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//===- split-file.cpp - Input splitting utility ---------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Split input into multipe parts separated by regex '^(.|//)--- ' and extract
// the specified part.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
#include <string>
#include <system_error>
using namespace llvm;
static cl::OptionCategory cat("split-file Options");
static cl::opt<std::string> input(cl::Positional, cl::desc("filename"),
cl::cat(cat));
static cl::opt<std::string> output(cl::Positional, cl::desc("directory"),
cl::value_desc("directory"), cl::cat(cat));
static cl::opt<bool> leadingLines("leading-lines",
cl::desc("Preserve line numbers"),
cl::cat(cat));
static cl::opt<bool> noLeadingLines("no-leading-lines",
cl::desc("Don't preserve line numbers (default)"),
cl::cat(cat));
static StringRef toolName;
static int errorCount;
[[noreturn]] static void fatal(StringRef filename, const Twine &message) {
if (filename.empty())
WithColor::error(errs(), toolName) << message << '\n';
else
WithColor::error(errs(), toolName) << filename << ": " << message << '\n';
exit(1);
}
static void error(StringRef filename, int64_t line, const Twine &message) {
++errorCount;
errs() << filename << ':' << line << ": ";
WithColor::error(errs()) << message << '\n';
}
namespace {
struct Part {
const char *begin = nullptr;
const char *end = nullptr;
int64_t leadingLines = 0;
};
} // namespace
static int handle(MemoryBuffer &inputBuf, StringRef input) {
DenseMap<StringRef, Part> partToBegin;
StringRef lastPart, separator;
StringRef EOL = inputBuf.getBuffer().detectEOL();
for (line_iterator i(inputBuf, /*SkipBlanks=*/false, '\0'); !i.is_at_eof();) {
const int64_t lineNo = i.line_number();
const StringRef line = *i++;
const size_t markerLen = line.startswith("//") ? 6 : 5;
if (!(line.size() >= markerLen &&
line.substr(markerLen - 4).startswith("--- ")))
continue;
separator = line.substr(0, markerLen);
const StringRef partName = line.substr(markerLen);
if (partName.empty()) {
error(input, lineNo, "empty part name");
continue;
}
if (isSpace(partName.front()) || isSpace(partName.back())) {
error(input, lineNo, "part name cannot have leading or trailing space");
continue;
}
auto res = partToBegin.try_emplace(partName);
if (!res.second) {
error(input, lineNo,
"'" + separator + partName + "' occurs more than once");
continue;
}
if (!lastPart.empty())
partToBegin[lastPart].end = line.data();
Part &cur = res.first->second;
if (!i.is_at_eof())
cur.begin = i->data();
// If --leading-lines is specified, numEmptyLines is 0. Append newlines so
// that the extracted part preserves line numbers.
cur.leadingLines = leadingLines ? i.line_number() - 1 : 0;
lastPart = partName;
}
if (lastPart.empty())
fatal(input, "no part separator was found");
if (errorCount)
return 1;
partToBegin[lastPart].end = inputBuf.getBufferEnd();
std::vector<std::unique_ptr<ToolOutputFile>> outputFiles;
SmallString<256> partPath;
for (auto &keyValue : partToBegin) {
partPath.clear();
sys::path::append(partPath, output, keyValue.first);
std::error_code ec =
sys::fs::create_directories(sys::path::parent_path(partPath));
if (ec)
fatal(input, ec.message());
auto f = std::make_unique<ToolOutputFile>(partPath.str(), ec,
llvm::sys::fs::OF_None);
if (!f)
fatal(input, ec.message());
Part &part = keyValue.second;
for (int64_t i = 0; i != part.leadingLines; ++i)
(*f).os() << EOL;
if (part.begin)
(*f).os().write(part.begin, part.end - part.begin);
outputFiles.push_back(std::move(f));
}
for (std::unique_ptr<ToolOutputFile> &outputFile : outputFiles)
outputFile->keep();
return 0;
}
int main(int argc, const char **argv) {
toolName = sys::path::stem(argv[0]);
cl::HideUnrelatedOptions({&cat});
cl::ParseCommandLineOptions(
argc, argv,
"Split input into multiple parts separated by regex '^(.|//)--- ' and "
"extract the part specified by '^(.|//)--- <part>'\n",
nullptr,
/*EnvVar=*/nullptr,
/*LongOptionsUseDoubleDash=*/true);
if (input.empty())
fatal("", "input filename is not specified");
if (output.empty())
fatal("", "output directory is not specified");
ErrorOr<std::unique_ptr<MemoryBuffer>> bufferOrErr =
MemoryBuffer::getFileOrSTDIN(input);
if (std::error_code ec = bufferOrErr.getError())
fatal(input, ec.message());
// Delete output if it is a file or an empty directory, so that we can create
// a directory.
sys::fs::file_status status;
if (std::error_code ec = sys::fs::status(output, status))
if (ec.value() != static_cast<int>(std::errc::no_such_file_or_directory))
fatal(output, ec.message());
if (status.type() != sys::fs::file_type::file_not_found &&
status.type() != sys::fs::file_type::directory_file &&
status.type() != sys::fs::file_type::regular_file)
fatal(output, "output cannot be a special file");
if (std::error_code ec = sys::fs::remove(output, /*IgnoreNonExisting=*/true))
if (ec.value() != static_cast<int>(std::errc::directory_not_empty) &&
ec.value() != static_cast<int>(std::errc::file_exists))
fatal(output, ec.message());
return handle(**bufferOrErr, input);
}
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