490 lines
19 KiB
C++
490 lines
19 KiB
C++
// © 2017 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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#ifndef __NUMBER_DECIMALQUANTITY_H__
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#define __NUMBER_DECIMALQUANTITY_H__
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#include <cstdint>
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#include "unicode/umachine.h"
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#include "standardplural.h"
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#include "plurrule_impl.h"
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#include "number_types.h"
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U_NAMESPACE_BEGIN namespace number {
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namespace impl {
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// Forward-declare (maybe don't want number_utils.h included here):
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class DecNum;
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/**
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* An class for representing a number to be processed by the decimal formatting pipeline. Includes
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* methods for rounding, plural rules, and decimal digit extraction.
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*
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* <p>By design, this is NOT IMMUTABLE and NOT THREAD SAFE. It is intended to be an intermediate
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* object holding state during a pass through the decimal formatting pipeline.
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*
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* <p>Represents numbers and digit display properties using Binary Coded Decimal (BCD).
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*
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* <p>Java has multiple implementations for testing, but C++ has only one implementation.
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*/
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class U_I18N_API DecimalQuantity : public IFixedDecimal, public UMemory {
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public:
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/** Copy constructor. */
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DecimalQuantity(const DecimalQuantity &other);
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/** Move constructor. */
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DecimalQuantity(DecimalQuantity &&src) U_NOEXCEPT;
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DecimalQuantity();
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~DecimalQuantity() override;
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/**
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* Sets this instance to be equal to another instance.
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*
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* @param other The instance to copy from.
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*/
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DecimalQuantity &operator=(const DecimalQuantity &other);
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/** Move assignment */
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DecimalQuantity &operator=(DecimalQuantity&& src) U_NOEXCEPT;
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/**
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* Sets the minimum and maximum integer digits that this {@link DecimalQuantity} should generate.
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* This method does not perform rounding.
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*
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* @param minInt The minimum number of integer digits.
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* @param maxInt The maximum number of integer digits.
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*/
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void setIntegerLength(int32_t minInt, int32_t maxInt);
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/**
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* Sets the minimum and maximum fraction digits that this {@link DecimalQuantity} should generate.
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* This method does not perform rounding.
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*
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* @param minFrac The minimum number of fraction digits.
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* @param maxFrac The maximum number of fraction digits.
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*/
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void setFractionLength(int32_t minFrac, int32_t maxFrac);
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/**
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* Rounds the number to a specified interval, such as 0.05.
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*
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* <p>If rounding to a power of ten, use the more efficient {@link #roundToMagnitude} instead.
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*
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* @param roundingIncrement The increment to which to round.
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* @param mathContext The {@link RoundingMode} to use if rounding is necessary.
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*/
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void roundToIncrement(double roundingIncrement, RoundingMode roundingMode,
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int32_t maxFrac, UErrorCode& status);
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/**
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* Rounds the number to a specified magnitude (power of ten).
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*
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* @param roundingMagnitude The power of ten to which to round. For example, a value of -2 will
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* round to 2 decimal places.
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* @param mathContext The {@link RoundingMode} to use if rounding is necessary.
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*/
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void roundToMagnitude(int32_t magnitude, RoundingMode roundingMode, UErrorCode& status);
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/**
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* Rounds the number to an infinite number of decimal points. This has no effect except for
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* forcing the double in {@link DecimalQuantity_AbstractBCD} to adopt its exact representation.
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*/
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void roundToInfinity();
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/**
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* Multiply the internal value. Uses decNumber.
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*
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* @param multiplicand The value by which to multiply.
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*/
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void multiplyBy(const DecNum& multiplicand, UErrorCode& status);
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/**
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* Divide the internal value. Uses decNumber.
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*
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* @param multiplicand The value by which to multiply.
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*/
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void divideBy(const DecNum& divisor, UErrorCode& status);
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/** Flips the sign from positive to negative and back. */
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void negate();
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/**
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* Scales the number by a power of ten. For example, if the value is currently "1234.56", calling
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* this method with delta=-3 will change the value to "1.23456".
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*
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* @param delta The number of magnitudes of ten to change by.
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* @return true if integer overflow occured; false otherwise.
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*/
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bool adjustMagnitude(int32_t delta);
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/**
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* @return The power of ten corresponding to the most significant nonzero digit.
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* The number must not be zero.
