Patterns * *
A DecimalFormat consists of a pattern and a set of * symbols. The pattern may be set directly using * applyPattern(), or indirectly using other API methods which * manipulate aspects of the pattern, such as the minimum number of integer * digits. The symbols are stored in a DecimalFormatSymbols * object. When using the NumberFormat factory methods, the * pattern and symbols are read from ICU's locale data. * *
Special Pattern Characters * *
Many characters in a pattern are taken literally; they are matched during * parsing and output unchanged during formatting. Special characters, on the * other hand, stand for other characters, strings, or classes of characters. * For example, the '#' character is replaced by a localized digit. Often the * replacement character is the same as the pattern character; in the U.S. locale, * the ',' grouping character is replaced by ','. However, the replacement is * still happening, and if the symbols are modified, the grouping character * changes. Some special characters affect the behavior of the formatter by * their presence; for example, if the percent character is seen, then the * value is multiplied by 100 before being displayed. * *
To insert a special character in a pattern as a literal, that is, without * any special meaning, the character must be quoted. There are some exceptions to * this which are noted below. * *
The characters listed here are used in non-localized patterns. Localized * patterns use the corresponding characters taken from this formatter's * DecimalFormatSymbols object instead, and these characters lose * their special status. Two exceptions are the currency sign and quote, which * are not localized. * *
| Symbol * | Location * | Localized? * | Meaning * |
0
* | Number * | Yes * | Digit * |
1-9
* | Number * | Yes * | '1' through '9' indicate rounding. * |
\htmlonly@\endhtmlonly
* | Number * | No * | Significant digit * |
#
* | Number * | Yes * | Digit, zero shows as absent * |
.
* | Number * | Yes * | Decimal separator or monetary decimal separator * |
-
* | Number * | Yes * | Minus sign * |
,
* | Number * | Yes * | Grouping separator * |
E
* | Number * | Yes * | Separates mantissa and exponent in scientific notation. * Need not be quoted in prefix or suffix. * |
+
* | Exponent * | Yes * | Prefix positive exponents with localized plus sign. * Need not be quoted in prefix or suffix. * |
;
* | Subpattern boundary * | Yes * | Separates positive and negative subpatterns * |
\%
* | Prefix or suffix * | Yes * | Multiply by 100 and show as percentage * |
\\u2030
* | Prefix or suffix * | Yes * | Multiply by 1000 and show as per mille * |
\htmlonly¤\endhtmlonly (\\u00A4)
* | Prefix or suffix * | No * | Currency sign, replaced by currency symbol. If * doubled, replaced by international currency symbol. * If tripled, replaced by currency plural names, for example, * "US dollar" or "US dollars" for America. * If present in a pattern, the monetary decimal separator * is used instead of the decimal separator. * |
'
* | Prefix or suffix * | No * | Used to quote special characters in a prefix or suffix,
* for example, "'#'#" formats 123 to
* "#123". To create a single quote
* itself, use two in a row: "# o''clock".
* |
*
* | Prefix or suffix boundary * | Yes * | Pad escape, precedes pad character * |
A DecimalFormat pattern contains a positive and negative * subpattern, for example, "#,##0.00;(#,##0.00)". Each subpattern has a * prefix, a numeric part, and a suffix. If there is no explicit negative * subpattern, the negative subpattern is the localized minus sign prefixed to the * positive subpattern. That is, "0.00" alone is equivalent to "0.00;-0.00". If there * is an explicit negative subpattern, it serves only to specify the negative * prefix and suffix; the number of digits, minimal digits, and other * characteristics are ignored in the negative subpattern. That means that * "#,##0.0#;(#)" has precisely the same result as "#,##0.0#;(#,##0.0#)". * *
The prefixes, suffixes, and various symbols used for infinity, digits, * thousands separators, decimal separators, etc. may be set to arbitrary * values, and they will appear properly during formatting. However, care must * be taken that the symbols and strings do not conflict, or parsing will be * unreliable. For example, either the positive and negative prefixes or the * suffixes must be distinct for parse() to be able * to distinguish positive from negative values. Another example is that the * decimal separator and thousands separator should be distinct characters, or * parsing will be impossible. * *
The grouping separator is a character that separates clusters of * integer digits to make large numbers more legible. It commonly used for * thousands, but in some locales it separates ten-thousands. The grouping * size is the number of digits between the grouping separators, such as 3 * for "100,000,000" or 4 for "1 0000 0000". There are actually two different * grouping sizes: One used for the least significant integer digits, the * primary grouping size, and one used for all others, the * secondary grouping size. In most locales these are the same, but * sometimes they are different. For example, if the primary grouping interval * is 3, and the secondary is 2, then this corresponds to the pattern * "#,##,##0", and the number 123456789 is formatted as "12,34,56,789". If a * pattern contains multiple grouping separators, the interval between the last * one and the end of the integer defines the primary grouping size, and the * interval between the last two defines the secondary grouping size. All others * are ignored, so "#,##,###,####" == "###,###,####" == "##,#,###,####". * *
Illegal patterns, such as "#.#.#" or "#.###,###", will cause * DecimalFormat to set a failing UErrorCode. * *
Pattern BNF * *
* pattern := subpattern (';' subpattern)?
* subpattern := prefix? number exponent? suffix?
* number := (integer ('.' fraction)?) | sigDigits
* prefix := '\\u0000'..'\\uFFFD' - specialCharacters
* suffix := '\\u0000'..'\\uFFFD' - specialCharacters
* integer := '#'* '0'* '0'
* fraction := '0'* '#'*
* sigDigits := '#'* '@' '@'* '#'*
* exponent := 'E' '+'? '0'* '0'
* padSpec := '*' padChar
* padChar := '\\u0000'..'\\uFFFD' - quote
*
* Notation:
* X* 0 or more instances of X
* X? 0 or 1 instances of X
* X|Y either X or Y
* C..D any character from C up to D, inclusive
* S-T characters in S, except those in T
*
* The first subpattern is for positive numbers. The second (optional)
* subpattern is for negative numbers.
*
* Not indicated in the BNF syntax above: * *
padSpec may appear before the prefix,
* after the prefix, before the suffix, after the suffix, or not at all.
*
* Parsing * *
DecimalFormat parses all Unicode characters that represent * decimal digits, as defined by u_charDigitValue(). In addition, * DecimalFormat also recognizes as digits the ten consecutive * characters starting with the localized zero digit defined in the * DecimalFormatSymbols object. During formatting, the * DecimalFormatSymbols-based digits are output. * *
During parsing, grouping separators are ignored if in lenient mode; * otherwise, if present, they must be in appropriate positions. * *
For currency parsing, the formatter is able to parse every currency * style formats no matter which style the formatter is constructed with. * For example, a formatter instance gotten from * NumberFormat.getInstance(ULocale, NumberFormat.CURRENCYSTYLE) can parse * formats such as "USD1.00" and "3.00 US dollars". * *
If parse(UnicodeString&,Formattable&,ParsePosition&) * fails to parse a string, it leaves the parse position unchanged. * The convenience method parse(UnicodeString&,Formattable&,UErrorCode&) * indicates parse failure by setting a failing * UErrorCode. * *
Formatting * *
Formatting is guided by several parameters, all of which can be * specified either using a pattern or using the API. The following * description applies to formats that do not use scientific * notation or significant digits. * *
Special Values * *
NaN is represented as a single character, typically
* \\uFFFD. This character is determined by the
* DecimalFormatSymbols object. This is the only value for which
* the prefixes and suffixes are not used.
