icuSources/i18n/nfrule.h

   1 /*
   2 *******************************************************************************
   3 * Copyright (C) 1997-2008, 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 RuleBasedNumberFormat;
  29 class UnicodeString;
  30
  31 class NFRule : public UMemory {
  32 public:
  33
  34     enum ERuleType {
  35         kNoBase = 0,
  36         kNegativeNumberRule = -1,
  37         kImproperFractionRule = -2,
  38         kProperFractionRule = -3,
  39         kMasterRule = -4,
  40         kOtherRule = -5
  41     };
  42
  43     static void makeRules(UnicodeString& definition,
  44                           const NFRuleSet* ruleSet,
  45                           const NFRule* predecessor,
  46                           const RuleBasedNumberFormat* rbnf,
  47                           NFRuleList& ruleList,
  48                           UErrorCode& status);
  49
  50     NFRule(const RuleBasedNumberFormat* rbnf);
  51     ~NFRule();
  52
  53     UBool operator==(const NFRule& rhs) const;
  54     UBool operator!=(const NFRule& rhs) const { return !operator==(rhs); }
  55
  56     ERuleType getType() const { return (ERuleType)(baseValue <= kNoBase ? (ERuleType)baseValue : kOtherRule); }
  57     void setType(ERuleType ruleType) { baseValue = (int32_t)ruleType; }
  58
  59     int64_t getBaseValue() const { return baseValue; }
  60     void setBaseValue(int64_t value, UErrorCode& status);
  61
  62     double getDivisor() const { return uprv_pow(radix, exponent); }
  63
  64     void doFormat(int64_t number, UnicodeString& toAppendTo, int32_t pos) const;
  65     void doFormat(double  number, UnicodeString& toAppendTo, int32_t pos) const;
  66
  67     UBool doParse(const UnicodeString& text,
  68                   ParsePosition& pos,
  69                   UBool isFractional,
  70                   double upperBound,
  71                   Formattable& result) const;
  72
  73     UBool shouldRollBack(double number) const;
  74
  75     void _appendRuleText(UnicodeString& result) const;
  76
  77 private:
  78     void parseRuleDescriptor(UnicodeString& descriptor, UErrorCode& status);
  79     void extractSubstitutions(const NFRuleSet* ruleSet, const NFRule* predecessor, const RuleBasedNumberFormat* rbnf, UErrorCode& status);
  80     NFSubstitution* extractSubstitution(const NFRuleSet* ruleSet, const NFRule* predecessor, const RuleBasedNumberFormat* rbnf, UErrorCode& status);
  81
  82     int16_t expectedExponent() const;
  83     int32_t indexOfAny(const UChar* const strings[]) const;
  84     double matchToDelimiter(const UnicodeString& text, int32_t startPos, double baseValue,
  85                             const UnicodeString& delimiter, ParsePosition& pp, const NFSubstitution* sub,
  86                             double upperBound) const;
  87     void stripPrefix(UnicodeString& text, const UnicodeString& prefix, ParsePosition& pp) const;
  88
  89     int32_t prefixLength(const UnicodeString& str, const UnicodeString& prefix, UErrorCode& status) const;
  90     UBool allIgnorable(const UnicodeString& str, UErrorCode& status) const;
  91     int32_t findText(const UnicodeString& str, const UnicodeString& key,
  92                      int32_t startingAt, int32_t* resultCount) const;
  93
  94 private:
  95     int64_t baseValue;
  96     int32_t radix;
  97     int16_t exponent;
  98     UnicodeString ruleText;
  99     NFSubstitution* sub1;
 100     NFSubstitution* sub2;
 101     const RuleBasedNumberFormat* formatter;
 102
 103     NFRule(const NFRule &other); // forbid copying of this class
 104     NFRule &operator=(const NFRule &other); // forbid copying of this class
 105 };
 106
 107 U_NAMESPACE_END
 108
 109 /* U_HAVE_RBNF */
 110 #endif
 111
 112 // NFRULE_H
 113 #endif
 114