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diff --git a/libksieve/ksieve/error.h b/libksieve/ksieve/error.h
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+/*  -*- c++ -*-
+    ksieve/error.h
+
+    This file is part of KSieve,
+    the KDE internet mail/usenet news message filtering library.
+    Copyright (c) 2002-2003 Marc Mutz <mutz@kde.org>
+
+    KSieve is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License, version 2, as
+    published by the Free Software Foundation.
+
+    KSieve is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __KSIEVE_ERROR_H__
+#define __KSIEVE_ERROR_H__
+
+#include <qstring.h>
+
+#include <kdepimmacros.h>
+
+#ifdef None // X headers
+#  undef None
+#endif
+
+namespace KSieve {
+
+  class KDE_EXPORT Error {
+  public:
+    enum Type {
+      None = 0,
+      Custom,
+      // parse (well-formedness in XML speak) errors:
+      FirstParseError,
+
+      CRWithoutLF = FirstParseError,
+      SlashWithoutAsterisk,
+      IllegalCharacter,
+      UnexpectedCharacter,
+      NoLeadingDigits,
+      NonCWSAfterTextColon,
+
+      NumberOutOfRange,
+      InvalidUTF8,
+
+      UnfinishedBracketComment,
+      PrematureEndOfMultiLine,
+      PrematureEndOfQuotedString,
+      PrematureEndOfStringList,
+      PrematureEndOfTestList,
+      PrematureEndOfBlock,
+      MissingWhitespace,
+      MissingSemicolonOrBlock,
+
+      ExpectedBlockOrSemicolon,
+      ExpectedCommand,
+      ConsecutiveCommasInStringList,
+      ConsecutiveCommasInTestList,
+      MissingCommaInTestList,
+      MissingCommaInStringList,
+      NonStringInStringList,
+      NonCommandInCommandList,
+      NonTestInTestList,
+      LastParseError = NonTestInTestList,
+      // validity errors:
+      FirstValidityError,
+      RequireNotFirst = FirstValidityError, // rfc3028, 3.2
+      RequireMissingForCommand,
+      RequireMissingForTest,
+      RequireMissingForComparator,
+      UnsupportedCommand,
+      UnsupportedTest,
+      UnsupportedComparator,
+      TestNestingTooDeep,  // site policy
+      BlockNestingTooDeep, // site policy
+      InvalidArgument,
+      ConflictingArguments, // e.g. rfc3028, 2.7.{1,3}
+      ArgumentsRepeated, // similar to ConflictingArguments, e.g. :is :is
+      CommandOrderingConstraintViolation, // e.g. else w/o if, rfc3028, 3.1
+      LastValidityError = CommandOrderingConstraintViolation,
+      // runtime errors:
+      FirstRuntimeError,
+      IncompatibleActionsRequested = FirstRuntimeError,
+      MailLoopDetected,
+      TooManyActions,
+      LastRuntimeError = TooManyActions
+    };
+
+    static const char * typeToString( Type type );
+
+    Error( Type type=None,
+	   const QString & s1=QString::null, const QString & s2=QString::null,
+	   int line=-1, int col=-1 )
+      : mType( type ), mLine( line ), mCol( col ),
+        mStringOne( s1 ), mStringTwo( s2 ) {}
+    Error( Type type, int line, int col )
+      : mType( type ), mLine( line ), mCol( col ) {}
+
+    QString asString() const;
+
+    /** So you can write <pre>if( error() )</pre> with e.g. @ref Lexer */
+    operator bool() const {
+      return type() != None;
+    }
+
+    Type type() const { return mType; }
+    int line() const { return mLine; }
+    int column() const { return mCol; }
+    QString firstString() const { return mStringOne; }
+    QString secondString() const { return mStringTwo; }
+
+  protected:
+    Type mType;
+    int mLine;
+    int mCol;
+    QString mStringOne, mStringTwo;
+  };
+
+} // namespace KSieve
+
+#endif // __KSIEVE_ERROR_H__