686 lines
22 KiB
C++
686 lines
22 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 1997-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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******************************************************************************
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* file name: nfrs.cpp
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* Modification history
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* Date Name Comments
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* 10/11/2001 Doug Ported from ICU4J
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*/
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#include "nfrs.h"
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#include "nfrule.h"
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#include "nfrlist.h"
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#include "unicode/uchar.h"
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#ifdef RBNF_DEBUG
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#include "cmemory.h"
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#endif
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U_NAMESPACE_BEGIN
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#if 0
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// euclid's algorithm works with doubles
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// note, doubles only get us up to one quadrillion or so, which
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// isn't as much range as we get with longs. We probably still
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// want either 64-bit math, or BigInteger.
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static llong
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util_lcm(llong x, llong y)
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{
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x.abs();
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y.abs();
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if (x == 0 || y == 0) {
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return 0;
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} else {
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do {
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if (x < y) {
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llong t = x; x = y; y = t;
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}
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x -= y * (x/y);
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} while (x != 0);
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return y;
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}
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}
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#else
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/**
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* Calculates the least common multiple of x and y.
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*/
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static llong
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util_lcm(llong x, llong y)
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{
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// binary gcd algorithm from Knuth, "The Art of Computer Programming,"
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// vol. 2, 1st ed., pp. 298-299
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llong x1 = x;
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llong y1 = y;
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int p2 = 0;
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while ((x1 & 1) == 0 && (y1 & 1) == 0) {
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++p2;
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x1 >>= 1;
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y1 >>= 1;
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}
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llong t;
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if ((x1 & 1) == 1) {
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t = -y1;
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} else {
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t = x1;
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}
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while (t != 0) {
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while ((t & 1) == 0) {
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t >>= 1;
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}
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if (t > 0) {
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x1 = t;
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} else {
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y1 = -t;
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}
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t = x1 - y1;
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}
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llong gcd = x1 << p2;
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// x * y == gcd(x, y) * lcm(x, y)
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return x / gcd * y;
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}
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#endif
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static const UChar gPercent = 0x0025;
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static const UChar gColon = 0x003a;
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static const UChar gSemicolon = 0x003b;
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static const UChar gLineFeed = 0x000a;
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static const UChar gFourSpaces[] =
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{
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0x20, 0x20, 0x20, 0x20, 0
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}; /* " " */
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static const UChar gPercentPercent[] =
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{
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0x25, 0x25, 0
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}; /* "%%" */
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NFRuleSet::NFRuleSet(UnicodeString* descriptions, int32_t index, UErrorCode& status)
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: name()
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, rules(0)
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, negativeNumberRule(NULL)
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, fIsFractionRuleSet(FALSE)
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, fIsPublic(FALSE)
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{
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for (int i = 0; i < 3; ++i) {
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fractionRules[i] = NULL;
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}
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if (U_FAILURE(status)) {
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return;
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}
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UnicodeString& description = descriptions[index]; // !!! make sure index is valid
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// if the description begins with a rule set name (the rule set
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// name can be omitted in formatter descriptions that consist
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// of only one rule set), copy it out into our "name" member
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// and delete it from the description
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if (description.charAt(0) == gPercent) {
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UTextOffset pos = description.indexOf(gColon);
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if (pos == -1) {
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// throw new IllegalArgumentException("Rule set name doesn't end in colon");
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status = U_PARSE_ERROR;
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} else {
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name.setTo(description, 0, pos);
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while (pos < description.length() && u_isWhitespace(description.charAt(++pos))) {
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}
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description.remove(0, pos);
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}
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} else {
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name.setTo("%default");
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}
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if (description.length() == 0) {
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// throw new IllegalArgumentException("Empty rule set description");
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status = U_PARSE_ERROR;
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}
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fIsPublic = name.indexOf(gPercentPercent) != 0;
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// all of the other members of NFRuleSet are initialized
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// by parseRules()
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}
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void
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NFRuleSet::parseRules(UnicodeString& description, const RuleBasedNumberFormat* owner, UErrorCode& status)
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{
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// start by creating a Vector whose elements are Strings containing
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// the descriptions of the rules (one rule per element). The rules
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// are separated by semicolons (there's no escape facility: ALL
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// semicolons are rule delimiters)
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if (U_FAILURE(status)) {
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return;
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}
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// dlf - the original code kept a separate description array for no reason,
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// so I got rid of it. The loop was too complex so I simplified it.
