Source: ktraderparsetree.h

# Source: ktraderparsetree.h |
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    /* This file is part of the KDE project
       Copyright (C) 1998, 1999 Torben Weis

       This library is free software; you can redistribute it and/or
       modify it under the terms of the GNU Library General Public
       License as published by the Free Software Foundation; either
       version 2 of the License, or (at your option) any later version.

       This library 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
       Library General Public License for more details.

       You should have received a copy of the GNU Library General Public License
       along with this library; see the file COPYING.LIB.  If not, write to
       the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
       Boston, MA 02111-1307, USA.
    */

    #ifndef __parse_tree_h__
    #define __parse_tree_h__

    #include
    #include
    #include
    #include
    #include

    #include
    #include

    #include "ktrader.h"

    namespace KIO {

    class ParseTreeBase;

    struct PreferencesReturn
    {
      enum Type { PRT_DOUBLE, PRT_ERROR };

      PreferencesReturn() { type = PRT_ERROR; }

      PreferencesReturn( const PreferencesReturn& _r )
      {
        type = _r.type;
        f = _r.f;
      }

      Type type;
      double f;
    };

    /**
     * @return 0  => Does not match
     *         1  => Does match
     *         <0 => Error
     */
    int matchConstraint( const ParseTreeBase *_tree, const KService::Ptr &,
    		     const KServiceTypeProfile::OfferList& );

    /**
     * @return 1 on success or <0 on Error
     */
    PreferencesReturn matchPreferences( const ParseTreeBase *_tree, const KService::Ptr &,
    				    const KServiceTypeProfile::OfferList& );

    /**
     * @internal
     */
    struct PreferencesMaxima
    {
      enum Type { PM_ERROR, PM_INVALID_INT, PM_INVALID_DOUBLE, PM_DOUBLE, PM_INT };

      Type type;
      int iMax;
      int iMin;
      double fMax;
      double fMin;
    };

    /**
     * @internal
     */
    class ParseContext
    {
    public:
      /**
       * This is NOT a copy constructor.
       */
      ParseContext( const ParseContext* _ctx ) : service( _ctx->service ), maxima( _ctx->maxima ),
        offers( _ctx->offers ) {}
      ParseContext( const KService::Ptr & _service, const KServiceTypeProfile::OfferList& _offers,
    		QMap& _m )
        : service( _service ), maxima( _m ), offers( _offers ) {}

      bool initMaxima( const QString& _prop);

      enum Type { T_STRING = 1, T_DOUBLE = 2, T_NUM = 3, T_BOOL = 4,
    	      T_STR_SEQ = 5, T_SEQ = 6 };

      QString str;
      int i;
      double f;
      bool b;
      QValueList seq;
      QStringList strSeq;
      Type type;

      KService::Ptr service;

      QMap& maxima;
      const KServiceTypeProfile::OfferList& offers;
    };

    /**
     * @internal
     */
    class ParseTreeBase : public KShared
    {
    public:
      typedef KSharedPtr Ptr;
      ParseTreeBase() { }

      virtual bool eval( ParseContext *_context ) const = 0;
    protected:
      virtual ~ParseTreeBase() { };
    };

    ParseTreeBase::Ptr parseConstraints( const QString& _constr );
    ParseTreeBase::Ptr parsePreferences( const QString& _prefs );

    /**
     * @internal
     */
    class ParseTreeOR : public ParseTreeBase
    {
    public:
      ParseTreeOR( ParseTreeBase *_ptr1, ParseTreeBase *_ptr2 ) { m_pLeft = _ptr1; m_pRight = _ptr2; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
      ParseTreeBase::Ptr m_pRight;
    };

    /**
     * @internal
     */
    class ParseTreeAND : public ParseTreeBase
    {
    public:
      ParseTreeAND( ParseTreeBase *_ptr1, ParseTreeBase *_ptr2 ) { m_pLeft = _ptr1; m_pRight = _ptr2; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
      ParseTreeBase::Ptr m_pRight;
    };

    /**
     * @internal
     */
    class ParseTreeCMP : public ParseTreeBase
    {
    public:
      ParseTreeCMP( ParseTreeBase *_ptr1, ParseTreeBase *_ptr2, int _i ) { m_pLeft = _ptr1; m_pRight = _ptr2; m_cmd = _i; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
      ParseTreeBase::Ptr m_pRight;
      int m_cmd;
    };

