1package http
 2
 3import "strings"
 4
 5// JoinPath returns an absolute URL path composed of the two paths provided.
 6// Enforces that the returned path begins with '/'. If added path is empty the
 7// returned path suffix will match the first parameter suffix.
 8func JoinPath(a, b string) string {
 9	if len(a) == 0 {
10		a = "/"
11	} else if a[0] != '/' {
12		a = "/" + a
13	}
14
15	if len(b) != 0 && b[0] == '/' {
16		b = b[1:]
17	}
18
19	if len(b) != 0 && len(a) > 1 && a[len(a)-1] != '/' {
20		a = a + "/"
21	}
22
23	return a + b
24}
25
26// JoinRawQuery returns an absolute raw query expression. Any duplicate '&'
27// will be collapsed to single separator between values.
28func JoinRawQuery(a, b string) string {
29	a = strings.TrimFunc(a, isAmpersand)
30	b = strings.TrimFunc(b, isAmpersand)
31
32	if len(a) == 0 {
33		return b
34	}
35	if len(b) == 0 {
36		return a
37	}
38
39	return a + "&" + b
40}
41
42func isAmpersand(v rune) bool {
43	return v == '&'
44}