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UnicodeString currentDescription;
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UTextOffset oldP = 0;
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while (oldP < description.length()) {
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UTextOffset p = description.indexOf(gSemicolon, oldP);
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if (p == -1) {
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p = description.length();
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}
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currentDescription.setTo(description, oldP, p - oldP);
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NFRule::makeRules(currentDescription, this, rules.last(), owner, rules, status);
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oldP = p + 1;
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}
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// for rules that didn't specify a base value, their base values
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// were initialized to 0. Make another pass through the list and
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// set all those rules' base values. We also remove any special
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// rules from the list and put them into their own member variables
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llong defaultBaseValue = (int32_t)0;
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// (this isn't a for loop because we might be deleting items from
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// the vector-- we want to make sure we only increment i when
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// we _didn't_ delete aything from the vector)
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uint32_t i = 0;
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while (i < rules.size()) {
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NFRule* rule = rules[i];
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switch (rule->getType()) {
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// if the rule's base value is 0, fill in a default
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// base value (this will be 1 plus the preceding
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// rule's base value for regular rule sets, and the
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// same as the preceding rule's base value in fraction
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// rule sets)
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case NFRule::kNoBase:
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rule->setBaseValue(defaultBaseValue);
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if (!isFractionRuleSet()) {
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++defaultBaseValue;
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}
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++i;
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break;
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// if it's the negative-number rule, copy it into its own
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// data member and delete it from the list
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case NFRule::kNegativeNumberRule:
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negativeNumberRule = rules.remove(i);
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break;
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// if it's the improper fraction rule, copy it into the
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// correct element of fractionRules
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case NFRule::kImproperFractionRule:
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fractionRules[0] = rules.remove(i);
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break;
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// if it's the proper fraction rule, copy it into the
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// correct element of fractionRules
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case NFRule::kProperFractionRule:
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fractionRules[1] = rules.remove(i);
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break;
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// if it's the master rule, copy it into the
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// correct element of fractionRules
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case NFRule::kMasterRule:
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fractionRules[2] = rules.remove(i);
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break;
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// if it's a regular rule that already knows its base value,
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// check to make sure the rules are in order, and update
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// the default base value for the next rule
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default:
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if (rule->getBaseValue() < defaultBaseValue) {
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// throw new IllegalArgumentException("Rules are not in order");
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status = U_PARSE_ERROR;
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return;
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}
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defaultBaseValue = rule->getBaseValue();
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if (!isFractionRuleSet()) {
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++defaultBaseValue;
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}
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++i;
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break;
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}
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}
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}
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NFRuleSet::~NFRuleSet()
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{
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delete negativeNumberRule;
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delete fractionRules[0];
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delete fractionRules[1];
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delete fractionRules[2];
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}
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UBool
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util_equalRules(const NFRule* rule1, const NFRule* rule2)
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{
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if (rule1) {
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if (rule2) {
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return *rule1 == *rule2;
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}
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} else if (!rule2) {
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return TRUE;
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}
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return FALSE;
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}
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UBool
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NFRuleSet::operator==(const NFRuleSet& rhs) const
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{
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if (rules.size() == rhs.rules.size() &&
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fIsFractionRuleSet == rhs.fIsFractionRuleSet &&
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name == rhs.name &&
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util_equalRules(negativeNumberRule, rhs.negativeNumberRule) &&
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util_equalRules(fractionRules[0], rhs.fractionRules[0]) &&
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util_equalRules(fractionRules[1], rhs.fractionRules[1]) &&
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util_equalRules(fractionRules[2], rhs.fractionRules[2])) {
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for (uint32_t i = 0; i < rules.size(); ++i) {
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if (*rules[i] != *rhs.rules[i]) {
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return FALSE;
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}
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}
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return TRUE;
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}
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return FALSE;
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}
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void
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NFRuleSet::format(llong number, UnicodeString& toAppendTo, int32_t pos) const
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{
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NFRule *rule = findNormalRule(number);
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rule->doFormat(number, toAppendTo, pos);
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}
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void
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NFRuleSet::format(double number, UnicodeString& toAppendTo, int32_t pos) const
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{
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NFRule *rule = findDoubleRule(number);
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rule->doFormat(number, toAppendTo, pos);
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}
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NFRule*
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NFRuleSet::findDoubleRule(double number) const
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{
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// if this is a fraction rule set, use findFractionRuleSetRule()
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if (isFractionRuleSet()) {
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return findFractionRuleSetRule(number);
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}
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// if the number is negative, return the negative number rule
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// (if there isn't a negative-number rule, we pretend it's a
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// positive number)
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if (number < 0) {
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if (negativeNumberRule) {
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return negativeNumberRule;
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} else {
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number = -number;
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}
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}
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// if the number isn't an integer, we use one of the fraction rules...
