Function cmark_parse_reference_inline

src/inlines.c:1443–1503

Parse reference. Assumes string begins with '[' character. Modify refmap if a reference is encountered. Return 0 if no reference found, otherwise position of subject after reference is parsed.

// Return 0 if no reference found, otherwise position of subject
// after reference is parsed.
bufsize_t cmark_parse_reference_inline(cmark_mem *mem, cmark_chunk *input,
                                       cmark_reference_map *refmap) {
  subject subj;

  cmark_chunk lab;
  cmark_chunk url;
  cmark_chunk title;

  bufsize_t matchlen = 0;
  bufsize_t beforetitle;

  subject_from_buf(mem, -1, 0, &subj, input, NULL);

  // parse label:
  if (!link_label(&subj, &lab) || lab.len == 0)
    return 0;

  // colon:
  if (peek_char(&subj) == ':') {
    advance(&subj);
  } else {
    return 0;
  }

  // parse link url:
  spnl(&subj);
  if ((matchlen = manual_scan_link_url(&subj.input, subj.pos, &url)) > -1) {
    subj.pos += matchlen;
  } else {
    return 0;
  }

  // parse optional link_title
  beforetitle = subj.pos;
  spnl(&subj);
  matchlen = subj.pos == beforetitle ? 0 : scan_link_title(&subj.input, subj.pos);
  if (matchlen) {
    title = cmark_chunk_dup(&subj.input, subj.pos, matchlen);
    subj.pos += matchlen;
  } else {
    subj.pos = beforetitle;
    title = cmark_chunk_literal("");
  }

  // parse final spaces and newline:
  skip_spaces(&subj);
  if (!skip_line_end(&subj)) {
    if (matchlen) { // try rewinding before title
      subj.pos = beforetitle;
      skip_spaces(&subj);
      if (!skip_line_end(&subj)) {
        return 0;
      }
    } else {
      return 0;
    }
  }
  // insert reference into refmap