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88 lines
2.2 KiB
ObjectPascal
88 lines
2.2 KiB
ObjectPascal
unit WarnCaseNoElse;
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{ AFS 20 June 2K
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warn of case without a default 'else' case
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This is often an error
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your program will be more error-proof if every case has an else
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if you can't think of anything to put there, put
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case
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...
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else Raise Exception.Create('case had unexpected value');
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end;
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}
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{(*}
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(*------------------------------------------------------------------------------
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Delphi Code formatter source code
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The Original Code is WarnCaseNoElse, released May 2003.
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The Initial Developer of the Original Code is Anthony Steele.
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Portions created by Anthony Steele are Copyright (C) 1999-2008 Anthony Steele.
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All Rights Reserved.
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Contributor(s): Anthony Steele.
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The contents of this file are subject to the Mozilla Public License Version 1.1
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(the "License"). you may not use this file except in compliance with the License.
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You may obtain a copy of the License at http://www.mozilla.org/NPL/
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied.
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See the License for the specific language governing rights and limitations
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under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 2 or later (the "GPL")
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See http://www.gnu.org/licenses/gpl.html
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------------------------------------------------------------------------------*)
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{*)}
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{$I JcfGlobal.inc}
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interface
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uses Warning;
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type
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TWarnCaseNoElse = class(TWarning)
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public
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constructor Create; override;
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procedure PreVisitParseTreeNode(const pcNode: TObject); override;
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end;
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implementation
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uses
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ParseTreeNode, ParseTreeNodeType;
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constructor TWarnCaseNoElse.Create;
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begin
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inherited;
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HasPreVisit := True;
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HasPostVisit := False;
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HasSourceTokenVisit := True;
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end;
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procedure TWarnCaseNoElse.PreVisitParseTreeNode(const pcNode: TObject);
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var
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lcNode: TParseTreeNode;
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begin
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lcNode := TParseTreeNode(pcNode);
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// when we have a case statement, does it have an else?
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if (lcNode.NodeType = nCaseStatement) and
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( not lcNode.HasChildNode(nElseCase, 1)) then
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begin
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SendWarning(lcNode, 'Case statement has no else case');
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end;
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end;
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end.
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