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if (number != uprv_floor(number)) {
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// if the number is between 0 and 1, return the proper
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// fraction rule
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if (number < 1 && fractionRules[1]) {
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return fractionRules[1];
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}
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// otherwise, return the improper fraction rule
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else if (fractionRules[0]) {
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return fractionRules[0];
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}
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}
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// if there's a master rule, use it to format the number
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if (fractionRules[2]) {
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return fractionRules[2];
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}
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// and if we haven't yet returned a rule, use findNormalRule()
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// to find the applicable rule
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llong r = number + 0.5;
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return findNormalRule(r);
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}
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NFRule *
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NFRuleSet::findNormalRule(llong number) const
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{
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// if this is a fraction rule set, use findFractionRuleSetRule()
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// to find the rule (we should only go into this clause if the
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// value is 0)
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if (fIsFractionRuleSet) {
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return findFractionRuleSetRule(number.asDouble());
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}
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// if the number is negative, return the negative-number rule
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// (if there isn't one, pretend the number is positive)
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if (number < 0) {
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if (negativeNumberRule) {
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return negativeNumberRule;
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} else {
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number = -number;
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}
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}
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// we have to repeat the preceding two checks, even though we
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// do them in findRule(), because the version of format() that
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// takes a long bypasses findRule() and goes straight to this
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// function. This function does skip the fraction rules since
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// we know the value is an integer (it also skips the master
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// rule, since it's considered a fraction rule. Skipping the
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// master rule in this function is also how we avoid infinite
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// recursion)
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// {dlf} unfortunately this fails if there are no rules except
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// special rules. If there are no rules, use the master rule.
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// binary-search the rule list for the applicable rule
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// (a rule is used for all values from its base value to
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// the next rule's base value)
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int32_t hi = rules.size();
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if (hi > 0) {
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int32_t lo = 0;
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while (lo < hi) {
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int32_t mid = (lo + hi) / 2;
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if (rules[mid]->getBaseValue() == number) {
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return rules[mid];
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}
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else if (rules[mid]->getBaseValue() > number) {
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hi = mid;
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}
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else {
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lo = mid + 1;
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}
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}
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NFRule *result = rules[hi - 1];
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// use shouldRollBack() to see whether we need to invoke the
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// rollback rule (see shouldRollBack()'s documentation for
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// an explanation of the rollback rule). If we do, roll back
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// one rule and return that one instead of the one we'd normally
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// return
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if (result->shouldRollBack(number.asDouble())) {
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result = rules[hi - 2];
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}
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return result;
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}
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// else use the master rule
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return fractionRules[2];
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}
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/**
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* If this rule is a fraction rule set, this function is used by
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* findRule() to select the most appropriate rule for formatting
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* the number. Basically, the base value of each rule in the rule
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* set is treated as the denominator of a fraction. Whichever
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* denominator can produce the fraction closest in value to the
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* number passed in is the result. If there's a tie, the earlier
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* one in the list wins. (If there are two rules in a row with the
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* same base value, the first one is used when the numerator of the
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* fraction would be 1, and the second rule is used the rest of the
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* time.
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* @param number The number being formatted (which will always be
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* a number between 0 and 1)
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* @return The rule to use to format this number
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*/
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NFRule*
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NFRuleSet::findFractionRuleSetRule(double number) const
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{
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// the obvious way to do this (multiply the value being formatted
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// by each rule's base value until you get an integral result)
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// doesn't work because of rounding error. This method is more
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// accurate
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// find the least common multiple of the rules' base values
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// and multiply this by the number being formatted. This is
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// all the precision we need, and we can do all of the rest
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// of the math using integer arithmetic
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llong leastCommonMultiple = rules[0]->getBaseValue();
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llong numerator;
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{
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for (uint32_t i = 1; i < rules.size(); ++i) {
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leastCommonMultiple = util_lcm(leastCommonMultiple, rules[i]->getBaseValue());
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}
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numerator = number * leastCommonMultiple.asDouble() + 0.5;
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}
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// for each rule, do the following...
