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callouts.go
41 lines (36 loc) · 888 Bytes
/
callouts.go
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package xml
import (
"bytes"
"fmt"
"io"
"github.com/gomarkdown/markdown/html"
"github.com/gomarkdown/markdown/parser"
)
// EscapeHTMLCallouts writes html-escaped d to w. It escapes &, <, > and " characters, *but*
// expands callouts <<N>> with the callout HTML, i.e. by calling rendering it as <N>.
func EscapeHTMLCallouts(w io.Writer, d []byte, comments [][]byte) {
ld := len(d)
Parse:
for i := 0; i < ld; i++ {
for _, comment := range comments {
if !bytes.HasPrefix(d[i:], comment) {
break
}
lc := len(comment)
if i+lc < ld {
if id, consumed := parser.IsCallout(d[i+lc:]); consumed > 0 {
// We have seen a callout
io.WriteString(w, fmt.Sprintf("<%s>", id))
i += consumed + lc - 1
continue Parse
}
}
}
escSeq := html.Escaper[d[i]]
if escSeq != nil {
w.Write(escSeq)
} else {
w.Write([]byte{d[i]})
}
}
}