45 lines
682 B
Go
45 lines
682 B
Go
|
// +build !change
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"strconv"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
const exitCommand = "bye"
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
e := NewEvaluator()
|
||
|
|
|
||
|
|
fmt.Printf("Welcome to Forth evaluator! To exit type %q.\n", exitCommand)
|
||
|
|
scanner := bufio.NewScanner(os.Stdin)
|
||
|
|
for {
|
||
|
|
fmt.Print(">")
|
||
|
|
scanner.Scan()
|
||
|
|
|
||
|
|
text := scanner.Text()
|
||
|
|
if text == exitCommand {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
stack, err := e.Process(text)
|
||
|
|
if err != nil {
|
||
|
|
fmt.Printf("Evaluation error: %s\n", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
printStack(stack)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func printStack(stack []int) {
|
||
|
|
s := make([]string, 0, len(stack))
|
||
|
|
for _, n := range stack {
|
||
|
|
s = append(s, strconv.Itoa(n))
|
||
|
|
}
|
||
|
|
fmt.Printf("Stack: %s\n", strings.Join(s, ", "))
|
||
|
|
}
|