The Tor Browser: intl/icu/source/i18n/nfrule.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/nfrule.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/nfrule.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
 ******************************************************************************
 *   Copyright (C) 1997-2011, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 ******************************************************************************
 *   file name:  nfrule.cpp
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 * Modification history
 * Date        Name      Comments
 * 10/11/2001  Doug      Ported from ICU4J
 */
 #include "nfrule.h"
 #if U_HAVE_RBNF
 #include "unicode/rbnf.h"
 #include "unicode/tblcoll.h"
 #include "unicode/coleitr.h"
 #include "unicode/uchar.h"
 #include "nfrs.h"
 #include "nfrlist.h"
 #include "nfsubs.h"
 #include "patternprops.h"
 U_NAMESPACE_BEGIN
 NFRule::NFRule(const RuleBasedNumberFormat* _rbnf)
   : baseValue((int32_t)0)
   , radix(0)
   , exponent(0)
   , ruleText()
   , sub1(NULL)
   , sub2(NULL)
   , formatter(_rbnf)
 {
 }
 NFRule::~NFRule()
 {
   delete sub1;
   delete sub2;
 }
 static const UChar gLeftBracket = 0x005b;
 static const UChar gRightBracket = 0x005d;
 static const UChar gColon = 0x003a;
 static const UChar gZero = 0x0030;
 static const UChar gNine = 0x0039;
 static const UChar gSpace = 0x0020;
 static const UChar gSlash = 0x002f;
 static const UChar gGreaterThan = 0x003e;
 static const UChar gLessThan = 0x003c;
 static const UChar gComma = 0x002c;
 static const UChar gDot = 0x002e;
 static const UChar gTick = 0x0027;
 //static const UChar gMinus = 0x002d;
 static const UChar gSemicolon = 0x003b;
 static const UChar gMinusX[] =                  {0x2D, 0x78, 0};    /* "-x" */
 static const UChar gXDotX[] =                   {0x78, 0x2E, 0x78, 0}; /* "x.x" */
 static const UChar gXDotZero[] =                {0x78, 0x2E, 0x30, 0}; /* "x.0" */
 static const UChar gZeroDotX[] =                {0x30, 0x2E, 0x78, 0}; /* "0.x" */
 static const UChar gLessLess[] =                {0x3C, 0x3C, 0};    /* "<<" */
 static const UChar gLessPercent[] =             {0x3C, 0x25, 0};    /* "<%" */
 static const UChar gLessHash[] =                {0x3C, 0x23, 0};    /* "<#" */
 static const UChar gLessZero[] =                {0x3C, 0x30, 0};    /* "<0" */
 static const UChar gGreaterGreater[] =          {0x3E, 0x3E, 0};    /* ">>" */
 static const UChar gGreaterPercent[] =          {0x3E, 0x25, 0};    /* ">%" */
 static const UChar gGreaterHash[] =             {0x3E, 0x23, 0};    /* ">#" */
 static const UChar gGreaterZero[] =             {0x3E, 0x30, 0};    /* ">0" */
 static const UChar gEqualPercent[] =            {0x3D, 0x25, 0};    /* "=%" */
 static const UChar gEqualHash[] =               {0x3D, 0x23, 0};    /* "=#" */
 static const UChar gEqualZero[] =               {0x3D, 0x30, 0};    /* "=0" */
 static const UChar gGreaterGreaterGreater[] =   {0x3E, 0x3E, 0x3E, 0}; /* ">>>" */
 static const UChar * const tokenStrings[] = {
     gLessLess, gLessPercent, gLessHash, gLessZero,
     gGreaterGreater, gGreaterPercent,gGreaterHash, gGreaterZero,
     gEqualPercent, gEqualHash, gEqualZero, NULL
 };
 void
 NFRule::makeRules(UnicodeString& description,
                   const NFRuleSet *ruleSet,
                   const NFRule *predecessor,
                   const RuleBasedNumberFormat *rbnf,
                   NFRuleList& rules,
                   UErrorCode& status)
 {
     // we know we're making at least one rule, so go ahead and
     // new it up and initialize its basevalue and divisor
     // (this also strips the rule descriptor, if any, off the
     // descripton string)
     NFRule* rule1 = new NFRule(rbnf);
     /* test for NULL */
     if (rule1 == 0) {
         status = U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     rule1->parseRuleDescriptor(description, status);
     // check the description to see whether there's text enclosed
     // in brackets
     int32_t brack1 = description.indexOf(gLeftBracket);
     int32_t brack2 = description.indexOf(gRightBracket);
     // if the description doesn't contain a matched pair of brackets,
     // or if it's of a type that doesn't recognize bracketed text,
     // then leave the description alone, initialize the rule's
     // rule text and substitutions, and return that rule
     if (brack1 == -1 || brack2 == -1 || brack1 > brack2
         || rule1->getType() == kProperFractionRule
         || rule1->getType() == kNegativeNumberRule) {
         rule1->ruleText = description;
         rule1->extractSubstitutions(ruleSet, predecessor, rbnf, status);
         rules.add(rule1);
     } else {
         // if the description does contain a matched pair of brackets,
         // then it's really shorthand for two rules (with one exception)
         NFRule* rule2 = NULL;
         UnicodeString sbuf;
         // we'll actually only split the rule into two rules if its
         // base value is an even multiple of its divisor (or it's one
         // of the special rules)
         if ((rule1->baseValue > 0
             && (rule1->baseValue % util64_pow(rule1->radix, rule1->exponent)) == 0)
             || rule1->getType() == kImproperFractionRule
             || rule1->getType() == kMasterRule) {
             // if it passes that test, new up the second rule.  If the
             // rule set both rules will belong to is a fraction rule
             // set, they both have the same base value; otherwise,
             // increment the original rule's base value ("rule1" actually
             // goes SECOND in the rule set's rule list)
             rule2 = new NFRule(rbnf);
             /* test for NULL */
             if (rule2 == 0) {
                 status = U_MEMORY_ALLOCATION_ERROR;
                 return;
             }
             if (rule1->baseValue >= 0) {
                 rule2->baseValue = rule1->baseValue;
                 if (!ruleSet->isFractionRuleSet()) {
                     ++rule1->baseValue;
                 }
             }
             // if the description began with "x.x" and contains bracketed
             // text, it describes both the improper fraction rule and
             // the proper fraction rule
             else if (rule1->getType() == kImproperFractionRule) {
                 rule2->setType(kProperFractionRule);
             }
             // if the description began with "x.0" and contains bracketed
             // text, it describes both the master rule and the
             // improper fraction rule
             else if (rule1->getType() == kMasterRule) {
                 rule2->baseValue = rule1->baseValue;
                 rule1->setType(kImproperFractionRule);
             }
             // both rules have the same radix and exponent (i.e., the
             // same divisor)
             rule2->radix = rule1->radix;
             rule2->exponent = rule1->exponent;
             // rule2's rule text omits the stuff in brackets: initalize
             // its rule text and substitutions accordingly
             sbuf.append(description, 0, brack1);
             if (brack2 + 1 < description.length()) {
                 sbuf.append(description, brack2 + 1, description.length() - brack2 - 1);
             }
             rule2->ruleText.setTo(sbuf);
             rule2->extractSubstitutions(ruleSet, predecessor, rbnf, status);
         }
         // rule1's text includes the text in the brackets but omits
         // the brackets themselves: initialize _its_ rule text and
         // substitutions accordingly
         sbuf.setTo(description, 0, brack1);
         sbuf.append(description, brack1 + 1, brack2 - brack1 - 1);
         if (brack2 + 1 < description.length()) {
             sbuf.append(description, brack2 + 1, description.length() - brack2 - 1);
         }
         rule1->ruleText.setTo(sbuf);
         rule1->extractSubstitutions(ruleSet, predecessor, rbnf, status);
         // if we only have one rule, return it; if we have two, return
         // a two-element array containing them (notice that rule2 goes
         // BEFORE rule1 in the list: in all cases, rule2 OMITS the
         // material in the brackets and rule1 INCLUDES the material
         // in the brackets)
         if (rule2 != NULL) {
             rules.add(rule2);
         }
         rules.add(rule1);
     }
 }
 /**
  * This function parses the rule's rule descriptor (i.e., the base
  * value and/or other tokens that precede the rule's rule text
  * in the description) and sets the rule's base value, radix, and
  * exponent according to the descriptor.  (If the description doesn't
  * include a rule descriptor, then this function sets everything to
  * default values and the rule set sets the rule's real base value).
