package tokenize

import (
	"fmt"
	"runtime"
	"strings"
)

func callerPanic(depth int, f string, args ...interface{}) {
	filepos := callerFilepos(depth + 1)
	m := fmt.Sprintf(f, args...)
	m = strings.Replace(m, "{caller}", filepos, 1)
	panic(m)
}

func callerFilepos(depth int) string {
	// No error handling, because we call this method ourselves with safe depth values.
	_, file, line, _ := runtime.Caller(depth + 1)
	return fmt.Sprintf("%s:%d", file, line)
}