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//===- StringMatcher.h - Generate a matcher for input strings ---*- 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 the StringMatcher class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TABLEGEN_STRINGMATCHER_H
#define LLVM_TABLEGEN_STRINGMATCHER_H
#include "llvm/ADT/StringRef.h"
#include <string>
#include <utility>
#include <vector>
namespace llvm {
class raw_ostream;
/// Given a list of strings and code to execute when they match, output a
/// simple switch tree to classify the input string.
///
/// If a match is found, the code in Matches[i].second is executed; control must
/// not exit this code fragment. If nothing matches, execution falls through.
class StringMatcher {
public:
using StringPair = std::pair<std::string, std::string>;
private:
StringRef StrVariableName;
const std::vector<StringPair> &Matches;
raw_ostream &OS;
public:
StringMatcher(StringRef strVariableName,
const std::vector<StringPair> &matches, raw_ostream &os)
: StrVariableName(strVariableName), Matches(matches), OS(os) {}
void Emit(unsigned Indent = 0, bool IgnoreDuplicates = false) const;
private:
bool EmitStringMatcherForChar(const std::vector<const StringPair *> &Matches,
unsigned CharNo, unsigned IndentCount,
bool IgnoreDuplicates) const;
};
} // end namespace llvm
#endif // LLVM_TABLEGEN_STRINGMATCHER_H
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