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      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:
     26   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:
     62   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