| //===--- UnknownSyntax.cpp - Swift Unknown Syntax Implementation ---------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "swift/Syntax/TokenSyntax.h" |
| #include "swift/Syntax/UnknownSyntax.h" |
| |
| using namespace swift; |
| using namespace swift::syntax; |
| |
| void UnknownSyntax::validate() const { |
| assert(Data->Raw->isUnknown()); |
| } |
| |
| #pragma mark - unknown-syntax API |
| |
| size_t UnknownSyntax::getNumChildren() const { |
| size_t NonTokenChildren = 0; |
| for (auto Child : getRaw()->Layout) { |
| if (!Child->isToken()) { |
| ++NonTokenChildren; |
| } |
| } |
| return NonTokenChildren; |
| } |
| |
| Syntax UnknownSyntax::getChild(const size_t N) const { |
| // The actual index of the Nth non-token child. |
| size_t ActualIndex = 0; |
| // The number of non-token children we've seen. |
| size_t NumNonTokenSeen = 0; |
| for (auto Child : getRaw()->Layout) { |
| // If we see a child that's not a token, count it. |
| if (!Child->isToken()) { |
| ++NumNonTokenSeen; |
| } |
| // If the number of children we've seen indexes the same (count - 1) as |
| // the number we're looking for, then we're done. |
| if (NumNonTokenSeen == N + 1) { break; } |
| |
| // Otherwise increment the actual index and keep searching. |
| ++ActualIndex; |
| } |
| return Syntax { Root, Data->getChild(ActualIndex).get() }; |
| } |
| |