package parsekit

import (
	"fmt"
)

// Error is used as the error type when parsing errors occur.
// The error includes some context information to allow for useful
// error messages to the user.
type Error struct {
	Message string
	Cursor  Cursor
}

func (err *Error) Error() string {
	if err == nil {
		_, linepos := getCaller(1)
		panic(fmt.Sprintf("parsekit.Error.Error(): method called with nil error at %s", linepos))
	}
	return err.Message
}

// Full returns the current error message, including information about
// the position in the input where the error occurred.
func (err *Error) Full() string {
	if err == nil {
		_, linepos := getCaller(1)
		panic(fmt.Sprintf("parsekit.Error.Full(): method called with nil error at %s", linepos))
	}
	return fmt.Sprintf("%s at %s", err, err.Cursor)
}