*
*
Infinity is represented as a single character, typically
* \\u221E, with the positive or negative prefixes and suffixes
* applied. The infinity character is determined by the
* DecimalFormatSymbols object.
*
* Scientific Notation
*
*
Numbers in scientific notation are expressed as the product of a mantissa * and a power of ten, for example, 1234 can be expressed as 1.234 x 103. The * mantissa is typically in the half-open interval [1.0, 10.0) or sometimes [0.0, 1.0), * but it need not be. DecimalFormat supports arbitrary mantissas. * DecimalFormat can be instructed to use scientific * notation through the API or through the pattern. In a pattern, the exponent * character immediately followed by one or more digit characters indicates * scientific notation. Example: "0.###E0" formats the number 1234 as * "1.234E3". * *
DecimalFormat has two ways of controlling how many
* digits are shows: (a) significant digits counts, or (b) integer and
* fraction digit counts. Integer and fraction digit counts are
* described above. When a formatter is using significant digits
* counts, the number of integer and fraction digits is not specified
* directly, and the formatter settings for these counts are ignored.
* Instead, the formatter uses however many integer and fraction
* digits are required to display the specified number of significant
* digits. Examples:
*
* | Pattern * | Minimum significant digits * | Maximum significant digits * | Number * | Output of format() * |
\@\@\@
* | 3 * | 3 * | 12345 * | 12300
* |
\@\@\@
* | 3 * | 3 * | 0.12345 * | 0.123
* |
\@\@##
* | 2 * | 4 * | 3.14159 * | 3.142
* |
\@\@##
* | 2 * | 4 * | 1.23004 * | 1.23
* |
'@' and '#'
* characters. The minimum number of significant digits is the number
* of '@' characters. The maximum number of significant
* digits is the number of '@' characters plus the number
* of '#' characters following on the right. For
* example, the pattern "@@@" indicates exactly 3
* significant digits. The pattern "@##" indicates from
* 1 to 3 significant digits. Trailing zero digits to the right of
* the decimal separator are suppressed after the minimum number of
* significant digits have been shown. For example, the pattern
* "@##" formats the number 0.1203 as
* "0.12".
*
* '0' pattern character.
* Patterns such as "@00" or "@.###" are
* disallowed.
*
* '#' characters may be prepended to
* the left of the leftmost '@' character. These have no
* effect on the minimum and maximum significant digits counts, but
* may be used to position grouping separators. For example,
* "#,#@#" indicates a minimum of one significant digits,
* a maximum of two significant digits, and a grouping size of three.
*
* '@' pattern character. Alternatively,
* call setSignificantDigitsUsed(true).
*
* '@' pattern
* character. Alternatively, call setSignificantDigitsUsed(false).
*
* getMinimumSignificantDigits() - 1, and a maximum fraction digit
* count of getMaximumSignificantDigits() - 1. For example, the
* pattern "@@###E0" is equivalent to "0.0###E0".
*
* Padding * *
DecimalFormat supports padding the result of
* format() to a specific width. Padding may be specified either
* through the API or through the pattern syntax. In a pattern the pad escape
* character, followed by a single pad character, causes padding to be parsed
* and formatted. The pad escape character is '*' in unlocalized patterns, and
* can be localized using DecimalFormatSymbols::setSymbol() with a
* DecimalFormatSymbols::kPadEscapeSymbol
* selector. For example, "$*x#,##0.00" formats 123 to
* "$xx123.00", and 1234 to "$1,234.00".
*
*
"* #0 o''clock", the format width is 10.
*
* Rounding * *
DecimalFormat supports rounding to a specific increment. For * example, 1230 rounded to the nearest 50 is 1250. 1.234 rounded to the * nearest 0.65 is 1.3. The rounding increment may be specified through the API * or in a pattern. To specify a rounding increment in a pattern, include the * increment in the pattern itself. "#,#50" specifies a rounding increment of * 50. "#,##0.05" specifies a rounding increment of 0.05. * *
In the absence of an explicit rounding increment numbers are * rounded to their formatted width. * *
Synchronization * *
DecimalFormat objects are not synchronized. Multiple * threads should not access one formatter concurrently. * *
Subclassing * *
User subclasses are not supported. While clients may write * subclasses, such code will not necessarily work and will not be * guaranteed to work stably from release to release. */ class U_I18N_API DecimalFormat : public NumberFormat { public: /** * Pad position. * @stable ICU 2.4 */ enum EPadPosition { kPadBeforePrefix, kPadAfterPrefix, kPadBeforeSuffix, kPadAfterSuffix }; /** * Create a DecimalFormat using the default pattern and symbols * for the default locale. This is a convenient way to obtain a * DecimalFormat when internationalization is not the main concern. *
* To obtain standard formats for a given locale, use the factory methods * on NumberFormat such as createInstance. These factories will * return the most appropriate sub-class of NumberFormat for a given * locale. *
* NOTE: New users are strongly encouraged to use * #icu::number::NumberFormatter instead of DecimalFormat. * @param status Output param set to success/failure code. If the * pattern is invalid this will be set to a failure code. * @stable ICU 2.0 */ DecimalFormat(UErrorCode& status); /** * Create a DecimalFormat from the given pattern and the symbols * for the default locale. This is a convenient way to obtain a * DecimalFormat when internationalization is not the main concern. *
* To obtain standard formats for a given locale, use the factory methods * on NumberFormat such as createInstance. These factories will * return the most appropriate sub-class of NumberFormat for a given * locale. *
* NOTE: New users are strongly encouraged to use * #icu::number::NumberFormatter instead of DecimalFormat. * @param pattern A non-localized pattern string. * @param status Output param set to success/failure code. If the * pattern is invalid this will be set to a failure code. * @stable ICU 2.0 */ DecimalFormat(const UnicodeString& pattern, UErrorCode& status); /** * Create a DecimalFormat from the given pattern and symbols. * Use this constructor when you need to completely customize the * behavior of the format. *
* To obtain standard formats for a given * locale, use the factory methods on NumberFormat such as * createInstance or createCurrencyInstance. If you need only minor adjustments * to a standard format, you can modify the format returned by * a NumberFormat factory method. *
* NOTE: New users are strongly encouraged to use * #icu::number::NumberFormatter instead of DecimalFormat. * * @param pattern a non-localized pattern string * @param symbolsToAdopt the set of symbols to be used. The caller should not * delete this object after making this call. * @param status Output param set to success/failure code. If the * pattern is invalid this will be set to a failure code. * @stable ICU 2.0 */ DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt, UErrorCode& status); #ifndef U_HIDE_INTERNAL_API /** * This API is for ICU use only. * Create a DecimalFormat from the given pattern, symbols, and style. * * @param pattern a non-localized pattern string * @param symbolsToAdopt the set of symbols to be used. The caller should not * delete this object after making this call. * @param style style of decimal format * @param status Output param set to success/failure code. If the * pattern is invalid this will be set to a failure code. * @internal */ DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt, UNumberFormatStyle style, UErrorCode& status); #if UCONFIG_HAVE_PARSEALLINPUT /** * @internal */ void setParseAllInput(UNumberFormatAttributeValue value); #endif #endif /* U_HIDE_INTERNAL_API */ private: /** * Internal constructor for DecimalFormat; sets up internal fields. All public constructors should * call this constructor. */ DecimalFormat(const DecimalFormatSymbols* symbolsToAdopt, UErrorCode& status); public: /** * Set an integer attribute on this DecimalFormat. * May return U_UNSUPPORTED_ERROR if this instance does not support * the specified attribute. * @param attr the attribute to set * @param newValue new value * @param status the error type * @return *this - for chaining (example: format.setAttribute(...).setAttribute(...) ) * @stable ICU 51 */ virtual DecimalFormat& setAttribute(UNumberFormatAttribute attr, int32_t newValue, UErrorCode& status); /** * Get an integer * May return U_UNSUPPORTED_ERROR if this instance does not support * the specified attribute. * @param attr the attribute to set * @param status the error type * @return the attribute value. Undefined if there is an error. * @stable ICU 51 */ virtual int32_t getAttribute(UNumberFormatAttribute attr, UErrorCode& status) const; /** * Set whether or not grouping will be used in this format. * @param newValue True, grouping will be used in this format. * @see getGroupingUsed * @stable ICU 53 */ void setGroupingUsed(UBool newValue) override; /** * Sets whether or not numbers should be parsed as integers only. * @param value set True, this format will parse numbers as integers * only. * @see isParseIntegerOnly * @stable ICU 53 */ void setParseIntegerOnly(UBool value) override; /** * Sets whether lenient parsing should be enabled (it is off by default). * * @param enable \c true if lenient parsing should be used, * \c false otherwise. * @stable ICU 4.8 */ void setLenient(UBool enable) override; /** * Create a DecimalFormat from the given pattern and symbols. * Use this constructor when you need to completely customize the * behavior of the format. *
