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authorBjörn Gustavsson <[email protected]>2013-10-17 15:22:49 +0200
committerBjörn Gustavsson <[email protected]>2013-10-17 15:54:29 +0200
commit719f789cebec004b350153e1f001303d6713f4a6 (patch)
tree774bd334dae867f22a6432dbda1e73cb0f36d881 /lib/asn1/src
parent20641fe0f2ea745873fc7557448d3a7deb1bd639 (diff)
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Fix complicated union of INTEGER constraints
A constraint that was an union of integer ranges: Type ::= INTEGER (lb1..ub1 | ... | lbN..ubN) would sometimes (depending on the values) not all always be properly combined to a single effective range, but would become: Type ::= INTEGER (lb2..ub2) (lb3..ub3) If that type was used in a SEQUENCE: S ::= SEQUENCE { v Type } the constraint would be simplified, taking the intersection of the ranges.
Diffstat (limited to 'lib/asn1/src')
-rw-r--r--lib/asn1/src/asn1ct_check.erl46
1 files changed, 7 insertions, 39 deletions
diff --git a/lib/asn1/src/asn1ct_check.erl b/lib/asn1/src/asn1ct_check.erl
index eddcda0018..feddda4228 100644
--- a/lib/asn1/src/asn1ct_check.erl
+++ b/lib/asn1/src/asn1ct_check.erl
@@ -4229,9 +4229,10 @@ constraint_union(S,C) when is_list(C) ->
constraint_union(_S,C) ->
[C].
-constraint_union1(S,[A={'ValueRange',_},union,B={'ValueRange',_}|Rest],Acc) ->
- AunionB = constraint_union_vr([A,B]),
- constraint_union1(S, AunionB++Rest, Acc);
+constraint_union1(S, [{'ValueRange',{Lb1,Ub1}},union,
+ {'ValueRange',{Lb2,Ub2}}|Rest], Acc) ->
+ AunionB = {'ValueRange',{c_min(Lb1, Lb2),max(Ub1, Ub2)}},
+ constraint_union1(S, [AunionB|Rest], Acc);
constraint_union1(S,[A={'SingleValue',_},union,B={'SingleValue',_}|Rest],Acc) ->
AunionB = constraint_union_sv(S,[A,B]),
constraint_union1(S,Rest,Acc ++ AunionB);
@@ -4255,42 +4256,9 @@ constraint_union_sv(_S,SV) ->
[N] -> [{'SingleValue',N}];
L -> [{'SingleValue',L}]
end.
-
-%% REMOVE????
-%%constraint_union(S,VR,'ValueRange') ->
-%% constraint_union_vr(VR).
-
-%% constraint_union_vr(VR)
-%% VR = [{'ValueRange',{Lb,Ub}},...]
-%% Lb = 'MIN' | integer()
-%% Ub = 'MAX' | integer()
-%% Returns if possible only one ValueRange tuple with a range that
-%% is a union of all ranges in VR.
-constraint_union_vr(VR) ->
- %% Sort VR by Lb in first hand and by Ub in second hand
- Fun=fun({_,{'MIN',_B1}},{_,{A2,_B2}}) when is_integer(A2)->true;
- ({_,{A1,_B1}},{_,{'MAX',_B2}}) when is_integer(A1) -> true;
- ({_,{A1,_B1}},{_,{A2,_B2}}) when is_integer(A1),is_integer(A2),A1<A2 -> true;
- ({_,{A,B1}},{_,{A,B2}}) when B1=<B2->true;
- (_,_)->false end,
- SortedVR = lists:usort(Fun,VR),
- constraint_union_vr(SortedVR, []).
-
-constraint_union_vr([],Acc) ->
- lists:reverse(Acc);
-constraint_union_vr([C|Rest],[]) ->
- constraint_union_vr(Rest,[C]);
-constraint_union_vr([{_,{Lb,Ub2}}|Rest],[{_,{Lb,_Ub1}}|Acc]) -> %Ub2 > Ub1
- constraint_union_vr(Rest,[{'ValueRange',{Lb,Ub2}}|Acc]);
-constraint_union_vr([{_,{_,Ub}}|Rest],A=[{_,{_,Ub}}|_Acc]) ->
- constraint_union_vr(Rest,A);
-constraint_union_vr([{_,{Lb2,Ub2}}|Rest], [{_,{Lb1,Ub1}}|Acc])
- when Ub1 =< Lb2, Ub1 < Ub2 ->
- constraint_union_vr(Rest,[{'ValueRange',{Lb1,Ub2}}|Acc]);
-constraint_union_vr([{_,{_,Ub2}}|Rest],A=[{_,{_,Ub1}}|_Acc]) when Ub2=<Ub1->
- constraint_union_vr(Rest,A);
-constraint_union_vr([VR|Rest],Acc) ->
- constraint_union_vr(Rest,[VR|Acc]).
+c_min('MIN', _) -> 'MIN';
+c_min(_, 'MIN') -> 'MIN';
+c_min(A, B) -> min(A, B).
union_sv_vr(_S,{'SingleValue',SV},VR)
when is_integer(SV) ->