1 /*
2 *******************************************************************************
3 * Copyright (C) 1997-2014, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 *******************************************************************************
6 */
7 
8 #ifndef NFRULE_H
9 #define NFRULE_H
10 
11 #include "unicode/rbnf.h"
12 
13 #if U_HAVE_RBNF
14 
15 #include "unicode/utypes.h"
16 #include "unicode/uobject.h"
17 #include "unicode/unistr.h"
18 #include "putilimp.h"
19 
20 U_NAMESPACE_BEGIN
21 
22 class FieldPosition;
23 class Formattable;
24 class NFRuleList;
25 class NFRuleSet;
26 class NFSubstitution;
27 class ParsePosition;
28 class PluralFormat;
29 class RuleBasedNumberFormat;
30 class UnicodeString;
31 
32 class NFRule : public UMemory {
33 public:
34 
35     enum ERuleType {
36         kNoBase = 0,
37         kNegativeNumberRule = -1,
38         kImproperFractionRule = -2,
39         kProperFractionRule = -3,
40         kMasterRule = -4,
41         kOtherRule = -5
42     };
43 
44     static void makeRules(UnicodeString& definition,
45                           const NFRuleSet* ruleSet,
46                           const NFRule* predecessor,
47                           const RuleBasedNumberFormat* rbnf,
48                           NFRuleList& ruleList,
49                           UErrorCode& status);
50 
51     NFRule(const RuleBasedNumberFormat* rbnf);
52     ~NFRule();
53 
54     UBool operator==(const NFRule& rhs) const;
55     UBool operator!=(const NFRule& rhs) const { return !operator==(rhs); }
56 
getType()57     ERuleType getType() const { return (ERuleType)(baseValue <= kNoBase ? (ERuleType)baseValue : kOtherRule); }
setType(ERuleType ruleType)58     void setType(ERuleType ruleType) { baseValue = (int32_t)ruleType; }
59 
getBaseValue()60     int64_t getBaseValue() const { return baseValue; }
61     void setBaseValue(int64_t value, UErrorCode& status);
62 
getDivisor()63     double getDivisor() const { return uprv_pow(radix, exponent); }
64 
65     void doFormat(int64_t number, UnicodeString& toAppendTo, int32_t pos, UErrorCode& status) const;
66     void doFormat(double  number, UnicodeString& toAppendTo, int32_t pos, UErrorCode& status) const;
67 
68     UBool doParse(const UnicodeString& text,
69                   ParsePosition& pos,
70                   UBool isFractional,
71                   double upperBound,
72                   Formattable& result) const;
73 
74     UBool shouldRollBack(double number) const;
75 
76     void _appendRuleText(UnicodeString& result) const;
77 
78     int32_t findTextLenient(const UnicodeString& str, const UnicodeString& key,
79                      int32_t startingAt, int32_t* resultCount) const;
80 
81 private:
82     void parseRuleDescriptor(UnicodeString& descriptor, UErrorCode& status);
83     void extractSubstitutions(const NFRuleSet* ruleSet, const UnicodeString &ruleText, const NFRule* predecessor, UErrorCode& status);
84     NFSubstitution* extractSubstitution(const NFRuleSet* ruleSet, const NFRule* predecessor, UErrorCode& status);
85 
86     int16_t expectedExponent() const;
87     int32_t indexOfAny(const UChar* const strings[]) const;
88     double matchToDelimiter(const UnicodeString& text, int32_t startPos, double baseValue,
89                             const UnicodeString& delimiter, ParsePosition& pp, const NFSubstitution* sub,
90                             double upperBound) const;
91     void stripPrefix(UnicodeString& text, const UnicodeString& prefix, ParsePosition& pp) const;
92 
93     int32_t prefixLength(const UnicodeString& str, const UnicodeString& prefix, UErrorCode& status) const;
94     UBool allIgnorable(const UnicodeString& str, UErrorCode& status) const;
95     int32_t findText(const UnicodeString& str, const UnicodeString& key,
96                      int32_t startingAt, int32_t* resultCount) const;
97 
98 private:
99     int64_t baseValue;
100     int32_t radix;
101     int16_t exponent;
102     UnicodeString ruleText;
103     NFSubstitution* sub1;
104     NFSubstitution* sub2;
105     const RuleBasedNumberFormat* formatter;
106     const PluralFormat* rulePatternFormat;
107 
108     NFRule(const NFRule &other); // forbid copying of this class
109     NFRule &operator=(const NFRule &other); // forbid copying of this class
110 };
111 
112 U_NAMESPACE_END
113 
114 /* U_HAVE_RBNF */
115 #endif
116 
117 // NFRULE_H
118 #endif
119 
120