scireum / parsii

Super fast and simple evaluator for mathematical expressions written in Java

parsii

Super fast and simple evaluator for mathematical expressions written in Java. More background information can be found in this blog post: http://andreas.haufler.info/2013/12/how-to-write-one-of-fastest-expression.html

Using it is as simple as:

Scope scope = Scope.create();   
Variable a = scope.getVariable("a");   
Expression expr = Parser.parse("3 + a * 4", scope);   
a.setValue(4);   
System.out.println(expr.evaluate());   
a.setValue(5);   
System.out.println(expr.evaluate());

For your convenience: A pre-built jar can be found in the build directory.

parsii is part of the open source initiative of scireum GmbH (http://www.scireum.de)
Check out or micro kernel called SIRIUS: https://github.com/scireum/sirius

Maven

parsii is available under https://mvn.scireum.com.

<dependency>
  <groupId>com.scireum</groupId>
  <artifactId>parsii</artifactId>
  <version>...</version>
</dependency>