  * @param description The rule's description
  * @return If "description" included a rule descriptor, this is
  * "description" with the descriptor and any trailing whitespace
  * stripped off.  Otherwise; it's "descriptor" unchangd.
  */
 void
 NFRule::parseRuleDescriptor(UnicodeString& description, UErrorCode& status)
 {
     // the description consists of a rule descriptor and a rule body,
     // separated by a colon.  The rule descriptor is optional.  If
     // it's omitted, just set the base value to 0.
     int32_t p = description.indexOf(gColon);
     if (p == -1) {
         setBaseValue((int32_t)0, status);
     } else {
         // copy the descriptor out into its own string and strip it,
         // along with any trailing whitespace, out of the original
         // description
         UnicodeString descriptor;
         descriptor.setTo(description, 0, p);
         ++p;
         while (p < description.length() && PatternProps::isWhiteSpace(description.charAt(p))) {
             ++p;
         }
         description.removeBetween(0, p);
         // check first to see if the rule descriptor matches the token
         // for one of the special rules.  If it does, set the base
         // value to the correct identfier value
         if (0 == descriptor.compare(gMinusX, 2)) {
             setType(kNegativeNumberRule);
         }
         else if (0 == descriptor.compare(gXDotX, 3)) {
             setType(kImproperFractionRule);
         }
         else if (0 == descriptor.compare(gZeroDotX, 3)) {
             setType(kProperFractionRule);
         }
         else if (0 == descriptor.compare(gXDotZero, 3)) {
             setType(kMasterRule);
         }
         // if the rule descriptor begins with a digit, it's a descriptor
         // for a normal rule
         // since we don't have Long.parseLong, and this isn't much work anyway,
         // just build up the value as we encounter the digits.
         else if (descriptor.charAt(0) >= gZero && descriptor.charAt(0) <= gNine) {
             int64_t val = 0;
             p = 0;
             UChar c = gSpace;
             // begin parsing the descriptor: copy digits
             // into "tempValue", skip periods, commas, and spaces,
             // stop on a slash or > sign (or at the end of the string),
             // and throw an exception on any other character
             int64_t ll_10 = 10;
             while (p < descriptor.length()) {
                 c = descriptor.charAt(p);
                 if (c >= gZero && c <= gNine) {
                     val = val * ll_10 + (int32_t)(c - gZero);
                 }
                 else if (c == gSlash || c == gGreaterThan) {
                     break;
                 }
                 else if (PatternProps::isWhiteSpace(c) || c == gComma || c == gDot) {
                 }
                 else {
                     // throw new IllegalArgumentException("Illegal character in rule descriptor");
                     status = U_PARSE_ERROR;
                     return;
                 }
                 ++p;
             }
             // we have the base value, so set it
             setBaseValue(val, status);
             // if we stopped the previous loop on a slash, we're
             // now parsing the rule's radix.  Again, accumulate digits
             // in tempValue, skip punctuation, stop on a > mark, and
             // throw an exception on anything else
             if (c == gSlash) {
                 val = 0;
                 ++p;
                 int64_t ll_10 = 10;
                 while (p < descriptor.length()) {
                     c = descriptor.charAt(p);
                     if (c >= gZero && c <= gNine) {
                         val = val * ll_10 + (int32_t)(c - gZero);
                     }
                     else if (c == gGreaterThan) {
                         break;
                     }
                     else if (PatternProps::isWhiteSpace(c) || c == gComma || c == gDot) {
                     }
                     else {
                         // throw new IllegalArgumentException("Illegal character is rule descriptor");
                         status = U_PARSE_ERROR;
                         return;
                     }
                     ++p;
                 }
                 // tempValue now contain's the rule's radix.  Set it
                 // accordingly, and recalculate the rule's exponent
                 radix = (int32_t)val;
                 if (radix == 0) {
                     // throw new IllegalArgumentException("Rule can't have radix of 0");
                     status = U_PARSE_ERROR;
                 }
                 exponent = expectedExponent();
             }
             // if we stopped the previous loop on a > sign, then continue
             // for as long as we still see > signs.  For each one,
             // decrement the exponent (unless the exponent is already 0).
             // If we see another character before reaching the end of
             // the descriptor, that's also a syntax error.
             if (c == gGreaterThan) {
                 while (p < descriptor.length()) {
                     c = descriptor.charAt(p);
                     if (c == gGreaterThan && exponent > 0) {
                         --exponent;
                     } else {
                         // throw new IllegalArgumentException("Illegal character in rule descriptor");
                         status = U_PARSE_ERROR;
                         return;
                     }
                     ++p;
                 }
             }
         }
     }
     // finally, if the rule body begins with an apostrophe, strip it off
     // (this is generally used to put whitespace at the beginning of
     // a rule's rule text)
     if (description.length() > 0 && description.charAt(0) == gTick) {
         description.removeBetween(0, 1);
     }
     // return the description with all the stuff we've just waded through
     // stripped off the front.  It now contains just the rule body.
