mirror of
https://github.com/golang/go
synced 2024-11-18 13:34:41 -07:00
987877771e
Fixes golang/go#20605 Change-Id: Ia87097741b743d9b138f0f16540d601b9525c7de Reviewed-on: https://go-review.googlesource.com/45110 Reviewed-by: Andrew Gerrand <adg@golang.org>
101 lines
2.5 KiB
Go
101 lines
2.5 KiB
Go
// Copyright 2012 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 present
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"net/url"
|
|
"strings"
|
|
)
|
|
|
|
func init() {
|
|
Register("link", parseLink)
|
|
}
|
|
|
|
type Link struct {
|
|
URL *url.URL
|
|
Label string
|
|
}
|
|
|
|
func (l Link) TemplateName() string { return "link" }
|
|
|
|
func parseLink(ctx *Context, fileName string, lineno int, text string) (Elem, error) {
|
|
args := strings.Fields(text)
|
|
if len(args) < 2 {
|
|
return nil, fmt.Errorf("link element must have at least 2 arguments")
|
|
}
|
|
url, err := url.Parse(args[1])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
label := ""
|
|
if len(args) > 2 {
|
|
label = strings.Join(args[2:], " ")
|
|
} else {
|
|
scheme := url.Scheme + "://"
|
|
if url.Scheme == "mailto" {
|
|
scheme = "mailto:"
|
|
}
|
|
label = strings.Replace(url.String(), scheme, "", 1)
|
|
}
|
|
return Link{url, label}, nil
|
|
}
|
|
|
|
func renderLink(href, text string) string {
|
|
text = font(text)
|
|
if text == "" {
|
|
text = href
|
|
}
|
|
// Open links in new window only when their url is absolute.
|
|
target := "_blank"
|
|
if u, err := url.Parse(href); err != nil {
|
|
log.Println("renderLink parsing url:", err)
|
|
} else if !u.IsAbs() || u.Scheme == "javascript" {
|
|
target = "_self"
|
|
}
|
|
|
|
return fmt.Sprintf(`<a href="%s" target="%s">%s</a>`, href, target, text)
|
|
}
|
|
|
|
// parseInlineLink parses an inline link at the start of s, and returns
|
|
// a rendered HTML link and the total length of the raw inline link.
|
|
// If no inline link is present, it returns all zeroes.
|
|
func parseInlineLink(s string) (link string, length int) {
|
|
if !strings.HasPrefix(s, "[[") {
|
|
return
|
|
}
|
|
end := strings.Index(s, "]]")
|
|
if end == -1 {
|
|
return
|
|
}
|
|
urlEnd := strings.Index(s, "]")
|
|
rawURL := s[2:urlEnd]
|
|
const badURLChars = `<>"{}|\^[] ` + "`" // per RFC2396 section 2.4.3
|
|
if strings.ContainsAny(rawURL, badURLChars) {
|
|
return
|
|
}
|
|
if urlEnd == end {
|
|
simpleUrl := ""
|
|
url, err := url.Parse(rawURL)
|
|
if err == nil {
|
|
// If the URL is http://foo.com, drop the http://
|
|
// In other words, render [[http://golang.org]] as:
|
|
// <a href="http://golang.org">golang.org</a>
|
|
if strings.HasPrefix(rawURL, url.Scheme+"://") {
|
|
simpleUrl = strings.TrimPrefix(rawURL, url.Scheme+"://")
|
|
} else if strings.HasPrefix(rawURL, url.Scheme+":") {
|
|
simpleUrl = strings.TrimPrefix(rawURL, url.Scheme+":")
|
|
}
|
|
}
|
|
return renderLink(rawURL, simpleUrl), end + 2
|
|
}
|
|
if s[urlEnd:urlEnd+2] != "][" {
|
|
return
|
|
}
|
|
text := s[urlEnd+2 : end]
|
|
return renderLink(rawURL, text), end + 2
|
|
}
|