func DetectImage(s *Context) (consumed int) {
rest := s.Buf[s.Pos:]
if !bytes.HasPrefix(rest, []byte(`![`)) {
return 0
}
m := reImageTagStarter.FindSubmatch(rest)
if m == nil {
return 2
}
altText, residual := m[1], m[3]
// e.g.: "] [ref id]" ?
r := reImageRef.FindSubmatch(residual)
if r != nil {
tag := rest[:len(rest)-len(residual)+len(r[0])]
refID := mdutils.Simplify(r[1])
// NOTE(akavel): below refID resolution seems not in spec, but expected according to testdata/test/span_level/image{/expected,}/link_text_with_newline.* and makes sense to me as such.
// TODO(akavel): send fix for this to the spec
if refID == "" {
refID = mdutils.Simplify(altText)
}
s.Emit(tag, md.Image{
AltText: mdutils.DeEscape(string(altText)),
ReferenceID: refID,
RawEnd: md.Raw{
md.Run{-1, r[0]},
},
}, true)
return len(tag)
}
// e.g.: "] ("...
consumed = imageParen(s, altText, len(rest)-len(residual), residual)
if consumed > 0 {
return consumed
}
// "neither of the above conditions"
closing := residual[:1]
r = reImageEmptyRef.FindSubmatch(residual)
if r != nil {
closing = r[0]
}
tag := rest[:len(rest)-len(residual)+len(closing)]
s.Emit(tag, md.Image{
ReferenceID: mdutils.Simplify(altText),
AltText: mdutils.DeEscape(string(altText)),
RawEnd: md.Raw{
md.Run{-1, closing},
},
}, true)
return len(tag)
}
func imageParen(s *Context, altText []byte, prefix int, residual []byte) (consumed int) {
// fmt.Println("imageParen @", s.Pos, string(s.Buf[s.Pos:s.Pos+prefix]))
// e.g.: "] ("
if !reImageParen.Match(residual) {
// fmt.Println("no ](")
return 0
}
// fmt.Println("yes ](")
r := reImageURLWithoutAngle.FindSubmatch(residual)
if r == nil {
r = reImageURLWithAngle.FindSubmatch(residual)
}
if r == nil {
// fmt.Println("no imgurl")
return 0
}
// fmt.Println("yes imgurl")
unprocessedSrc, attrs := r[1], r[2]
a := reImageAttrParen.FindSubmatch(attrs)
if a == nil {
a = reImageAttrTitle.FindSubmatch(attrs)
}
if a == nil {
// fmt.Println("no imgattr")
return 0
}
// fmt.Println("yes imgattr")
title := ""
if len(a) >= 2 {
unprocessedTitle := a[1][1 : len(a[1])-1]
title = strings.Replace(string(unprocessedTitle), "\x0a", "", -1)
}
rest := s.Buf[s.Pos:]
tag := rest[:prefix+(len(residual)-len(attrs))+len(a[0])]
s.Emit(tag, md.Image{
// TODO(akavel): keep only raw slices as fields, add methods to return processed strings
URL: mdutils.DelWhites(string(unprocessedSrc)),
Title: mdutils.DeEscape(title),
AltText: mdutils.DeEscape(string(altText)),
RawEnd: md.Raw{
md.Run{-1, tag[prefix:]},
},
}, true)
return len(tag)
}
func closingLinkTag(s *Context) (consumed int) {
// TODO(akavel): refactor to use s.PopTo (or not, for efficiency?)
if s.Openings.NullTopmostTagged("[") {
return 1 // consume the ']'
}
rest := s.Buf[s.Pos:]
// e.g.: "] [ref id]" ?
m := reClosingTagRef.FindSubmatch(rest)
if m != nil {
// cancel all unclosed spans inside the link
for s.Openings.Peek().Tag != "[" {
s.Openings.Pop()
}
// emit a link
opening := s.Openings.Peek()
s.Emit(s.Buf[opening.Pos:][:len(opening.Tag)], md.Link{
ReferenceID: mdutils.Simplify(m[1]),
RawEnd: md.Raw{
md.Run{-1, m[0]},
},
}, false)
s.Emit(m[0], md.End{}, false)
s.Openings.Pop()
// cancel all unclosed links
s.Openings.deleteLinks()
return len(m[0])
}
// e.g.: "] (http://www.example.net"... ?
