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      1 /*
      2 *******************************************************************************
      3 * Copyright (C) 1997-2015, 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         kInfinityRule = -5,
     42         kNaNRule = -6,
     43         kOtherRule = -7
     44     };
     45 
     46     static void makeRules(UnicodeString& definition,
     47                           NFRuleSet* ruleSet,
     48                           const NFRule* predecessor,
     49                           const RuleBasedNumberFormat* rbnf,
     50                           NFRuleList& ruleList,
     51                           UErrorCode& status);
     52 
     53     NFRule(const RuleBasedNumberFormat* rbnf, const UnicodeString &ruleText, UErrorCode &status);
     54     ~NFRule();
     55 
     56     UBool operator==(const NFRule& rhs) const;
     57     UBool operator!=(const NFRule& rhs) const { return !operator==(rhs); }
     58 
     59     ERuleType getType() const { return (ERuleType)(baseValue <= kNoBase ? (ERuleType)baseValue : kOtherRule); }
     60     void setType(ERuleType ruleType) { baseValue = (int32_t)ruleType; }
     61 
     62     int64_t getBaseValue() const { return baseValue; }
     63     void setBaseValue(int64_t value, UErrorCode& status);
     64 
     65     UChar getDecimalPoint() const { return decimalPoint; }
     66 
     67     double getDivisor() const { return uprv_pow(radix, exponent); }
     68 
     69     void doFormat(int64_t number, UnicodeString& toAppendTo, int32_t pos, int32_t recursionCount, UErrorCode& status) const;
     70     void doFormat(double  number, UnicodeString& toAppendTo, int32_t pos, int32_t recursionCount, UErrorCode& status) const;
     71 
     72     UBool doParse(const UnicodeString& text,
     73                   ParsePosition& pos,
     74                   UBool isFractional,
     75                   double upperBound,
     76                   Formattable& result) const;
     77 
     78     UBool shouldRollBack(double number) const;
     79 
     80     void _appendRuleText(UnicodeString& result) const;
     81 
     82     int32_t findTextLenient(const UnicodeString& str, const UnicodeString& key,
     83                      int32_t startingAt, int32_t* resultCount) const;
     84 
     85     void setDecimalFormatSymbols(const DecimalFormatSymbols &newSymbols, UErrorCode& status);
     86 
     87 private:
     88     void parseRuleDescriptor(UnicodeString& descriptor, UErrorCode& status);
     89     void extractSubstitutions(const NFRuleSet* ruleSet, const UnicodeString &ruleText, const NFRule* predecessor, UErrorCode& status);
     90     NFSubstitution* extractSubstitution(const NFRuleSet* ruleSet, const NFRule* predecessor, UErrorCode& status);
     91 
     92     int16_t expectedExponent() const;
     93     int32_t indexOfAnyRulePrefix() const;
     94     double matchToDelimiter(const UnicodeString& text, int32_t startPos, double baseValue,
     95                             const UnicodeString& delimiter, ParsePosition& pp, const NFSubstitution* sub,
     96                             double upperBound) const;
     97     void stripPrefix(UnicodeString& text, const UnicodeString& prefix, ParsePosition& pp) const;
     98 
     99     int32_t prefixLength(const UnicodeString& str, const UnicodeString& prefix, UErrorCode& status) const;
    100     UBool allIgnorable(const UnicodeString& str, UErrorCode& status) const;
    101     int32_t findText(const UnicodeString& str, const UnicodeString& key,
    102                      int32_t startingAt, int32_t* resultCount) const;
    103 
    104 private:
    105     int64_t baseValue;
    106     int32_t radix;
    107     int16_t exponent;
    108     UChar decimalPoint;
    109     UnicodeString ruleText;
    110     NFSubstitution* sub1;
    111     NFSubstitution* sub2;
    112     const RuleBasedNumberFormat* formatter;
    113     const PluralFormat* rulePatternFormat;
    114 
    115     NFRule(const NFRule &other); // forbid copying of this class
    116     NFRule &operator=(const NFRule &other); // forbid copying of this class
    117 };
    118 
    119 U_NAMESPACE_END
    120 
    121 /* U_HAVE_RBNF */
    122 #endif
    123 
    124 // NFRULE_H
    125 #endif
    126 
    127