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 /// StringMatcher - Given a list of strings and code to execute when they match, 27 /// output a simple switch tree to classify the input string. 28 /// 29 /// If a match is found, the code in Vals[i].second is executed; control must 30 /// not exit this code fragment. If nothing matches, execution falls through. 31 /// 32 class StringMatcher { 33 public: 34 using StringPair = std::pair<std::string, std::string>; 35 36 private: 37 StringRef StrVariableName; 38 const std::vector<StringPair> &Matches; 39 raw_ostream &OS; 40 41 public: 42 StringMatcher(StringRef strVariableName, 43 const std::vector<StringPair> &matches, raw_ostream &os) 44 : StrVariableName(strVariableName), Matches(matches), OS(os) {} 45 46 void Emit(unsigned Indent = 0) const; 47 48 private: 49 bool EmitStringMatcherForChar(const std::vector<const StringPair*> &Matches, 50 unsigned CharNo, unsigned IndentCount) const; 51 }; 52 53 } // end namespace llvm 54 55 #endif // LLVM_TABLEGEN_STRINGMATCHER_H 56
