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  #ifndef INCLUDED_SLIDESHOW_SMILFUNCTIONPARSER_HXX
  #define INCLUDED_SLIDESHOW_SMILFUNCTIONPARSER_HXX
  
  #include "expressionnode.hxx"
  #include "slideshowexceptions.hxx"
  
  #include <basegfx/range/b2drectangle.hxx>
  
  #include <boost/noncopyable.hpp>
  
  namespace rtl
  {
      class OUString;
  }
  
  /* Definition of SmilFunctionParser class */
  
  namespace slideshow
  {
      namespace internal
      {
          class SmilFunctionParser : private boost::noncopyable
          {
          public:
              /** Parse a string containing a SMIL value.
                  
              	This method parses a string representing
                  a fixed value (i.e. a value that does not
                  change by time). Due to the dynamic view
                  capabilities of the presentation engine,
                  this value can sometimes only be determined
                  during runtime of the animation (because
                  e.g. mixed screen/view coordinates are
                  involved), and is thus still returned as an 
                  ExpressionNode object. An example for 
                  such a case is the "Width+1.0" string, which
                  contains the width of the shape in user 
                  coordinate space, and the screen width
                  in device coordinate space.
  
                  The following grammar is accepted by this method:
                  <code>
                 identifier = 'pi'|'e'|'X'|'Y'|'Width'|'Height'                                                   
                                                                                                                      
                 function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log'
  
                 basic_expression =                                                                                   
                 				 number |                                                                            
                 				 identifier |                                                                        
                 				 function '(' additive_expression ')' |                                              
                 				 '(' additive_expression ')'                                                         
                                                                                                                      
                 unary_expression = 
                 					'-' basic_expression |
                                  basic_expression
                                                                                                                      
                 multiplicative_expression =                                                                          
                 				    unary_expression ( ( '*' unary_expression )* |                           
                                  				   ( '/' unary_expression )* )
                                                                                                                      
                 additive_expression =                                                                                
                 					multiplicative_expression ( ( '+' multiplicative_expression )* |                              
                 											    ( '-' multiplicative_expression )* ) 
  
                  </code> 
  
                  @param rSmilValue
                  The string to parse
  
                  @param rRelativeShapeBounds
                  The bounds of the shape this SMIL value is to be
                  evaluated for. The bounds must be <em>relative</em> to
                  the page the shape is part of, i.e. within the [0,1]
                  range. This is necessary, since the string might
                  contain symbolic references to the shape bounding box.
                  
                  @throws ParseError if an invalid expression is given.
  
                  @return the generated function object.
               */
              static ExpressionNodeSharedPtr parseSmilValue( const ::rtl::OUString& 			rSmilValue,
                                                             const ::basegfx::B2DRectangle&	rRelativeShapeBounds ); // throw ParseError
  
              /** Parse a string containing a SMIL function.
                  
              	This method parses a string representing
                  a possibly time-varying SMIL function.
  
                  The following grammar is accepted by this method:
                  <code>
                 identifier = 't'|'pi'|'e'|'X'|'Y'|'Width'|'Height'                                                   
                                                                                                                      
                 function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log'
  
                 basic_expression =                                                                                   
                 				 number |                                                                            
                 				 identifier |                                                                        
                 				 function '(' additive_expression ')' |                                              
                 				 '(' additive_expression ')'                                                         
                                                                                                                      
                 unary_expression = 
                 					'-' basic_expression |
                                  basic_expression
                                                                                                                      
                 multiplicative_expression =                                                                          
                 				    unary_expression ( ( '*' unary_expression )* |                           
                                  				   ( '/' unary_expression )* )
                                                                                                                      
                 additive_expression =                                                                                
                 					multiplicative_expression ( ( '+' multiplicative_expression )* |                              
                 											    ( '-' multiplicative_expression )* ) 
  
                  </code> 
  
                  @param rSmilFunction
                  The string to parse
  
                  @param rRelativeShapeBounds
                  The bounds of the shape this SMIL value is to be
                  evaluated for. The bounds must be <em>relative</em> to
                  the page the shape is part of, i.e. within the [0,1]
                  range. This is necessary, since the string might
                  contain symbolic references to the shape bounding box.
  
                  @throws ParseError if an invalid expression is given.
  
                  @return the generated function object.
               */
              static ExpressionNodeSharedPtr parseSmilFunction( const ::rtl::OUString& 			rSmilFunction,
                                                                const ::basegfx::B2DRectangle&	rRelativeShapeBounds ); // throw ParseError
  
          private:
              // disabled constructor/destructor, since this is 
              // supposed to be a singleton
              SmilFunctionParser();
          };
      }
  }
  
  #endif /* INCLUDED_SLIDESHOW_SMILFUNCTIONPARSER_HXX */
  