42 lines
708 B
Go
42 lines
708 B
Go
package main
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"monkey/internal/lexer"
|
|
"monkey/internal/token"
|
|
"os"
|
|
"os/user"
|
|
)
|
|
|
|
const prompt = ">> "
|
|
|
|
func main() {
|
|
user, err := user.Current()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
fmt.Printf("Hello %s! This is the Monkey programming language!\n",
|
|
user.Username)
|
|
fmt.Printf("Feel free to type in commands\n")
|
|
start(os.Stdin, os.Stdout)
|
|
}
|
|
|
|
func start(in io.Reader, out io.Writer) {
|
|
scanner := bufio.NewScanner(in)
|
|
|
|
for {
|
|
fmt.Fprintf(out, prompt)
|
|
scanned := scanner.Scan()
|
|
if !scanned {
|
|
return
|
|
}
|
|
line := scanner.Text()
|
|
l := lexer.New(line)
|
|
for tok := l.NextToken(); tok.Type != token.EOF; tok = l.NextToken() {
|
|
fmt.Fprintf(out, "%+v\n", tok)
|
|
}
|
|
}
|
|
}
|