Gostr is a evaluator for a mathematical and logical expressions that allows run-time binding of values to variables referenced in the formulas.
This is probably simplest to illustrate in code:
values := make(map[string]interface{})
values["a"] = 5
result := gostr.Evaluate("a * 2", values)
fmt.Println("Result:", result)
#=> Result: 10
result := gostr.Evaluate("a + 3 * 2", values)
fmt.Println("Result:", result)
#=> Result: 11
result := gostr.Evaluate("(a + 3) * 2", values)
fmt.Println("Result:", result)
#=> Result: 16I have added some simple examples. Run example.go to check those.
Math: + - * /
Logic: < > <= >= <> != = AND OR
Functions: ISBLANK LENGTH NOT ROUND