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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit47d455dd55be855e4cc691c32f687f723d9247ee (patch)
tree52e236aaa2576bdb3840ebede26619692fed6d7d /kpovmodeler/pminsertrulesystem.h
downloadtdegraphics-47d455dd55be855e4cc691c32f687f723d9247ee.tar.gz
tdegraphics-47d455dd55be855e4cc691c32f687f723d9247ee.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+//-*-C++-*-
+/*
+**************************************************************************
+ description
+ --------------------
+ copyright : (C) 2002-2003 by Andreas Zehender
+ email : zehender@kde.org
+**************************************************************************
+
+**************************************************************************
+* *
+* This program is free software; you can redistribute it and/or modify *
+* it under the terms of the GNU General Public License as published by *
+* the Free Software Foundation; either version 2 of the License, or *
+* (at your option) any later version. *
+* *
+**************************************************************************/
+
+#ifndef PMINSERTRULESYSTEM_H
+#define PMINSERTRULESYSTEM_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pmobject.h"
+
+#include <qstringlist.h>
+#include <qptrlist.h>
+#include <qdict.h>
+#include <qdom.h>
+
+class PMInsertRuleSystem;
+class PMPrototypeManager;
+
+/**
+ * Base class for all object categories (class and group)
+ * for the insert rule system
+ */
+class PMRuleCategory
+{
+public:
+ /**
+ * Default constructor
+ */
+ PMRuleCategory( ) { }
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleCategory( ) { }
+ /**
+ * Returns true if the given class types matches the category.
+ */
+ virtual bool matches( const QString& className ) = 0;
+};
+
+/**
+ * Represents a class for the insert rule system
+ */
+class PMRuleClass : public PMRuleCategory
+{
+public:
+ /**
+ * Workaround to tell a created instance which
+ * prototype manager to use.
+ */
+ static PMPrototypeManager* s_pPrototypeManager;
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleClass( QDomElement& e );
+ /** */
+ virtual bool matches( const QString& className );
+private:
+ QString m_className;
+ PMPrototypeManager* m_pPrototypeManager;
+};
+
+/**
+ * Groups together multiple classes or groups to form a new
+ * category for the insert rule system.
+ */
+class PMRuleDefineGroup
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleDefineGroup( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleDefineGroup( );
+ /**
+ * Returns true if the given class types matches the category.
+ */
+ virtual bool matches( const QString& className );
+ /**
+ * Returns the group's name
+ */
+ QString name( ) const { return m_name; }
+private:
+ QPtrList<PMRuleCategory> m_categories;
+ QString m_name;
+};
+
+/**
+ * Represents a group for the insert rule system
+ */
+class PMRuleGroup : public PMRuleCategory
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleGroup( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ bool matches( const QString& className );
+private:
+ PMRuleDefineGroup* m_pGroup;
+};
+
+
+/**
+ * Base class for all nodes for the insert rule system
+ */
+class PMRuleBase
+{
+public:
+ /**
+ * Default constructor.
+ */
+ PMRuleBase( ) { }
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleBase( );
+ /**
+ * Returns the node type.
+ */
+ virtual QString type( ) const = 0;
+ /**
+ * Calls countChildProtected for this node and all child nodes
+ */
+ void countChild( const QString& className, bool afterInsertPoint );
+ /**
+ * Calls resetProtected for this node and all child nodes
+ */
+ void reset( );
+ /**
+ * Returns an iterator to all child nodes
+ */
+ QPtrListIterator<PMRuleBase> childIterator( ) const
+ {
+ return QPtrListIterator<PMRuleBase>( m_children );
+ }
+protected:
+ /**
+ * Reimplement this method if the nodes value depends
+ * on already inserted child objects.
+ */
+ virtual void countChildProtected( const QString&, bool ) { }
+ /**
+ * Reset all cached data (like counted child objects) here.
+ */
+ virtual void resetProtected( ) { }
+
+ /**
+ * Add all child nodes to this list.
+ */
+ QPtrList<PMRuleBase> m_children;
+};
+
+/**
+ * Base class for values used by the rule system
+ */
+class PMRuleValue : public PMRuleBase
+{
+public:
+ /**
+ * Default constructor
+ */
+ PMRuleValue( ) : PMRuleBase( ) { }
+ /**
+ * Returns the node's value as variant.
+ *
+ * Reimplement this method in sub classes.
+ */
+ virtual PMVariant evaluate( const PMObject* o ) = 0;
+};
+
+
+/**
+ * Value node for object properties
+ */
+class PMRuleProperty : public PMRuleValue
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleProperty( QDomElement& e );
+ /** */
+ virtual QString type( ) const { return QString( "Property" ); }
+ /** */
+ virtual PMVariant evaluate( const PMObject* o );
+private:
+ QString m_property;
+};
+
+
+/**
+ * Simple constant
+ */
+class PMRuleConstant : public PMRuleValue
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleConstant( QDomElement& e );
+ /** */
+ virtual QString type( ) const { return QString( "Constant" ); }
+ /** */
+ virtual PMVariant evaluate( const PMObject* );
+ /**
+ * Converts the constant to the given type and returns true if
+ * successful.
