s, crypt(Name), $=, $', crypt(Value), $'].
crypt(S) when is_list(S) ->
[case C of
$& -> "&";
$< -> "<";
$> -> ">";
$" -> """;
$' -> "'";
_ -> C
end || C <- S];
crypt(S) when is_binary(S) ->
crypt(binary_to_list(S)).
remove_cdata_p({xmlelement, _Name, _Attrs, _Els}) -> true;
remove_cdata_p(_) -> false.
remove_cdata(L) -> [E || E <- L, remove_cdata_p(E)].
get_cdata(L) ->
binary_to_list(list_to_binary(get_cdata(L, ""))).
get_cdata([{xmlcdata, CData} | L], S) ->
get_cdata(L, [S, CData]);
get_cdata([_ | L], S) ->
get_cdata(L, S);
get_cdata([], S) ->
S.
get_tag_cdata({xmlelement, _Name, _Attrs, Els}) ->
get_cdata(Els).
get_attr(AttrName, Attrs) ->
case lists:keysearch(AttrName, 1, Attrs) of
{value, {_, Val}} ->
{value, Val};
_ ->
false
end.
get_attr_s(AttrName, Attrs) ->
case lists:keysearch(AttrName, 1, Attrs) of
{value, {_, Val}} ->
Val;
_ ->
""
end.
get_tag_attr(AttrName, {xmlelement, _Name, Attrs, _Els}) ->
get_attr(AttrName, Attrs).
get_tag_attr_s(AttrName, {xmlelement, _Name, Attrs, _Els}) ->
get_attr_s(AttrName, Attrs).
get_subtag({xmlelement, _, _, Els}, Name) ->
get_subtag1(Els, Name).
get_subtag1([El | Els], Name) ->
case El of
{xmlelement, Name, _, _} ->
El;
_ ->
get_subtag1(Els, Name)
end;
get_subtag1([], _) ->
false.
get_subtag_cdata(Tag, Name) ->
case get_subtag(Tag, Name) of
false ->
"";
Subtag ->
get_tag_cdata(Subtag)
end.
get_path_s(El, []) ->
El;
get_path_s(El, [{elem, Name} | Path]) ->
case get_subtag(El, Name) of
false ->
"";
SubEl ->
get_path_s(SubEl, Path)
end;
get_path_s(El, [{attr, Name}]) ->
get_tag_attr_s(Name, El);
get_path_s(El, [cdata]) ->
get_tag_cdata(El).
replace_tag_attr(Attr, Value, {xmlelement, Name, Attrs, Els}) ->
Attrs1 = lists:keydelete(Attr, 1, Attrs),
Attrs2 = [{Attr, Value} | Attrs1],
{xmlelement, Name, Attrs2, Els}.
|
