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Eval library - Manuals



Function parser with user interface for design functions and conditions specified at runtime. Converts mathematical, string, date, goniometric, financial functions given as a string (y='sin(x)*sqrt(x+5)') and its argumets into the function value. Run-time database filters, end user friendly inteface.
Basic component is completed with more visual components. End user interface can have user friendly input of expressions and conditions, so, that final user doesn't have to know syntax of individual functions. There is a component to disposition too, which enables simple registry created expressions and conditions and their again exploitation without necessary again putting information's.

Supported functions

Advantages :
  • about 200 supported functions
  • extended functions:
    • Find text with errors
    • Extended goniometric functions
    • More functions working with date & time
  • runtime specified expressions
  • runtime specified calculated fields
  • more flexible than standard TTable.Filter or SQL clause where
  • nice user interface
  • composite functions
Disadvantage: Because Eval library is interpreter, execution time is 8-10x longer than compiled code. But for end user interface, calculators, grids this is very fast.

News...



   30.07.2006
Forums enabled.  

   20.07.2006
TBarcodeReaderW component for Delphi, read barcode from serial port added  

   15.07.2006
Added new page  

 03.07.2006
Version 5.1, updated. Support for Delphi 2006™, added 2 new components.  

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