+ */
+ bool convertTo( PMVariant::PMVariantDataType type );
+private:
+ PMVariant m_value;
+};
+
+/**
+ * Rule that counts child objects of certaint types
+ */
+class PMRuleCount : public PMRuleValue
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleCount( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleCount( );
+ /** */
+ virtual QString type( ) const { return QString( "Count" ); }
+ /** */
+ virtual PMVariant evaluate( const PMObject* );
+protected:
+ /** */
+ virtual void countChildProtected( const QString& className,
+ bool afterInsertPoint );
+ /**
+ * Reset all cached data (like counted child objects) here.
+ */
+ virtual void resetProtected( );
+private:
+ QPtrList<PMRuleCategory> m_categories;
+ int m_number;
+};
+
+/**
+ * Base class for conditions
+ */
+class PMRuleCondition : public PMRuleBase
+{
+public:
+ /**
+ * Default constructor
+ */
+ PMRuleCondition( ) : PMRuleBase( ) { }
+ /**
+ * Returns the condition's value.
+ *
+ * Reimplement this method in sub classes.
+ */
+ virtual bool evaluate( const PMObject* object ) = 0;
+};
+
+
+/**
+ * Logical negation
+ */
+class PMRuleNot : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleNot( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual QString type( ) const { return QString( "Not" ); }
+ /** */
+ virtual bool evaluate( const PMObject* object );
+private:
+ PMRuleCondition* m_pChild;
+};
+
+
+/**
+ * Logical and
+ */
+class PMRuleAnd : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleAnd( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual QString type( ) const { return QString( "And" ); }
+ /** */
+ virtual bool evaluate( const PMObject* object );
+private:
+ QPtrList<PMRuleCondition> m_conditions;
+};
+
+/**
+ * Logical or
+ */
+class PMRuleOr : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleOr( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual QString type( ) const { return QString( "Or" ); }
+ /** */
+ virtual bool evaluate( const PMObject* object );
+private:
+ QPtrList<PMRuleCondition> m_conditions;
+};
+
+/**
+ * Condition. Value is true if the object already contains
+ * objects of certaint classes before the insert point.
+ */
+class PMRuleBefore : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleBefore( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleBefore( );
+ /** */
+ virtual QString type( ) const { return QString( "Before" ); }
+ /** */
+ virtual bool evaluate( const PMObject* object );
+protected:
+ /** */
+ virtual void countChildProtected( const QString& className,
+ bool afterInsertPoint );
+ /** */
+ virtual void resetProtected( );
+private:
+ QPtrList<PMRuleCategory> m_categories;
+ bool m_contains;
+};
+
+/**
+ * Condition. Value is true if the object already contains
+ * objects of certaint classes after the insert point.
+ */
+class PMRuleAfter : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleAfter( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleAfter( );
+ /** */
+ virtual QString type( ) const { return QString( "After" ); }
+ /** */
+ virtual bool evaluate( const PMObject* object );
+protected:
+ /** */
+ virtual void countChildProtected( const QString& className,
+ bool afterInsertPoint );
+ /** */
+ virtual void resetProtected( );
+private:
+ QPtrList<PMRuleCategory> m_categories;
+ bool m_contains;
+};
+
+/**
+ * Condition. Value is true if the object already contains
+ * objects of certaint classes.
+ */
+class PMRuleContains : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleContains( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /**
+ * Destructor
+ */
+ virtual ~PMRuleContains( );
+ /** */
+ virtual QString type( ) const { return QString( "Contains" ); }
+ /** */
+ virtual bool evaluate( const PMObject* object );
+protected:
+ /** */
+ virtual void countChildProtected( const QString& className,
+ bool afterInsertPoint );
+ /** */
+ virtual void resetProtected( );
+private:
+ QPtrList<PMRuleCategory> m_categories;
+ bool m_contains;
+};
+
+/**
+ * Base class for comparisons
+ */
+class PMRuleCompare : public PMRuleCondition
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleCompare( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual bool evaluate( const PMObject* object );
+protected:
+ /**
+ * Compares the two variants. The variants have the same type.
+ *
+ * Reimplement this method in sub classes.
