Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===-- GlobPattern.h - glob pattern matcher implementation -*- 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

//

//===----------------------------------------------------------------------===//

//

// This file implements a glob pattern matcher. The glob pattern is the

// rule used by the shell.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_GLOBPATTERN_H

#define LLVM_SUPPORT_GLOBPATTERN_H

#include "llvm/ADT/BitVector.h"

#include "llvm/Support/Error.h"

#include <optional>

#include <vector>

// This class represents a glob pattern. Supported metacharacters

// are "*", "?", "\", "[<chars>]", "[^<chars>]", and "[!<chars>]".

namespace llvm {

template <typename T> class ArrayRef;

class StringRef;

class GlobPattern {

public:

  static Expected<GlobPattern> create(StringRef Pat);

  bool match(StringRef S) const;

  // Returns true for glob pattern "*". Can be used to avoid expensive

  // preparation/acquisition of the input for match().

  bool isTrivialMatchAll() const {

    if (Prefix && Prefix->empty()) {

      assert(!Suffix);

      return true;

    }

    return false;

  }

private:

  bool matchOne(ArrayRef<BitVector> Pat, StringRef S) const;

  // Parsed glob pattern.

  std::vector<BitVector> Tokens;

  // The following members are for optimization.

  std::optional<StringRef> Exact;

  std::optional<StringRef> Prefix;

  std::optional<StringRef> Suffix;

};

}

#endif // LLVM_SUPPORT_GLOBPATTERN_H