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*/
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int32_t getMagnitude() const;
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/** @return Whether the value represented by this {@link DecimalQuantity} is zero. */
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bool isZero() const;
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/** @return Whether the value represented by this {@link DecimalQuantity} is less than zero. */
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bool isNegative() const;
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/** @return -1 if the value is negative; 1 if positive; or 0 if zero. */
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int8_t signum() const;
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/** @return Whether the value represented by this {@link DecimalQuantity} is infinite. */
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bool isInfinite() const U_OVERRIDE;
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/** @return Whether the value represented by this {@link DecimalQuantity} is not a number. */
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bool isNaN() const U_OVERRIDE;
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/** @param truncateIfOverflow if false and the number does NOT fit, fails with an assertion error. */
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int64_t toLong(bool truncateIfOverflow = false) const;
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uint64_t toFractionLong(bool includeTrailingZeros) const;
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/**
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* Returns whether or not a Long can fully represent the value stored in this DecimalQuantity.
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* @param ignoreFraction if true, silently ignore digits after the decimal place.
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*/
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bool fitsInLong(bool ignoreFraction = false) const;
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/** @return The value contained in this {@link DecimalQuantity} approximated as a double. */
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double toDouble() const;
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/** Computes a DecNum representation of this DecimalQuantity, saving it to the output parameter. */
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void toDecNum(DecNum& output, UErrorCode& status) const;
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DecimalQuantity &setToInt(int32_t n);
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DecimalQuantity &setToLong(int64_t n);
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DecimalQuantity &setToDouble(double n);
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/** decNumber is similar to BigDecimal in Java. */
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DecimalQuantity &setToDecNumber(StringPiece n, UErrorCode& status);
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/** Internal method if the caller already has a DecNum. */
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DecimalQuantity &setToDecNum(const DecNum& n, UErrorCode& status);
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/**
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* Appends a digit, optionally with one or more leading zeros, to the end of the value represented
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* by this DecimalQuantity.
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*
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* <p>The primary use of this method is to construct numbers during a parsing loop. It allows
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* parsing to take advantage of the digit list infrastructure primarily designed for formatting.
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*
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* @param value The digit to append.
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* @param leadingZeros The number of zeros to append before the digit. For example, if the value
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* in this instance starts as 12.3, and you append a 4 with 1 leading zero, the value becomes
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* 12.304.
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* @param appendAsInteger If true, increase the magnitude of existing digits to make room for the
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* new digit. If false, append to the end like a fraction digit. If true, there must not be
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* any fraction digits already in the number.
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* @internal
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* @deprecated This API is ICU internal only.
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*/
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void appendDigit(int8_t value, int32_t leadingZeros, bool appendAsInteger);
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/**
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* Computes the plural form for this number based on the specified set of rules.
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*
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* @param rules A {@link PluralRules} object representing the set of rules.
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* @return The {@link StandardPlural} according to the PluralRules. If the plural form is not in
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* the set of standard plurals, {@link StandardPlural#OTHER} is returned instead.
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*/
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StandardPlural::Form getStandardPlural(const PluralRules *rules) const;
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double getPluralOperand(PluralOperand operand) const U_OVERRIDE;
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bool hasIntegerValue() const U_OVERRIDE;
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/**
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* Gets the digit at the specified magnitude. For example, if the represented number is 12.3,
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* getDigit(-1) returns 3, since 3 is the digit corresponding to 10^-1.
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*
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* @param magnitude The magnitude of the digit.
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* @return The digit at the specified magnitude.
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*/
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int8_t getDigit(int32_t magnitude) const;
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/**
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* Gets the largest power of ten that needs to be displayed. The value returned by this function
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* will be bounded between minInt and maxInt.
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*
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* @return The highest-magnitude digit to be displayed.
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*/
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int32_t getUpperDisplayMagnitude() const;
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/**
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* Gets the smallest power of ten that needs to be displayed. The value returned by this function
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* will be bounded between -minFrac and -maxFrac.
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*
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* @return The lowest-magnitude digit to be displayed.
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*/
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int32_t getLowerDisplayMagnitude() const;
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int32_t fractionCount() const;
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int32_t fractionCountWithoutTrailingZeros() const;
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void clear();
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/** This method is for internal testing only. */
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uint64_t getPositionFingerprint() const;
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// /**
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// * If the given {@link FieldPosition} is a {@link UFieldPosition}, populates it with the fraction
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// * length and fraction long value. If the argument is not a {@link UFieldPosition}, nothing
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// * happens.
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// *
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// * @param fp The {@link UFieldPosition} to populate.
