icuSources/i18n/nfrule.h

   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,
  77                   UBool isDecimFmtParseable=TRUE) const;
  78
  79     UBool shouldRollBack(double 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