* To obtain standard formats for a given * locale, use the factory methods on NumberFormat such as * createInstance or createCurrencyInstance. If you need only minor adjustments * to a standard format, you can modify the format returned by * a NumberFormat factory method. *
* NOTE: New users are strongly encouraged to use * #icu::number::NumberFormatter instead of DecimalFormat. * * @param pattern a non-localized pattern string * @param symbolsToAdopt the set of symbols to be used. The caller should not * delete this object after making this call. * @param parseError Output param to receive errors occurred during parsing * @param status Output param set to success/failure code. If the * pattern is invalid this will be set to a failure code. * @stable ICU 2.0 */ DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt, UParseError& parseError, UErrorCode& status); /** * Create a DecimalFormat from the given pattern and symbols. * Use this constructor when you need to completely customize the * behavior of the format. *
* To obtain standard formats for a given * locale, use the factory methods on NumberFormat such as * createInstance or createCurrencyInstance. If you need only minor adjustments * to a standard format, you can modify the format returned by * a NumberFormat factory method. *
* NOTE: New users are strongly encouraged to use * #icu::number::NumberFormatter instead of DecimalFormat. * * @param pattern a non-localized pattern string * @param symbols the set of symbols to be used * @param status Output param set to success/failure code. If the * pattern is invalid this will be set to a failure code. * @stable ICU 2.0 */ DecimalFormat(const UnicodeString& pattern, const DecimalFormatSymbols& symbols, UErrorCode& status); /** * Copy constructor. * * @param source the DecimalFormat object to be copied from. * @stable ICU 2.0 */ DecimalFormat(const DecimalFormat& source); /** * Assignment operator. * * @param rhs the DecimalFormat object to be copied. * @stable ICU 2.0 */ DecimalFormat& operator=(const DecimalFormat& rhs); /** * Destructor. * @stable ICU 2.0 */ ~DecimalFormat() override; /** * Clone this Format object polymorphically. The caller owns the * result and should delete it when done. * * @return a polymorphic copy of this DecimalFormat. * @stable ICU 2.0 */ DecimalFormat* clone() const override; /** * Return true if the given Format objects are semantically equal. * Objects of different subclasses are considered unequal. * * @param other the object to be compared with. * @return true if the given Format objects are semantically equal. * @stable ICU 2.0 */ bool operator==(const Format& other) const override; using NumberFormat::format; /** * Format a double or long number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @return Reference to 'appendTo' parameter. * @stable ICU 2.0 */ UnicodeString& format(double number, UnicodeString& appendTo, FieldPosition& pos) const override; #ifndef U_HIDE_INTERNAL_API /** * Format a double or long number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @param status * @return Reference to 'appendTo' parameter. * @internal */ UnicodeString& format(double number, UnicodeString& appendTo, FieldPosition& pos, UErrorCode& status) const override; #endif /* U_HIDE_INTERNAL_API */ /** * Format a double or long number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param posIter On return, can be used to iterate over positions * of fields generated by this format call. * Can be nullptr. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @stable ICU 4.4 */ UnicodeString& format(double number, UnicodeString& appendTo, FieldPositionIterator* posIter, UErrorCode& status) const override; /** * Format a long number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @return Reference to 'appendTo' parameter. * @stable ICU 2.0 */ UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPosition& pos) const override; #ifndef U_HIDE_INTERNAL_API /** * Format a long number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @internal */ UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPosition& pos, UErrorCode& status) const override; #endif /* U_HIDE_INTERNAL_API */ /** * Format a long number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param posIter On return, can be used to iterate over positions * of fields generated by this format call. * Can be nullptr. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @stable ICU 4.4 */ UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPositionIterator* posIter, UErrorCode& status) const override; /** * Format an int64 number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @return Reference to 'appendTo' parameter. * @stable ICU 2.8 */ UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPosition& pos) const override; #ifndef U_HIDE_INTERNAL_API /** * Format an int64 number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @internal */ UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPosition& pos, UErrorCode& status) const override; #endif /* U_HIDE_INTERNAL_API */ /** * Format an int64 number using base-10 representation. * * @param number The value to be formatted. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param posIter On return, can be used to iterate over positions * of fields generated by this format call. * Can be nullptr. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @stable ICU 4.4 */ UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPositionIterator* posIter, UErrorCode& status) const override; /** * Format a decimal number. * The syntax of the unformatted number is a "numeric string" * as defined in the Decimal Arithmetic Specification, available at * http://speleotrove.com/decimal * * @param number The unformatted number, as a string. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param posIter On return, can be used to iterate over positions * of fields generated by this format call. * Can be nullptr. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @stable ICU 4.4 */ UnicodeString& format(StringPiece number, UnicodeString& appendTo, FieldPositionIterator* posIter, UErrorCode& status) const override; #ifndef U_HIDE_INTERNAL_API /** * Format a decimal number. * The number is a DecimalQuantity wrapper onto a floating point decimal number. * The default implementation in NumberFormat converts the decimal number * to a double and formats that. * * @param number The number, a DecimalQuantity format Decimal Floating Point. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param posIter On return, can be used to iterate over positions * of fields generated by this format call. