Question

What is the best way to evaluate simple conditional statements like:

"a>b" ?
"x-4<10+y & y>x" ?

Expressions are loaded from external file. Variables are set in application.
Syntax used is not essential. It may be “&” or “and” or any other supported with language/library.

I need to take different action depending on result of evaluation – is it true or false.

Could I use any parser already included with Andorid?

Is there some way to use JS “eval” from browser component?

Is it possible to use sqlite expressions to get true/false result without selecting anything?

Those libraries are implemented in native code. Will it be faster and less battery expensive?

Answer 1

You can use sqlite expressions, eg:

select 10>2 and 1 < 2;

returns 1

You can actually use variables, eg:

select x > y from (select 1 as x, 2 as y)