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comparison clang-tools-extra/clang-include-fixer/FuzzySymbolIndex.h @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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147:c2174574ed3a 150:1d019706d866
1 //===--- FuzzySymbolIndex.h - Lookup symbols for autocomplete ---*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef LLVM_CLANG_TOOLS_EXTRA_INCLUDE_FIXER_FUZZY_SYMBOL_INDEX_H
10 #define LLVM_CLANG_TOOLS_EXTRA_INCLUDE_FIXER_FUZZY_SYMBOL_INDEX_H
11
12 #include "SymbolIndex.h"
13 #include "find-all-symbols/SymbolInfo.h"
14 #include "llvm/ADT/SmallString.h"
15 #include "llvm/ADT/StringRef.h"
16 #include "llvm/Support/Error.h"
17 #include <string>
18 #include <vector>
19
20 namespace clang {
21 namespace include_fixer {
22
23 // A FuzzySymbolIndex retrieves top-level symbols matching a query string.
24 //
25 // It refines the contract of SymbolIndex::search to do fuzzy matching:
26 // - symbol names are tokenized: "unique ptr", "string ref".
27 // - query must match prefixes of symbol tokens: [upt]
28 // - if the query has multiple tokens, splits must match: [StR], not [STr].
29 // Helpers for tokenization and regex matching are provided.
30 //
31 // Implementations may choose to truncate results, refuse short queries, etc.
32 class FuzzySymbolIndex : public SymbolIndex {
33 public:
34 // Loads the specified clang-include-fixer database and returns an index serving it.
35 static llvm::Expected<std::unique_ptr<FuzzySymbolIndex>>
36 createFromYAML(llvm::StringRef File);
37
38 // Helpers for implementing indexes:
39
40 // Transforms a symbol name or query into a sequence of tokens.
41 // - URLHandlerCallback --> [url, handler, callback]
42 // - snake_case11 --> [snake, case, 11]
43 // - _WTF$ --> [wtf]
44 static std::vector<std::string> tokenize(llvm::StringRef Text);
45
46 // Transforms query tokens into an unanchored regexp to match symbol tokens.
47 // - [fe f] --> /f(\w* )?e\w* f/, matches [fee fie foe].
48 static std::string queryRegexp(const std::vector<std::string> &Tokens);
49 };
50
51 } // namespace include_fixer
52 } // namespace clang
53
54 #endif // LLVM_CLANG_TOOLS_EXTRA_INCLUDE_FIXER_FUZZY_SYMBOL_INDEX_H