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 class raw_ostream; 24 25 /// StringMatcher - Given a list of strings and code to execute when they match, 26 /// output a simple switch tree to classify the input string. 27 /// 28 /// If a match is found, the code in Vals[i].second is executed; control must 29 /// not exit this code fragment. If nothing matches, execution falls through. 30 /// 31 class StringMatcher { 32 public: 33 typedef std::pair<std::string, std::string> StringPair; 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 : StrVariableName(strVariableName), Matches(matches), OS(os) {} 44 45 void Emit(unsigned Indent = 0) const; 46 47 private: 48 bool EmitStringMatcherForChar(const std::vector<const StringPair*> &Matches, 49 unsigned CharNo, unsigned IndentCount) const; 50 }; 51 52 } // end llvm namespace. 53 54 #endif 55
