Expression parser is a library of components, that evaluates Pascal like scripts at run time. It is not an interpretator, but is a quasi compiler, so it works fast. It has the following features:user defined functions and aliases;supports: if...then..else...;for...:=... to/downto ... do ; while...do...; repeat...until...;try finally end; try except end; raising exceptions;New! nested and inline comments;class creating, referencing any published property of any class;and more than 800 registered public methods and properties of more than 100 useful Delphi VCL classes;creating and referencing OLE automation objects;links directly in a script to a runtime components, that can be also on a data module;links to any runtime function or class method;calling user defined scripts from the program;executing a script generated script;variables, can be a value, expression, DBField or a link to a runtime var;syntax checking of the scripts, checks also for using a valid variables, functions and arguments;request for used variables, by a given script, that need initialization;on event evaluated functions and variables;supports integer, hex, FP, boolean, date string and variant type constants;design time editors for variables and functions, that can be loaded and saved in INI file;special links of dependences, tracks the changes in related objects;more than 200 build in functions;enhance error handling; New! compile-time and runtime error handling, returning row, column and position of the error;full help and demo;You will feel the Expression parser as a real extention of your favourite compiler at runtime.