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @internal */ UnicodeString& format(const number::impl::DecimalQuantity& number, UnicodeString& appendTo, FieldPositionIterator* posIter, UErrorCode& status) const override; /** * Format a decimal number. * The number is a DecimalQuantity wrapper onto a floating point decimal number. * The default implementation in NumberFormat converts the decimal number * to a double and formats that. * * @param number The number, a DecimalQuantity format Decimal Floating Point. * @param appendTo Output parameter to receive result. * Result is appended to existing contents. * @param pos On input: an alignment field, if desired. * On output: the offsets of the alignment field. * @param status Output param filled with success/failure status. * @return Reference to 'appendTo' parameter. * @internal */ UnicodeString& format(const number::impl::DecimalQuantity& number, UnicodeString& appendTo, FieldPosition& pos, UErrorCode& status) const override; #endif // U_HIDE_INTERNAL_API using NumberFormat::parse; /** * Parse the given string using this object's choices. The method * does string comparisons to try to find an optimal match. * If no object can be parsed, index is unchanged, and nullptr is * returned. The result is returned as the most parsimonious * type of Formattable that will accommodate all of the * necessary precision. For example, if the result is exactly 12, * it will be returned as a long. However, if it is 1.5, it will * be returned as a double. * * @param text The text to be parsed. * @param result Formattable to be set to the parse result. * If parse fails, return contents are undefined. * @param parsePosition The position to start parsing at on input. * On output, moved to after the last successfully * parse character. On parse failure, does not change. * @see Formattable * @stable ICU 2.0 */ void parse(const UnicodeString& text, Formattable& result, ParsePosition& parsePosition) const override; /** * Parses text from the given string as a currency amount. Unlike * the parse() method, this method will attempt to parse a generic * currency name, searching for a match of this object's locale's * currency display names, or for a 3-letter ISO currency code. * This method will fail if this format is not a currency format, * that is, if it does not contain the currency pattern symbol * (U+00A4) in its prefix or suffix. * * @param text the string to parse * @param pos input-output position; on input, the position within text * to match; must have 0 <= pos.getIndex() < text.length(); * on output, the position after the last matched character. * If the parse fails, the position in unchanged upon output. * @return if parse succeeds, a pointer to a newly-created CurrencyAmount * object (owned by the caller) containing information about * the parsed currency; if parse fails, this is nullptr. * @stable ICU 49 */ CurrencyAmount* parseCurrency(const UnicodeString& text, ParsePosition& pos) const override; /** * Returns the decimal format symbols, which is generally not changed * by the programmer or user. * @return desired DecimalFormatSymbols * @see DecimalFormatSymbols * @stable ICU 2.0 */ virtual const DecimalFormatSymbols* getDecimalFormatSymbols(void) const; /** * Sets the decimal format symbols, which is generally not changed * by the programmer or user. * @param symbolsToAdopt DecimalFormatSymbols to be adopted. * @stable ICU 2.0 */ virtual void adoptDecimalFormatSymbols(DecimalFormatSymbols* symbolsToAdopt); /** * Sets the decimal format symbols, which is generally not changed * by the programmer or user. * @param symbols DecimalFormatSymbols. * @stable ICU 2.0 */ virtual void setDecimalFormatSymbols(const DecimalFormatSymbols& symbols); /** * Returns the currency plural format information, * which is generally not changed by the programmer or user. * @return desired CurrencyPluralInfo * @stable ICU 4.2 */ virtual const CurrencyPluralInfo* getCurrencyPluralInfo(void) const; /** * Sets the currency plural format information, * which is generally not changed by the programmer or user. * @param toAdopt CurrencyPluralInfo to be adopted. * @stable ICU 4.2 */ virtual void adoptCurrencyPluralInfo(CurrencyPluralInfo* toAdopt); /** * Sets the currency plural format information, * which is generally not changed by the programmer or user. * @param info Currency Plural Info. * @stable ICU 4.2 */ virtual void setCurrencyPluralInfo(const CurrencyPluralInfo& info); /** * Get the positive prefix. * * @param result Output param which will receive the positive prefix. * @return A reference to 'result'. * Examples: +123, $123, sFr123 * @stable ICU 2.0 */ UnicodeString& getPositivePrefix(UnicodeString& result) const; /** * Set the positive prefix. * * @param newValue the new value of the the positive prefix to be set. * Examples: +123, $123, sFr123 * @stable ICU 2.0 */ virtual void setPositivePrefix(const UnicodeString& newValue); /** * Get the negative prefix. * * @param result Output param which will receive the negative prefix. * @return A reference to 'result'. * Examples: -123, ($123) (with negative suffix), sFr-123 * @stable ICU 2.0 */ UnicodeString& getNegativePrefix(UnicodeString& result) const; /** * Set the negative prefix. * * @param newValue the new value of the the negative prefix to be set. * Examples: -123, ($123) (with negative suffix), sFr-123 * @stable ICU 2.0 */ virtual void setNegativePrefix(const UnicodeString& newValue); /** * Get the positive suffix. * * @param result Output param which will receive the positive suffix. * @return A reference to 'result'. * Example: 123% * @stable ICU 2.0 */ UnicodeString& getPositiveSuffix(UnicodeString& result) const; /** * Set the positive suffix. * * @param newValue the new value of the positive suffix to be set. * Example: 123% * @stable ICU 2.0 */ virtual void setPositiveSuffix(const UnicodeString& newValue); /** * Get the negative suffix. * * @param result Output param which will receive the negative suffix. * @return A reference to 'result'. * Examples: -123%, ($123) (with positive suffixes) * @stable ICU 2.0 */ UnicodeString& getNegativeSuffix(UnicodeString& result) const; /** * Set the negative suffix. * * @param newValue the new value of the negative suffix to be set. * Examples: 123% * @stable ICU 2.0 */ virtual void setNegativeSuffix(const UnicodeString& newValue); /** * Whether to show the plus sign on positive (non-negative) numbers; for example, "+12" * * For more control over sign display, use NumberFormatter. * * @return Whether the sign is shown on positive numbers and zero. * @stable ICU 64 */ UBool isSignAlwaysShown() const; /** * Set whether to show the plus sign on positive (non-negative) numbers; for example, "+12". * * For more control over sign display, use NumberFormatter. * * @param value true to always show a sign; false to hide the sign on positive numbers and zero. * @stable ICU 64 */ void setSignAlwaysShown(UBool value); /** * Get the multiplier for use in percent, permill, etc. * For a percentage, set the suffixes to have "%" and the multiplier to be 100. * (For Arabic, use arabic percent symbol). * For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000. * * The number may also be multiplied by a power of ten; see getMultiplierScale(). * * @return the multiplier for use in percent, permill, etc. * Examples: with 100, 1.23 -> "123", and "123" -> 1.23 * @stable ICU 2.0 */ int32_t getMultiplier(void) const; /** * Set the multiplier for use in percent, permill, etc. * For a percentage, set the suffixes to have "%" and the multiplier to be 100. * (For Arabic, use arabic percent symbol). * For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000. * * This method only supports integer multipliers. To multiply by a non-integer, pair this * method with setMultiplierScale(). * * @param newValue the new value of the multiplier for use in percent, permill, etc. * Examples: with 100, 1.23 -> "123", and "123" -> 1.23 * @stable ICU 2.0 */ virtual void setMultiplier(int32_t newValue); /** * Gets the power of ten by which number should be multiplied before formatting, which * can be combined with setMultiplier() to multiply by any arbitrary decimal value. * * A multiplier scale of 2 corresponds to multiplication by 100, and a multiplier scale * of -2 corresponds to multiplication by 0.01. * * This method is analogous to UNUM_SCALE in getAttribute. * * @return the current value of the power-of-ten multiplier. * @stable ICU 62 */ int32_t getMultiplierScale(void) const; /** * Sets a power of ten by which number should be multiplied before formatting, which * can be combined with setMultiplier() to multiply by any arbitrary decimal value. * * A multiplier scale of 2 corresponds to multiplication by 100, and a multiplier scale * of -2 corresponds to multiplication by 0.01. * * For example, to multiply numbers by 0.5 before formatting, you can do: * *
* df.setMultiplier(5);
* df.setMultiplierScale(-1);
*
*
* This method is analogous to UNUM_SCALE in setAttribute.
