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