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Viewing file:     parse_link_destination.js (1.49 KB)      -rw-r--r--

// Parse link destination
//
'use strict';


var unescapeAll = require('../common/utils').unescapeAll;


module.exports = function parseLinkDestination(str, pos, max) {
  var code, level,
      lines = 0,
      start = pos,
      result = {
        ok: false,
        pos: 0,
        lines: 0,
        str: ''
      };

  if (str.charCodeAt(pos) === 0x3C /* < */) {
    pos++;
    while (pos < max) {
      code = str.charCodeAt(pos);
      if (code === 0x0A /* \n */) { return result; }
      if (code === 0x3E /* > */) {
        result.pos = pos + 1;
        result.str = unescapeAll(str.slice(start + 1, pos));
        result.ok = true;
        return result;
      }
      if (code === 0x5C /* \ */ && pos + 1 < max) {
        pos += 2;
        continue;
      }

      pos++;
    }

    // no closing '>'
    return result;
  }

  // this should be ... } else { ... branch

  level = 0;
  while (pos < max) {
    code = str.charCodeAt(pos);

    if (code === 0x20) { break; }

    // ascii control characters
    if (code < 0x20 || code === 0x7F) { break; }

    if (code === 0x5C /* \ */ && pos + 1 < max) {
      pos += 2;
      continue;
    }

    if (code === 0x28 /* ( */) {
      level++;
    }

    if (code === 0x29 /* ) */) {
      if (level === 0) { break; }
      level--;
    }

    pos++;
  }

  if (start === pos) { return result; }
  if (level !== 0) { return result; }

  result.str = unescapeAll(str.slice(start, pos));
  result.lines = lines;
  result.pos = pos;
  result.ok = true;
  return result;
};