1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 1997-2015, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 */
9 
10 #ifndef NFRULE_H
11 #define NFRULE_H
12 
13 #include "unicode/rbnf.h"
14 
15 #if U_HAVE_RBNF
16 
17 #include "unicode/utypes.h"
18 #include "unicode/uobject.h"
19 #include "unicode/unistr.h"
20 
21 U_NAMESPACE_BEGIN
22 
23 class FieldPosition;
24 class Formattable;
25 class NFRuleList;
26 class NFRuleSet;
27 class NFSubstitution;
28 class ParsePosition;
29 class PluralFormat;
30 class RuleBasedNumberFormat;
31 class UnicodeString;
32 
33 class NFRule : public UMemory {
34 public:
35 
36     enum ERuleType {
37         kNoBase = 0,
38         kNegativeNumberRule = -1,
39         kImproperFractionRule = -2,
40         kProperFractionRule = -3,
41         kMasterRule = -4,
42         kInfinityRule = -5,
43         kNaNRule = -6,
44         kOtherRule = -7
45     };
46 
47     static void makeRules(UnicodeString& definition,
48                           NFRuleSet* ruleSet,
49                           const NFRule* predecessor,
50                           const RuleBasedNumberFormat* rbnf,
51                           NFRuleList& ruleList,
52                           UErrorCode& status);
53 
54     NFRule(const RuleBasedNumberFormat* rbnf, const UnicodeString &ruleText, UErrorCode &status);
55     ~NFRule();
56 
57     UBool operator==(const NFRule& rhs) const;
58     UBool operator!=(const NFRule& rhs) const { return !operator==(rhs); }
59 
getType()60     ERuleType getType() const { return (ERuleType)(baseValue <= kNoBase ? (ERuleType)baseValue : kOtherRule); }
setType(ERuleType ruleType)61     void setType(ERuleType ruleType) { baseValue = (int32_t)ruleType; }
62 
getBaseValue()63     int64_t getBaseValue() const { return baseValue; }
64     void setBaseValue(int64_t value, UErrorCode& status);
65 
getDecimalPoint()66     UChar getDecimalPoint() const { return decimalPoint; }
67 
68     int64_t getDivisor() const;
69 
70     void doFormat(int64_t number, UnicodeString& toAppendTo, int32_t pos, int32_t recursionCount, UErrorCode& status) const;
71     void doFormat(double  number, UnicodeString& toAppendTo, int32_t pos, int32_t recursionCount, UErrorCode& status) const;
72 
73     UBool doParse(const UnicodeString& text,
74                   ParsePosition& pos,
75                   UBool isFractional,
76                   double upperBound,
77                   Formattable& result) const;
78 
79     UBool shouldRollBack(int64_t number) const;
80 
81     void _appendRuleText(UnicodeString& result) const;
82 
83     int32_t findTextLenient(const UnicodeString& str, const UnicodeString& key,
84                      int32_t startingAt, int32_t* resultCount) const;
85 
86     void setDecimalFormatSymbols(const DecimalFormatSymbols &newSymbols, UErrorCode& status);
87 
88 private:
89     void parseRuleDescriptor(UnicodeString& descriptor, UErrorCode& status);
90     void extractSubstitutions(const NFRuleSet* ruleSet, const UnicodeString &ruleText, const NFRule* predecessor, UErrorCode& status);
91     NFSubstitution* extractSubstitution(const NFRuleSet* ruleSet, const NFRule* predecessor, UErrorCode& status);
92 
93     int16_t expectedExponent() const;
94     int32_t indexOfAnyRulePrefix() const;
95     double matchToDelimiter(const UnicodeString& text, int32_t startPos, double baseValue,
96                             const UnicodeString& delimiter, ParsePosition& pp, const NFSubstitution* sub,
97                             double upperBound) const;
98     void stripPrefix(UnicodeString& text, const UnicodeString& prefix, ParsePosition& pp) const;
99 
100     int32_t prefixLength(const UnicodeString& str, const UnicodeString& prefix, UErrorCode& status) const;
101     UBool allIgnorable(const UnicodeString& str, UErrorCode& status) const;
102     int32_t findText(const UnicodeString& str, const UnicodeString& key,
103                      int32_t startingAt, int32_t* resultCount) const;
104 
105 private:
106     int64_t baseValue;
107     int32_t radix;
108     int16_t exponent;
109     UChar decimalPoint;
110     UnicodeString ruleText;
111     NFSubstitution* sub1;
112     NFSubstitution* sub2;
113     const RuleBasedNumberFormat* formatter;
114     const PluralFormat* rulePatternFormat;
115 
116     NFRule(const NFRule &other); // forbid copying of this class
117     NFRule &operator=(const NFRule &other); // forbid copying of this class
118 };
119 
120 U_NAMESPACE_END
121 
122 /* U_HAVE_RBNF */
123 #endif
124 
125 // NFRULE_H
126 #endif
127 
128