utils/TableGen/StringMatcher.h

   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 STRINGMATCHER_H
  15 #define STRINGMATCHER_H
  16
  17 #include <vector>
  18 #include <string>
  19 #include <utility>
  20 #include "llvm/ADT/StringRef.h"
  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 private:
  35   StringRef StrVariableName;
  36   const std::vector<StringPair> &Matches;
  37   raw_ostream &OS;
  38
  39 public:
  40   StringMatcher(StringRef strVariableName,
  41                 const std::vector<StringPair> &matches, raw_ostream &os)
  42     : StrVariableName(strVariableName), Matches(matches), OS(os) {}
  43
  44   void Emit(unsigned Indent = 0) const;
  45
  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