326 lines
12 KiB
C++
326 lines
12 KiB
C++
// © 2018 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING && !UPRV_INCOMPLETE_CPP11_SUPPORT
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// Allow implicit conversion from char16_t* to UnicodeString for this file:
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// Helpful in toString methods and elsewhere.
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#define UNISTR_FROM_STRING_EXPLICIT
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#include "numparse_types.h"
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#include "numparse_decimal.h"
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#include "numparse_unisets.h"
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#include "numparse_utils.h"
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#include "unicode/uchar.h"
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#include "putilimp.h"
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using namespace icu;
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using namespace icu::numparse;
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using namespace icu::numparse::impl;
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DecimalMatcher::DecimalMatcher(const DecimalFormatSymbols& symbols, const Grouper& grouper,
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parse_flags_t parseFlags) {
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if (0 != (parseFlags & PARSE_FLAG_MONETARY_SEPARATORS)) {
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groupingSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kMonetaryGroupingSeparatorSymbol);
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decimalSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kMonetarySeparatorSymbol);
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} else {
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groupingSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kGroupingSeparatorSymbol);
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decimalSeparator = symbols.getConstSymbol(DecimalFormatSymbols::kDecimalSeparatorSymbol);
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}
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bool strictSeparators = 0 != (parseFlags & PARSE_FLAG_STRICT_SEPARATORS);
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unisets::Key groupingKey = strictSeparators ? unisets::STRICT_ALL_SEPARATORS
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: unisets::ALL_SEPARATORS;
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// Attempt to find separators in the static cache
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groupingUniSet = unisets::get(groupingKey);
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unisets::Key decimalKey = unisets::chooseFrom(
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decimalSeparator,
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strictSeparators ? unisets::STRICT_COMMA : unisets::COMMA,
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strictSeparators ? unisets::STRICT_PERIOD : unisets::PERIOD);
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if (decimalKey != unisets::COUNT) {
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decimalUniSet = unisets::get(decimalKey);
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} else {
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auto* set = new UnicodeSet();
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set->add(decimalSeparator.char32At(0));
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set->freeze();
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decimalUniSet = set;
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fLocalDecimalUniSet.adoptInstead(set);
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}
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if (groupingKey != unisets::COUNT && decimalKey != unisets::COUNT) {
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// Everything is available in the static cache
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separatorSet = groupingUniSet;
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leadSet = unisets::get(
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strictSeparators ? unisets::DIGITS_OR_ALL_SEPARATORS
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: unisets::DIGITS_OR_STRICT_ALL_SEPARATORS);
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} else {
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auto* set = new UnicodeSet();
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set->addAll(*groupingUniSet);
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set->addAll(*decimalUniSet);
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set->freeze();
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separatorSet = set;
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fLocalSeparatorSet.adoptInstead(set);
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leadSet = nullptr;
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}
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int cpZero = symbols.getCodePointZero();
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if (cpZero == -1 || !u_isdigit(cpZero) || u_digit(cpZero, 10) != 0) {
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// Uncommon case: okay to allocate.
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auto digitStrings = new UnicodeString[10];
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fLocalDigitStrings.adoptInstead(digitStrings);
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for (int32_t i = 0; i <= 9; i++) {
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digitStrings[i] = symbols.getConstDigitSymbol(i);
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}
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}
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requireGroupingMatch = 0 != (parseFlags & PARSE_FLAG_STRICT_GROUPING_SIZE);
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groupingDisabled = 0 != (parseFlags & PARSE_FLAG_GROUPING_DISABLED);
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fractionGroupingDisabled = 0 != (
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parseFlags & PARSE_FLAG_FRACTION_GROUPING_DISABLED);
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integerOnly = 0 != (parseFlags & PARSE_FLAG_INTEGER_ONLY);
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grouping1 = grouper.getPrimary();
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grouping2 = grouper.getSecondary();
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}
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bool DecimalMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {
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return match(segment, result, 0, status);
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}
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bool DecimalMatcher::match(StringSegment& segment, ParsedNumber& result, int8_t exponentSign,
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UErrorCode&) const {
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if (result.seenNumber() && exponentSign == 0) {
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// A number has already been consumed.
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return false;
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} else if (exponentSign != 0) {
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// scientific notation always comes after the number
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U_ASSERT(!result.quantity.bogus);
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}
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ParsedNumber backupResult(result);
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// strict parsing
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bool strictFail = false; // did we exit with a strict parse failure?
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UnicodeString actualGroupingString = groupingSeparator;
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UnicodeString actualDecimalString = decimalSeparator;
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int32_t groupedDigitCount = 0; // tracking count of digits delimited by grouping separator
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int32_t backupOffset = -1; // used for preserving the last confirmed position
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bool afterFirstGrouping = false;
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bool seenGrouping = false;
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bool seenDecimal = false;
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int32_t digitsAfterDecimal = 0;
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int32_t initialOffset = segment.getOffset();
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int32_t exponent = 0;
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bool hasPartialPrefix = false;
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while (segment.length() > 0) {
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hasPartialPrefix = false;
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// Attempt to match a digit.
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int8_t digit = -1;
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// Try by code point digit value.
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int cp = segment.getCodePoint();
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if (u_isdigit(cp)) {
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segment.adjustOffset(U16_LENGTH(cp));
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digit = static_cast<int8_t>(u_digit(cp, 10));
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}
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// Try by digit string.
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if (digit == -1 && !fLocalDigitStrings.isNull()) {
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for (int i = 0; i < 10; i++) {
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const UnicodeString& str = fLocalDigitStrings[i];
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int overlap = segment.getCommonPrefixLength(str);
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if (overlap == str.length()) {
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segment.adjustOffset(overlap);
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digit = static_cast<int8_t>(i);
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break;
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} else if (overlap == segment.length()) {
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hasPartialPrefix = true;
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}
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}
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}
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if (digit >= 0) {
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// Digit was found.
