Eval for Kotlin

Easily evaluate simple expressions on the go...

This is a port of the BigEval.js/Eval.net/SwiftEval library

Features:

Evaluate basic math operators (5 * (4 / 3))
Use constants (x * 27 / 4)
Support for pre-defined function calls (30 * pow(24, 6) / cos(20))
Support for custom function calls
Support for logic operators (26 * 3 < 100 - returns a bool value)
Support for bitwise operators ((1 << 2) == 4)
Support for string values ("test" + 5 == "test5")
Customize the type that is used for numeric values in the expression.
Customize the code behind the execution of any of the operators.
Support for compiling an expression and running multiple times while supplying different constants

Dependency

	dependencies {
    	compile 'com.github.danielgindi:eval:1.0.9'
	}

Usage

import com.dg.eval
import com.dg.eval.configuration

val config = DoubleEvalConfiguration()

val result1 = Evaluator.execute("12+45*10", config) as? Double
val result2 = Evaluator.execute("30 * pow(24, 6) / cos(20)", config) as? Double

val compiled = Evaluator.compile("5 * n", config.clone())

compiled.setConstant("n", 8)
val result3 = compiled.execute() as? Double

compiled.setConstant("n", 9)
val result4 = compiled.execute() as? Double

Operators

The operators currently supported in order of precedence are -

[
    ['!'],  // Factorial
    ['**'],  // power
    ['/', '*', '%'],
    ['+', '-'],
    ['<<', '>>'],  // bit shifts
    ['<', '<=', '>', '>='],
    ['==', '=', '!='],   // equality comparisons
    ['&'], ['^'], ['|'],   // bitwise operations
    ['&&'], ['||']   // logical operations
]

Me

Hi! I am Daniel.
danielgindi@gmail.com is my email address.
That's all you need to know.

Help

If you want to buy me a beer, you are very welcome to Thanks :-)

License

This library is under the Apache License 2.0.

This library is free and can be used in commercial applications without royalty.