llvm/clang-tools-extra/clangd/index/dex/Token.h

//===--- Token.h - Symbol Search primitive ----------------------*- 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
/// Token objects represent a characteristic of a symbol, which can be used to
/// perform efficient search. Tokens are keys for inverted index which are
/// mapped to the corresponding posting lists.
///
/// The symbol std::cout might have the tokens:
/// * Scope "std::"
/// * Trigram "cou"
/// * Trigram "out"
/// * Type "std::ostream"
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_DEX_TOKEN_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_DEX_TOKEN_H

#include "llvm/ADT/Hashing.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
#include <vector>

namespace clang {
namespace clangd {
namespace dex {

/// A Token represents an attribute of a symbol, such as a particular trigram
/// present in the name (used for fuzzy search).
///
/// Tokens can be used to perform more sophisticated search queries by
/// constructing complex iterator trees.
class Token { … };

} // namespace dex
} // namespace clangd
} // namespace clang

namespace llvm {

// Support Tokens as DenseMap keys.
template <> struct DenseMapInfo<clang::clangd::dex::Token> { … };

} // namespace llvm

#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_DEX_TOKEN_H