     // return description;
 }
 /**
 * Searches the rule's rule text for the substitution tokens,
 * creates the substitutions, and removes the substitution tokens
 * from the rule's rule text.
 * @param owner The rule set containing this rule
 * @param predecessor The rule preseding this one in "owners" rule list
 * @param ownersOwner The RuleBasedFormat that owns this rule
 */
 void
 NFRule::extractSubstitutions(const NFRuleSet* ruleSet,
                              const NFRule* predecessor,
                              const RuleBasedNumberFormat* rbnf,
                              UErrorCode& status)
 {
     if (U_SUCCESS(status)) {
         sub1 = extractSubstitution(ruleSet, predecessor, rbnf, status);
         sub2 = extractSubstitution(ruleSet, predecessor, rbnf, status);
     }
 }
 /**
 * Searches the rule's rule text for the first substitution token,
 * creates a substitution based on it, and removes the token from
 * the rule's rule text.
 * @param owner The rule set containing this rule
 * @param predecessor The rule preceding this one in the rule set's
 * rule list
 * @param ownersOwner The RuleBasedNumberFormat that owns this rule
 * @return The newly-created substitution.  This is never null; if
 * the rule text doesn't contain any substitution tokens, this will
 * be a NullSubstitution.
 */
 NFSubstitution *
 NFRule::extractSubstitution(const NFRuleSet* ruleSet,
                             const NFRule* predecessor,
                             const RuleBasedNumberFormat* rbnf,
                             UErrorCode& status)
 {
     NFSubstitution* result = NULL;
     // search the rule's rule text for the first two characters of
     // a substitution token
     int32_t subStart = indexOfAny(tokenStrings);
     int32_t subEnd = subStart;
     // if we didn't find one, create a null substitution positioned
     // at the end of the rule text
     if (subStart == -1) {
         return NFSubstitution::makeSubstitution(ruleText.length(), this, predecessor,
             ruleSet, rbnf, UnicodeString(), status);
     }
     // special-case the ">>>" token, since searching for the > at the
     // end will actually find the > in the middle
     if (ruleText.indexOf(gGreaterGreaterGreater, 3, 0) == subStart) {
         subEnd = subStart + 2;
         // otherwise the substitution token ends with the same character
         // it began with
     } else {
         UChar c = ruleText.charAt(subStart);
         subEnd = ruleText.indexOf(c, subStart + 1);
         // special case for '<%foo<<'
         if (c == gLessThan && subEnd != -1 && subEnd < ruleText.length() - 1 && ruleText.charAt(subEnd+1) == c) {
             // ordinals use "=#,##0==%abbrev=" as their rule.  Notice that the '==' in the middle
             // occurs because of the juxtaposition of two different rules.  The check for '<' is a hack
             // to get around this.  Having the duplicate at the front would cause problems with
             // rules like "<<%" to format, say, percents...
             ++subEnd;
         }
    }
     // if we don't find the end of the token (i.e., if we're on a single,
     // unmatched token character), create a null substitution positioned
     // at the end of the rule
     if (subEnd == -1) {
         return NFSubstitution::makeSubstitution(ruleText.length(), this, predecessor,
             ruleSet, rbnf, UnicodeString(), status);
     }
     // if we get here, we have a real substitution token (or at least
     // some text bounded by substitution token characters).  Use
     // makeSubstitution() to create the right kind of substitution
     UnicodeString subToken;
     subToken.setTo(ruleText, subStart, subEnd + 1 - subStart);
     result = NFSubstitution::makeSubstitution(subStart, this, predecessor, ruleSet,
         rbnf, subToken, status);
     // remove the substitution from the rule text
     ruleText.removeBetween(subStart, subEnd+1);
     return result;
 }
 /**
  * Sets the rule's base value, and causes the radix and exponent
  * to be recalculated.  This is used during construction when we
  * don't know the rule's base value until after it's been
  * constructed.  It should be used at any other time.
  * @param The new base value for the rule.
  */
 void
 NFRule::setBaseValue(int64_t newBaseValue, UErrorCode& status)
 {
     // set the base value
     baseValue = newBaseValue;
     // if this isn't a special rule, recalculate the radix and exponent
     // (the radix always defaults to 10; if it's supposed to be something
     // else, it's cleaned up by the caller and the exponent is
     // recalculated again-- the only function that does this is
     // NFRule.parseRuleDescriptor() )
     if (baseValue >= 1) {
         radix = 10;
         exponent = expectedExponent();
         // this function gets called on a fully-constructed rule whose
         // description didn't specify a base value.  This means it
         // has substitutions, and some substitutions hold on to copies
         // of the rule's divisor.  Fix their copies of the divisor.
         if (sub1 != NULL) {
             sub1->setDivisor(radix, exponent, status);
         }
         if (sub2 != NULL) {
             sub2->setDivisor(radix, exponent, status);
         }
         // if this is a special rule, its radix and exponent are basically
         // ignored.  Set them to "safe" default values
     } else {
         radix = 10;
         exponent = 0;
     }
 }
 /**
 * This calculates the rule's exponent based on its radix and base
 * value.  This will be the highest power the radix can be raised to
 * and still produce a result less than or equal to the base value.
 */
 int16_t
 NFRule::expectedExponent() const
 {
     // since the log of 0, or the log base 0 of something, causes an
     // error, declare the exponent in these cases to be 0 (we also
     // deal with the special-rule identifiers here)
     if (radix == 0 || baseValue < 1) {
         return 0;
     }
     // we get rounding error in some cases-- for example, log 1000 / log 10
     // gives us 1.9999999996 instead of 2.  The extra logic here is to take
     // that into account
     int16_t tempResult = (int16_t)(uprv_log((double)baseValue) / uprv_log((double)radix));
     int64_t temp = util64_pow(radix, tempResult + 1);
     if (temp <= baseValue) {
         tempResult += 1;
     }
     return tempResult;
 }
 /**
  * Searches the rule's rule text for any of the specified strings.
  * @param strings An array of strings to search the rule's rule
  * text for
  * @return The index of the first match in the rule's rule text
  * (i.e., the first substring in the rule's rule text that matches
  * _any_ of the strings in "strings").  If none of the strings in
  * "strings" is found in the rule's rule text, returns -1.
