feat: Waku v2 bridge

Issue #12610

vendor/github.com/status-im/markdown/parser/caption.go

@@ -0,0 +1,70 @@
+package parser
+
+import (
+	"bytes"
+)
+
+// caption checks for a caption, it returns the caption data and a potential "headingID".
+func (p *Parser) caption(data, caption []byte) ([]byte, string, int) {
+	if !bytes.HasPrefix(data, caption) {
+		return nil, "", 0
+	}
+	j := len(caption)
+	data = data[j:]
+	end := p.linesUntilEmpty(data)
+
+	data = data[:end]
+
+	id, start := captionID(data)
+	if id != "" {
+		return data[:start], id, end + j
+	}
+
+	return data, "", end + j
+}
+
+// linesUntilEmpty scans lines up to the first empty line.
+func (p *Parser) linesUntilEmpty(data []byte) int {
+	line, i := 0, 0
+
+	for line < len(data) {
+		i++
+
+		// find the end of this line
+		for i < len(data) && data[i-1] != '\n' {
+			i++
+		}
+
+		if p.isEmpty(data[line:i]) == 0 {
+			line = i
+			continue
+		}
+
+		break
+	}
+	return i
+}
+
+// captionID checks if the caption *ends* in {#....}. If so the text after {# is taken to be
+// the ID/anchor of the entire figure block.
+func captionID(data []byte) (string, int) {
+	end := len(data)
+
+	j, k := 0, 0
+	// find start/end of heading id
+	for j = 0; j < end-1 && (data[j] != '{' || data[j+1] != '#'); j++ {
+	}
+	for k = j + 1; k < end && data[k] != '}'; k++ {
+	}
+	// remains must be whitespace.
+	for l := k + 1; l < end; l++ {
+		if !isSpace(data[l]) {
+			return "", 0
+		}
+	}
+
+	if j > 0 && k > 0 && j+2 < k {
+		return string(data[j+2 : k]), j
+	}
+	return "", 0
+}