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//===- unittests/AST/ASTPrint.h ------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Helpers to simplify testing of printing of AST constructs provided in the/
// form of the source code.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/SmallString.h"
#include "gtest/gtest.h"
namespace clang {
using PolicyAdjusterType =
Optional<llvm::function_ref<void(PrintingPolicy &Policy)>>;
static void PrintStmt(raw_ostream &Out, const ASTContext *Context,
const Stmt *S, PolicyAdjusterType PolicyAdjuster) {
assert(S != nullptr && "Expected non-null Stmt");
PrintingPolicy Policy = Context->getPrintingPolicy();
if (PolicyAdjuster)
(*PolicyAdjuster)(Policy);
S->printPretty(Out, /*Helper*/ nullptr, Policy);
}
class PrintMatch : public ast_matchers::MatchFinder::MatchCallback {
SmallString<1024> Printed;
unsigned NumFoundStmts;
PolicyAdjusterType PolicyAdjuster;
public:
PrintMatch(PolicyAdjusterType PolicyAdjuster)
: NumFoundStmts(0), PolicyAdjuster(PolicyAdjuster) {}
void run(const ast_matchers::MatchFinder::MatchResult &Result) override {
const Stmt *S = Result.Nodes.getNodeAs<Stmt>("id");
if (!S)
return;
NumFoundStmts++;
if (NumFoundStmts > 1)
return;
llvm::raw_svector_ostream Out(Printed);
PrintStmt(Out, Result.Context, S, PolicyAdjuster);
}
StringRef getPrinted() const { return Printed; }
unsigned getNumFoundStmts() const { return NumFoundStmts; }
};
template <typename T>
::testing::AssertionResult
PrintedStmtMatches(StringRef Code, const std::vector<std::string> &Args,
const T &NodeMatch, StringRef ExpectedPrinted,
PolicyAdjusterType PolicyAdjuster = None) {
PrintMatch Printer(PolicyAdjuster);
ast_matchers::MatchFinder Finder;
Finder.addMatcher(NodeMatch, &Printer);
std::unique_ptr<tooling::FrontendActionFactory> Factory(
tooling::newFrontendActionFactory(&Finder));
if (!tooling::runToolOnCodeWithArgs(Factory->create(), Code, Args))
return testing::AssertionFailure()
<< "Parsing error in \"" << Code.str() << "\"";
if (Printer.getNumFoundStmts() == 0)
return testing::AssertionFailure() << "Matcher didn't find any statements";
if (Printer.getNumFoundStmts() > 1)
return testing::AssertionFailure()
<< "Matcher should match only one statement (found "
<< Printer.getNumFoundStmts() << ")";
if (Printer.getPrinted() != ExpectedPrinted)
return ::testing::AssertionFailure()
<< "Expected \"" << ExpectedPrinted.str() << "\", got \""
<< Printer.getPrinted().str() << "\"";
return ::testing::AssertionSuccess();
}
} // namespace clang
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