1 | //===- StringMatcher.h - Generate a matcher for input strings ---*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file implements the StringMatcher class. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #ifndef LLVM_TABLEGEN_STRINGMATCHER_H |
14 | #define LLVM_TABLEGEN_STRINGMATCHER_H |
15 | |
16 | #include "llvm/ADT/StringRef.h" |
17 | #include <string> |
18 | #include <utility> |
19 | #include <vector> |
20 | |
21 | namespace llvm { |
22 | |
23 | class raw_ostream; |
24 | |
25 | /// Given a list of strings and code to execute when they match, output a |
26 | /// simple switch tree to classify the input string. |
27 | /// |
28 | /// If a match is found, the code in Matches[i].second is executed; control must |
29 | /// not exit this code fragment. If nothing matches, execution falls through. |
30 | class StringMatcher { |
31 | public: |
32 | using StringPair = std::pair<std::string, std::string>; |
33 | |
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, bool IgnoreDuplicates = false) const; |
45 | |
46 | private: |
47 | bool EmitStringMatcherForChar(const std::vector<const StringPair *> &Matches, |
48 | unsigned CharNo, unsigned IndentCount, |
49 | bool IgnoreDuplicates) const; |
50 | }; |
51 | |
52 | } // end namespace llvm |
53 | |
54 | #endif // LLVM_TABLEGEN_STRINGMATCHER_H |
55 | |