icuSources/i18n/plurrule_impl.h

   1 /*
   2 *******************************************************************************
   3 * Copyright (C) 2007-2013, International Business Machines Corporation and
   4 * others. All Rights Reserved.
   5 *******************************************************************************
   6 *
   7 * File PLURRULE_IMPL.H
   8 *
   9 *******************************************************************************
  10 */
  11
  12
  13 #ifndef PLURRULE_IMPLE
  14 #define PLURRULE_IMPLE
  15
  16 // Internal definitions for the PluralRules implementation.
  17
  18 #if !UCONFIG_NO_FORMATTING
  19
  20 #include "unicode/format.h"
  21 #include "unicode/locid.h"
  22 #include "unicode/parseerr.h"
  23 #include "unicode/ures.h"
  24 #include "unicode/utypes.h"
  25 #include "uvector.h"
  26 #include "hash.h"
  27
  28 class PluralRulesTest;
  29
  30 U_NAMESPACE_BEGIN
  31
  32 class AndConstraint;
  33 class RuleChain;
  34
  35 static const UChar DOT             = ((UChar)0x002E);
  36 static const UChar SINGLE_QUOTE    = ((UChar)0x0027);
  37 static const UChar SLASH           = ((UChar)0x002F);
  38 static const UChar BACKSLASH       = ((UChar)0x005C);
  39 static const UChar SPACE           = ((UChar)0x0020);
  40 static const UChar EXCLAMATION     = ((UChar)0x0021);
  41 static const UChar QUOTATION_MARK  = ((UChar)0x0022);
  42 static const UChar NUMBER_SIGN     = ((UChar)0x0023);
  43 static const UChar PERCENT_SIGN    = ((UChar)0x0025);
  44 static const UChar ASTERISK        = ((UChar)0x002A);
  45 static const UChar COMMA           = ((UChar)0x002C);
  46 static const UChar HYPHEN          = ((UChar)0x002D);
  47 static const UChar U_ZERO          = ((UChar)0x0030);
  48 static const UChar U_ONE           = ((UChar)0x0031);
  49 static const UChar U_TWO           = ((UChar)0x0032);
  50 static const UChar U_THREE         = ((UChar)0x0033);
  51 static const UChar U_FOUR          = ((UChar)0x0034);
  52 static const UChar U_FIVE          = ((UChar)0x0035);
  53 static const UChar U_SIX           = ((UChar)0x0036);
  54 static const UChar U_SEVEN         = ((UChar)0x0037);
  55 static const UChar U_EIGHT         = ((UChar)0x0038);
  56 static const UChar U_NINE          = ((UChar)0x0039);
  57 static const UChar COLON           = ((UChar)0x003A);
  58 static const UChar SEMI_COLON      = ((UChar)0x003B);
  59 static const UChar EQUALS          = ((UChar)0x003D);
  60 static const UChar AT              = ((UChar)0x0040);
  61 static const UChar CAP_A           = ((UChar)0x0041);
  62 static const UChar CAP_B           = ((UChar)0x0042);
  63 static const UChar CAP_R           = ((UChar)0x0052);
  64 static const UChar CAP_Z           = ((UChar)0x005A);
  65 static const UChar LOWLINE         = ((UChar)0x005F);
  66 static const UChar LEFTBRACE       = ((UChar)0x007B);
  67 static const UChar RIGHTBRACE      = ((UChar)0x007D);
  68 static const UChar TILDE           = ((UChar)0x007E);
  69 static const UChar ELLIPSIS        = ((UChar)0x2026);
  70
  71 static const UChar LOW_A           = ((UChar)0x0061);
  72 static const UChar LOW_B           = ((UChar)0x0062);
  73 static const UChar LOW_C           = ((UChar)0x0063);
  74 static const UChar LOW_D           = ((UChar)0x0064);
  75 static const UChar LOW_E           = ((UChar)0x0065);
  76 static const UChar LOW_F           = ((UChar)0x0066);
  77 static const UChar LOW_G           = ((UChar)0x0067);
  78 static const UChar LOW_H           = ((UChar)0x0068);
  79 static const UChar LOW_I           = ((UChar)0x0069);
  80 static const UChar LOW_J           = ((UChar)0x006a);
  81 static const UChar LOW_K           = ((UChar)0x006B);
  82 static const UChar LOW_L           = ((UChar)0x006C);
  83 static const UChar LOW_M           = ((UChar)0x006D);
  84 static const UChar LOW_N           = ((UChar)0x006E);
  85 static const UChar LOW_O           = ((UChar)0x006F);
  86 static const UChar LOW_P           = ((UChar)0x0070);
