forked from OSchip/llvm-project
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
//===--- SemanticSelection.cpp -----------------------------------*- C++-*-===//
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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 "SemanticSelection.h"
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#include "ParsedAST.h"
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#include "Protocol.h"
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#include "Selection.h"
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#include "SourceCode.h"
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#include "clang/AST/DeclBase.h"
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#include "clang/Basic/SourceLocation.h"
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#include "llvm/Support/Error.h"
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namespace clang {
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namespace clangd {
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namespace {
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// Adds Range \p R to the Result if it is distinct from the last added Range.
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// Assumes that only consecutive ranges can coincide.
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void addIfDistinct(const Range &R, std::vector<Range> &Result) {
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if (Result.empty() || Result.back() != R) {
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Result.push_back(R);
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}
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}
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} // namespace
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llvm::Expected<std::vector<Range>> getSemanticRanges(ParsedAST &AST,
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Position Pos) {
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std::vector<Range> Result;
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const auto &SM = AST.getSourceManager();
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const auto &LangOpts = AST.getLangOpts();
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auto FID = SM.getMainFileID();
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auto Offset = positionToOffset(SM.getBufferData(FID), Pos);
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if (!Offset) {
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return Offset.takeError();
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}
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// Get node under the cursor.
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SelectionTree ST(AST.getASTContext(), AST.getTokens(), *Offset);
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for (const auto *Node = ST.commonAncestor(); Node != nullptr;
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Node = Node->Parent) {
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if (const Decl *D = Node->ASTNode.get<Decl>()) {
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if (llvm::isa<TranslationUnitDecl>(D)) {
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break;
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}
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}
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auto SR = toHalfOpenFileRange(SM, LangOpts, Node->ASTNode.getSourceRange());
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if (!SR.hasValue() || SM.getFileID(SR->getBegin()) != SM.getMainFileID()) {
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continue;
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}
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Range R;
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R.start = sourceLocToPosition(SM, SR->getBegin());
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R.end = sourceLocToPosition(SM, SR->getEnd());
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addIfDistinct(R, Result);
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}
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return Result;
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}
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} // namespace clangd
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} // namespace clang
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