  */
 int32_t
 NFRule::indexOfAny(const UChar* const strings[]) const
 {
     int result = -1;
     for (int i = 0; strings[i]; i++) {
         int32_t pos = ruleText.indexOf(*strings[i]);
         if (pos != -1 && (result == -1 || pos < result)) {
             result = pos;
         }
     }
     return result;
 }
 //-----------------------------------------------------------------------
 // boilerplate
 //-----------------------------------------------------------------------
 /**
 * Tests two rules for equality.
 * @param that The rule to compare this one against
 * @return True is the two rules are functionally equivalent
 */
 UBool
 NFRule::operator==(const NFRule& rhs) const
 {
     return baseValue == rhs.baseValue
         && radix == rhs.radix
         && exponent == rhs.exponent
         && ruleText == rhs.ruleText
         && *sub1 == *rhs.sub1
         && *sub2 == *rhs.sub2;
 }
 /**
 * Returns a textual representation of the rule.  This won't
 * necessarily be the same as the description that this rule
 * was created with, but it will produce the same result.
 * @return A textual description of the rule
 */
 static void util_append64(UnicodeString& result, int64_t n)
 {
     UChar buffer[256];
     int32_t len = util64_tou(n, buffer, sizeof(buffer));
     UnicodeString temp(buffer, len);
     result.append(temp);
 }
 void
 NFRule::_appendRuleText(UnicodeString& result) const
 {
     switch (getType()) {
     case kNegativeNumberRule: result.append(gMinusX, 2); break;
     case kImproperFractionRule: result.append(gXDotX, 3); break;
     case kProperFractionRule: result.append(gZeroDotX, 3); break;
     case kMasterRule: result.append(gXDotZero, 3); break;
     default:
         // for a normal rule, write out its base value, and if the radix is
         // something other than 10, write out the radix (with the preceding
         // slash, of course).  Then calculate the expected exponent and if
         // if isn't the same as the actual exponent, write an appropriate
         // number of > signs.  Finally, terminate the whole thing with
         // a colon.
         util_append64(result, baseValue);
         if (radix != 10) {
             result.append(gSlash);
             util_append64(result, radix);
         }
         int numCarets = expectedExponent() - exponent;
         for (int i = 0; i < numCarets; i++) {
             result.append(gGreaterThan);
         }
         break;
     }
     result.append(gColon);
     result.append(gSpace);
     // if the rule text begins with a space, write an apostrophe
     // (whitespace after the rule descriptor is ignored; the
     // apostrophe is used to make the whitespace significant)
     if (ruleText.charAt(0) == gSpace && sub1->getPos() != 0) {
         result.append(gTick);
     }
     // now, write the rule's rule text, inserting appropriate
     // substitution tokens in the appropriate places
     UnicodeString ruleTextCopy;
     ruleTextCopy.setTo(ruleText);
     UnicodeString temp;
     sub2->toString(temp);
     ruleTextCopy.insert(sub2->getPos(), temp);
     sub1->toString(temp);
     ruleTextCopy.insert(sub1->getPos(), temp);
     result.append(ruleTextCopy);
     // and finally, top the whole thing off with a semicolon and
     // return the result
     result.append(gSemicolon);
 }
 //-----------------------------------------------------------------------
 // formatting
 //-----------------------------------------------------------------------
 /**
 * Formats the number, and inserts the resulting text into
 * toInsertInto.
 * @param number The number being formatted
 * @param toInsertInto The string where the resultant text should
 * be inserted
 * @param pos The position in toInsertInto where the resultant text
 * should be inserted
 */
 void
 NFRule::doFormat(int64_t number, UnicodeString& toInsertInto, int32_t pos) const
 {
     // first, insert the rule's rule text into toInsertInto at the
     // specified position, then insert the results of the substitutions
     // into the right places in toInsertInto (notice we do the
     // substitutions in reverse order so that the offsets don't get
     // messed up)
     toInsertInto.insert(pos, ruleText);
     sub2->doSubstitution(number, toInsertInto, pos);
     sub1->doSubstitution(number, toInsertInto, pos);
 }
 /**
 * Formats the number, and inserts the resulting text into
 * toInsertInto.
 * @param number The number being formatted
 * @param toInsertInto The string where the resultant text should
 * be inserted
 * @param pos The position in toInsertInto where the resultant text
 * should be inserted
 */
 void
 NFRule::doFormat(double number, UnicodeString& toInsertInto, int32_t pos) const
 {
     // first, insert the rule's rule text into toInsertInto at the
     // specified position, then insert the results of the substitutions
     // into the right places in toInsertInto
     // [again, we have two copies of this routine that do the same thing
     // so that we don't sacrifice precision in a long by casting it
     // to a double]
     toInsertInto.insert(pos, ruleText);
     sub2->doSubstitution(number, toInsertInto, pos);
     sub1->doSubstitution(number, toInsertInto, pos);
 }
 /**
 * Used by the owning rule set to determine whether to invoke the
 * rollback rule (i.e., whether this rule or the one that precedes
 * it in the rule set's list should be used to format the number)
 * @param The number being formatted
 * @return True if the rule set should use the rule that precedes
 * this one in its list; false if it should use this rule
 */
 UBool
 NFRule::shouldRollBack(double number) const
 {
     // we roll back if the rule contains a modulus substitution,
     // the number being formatted is an even multiple of the rule's
     // divisor, and the rule's base value is NOT an even multiple
     // of its divisor
     // In other words, if the original description had
     //    100: << hundred[ >>];
     // that expands into
     //    100: << hundred;
     //    101: << hundred >>;
     // internally.  But when we're formatting 200, if we use the rule
     // at 101, which would normally apply, we get "two hundred zero".
     // To prevent this, we roll back and use the rule at 100 instead.
     // This is the logic that makes this happen: the rule at 101 has
     // a modulus substitution, its base value isn't an even multiple
     // of 100, and the value we're trying to format _is_ an even
     // multiple of 100.  This is called the "rollback rule."
     if ((sub1->isModulusSubstitution()) || (sub2->isModulusSubstitution())) {
         int64_t re = util64_pow(radix, exponent);
         return uprv_fmod(number, (double)re) == 0 && (baseValue % re) != 0;
     }
     return FALSE;
 }
 //-----------------------------------------------------------------------
 // parsing
 //-----------------------------------------------------------------------
 /**
 * Attempts to parse the string with this rule.
 * @param text The string being parsed
 * @param parsePosition On entry, the value is ignored and assumed to
 * be 0. On exit, this has been updated with the position of the first
 * character not consumed by matching the text against this rule
 * (if this rule doesn't match the text at all, the parse position
 * if left unchanged (presumably at 0) and the function returns
 * new Long(0)).
 * @param isFractionRule True if this rule is contained within a
 * fraction rule set.  This is only used if the rule has no
 * substitutions.
 * @return If this rule matched the text, this is the rule's base value
 * combined appropriately with the results of parsing the substitutions.
