// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package path implements utility routines for manipulating slash-separated
// paths.
//
// The path package should only be used for paths separated by forward
// slashes, such as the paths in URLs. This package does not deal with
// Windows paths with drive letters or backslashes; to manipulate
// operating system paths, use the path/filepath package.
package runespath

import (
	"github.com/terorie/oddb-go/runes"
)

// Base returns the last element of path.
// Trailing slashes are removed before extracting the last element.
// If the path is empty, Base returns ".".
// If the path consists entirely of slashes, Base returns "/".
func Base(path []rune) []rune {
	if len(path) == 0 {
		return []rune(".")
	}
	// Strip trailing slashes.
	for len(path) > 0 && path[len(path)-1] == '/' {
		path = path[0 : len(path)-1]
	}
	// Find the last element
	if i := runes.LastIndexRune(path, '/'); i >= 0 {
		path = path[i+1:]
	}
	// If empty now, it had only slashes.
	if len(path) == 0 {
		return []rune("/")
	}
	return path
}

// IsAbs reports whether the path is absolute.
func IsAbs(path string) bool {
	return len(path) > 0 && path[0] == '/'
}