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diff --git a/intl/icu/source/i18n/unicode/decimfmt.h b/intl/icu/source/i18n/unicode/decimfmt.h new file mode 100644 index 0000000000..f72ba68725 --- /dev/null +++ b/intl/icu/source/i18n/unicode/decimfmt.h @@ -0,0 +1,2212 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************** +* Copyright (C) 1997-2016, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************** +* +* File DECIMFMT.H +* +* Modification History: +* +* Date Name Description +* 02/19/97 aliu Converted from java. +* 03/20/97 clhuang Updated per C++ implementation. +* 04/03/97 aliu Rewrote parsing and formatting completely, and +* cleaned up and debugged. Actually works now. +* 04/17/97 aliu Changed DigitCount to int per code review. +* 07/10/97 helena Made ParsePosition a class and get rid of the function +* hiding problems. +* 09/09/97 aliu Ported over support for exponential formats. +* 07/20/98 stephen Changed documentation +* 01/30/13 emmons Added Scaling methods +******************************************************************************** +*/ + +#ifndef DECIMFMT_H +#define DECIMFMT_H + +#include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + +/** + * \file + * \brief C++ API: Compatibility APIs for decimal formatting. + */ + +#if !UCONFIG_NO_FORMATTING + +#include "unicode/dcfmtsym.h" +#include "unicode/numfmt.h" +#include "unicode/locid.h" +#include "unicode/fpositer.h" +#include "unicode/stringpiece.h" +#include "unicode/curramt.h" +#include "unicode/enumset.h" + +U_NAMESPACE_BEGIN + +class CurrencyPluralInfo; +class CompactDecimalFormat; + +namespace number { +class LocalizedNumberFormatter; +namespace impl { +class DecimalQuantity; +struct DecimalFormatFields; +class UFormattedNumberData; +} +} + +namespace numparse { +namespace impl { +class NumberParserImpl; +} +} + +/** + * **IMPORTANT:** New users are strongly encouraged to see if + * numberformatter.h fits their use case. Although not deprecated, this header + * is provided for backwards compatibility only. + * + * DecimalFormat is a concrete subclass of NumberFormat that formats decimal + * numbers. It has a variety of features designed to make it possible to parse + * and format numbers in any locale, including support for Western, Arabic, or + * Indic digits. It also supports different flavors of numbers, including + * integers ("123"), fixed-point numbers ("123.4"), scientific notation + * ("1.23E4"), percentages ("12%"), and currency amounts ("$123", "USD123", + * "123 US dollars"). All of these flavors can be easily localized. + * + * To obtain a NumberFormat for a specific locale (including the default + * locale) call one of NumberFormat's factory methods such as + * createInstance(). Do not call the DecimalFormat constructors directly, unless + * you know what you are doing, since the NumberFormat factory methods may + * return subclasses other than DecimalFormat. + * + * **Example Usage** + * + * \code + * // Normally we would have a GUI with a menu for this + * int32_t locCount; + * const Locale* locales = NumberFormat::getAvailableLocales(locCount); + * + * double myNumber = -1234.56; + * UErrorCode success = U_ZERO_ERROR; + * NumberFormat* form; + * + * // Print out a number with the localized number, currency and percent + * // format for each locale. + * UnicodeString countryName; + * UnicodeString displayName; + * UnicodeString str; + * UnicodeString pattern; + * Formattable fmtable; + * for (int32_t j = 0; j < 3; ++j) { + * cout << endl << "FORMAT " << j << endl; + * for (int32_t i = 0; i < locCount; ++i) { + * if (locales[i].getCountry(countryName).size() == 0) { + * // skip language-only + * continue; + * } + * switch (j) { + * case 0: + * form = NumberFormat::createInstance(locales[i], success ); break; + * case 1: + * form = NumberFormat::createCurrencyInstance(locales[i], success ); break; + * default: + * form = NumberFormat::createPercentInstance(locales[i], success ); break; + * } + * if (form) { + * str.remove(); + * pattern = ((DecimalFormat*)form)->toPattern(pattern); + * cout << locales[i].getDisplayName(displayName) << ": " << pattern; + * cout << " -> " << form->format(myNumber,str) << endl; + * form->parse(form->format(myNumber,str), fmtable, success); + * delete form; + * } + * } + * } + * \endcode + * + * **Another example use createInstance(style)** + * + * \code + * // Print out a number using the localized number, currency, + * // percent, scientific, integer, iso currency, and plural currency + * // format for each locale</strong> + * Locale* locale = new Locale("en", "US"); + * double myNumber = 1234.56; + * UErrorCode success = U_ZERO_ERROR; + * UnicodeString str; + * Formattable fmtable; + * for (int j=NumberFormat::kNumberStyle; + * j<=NumberFormat::kPluralCurrencyStyle; + * ++j) { + * NumberFormat* form = NumberFormat::createInstance(locale, j, success); + * str.remove(); + * cout << "format result " << form->format(myNumber, str) << endl; + * format->parse(form->format(myNumber, str), fmtable, success); + * delete form; + * } + * \endcode + * + * + * <p><strong>Patterns</strong> + * + * <p>A DecimalFormat consists of a <em>pattern</em> and a set of + * <em>symbols</em>. 