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bpe src ext bpe_xml.erl
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src/ext/bpe_xml.erl 

-module(bpe_xml).

-include_lib("bpe/include/bpe.hrl").

-include_lib("xmerl/include/xmerl.hrl").

-compile(export_all).

-import(lists,[keyfind/3, keyreplace/4]).



attr(E) -> [ {N,V} || #xmlAttribute{name=N,value=V} <- E].



%%It is expected that bpmn:flowNodeRef are present only in bpmn:lane and only #xmlText{} and #xmlElement{name='bpmn:flowNodeRef'} are present there 

find(E=[#xmlText{}, #xmlElement{name='bpmn:flowNodeRef'} | _],[]) ->

  [ {X,[],{value,V}} || #xmlElement{name=X,content=[#xmlText{value=V}]} <- E];

find(E,[]) -> [ {X,find(Sub,[]),attr(A)} || #xmlElement{name=X,attributes=A,content=Sub} <- E];

find(E, I) -> [ {X,find(Sub,[]),attr(A)} || #xmlElement{name=X,attributes=A,content=Sub} <- E, X == I].



def() -> load("priv/sample.bpmn").



load(File) -> load(File, ?MODULE).



load(File,Module) ->

  {ok,Bin} = file:read_file(File),

  _Y = {#xmlElement{name=N,content=C}=_X,_} = xmerl_scan:string(binary_to_list(Bin)),

  _E = {'bpmn:definitions',[{'bpmn:process',Elements,Attrs}],_} = {N,find(C,'bpmn:process'),attr(C)},

  Name = proplists:get_value(id,Attrs),

  Proc = reduce(Elements,#process{name=Name},Module),

  Tasks = fillInOut(Proc#process.tasks, Proc#process.flows),

  Tasks1 = fixRoles(Tasks, Proc#process.roles),

  Proc#process{ id=[],

                tasks = Tasks1,

                roles=[],

                events = [ #boundaryEvent{name='*', timeout=#timeout{spec={0,{0,30,0}}}}

                         | Proc#process.events ] }.



reduce([], Acc, _Module) ->

  Acc;



reduce([{'bpmn:task',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#task{module=Module,name=Name}|Tasks]}, Module);



reduce([{'bpmn:startEvent',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#beginEvent{module=Module,name=Name}|Tasks],beginEvent=Name}, Module);



reduce([{'bpmn:endEvent',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#endEvent{module=Module,name=Name}|Tasks],endEvent=Name}, Module);



reduce([{'bpmn:sequenceFlow',_Body,Attrs}|T],#process{flows=Flows} = Process, Module) ->

  Name   = proplists:get_value(id,Attrs),

  Source = proplists:get_value(sourceRef,Attrs),

  Target = proplists:get_value(targetRef,Attrs),

  reduce(T,Process#process{flows=[#sequenceFlow{name=Name,source=Source,target=Target}|Flows]}, Module);



reduce([{'bpmn:parallelGateway',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#gateway{module=Module,name=Name,type=parallel}|Tasks]}, Module);



reduce([{'bpmn:exclusiveGateway',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#gateway{module=Module,name=Name,type=exclusive}|Tasks]}, Module);



reduce([{'bpmn:inclusiveGateway',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#gateway{module=Module,name=Name,type=inclusive}|Tasks]}, Module);



reduce([{'bpmn:complexGateway',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#gateway{module=Module,name=Name,type=complex}|Tasks]}, Module);



reduce([{'bpmn:gateway',_Body,Attrs}|T],#process{tasks=Tasks} = Process, Module) ->

  Name = proplists:get_value(id,Attrs),

  reduce(T,Process#process{tasks=[#gateway{module=Module,name=Name,type=none}|Tasks]}, Module);



reduce([{'bpmn:laneSet',Lanes,_Attrs}|T], Process, Module) ->

  reduce(T,Process#process{roles = Lanes}, Module);



%%TODO? Maybe add support for those intries and remove them from this guard

reduce([{SkipType,_Body,_Attrs}|T],#process{} = Process, Module)

  when SkipType == 'bpmn:dataObjectReference';

       SkipType == 'bpmn:dataObject';

       SkipType == 'bpmn:association';

       SkipType == 'bpmn:textAnnotation' ->

  skip,

  reduce(T,Process, Module).



%%TODO?: Maybe use incoming/outgoing from XML itself instead of fillInOut

fillInOut(Tasks, []) -> Tasks;

fillInOut(Tasks, [#sequenceFlow{name=Name,source=Source,target=Target}|Flows]) ->

  Tasks1 = key_push_value(Name, #gateway.out, Source, #gateway.name, Tasks),

  Tasks2 = key_push_value(Name, #gateway.in,  Target, #gateway.name, Tasks1),

  fillInOut(Tasks2, Flows). 



key_push_value(Value, ValueKey, ElemId, ElemIdKey, List) ->

  Elem = keyfind(ElemId, ElemIdKey, List),

  RecName = hd(tuple_to_list(Elem)),

  if 

    RecName == beginEvent -> List;

    RecName == endEvent -> List;

    true ->

      NewElem = setelement(ValueKey, Elem, [Value|element(ValueKey,Elem)]),

      keyreplace(ElemId, ElemIdKey, List, NewElem)

  end.



fixRoles(Tasks, []) -> Tasks;

fixRoles(Tasks, [Lane|Lanes]) ->

  LaneAttributes = element(3,Lane),

  RoleName = proplists:get_value(name,LaneAttributes),

  Role = list_to_atom(RoleName),

  TaskIdsToUpdateRoles = [T || {'bpmn:flowNodeRef',[],{value,T}} <- element(2,Lane)],

  fixRoles(update_roles(TaskIdsToUpdateRoles, Tasks, Role), Lanes).



update_roles([], AllTasks, _Role) -> AllTasks;

update_roles([TaskId|Rest], AllTasks, Role) ->

  update_roles(Rest,key_push_value(Role, #task.roles, TaskId, #task.name, AllTasks),Role).



action({request,_,_},P) -> {reply,P}.



auth(_) -> true.