56c54cf66b
Mostly mechanics here. Interesting decisions: - apply disambiguation in-place instead of copying the forest debatable, but even the final tree size is significant - split decide/apply into different functions - this allows the hard part (decide) to be tested non-destructively and combined with HTML forest easily - add non-const accessors to forest to enable apply - unit tests but no lit tests: my plan is to test actual C++ disambiguation heuristics with lit, generic disambiguation mechanics without the C++ grammar Differential Revision: https://reviews.llvm.org/D132487
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
//===--- Disambiguate.cpp - Find the best tree in the forest --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "clang-pseudo/Disambiguate.h"
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namespace clang::pseudo {
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Disambiguation disambiguate(const ForestNode *Root,
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const DisambiguateParams &Params) {
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// FIXME: this is a dummy placeholder strategy, implement a real one!
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Disambiguation Result;
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for (const ForestNode &N : Root->descendants()) {
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if (N.kind() == ForestNode::Ambiguous)
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Result.try_emplace(&N, 1);
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}
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return Result;
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}
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void removeAmbiguities(ForestNode *&Root, const Disambiguation &D) {
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std::vector<ForestNode **> Queue = {&Root};
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while (!Queue.empty()) {
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ForestNode **Next = Queue.back();
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Queue.pop_back();
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switch ((*Next)->kind()) {
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case ForestNode::Sequence:
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for (ForestNode *&Child : (*Next)->elements())
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Queue.push_back(&Child);
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break;
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case ForestNode::Ambiguous: {
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assert(D.count(*Next) != 0 && "disambiguation is incomplete!");
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ForestNode *ChosenChild = (*Next)->alternatives()[D.lookup(*Next)];
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*Next = ChosenChild;
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Queue.push_back(Next);
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break;
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}
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case ForestNode::Terminal:
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case ForestNode::Opaque:
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break;
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}
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}
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}
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} // namespace clang::pseudo
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