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       1             : //===- StringMatcher.h - Generate a matcher for input strings ---*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file implements the StringMatcher class.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #ifndef LLVM_TABLEGEN_STRINGMATCHER_H
      15             : #define LLVM_TABLEGEN_STRINGMATCHER_H
      16             : 
      17             : #include "llvm/ADT/StringRef.h"
      18             : #include <string>
      19             : #include <utility>
      20             : #include <vector>
      21             : 
      22             : namespace llvm {
      23             : 
      24             : class raw_ostream;
      25             : 
      26             : /// Given a list of strings and code to execute when they match, output a
      27             : /// simple switch tree to classify the input string.
      28             : ///
      29             : /// If a match is found, the code in Matches[i].second is executed; control must
      30             : /// not exit this code fragment.  If nothing matches, execution falls through.
      31             : class StringMatcher {
      32             : public:
      33             :   using StringPair = std::pair<std::string, std::string>;
      34             : 
      35             : private:
      36             :   StringRef StrVariableName;
      37             :   const std::vector<StringPair> &Matches;
      38             :   raw_ostream &OS;
      39             : 
      40             : public:
      41             :   StringMatcher(StringRef strVariableName,
      42             :                 const std::vector<StringPair> &matches, raw_ostream &os)
      43          35 :     : StrVariableName(strVariableName), Matches(matches), OS(os) {}
      44             : 
      45             :   void Emit(unsigned Indent = 0, bool IgnoreDuplicates = false) const;
      46             : 
      47             : private:
      48             :   bool EmitStringMatcherForChar(const std::vector<const StringPair *> &Matches,
      49             :                                 unsigned CharNo, unsigned IndentCount,
      50             :                                 bool IgnoreDuplicates) const;
      51             : };
      52             : 
      53             : } // end namespace llvm
      54             : 
      55             : #endif // LLVM_TABLEGEN_STRINGMATCHER_H