    /**
     * @internal
     */
    class ParseTreeIN : public ParseTreeBase
    {
    public:
      ParseTreeIN( ParseTreeBase *_ptr1, ParseTreeBase *_ptr2 ) { m_pLeft = _ptr1; m_pRight = _ptr2; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
      ParseTreeBase::Ptr m_pRight;
    };

    /**
     * @internal
     */
    class ParseTreeMATCH : public ParseTreeBase
    {
    public:
      ParseTreeMATCH( ParseTreeBase *_ptr1, ParseTreeBase *_ptr2 ) { m_pLeft = _ptr1; m_pRight = _ptr2; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
      ParseTreeBase::Ptr m_pRight;
    };

    /**
     * @internal
     */
    class ParseTreeCALC : public ParseTreeBase
    {
    public:
      ParseTreeCALC( ParseTreeBase *_ptr1, ParseTreeBase *_ptr2, int _i ) { m_pLeft = _ptr1; m_pRight = _ptr2; m_cmd = _i; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
      ParseTreeBase::Ptr m_pRight;
      int m_cmd;
    };

    /**
     * @internal
     */
    class ParseTreeBRACKETS : public ParseTreeBase
    {
    public:
      ParseTreeBRACKETS( ParseTreeBase *_ptr ) { m_pLeft = _ptr; }

      bool eval( ParseContext *_context ) const { return m_pLeft->eval( _context ); }

    protected:
      ParseTreeBase::Ptr m_pLeft;
    };

    /**
     * @internal
     */
    class ParseTreeNOT : public ParseTreeBase
    {
    public:
      ParseTreeNOT( ParseTreeBase *_ptr ) { m_pLeft = _ptr; }

      bool eval( ParseContext *_context ) const;

    protected:
      ParseTreeBase::Ptr m_pLeft;
    };

    /**
     * @internal
     */
    class ParseTreeEXIST : public ParseTreeBase
    {
    public:
      ParseTreeEXIST( const char *_id ) { m_id = _id; }

      bool eval( ParseContext *_context ) const;

    protected:
      QString m_id;
    };

    /**
     * @internal
     */
    class ParseTreeID : public ParseTreeBase
    {
    public:
      ParseTreeID( const char *arg ) { m_str = arg; }

      bool eval( ParseContext *_context ) const;

    protected:
      QString m_str;
    };

    /**
     * @internal
     */
    class ParseTreeSTRING : public ParseTreeBase
    {
    public:
      ParseTreeSTRING( const char *arg ) { m_str = arg; }

      bool eval( ParseContext *_context ) const { _context->type = ParseContext::T_STRING; _context->str = m_str; return true; }

    protected:
      QString m_str;
    };

    /**
     * @internal
     */
    class ParseTreeNUM : public ParseTreeBase
    {
    public:
      ParseTreeNUM( int arg ) { m_int = arg; }

      bool eval( ParseContext *_context ) const { _context->type = ParseContext::T_NUM; _context->i = m_int; return true; }

    protected:
      int m_int;
    };

    /**
     * @internal
     */
    class ParseTreeDOUBLE : public ParseTreeBase
    {
    public:
      ParseTreeDOUBLE( double arg ) { m_double = arg; }

      bool eval( ParseContext *_context ) const { _context->type = ParseContext::T_DOUBLE; _context->f = m_double; return true; }

    protected:
      double m_double;
    };

    /**
     * @internal
     */
    class ParseTreeBOOL : public ParseTreeBase
    {
    public:
      ParseTreeBOOL( bool arg ) { m_bool = arg; }

      bool eval( ParseContext *_context ) const { _context->type = ParseContext::T_BOOL; _context->b = m_bool; return true; }

    protected:
      bool m_bool;
    };

    /**
     * @internal
     */
    class ParseTreeMAX2 : public ParseTreeBase
    {
    public:
      ParseTreeMAX2( const char *_id ) { m_strId = _id; }

      bool eval( ParseContext *_context ) const;

    protected:
      QString m_strId;
    };

    /**
     * @internal
     */
    class ParseTreeMIN2 : public ParseTreeBase
    {
    public:
      ParseTreeMIN2( const char *_id ) { m_strId = _id; }

      bool eval( ParseContext *_context ) const;

    protected:
      QString m_strId;
    };

    }

    #endif

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