 * If nothing matched, this is new Long(0) and the parse position is
 * left unchanged.  The result will be an instance of Long if the
 * result is an integer and Double otherwise.  The result is never null.
 */
 #ifdef RBNF_DEBUG
 #include <stdio.h>
 static void dumpUS(FILE* f, const UnicodeString& us) {
   int len = us.length();
   char* buf = (char *)uprv_malloc((len+1)*sizeof(char)); //new char[len+1];
   if (buf != NULL) {
 	  us.extract(0, len, buf);
 	  buf[len] = 0;
 	  fprintf(f, "%s", buf);
 	  uprv_free(buf); //delete[] buf;
   }
 }
 #endif
 UBool
 NFRule::doParse(const UnicodeString& text,
                 ParsePosition& parsePosition,
                 UBool isFractionRule,
                 double upperBound,
                 Formattable& resVal) const
 {
     // internally we operate on a copy of the string being parsed
     // (because we're going to change it) and use our own ParsePosition
     ParsePosition pp;
     UnicodeString workText(text);
     // check to see whether the text before the first substitution
     // matches the text at the beginning of the string being
     // parsed.  If it does, strip that off the front of workText;
     // otherwise, dump out with a mismatch
     UnicodeString prefix;
     prefix.setTo(ruleText, 0, sub1->getPos());
 #ifdef RBNF_DEBUG
     fprintf(stderr, "doParse %x ", this);
     {
         UnicodeString rt;
         _appendRuleText(rt);
         dumpUS(stderr, rt);
     }
     fprintf(stderr, " text: '", this);
     dumpUS(stderr, text);
     fprintf(stderr, "' prefix: '");
     dumpUS(stderr, prefix);
 #endif
     stripPrefix(workText, prefix, pp);
     int32_t prefixLength = text.length() - workText.length();
 #ifdef RBNF_DEBUG
     fprintf(stderr, "' pl: %d ppi: %d s1p: %d\n", prefixLength, pp.getIndex(), sub1->getPos());
 #endif
     if (pp.getIndex() == 0 && sub1->getPos() != 0) {
         // commented out because ParsePosition doesn't have error index in 1.1.x
         // restored for ICU4C port
         parsePosition.setErrorIndex(pp.getErrorIndex());
         resVal.setLong(0);
         return TRUE;
     }
     // this is the fun part.  The basic guts of the rule-matching
     // logic is matchToDelimiter(), which is called twice.  The first
     // time it searches the input string for the rule text BETWEEN
     // the substitutions and tries to match the intervening text
     // in the input string with the first substitution.  If that
     // succeeds, it then calls it again, this time to look for the
     // rule text after the second substitution and to match the
     // intervening input text against the second substitution.
     //
     // For example, say we have a rule that looks like this:
     //    first << middle >> last;
     // and input text that looks like this:
     //    first one middle two last
     // First we use stripPrefix() to match "first " in both places and
     // strip it off the front, leaving
     //    one middle two last
     // Then we use matchToDelimiter() to match " middle " and try to
     // match "one" against a substitution.  If it's successful, we now
     // have
     //    two last
     // We use matchToDelimiter() a second time to match " last" and
     // try to match "two" against a substitution.  If "two" matches
     // the substitution, we have a successful parse.
     //
     // Since it's possible in many cases to find multiple instances
     // of each of these pieces of rule text in the input string,
     // we need to try all the possible combinations of these
     // locations.  This prevents us from prematurely declaring a mismatch,
     // and makes sure we match as much input text as we can.
     int highWaterMark = 0;
     double result = 0;
     int start = 0;
     double tempBaseValue = (double)(baseValue <= 0 ? 0 : baseValue);
     UnicodeString temp;
     do {
         // our partial parse result starts out as this rule's base
         // value.  If it finds a successful match, matchToDelimiter()
         // will compose this in some way with what it gets back from
         // the substitution, giving us a new partial parse result
         pp.setIndex(0);
         temp.setTo(ruleText, sub1->getPos(), sub2->getPos() - sub1->getPos());
         double partialResult = matchToDelimiter(workText, start, tempBaseValue,
             temp, pp, sub1,
             upperBound);
         // if we got a successful match (or were trying to match a
         // null substitution), pp is now pointing at the first unmatched
         // character.  Take note of that, and try matchToDelimiter()
         // on the input text again
         if (pp.getIndex() != 0 || sub1->isNullSubstitution()) {
             start = pp.getIndex();
             UnicodeString workText2;
             workText2.setTo(workText, pp.getIndex(), workText.length() - pp.getIndex());
             ParsePosition pp2;
             // the second matchToDelimiter() will compose our previous
             // partial result with whatever it gets back from its
             // substitution if there's a successful match, giving us
             // a real result
             temp.setTo(ruleText, sub2->getPos(), ruleText.length() - sub2->getPos());
             partialResult = matchToDelimiter(workText2, 0, partialResult,
                 temp, pp2, sub2,
                 upperBound);
             // if we got a successful match on this second
             // matchToDelimiter() call, update the high-water mark
             // and result (if necessary)
             if (pp2.getIndex() != 0 || sub2->isNullSubstitution()) {
                 if (prefixLength + pp.getIndex() + pp2.getIndex() > highWaterMark) {
                     highWaterMark = prefixLength + pp.getIndex() + pp2.getIndex();
                     result = partialResult;
                 }
             }
             // commented out because ParsePosition doesn't have error index in 1.1.x
             // restored for ICU4C port
             else {
                 int32_t temp = pp2.getErrorIndex() + sub1->getPos() + pp.getIndex();
                 if (temp> parsePosition.getErrorIndex()) {
                     parsePosition.setErrorIndex(temp);
                 }
             }
         }
         // commented out because ParsePosition doesn't have error index in 1.1.x
         // restored for ICU4C port
         else {
             int32_t temp = sub1->getPos() + pp.getErrorIndex();
             if (temp > parsePosition.getErrorIndex()) {
                 parsePosition.setErrorIndex(temp);
             }
         }
         // keep trying to match things until the outer matchToDelimiter()
         // call fails to make a match (each time, it picks up where it
         // left off the previous time)
     } while (sub1->getPos() != sub2->getPos()
         && pp.getIndex() > 0
         && pp.getIndex() < workText.length()
         && pp.getIndex() != start);
     // update the caller's ParsePosition with our high-water mark
     // (i.e., it now points at the first character this function
     // didn't match-- the ParsePosition is therefore unchanged if
     // we didn't match anything)
     parsePosition.setIndex(highWaterMark);
     // commented out because ParsePosition doesn't have error index in 1.1.x
     // restored for ICU4C port
     if (highWaterMark > 0) {
         parsePosition.setErrorIndex(0);
     }
     // this is a hack for one unusual condition: Normally, whether this
     // rule belong to a fraction rule set or not is handled by its
     // substitutions.  But if that rule HAS NO substitutions, then
     // we have to account for it here.  By definition, if the matching
     // rule in a fraction rule set has no substitutions, its numerator
     // is 1, and so the result is the reciprocal of its base value.
     if (isFractionRule &&
         highWaterMark > 0 &&
         sub1->isNullSubstitution()) {
         result = 1 / result;
     }
     resVal.setDouble(result);
     return TRUE; // ??? do we need to worry if it is a long or a double?