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// Check for grouping size violation
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if (backupOffset != -1) {
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if (requireGroupingMatch) {
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// comma followed by digit, so group before comma is a secondary
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// group. If there was a group separator before that, the group
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// must == the secondary group length, else it can be <= the the
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// secondary group length.
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if ((afterFirstGrouping && groupedDigitCount != grouping2) ||
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(!afterFirstGrouping && groupedDigitCount > grouping2)) {
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strictFail = true;
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break;
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}
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}
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afterFirstGrouping = true;
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backupOffset = -1;
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groupedDigitCount = 0;
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}
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// Save the digit in the DecimalQuantity or scientific adjustment.
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if (exponentSign != 0) {
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int32_t nextExponent;
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// i.e., nextExponent = exponent * 10 + digit
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UBool overflow = uprv_mul32_overflow(exponent, 10, &nextExponent) ||
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uprv_add32_overflow(nextExponent, digit, &nextExponent);
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if (overflow) {
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exponent = INT32_MAX;
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} else {
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exponent = nextExponent;
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}
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} else {
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if (result.quantity.bogus) {
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result.quantity.bogus = false;
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}
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result.quantity.appendDigit(digit, 0, true);
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}
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result.setCharsConsumed(segment);
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groupedDigitCount++;
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if (seenDecimal) {
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digitsAfterDecimal++;
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}
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continue;
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}
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// Attempt to match a literal grouping or decimal separator
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int32_t decimalOverlap = segment.getCommonPrefixLength(actualDecimalString);
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bool decimalStringMatch = decimalOverlap == actualDecimalString.length();
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int32_t groupingOverlap = segment.getCommonPrefixLength(actualGroupingString);
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bool groupingStringMatch = groupingOverlap == actualGroupingString.length();
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hasPartialPrefix = (decimalOverlap == segment.length()) || (groupingOverlap == segment.length());
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if (!seenDecimal && !groupingStringMatch &&
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(decimalStringMatch || (!seenDecimal && decimalUniSet->contains(cp)))) {
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// matched a decimal separator
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if (requireGroupingMatch) {
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if (backupOffset != -1 || (seenGrouping && groupedDigitCount != grouping1)) {
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strictFail = true;
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break;
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}
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}
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// If we're only parsing integers, then don't parse this one.
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if (integerOnly) {
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break;
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}
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seenDecimal = true;
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if (!decimalStringMatch) {
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actualDecimalString = UnicodeString(cp);
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}
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segment.adjustOffset(actualDecimalString.length());
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result.setCharsConsumed(segment);
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result.flags |= FLAG_HAS_DECIMAL_SEPARATOR;
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continue;
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}
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if (!groupingDisabled && !decimalStringMatch &&
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(groupingStringMatch || (!seenGrouping && groupingUniSet->contains(cp)))) {
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// matched a grouping separator
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if (requireGroupingMatch) {
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if (groupedDigitCount == 0) {
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// leading group
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strictFail = true;
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break;
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} else if (backupOffset != -1) {
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// two group separators in a row
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break;
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}
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}
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if (fractionGroupingDisabled && seenDecimal) {
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// Stop parsing here.
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break;
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}
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seenGrouping = true;
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if (!groupingStringMatch) {
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actualGroupingString = UnicodeString(cp);
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}
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backupOffset = segment.getOffset();
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segment.adjustOffset(actualGroupingString.length());
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// Note: do NOT set charsConsumed
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continue;
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}
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// Not a digit and not a separator
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break;
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}
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// Check the final grouping for validity
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if (requireGroupingMatch && !seenDecimal && seenGrouping && afterFirstGrouping &&
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groupedDigitCount != grouping1) {
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strictFail = true;
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}
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if (requireGroupingMatch && strictFail) {
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result = backupResult;
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segment.setOffset(initialOffset);
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}
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if (result.quantity.bogus && segment.getOffset() != initialOffset) {
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// Strings that start with a separator but have no digits.
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// We don't need a backup of ParsedNumber because no changes could have been made to it.
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segment.setOffset(initialOffset);
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hasPartialPrefix = true;
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}
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if (!result.quantity.bogus) {
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// The final separator was a decimal separator.
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result.quantity.adjustMagnitude(-digitsAfterDecimal);
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}
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if (exponentSign != 0 && segment.getOffset() != initialOffset) {
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U_ASSERT(!result.quantity.bogus);
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bool overflow = (exponent == INT32_MAX);
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if (!overflow) {
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overflow = result.quantity.adjustMagnitude(exponentSign * exponent);
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}
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if (overflow) {
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if (exponentSign == -1) {
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// Set to zero
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result.quantity.clear();
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} else {
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// Set to infinity
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result.quantity.bogus = true;
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result.flags |= FLAG_INFINITY;
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}
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}
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}
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return segment.length() == 0 || hasPartialPrefix;
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}
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bool DecimalMatcher::smokeTest(const StringSegment& segment) const {
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// The common case uses a static leadSet for efficiency.
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if (fLocalDigitStrings.isNull() && leadSet != nullptr) {
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return segment.startsWith(*leadSet);
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}
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if (segment.startsWith(*separatorSet) || u_isdigit(segment.getCodePoint())) {
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return true;
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}
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if (fLocalDigitStrings.isNull()) {
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return false;
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}
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for (int i = 0; i < 10; i++) {
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if (segment.startsWith(fLocalDigitStrings[i])) {
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return true;
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}
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}
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return false;
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}
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UnicodeString DecimalMatcher::toString() const {
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return u"<Decimal>";
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}
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#endif /* #if !UCONFIG_NO_FORMATTING */
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