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BeginPackage["Errors`"];
PrintError::usage = "";
ThrowError::usage = "";
KrancError::usage = "";
VerifyString;
VerifyStringList;
VerifyList;
InfoMessage;
Quiet = 0;
Warnings = 1
Terse = 2;
Info = 3;
Full = 4;
Begin["`Private`"];
debugLevel = Terse;
removeBits[l_] :=
Module[{s, t},
t = Select[l, ! (MatchQ[#, HoldForm[Module[___]]] ||
MatchQ[#, HoldForm[CompoundExpression[___]]]) &];
s = If[Length[t] != 0, Drop[t, -1], t];
Map[# /. HoldForm[h_[args___]] :> h &, s];
s];
PrintStructure[x_]:=
PrintStructure[x, "", ""];
PrintStructure[l_List, prefix_, suffix_] :=
Module[{},
If[StringLength[ToString[l] <> prefix] > 50,
Print[prefix, "{"];
Map[PrintStructure[#, " " <> prefix, ","] &, l];
Print[prefix, "}"],
Print[prefix, ToString[l,OutputForm]]]];
PrintStructure[s_, prefix_, suffix_] :=
Print[prefix, s, suffix];
PrintError[err_] :=
Module[{},
If[Head[err] === KrancError,
Module[{},
objs = err[[1]];
stack = err[[2]];
Map[PrintStructure, objs];
(* Print["Error stack:"];
PrintStructure[stack]*)
],
err]];
ThrowError[objects__] :=
Module[{s = Stack[_], s2},
s2 = removeBits[s];
Throw[KrancError[{objects}, s2], KrancError]];
VerifyString[s_] :=
If[! StringQ[s],
ThrowError["Not a string:", s]];
VerifyStringList[l_] :=
If[! MatchQ[l, {___String}],
ThrowError["Not a list of strings:", l]];
VerifyList[l_] :=
If[!Head[l] === List,
ThrowError["Not a list:", l]];
InfoMessage[level_, message__] :=
Module[{args = {message}},
If[level <= debugLevel,
Map[PrintStructure, args]];
];
SetDebugLevel[level_] :=
debugLevel = level;
End[];
EndPackage[];
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