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Add auto links: Try to render unmarked urls as links

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This commit is contained in:
Niklas Fasching 2018-12-02 18:24:51 +01:00
parent a570fc736f
commit d2d9dc0fc8
4 changed files with 37 additions and 3 deletions
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34
org/inline.go
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@ -24,8 +24,12 @@ type RegularLink struct {
Protocol string
Description []Node
URL string
AutoLink bool
}
var validURLCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;="
var autolinkProtocols = regexp.MustCompile(`(https?|ftp|file)`)
var redundantSpaces = regexp.MustCompile("[ \t]+")
var subScriptSuperScriptRegexp = regexp.MustCompile(`([_^])\{(.*?)\}`)
var footnoteRegexp = regexp.MustCompile(`\[fn:([\w-]+?)(:(.*?))?\]`)
@ -33,7 +37,7 @@ var footnoteRegexp = regexp.MustCompile(`\[fn:([\w-]+?)(:(.*?))?\]`)
func (d *Document) parseInline(input string) (nodes []Node) {
previous, current := 0, 0
for current < len(input) {
consumed, node := 0, (Node)(nil)
rewind, consumed, node := 0, 0, (Node)(nil)
switch input[current] {
case '^':
consumed, node = d.parseSubOrSuperScript(input, current)
@ -45,6 +49,9 @@ func (d *Document) parseInline(input string) (nodes []Node) {
consumed, node = d.parseRegularLinkOrFootnoteReference(input, current)
case '\\':
consumed, node = d.parseExplicitLineBreak(input, current)
case ':':
rewind, consumed, node = d.parseAutoLink(input, current)
current -= rewind
}
if consumed != 0 {
if current > previous {
@ -125,6 +132,29 @@ func (d *Document) parseFootnoteReference(input string, start int) (int, Node) {
return 0, nil
}
func (d *Document) parseAutoLink(input string, start int) (int, int, Node) {
if len(input[start:]) < 3 || input[start+1] != '/' || input[start+2] != '/' {
return 0, 0, nil
}
protocolStart, protocol := start-1, ""
for ; protocolStart > 0 && unicode.IsLetter(rune(input[protocolStart])); protocolStart-- {
}
if m := autolinkProtocols.FindStringSubmatch(input[protocolStart:start]); m != nil {
protocol = m[1]
} else {
return 0, 0, nil
}
end := start
for ; end < len(input) && strings.ContainsRune(validURLCharacters, rune(input[end])); end++ {
}
path := input[start:end]
if path == "://" {
return 0, 0, nil
}
link := RegularLink{protocol, []Node{Text{protocol + path}}, protocol + path, true}
return len(protocol), len(path + protocol), link
}
func (d *Document) parseRegularLink(input string, start int) (int, Node) {
if len(input[start:]) == 0 || input[start+1] != '[' {
return 0, nil
@ -147,7 +177,7 @@ func (d *Document) parseRegularLink(input string, start int) (int, Node) {
if len(parts) == 2 {
protocol = parts[0]
}
return consumed, RegularLink{protocol, description, link}
return consumed, RegularLink{protocol, description, link, false}
}
func (d *Document) parseEmphasis(input string, start int) (int, Node) {