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// */
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// void populateUFieldPosition(FieldPosition fp);
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/**
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* Checks whether the bytes stored in this instance are all valid. For internal unit testing only.
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*
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* @return An error message if this instance is invalid, or null if this instance is healthy.
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*/
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const char16_t* checkHealth() const;
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UnicodeString toString() const;
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/** Returns the string in standard exponential notation. */
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UnicodeString toScientificString() const;
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/** Returns the string without exponential notation. Slightly slower than toScientificString(). */
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UnicodeString toPlainString() const;
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/** Visible for testing */
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inline bool isUsingBytes() { return usingBytes; }
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/** Visible for testing */
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inline bool isExplicitExactDouble() { return explicitExactDouble; };
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bool operator==(const DecimalQuantity& other) const;
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inline bool operator!=(const DecimalQuantity& other) const {
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return !(*this == other);
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}
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/**
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* Bogus flag for when a DecimalQuantity is stored on the stack.
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*/
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bool bogus = false;
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private:
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/**
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* The power of ten corresponding to the least significant digit in the BCD. For example, if this
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* object represents the number "3.14", the BCD will be "0x314" and the scale will be -2.
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*
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* <p>Note that in {@link java.math.BigDecimal}, the scale is defined differently: the number of
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* digits after the decimal place, which is the negative of our definition of scale.
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*/
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int32_t scale;
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/**
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* The number of digits in the BCD. For example, "1007" has BCD "0x1007" and precision 4. The
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* maximum precision is 16 since a long can hold only 16 digits.
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*
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* <p>This value must be re-calculated whenever the value in bcd changes by using {@link
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* #computePrecisionAndCompact()}.
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*/
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int32_t precision;
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/**
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* A bitmask of properties relating to the number represented by this object.
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*
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* @see #NEGATIVE_FLAG
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* @see #INFINITY_FLAG
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* @see #NAN_FLAG
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*/
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int8_t flags;
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// The following three fields relate to the double-to-ascii fast path algorithm.
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// When a double is given to DecimalQuantityBCD, it is converted to using a fast algorithm. The
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// fast algorithm guarantees correctness to only the first ~12 digits of the double. The process
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// of rounding the number ensures that the converted digits are correct, falling back to a slow-
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// path algorithm if required. Therefore, if a DecimalQuantity is constructed from a double, it
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// is *required* that roundToMagnitude(), roundToIncrement(), or roundToInfinity() is called. If
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// you don't round, assertions will fail in certain other methods if you try calling them.
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/**
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* Whether the value in the BCD comes from the double fast path without having been rounded to
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* ensure correctness
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*/
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UBool isApproximate;
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/**
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* The original number provided by the user and which is represented in BCD. Used when we need to
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* re-compute the BCD for an exact double representation.
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*/
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double origDouble;
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/**
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* The change in magnitude relative to the original double. Used when we need to re-compute the
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* BCD for an exact double representation.
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*/
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int32_t origDelta;
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// Four positions: left optional '(', left required '[', right required ']', right optional ')'.
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// These four positions determine which digits are displayed in the output string. They do NOT
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// affect rounding. These positions are internal-only and can be specified only by the public
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// endpoints like setFractionLength, setIntegerLength, and setSignificantDigits, among others.
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//
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// * Digits between lReqPos and rReqPos are in the "required zone" and are always displayed.
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// * Digits between lOptPos and rOptPos but outside the required zone are in the "optional zone"
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// and are displayed unless they are trailing off the left or right edge of the number and
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// have a numerical value of zero. In order to be "trailing", the digits need to be beyond
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// the decimal point in their respective directions.
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// * Digits outside of the "optional zone" are never displayed.
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//
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// See the table below for illustrative examples.
