llvm/llvm/include/llvm/Support/GlobPattern.h

//===-- 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.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_GLOBPATTERN_H
#define LLVM_SUPPORT_GLOBPATTERN_H

#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Error.h"
#include <optional>

namespace llvm {

/// This class implements a glob pattern matcher similar to the one found in
/// bash, but with some key differences. Namely, that \p "*" matches all
/// characters and does not exclude path separators.
///
/// * \p "?" matches a single character.
/// * \p "*" matches zero or more characters.
/// * \p "[<chars>]" matches one character in the bracket. Character ranges,
///   e.g., \p "[a-z]", and negative sets via \p "[^ab]" or \p "[!ab]" are also
///   supported.
/// * \p "{<glob>,...}" matches one of the globs in the list. Nested brace
///   expansions are not supported. If \p MaxSubPatterns is empty then
///   brace expansions are not supported and characters \p "{,}" are treated as
///   literals.
/// * \p "\\" (a single backslash) escapes the next character so it is treated
///   as a literal.
///
/// Some known edge cases are:
/// * \p "]" is allowed as the first character in a character class, i.e.,
///   \p "[]]" is valid and matches the literal \p "]".
/// * The empty character class, i.e., \p "[]", is invalid.
/// * Empty or singleton brace expansions, e.g., \p "{}", \p "{a}", are invalid.
/// * \p "}" and \p "," that are not inside a brace expansion are taken as
///   literals, e.g., \p ",}" is valid but \p "{" is not.
///
/// For example, \p "*[/\\\\]foo.{c,cpp}" (with two backslashes) will match
/// (unix or windows) paths to all files named \p "foo.c" or \p "foo.cpp".
class GlobPattern { … };
}

#endif // LLVM_SUPPORT_GLOBPATTERN_H