package grammar

import "fmt"

// Location indicates a position in a stream of runes identified by column
// within newline-separated rows.
type Location struct {
	Row, Col int
}

func (l Location) errf(str string, args ...any) LocatedError {
	return LocatedError{l, fmt.Errorf(str, args...)}
}

// Located wraps a value so that it has a Location attached to it.
type Located[T any] struct {
	Location
	Value T
}

// Locate returns a Located instance combining the given values.
func Locate[T any](l Location, v T) Located[T] {
	return Located[T]{l, v}
}

// LocatedError is an error related to a specific point within a stream of
// runes.
type LocatedError Located[error]

func (e LocatedError) Error() string {
	return fmt.Sprintf("%d:%d: %v", e.Row, e.Col, e.Value)
}