  87 static const UChar LOW_Q           = ((UChar)0x0071);
  88 static const UChar LOW_R           = ((UChar)0x0072);
  89 static const UChar LOW_S           = ((UChar)0x0073);
  90 static const UChar LOW_T           = ((UChar)0x0074);
  91 static const UChar LOW_U           = ((UChar)0x0075);
  92 static const UChar LOW_V           = ((UChar)0x0076);
  93 static const UChar LOW_W           = ((UChar)0x0077);
  94 static const UChar LOW_Y           = ((UChar)0x0079);
  95 static const UChar LOW_Z           = ((UChar)0x007A);
  96
  97
  98 static const int32_t PLURAL_RANGE_HIGH = 0x7fffffff;
  99
 100 enum tokenType {
 101   none,
 102   tNumber,
 103   tComma,
 104   tSemiColon,
 105   tSpace,
 106   tColon,
 107   tAt,           // '@'
 108   tDot,
 109   tDot2,
 110   tEllipsis,
 111   tKeyword,
 112   tAnd,
 113   tOr,
 114   tMod,          // 'mod' or '%'
 115   tNot,          //  'not' only.
 116   tIn,           //  'in'  only.
 117   tEqual,        //  '='   only.
 118   tNotEqual,     //  '!='
 119   tTilde,
 120   tWithin,
 121   tIs,
 122   tVariableN,
 123   tVariableI,
 124   tVariableF,
 125   tVariableV,
 126   tVariableT,
 127   tDecimal,
 128   tInteger,
 129   tEOF
 130 };
 131
 132
 133 class PluralRuleParser: public UMemory {
 134 public:
 135     PluralRuleParser();
 136     virtual ~PluralRuleParser();
 137
 138     void parse(const UnicodeString &rules, PluralRules *dest, UErrorCode &status);
 139     void getNextToken(UErrorCode &status);
 140     void checkSyntax(UErrorCode &status);
 141     static int32_t getNumberValue(const UnicodeString &token);
 142
 143 private:
 144     static tokenType getKeyType(const UnicodeString& token, tokenType type);
 145     static tokenType charType(UChar ch);
 146     static UBool isValidKeyword(const UnicodeString& token);
 147
 148     const UnicodeString  *ruleSrc;  // The rules string.
 149     int32_t        ruleIndex;       // String index in the input rules, the current parse position.
 150     UnicodeString  token;           // Token most recently scanned.
 151     tokenType      type;
 152     tokenType      prevType;
 153
 154                                     // The items currently being parsed & built.
 155                                     // Note: currentChain may not be the last RuleChain in the
 156                                     //       list because the "other" chain is forced to the end.
 157     AndConstraint *curAndConstraint;
 158     RuleChain     *currentChain;
 159
 160     int32_t        rangeLowIdx;     // Indices in the UVector of ranges of the
 161     int32_t        rangeHiIdx;      //    low and hi values currently being parsed.
 162
 163     enum EParseState {
 164        kKeyword,
 165        kExpr,
 166        kValue,
 167        kRangeList,
 168        kSamples
 169     };
 170
 171 };
 172
 173 /**
 174  * class FixedDecimal serves to communicate the properties
 175  * of a formatted number from a decimal formatter to PluralRules::select()
 176  *
 177  * see DecimalFormat::getFixedDecimal()
 178  * @internal
 179  */
 180 class U_I18N_API FixedDecimal: public UMemory {
 181   public:
 182     /**
 183       * @param n   the number, e.g. 12.345
 184       * @param v   The number of visible fraction digits, e.g. 3
 185       * @param f   The fraction digits, e.g. 345
 186       */
 187     FixedDecimal(double  n, int32_t v, int64_t f);
 188     FixedDecimal(double n, int32_t);
 189     explicit FixedDecimal(double n);
 190     FixedDecimal();
 191     FixedDecimal(const UnicodeString &s, UErrorCode &ec);
 192     FixedDecimal(const FixedDecimal &other);
 193
 194     double get(tokenType operand) const;
 195     int32_t getVisibleFractionDigitCount() const;
 196
 197     void init(double n, int32_t v, int64_t f);
 198     void init(double n);
 199     UBool quickInit(double n);  // Try a fast-path only initialization,
 200                                 //    return TRUE if successful.