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llong tempDifference;
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llong difference(uprv_maxMantissa());
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int32_t winner = 0;
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for (uint32_t i = 0; i < rules.size(); ++i) {
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// "numerator" is the numerator of the fraction if the
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// denominator is the LCD. The numerator if the rule's
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// base value is the denominator is "numerator" times the
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// base value divided bythe LCD. Here we check to see if
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// that's an integer, and if not, how close it is to being
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// an integer.
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tempDifference = numerator * rules[i]->getBaseValue() % leastCommonMultiple;
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// normalize the result of the above calculation: we want
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// the numerator's distance from the CLOSEST multiple
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// of the LCD
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if (leastCommonMultiple - tempDifference < tempDifference) {
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tempDifference = leastCommonMultiple - tempDifference;
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}
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// if this is as close as we've come, keep track of how close
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// that is, and the line number of the rule that did it. If
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// we've scored a direct hit, we don't have to look at any more
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// rules
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if (tempDifference < difference) {
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difference = tempDifference;
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winner = i;
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if (difference == 0) {
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break;
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}
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}
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}
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// if we have two successive rules that both have the winning base
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// value, then the first one (the one we found above) is used if
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// the numerator of the fraction is 1 and the second one is used if
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// the numerator of the fraction is anything else (this lets us
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// do things like "one third"/"two thirds" without haveing to define
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// a whole bunch of extra rule sets)
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if ((unsigned)(winner + 1) < rules.size() &&
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rules[winner + 1]->getBaseValue() == rules[winner]->getBaseValue()) {
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double n = rules[winner]->getBaseValue().asDouble() * number;
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if (n < 0.5 || n >= 2) {
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++winner;
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}
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}
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// finally, return the winning rule
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return rules[winner];
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}
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/**
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* Parses a string. Matches the string to be parsed against each
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* of its rules (with a base value less than upperBound) and returns
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* the value produced by the rule that matched the most charcters
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* in the source string.
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* @param text The string to parse
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* @param parsePosition The initial position is ignored and assumed
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* to be 0. On exit, this object has been updated to point to the
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* first character position this rule set didn't consume.
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* @param upperBound Limits the rules that can be allowed to match.
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* Only rules whose base values are strictly less than upperBound
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* are considered.
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* @return The numerical result of parsing this string. This will
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* be the matching rule's base value, composed appropriately with
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* the results of matching any of its substitutions. The object
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* will be an instance of Long if it's an integral value; otherwise,
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* it will be an instance of Double. This function always returns
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* a valid object: If nothing matched the input string at all,
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* this function returns new Long(0), and the parse position is
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* left unchanged.
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*/
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#ifdef RBNF_DEBUG
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#include <stdio.h>
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static void dumpUS(FILE* f, const UnicodeString& us) {
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int len = us.length();
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char* buf = new char[len+1];
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|
us.extract(0, len, buf);
|
|
buf[len] = 0;
|
|
fprintf(f, "%s", buf);
|
|
delete[] buf;
|
|
}
|
|
#endif
|
|
|
|
UBool
|
|
NFRuleSet::parse(const UnicodeString& text, ParsePosition& pos, double upperBound, Formattable& result) const
|
|
{
|
|
// try matching each rule in the rule set against the text being
|
|
// parsed. Whichever one matches the most characters is the one
|
|
// that determines the value we return.