 }
 /**
 * This function is used by parse() to match the text being parsed
 * against a possible prefix string.  This function
 * matches characters from the beginning of the string being parsed
 * to characters from the prospective prefix.  If they match, pp is
 * updated to the first character not matched, and the result is
 * the unparsed part of the string.  If they don't match, the whole
 * string is returned, and pp is left unchanged.
 * @param text The string being parsed
 * @param prefix The text to match against
 * @param pp On entry, ignored and assumed to be 0.  On exit, points
 * to the first unmatched character (assuming the whole prefix matched),
 * or is unchanged (if the whole prefix didn't match).
 * @return If things match, this is the unparsed part of "text";
 * if they didn't match, this is "text".
 */
 void
 NFRule::stripPrefix(UnicodeString& text, const UnicodeString& prefix, ParsePosition& pp) const
 {
     // if the prefix text is empty, dump out without doing anything
     if (prefix.length() != 0) {
     	UErrorCode status = U_ZERO_ERROR;
         // use prefixLength() to match the beginning of
         // "text" against "prefix".  This function returns the
         // number of characters from "text" that matched (or 0 if
         // we didn't match the whole prefix)
         int32_t pfl = prefixLength(text, prefix, status);
         if (U_FAILURE(status)) { // Memory allocation error.
         	return;
         }
         if (pfl != 0) {
             // if we got a successful match, update the parse position
             // and strip the prefix off of "text"
             pp.setIndex(pp.getIndex() + pfl);
             text.remove(0, pfl);
         }
     }
 }
 /**
 * Used by parse() to match a substitution and any following text.
 * "text" is searched for instances of "delimiter".  For each instance
 * of delimiter, the intervening text is tested to see whether it
 * matches the substitution.  The longest match wins.
 * @param text The string being parsed
 * @param startPos The position in "text" where we should start looking
 * for "delimiter".
 * @param baseValue A partial parse result (often the rule's base value),
 * which is combined with the result from matching the substitution
 * @param delimiter The string to search "text" for.
 * @param pp Ignored and presumed to be 0 on entry.  If there's a match,
 * on exit this will point to the first unmatched character.
 * @param sub If we find "delimiter" in "text", this substitution is used
 * to match the text between the beginning of the string and the
 * position of "delimiter."  (If "delimiter" is the empty string, then
 * this function just matches against this substitution and updates
 * everything accordingly.)
 * @param upperBound When matching the substitution, it will only
 * consider rules with base values lower than this value.
 * @return If there's a match, this is the result of composing
 * baseValue with the result of matching the substitution.  Otherwise,
 * this is new Long(0).  It's never null.  If the result is an integer,
 * this will be an instance of Long; otherwise, it's an instance of
 * Double.
 *
 * !!! note {dlf} in point of fact, in the java code the caller always converts
 * the result to a double, so we might as well return one.
 */
 double
 NFRule::matchToDelimiter(const UnicodeString& text,
                          int32_t startPos,
                          double _baseValue,
                          const UnicodeString& delimiter,
                          ParsePosition& pp,
                          const NFSubstitution* sub,
                          double upperBound) const
 {
 	UErrorCode status = U_ZERO_ERROR;
     // if "delimiter" contains real (i.e., non-ignorable) text, search
     // it for "delimiter" beginning at "start".  If that succeeds, then
     // use "sub"'s doParse() method to match the text before the
     // instance of "delimiter" we just found.
     if (!allIgnorable(delimiter, status)) {
     	if (U_FAILURE(status)) { //Memory allocation error.
     		return 0;
     	}
         ParsePosition tempPP;
         Formattable result;
         // use findText() to search for "delimiter".  It returns a two-
         // element array: element 0 is the position of the match, and
         // element 1 is the number of characters that matched
         // "delimiter".
         int32_t dLen;
         int32_t dPos = findText(text, delimiter, startPos, &dLen);
         // if findText() succeeded, isolate the text preceding the
         // match, and use "sub" to match that text
         while (dPos >= 0) {
             UnicodeString subText;
             subText.setTo(text, 0, dPos);
             if (subText.length() > 0) {
                 UBool success = sub->doParse(subText, tempPP, _baseValue, upperBound,
 #if UCONFIG_NO_COLLATION
                     FALSE,
 #else
                     formatter->isLenient(),
 #endif
                     result);
                 // if the substitution could match all the text up to
                 // where we found "delimiter", then this function has
                 // a successful match.  Bump the caller's parse position
                 // to point to the first character after the text
                 // that matches "delimiter", and return the result
                 // we got from parsing the substitution.
                 if (success && tempPP.getIndex() == dPos) {
                     pp.setIndex(dPos + dLen);
                     return result.getDouble();
                 }
                 // commented out because ParsePosition doesn't have error index in 1.1.x
                 // restored for ICU4C port
                 else {
                     if (tempPP.getErrorIndex() > 0) {
                         pp.setErrorIndex(tempPP.getErrorIndex());
                     } else {
                         pp.setErrorIndex(tempPP.getIndex());
                     }
                 }
             }
             // if we didn't match the substitution, search for another
             // copy of "delimiter" in "text" and repeat the loop if
             // we find it
             tempPP.setIndex(0);
             dPos = findText(text, delimiter, dPos + dLen, &dLen);
         }
         // if we make it here, this was an unsuccessful match, and we
         // leave pp unchanged and return 0
         pp.setIndex(0);
         return 0;
         // if "delimiter" is empty, or consists only of ignorable characters
         // (i.e., is semantically empty), thwe we obviously can't search
         // for "delimiter".  Instead, just use "sub" to parse as much of
         // "text" as possible.
