Eval for Swift

Easily evaluate simple expressions on the go...

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

Installation

Just add the repo in Swift Package Manager

Usage

import Eval
        
let config = DoubleEvalConfiguration()

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

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

compiled.setConstant(8, forName: "n")
let result3 = try compiled.execute() as? Double

compiled.setConstant(9, forName: "n")
let result4 = try 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.
• [email protected] 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.