160 lines
4.7 KiB
C++
160 lines
4.7 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2015, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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*******************************************************************************
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*/
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#ifndef VALUEFORMATTER_H
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#define VALUEFORMATTER_H
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/uobject.h"
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#include "unicode/utypes.h"
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U_NAMESPACE_BEGIN
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class UnicodeString;
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class DigitList;
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class FieldPositionHandler;
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class DigitGrouping;
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class PluralRules;
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class FixedPrecision;
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class DigitFormatter;
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class DigitFormatterOptions;
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class ScientificPrecision;
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class SciFormatterOptions;
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class FixedDecimal;
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class VisibleDigitsWithExponent;
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/**
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* A closure around rounding and formatting a value. As these instances are
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* designed to be short lived (they only exist while formatting a value), they
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* do not own their own attributes. Rather the caller maintains ownership of
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* all attributes. A caller first calls a prepareXXX method on an instance
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* to share its data before using that instance. Using an
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* instance without first calling a prepareXXX method results in an
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* assertion error and a program crash.
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*/
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class U_I18N_API ValueFormatter : public UObject {
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public:
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ValueFormatter() : fType(kFormatTypeCount) {
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}
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virtual ~ValueFormatter();
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/**
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* This function is here only to support the protected round() method
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* in DecimalFormat. It serves no ther purpose than that.
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*
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* @param value this value is rounded in place.
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* @param status any error returned here.
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*/
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DigitList &round(DigitList &value, UErrorCode &status) const;
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/**
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* Returns TRUE if the absolute value of value can be fast formatted
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* using ValueFormatter::formatInt32.
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*/
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UBool isFastFormattable(int32_t value) const;
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/**
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* Converts value to a VisibleDigitsWithExponent.
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* Result may be fixed point or scientific.
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*/
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VisibleDigitsWithExponent &toVisibleDigitsWithExponent(
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int64_t value,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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/**
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* Converts value to a VisibleDigitsWithExponent.
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* Result may be fixed point or scientific.
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*/
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VisibleDigitsWithExponent &toVisibleDigitsWithExponent(
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DigitList &value,
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VisibleDigitsWithExponent &digits,
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UErrorCode &status) const;
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/**
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* formats positiveValue and appends to appendTo. Returns appendTo.
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* @param positiveValue If negative, no negative sign is formatted.
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* @param handler stores the field positions
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* @param appendTo formatted value appended here.
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*/
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UnicodeString &format(
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const VisibleDigitsWithExponent &positiveValue,
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FieldPositionHandler &handler,
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UnicodeString &appendTo) const;
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/**
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* formats positiveValue and appends to appendTo. Returns appendTo.
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* value must be positive. Calling formatInt32 to format a value when
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* isFastFormattable indicates that the value cannot be fast formatted
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* results in undefined behavior.
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*/
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UnicodeString &formatInt32(
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int32_t positiveValue,
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FieldPositionHandler &handler,
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UnicodeString &appendTo) const;
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/**
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* Returns the number of code points needed to format.
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* @param positiveValue if negative, the negative sign is not included
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* in count.
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*/
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int32_t countChar32(
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const VisibleDigitsWithExponent &positiveValue) const;
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/**
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* Prepares this instance for fixed decimal formatting.
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*/
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void prepareFixedDecimalFormatting(
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const DigitFormatter &formatter,
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const DigitGrouping &grouping,
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const FixedPrecision &precision,
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const DigitFormatterOptions &options);
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/**
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* Prepares this instance for scientific formatting.
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*/
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void prepareScientificFormatting(
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const DigitFormatter &formatter,
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const ScientificPrecision &precision,
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const SciFormatterOptions &options);
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private:
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ValueFormatter(const ValueFormatter &);
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ValueFormatter &operator=(const ValueFormatter &);
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enum FormatType {
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kFixedDecimal,
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kScientificNotation,
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kFormatTypeCount
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};
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FormatType fType;
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// for fixed decimal and scientific formatting
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const DigitFormatter *fDigitFormatter;
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// for fixed decimal formatting
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const FixedPrecision *fFixedPrecision;
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const DigitFormatterOptions *fFixedOptions;
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const DigitGrouping *fGrouping;
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// for scientific formatting
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const ScientificPrecision *fScientificPrecision;
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const SciFormatterOptions *fScientificOptions;
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};
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U_NAMESPACE_END
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#endif /* !UCONFIG_NO_FORMATTING */
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#endif /* VALUEFORMATTER_H */
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