     } else {
         ParsePosition tempPP;
         Formattable result;
         // try to match the whole string against the substitution
         UBool success = sub->doParse(text, tempPP, _baseValue, upperBound,
 #if UCONFIG_NO_COLLATION
             FALSE,
 #else
             formatter->isLenient(),
 #endif
             result);
         if (success && (tempPP.getIndex() != 0 || sub->isNullSubstitution())) {
             // if there's a successful match (or it's a null
             // substitution), update pp to point to the first
             // character we didn't match, and pass the result from
             // sub.doParse() on through to the caller
             pp.setIndex(tempPP.getIndex());
             return result.getDouble();
         }
         // commented out because ParsePosition doesn't have error index in 1.1.x
         // restored for ICU4C port
         else {
             pp.setErrorIndex(tempPP.getErrorIndex());
         }
         // and if we get to here, then nothing matched, so we return
         // 0 and leave pp alone
         return 0;
     }
 }
 /**
 * Used by stripPrefix() to match characters.  If lenient parse mode
 * is off, this just calls startsWith().  If lenient parse mode is on,
 * this function uses CollationElementIterators to match characters in
 * the strings (only primary-order differences are significant in
 * determining whether there's a match).
 * @param str The string being tested
 * @param prefix The text we're hoping to see at the beginning
 * of "str"
 * @return If "prefix" is found at the beginning of "str", this
 * is the number of characters in "str" that were matched (this
 * isn't necessarily the same as the length of "prefix" when matching
 * text with a collator).  If there's no match, this is 0.
 */
 int32_t
 NFRule::prefixLength(const UnicodeString& str, const UnicodeString& prefix, UErrorCode& status) const
 {
     // if we're looking for an empty prefix, it obviously matches
     // zero characters.  Just go ahead and return 0.
     if (prefix.length() == 0) {
         return 0;
     }
 #if !UCONFIG_NO_COLLATION
     // go through all this grief if we're in lenient-parse mode
     if (formatter->isLenient()) {
         // get the formatter's collator and use it to create two
         // collation element iterators, one over the target string
         // and another over the prefix (right now, we'll throw an
         // exception if the collator we get back from the formatter
         // isn't a RuleBasedCollator, because RuleBasedCollator defines
         // the CollationElementIterator protocol.  Hopefully, this
         // will change someday.)
         RuleBasedCollator* collator = (RuleBasedCollator*)formatter->getCollator();
         CollationElementIterator* strIter = collator->createCollationElementIterator(str);
         CollationElementIterator* prefixIter = collator->createCollationElementIterator(prefix);
         // Check for memory allocation error.
         if (collator == NULL || strIter == NULL || prefixIter == NULL) {
         	delete collator;
         	delete strIter;
         	delete prefixIter;
         	status = U_MEMORY_ALLOCATION_ERROR;
         	return 0;
         }
         UErrorCode err = U_ZERO_ERROR;
         // The original code was problematic.  Consider this match:
         // prefix = "fifty-"
         // string = " fifty-7"
         // The intent is to match string up to the '7', by matching 'fifty-' at position 1
         // in the string.  Unfortunately, we were getting a match, and then computing where
         // the match terminated by rematching the string.  The rematch code was using as an
         // initial guess the substring of string between 0 and prefix.length.  Because of
         // the leading space and trailing hyphen (both ignorable) this was succeeding, leaving
         // the position before the hyphen in the string.  Recursing down, we then parsed the
         // remaining string '-7' as numeric.  The resulting number turned out as 43 (50 - 7).
         // This was not pretty, especially since the string "fifty-7" parsed just fine.
         //
         // We have newer APIs now, so we can use calls on the iterator to determine what we
         // matched up to.  If we terminate because we hit the last element in the string,
         // our match terminates at this length.  If we terminate because we hit the last element
         // in the target, our match terminates at one before the element iterator position.
         // match collation elements between the strings
         int32_t oStr = strIter->next(err);
         int32_t oPrefix = prefixIter->next(err);
         while (oPrefix != CollationElementIterator::NULLORDER) {
             // skip over ignorable characters in the target string
             while (CollationElementIterator::primaryOrder(oStr) == 0
                 && oStr != CollationElementIterator::NULLORDER) {
                 oStr = strIter->next(err);
             }
             // skip over ignorable characters in the prefix
             while (CollationElementIterator::primaryOrder(oPrefix) == 0
                 && oPrefix != CollationElementIterator::NULLORDER) {
                 oPrefix = prefixIter->next(err);
             }
             // dlf: move this above following test, if we consume the
             // entire target, aren't we ok even if the source was also
             // entirely consumed?
             // if skipping over ignorables brought to the end of
             // the prefix, we DID match: drop out of the loop
             if (oPrefix == CollationElementIterator::NULLORDER) {
                 break;
             }
             // if skipping over ignorables brought us to the end
             // of the target string, we didn't match and return 0
             if (oStr == CollationElementIterator::NULLORDER) {
                 delete prefixIter;
                 delete strIter;
                 return 0;
             }
             // match collation elements from the two strings
             // (considering only primary differences).  If we
             // get a mismatch, dump out and return 0
             if (CollationElementIterator::primaryOrder(oStr)
                 != CollationElementIterator::primaryOrder(oPrefix)) {
                 delete prefixIter;
                 delete strIter;
                 return 0;
                 // otherwise, advance to the next character in each string
                 // and loop (we drop out of the loop when we exhaust
                 // collation elements in the prefix)
             } else {
                 oStr = strIter->next(err);
                 oPrefix = prefixIter->next(err);
             }
         }
         int32_t result = strIter->getOffset();
         if (oStr != CollationElementIterator::NULLORDER) {
             --result; // back over character that we don't want to consume;
         }
 #ifdef RBNF_DEBUG
         fprintf(stderr, "prefix length: %d\n", result);
 #endif
         delete prefixIter;
         delete strIter;
         return result;
 #if 0
         //----------------------------------------------------------------
         // JDK 1.2-specific API call
         // return strIter.getOffset();
         //----------------------------------------------------------------
         // JDK 1.1 HACK (take out for 1.2-specific code)
         // if we make it to here, we have a successful match.  Now we
         // have to find out HOW MANY characters from the target string
         // matched the prefix (there isn't necessarily a one-to-one
         // mapping between collation elements and characters).
         // In JDK 1.2, there's a simple getOffset() call we can use.
         // In JDK 1.1, on the other hand, we have to go through some
         // ugly contortions.  First, use the collator to compare the
         // same number of characters from the prefix and target string.
