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//===--- RefactoringCallbacks.cpp - Structural query framework ------------===//
//
// 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 "clang/Tooling/RefactoringCallbacks.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Lex/Lexer.h"
using llvm::StringError;
using llvm::make_error;
namespace clang {
namespace tooling {
RefactoringCallback::RefactoringCallback() {}
tooling::Replacements &RefactoringCallback::getReplacements() {
return Replace;
}
ASTMatchRefactorer::ASTMatchRefactorer(
std::map<std::string, Replacements> &FileToReplaces)
: FileToReplaces(FileToReplaces) {}
void ASTMatchRefactorer::addDynamicMatcher(
const ast_matchers::internal::DynTypedMatcher &Matcher,
RefactoringCallback *Callback) {
MatchFinder.addDynamicMatcher(Matcher, Callback);
Callbacks.push_back(Callback);
}
class RefactoringASTConsumer : public ASTConsumer {
public:
explicit RefactoringASTConsumer(ASTMatchRefactorer &Refactoring)
: Refactoring(Refactoring) {}
void HandleTranslationUnit(ASTContext &Context) override {
// The ASTMatchRefactorer is re-used between translation units.
// Clear the matchers so that each Replacement is only emitted once.
for (const auto &Callback : Refactoring.Callbacks) {
Callback->getReplacements().clear();
}
Refactoring.MatchFinder.matchAST(Context);
for (const auto &Callback : Refactoring.Callbacks) {
for (const auto &Replacement : Callback->getReplacements()) {
llvm::Error Err =
Refactoring.FileToReplaces[std::string(Replacement.getFilePath())]
.add(Replacement);
if (Err) {
llvm::errs() << "Skipping replacement " << Replacement.toString()
<< " due to this error:\n"
<< toString(std::move(Err)) << "\n";
}
}
}
}
private:
ASTMatchRefactorer &Refactoring;
};
std::unique_ptr<ASTConsumer> ASTMatchRefactorer::newASTConsumer() {
return std::make_unique<RefactoringASTConsumer>(*this);
}
static Replacement replaceStmtWithText(SourceManager &Sources, const Stmt &From,
StringRef Text) {
return tooling::Replacement(
Sources, CharSourceRange::getTokenRange(From.getSourceRange()), Text);
}
static Replacement replaceStmtWithStmt(SourceManager &Sources, const Stmt &From,
const Stmt &To) {
return replaceStmtWithText(
Sources, From,
Lexer::getSourceText(CharSourceRange::getTokenRange(To.getSourceRange()),
Sources, LangOptions()));
}
ReplaceStmtWithText::ReplaceStmtWithText(StringRef FromId, StringRef ToText)
: FromId(std::string(FromId)), ToText(std::string(ToText)) {}
void ReplaceStmtWithText::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (const Stmt *FromMatch = Result.Nodes.getNodeAs<Stmt>(FromId)) {
auto Err = Replace.add(tooling::Replacement(
*Result.SourceManager,
CharSourceRange::getTokenRange(FromMatch->getSourceRange()), ToText));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
}
}
ReplaceStmtWithStmt::ReplaceStmtWithStmt(StringRef FromId, StringRef ToId)
: FromId(std::string(FromId)), ToId(std::string(ToId)) {}
void ReplaceStmtWithStmt::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
const Stmt *FromMatch = Result.Nodes.getNodeAs<Stmt>(FromId);
const Stmt *ToMatch = Result.Nodes.getNodeAs<Stmt>(ToId);
if (FromMatch && ToMatch) {
auto Err = Replace.add(
replaceStmtWithStmt(*Result.SourceManager, *FromMatch, *ToMatch));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
}
}
ReplaceIfStmtWithItsBody::ReplaceIfStmtWithItsBody(StringRef Id,
bool PickTrueBranch)
: Id(std::string(Id)), PickTrueBranch(PickTrueBranch) {}
void ReplaceIfStmtWithItsBody::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (const IfStmt *Node = Result.Nodes.getNodeAs<IfStmt>(Id)) {
const Stmt *Body = PickTrueBranch ? Node->getThen() : Node->getElse();
if (Body) {
auto Err =
Replace.add(replaceStmtWithStmt(*Result.SourceManager, *Node, *Body));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
} else if (!PickTrueBranch) {
// If we want to use the 'else'-branch, but it doesn't exist, delete
// the whole 'if'.
