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