+ */
+ virtual bool compare( const PMVariant& v1, const PMVariant& v2 ) = 0;
+private:
+ PMRuleValue* m_pValue[2];
+};
+
+/**
+ * Less than comparison
+ */
+class PMRuleLess : public PMRuleCompare
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleLess( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual QString type( ) const { return QString( "Less" ); }
+protected:
+ /** */
+ virtual bool compare( const PMVariant& v1, const PMVariant& v2 );
+};
+
+/**
+ * Greater than comparison
+ */
+class PMRuleGreater : public PMRuleCompare
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleGreater( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual QString type( ) const { return QString( "Greater" ); }
+protected:
+ /** */
+ virtual bool compare( const PMVariant& v1, const PMVariant& v2 );
+};
+
+/**
+ * Equal comparison
+ */
+class PMRuleEqual : public PMRuleCompare
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleEqual( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /** */
+ virtual QString type( ) const { return QString( "Equal" ); }
+protected:
+ /** */
+ virtual bool compare( const PMVariant& v1, const PMVariant& v2 );
+};
+
+class PMRule : public PMRuleBase
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRule( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups,
+ QPtrList<PMRuleDefineGroup>& localGroups );
+ /**
+ * Destructor
+ */
+ virtual ~PMRule( );
+ /** */
+ virtual QString type( ) const { return QString( "Rule" ); }
+ /**
+ * Returns true if this rule matches for the given class.
+ */
+ bool matches( const QString& className );
+ /**
+ * Returns the conditions value.
+ */
+ bool evaluate( const PMObject* parent );
+
+private:
+ QPtrList<PMRuleCategory> m_categories;
+ PMRuleCondition* m_pCondition;
+};
+
+/**
+ * Class used internally by the insert rule system
+ *
+ * Stores all rules for one class.
+ */
+class PMRuleTargetClass
+{
+public:
+ /**
+ * Reads the data from the QDomElement.
+ */
+ PMRuleTargetClass( QDomElement& e,
+ QPtrList<PMRuleDefineGroup>& globalGroups );
+ /**
+ * Destructor
+ */
+ ~PMRuleTargetClass( );
+
+ /**
+ * Reads rules and groups from the QDomELement and appends
+ * them to the local ones.
+ */
+ void appendRules( QDomElement& e, QPtrList<PMRuleDefineGroup>& globalGroups );
+ /**
+ * Returns an iterator to the rules
+ */
+ QPtrListIterator<PMRule> rules( ) const
+ {
+ return QPtrListIterator<PMRule>( m_rules );
+ }
+ /**
+ * Returns the class name
+ */
+ QString name( ) const { return m_class; }
+ /**
+ * Returns a list of exceptions for this rule.
+ */
+ QStringList exceptions( ) const { return m_exceptions; }
+private:
+ QPtrList<PMRuleDefineGroup> m_groups;
+ QPtrList<PMRule> m_rules;
+ QString m_class;
+ QStringList m_exceptions;
+};
+
+/**
+ * Rule based system that checks which objects can be inserted as child
+ * into another object.
+ *
+ * The rules are defined in the file "pmbaseinsertrules.xml".
+ * The file "pminsertrules.dtd" is a DTD file that can be used
+ * to validate rule files.
+ *
+ * Plugins can add additional rules to the system.
+ */
+class PMInsertRuleSystem
+{
+public:
+ /**
+ * Constructor
+ */
+ PMInsertRuleSystem( PMPart* part );
+ /**
+ * Destructor
+ */
+ ~PMInsertRuleSystem( );
+
+ /**
+ * Tells the system to load the rules from a file.
+ *
+ * Rules are never loaded twice for the same file. It is save
+ * to call this method twice for the same file.
+ */
+ void loadRules( const QString& fileName );
+
+ /**
+ * Returns true if an object of the given class can be inserted as child
+ * after the object after.
+ *
+ * The parser uses the third parameter for top level objects. These objects
+ * have to be treated as if they are inserted after the object after.
+ */
+ bool canInsert( const PMObject* parentObject, const QString& className,
+ const PMObject* after, const PMObjectList* objectsBetween = 0 );
+
+ /**
+ * Returns true if the object can be inserted as child
+ * after the object after.
+ *
+ * The parser uses the third parameter for top level objects. These objects
+ * have to be treated as if they are inserted after the object after.
+ *
+ * Same as canInsert( parentObject, object->class( ), after, objectsBetween )
+ */
+ bool canInsert( const PMObject* parentObject, const PMObject* object,
+ const PMObject* after, const PMObjectList* objectsBetween = 0 );
+
+ /**
+ * Returns the number of objects that can be inserted at that position
+ */
+ int canInsert( const PMObject* parentObject, const PMObjectList& list,
+ const PMObject* after );
+ /**
+ * Returns the number of objects that can be inserted at that position
+ */
+ int canInsert( const PMObject* parentObject, const QStringList& listOfClasses,
+ const PMObject* after );
+ /**
+ * Returns a pointer to the part
+ */
+ PMPart* part( ) const { return m_pPart; }
+
+private:
+ /**
+ * List of all rules.
+ */
+ QPtrList<PMRuleTargetClass> m_classRules;
+ /**
+ * List of global groups
+ */
+ QPtrList<PMRuleDefineGroup> m_groups;
+ /**
+ * Dictionary that maps from the class name
+ * to a list of rules that match.
+ */
+ QDict<PMRuleTargetClass> m_rulesDict;
+ /**
+ * List of already loaded files
+ */
+ QStringList m_loadedFiles;
+ PMPart* m_pPart;
+};
+
+#endif