         // If they're equal, we're done.
         collator->setStrength(Collator::PRIMARY);
         if (str.length() >= prefix.length()) {
             UnicodeString temp;
             temp.setTo(str, 0, prefix.length());
             if (collator->equals(temp, prefix)) {
 #ifdef RBNF_DEBUG
                 fprintf(stderr, "returning: %d\n", prefix.length());
 #endif
                 return prefix.length();
             }
         }
         // if they're not equal, then we have to compare successively
         // larger and larger substrings of the target string until we
         // get to one that matches the prefix.  At that point, we know
         // how many characters matched the prefix, and we can return.
         int32_t p = 1;
         while (p <= str.length()) {
             UnicodeString temp;
             temp.setTo(str, 0, p);
             if (collator->equals(temp, prefix)) {
                 return p;
             } else {
                 ++p;
             }
         }
         // SHOULD NEVER GET HERE!!!
         return 0;
         //----------------------------------------------------------------
 #endif
         // If lenient parsing is turned off, forget all that crap above.
         // Just use String.startsWith() and be done with it.
   } else
 #endif
   {
       if (str.startsWith(prefix)) {
           return prefix.length();
       } else {
           return 0;
       }
   }
 }
 /**
 * Searches a string for another string.  If lenient parsing is off,
 * this just calls indexOf().  If lenient parsing is on, this function
 * uses CollationElementIterator to match characters, and only
 * primary-order differences are significant in determining whether
 * there's a match.
 * @param str The string to search
 * @param key The string to search "str" for
 * @param startingAt The index into "str" where the search is to
 * begin
 * @return A two-element array of ints.  Element 0 is the position
 * of the match, or -1 if there was no match.  Element 1 is the
 * number of characters in "str" that matched (which isn't necessarily
 * the same as the length of "key")
 */
 int32_t
 NFRule::findText(const UnicodeString& str,
                  const UnicodeString& key,
                  int32_t startingAt,
                  int32_t* length) const
 {
 #if !UCONFIG_NO_COLLATION
     // if lenient parsing is turned off, this is easy: just call
     // String.indexOf() and we're done
     if (!formatter->isLenient()) {
         *length = key.length();
         return str.indexOf(key, startingAt);
         // but if lenient parsing is turned ON, we've got some work
         // ahead of us
     } else
 #endif
     {
         //----------------------------------------------------------------
         // JDK 1.1 HACK (take out of 1.2-specific code)
         // in JDK 1.2, CollationElementIterator provides us with an
         // API to map between character offsets and collation elements
         // and we can do this by marching through the string comparing
         // collation elements.  We can't do that in JDK 1.1.  Insted,
         // we have to go through this horrible slow mess:
         int32_t p = startingAt;
         int32_t keyLen = 0;
         // basically just isolate smaller and smaller substrings of
         // the target string (each running to the end of the string,
         // and with the first one running from startingAt to the end)
         // and then use prefixLength() to see if the search key is at
         // the beginning of each substring.  This is excruciatingly
         // slow, but it will locate the key and tell use how long the
         // matching text was.
         UnicodeString temp;
         UErrorCode status = U_ZERO_ERROR;
         while (p < str.length() && keyLen == 0) {
             temp.setTo(str, p, str.length() - p);
             keyLen = prefixLength(temp, key, status);
             if (U_FAILURE(status)) {
             	break;
             }
             if (keyLen != 0) {
                 *length = keyLen;
                 return p;
             }
             ++p;
         }
         // if we make it to here, we didn't find it.  Return -1 for the
         // location.  The length should be ignored, but set it to 0,
         // which should be "safe"
         *length = 0;
         return -1;
         //----------------------------------------------------------------
         // JDK 1.2 version of this routine
         //RuleBasedCollator collator = (RuleBasedCollator)formatter.getCollator();
         //
         //CollationElementIterator strIter = collator.getCollationElementIterator(str);
         //CollationElementIterator keyIter = collator.getCollationElementIterator(key);
         //
         //int keyStart = -1;
         //
         //str.setOffset(startingAt);
         //
         //int oStr = strIter.next();
         //int oKey = keyIter.next();
         //while (oKey != CollationElementIterator.NULLORDER) {
         //    while (oStr != CollationElementIterator.NULLORDER &&
         //                CollationElementIterator.primaryOrder(oStr) == 0)
         //        oStr = strIter.next();
         //
         //    while (oKey != CollationElementIterator.NULLORDER &&
         //                CollationElementIterator.primaryOrder(oKey) == 0)
         //        oKey = keyIter.next();
         //
         //    if (oStr == CollationElementIterator.NULLORDER) {
         //        return new int[] { -1, 0 };
         //    }
         //
         //    if (oKey == CollationElementIterator.NULLORDER) {
         //        break;
         //    }
         //
         //    if (CollationElementIterator.primaryOrder(oStr) ==
         //            CollationElementIterator.primaryOrder(oKey)) {
         //        keyStart = strIter.getOffset();
         //        oStr = strIter.next();
         //        oKey = keyIter.next();
         //    } else {
         //        if (keyStart != -1) {
         //            keyStart = -1;
         //            keyIter.reset();
         //        } else {
         //            oStr = strIter.next();
         //        }
         //    }
         //}
         //
         //if (oKey == CollationElementIterator.NULLORDER) {
         //    return new int[] { keyStart, strIter.getOffset() - keyStart };
         //} else {
         //    return new int[] { -1, 0 };
         //}
     }
 }
 /**
 * Checks to see whether a string consists entirely of ignorable
 * characters.
 * @param str The string to test.
 * @return true if the string is empty of consists entirely of
 * characters that the number formatter's collator says are
 * ignorable at the primary-order level.  false otherwise.
 */
 UBool
 NFRule::allIgnorable(const UnicodeString& str, UErrorCode& status) const
 {
     // if the string is empty, we can just return true
     if (str.length() == 0) {
         return TRUE;
     }
 #if !UCONFIG_NO_COLLATION
     // if lenient parsing is turned on, walk through the string with
     // a collation element iterator and make sure each collation
     // element is 0 (ignorable) at the primary level
     if (formatter->isLenient()) {
         RuleBasedCollator* collator = (RuleBasedCollator*)(formatter->getCollator());
         CollationElementIterator* iter = collator->createCollationElementIterator(str);
         // Memory allocation error check.
         if (collator == NULL || iter == NULL) {
         	delete collator;
         	delete iter;
         	status = U_MEMORY_ALLOCATION_ERROR;
         	return FALSE;
         }
         UErrorCode err = U_ZERO_ERROR;
         int32_t o = iter->next(err);
         while (o != CollationElementIterator::NULLORDER
             && CollationElementIterator::primaryOrder(o) == 0) {
             o = iter->next(err);
         }
         delete iter;
         return o == CollationElementIterator::NULLORDER;
     }
 #endif
     // if lenient parsing is turned off, there is no such thing as
     // an ignorable character: return true only if the string is empty
     return FALSE;
 }
 U_NAMESPACE_END
 /* U_HAVE_RBNF */
 #endif

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intl/icu/source/i18n/nfrule.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/nfrule.cpp