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. + * + * <p><strong>Special Pattern Characters</strong> + * + * <p>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. + * + * <p>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. + * + * <p>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. + * + * <table border=0 cellspacing=3 cellpadding=0> + * <tr bgcolor="#ccccff"> + * <td align=left><strong>Symbol</strong> + * <td align=left><strong>Location</strong> + * <td align=left><strong>Localized?</strong> + * <td align=left><strong>Meaning</strong> + * <tr valign=top> + * <td><code>0</code> + * <td>Number + * <td>Yes + * <td>Digit + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>1-9</code> + * <td>Number + * <td>Yes + * <td>'1' through '9' indicate rounding. + * <tr valign=top> + * <td><code>\htmlonly@\endhtmlonly</code> <!--doxygen doesn't like @--> + * <td>Number + * <td>No + * <td>Significant digit + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>#</code> + * <td>Number + * <td>Yes + * <td>Digit, zero shows as absent + * <tr valign=top> + * <td><code>.</code> + * <td>Number + * <td>Yes + * <td>Decimal separator or monetary decimal separator + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>-</code> + * <td>Number + * <td>Yes + * <td>Minus sign + * <tr valign=top> + * <td><code>,</code> + * <td>Number + * <td>Yes + * <td>Grouping separator + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>E</code> + * <td>Number + * <td>Yes + * <td>Separates mantissa and exponent in scientific notation. + * <em>Need not be quoted in prefix or suffix.</em> + * <tr valign=top> + * <td><code>+</code> + * <td>Exponent + * <td>Yes + * <td>Prefix positive exponents with localized plus sign. + * <em>Need not be quoted in prefix or suffix.</em> + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>;</code> + * <td>Subpattern boundary + * <td>Yes + * <td>Separates positive and negative subpatterns + * <tr valign=top> + * <td><code>\%</code> + * <td>Prefix or suffix + * <td>Yes + * <td>Multiply by 100 and show as percentage + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>\\u2030</code> + * <td>Prefix or suffix + * <td>Yes + * <td>Multiply by 1000 and show as per mille + * <tr valign=top> + * <td><code>\htmlonly¤\endhtmlonly</code> (<code>\\u00A4</code>) + * <td>Prefix or suffix + * <td>No + * <td>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. + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>'</code> + * <td>Prefix or suffix + * <td>No + * <td>Used to quote special characters in a prefix or suffix, + * for example, <code>"'#'#"</code> formats 123 to + * <code>"#123"</code>. To create a single quote + * itself, use two in a row: <code>"# o''clock"</code>. + * <tr valign=top> + * <td><code>*</code> + * <td>Prefix or suffix boundary + * <td>Yes + * <td>Pad escape, precedes pad character + * </table> + * + * <p>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#)". + * + * <p>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. + * + * <p>The <em>grouping separator</em> 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 <em>grouping + * size</em> 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 + * <em>primary grouping size</em>, and one used for all others, the + * <em>secondary grouping size</em>. 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 "#,##,###,####" == "###,###,####" == "##,#,###,####". + * + * <p>Illegal patterns, such as "#.#.#" or "#.###,###", will cause + * DecimalFormat to set a failing UErrorCode. + * + * <p><strong>Pattern BNF</strong> + * + * <pre> + * 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 + * </pre> + * The first subpattern is for positive numbers. The second (optional) + * subpattern is for negative numbers. + * + * <p>Not indicated in the BNF syntax above: + * + * <ul><li>The grouping separator ',' can occur inside the integer and + * sigDigits elements, between any two pattern characters of that + * element, as long as the integer or sigDigits element is not + * followed by the exponent element. + * + * <li>Two grouping intervals are recognized: That between the + * decimal point and the first grouping symbol, and that + * between the first and second grouping symbols. These + * intervals are identical in most locales, but in some + * locales they differ. For example, the pattern + * "#,##,###" formats the number 123456789 as + * "12,34,56,789".</li> + * + * <li>The pad specifier <code>padSpec</code> may appear before the prefix, + * after the prefix, before the suffix, after the suffix, or not at all. + * + * <li>In place of '0', the digits '1' through '9' may be used to + * indicate a rounding increment. + * </ul> + * + * <p><strong>Parsing</strong> + * + * <p>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. + * + * <p>During parsing, grouping separators are ignored if in lenient mode; + * otherwise, if present, they must be in appropriate positions. + * + * <p>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". + * + * <p>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. + * + * <p><strong>Formatting</strong> + * + * <p>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 <a href="#sci">scientific + * notation</a> or <a href="#sigdig">significant digits</a>. + * + * <ul><li>If the