*
* @param newValue the new value of the power-of-ten multiplier.
* @stable ICU 62
*/
void setMultiplierScale(int32_t newValue);
/**
* Get the rounding increment.
* @return A positive rounding increment, or 0.0 if a custom rounding
* increment is not in effect.
* @see #setRoundingIncrement
* @see #getRoundingMode
* @see #setRoundingMode
* @stable ICU 2.0
*/
virtual double getRoundingIncrement(void) const;
/**
* Set the rounding increment. In the absence of a rounding increment,
* numbers will be rounded to the number of digits displayed.
* @param newValue A positive rounding increment, or 0.0 to
* use the default rounding increment.
* Negative increments are equivalent to 0.0.
* @see #getRoundingIncrement
* @see #getRoundingMode
* @see #setRoundingMode
* @stable ICU 2.0
*/
virtual void setRoundingIncrement(double newValue);
/**
* Get the rounding mode.
* @return A rounding mode
* @see #setRoundingIncrement
* @see #getRoundingIncrement
* @see #setRoundingMode
* @stable ICU 2.0
*/
virtual ERoundingMode getRoundingMode(void) const override;
/**
* Set the rounding mode.
* @param roundingMode A rounding mode
* @see #setRoundingIncrement
* @see #getRoundingIncrement
* @see #getRoundingMode
* @stable ICU 2.0
*/
virtual void setRoundingMode(ERoundingMode roundingMode) override;
/**
* Get the width to which the output of format() is padded.
* The width is counted in 16-bit code units.
* @return the format width, or zero if no padding is in effect
* @see #setFormatWidth
* @see #getPadCharacterString
* @see #setPadCharacter
* @see #getPadPosition
* @see #setPadPosition
* @stable ICU 2.0
*/
virtual int32_t getFormatWidth(void) const;
/**
* Set the width to which the output of format() is padded.
* The width is counted in 16-bit code units.
* This method also controls whether padding is enabled.
* @param width the width to which to pad the result of
* format(), or zero to disable padding. A negative
* width is equivalent to 0.
* @see #getFormatWidth
* @see #getPadCharacterString
* @see #setPadCharacter
* @see #getPadPosition
* @see #setPadPosition
* @stable ICU 2.0
*/
virtual void setFormatWidth(int32_t width);
/**
* Get the pad character used to pad to the format width. The
* default is ' '.
* @return a string containing the pad character. This will always
* have a length of one 32-bit code point.
* @see #setFormatWidth
* @see #getFormatWidth
* @see #setPadCharacter
* @see #getPadPosition
* @see #setPadPosition
* @stable ICU 2.0
*/
virtual UnicodeString getPadCharacterString() const;
/**
* Set the character used to pad to the format width. If padding
* is not enabled, then this will take effect if padding is later
* enabled.
* @param padChar a string containing the pad character. If the string
* has length 0, then the pad character is set to ' '. Otherwise
* padChar.char32At(0) will be used as the pad character.
* @see #setFormatWidth
* @see #getFormatWidth
* @see #getPadCharacterString
* @see #getPadPosition
* @see #setPadPosition
* @stable ICU 2.0
*/
virtual void setPadCharacter(const UnicodeString& padChar);
/**
* Get the position at which padding will take place. This is the location
* at which padding will be inserted if the result of format()
* is shorter than the format width.
* @return the pad position, one of kPadBeforePrefix,
* kPadAfterPrefix, kPadBeforeSuffix, or
* kPadAfterSuffix.
* @see #setFormatWidth
* @see #getFormatWidth
* @see #setPadCharacter
* @see #getPadCharacterString
* @see #setPadPosition
* @see #EPadPosition
* @stable ICU 2.0
*/
virtual EPadPosition getPadPosition(void) const;
/**
* Set the position at which padding will take place. This is the location
* at which padding will be inserted if the result of format()
* is shorter than the format width. This has no effect unless padding is
* enabled.
* @param padPos the pad position, one of kPadBeforePrefix,
* kPadAfterPrefix, kPadBeforeSuffix, or
* kPadAfterSuffix.
* @see #setFormatWidth
* @see #getFormatWidth
* @see #setPadCharacter
* @see #getPadCharacterString
* @see #getPadPosition
* @see #EPadPosition
* @stable ICU 2.0
*/
virtual void setPadPosition(EPadPosition padPos);
/**
* Return whether or not scientific notation is used.
* @return true if this object formats and parses scientific notation
* @see #setScientificNotation
* @see #getMinimumExponentDigits
* @see #setMinimumExponentDigits
* @see #isExponentSignAlwaysShown
* @see #setExponentSignAlwaysShown
* @stable ICU 2.0
*/
virtual UBool isScientificNotation(void) const;
/**
* Set whether or not scientific notation is used. When scientific notation
* is used, the effective maximum number of integer digits is <= 8. If the
* maximum number of integer digits is set to more than 8, the effective
* maximum will be 1. This allows this call to generate a 'default' scientific
* number format without additional changes.
* @param useScientific true if this object formats and parses scientific
* notation
* @see #isScientificNotation
* @see #getMinimumExponentDigits
* @see #setMinimumExponentDigits
* @see #isExponentSignAlwaysShown
* @see #setExponentSignAlwaysShown
* @stable ICU 2.0
*/
virtual void setScientificNotation(UBool useScientific);
/**
* Return the minimum exponent digits that will be shown.
* @return the minimum exponent digits that will be shown
* @see #setScientificNotation
* @see #isScientificNotation
* @see #setMinimumExponentDigits
* @see #isExponentSignAlwaysShown
* @see #setExponentSignAlwaysShown
* @stable ICU 2.0
*/
virtual int8_t getMinimumExponentDigits(void) const;
/**
* Set the minimum exponent digits that will be shown. This has no
* effect unless scientific notation is in use.