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//
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// +---------+---------+---------+---------+------------+------------------------+--------------+
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// | lOptPos | lReqPos | rReqPos | rOptPos | number | positions | en-US string |
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// +---------+---------+---------+---------+------------+------------------------+--------------+
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// | 5 | 2 | -1 | -5 | 1234.567 | ( 12[34.5]67 ) | 1,234.567 |
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// | 3 | 2 | -1 | -5 | 1234.567 | 1(2[34.5]67 ) | 234.567 |
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// | 3 | 2 | -1 | -2 | 1234.567 | 1(2[34.5]6)7 | 234.56 |
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// | 6 | 4 | 2 | -5 | 123456789. | 123(45[67]89. ) | 456,789. |
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// | 6 | 4 | 2 | 1 | 123456789. | 123(45[67]8)9. | 456,780. |
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// | -1 | -1 | -3 | -4 | 0.123456 | 0.1([23]4)56 | .0234 |
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// | 6 | 4 | -2 | -2 | 12.3 | ( [ 12.3 ]) | 0012.30 |
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// +---------+---------+---------+---------+------------+------------------------+--------------+
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//
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int32_t lOptPos = INT32_MAX;
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int32_t lReqPos = 0;
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int32_t rReqPos = 0;
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int32_t rOptPos = INT32_MIN;
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/**
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* The BCD of the 16 digits of the number represented by this object. Every 4 bits of the long map
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* to one digit. For example, the number "12345" in BCD is "0x12345".
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*
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* <p>Whenever bcd changes internally, {@link #compact()} must be called, except in special cases
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* like setting the digit to zero.
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*/
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union {
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struct {
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int8_t *ptr;
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int32_t len;
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} bcdBytes;
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uint64_t bcdLong;
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} fBCD;
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bool usingBytes = false;
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/**
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* Whether this {@link DecimalQuantity} has been explicitly converted to an exact double. true if
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* backed by a double that was explicitly converted via convertToAccurateDouble; false otherwise.
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* Used for testing.
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*/
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bool explicitExactDouble = false;
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/**
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* Returns a single digit from the BCD list. No internal state is changed by calling this method.
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*
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* @param position The position of the digit to pop, counted in BCD units from the least
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* significant digit. If outside the range supported by the implementation, zero is returned.
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* @return The digit at the specified location.
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*/
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int8_t getDigitPos(int32_t position) const;
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/**
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* Sets the digit in the BCD list. This method only sets the digit; it is the caller's
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* responsibility to call {@link #compact} after setting the digit.
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*
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* @param position The position of the digit to pop, counted in BCD units from the least
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* significant digit. If outside the range supported by the implementation, an AssertionError
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* is thrown.
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* @param value The digit to set at the specified location.
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*/
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void setDigitPos(int32_t position, int8_t value);
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/**
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* Adds zeros to the end of the BCD list. This will result in an invalid BCD representation; it is
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* the caller's responsibility to do further manipulation and then call {@link #compact}.
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*
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* @param numDigits The number of zeros to add.
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*/
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void shiftLeft(int32_t numDigits);
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void shiftRight(int32_t numDigits);
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/**
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* Sets the internal representation to zero. Clears any values stored in scale, precision,
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* hasDouble, origDouble, origDelta, and BCD data.
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*/
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void setBcdToZero();
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/**
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* Sets the internal BCD state to represent the value in the given int. The int is guaranteed to
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* be either positive. The internal state is guaranteed to be empty when this method is called.
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*
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* @param n The value to consume.
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*/
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void readIntToBcd(int32_t n);
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/**
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* Sets the internal BCD state to represent the value in the given long. The long is guaranteed to
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* be either positive. The internal state is guaranteed to be empty when this method is called.
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*
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* @param n The value to consume.
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*/
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void readLongToBcd(int64_t n);
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void readDecNumberToBcd(const DecNum& dn);
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void readDoubleConversionToBcd(const char* buffer, int32_t length, int32_t point);
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void copyFieldsFrom(const DecimalQuantity& other);
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void copyBcdFrom(const DecimalQuantity &other);
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void moveBcdFrom(DecimalQuantity& src);
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/**
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* Removes trailing zeros from the BCD (adjusting the scale as required) and then computes the
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* precision. The precision is the number of digits in the number up through the greatest nonzero
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* digit.
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*
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* <p>This method must always be called when bcd changes in order for assumptions to be correct in
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* methods like {@link #fractionCount()}.
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*/
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void compact();
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void _setToInt(int32_t n);
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void _setToLong(int64_t n);
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void _setToDoubleFast(double n);
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void _setToDecNum(const DecNum& dn, UErrorCode& status);
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void convertToAccurateDouble();
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/** Ensure that a byte array of at least 40 digits is allocated. */
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void ensureCapacity();
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void ensureCapacity(int32_t capacity);
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/** Switches the internal storage mechanism between the 64-bit long and the byte array. */
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void switchStorage();
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};
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} // namespace impl
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} // namespace number
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U_NAMESPACE_END
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#endif //__NUMBER_DECIMALQUANTITY_H__
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#endif /* #if !UCONFIG_NO_FORMATTING */
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