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Macro Substitution

Posted on 1997-05-30
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Last Modified: 2012-05-04
How can I pass function names into a variable then
execute the variable.  Here's a Foxpro example of what
I need to do:
Function test;
cval='test'
&cval  -- This line executes the fuction test.
I'm storing serveral different function names within a database
field.  I need to pass the function into a delphi variable and
have the function processed.  Some of the values passed in
may look like this
  function1(abc) AND function2(xyz,123)
I would place it in a variable such as:
cval = 'function1(abc) AND function2(xyz,123)'
then execute the line like so:
if &cval then........
This is how it works in Fox.  If Delphi cannot support
syntax similar to Fox, perhaps there is a component that
I can store the information into a property and the
component executes that macro property.
Component DDEclientconv is close but isn't what I'm
looking for.    I could really use some help.   Thank you.
  -Paul      pwatnes@ix.netcom.com




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Accepted Solution

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arnoldu earned 400 total points
ID: 1336692
I think we have solved the problem you describe. What we actually did is we wrote a parser for evaluating any formular expression using the pascal version of lex / yacc, generated some routines to add access to variables and built up a unit which does nearly anything an expression can contain and which is easily expandable. If you accept this for an answer I can send you the source code in pascal and the lex- and yaccstuff.

//Arnold
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