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//===--- SourceExtraction.cpp - Clang refactoring library -----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "SourceExtraction.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/StmtObjC.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Lexer.h"
using namespace clang;
namespace {
/// Returns true if the token at the given location is a semicolon.
bool isSemicolonAtLocation(SourceLocation TokenLoc, const SourceManager &SM,
const LangOptions &LangOpts) {
return Lexer::getSourceText(
CharSourceRange::getTokenRange(TokenLoc, TokenLoc), SM,
LangOpts) == ";";
}
/// Returns true if there should be a semicolon after the given statement.
bool isSemicolonRequiredAfter(const Stmt *S) {
if (isa<CompoundStmt>(S))
return false;
if (const auto *If = dyn_cast<IfStmt>(S))
return isSemicolonRequiredAfter(If->getElse() ? If->getElse()
: If->getThen());
if (const auto *While = dyn_cast<WhileStmt>(S))
return isSemicolonRequiredAfter(While->getBody());
if (const auto *For = dyn_cast<ForStmt>(S))
return isSemicolonRequiredAfter(For->getBody());
if (const auto *CXXFor = dyn_cast<CXXForRangeStmt>(S))
return isSemicolonRequiredAfter(CXXFor->getBody());
if (const auto *ObjCFor = dyn_cast<ObjCForCollectionStmt>(S))
return isSemicolonRequiredAfter(ObjCFor->getBody());
switch (S->getStmtClass()) {
case Stmt::SwitchStmtClass:
case Stmt::CXXTryStmtClass:
case Stmt::ObjCAtSynchronizedStmtClass:
case Stmt::ObjCAutoreleasePoolStmtClass:
case Stmt::ObjCAtTryStmtClass:
return false;
default:
return true;
}
}
/// Returns true if the two source locations are on the same line.
bool areOnSameLine(SourceLocation Loc1, SourceLocation Loc2,
const SourceManager &SM) {
return !Loc1.isMacroID() && !Loc2.isMacroID() &&
SM.getSpellingLineNumber(Loc1) == SM.getSpellingLineNumber(Loc2);
}
} // end anonymous namespace
namespace clang {
namespace tooling {
ExtractionSemicolonPolicy
ExtractionSemicolonPolicy::compute(const Stmt *S, SourceRange &ExtractedRange,
const SourceManager &SM,
const LangOptions &LangOpts) {
auto neededInExtractedFunction = []() {
return ExtractionSemicolonPolicy(true, false);
};
auto neededInOriginalFunction = []() {
return ExtractionSemicolonPolicy(false, true);
};
/// The extracted expression should be terminated with a ';'. The call to
/// the extracted function will replace this expression, so it won't need
/// a terminating ';'.
if (isa<Expr>(S))
return neededInExtractedFunction();
/// Some statements don't need to be terminated with ';'. The call to the
/// extracted function will be a standalone statement, so it should be
/// terminated with a ';'.
bool NeedsSemi = isSemicolonRequiredAfter(S);
if (!NeedsSemi)
return neededInOriginalFunction();
/// Some statements might end at ';'. The extraction will move that ';', so
/// the call to the extracted function should be terminated with a ';'.
SourceLocation End = ExtractedRange.getEnd();
if (isSemicolonAtLocation(End, SM, LangOpts))
return neededInOriginalFunction();
/// Other statements should generally have a trailing ';'. We can try to find
/// it and move it together it with the extracted code.
Optional<Token> NextToken = Lexer::findNextToken(End, SM, LangOpts);
if (NextToken && NextToken->is(tok::semi) &&
areOnSameLine(NextToken->getLocation(), End, SM)) {
ExtractedRange.setEnd(NextToken->getLocation());
return neededInOriginalFunction();
}
/// Otherwise insert semicolons in both places.
return ExtractionSemicolonPolicy(true, true);
}
} // end namespace tooling
} // end namespace clang
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