REPL for library at github.com/Knetic/govaluate

goevaluate_repl.go

package main

import (
	"fmt"
	"github.com/Knetic/govaluate"
	"os"
	"bufio"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	parameters := make(map[string]interface{}, 8)
	for {
		fmt.Print("Expression> ")
		expr, err := reader.ReadString('\n')
		if err != nil { panic(err) }
		if expr == "\n" { return }
		expression, err := govaluate.NewEvaluableExpression(expr);
		result, err := expression.Evaluate(parameters)
		if err != nil { panic(err) }
		fmt.Println(result)
		fmt.Print("Save as (Enter for None)> ")
		symbol, err := reader.ReadString('\n')
		if err != nil { panic(err) }
		if symbol == "\n" { continue }
		symbol = symbol[:len(symbol)-1]
		parameters[symbol] = result
	}
}