1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2009-2015, International Business Machines Corporation and    *
6 * others. All Rights Reserved.                                                *
7 *******************************************************************************
8 */
9 
10 #ifndef FPHDLIMP_H
11 #define FPHDLIMP_H
12 
13 #include "unicode/utypes.h"
14 
15 #if !UCONFIG_NO_FORMATTING
16 
17 #include "unicode/fieldpos.h"
18 #include "unicode/fpositer.h"
19 #include "unicode/formattedvalue.h"
20 
21 U_NAMESPACE_BEGIN
22 
23 // utility FieldPositionHandler
24 // base class, null implementation
25 
26 class U_I18N_API FieldPositionHandler: public UMemory {
27  protected:
28   int32_t fShift = 0;
29 
30  public:
31   virtual ~FieldPositionHandler();
32   virtual void addAttribute(int32_t id, int32_t start, int32_t limit) = 0;
33   virtual void shiftLast(int32_t delta) = 0;
34   virtual UBool isRecording(void) const = 0;
35 
36   void setShift(int32_t delta);
37 };
38 
39 
40 // utility subclass FieldPositionOnlyHandler
41 
42 class FieldPositionOnlyHandler : public FieldPositionHandler {
43   FieldPosition& pos;
44   UBool acceptFirstOnly = FALSE;
45   UBool seenFirst = FALSE;
46 
47  public:
48   FieldPositionOnlyHandler(FieldPosition& pos);
49   virtual ~FieldPositionOnlyHandler();
50 
51   void addAttribute(int32_t id, int32_t start, int32_t limit) U_OVERRIDE;
52   void shiftLast(int32_t delta) U_OVERRIDE;
53   UBool isRecording(void) const U_OVERRIDE;
54 
55   /**
56    * Enable this option to lock in the FieldPosition value after seeing the
57    * first occurrence of the field. The default behavior is to take the last
58    * occurrence.
59    */
60   void setAcceptFirstOnly(UBool acceptFirstOnly);
61 };
62 
63 
64 // utility subclass FieldPositionIteratorHandler
65 
66 class FieldPositionIteratorHandler : public FieldPositionHandler {
67   FieldPositionIterator* iter; // can be NULL
68   UVector32* vec;
69   UErrorCode status;
70   UFieldCategory fCategory;
71 
72   // Note, we keep a reference to status, so if status is on the stack, we have
73   // to be destroyed before status goes out of scope.  Easiest thing is to
74   // allocate us on the stack in the same (or narrower) scope as status has.
75   // This attempts to encourage that by blocking heap allocation.
76   static void* U_EXPORT2 operator new(size_t) U_NOEXCEPT = delete;
77   static void* U_EXPORT2 operator new[](size_t) U_NOEXCEPT = delete;
78 #if U_HAVE_PLACEMENT_NEW
79   static void* U_EXPORT2 operator new(size_t, void*) U_NOEXCEPT = delete;
80 #endif
81 
82  public:
83   FieldPositionIteratorHandler(FieldPositionIterator* posIter, UErrorCode& status);
84   /** If using this constructor, you must call getError() when done formatting! */
85   FieldPositionIteratorHandler(UVector32* vec, UErrorCode& status);
86   ~FieldPositionIteratorHandler();
87 
88   void addAttribute(int32_t id, int32_t start, int32_t limit) U_OVERRIDE;
89   void shiftLast(int32_t delta) U_OVERRIDE;
90   UBool isRecording(void) const U_OVERRIDE;
91 
92   /** Copies a failed error code into _status. */
getError(UErrorCode & _status)93   inline void getError(UErrorCode& _status) {
94     if (U_SUCCESS(_status) && U_FAILURE(status)) {
95       _status = status;
96     }
97   }
98 
setCategory(UFieldCategory category)99   inline void setCategory(UFieldCategory category) {
100     fCategory = category;
101   }
102 };
103 
104 U_NAMESPACE_END
105 
106 #endif /* !UCONFIG_NO_FORMATTING */
107 
108 #endif /* FPHDLIMP_H */
109