81 lines
2.1 KiB
Erlang
81 lines
2.1 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : xml_stream.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose :
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%%% Created : 17 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(xml_stream).
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-author('alexey@sevcom.net').
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-vsn('$Revision$ ').
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-export([start/1, init/1, send_text/2]).
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-define(XML_START, 0).
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-define(XML_END, 1).
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-define(XML_CDATA, 2).
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-define(XML_ERROR, 3).
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start(CallbackPid) ->
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spawn(?MODULE, init, [CallbackPid]).
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init(CallbackPid) ->
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Port = open_port({spawn, expat_erl}, [binary]),
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loop(CallbackPid, Port, []).
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loop(CallbackPid, Port, Stack) ->
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receive
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{Port, {data, Bin}} ->
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Data = binary_to_term(Bin),
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loop(CallbackPid, Port, process_data(CallbackPid, Stack, Data));
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{_From, {send, Str}} ->
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Port ! {self(), {command, Str}},
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loop(CallbackPid, Port, Stack)
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end.
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process_data(CallbackPid, Stack, Data) ->
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case Data of
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{?XML_START, {Name, Attrs}} ->
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if Stack == [] ->
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gen_fsm:send_event(CallbackPid,
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{xmlstreamstart, Name, Attrs});
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true -> true
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end,
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[{xmlelement, Name, Attrs, []} | Stack];
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{?XML_END, EndName} ->
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case Stack of
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[{xmlelement, Name, Attrs, Els} | Tail] ->
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NewEl = {xmlelement, Name, Attrs, lists:reverse(Els)},
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Len = length(Tail),
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if
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Len > 1 -> add_subelement(NewEl, Tail);
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Len == 1 ->
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gen_fsm:send_event(CallbackPid,
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{xmlstreamelement, NewEl}),
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Tail;
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Len == 0 ->
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gen_fsm:send_event(CallbackPid,
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{xmlstreamend, EndName}),
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Tail
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end
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end;
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{?XML_CDATA, CData} ->
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add_subelement({xmlcdata, CData}, Stack);
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{?XML_ERROR, Err} -> gen_fsm:send_event(CallbackPid,
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{xmlstreamerror, Err})
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end.
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add_subelement(El, Stack) ->
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case Stack of
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[{xmlelement, Name, Attrs, Els} | Tail] ->
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[{xmlelement, Name, Attrs, [El | Els]} | Tail];
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[] -> []
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end.
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send_text(Pid, Text) ->
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Pid ! {self(), {send, Text}}.
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