|
|
|
|
result.setLong(0);
|
|
|
|
// dump out if there's no text to parse
|
|
if (text.length() == 0) {
|
|
return 0;
|
|
}
|
|
|
|
ParsePosition highWaterMark;
|
|
ParsePosition workingPos = pos;
|
|
|
|
#ifdef RBNF_DEBUG
|
|
fprintf(stderr, "<nfrs> %x '", this);
|
|
dumpUS(stderr, name);
|
|
fprintf(stderr, "' text '");
|
|
dumpUS(stderr, text);
|
|
fprintf(stderr, "'\n");
|
|
fprintf(stderr, " parse negative: %d\n", this, negativeNumberRule != 0);
|
|
#endif
|
|
|
|
// start by trying the negative number rule (if there is one)
|
|
if (negativeNumberRule) {
|
|
Formattable tempResult;
|
|
#ifdef RBNF_DEBUG
|
|
fprintf(stderr, " <nfrs before negative> %x ub: %g\n", negativeNumberRule, upperBound);
|
|
#endif
|
|
UBool success = negativeNumberRule->doParse(text, workingPos, 0, upperBound, tempResult);
|
|
#ifdef RBNF_DEBUG
|
|
fprintf(stderr, " <nfrs after negative> success: %d wpi: %d\n", success, workingPos.getIndex());
|
|
#endif
|
|
if (success && workingPos.getIndex() > highWaterMark.getIndex()) {
|
|
result = tempResult;
|
|
highWaterMark = workingPos;
|
|
}
|
|
workingPos = pos;
|
|
}
|
|
#ifdef RBNF_DEBUG
|
|
fprintf(stderr, "<nfrs> continue fractional with text '");
|
|
dumpUS(stderr, text);
|
|
fprintf(stderr, "' hwm: %d\n", highWaterMark.getIndex());
|
|
#endif
|
|
// then try each of the fraction rules
|
|
{
|
|
for (int i = 0; i < 3; i++) {
|
|
if (fractionRules[i]) {
|
|
Formattable tempResult;
|
|
UBool success = fractionRules[i]->doParse(text, workingPos, 0, upperBound, tempResult);
|
|
if (success && (workingPos.getIndex() > highWaterMark.getIndex())) {
|
|
result = tempResult;
|
|
highWaterMark = workingPos;
|
|
}
|
|
workingPos = pos;
|
|
}
|
|
}
|
|
}
|
|
#ifdef RBNF_DEBUG
|
|
fprintf(stderr, "<nfrs> continue other with text '");
|
|
dumpUS(stderr, text);
|
|
fprintf(stderr, "' hwm: %d\n", highWaterMark.getIndex());
|
|
#endif
|
|
|
|
// finally, go through the regular rules one at a time. We start
|
|
// at the end of the list because we want to try matching the most
|
|
// sigificant rule first (this helps ensure that we parse
|
|
// "five thousand three hundred six" as
|
|
// "(five thousand) (three hundred) (six)" rather than
|
|
// "((five thousand three) hundred) (six)"). Skip rules whose
|
|
// base values are higher than the upper bound (again, this helps
|
|
// limit ambiguity by making sure the rules that match a rule's
|
|
// are less significant than the rule containing the substitutions)/
|
|
{
|
|
llong ub(upperBound);
|
|
#ifdef RBNF_DEBUG
|
|
{
|
|
char ubstr[64];
|
|
ub.lltoa(ubstr, 64);
|
|
fprintf(stderr, "ub: %g, ll: %s(%x/%x)\n", upperBound, ubstr, ub.hi, ub.lo);
|
|
}
|
|
#endif
|
|
for (int32_t i = rules.size(); --i >= 0 && highWaterMark.getIndex() < text.length();) {
|
|
if ((!fIsFractionRuleSet) && (rules[i]->getBaseValue() >= ub)) {
|
|
continue;
|
|
}
|
|
Formattable tempResult;
|
|
UBool success = rules[i]->doParse(text, workingPos, fIsFractionRuleSet, upperBound, tempResult);
|
|
if (success && workingPos.getIndex() > highWaterMark.getIndex()) {
|
|
result = tempResult;
|
|
highWaterMark = workingPos;
|
|
}
|
|
workingPos = pos;
|
|
}
|
|
}
|
|
#ifdef RBNF_DEBUG
|
|
fprintf(stderr, "<nfrs> exit\n");
|
|
#endif
|
|
// finally, update the parse postion we were passed to point to the
|
|
// first character we didn't use, and return the result that
|
|
// corresponds to that string of characters
|
|
pos = highWaterMark;
|
|
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
NFRuleSet::appendRules(UnicodeString& result) const
|
|
{
|
|
// the rule set name goes first...
|
|
result.append(name);
|
|
result.append(gColon);
|
|
result.append(gLineFeed);
|
|
|
|
// followed by the regular rules...
|
|
for (uint32_t i = 0; i < rules.size(); i++) {
|
|
result.append(gFourSpaces);
|
|
rules[i]->appendRuleText(result);
|
|
result.append(gLineFeed);
|
|
}
|
|
|
|
// followed by the special rules (if they exist)
|
|
if (negativeNumberRule) {
|
|
result.append(gFourSpaces);
|
|
negativeNumberRule->appendRuleText(result);
|
|
result.append(gLineFeed);
|
|
}
|
|
|
|
{
|
|
for (uint32_t i = 0; i < 3; ++i) {
|
|
if (fractionRules[i]) {
|
|
result.append(gFourSpaces);
|
|
fractionRules[i]->appendRuleText(result);
|
|
result.append(gLineFeed);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
U_NAMESPACE_END
|