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Viewing file:     resolve-pathname.js (1.72 KB)      -rw-r--r--

function isAbsolute(pathname) {
  return pathname.charAt(0) === '/';
}

// About 1.5x faster than the two-arg version of Array#splice()
function spliceOne(list, index) {
  for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1) {
    list[i] = list[k];
  }

  list.pop();
}

// This implementation is based heavily on node's url.parse
function resolvePathname(to, from) {
  if (from === undefined) from = '';

  var toParts = (to && to.split('/')) || [];
  var fromParts = (from && from.split('/')) || [];

  var isToAbs = to && isAbsolute(to);
  var isFromAbs = from && isAbsolute(from);
  var mustEndAbs = isToAbs || isFromAbs;

  if (to && isAbsolute(to)) {
    // to is absolute
    fromParts = toParts;
  } else if (toParts.length) {
    // to is relative, drop the filename
    fromParts.pop();
    fromParts = fromParts.concat(toParts);
  }

  if (!fromParts.length) return '/';

  var hasTrailingSlash;
  if (fromParts.length) {
    var last = fromParts[fromParts.length - 1];
    hasTrailingSlash = last === '.' || last === '..' || last === '';
  } else {
    hasTrailingSlash = false;
  }

  var up = 0;
  for (var i = fromParts.length; i >= 0; i--) {
    var part = fromParts[i];

    if (part === '.') {
      spliceOne(fromParts, i);
    } else if (part === '..') {
      spliceOne(fromParts, i);
      up++;
    } else if (up) {
      spliceOne(fromParts, i);
      up--;
    }
  }

  if (!mustEndAbs) for (; up--; up) fromParts.unshift('..');

  if (
    mustEndAbs &&
    fromParts[0] !== '' &&
    (!fromParts[0] || !isAbsolute(fromParts[0]))
  )
    fromParts.unshift('');

  var result = fromParts.join('/');

  if (hasTrailingSlash && result.substr(-1) !== '/') result += '/';

  return result;
}

export default resolvePathname;