Is there a way to convert a String to evaluable SAIL expression ? I

Raj Yadla over 9 years ago

Is there a way to convert a String to evaluable SAIL expression ?

I have a comparative expression saved in a database field, I need to retrieve it from the database and evaluate it within a condition in SAIL.

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jackm829 over 9 years ago +1
A Score Level 3

You could try eval(). My understanding is that this is an undocumented function. You will have to test to make sure that it works with your Appian version. Example: eval("count({1,2,3})") returns 3. In…
Raj Yadla over 9 years ago +1

Thanks all ,eval() did the trick for me.

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0 Mike Schmitt
Certified Lead Developer
over 9 years ago

Per what others have said - if it absolutely has to be done this way, other than designing some new plugin to interpret the text commands, all I can think of personally would be to break up the text expressions into separate pieces and evaluate them via conditional statements (which would be difficult). You'd have to have a well-defined business rule regarding what format the expressions could have (i.e. the operators they could handle, the length, etc), but the plus side is that the evaluation rule could always be expanded in the future to handle more things.
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0 Mike Schmitt
Certified Lead Developer
over 9 years ago

Per what others have said - if it absolutely has to be done this way, other than designing some new plugin to interpret the text commands, all I can think of personally would be to break up the text expressions into separate pieces and evaluate them via conditional statements (which would be difficult). You'd have to have a well-defined business rule regarding what format the expressions could have (i.e. the operators they could handle, the length, etc), but the plus side is that the evaluation rule could always be expanded in the future to handle more things.
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