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1 //===---------- NamespaceAliaser.cpp - clang-tidy -------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "NamespaceAliaser.h"
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10
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11 #include "ASTUtils.h"
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12 #include "clang/ASTMatchers/ASTMatchFinder.h"
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13 #include "clang/ASTMatchers/ASTMatchers.h"
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14 #include "clang/Lex/Lexer.h"
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15 namespace clang {
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16 namespace tidy {
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17 namespace utils {
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18
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19 using namespace ast_matchers;
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20
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21 NamespaceAliaser::NamespaceAliaser(const SourceManager &SourceMgr)
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22 : SourceMgr(SourceMgr) {}
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23
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24 AST_MATCHER_P(NamespaceAliasDecl, hasTargetNamespace,
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25 ast_matchers::internal::Matcher<NamespaceDecl>, innerMatcher) {
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26 return innerMatcher.matches(*Node.getNamespace(), Finder, Builder);
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27 }
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28
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29 Optional<FixItHint>
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30 NamespaceAliaser::createAlias(ASTContext &Context, const Stmt &Statement,
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31 StringRef Namespace,
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32 const std::vector<std::string> &Abbreviations) {
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33 const FunctionDecl *Function = getSurroundingFunction(Context, Statement);
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34 if (!Function || !Function->hasBody())
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35 return None;
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36
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37 if (AddedAliases[Function].count(Namespace.str()) != 0)
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38 return None;
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39
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40 // FIXME: Doesn't consider the order of declarations.
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41 // If we accidentally pick an alias defined later in the function,
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42 // the output won't compile.
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43 // FIXME: Also doesn't consider file or class-scope aliases.
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44
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45 const auto *ExistingAlias = selectFirst<NamedDecl>(
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46 "alias", match(functionDecl(hasBody(compoundStmt(has(declStmt(
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47 has(namespaceAliasDecl(hasTargetNamespace(hasName(
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48 std::string(Namespace))))
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49 .bind("alias"))))))),
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50 *Function, Context));
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51
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52 if (ExistingAlias != nullptr) {
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53 AddedAliases[Function][Namespace.str()] = ExistingAlias->getName().str();
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54 return None;
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55 }
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56
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57 for (const auto &Abbreviation : Abbreviations) {
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58 DeclarationMatcher ConflictMatcher = namedDecl(hasName(Abbreviation));
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59 const auto HasConflictingChildren =
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60 !match(findAll(ConflictMatcher), *Function, Context).empty();
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61 const auto HasConflictingAncestors =
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62 !match(functionDecl(hasAncestor(decl(has(ConflictMatcher)))), *Function,
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63 Context)
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64 .empty();
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65 if (HasConflictingAncestors || HasConflictingChildren)
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66 continue;
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67
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68 std::string Declaration =
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69 (llvm::Twine("\nnamespace ") + Abbreviation + " = " + Namespace + ";")
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70 .str();
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71 SourceLocation Loc =
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72 Lexer::getLocForEndOfToken(Function->getBody()->getBeginLoc(), 0,
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73 SourceMgr, Context.getLangOpts());
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74 AddedAliases[Function][Namespace.str()] = Abbreviation;
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75 return FixItHint::CreateInsertion(Loc, Declaration);
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76 }
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77
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78 return None;
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79 }
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80
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81 std::string NamespaceAliaser::getNamespaceName(ASTContext &Context,
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82 const Stmt &Statement,
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83 StringRef Namespace) const {
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84 const auto *Function = getSurroundingFunction(Context, Statement);
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85 auto FunctionAliases = AddedAliases.find(Function);
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86 if (FunctionAliases != AddedAliases.end()) {
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87 if (FunctionAliases->second.count(Namespace) != 0) {
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88 return FunctionAliases->second.find(Namespace)->getValue();
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89 }
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90 }
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91 return Namespace.str();
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92 }
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93
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94 } // namespace utils
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95 } // namespace tidy
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96 } // namespace clang
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