C++ StringRef::equals_lower方法代码示例

static void handleHVXWarnings(const Driver &D, const ArgList &Args) {
  // Handle the unsupported values passed to mhvx-length.
  if (Arg *A = Args.getLastArg(options::OPT_mhexagon_hvx_length_EQ)) {
    StringRef Val = A->getValue();
    if (!Val.equals_lower("64b") && !Val.equals_lower("128b"))
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getOption().getName() << Val;
  }
}

// Check for header file extension.
// If the file extension is .h, .inc, or missing, it's
// assumed to be a header.
// \param FileName The file name.  Must not be a directory.
// \returns true if it has a header extension or no extension.
bool ModuleMapChecker::isHeader(StringRef FileName) {
  StringRef Extension = sys::path::extension(FileName);
  if (Extension.size() == 0)
    return false;
  if (Extension.equals_lower(".h"))
    return true;
  if (Extension.equals_lower(".inc"))
    return true;
  return false;
}

// Check for header file extension.
// If the file extension is .h, .inc, or missing, it's
// assumed to be a header.
// \param FileName The file name.  Must not be a directory.
// \returns true if it has a header extension or no extension.
bool ModularizeUtilities::isHeader(StringRef FileName) {
  StringRef Extension = llvm::sys::path::extension(FileName);
  if (Extension.size() == 0)
    return true;
  if (Extension.equals_lower(".h"))
    return true;
  if (Extension.equals_lower(".inc"))
    return true;
  return false;
}

StringRef HeaderMapImpl::lookupFilename(StringRef Filename,
                                        SmallVectorImpl<char> &DestPath) const {
  const HMapHeader &Hdr = getHeader();
  unsigned NumBuckets = getEndianAdjustedWord(Hdr.NumBuckets);

  // Don't probe infinitely.  This should be checked before constructing.
  assert(llvm::isPowerOf2_32(NumBuckets) && "Expected power of 2");

  // Linearly probe the hash table.
  for (unsigned Bucket = HashHMapKey(Filename);; ++Bucket) {
    HMapBucket B = getBucket(Bucket & (NumBuckets-1));
    if (B.Key == HMAP_EmptyBucketKey) return StringRef(); // Hash miss.

    // See if the key matches.  If not, probe on.
    Optional<StringRef> Key = getString(B.Key);
    if (LLVM_UNLIKELY(!Key))
      continue;
    if (!Filename.equals_lower(*Key))
      continue;

    // If so, we have a match in the hash table.  Construct the destination
    // path.
    Optional<StringRef> Prefix = getString(B.Prefix);
    Optional<StringRef> Suffix = getString(B.Suffix);

    DestPath.clear();
    if (LLVM_LIKELY(Prefix && Suffix)) {
      DestPath.append(Prefix->begin(), Prefix->end());
      DestPath.append(Suffix->begin(), Suffix->end());
    }
    return StringRef(DestPath.begin(), DestPath.size());
  }
}

StringRef HeaderMap::lookupFilename(StringRef Filename,
                                    SmallVectorImpl<char> &DestPath) const {
  const HMapHeader &Hdr = getHeader();
  unsigned NumBuckets = getEndianAdjustedWord(Hdr.NumBuckets);

  // If the number of buckets is not a power of two, the headermap is corrupt.
  // Don't probe infinitely.
  if (NumBuckets & (NumBuckets-1))
    return StringRef();

  // Linearly probe the hash table.
  for (unsigned Bucket = HashHMapKey(Filename);; ++Bucket) {
    HMapBucket B = getBucket(Bucket & (NumBuckets-1));
    if (B.Key == HMAP_EmptyBucketKey) return StringRef(); // Hash miss.

    // See if the key matches.  If not, probe on.
    if (!Filename.equals_lower(getString(B.Key)))
      continue;

    // If so, we have a match in the hash table.  Construct the destination
    // path.
    StringRef Prefix = getString(B.Prefix);
    StringRef Suffix = getString(B.Suffix);
    DestPath.clear();
    DestPath.append(Prefix.begin(), Prefix.end());
    DestPath.append(Suffix.begin(), Suffix.end());
    return StringRef(DestPath.begin(), DestPath.size());
  }
}