* @param minExpDig a value >= 1 indicating the fewest exponent digits
* that will be shown. Values less than 1 will be treated as 1.
* @see #setScientificNotation
* @see #isScientificNotation
* @see #getMinimumExponentDigits
* @see #isExponentSignAlwaysShown
* @see #setExponentSignAlwaysShown
* @stable ICU 2.0
*/
virtual void setMinimumExponentDigits(int8_t minExpDig);
/**
* Return whether the exponent sign is always shown.
* @return true if the exponent is always prefixed with either the
* localized minus sign or the localized plus sign, false if only negative
* exponents are prefixed with the localized minus sign.
* @see #setScientificNotation
* @see #isScientificNotation
* @see #setMinimumExponentDigits
* @see #getMinimumExponentDigits
* @see #setExponentSignAlwaysShown
* @stable ICU 2.0
*/
virtual UBool isExponentSignAlwaysShown(void) const;
/**
* Set whether the exponent sign is always shown. This has no effect
* unless scientific notation is in use.
* @param expSignAlways true if the exponent is always prefixed with either
* the localized minus sign or the localized plus sign, false if only
* negative exponents are prefixed with the localized minus sign.
* @see #setScientificNotation
* @see #isScientificNotation
* @see #setMinimumExponentDigits
* @see #getMinimumExponentDigits
* @see #isExponentSignAlwaysShown
* @stable ICU 2.0
*/
virtual void setExponentSignAlwaysShown(UBool expSignAlways);
/**
* Return the grouping size. Grouping size is the number of digits between
* grouping separators in the integer portion of a number. For example,
* in the number "123,456.78", the grouping size is 3.
*
* @return the grouping size.
* @see setGroupingSize
* @see NumberFormat::isGroupingUsed
* @see DecimalFormatSymbols::getGroupingSeparator
* @stable ICU 2.0
*/
int32_t getGroupingSize(void) const;
/**
* Set the grouping size. Grouping size is the number of digits between
* grouping separators in the integer portion of a number. For example,
* in the number "123,456.78", the grouping size is 3.
*
* @param newValue the new value of the grouping size.
* @see getGroupingSize
* @see NumberFormat::setGroupingUsed
* @see DecimalFormatSymbols::setGroupingSeparator
* @stable ICU 2.0
*/
virtual void setGroupingSize(int32_t newValue);
/**
* Return the secondary grouping size. In some locales one
* grouping interval is used for the least significant integer
* digits (the primary grouping size), and another is used for all
* others (the secondary grouping size). A formatter supporting a
* secondary grouping size will return a positive integer unequal
* to the primary grouping size returned by
* getGroupingSize(). For example, if the primary
* grouping size is 4, and the secondary grouping size is 2, then
* the number 123456789 formats as "1,23,45,6789", and the pattern
* appears as "#,##,###0".
* @return the secondary grouping size, or a value less than
* one if there is none
* @see setSecondaryGroupingSize
* @see NumberFormat::isGroupingUsed
* @see DecimalFormatSymbols::getGroupingSeparator
* @stable ICU 2.4
*/
int32_t getSecondaryGroupingSize(void) const;
/**
* Set the secondary grouping size. If set to a value less than 1,
* then secondary grouping is turned off, and the primary grouping
* size is used for all intervals, not just the least significant.
*
* @param newValue the new value of the secondary grouping size.
* @see getSecondaryGroupingSize
* @see NumberFormat#setGroupingUsed
* @see DecimalFormatSymbols::setGroupingSeparator
* @stable ICU 2.4
*/
virtual void setSecondaryGroupingSize(int32_t newValue);
/**
* Returns the minimum number of grouping digits.
* Grouping separators are output if there are at least this many
* digits to the left of the first (rightmost) grouping separator,
* that is, there are at least (minimum grouping + grouping size) integer digits.
* (Subject to isGroupingUsed().)
*
* For example, if this value is 2, and the grouping size is 3, then
* 9999 -> "9999" and 10000 -> "10,000"
*
* The default value for this attribute is 0.
* A value of 1, 0, or lower, means that the use of grouping separators
* only depends on the grouping size (and on isGroupingUsed()).
*
* NOTE: The CLDR data is used in NumberFormatter but not in DecimalFormat.
* This is for backwards compatibility reasons.
*
* For more control over grouping strategies, use NumberFormatter.
*
* @see setMinimumGroupingDigits
* @see getGroupingSize
* @stable ICU 64
*/
int32_t getMinimumGroupingDigits() const;
/**
* Sets the minimum grouping digits. Setting the value to
* - 1: Turns off minimum grouping digits.
* - 0 or -1: The behavior is undefined.
* - UNUM_MINIMUM_GROUPING_DIGITS_AUTO: Display grouping using the default
* strategy for all locales.
* - UNUM_MINIMUM_GROUPING_DIGITS_MIN2: Display grouping using locale
* defaults, except do not show grouping on values smaller than 10000
* (such that there is a minimum of two digits before the first
* separator).
*
* For more control over grouping strategies, use NumberFormatter.
*
* @param newValue the new value of minimum grouping digits.
* @see getMinimumGroupingDigits
* @stable ICU 64
*/
void setMinimumGroupingDigits(int32_t newValue);
/**
* Allows you to get the behavior of the decimal separator with integers.
* (The decimal separator will always appear with decimals.)
*
* @return true if the decimal separator always appear with decimals.
* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
* @stable ICU 2.0
*/
UBool isDecimalSeparatorAlwaysShown(void) const;
/**
* Allows you to set the behavior of the decimal separator with integers.
* (The decimal separator will always appear with decimals.)
*
* @param newValue set true if the decimal separator will always appear with decimals.
* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
* @stable ICU 2.0
*/
virtual void setDecimalSeparatorAlwaysShown(UBool newValue);
/**
* Allows you to get the parse behavior of the pattern decimal mark.
*
* @return true if input must contain a match to decimal mark in pattern
* @stable ICU 54
*/
UBool isDecimalPatternMatchRequired(void) const;
/**
* Allows you to set the parse behavior of the pattern decimal mark.
*
* if true, the input must have a decimal mark if one was specified in the pattern. When
* false the decimal mark may be omitted from the input.
*
* @param newValue set true if input must contain a match to decimal mark in pattern
* @stable ICU 54
*/
virtual void setDecimalPatternMatchRequired(UBool newValue);
/**
* Returns whether to ignore exponents when parsing.
*
* @return Whether to ignore exponents when parsing.
* @see #setParseNoExponent
* @stable ICU 64
*/
UBool isParseNoExponent() const;
/**
* Specifies whether to stop parsing when an exponent separator is encountered. For
* example, parses "123E4" to 123 (with parse position 3) instead of 1230000 (with parse position
* 5).
*
* @param value true to prevent exponents from being parsed; false to allow them to be parsed.
* @stable ICU 64
*/
void setParseNoExponent(UBool value);
/**
* Returns whether parsing is sensitive to case (lowercase/uppercase).
