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1
2
3
4
5 package present
6
7 import (
8 "fmt"
9 "log"
10 "net/url"
11 "strings"
12 )
13
14 func init() {
15 Register("link", parseLink)
16 }
17
18 type Link struct {
19 Cmd string
20 URL *url.URL
21 Label string
22 }
23
24 func (l Link) PresentCmd() string { return l.Cmd }
25 func (l Link) TemplateName() string { return "link" }
26
27 func parseLink(ctx *Context, fileName string, lineno int, text string) (Elem, error) {
28 args := strings.Fields(text)
29 if len(args) < 2 {
30 return nil, fmt.Errorf("link element must have at least 2 arguments")
31 }
32 url, err := url.Parse(args[1])
33 if err != nil {
34 return nil, err
35 }
36 label := ""
37 if len(args) > 2 {
38 label = strings.Join(args[2:], " ")
39 } else {
40 scheme := url.Scheme + "://"
41 if url.Scheme == "mailto" {
42 scheme = "mailto:"
43 }
44 label = strings.Replace(url.String(), scheme, "", 1)
45 }
46 return Link{text, url, label}, nil
47 }
48
49 func renderLink(href, text string) string {
50 text = font(text)
51 if text == "" {
52 text = href
53 }
54
55 target := "_blank"
56 if u, err := url.Parse(href); err != nil {
57 log.Println("renderLink parsing url:", err)
58 } else if !u.IsAbs() || u.Scheme == "javascript" {
59 target = "_self"
60 }
61
62 return fmt.Sprintf(`<a href="%s" target="%s">%s</a>`, href, target, text)
63 }
64
65
66
67
68 func parseInlineLink(s string) (link string, length int) {
69 if !strings.HasPrefix(s, "[[") {
70 return
71 }
72 end := strings.Index(s, "]]")
73 if end == -1 {
74 return
75 }
76 urlEnd := strings.Index(s, "]")
77 rawURL := s[2:urlEnd]
78 const badURLChars = `<>"{}|\^[] ` + "`"
79 if strings.ContainsAny(rawURL, badURLChars) {
80 return
81 }
82 if urlEnd == end {
83 simpleURL := ""
84 url, err := url.Parse(rawURL)
85 if err == nil {
86
87
88
89 if strings.HasPrefix(rawURL, url.Scheme+"://") {
90 simpleURL = strings.TrimPrefix(rawURL, url.Scheme+"://")
91 } else if strings.HasPrefix(rawURL, url.Scheme+":") {
92 simpleURL = strings.TrimPrefix(rawURL, url.Scheme+":")
93 }
94 }
95 return renderLink(rawURL, simpleURL), end + 2
96 }
97 if s[urlEnd:urlEnd+2] != "][" {
98 return
99 }
100 text := s[urlEnd+2 : end]
101 return renderLink(rawURL, text), end + 2
102 }
103
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