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//===--- TokenAnalyzer.cpp - Analyze Token Streams --------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements an abstract TokenAnalyzer and associated helper
/// classes. TokenAnalyzer can be extended to generate replacements based on
/// an annotated and pre-processed token stream.
///
//===----------------------------------------------------------------------===//
#include "TokenAnalyzer.h"
#include "AffectedRangeManager.h"
#include "Encoding.h"
#include "FormatToken.h"
#include "FormatTokenLexer.h"
#include "TokenAnnotator.h"
#include "UnwrappedLineParser.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Format/Format.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Debug.h"
#include <type_traits>
#define DEBUG_TYPE "format-formatter"
namespace clang {
namespace format {
// FIXME: Instead of printing the diagnostic we should store it and have a
// better way to return errors through the format APIs.
class FatalDiagnosticConsumer : public DiagnosticConsumer {
public:
void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
const Diagnostic &Info) override {
if (DiagLevel == DiagnosticsEngine::Fatal) {
Fatal = true;
llvm::SmallVector<char, 128> Message;
Info.FormatDiagnostic(Message);
llvm::errs() << Message << "\n";
}
}
bool fatalError() const { return Fatal; }
private:
bool Fatal = false;
};
std::unique_ptr<Environment>
Environment::make(StringRef Code, StringRef FileName,
ArrayRef<tooling::Range> Ranges, unsigned FirstStartColumn,
unsigned NextStartColumn, unsigned LastStartColumn) {
auto Env = std::make_unique<Environment>(Code, FileName, FirstStartColumn,
NextStartColumn, LastStartColumn);
FatalDiagnosticConsumer Diags;
Env->SM.getDiagnostics().setClient(&Diags, /*ShouldOwnClient=*/false);
SourceLocation StartOfFile = Env->SM.getLocForStartOfFile(Env->ID);
for (const tooling::Range &Range : Ranges) {
SourceLocation Start = StartOfFile.getLocWithOffset(Range.getOffset());
SourceLocation End = Start.getLocWithOffset(Range.getLength());
Env->CharRanges.push_back(CharSourceRange::getCharRange(Start, End));
}
// Validate that we can get the buffer data without a fatal error.
Env->SM.getBufferData(Env->ID);
if (Diags.fatalError())
return nullptr;
return Env;
}
Environment::Environment(StringRef Code, StringRef FileName,
unsigned FirstStartColumn, unsigned NextStartColumn,
unsigned LastStartColumn)
: VirtualSM(new SourceManagerForFile(FileName, Code)), SM(VirtualSM->get()),
ID(VirtualSM->get().getMainFileID()), FirstStartColumn(FirstStartColumn),
NextStartColumn(NextStartColumn), LastStartColumn(LastStartColumn) {}
TokenAnalyzer::TokenAnalyzer(const Environment &Env, const FormatStyle &Style)
: Style(Style), Env(Env),
AffectedRangeMgr(Env.getSourceManager(), Env.getCharRanges()),
UnwrappedLines(1),
Encoding(encoding::detectEncoding(
Env.getSourceManager().getBufferData(Env.getFileID()))) {
LLVM_DEBUG(
llvm::dbgs() << "File encoding: "
<< (Encoding == encoding::Encoding_UTF8 ? "UTF8" : "unknown")
<< "\n");
LLVM_DEBUG(llvm::dbgs() << "Language: " << getLanguageName(Style.Language)
<< "\n");
}
std::pair<tooling::Replacements, unsigned> TokenAnalyzer::process() {
tooling::Replacements Result;
llvm::SpecificBumpPtrAllocator<FormatToken> Allocator;
IdentifierTable IdentTable(getFormattingLangOpts(Style));
FormatTokenLexer Lex(Env.getSourceManager(), Env.getFileID(),
Env.getFirstStartColumn(), Style, Encoding, Allocator,
IdentTable);
ArrayRef<FormatToken *> Toks(Lex.lex());
SmallVector<FormatToken *, 10> Tokens(Toks.begin(), Toks.end());
UnwrappedLineParser Parser(Style, Lex.getKeywords(),
Env.getFirstStartColumn(), Tokens, *this);
Parser.parse();
assert(UnwrappedLines.back().empty());
unsigned Penalty = 0;
for (unsigned Run = 0, RunE = UnwrappedLines.size(); Run + 1 != RunE; ++Run) {
const auto &Lines = UnwrappedLines[Run];
LLVM_DEBUG(llvm::dbgs() << "Run " << Run << "...\n");
SmallVector<AnnotatedLine *, 16> AnnotatedLines;
AnnotatedLines.reserve(Lines.size());
TokenAnnotator Annotator(Style, Lex.getKeywords());
for (const UnwrappedLine &Line : Lines) {
AnnotatedLines.push_back(new AnnotatedLine(Line));
Annotator.annotate(*AnnotatedLines.back());
}
std::pair<tooling::Replacements, unsigned> RunResult =
analyze(Annotator, AnnotatedLines, Lex);
LLVM_DEBUG({
llvm::dbgs() << "Replacements for run " << Run << ":\n";
for (const tooling::Replacement &Fix : RunResult.first)
llvm::dbgs() << Fix.toString() << "\n";
});
for (AnnotatedLine *Line : AnnotatedLines)
delete Line;
Penalty += RunResult.second;
for (const auto &R : RunResult.first) {
auto Err = Result.add(R);
// FIXME: better error handling here. For now, simply return an empty
// Replacements to indicate failure.
if (Err) {
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
return {tooling::Replacements(), 0};
}
}
}
return {Result, Penalty};
}
void TokenAnalyzer::consumeUnwrappedLine(const UnwrappedLine &TheLine) {
assert(!UnwrappedLines.empty());
UnwrappedLines.back().push_back(TheLine);
}
void TokenAnalyzer::finishRun() {
UnwrappedLines.push_back(SmallVector<UnwrappedLine, 16>());
}
} // end namespace format
} // end namespace clang
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