// Read the profile variant flag from the header: ":FE" means this is a FE
// generated profile. ":IR" means this is an IR level profile. Other strings
// with a leading ':' will be reported an error format.
std::error_code TextInstrProfReader::readHeader() {
  Symtab.reset(new InstrProfSymtab());
  bool IsIRInstr = false;
  if (!Line->startswith(":")) {
    IsIRLevelProfile = false;
    return success();
  }
  StringRef Str = (Line)->substr(1);
  if (Str.equals_lower("ir"))
    IsIRInstr = true;
  else if (Str.equals_lower("fe"))
    IsIRInstr = false;
  else
    return instrprof_error::bad_header;

  ++Line;
  IsIRLevelProfile = IsIRInstr;
  return success();
}

/// Match a word within a name to a word within a type.
static bool matchNameWordToTypeWord(StringRef nameWord, StringRef typeWord) {
  // If the name word is longer, there's no match.
  if (nameWord.size() > typeWord.size()) return false;

  // If the name word is shorter, try for a partial match.
  if (nameWord.size() < typeWord.size()) {
    // We can match the suffix of the type so long as everything preceding the
    // match is neither a lowercase letter nor a '_'. This ignores type
    // prefixes for acronyms, e.g., the 'NS' in 'NSURL'.
    if (typeWord.endswith_lower(nameWord) && 
        !clang::isLowercase(typeWord[typeWord.size()-nameWord.size()])) {
      // Check that everything preceding the match is neither a lowercase letter
      // nor a '_'.
      for (unsigned i = 0, n = nameWord.size(); i != n; ++i) {
        if (clang::isLowercase(typeWord[i]) || typeWord[i] == '_') return false;
      }

      return true;
    }

    // We can match a prefix so long as everything following the match is
    // a number.
    if (typeWord.startswith_lower(nameWord)) {
      for (unsigned i = nameWord.size(), n = typeWord.size(); i != n; ++i) {
        if (!clang::isDigit(typeWord[i])) return false;
      }

      return true;
    }

    return false;
  }

  // Check for an exact match.
  return nameWord.equals_lower(typeWord);
}

 virtual bool equivalent(StringRef FileA, StringRef FileB) const {
   return FileA.equals_lower(FileB);
 }

FormatStyle getStyle(StringRef StyleName, StringRef FileName) {
  FormatStyle Style;
  getPredefinedStyle(FallbackStyle, &Style);

  if (StyleName.startswith("{")) {
    // Parse YAML/JSON style from the command line.
    if (error_code ec = parseConfiguration(StyleName, &Style)) {
      llvm::errs() << "Error parsing -style: " << ec.message()
                   << ", using " << FallbackStyle << " style\n";
    }
    return Style;
  }

  if (!StyleName.equals_lower("file")) {
    if (!getPredefinedStyle(StyleName, &Style))
      llvm::errs() << "Invalid value for -style, using " << FallbackStyle
                   << " style\n";
    return Style;
  }

  if (FileName == "-")
    FileName = AssumeFilename;
  SmallString<128> Path(FileName);
  llvm::sys::fs::make_absolute(Path);
  for (StringRef Directory = Path;
       !Directory.empty();
       Directory = llvm::sys::path::parent_path(Directory)) {
    if (!llvm::sys::fs::is_directory(Directory))
      continue;
    SmallString<128> ConfigFile(Directory);

    llvm::sys::path::append(ConfigFile, ".clang-format");
    DEBUG(llvm::dbgs() << "Trying " << ConfigFile << "...\n");
    bool IsFile = false;
    // Ignore errors from is_regular_file: we only need to know if we can read
    // the file or not.
    llvm::sys::fs::is_regular_file(Twine(ConfigFile), IsFile);

    if (!IsFile) {
      // Try _clang-format too, since dotfiles are not commonly used on Windows.
      ConfigFile = Directory;
      llvm::sys::path::append(ConfigFile, "_clang-format");
      DEBUG(llvm::dbgs() << "Trying " << ConfigFile << "...\n");
      llvm::sys::fs::is_regular_file(Twine(ConfigFile), IsFile);
    }

    if (IsFile) {
      OwningPtr<MemoryBuffer> Text;
      if (error_code ec = MemoryBuffer::getFile(ConfigFile, Text)) {
        llvm::errs() << ec.message() << "\n";
        continue;
      }
      if (error_code ec = parseConfiguration(Text->getBuffer(), &Style)) {
        llvm::errs() << "Error reading " << ConfigFile << ": " << ec.message()
                     << "\n";
        continue;
      }
      DEBUG(llvm::dbgs() << "Using configuration file " << ConfigFile << "\n");
      return Style;
    }
  }
  llvm::errs() << "Can't find usable .clang-format, using " << FallbackStyle
               << " style\n";
  return Style;
}