1//===---- NamespaceAliaserTest.cpp - clang-tidy
2//----------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#include "../clang-tidy/utils/NamespaceAliaser.h"
11
12#include "ClangTidyTest.h"
13#include "clang/ASTMatchers/ASTMatchFinder.h"
14#include "clang/ASTMatchers/ASTMatchers.h"
15#include "gtest/gtest.h"
16
17namespace clang {
18namespace tidy {
19namespace utils {
20// This checker is for testing only. It can only run on one test case
21// (e.g. with one SourceManager).
22class InsertAliasCheck : public ClangTidyCheck {
23public:
24 InsertAliasCheck(StringRef Name, ClangTidyContext *Context)
25 :ClangTidyCheck(Name, Context) {}
26 void registerMatchers(ast_matchers::MatchFinder *Finder) override {
27 Finder->addMatcher(NodeMatch: ast_matchers::callExpr().bind(ID: "foo"), Action: this);
28 }
29 void check(const ast_matchers::MatchFinder::MatchResult &Result) override {
30 if (!Aliaser)
31 Aliaser.reset(p: new NamespaceAliaser(*Result.SourceManager));
32
33 const auto *Call = Result.Nodes.getNodeAs<CallExpr>(ID: "foo");
34 assert(Call != nullptr && "Did not find node \"foo\"");
35 auto Hint = Aliaser->createAlias(*Result.Context, *Call, "::foo::bar",
36 {"b", "some_alias"});
37 if (Hint)
38 diag(Loc: Call->getBeginLoc(), Description: "Fix for testing") << *Hint;
39
40 diag(Loc: Call->getBeginLoc(), Description: "insert call") << FixItHint::CreateInsertion(
41 InsertionLoc: Call->getBeginLoc(),
42 Code: Aliaser->getNamespaceName(*Result.Context, *Call, "::foo::bar") + "::");
43 }
44
45private:
46 std::unique_ptr<NamespaceAliaser> Aliaser;
47};
48
49template <typename Check>
50std::string runChecker(StringRef Code, unsigned ExpectedWarningCount) {
51 std::map<StringRef, StringRef> AdditionalFileContents = {{"foo.h",
52 "namespace foo {\n"
53 "namespace bar {\n"
54 "}\n"
55 "void func() { }\n"
56 "}"}};
57 std::vector<ClangTidyError> errors;
58
59 std::string result = test::runCheckOnCode<Check>(
60 Code, &errors, "foo.cc", {}, ClangTidyOptions(), AdditionalFileContents);
61
62 EXPECT_EQ(ExpectedWarningCount, errors.size());
63 return result;
64}
65
66TEST(NamespaceAliaserTest, AddNewAlias) {
67 EXPECT_EQ("#include \"foo.h\"\n"
68 "void f() {\n"
69 "namespace b = ::foo::bar;"
70 " b::f(); }",
71 runChecker<InsertAliasCheck>("#include \"foo.h\"\n"
72 "void f() { f(); }",
73 2));
74}
75
76TEST(NamespaceAliaserTest, ReuseAlias) {
77 EXPECT_EQ(
78 "#include \"foo.h\"\n"
79 "void f() { namespace x = foo::bar; x::f(); }",
80 runChecker<InsertAliasCheck>("#include \"foo.h\"\n"
81 "void f() { namespace x = foo::bar; f(); }",
82 1));
83}
84
85TEST(NamespaceAliaserTest, AddsOnlyOneAlias) {
86 EXPECT_EQ("#include \"foo.h\"\n"
87 "void f() {\n"
88 "namespace b = ::foo::bar;"
89 " b::f(); b::f(); }",
90 runChecker<InsertAliasCheck>("#include \"foo.h\"\n"
91 "void f() { f(); f(); }",
92 3));
93}
94
95TEST(NamespaceAliaserTest, LocalConflict) {
96 EXPECT_EQ("#include \"foo.h\"\n"
97 "void f() {\n"
98 "namespace some_alias = ::foo::bar;"
99 " namespace b = foo; some_alias::f(); }",
100 runChecker<InsertAliasCheck>("#include \"foo.h\"\n"
101 "void f() { namespace b = foo; f(); }",
102 2));
103}
104
105TEST(NamespaceAliaserTest, GlobalConflict) {
106 EXPECT_EQ("#include \"foo.h\"\n"
107 "namespace b = foo;\n"
108 "void f() {\n"
109 "namespace some_alias = ::foo::bar;"
110 " some_alias::f(); }",
111 runChecker<InsertAliasCheck>("#include \"foo.h\"\n"
112 "namespace b = foo;\n"
113 "void f() { f(); }",
114 2));
115}
116
117} // namespace utils
118} // namespace tidy
119} // namespace clang
120

source code of clang-tools-extra/unittests/clang-tidy/NamespaceAliaserTest.cpp