areSyntacticallyIdenticalExceptUri static method

bool areSyntacticallyIdenticalExceptUri(NamespaceDirective node1, NamespaceDirective node2)

Return true if the non-URI components of the two directives are syntactically identical. URIs are checked outside to see if they resolve to the same absolute URI, so to the same library, regardless of the used syntax (absolute, relative, not normalized).

Implementation

static bool areSyntacticallyIdenticalExceptUri(
  NamespaceDirective node1,
  NamespaceDirective node2,
) {
  if (node1 is ImportDirective &&
      node2 is ImportDirective &&
      node1.prefix?.name != node2.prefix?.name) {
    return false;
  }

  bool areSameNames(
    List<SimpleIdentifier> names1,
    List<SimpleIdentifier> names2,
  ) {
    if (names1.length != names2.length) {
      return false;
    }
    for (var i = 0; i < names1.length; i++) {
      if (names1[i].name != names2[i].name) {
        return false;
      }
    }
    return true;
  }

  final combinators1 = node1.combinators;
  final combinators2 = node2.combinators;
  if (combinators1.length != combinators2.length) {
    return false;
  }
  for (var i = 0; i < combinators1.length; i++) {
    final combinator1 = combinators1[i];
    final combinator2 = combinators2[i];
    if (combinator1 is HideCombinator && combinator2 is HideCombinator) {
      if (!areSameNames(combinator1.hiddenNames, combinator2.hiddenNames)) {
        return false;
      }
    } else if (combinator1 is ShowCombinator &&
        combinator2 is ShowCombinator) {
      if (!areSameNames(combinator1.shownNames, combinator2.shownNames)) {
        return false;
      }
    } else {
      return false;
    }
  }

  return true;
}