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
22namespace 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///
31class StringMatcher {
32public:
33  typedef std::pair<std::string, std::string> StringPair;
34
35private:
36  StringRef StrVariableName;
37  const std::vector<StringPair> &Matches;
38  raw_ostream &OS;
39
40public:
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
47private:
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