m = reClosingTagWithoutAngle.FindSubmatch(rest)
if m == nil {
// e.g.: "] ( <http://example.net/?q=)>"... ?
m = reClosingTagWithAngle.FindSubmatch(rest)
}
if m != nil {
linkURL := mdutils.DelWhites(string(m[1]))
residual := m[2]
title := ""
t := reJustClosingParen.FindSubmatch(residual)
if t == nil {
t = reTitleAndClosingParen.FindSubmatch(residual)
}
if t != nil {
if len(t) > 1 {
attribs := t[1]
unquoted := attribs[1 : len(attribs)-1]
title = strings.Replace(string(unquoted), "\u000a", "", -1)
}
// cancel all unclosed spans inside the link
for s.Openings.Peek().Tag != "[" {
s.Openings.Pop()
}
// emit a link
opening := s.Openings.Peek()
closing := rest[:len(rest)-len(residual)+len(t[0])]
s.Emit(s.Buf[opening.Pos:][:len(opening.Tag)], md.Link{
URL: linkURL,
Title: mdutils.DeEscape(title),
RawEnd: md.Raw{
md.Run{-1, closing},
},
}, false)
s.Emit(closing, md.End{}, false)
s.Openings.Pop()
// cancel all unclosed links
s.Openings.deleteLinks()
return len(closing)
}
}
// e.g.: "] []" ?
m = reEmptyRef.FindSubmatch(rest)
if m == nil {
// just: "]"
m = [][]byte{rest[:1]}
}
// cancel all unclosed spans inside the link
for s.Openings.Peek().Tag != "[" {
s.Openings.Pop()
}
// emit a link
begin := s.Openings.Peek()
s.Emit(s.Buf[begin.Pos:][:len(begin.Tag)], md.Link{
ReferenceID: mdutils.Simplify(s.Buf[begin.Pos+len(begin.Tag) : s.Pos]),
RawEnd: md.Raw{
md.Run{-1, m[0]},
},
}, false)
s.Emit(m[0], md.End{}, false)
s.Openings.Pop()
// cancel all unclosed links
s.Openings.deleteLinks()
return len(m[0])
}
func DetectReferenceResolution(start, second Line, detectors Detectors) Handler {
if start.hasFourSpacePrefix() {
return nil
}
m := reRefResolution1.FindSubmatch(bytes.TrimRight(start.Bytes, "\n"))
if len(m) == 0 {
return nil
}
b := md.ReferenceResolutionBlock{}
unprocessedReferenceID := m[1]
b.ReferenceID = mdutils.Simplify(unprocessedReferenceID)
refValueSequence := m[9] // TODO(akavel): verify if right one
m = reRefResolution2.FindSubmatch(refValueSequence)
if len(m) == 0 {
return nil
}
unprocessedURL := m[1]
{
tmp := make([]byte, 0, len(unprocessedURL))
for _, c := range unprocessedURL {
if c != ' ' && c != '<' && c != '>' {
tmp = append(tmp, c)
}
}
b.URL = string(tmp)
}
refDefinitionTrailingSequence := m[2]
// Detected ok. Now check if 1 or 2 lines.
var nlines int
titleContainer := ""
if bytes.IndexAny(refDefinitionTrailingSequence, " ") == -1 &&
!second.EOF() &&
reRefResolution3.Match(bytes.TrimRight(second.Bytes, "\n")) {
nlines = 2
titleContainer = string(bytes.TrimRight(second.Bytes, "\n"))
} else {
nlines = 1
titleContainer = string(refDefinitionTrailingSequence)
}
// NOTE(akavel): below line seems not in the spec, but seems necessary (refDefinitionTrailingSequence always starts with space IIUC).
titleContainer = strings.TrimLeft(titleContainer, " ")
if m := reRefResolution4.FindStringSubmatch(titleContainer); len(m) != 0 {
b.Title = mdutils.DeEscape(m[1])
}
if s := hasQuotedStringPrefix(titleContainer); s != "" {
b.Title = mdutils.DeEscape(s[1 : len(s)-1])
}
return HandlerFunc(func(line Line, ctx Context) (bool, error) {
if nlines == 0 {
return false, nil
}
nlines--
b.Raw = append(b.Raw, md.Run(line))
if nlines == 0 {
ctx.Emit(b)
ctx.Emit(md.End{})
}
return true, nil
})
}