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I'm looking for an expression language that I can use in both Java and .NET projects. My project uses a java server and a C# UI, and we want to be able to create simple expressions that can be both parsed and executed in both languages.

It needs to have the following features:

  • Basic arithmetic: */+-
  • Variables and Literals
  • Boolean operators: AND, OR, NOT
  • Set membership functions (IN)
  • Complex Expressions e.g. (A+5 > X OR !B) AND Pow(C, 2) < 100
  • Parses into an AST
  • lightweight language specific for single line expressions (i.e. not Python, JavaScript etc.)

Nice to have would be:

  • General Set functions: Union/Intersection/Complement
  • Math/Trig functions
  • User defined functions (defined in Java or C#)
  • Array and Map support

I need the AST so that I can 1) translate the expressions into another language (SQL) and 2) display the expression tree graphically.

The closest I have found is Spring EL (http://www.springframework.net/doc-latest/reference/html/expressions.html, http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/expressions.html), but its unclear to me if the Java and .NET versions are compatible.

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