1 /*
2  * Copyright 2011 Google Inc. All Rights Reserved.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef TYPOGRAPHY_FONT_SFNTLY_SRC_SAMPLE_SUBTLY_CHARACTER_PREDICATE_H_
18 #define TYPOGRAPHY_FONT_SFNTLY_SRC_SAMPLE_SUBTLY_CHARACTER_PREDICATE_H_
19 
20 #include "sfntly/port/refcount.h"
21 #include "sfntly/port/type.h"
22 
23 namespace subtly {
24 class CharacterPredicate : virtual public sfntly::RefCount {
25  public:
CharacterPredicate()26   CharacterPredicate() {}
~CharacterPredicate()27   virtual ~CharacterPredicate() {}
28   virtual bool operator()(int32_t character) const = 0;
29 };
30 
31 // All characters except for those between [start, end] are rejected
32 class AcceptRange : public CharacterPredicate,
33                     public sfntly::RefCounted<AcceptRange> {
34  public:
35   AcceptRange(int32_t start, int32_t end);
36   ~AcceptRange();
37   virtual bool operator()(int32_t character) const;
38 
39  private:
40   int32_t start_;
41   int32_t end_;
42 };
43 
44 // All characters in IntegerSet
45 // The set is OWNED by the predicate! Do not modify it.
46 // It will be freed when the predicate is destroyed.
47 class AcceptSet : public CharacterPredicate,
48                   public sfntly::RefCounted<AcceptSet> {
49  public:
50   explicit AcceptSet(sfntly::IntegerSet* characters);
51   ~AcceptSet();
52   virtual bool operator()(int32_t character) const;
53 
54  private:
55   sfntly::IntegerSet* characters_;
56 };
57 
58 // All characters
59 class AcceptAll : public CharacterPredicate,
60                   public sfntly::RefCounted<AcceptAll> {
61  public:
AcceptAll()62   AcceptAll() {}
~AcceptAll()63   ~AcceptAll() {}
64   virtual bool operator()(int32_t character) const;
65 };
66 }
67 
68 #endif  // TYPOGRAPHY_FONT_SFNTLY_SRC_SAMPLE_SUBTLY_CHARACTER_PREDICATE_H_
69