示例#1
0
 void visit(Syntax Node) override {
   if (didReuseNode(Node.getId())) {
     // Node has been reused, add it to the list
     auto Start = Node.getAbsolutePositionBeforeLeadingTrivia();
     auto End = Node.getAbsoluteEndPositionAfterTrailingTrivia();
     ReusedRegions.push_back({Start, End});
   } else {
     SyntaxVisitor::visit(Node);
   }
 }
示例#2
0
bool SyntaxParsingCache::nodeCanBeReused(const Syntax &Node, size_t NodeStart,
                                         size_t Position,
                                         SyntaxKind Kind) const {
  // Computing the value of NodeStart on the fly is faster than determining a
  // node's absolute position, but make sure the values match in an assertion
  // build
  assert(NodeStart == Node.getAbsolutePositionBeforeLeadingTrivia().getOffset());

  if (NodeStart != Position)
    return false;
  if (Node.getKind() != Kind)
    return false;

  // Node can also not be reused if an edit has been made in the next token's
  // text, e.g. because `private struct Foo {}` parses as a CodeBlockItem with a
  // StructDecl inside and `private struc Foo {}` parses as two CodeBlockItems
  // one for `private` and one for `struc Foo {}`
  size_t NextLeafNodeLength = 0;
  if (auto NextNode = Node.getData().getNextNode()) {
    auto NextLeafNode = NextNode->getFirstToken();
    auto NextRawNode = NextLeafNode->getRaw();
    assert(NextRawNode->isPresent());
    NextLeafNodeLength += NextRawNode->getTokenText().size();
    for (auto TriviaPiece : NextRawNode->getLeadingTrivia()) {
      NextLeafNodeLength += TriviaPiece.getTextLength();
    }
  }

  auto NodeEnd = NodeStart + Node.getTextLength();
  for (auto Edit : Edits) {
    // Check if this node or the trivia of the next node has been edited. If it
    // has, we cannot reuse it.
    if (Edit.intersectsOrTouchesRange(NodeStart, NodeEnd + NextLeafNodeLength))
      return false;
  }

  return true;
}