icuSources/i18n/nfrule.h

   1 /*
   2 *******************************************************************************
   3 * Copyright (C) 1997-2004, International Business Machines Corporation and others. All Rights Reserved.
   4 *******************************************************************************
   5 */
   6
   7 #ifndef NFRULE_H
   8 #define NFRULE_H
   9
  10 #include "unicode/rbnf.h"
  11
  12 #if U_HAVE_RBNF
  13
  14 #include "unicode/utypes.h"
  15 #include "unicode/uobject.h"
  16 #include "unicode/unistr.h"
  17 #include "putilimp.h"
  18
  19 U_NAMESPACE_BEGIN
  20
  21 class FieldPosition;
  22 class Formattable;
  23 class NFRuleList;
  24 class NFRuleSet;
  25 class NFSubstitution;
  26 class ParsePosition;
  27 class RuleBasedNumberFormat;
  28 class UnicodeString;
  29
  30 class NFRule : public UMemory {
  31 public:
  32
  33     enum ERuleType {
  34         kNoBase = 0,
  35         kNegativeNumberRule = -1,
  36         kImproperFractionRule = -2,
  37         kProperFractionRule = -3,
  38         kMasterRule = -4,
  39         kOtherRule = -5
  40     };
  41
  42     static void makeRules(UnicodeString& definition,
  43                           const NFRuleSet* ruleSet,
  44                           const NFRule* predecessor,
  45                           const RuleBasedNumberFormat* rbnf,
  46                           NFRuleList& ruleList,
  47                           UErrorCode& status);
  48
  49     NFRule(const RuleBasedNumberFormat* rbnf);
  50     ~NFRule();
  51
  52     UBool operator==(const NFRule& rhs) const;
  53     UBool operator!=(const NFRule& rhs) const { return !operator==(rhs); }
  54
  55     ERuleType getType() const { return (ERuleType)(baseValue <= kNoBase ? (ERuleType)baseValue : kOtherRule); }
  56     void setType(ERuleType ruleType) { baseValue = (int32_t)ruleType; }
  57
  58     int64_t getBaseValue() const { return baseValue; }
  59     void setBaseValue(int64_t value, UErrorCode& status);
  60
  61     double getDivisor() const { return uprv_pow(radix, exponent); }
  62
  63     void doFormat(int64_t number, UnicodeString& toAppendTo, int32_t pos) const;
  64     void doFormat(double  number, UnicodeString& toAppendTo, int32_t pos) const;
  65
  66     UBool doParse(const UnicodeString& text,
  67                   ParsePosition& pos,
  68                   UBool isFractional,
  69                   double upperBound,
  70                   Formattable& result) const;
  71
  72     UBool shouldRollBack(double number) const;
  73
  74     void appendRuleText(UnicodeString& result) const;
  75
  76 private:
  77     void parseRuleDescriptor(UnicodeString& descriptor, UErrorCode& status);
  78     void extractSubstitutions(const NFRuleSet* ruleSet, const NFRule* predecessor, const RuleBasedNumberFormat* rbnf, UErrorCode& status);
  79     NFSubstitution* extractSubstitution(const NFRuleSet* ruleSet, const NFRule* predecessor, const RuleBasedNumberFormat* rbnf, UErrorCode& status);
  80
  81     int16_t expectedExponent() const;
  82     int32_t indexOfAny(const UChar* const strings[]) const;
  83     double matchToDelimiter(const UnicodeString& text, int32_t startPos, double baseValue,
  84                             const UnicodeString& delimiter, ParsePosition& pp, const NFSubstitution* sub,
  85                             double upperBound) const;
  86     void stripPrefix(UnicodeString& text, const UnicodeString& prefix, ParsePosition& pp) const;
  87
  88     int32_t prefixLength(const UnicodeString& str, const UnicodeString& prefix) const;
  89     UBool allIgnorable(const UnicodeString& str) const;
  90     int32_t findText(const UnicodeString& str, const UnicodeString& key,
  91                      int32_t startingAt, int32_t* resultCount) const;
  92
  93 private:
  94     int64_t baseValue;
  95     int32_t radix;
  96     int16_t exponent;
  97     UnicodeString ruleText;
  98     NFSubstitution* sub1;
  99     NFSubstitution* sub2;
 100     const RuleBasedNumberFormat* formatter;
 101
 102     NFRule(const NFRule &other); // forbid copying of this class
 103     NFRule &operator=(const NFRule &other); // forbid copying of this class
 104 };
 105
 106 U_NAMESPACE_END
 107
 108 /* U_HAVE_RBNF */
 109 #endif
 110
 111 // NFRULE_H
 112 #endif
 113