references.js

import StateInline from '../rules_inline/state_inline';
import parseLinkLabel from '../helpers/parse_link_label';
import parseLinkDestination from '../helpers/parse_link_destination';
import parseLinkTitle from '../helpers/parse_link_title';
import normalizeReference from '../helpers/normalize_reference';


function parseReference(str, parser, options, env) {
  var state, labelEnd, pos, max, code, start, href, title, label;

  if (str.charCodeAt(0) !== 0x5B/* [ */) { return -1; }

  if (str.indexOf(']:') === -1) { return -1; }

  state = new StateInline(str, parser, options, env, []);
  labelEnd = parseLinkLabel(state, 0);

  if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return -1; }

  max = state.posMax;

  // [label]:   destination   'title'
  //         ^^^ skip optional whitespace here
  for (pos = labelEnd + 2; pos < max; pos++) {
    code = state.src.charCodeAt(pos);
    if (code !== 0x20 && code !== 0x0A) { break; }
  }

  // [label]:   destination   'title'
  //            ^^^^^^^^^^^ parse this
  if (!parseLinkDestination(state, pos)) { return -1; }
  href = state.linkContent;
  pos = state.pos;

  // [label]:   destination   'title'
  //                       ^^^ skipping those spaces
  start = pos;
  for (pos = pos + 1; pos < max; pos++) {
    code = state.src.charCodeAt(pos);
    if (code !== 0x20 && code !== 0x0A) { break; }
  }

  // [label]:   destination   'title'
  //                          ^^^^^^^ parse this
  if (pos < max && start !== pos && parseLinkTitle(state, pos)) {
    title = state.linkContent;
    pos = state.pos;
  } else {
    title = '';
    pos = start;
  }

  // ensure that the end of the line is empty
  while (pos < max && state.src.charCodeAt(pos) === 0x20/* space */) { pos++; }
  if (pos < max && state.src.charCodeAt(pos) !== 0x0A) { return -1; }

  label = normalizeReference(str.slice(1, labelEnd));
  if (typeof env.references[label] === 'undefined') {
    env.references[label] = { title: title, href: href };
  }

  return pos;
}


export default function references(state) {
  var tokens = state.tokens, i, l, content, pos;

  state.env.references = state.env.references || {};

  if (state.inlineMode) {
    return;
  }

  // Scan definitions in paragraph inlines
  for (i = 1, l = tokens.length - 1; i < l; i++) {
    if (tokens[i].type === 'inline' &&
        tokens[i - 1].type === 'paragraph_open' &&
        tokens[i + 1].type === 'paragraph_close') {

      content = tokens[i].content;
      while (content.length) {
        pos = parseReference(content, state.inline, state.options, state.env);
        if (pos < 0) { break; }
        content = content.slice(pos).trim();
      }

      tokens[i].content = content;
      if (!content.length) {
        tokens[i - 1].tight = true;
        tokens[i + 1].tight = true;
      }
    }
  }
};