Method fencedCodeBlock

block.go:669–714

fencedCodeBlock returns the end index if data contains a fenced code block at the beginning, or 0 otherwise. It writes to out if doRender is true, otherwise it has no side effects. If doRender is true, a final newline is mandatory to recognize the fenced code block.

(data []byte, doRender bool)

// or 0 otherwise. It writes to out if doRender is true, otherwise it has no side effects.
// If doRender is true, a final newline is mandatory to recognize the fenced code block.
func (p *Markdown) fencedCodeBlock(data []byte, doRender bool) int {
	var info string
	beg, marker := isFenceLine(data, &info, "")
	if beg == 0 || beg >= len(data) {
		return 0
	}
	fenceLength := beg - 1

	var work bytes.Buffer
	work.Write([]byte(info))
	work.WriteByte('\n')

	for {
		// safe to assume beg < len(data)

		// check for the end of the code block
		fenceEnd, _ := isFenceLine(data[beg:], nil, marker)
		if fenceEnd != 0 {
			beg += fenceEnd
			break
		}

		// copy the current line
		end := skipUntilChar(data, beg, '\n') + 1

		// did we reach the end of the buffer without a closing marker?
		if end >= len(data) {
			return 0
		}

		// verbatim copy to the working buffer
		if doRender {
			work.Write(data[beg:end])
		}
		beg = end
	}

	if doRender {
		block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
		block.IsFenced = true
		block.FenceLength = fenceLength
		finalizeCodeBlock(block)
	}

	return beg
}

func unescapeChar(str []byte) []byte {
	if str[0] == '\\' {