*
* @return Whether parsing is case-sensitive.
* @see #setParseCaseSensitive
* @stable ICU 64
*/
UBool isParseCaseSensitive() const;
/**
* Whether to pay attention to case when parsing; default is to ignore case (perform
* case-folding). For example, "A" == "a" in case-insensitive but not case-sensitive mode.
*
* Currency symbols are never case-folded. For example, "us$1.00" will not parse in case-insensitive
* mode, even though "US$1.00" parses.
*
* @param value true to enable case-sensitive parsing (the default); false to force
* case-sensitive parsing behavior.
* @stable ICU 64
*/
void setParseCaseSensitive(UBool value);
/**
* Returns whether truncation of high-order integer digits should result in an error.
* By default, setMaximumIntegerDigits truncates high-order digits silently.
*
* @return Whether an error code is set if high-order digits are truncated.
* @see setFormatFailIfMoreThanMaxDigits
* @stable ICU 64
*/
UBool isFormatFailIfMoreThanMaxDigits() const;
/**
* Sets whether truncation of high-order integer digits should result in an error.
* By default, setMaximumIntegerDigits truncates high-order digits silently.
*
* @param value Whether to set an error code if high-order digits are truncated.
* @stable ICU 64
*/
void setFormatFailIfMoreThanMaxDigits(UBool value);
/**
* Synthesizes a pattern string that represents the current state
* of this Format object.
*
* @param result Output param which will receive the pattern.
* Previous contents are deleted.
* @return A reference to 'result'.
* @see applyPattern
* @stable ICU 2.0
*/
virtual UnicodeString& toPattern(UnicodeString& result) const;
/**
* Synthesizes a localized pattern string that represents the current
* state of this Format object.
*
* @param result Output param which will receive the localized pattern.
* Previous contents are deleted.
* @return A reference to 'result'.
* @see applyPattern
* @stable ICU 2.0
*/
virtual UnicodeString& toLocalizedPattern(UnicodeString& result) const;
/**
* Apply the given pattern to this Format object. A pattern is a
* short-hand specification for the various formatting properties.
* These properties can also be changed individually through the
* various setter methods.
* * There is no limit to integer digits are set * by this routine, since that is the typical end-user desire; * use setMaximumInteger if you want to set a real value. * For negative numbers, use a second pattern, separated by a semicolon *
* . Example "#,#00.0#" -> 1,234.56
*
* This means a minimum of 2 integer digits, 1 fraction digit, and
* a maximum of 2 fraction digits.
*
* . Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses.
*
* In negative patterns, the minimum and maximum counts are ignored;
* these are presumed to be set in the positive pattern.
*
* @param pattern The pattern to be applied.
* @param parseError Struct to receive information on position
* of error if an error is encountered
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
* @stable ICU 2.0
*/
virtual void applyPattern(const UnicodeString& pattern, UParseError& parseError, UErrorCode& status);
/**
* Sets the pattern.
* @param pattern The pattern to be applied.
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
* @stable ICU 2.0
*/
virtual void applyPattern(const UnicodeString& pattern, UErrorCode& status);
/**
* Apply the given pattern to this Format object. The pattern
* is assumed to be in a localized notation. A pattern is a
* short-hand specification for the various formatting properties.
* These properties can also be changed individually through the
* various setter methods.
* * There is no limit to integer digits are set * by this routine, since that is the typical end-user desire; * use setMaximumInteger if you want to set a real value. * For negative numbers, use a second pattern, separated by a semicolon *
* . Example "#,#00.0#" -> 1,234.56
*
* This means a minimum of 2 integer digits, 1 fraction digit, and
* a maximum of 2 fraction digits.
*
* Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses.
*
* In negative patterns, the minimum and maximum counts are ignored;
* these are presumed to be set in the positive pattern.
*
* @param pattern The localized pattern to be applied.
* @param parseError Struct to receive information on position
* of error if an error is encountered
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
* @stable ICU 2.0
*/
virtual void applyLocalizedPattern(const UnicodeString& pattern, UParseError& parseError,
UErrorCode& status);
/**
* Apply the given pattern to this Format object.
*
* @param pattern The localized pattern to be applied.
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
* @stable ICU 2.0
*/
virtual void applyLocalizedPattern(const UnicodeString& pattern, UErrorCode& status);
/**
* Sets the maximum number of digits allowed in the integer portion of a
* number. This override limits the integer digit count to 309.
*
* @param newValue the new value of the maximum number of digits
* allowed in the integer portion of a number.
* @see NumberFormat#setMaximumIntegerDigits
* @stable ICU 2.0
*/
void setMaximumIntegerDigits(int32_t newValue) override;
/**
* Sets the minimum number of digits allowed in the integer portion of a
* number. This override limits the integer digit count to 309.
*
* @param newValue the new value of the minimum number of digits
* allowed in the integer portion of a number.
* @see NumberFormat#setMinimumIntegerDigits
* @stable ICU 2.0
*/
void setMinimumIntegerDigits(int32_t newValue) override;
/**
* Sets the maximum number of digits allowed in the fraction portion of a
* number. This override limits the fraction digit count to 340.
*
* @param newValue the new value of the maximum number of digits
* allowed in the fraction portion of a number.
* @see NumberFormat#setMaximumFractionDigits
* @stable ICU 2.0
*/
void setMaximumFractionDigits(int32_t newValue) override;
/**
* Sets the minimum number of digits allowed in the fraction portion of a
* number. This override limits the fraction digit count to 340.
*
* @param newValue the new value of the minimum number of digits
* allowed in the fraction portion of a number.
* @see NumberFormat#setMinimumFractionDigits
* @stable ICU 2.0
*/
void setMinimumFractionDigits(int32_t newValue) override;
/**
* Returns the minimum number of significant digits that will be
* displayed. This value has no effect unless areSignificantDigitsUsed()
* returns true.
* @return the fewest significant digits that will be shown
* @stable ICU 3.0
*/
int32_t getMinimumSignificantDigits() const;
/**
* Returns the maximum number of significant digits that will be
* displayed. This value has no effect unless areSignificantDigitsUsed()
* returns true.
* @return the most significant digits that will be shown
* @stable ICU 3.0
*/
int32_t getMaximumSignificantDigits() const;
/**
* Sets the minimum number of significant digits that will be
* displayed. If min is less than one then it is set
* to one. If the maximum significant digits count is less than
* min, then it is set to min.
* This function also enables the use of significant digits
* by this formatter - areSignificantDigitsUsed() will return true.
* @see #areSignificantDigitsUsed
* @param min the fewest significant digits to be shown
* @stable ICU 3.0
*/
void setMinimumSignificantDigits(int32_t min);
/**
* Sets the maximum number of significant digits that will be
* displayed. If max is less than one then it is set
* to one. If the minimum significant digits count is greater
* than max, then it is set to max.
* This function also enables the use of significant digits
* by this formatter - areSignificantDigitsUsed() will return true.
* @see #areSignificantDigitsUsed
* @param max the most significant digits to be shown
* @stable ICU 3.0
*/
void setMaximumSignificantDigits(int32_t max);
/**
* Returns true if significant digits are in use, or false if
* integer and fraction digit counts are in use.