 201     void adjustForMinFractionDigits(int32_t min);
 202     static int64_t getFractionalDigits(double n, int32_t v);
 203     static int32_t decimals(double n);
 204
 205     double      source;
 206     int32_t     visibleDecimalDigitCount;
 207     int64_t     decimalDigits;
 208     int64_t     decimalDigitsWithoutTrailingZeros;
 209     int64_t     intValue;
 210     UBool       hasIntegerValue;
 211     UBool       isNegative;
 212     UBool       isNanOrInfinity;
 213 };
 214
 215 class AndConstraint : public UMemory  {
 216 public:
 217     typedef enum RuleOp {
 218         NONE,
 219         MOD
 220     } RuleOp;
 221     RuleOp  op;
 222     int32_t opNum;           // for mod expressions, the right operand of the mod.
 223     int32_t     value;       // valid for 'is' rules only.
 224     UVector32   *rangeList;  // for 'in', 'within' rules. Null otherwise.
 225     UBool   negated;           // TRUE for negated rules.
 226     UBool   integerOnly;     // TRUE for 'within' rules.
 227     tokenType digitsType;    // n | i | v | f constraint.
 228     AndConstraint *next;
 229
 230     AndConstraint();
 231     AndConstraint(const AndConstraint& other);
 232     virtual ~AndConstraint();
 233     AndConstraint* add();
 234     // UBool isFulfilled(double number);
 235     UBool isFulfilled(const FixedDecimal &number);
 236 };
 237
 238 class OrConstraint : public UMemory  {
 239 public:
 240     AndConstraint *childNode;
 241     OrConstraint *next;
 242     OrConstraint();
 243
 244     OrConstraint(const OrConstraint& other);
 245     virtual ~OrConstraint();
 246     AndConstraint* add();
 247     // UBool isFulfilled(double number);
 248     UBool isFulfilled(const FixedDecimal &number);
 249 };
 250
 251 class RuleChain : public UMemory  {
 252 public:
 253     UnicodeString   fKeyword;
 254     RuleChain      *fNext;
 255     OrConstraint   *ruleHeader;
 256     UnicodeString   fDecimalSamples;  // Samples strings from rule source
 257     UnicodeString   fIntegerSamples;  //   without @decimal or @integer, otherwise unprocessed.
 258     UBool           fDecimalSamplesUnbounded;
 259     UBool           fIntegerSamplesUnbounded;
 260
 261
 262     RuleChain();
 263     RuleChain(const RuleChain& other);
 264     virtual ~RuleChain();
 265
 266     UnicodeString select(const FixedDecimal &number) const;
 267     void          dumpRules(UnicodeString& result);
 268     UErrorCode    getKeywords(int32_t maxArraySize, UnicodeString *keywords, int32_t& arraySize) const;
 269     UBool         isKeyword(const UnicodeString& keyword) const;
 270 };
 271
 272 class PluralKeywordEnumeration : public StringEnumeration {
 273 public:
 274     PluralKeywordEnumeration(RuleChain *header, UErrorCode& status);
 275     virtual ~PluralKeywordEnumeration();
 276     static UClassID U_EXPORT2 getStaticClassID(void);
 277     virtual UClassID getDynamicClassID(void) const;
 278     virtual const UnicodeString* snext(UErrorCode& status);
 279     virtual void reset(UErrorCode& status);
 280     virtual int32_t count(UErrorCode& status) const;
 281 private:
 282     int32_t         pos;
 283     UVector         fKeywordNames;
 284 };
 285
 286
 287 class U_I18N_API PluralAvailableLocalesEnumeration: public StringEnumeration {
 288   public:
 289     PluralAvailableLocalesEnumeration(UErrorCode &status);
 290     virtual ~PluralAvailableLocalesEnumeration();
 291     virtual const char* next(int32_t *resultLength, UErrorCode& status);
 292     virtual void reset(UErrorCode& status);
 293     virtual int32_t count(UErrorCode& status) const;
 294   private:
 295     UErrorCode      fOpenStatus;
 296     UResourceBundle *fLocales;
 297     UResourceBundle *fRes;
 298 };
 299
 300 U_NAMESPACE_END
 301
 302 #endif /* #if !UCONFIG_NO_FORMATTING */
 303
 304 #endif // _PLURRULE_IMPL
 305 //eof