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55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
//===--- FuzzyStringMatcher.h - ---------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SOURCEKIT_LIB_SUPPORT_FUZZYSTRINGMATCHER_H
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#define LLVM_SOURCEKIT_LIB_SUPPORT_FUZZYSTRINGMATCHER_H
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#include "SourceKit/Core/LLVM.h"
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#include "llvm/ADT/BitVector.h"
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#include <string>
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namespace SourceKit {
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/// FuzzyStringMatcher compares candidate strings against a pattern
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/// string using a fuzzy matching algorithm and provides a numerical
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/// score for the match quality.
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///
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/// The inputs should be UTF8 strings, but the implementation is not currently
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/// unicode-correct in that no normalization or non-ASCII upper/lower casing is
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/// supported. Non-ASCII bytes in the input are treated as opaque.
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class FuzzyStringMatcher {
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std::string pattern;
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std::string lowercasePattern;
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double maxScore; ///< The maximum possible raw score for this pattern.
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/// If (and only if) c is in pattern, charactersInPattern[c] == 1
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llvm::BitVector charactersInPattern;
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public:
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bool normalize = false; ///< Whether to normalize scores to [0, 1].
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public:
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FuzzyStringMatcher(StringRef pattern);
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/// Whether \p candidate matches the pattern.
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///
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/// This operation is much simpler/faster than calculating
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/// the candidate's score.
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bool matchesCandidate(StringRef candidate) const;
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/// Calculates the numerical score for \p candidate.
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double scoreCandidate(StringRef candidate) const;
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};
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} // end namespace SourceKit
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#endif // LLVM_SOURCEKIT_LIB_SUPPORT_FUZZYSTRINGMATCHER_H
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