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