* @return true if significant digits are in use
* @stable ICU 3.0
*/
UBool areSignificantDigitsUsed() const;
/**
* Sets whether significant digits are in use, or integer and
* fraction digit counts are in use.
* @param useSignificantDigits true to use significant digits, or
* false to use integer and fraction digit counts
* @stable ICU 3.0
*/
void setSignificantDigitsUsed(UBool useSignificantDigits);
/**
* Sets the currency used to display currency
* amounts. This takes effect immediately, if this format is a
* currency format. If this format is not a currency format, then
* the currency is used if and when this object becomes a
* currency format through the application of a new pattern.
* @param theCurrency a 3-letter ISO code indicating new currency
* to use. It need not be null-terminated. May be the empty
* string or nullptr to indicate no currency.
* @param ec input-output error code
* @stable ICU 3.0
*/
void setCurrency(const char16_t* theCurrency, UErrorCode& ec) override;
#ifndef U_FORCE_HIDE_DEPRECATED_API
/**
* Sets the currency used to display currency amounts. See
* setCurrency(const char16_t*, UErrorCode&).
* @deprecated ICU 3.0. Use setCurrency(const char16_t*, UErrorCode&).
*/
virtual void setCurrency(const char16_t* theCurrency);
#endif // U_FORCE_HIDE_DEPRECATED_API
/**
* Sets the `Currency Usage` object used to display currency.
* This takes effect immediately, if this format is a
* currency format.
* @param newUsage new currency usage object to use.
* @param ec input-output error code
* @stable ICU 54
*/
void setCurrencyUsage(UCurrencyUsage newUsage, UErrorCode* ec);
/**
* Returns the `Currency Usage` object used to display currency
* @stable ICU 54
*/
UCurrencyUsage getCurrencyUsage() const;
#ifndef U_HIDE_INTERNAL_API
/**
* Format a number and save it into the given DecimalQuantity.
* Internal, not intended for public use.
* @internal
*/
void formatToDecimalQuantity(double number, number::impl::DecimalQuantity& output,
UErrorCode& status) const;
/**
* Get a DecimalQuantity corresponding to a formattable as it would be
* formatted by this DecimalFormat.
* Internal, not intended for public use.
* @internal
*/
void formatToDecimalQuantity(const Formattable& number, number::impl::DecimalQuantity& output,
UErrorCode& status) const;
#endif /* U_HIDE_INTERNAL_API */
/**
* Converts this DecimalFormat to a (Localized)NumberFormatter. Starting
* in ICU 60, NumberFormatter is the recommended way to format numbers.
* You can use the returned LocalizedNumberFormatter to format numbers and
* get a FormattedNumber, which contains a string as well as additional
* annotations about the formatted value.
*
* If a memory allocation failure occurs, the return value of this method
* might be null. If you are concerned about correct recovery from
* out-of-memory situations, use this pattern:
*
*
* FormattedNumber result;
* if (auto* ptr = df->toNumberFormatter(status)) {
* result = ptr->formatDouble(123, status);
* }
*
*
* If you are not concerned about out-of-memory situations, or if your
* environment throws exceptions when memory allocation failure occurs,
* you can chain the methods, like this:
*
*
* FormattedNumber result = df
* ->toNumberFormatter(status)
* ->formatDouble(123, status);
*
*
* NOTE: The returned LocalizedNumberFormatter is owned by this DecimalFormat.
* If a non-const method is called on the DecimalFormat, or if the DecimalFormat
* is deleted, the object becomes invalid. If you plan to keep the return value
* beyond the lifetime of the DecimalFormat, copy it to a local variable:
*
*
* LocalizedNumberFormatter lnf;
* if (auto* ptr = df->toNumberFormatter(status)) {
* lnf = *ptr;
* }
*
*
* @param status Set on failure, like U_MEMORY_ALLOCATION_ERROR.
* @return A pointer to an internal object, or nullptr on failure.
* Do not delete the return value!
* @stable ICU 64
*/
const number::LocalizedNumberFormatter* toNumberFormatter(UErrorCode& status) const;
/**
* Return the class ID for this class. This is useful only for
* comparing to a return value from getDynamicClassID(). For example:
*
* . Base* polymorphic_pointer = createPolymorphicObject();
* . if (polymorphic_pointer->getDynamicClassID() ==
* . Derived::getStaticClassID()) ...
*
* @return The class ID for all objects of this class.
* @stable ICU 2.0
*/
static UClassID U_EXPORT2 getStaticClassID(void);
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override.
* This method is to implement a simple version of RTTI, since not all
* C++ compilers support genuine RTTI. Polymorphic operator==() and
* clone() methods call this method.
*
* @return The class ID for this object. All objects of a
* given class have the same class ID. Objects of
* other classes have different class IDs.
* @stable ICU 2.0
*/
UClassID getDynamicClassID(void) const override;
private:
/** Rebuilds the formatter object from the property bag. */
void touch(UErrorCode& status);
/** Rebuilds the formatter object, ignoring any error code. */
void touchNoError();
/**
* Updates the property bag with settings from the given pattern.
*
* @param pattern The pattern string to parse.
* @param ignoreRounding Whether to leave out rounding information (minFrac, maxFrac, and rounding
* increment) when parsing the pattern. This may be desirable if a custom rounding mode, such
* as CurrencyUsage, is to be used instead. One of {@link
* PatternStringParser#IGNORE_ROUNDING_ALWAYS}, {@link PatternStringParser#IGNORE_ROUNDING_IF_CURRENCY},
* or {@link PatternStringParser#IGNORE_ROUNDING_NEVER}.
* @see PatternAndPropertyUtils#parseToExistingProperties
*/
void setPropertiesFromPattern(const UnicodeString& pattern, int32_t ignoreRounding,
UErrorCode& status);
const numparse::impl::NumberParserImpl* getParser(UErrorCode& status) const;
const numparse::impl::NumberParserImpl* getCurrencyParser(UErrorCode& status) const;
static void fieldPositionHelper(
const number::impl::UFormattedNumberData& formatted,
FieldPosition& fieldPosition,
int32_t offset,
UErrorCode& status);
static void fieldPositionIteratorHelper(
const number::impl::UFormattedNumberData& formatted,
FieldPositionIterator* fpi,
int32_t offset,
UErrorCode& status);
void setupFastFormat();
bool fastFormatDouble(double input, UnicodeString& output) const;
bool fastFormatInt64(int64_t input, UnicodeString& output) const;
void doFastFormatInt32(int32_t input, bool isNegative, UnicodeString& output) const;
//=====================================================================================//
// INSTANCE FIELDS //
//=====================================================================================//
// One instance field for the implementation, keep all fields inside of an implementation
// class defined in number_mapper.h
number::impl::DecimalFormatFields* fields = nullptr;
// Allow child class CompactDecimalFormat to access fProperties:
friend class CompactDecimalFormat;
// Allow MeasureFormat to use fieldPositionHelper:
friend class MeasureFormat;
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // _DECIMFMT
//eof