// 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 Utils


func BaseName(s string) string {
	// TODO this is not correct for non-ASCII strings!
	i := len(s) - 1;
	for i >= 0 && s[i] != '/' {
		if s[i] > 128 {
			panic("non-ASCII string");
		}
		i--;
	}
	return s[i + 1 : len(s)];
}


func cleanPath(s string) string {
	for i := 0; i < len(s); i++ {
		if s[i] == '/' {
			i++;
			j := i;
			for j < len(s) && s[j] == '/' {
				j++;
			}
			if j > i {  // more then one '/'
				return s[0 : i] + cleanPath(s[j : len(s)]);
			}
		}
	}
	return s;
}


// Reduce sequences of multiple '/'s into a single '/' and
// strip any trailing '/' (may result in the empty string).
func SanitizePath(s string) string {
	s = cleanPath(s);
	if s[len(s)-1] == '/' {  // strip trailing '/'
		s = s[0 : len(s)-1];
	}
	return s;
}


func Contains(s, sub string, pos int) bool {
	end := pos + len(sub);
	return pos >= 0 && end <= len(s) && s[pos : end] == sub;
}


func TrimExt(s, ext string) string {
	i := len(s) - len(ext);
	if i >= 0 && s[i : len(s)] == ext {
		s = s[0 : i];
	}
	return s;
}


func IntToString(x, base int) string {
	x0 := x;
	if x < 0 {
		x = -x;
		if x < 0 {
			panic("smallest int not handled");
		}
	} else if x == 0 {
		return "0";
	}

	// x > 0
	hex := "0123456789ABCDEF";
	var buf [32] byte;
	i := len(buf);
	for x > 0 {
		i--;
		buf[i] = hex[x % base];
		x /= base;
	}

	if x0 < 0 {
		i--;
		buf[i] = '-';
	}

	return string(buf)[i : len(buf)];
}