auto Err =
Replace.add(replaceStmtWithText(*Result.SourceManager, *Node, ""));
// FIXME: better error handling. For now, just print error message in the
// release version.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
assert(false);
}
}
}
}
ReplaceNodeWithTemplate::ReplaceNodeWithTemplate(
llvm::StringRef FromId, std::vector<TemplateElement> Template)
: FromId(std::string(FromId)), Template(std::move(Template)) {}
llvm::Expected<std::unique_ptr<ReplaceNodeWithTemplate>>
ReplaceNodeWithTemplate::create(StringRef FromId, StringRef ToTemplate) {
std::vector<TemplateElement> ParsedTemplate;
for (size_t Index = 0; Index < ToTemplate.size();) {
if (ToTemplate[Index] == '$') {
if (ToTemplate.substr(Index, 2) == "$$") {
Index += 2;
ParsedTemplate.push_back(
TemplateElement{TemplateElement::Literal, "$"});
} else if (ToTemplate.substr(Index, 2) == "${") {
size_t EndOfIdentifier = ToTemplate.find("}", Index);
if (EndOfIdentifier == std::string::npos) {
return make_error<StringError>(
"Unterminated ${...} in replacement template near " +
ToTemplate.substr(Index),
llvm::inconvertibleErrorCode());
}
std::string SourceNodeName = std::string(
ToTemplate.substr(Index + 2, EndOfIdentifier - Index - 2));
ParsedTemplate.push_back(
TemplateElement{TemplateElement::Identifier, SourceNodeName});
Index = EndOfIdentifier + 1;
} else {
return make_error<StringError>(
"Invalid $ in replacement template near " +
ToTemplate.substr(Index),
llvm::inconvertibleErrorCode());
}
} else {
size_t NextIndex = ToTemplate.find('$', Index + 1);
ParsedTemplate.push_back(TemplateElement{
TemplateElement::Literal,
std::string(ToTemplate.substr(Index, NextIndex - Index))});
Index = NextIndex;
}
}
return std::unique_ptr<ReplaceNodeWithTemplate>(
new ReplaceNodeWithTemplate(FromId, std::move(ParsedTemplate)));
}
void ReplaceNodeWithTemplate::run(
const ast_matchers::MatchFinder::MatchResult &Result) {
const auto &NodeMap = Result.Nodes.getMap();
std::string ToText;
for (const auto &Element : Template) {
switch (Element.Type) {
case TemplateElement::Literal:
ToText += Element.Value;
break;
case TemplateElement::Identifier: {
auto NodeIter = NodeMap.find(Element.Value);
if (NodeIter == NodeMap.end()) {
llvm::errs() << "Node " << Element.Value
<< " used in replacement template not bound in Matcher \n";
llvm::report_fatal_error("Unbound node in replacement template.");
}
CharSourceRange Source =
CharSourceRange::getTokenRange(NodeIter->second.getSourceRange());
ToText += Lexer::getSourceText(Source, *Result.SourceManager,
Result.Context->getLangOpts());
break;
}
}
}
if (NodeMap.count(FromId) == 0) {
llvm::errs() << "Node to be replaced " << FromId
<< " not bound in query.\n";
llvm::report_fatal_error("FromId node not bound in MatchResult");
}
auto Replacement =
tooling::Replacement(*Result.SourceManager, &NodeMap.at(FromId), ToText,
Result.Context->getLangOpts());
llvm::Error Err = Replace.add(Replacement);
if (Err) {
llvm::errs() << "Query and replace failed in " << Replacement.getFilePath()
<< "! " << llvm::toString(std::move(Err)) << "\n";
llvm::report_fatal_error("Replacement failed");
}
}
} // end namespace tooling
} // end namespace clang
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