TokenAnalyzer.cpp
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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/Support/Debug.h"
#define DEBUG_TYPE "format-formatter"
namespace clang {
namespace format {
Environment::Environment(StringRef Code, StringRef FileName,
ArrayRef<tooling::Range> Ranges,
unsigned FirstStartColumn, unsigned NextStartColumn,
unsigned LastStartColumn)
: VirtualSM(new SourceManagerForFile(FileName, Code)), SM(VirtualSM->get()),
ID(VirtualSM->get().getMainFileID()), FirstStartColumn(FirstStartColumn),
NextStartColumn(NextStartColumn), LastStartColumn(LastStartColumn) {
SourceLocation StartOfFile = SM.getLocForStartOfFile(ID);
for (const tooling::Range &Range : Ranges) {
SourceLocation Start = StartOfFile.getLocWithOffset(Range.getOffset());
SourceLocation End = Start.getLocWithOffset(Range.getLength());
CharRanges.push_back(CharSourceRange::getCharRange(Start, End));
}
}
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.rbegin()->empty());
unsigned Penalty = 0;
for (unsigned Run = 0, RunE = UnwrappedLines.size(); Run + 1 != RunE; ++Run) {
LLVM_DEBUG(llvm::dbgs() << "Run " << Run << "...\n");
SmallVector<AnnotatedLine *, 16> AnnotatedLines;
TokenAnnotator Annotator(Style, Lex.getKeywords());
for (unsigned i = 0, e = UnwrappedLines[Run].size(); i != e; ++i) {
AnnotatedLines.push_back(new AnnotatedLine(UnwrappedLines[Run][i]));
Annotator.annotate(*AnnotatedLines.back());
}
std::pair<tooling::Replacements, unsigned> RunResult =
analyze(Annotator, AnnotatedLines, Lex);
LLVM_DEBUG({
llvm::dbgs() << "Replacements for run " << Run << ":\n";
for (tooling::Replacements::const_iterator I = RunResult.first.begin(),
E = RunResult.first.end();
I != E; ++I) {
llvm::dbgs() << I->toString() << "\n";
}
});
for (unsigned i = 0, e = AnnotatedLines.size(); i != e; ++i) {
delete AnnotatedLines[i];
}
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