number of actual integer digits exceeds the + * <em>maximum integer digits</em>, then only the least significant + * digits are shown. For example, 1997 is formatted as "97" if the + * maximum integer digits is set to 2. + * + * <li>If the number of actual integer digits is less than the + * <em>minimum integer digits</em>, then leading zeros are added. For + * example, 1997 is formatted as "01997" if the minimum integer digits + * is set to 5. + * + * <li>If the number of actual fraction digits exceeds the <em>maximum + * fraction digits</em>, then rounding is performed to the + * maximum fraction digits. For example, 0.125 is formatted as "0.12" + * if the maximum fraction digits is 2. This behavior can be changed + * by specifying a rounding increment and/or a rounding mode. + * + * <li>If the number of actual fraction digits is less than the + * <em>minimum fraction digits</em>, then trailing zeros are added. + * For example, 0.125 is formatted as "0.1250" if the minimum fraction + * digits is set to 4. + * + * <li>Trailing fractional zeros are not displayed if they occur + * <em>j</em> positions after the decimal, where <em>j</em> is less + * than the maximum fraction digits. For example, 0.10004 is + * formatted as "0.1" if the maximum fraction digits is four or less. + * </ul> + * + * <p><strong>Special Values</strong> + * + * <p><code>NaN</code> is represented as a single character, typically + * <code>\\uFFFD</code>. This character is determined by the + * DecimalFormatSymbols object. This is the only value for which + * the prefixes and suffixes are not used. + * + * <p>Infinity is represented as a single character, typically + * <code>\\u221E</code>, with the positive or negative prefixes and suffixes + * applied. The infinity character is determined by the + * DecimalFormatSymbols object. + * + * <a name="sci"><strong>Scientific Notation</strong></a> + * + * <p>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 10<sup>3</sup>. 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". + * + * <ul> + * <li>The number of digit characters after the exponent character gives the + * minimum exponent digit count. There is no maximum. Negative exponents are + * formatted using the localized minus sign, <em>not</em> the prefix and suffix + * from the pattern. This allows patterns such as "0.###E0 m/s". To prefix + * positive exponents with a localized plus sign, specify '+' between the + * exponent and the digits: "0.###E+0" will produce formats "1E+1", "1E+0", + * "1E-1", etc. (In localized patterns, use the localized plus sign rather than + * '+'.) + * + * <li>The minimum number of integer digits is achieved by adjusting the + * exponent. Example: 0.00123 formatted with "00.###E0" yields "12.3E-4". This + * only happens if there is no maximum number of integer digits. If there is a + * maximum, then the minimum number of integer digits is fixed at one. + * + * <li>The maximum number of integer digits, if present, specifies the exponent + * grouping. The most common use of this is to generate <em>engineering + * notation</em>, in which the exponent is a multiple of three, e.g., + * "##0.###E0". The number 12345 is formatted using "##0.####E0" as "12.345E3". + * + * <li>When using scientific notation, the formatter controls the + * digit counts using significant digits logic. The maximum number of + * significant digits limits the total number of integer and fraction + * digits that will be shown in the mantissa; it does not affect + * parsing. For example, 12345 formatted with "##0.##E0" is "12.3E3". + * See the section on significant digits for more details. + * + * <li>The number of significant digits shown is determined as + * follows: If areSignificantDigitsUsed() returns false, then the + * minimum number of significant digits shown is one, and the maximum + * number of significant digits shown is the sum of the <em>minimum + * integer</em> and <em>maximum fraction</em> digits, and is + * unaffected by the maximum integer digits. If this sum is zero, + * then all significant digits are shown. If + * areSignificantDigitsUsed() returns true, then the significant digit + * counts are specified by getMinimumSignificantDigits() and + * getMaximumSignificantDigits(). In this case, the number of + * integer digits is fixed at one, and there is no exponent grouping. + * + * <li>Exponential patterns may not contain grouping separators. + * </ul> + * + * <a name="sigdig"><strong>Significant Digits</strong></a> + * + * <code>DecimalFormat</code> 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: + * + * <table border=0 cellspacing=3 cellpadding=0> + * <tr bgcolor="#ccccff"> + * <td align=left>Pattern + * <td align=left>Minimum significant digits + * <td align=left>Maximum significant digits + * <td align=left>Number + * <td align=left>Output of format() + * <tr valign=top> + * <td><code>\@\@\@</code> + * <td>3 + * <td>3 + * <td>12345 + * <td><code>12300</code> + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>\@\@\@</code> + * <td>3 + * <td>3 + * <td>0.12345 + * <td><code>0.123</code> + * <tr valign=top> + * <td><code>\@\@##</code> + * <td>2 + * <td>4 + * <td>3.14159 + * <td><code>3.142</code> + * <tr valign=top bgcolor="#eeeeff"> + * <td><code>\@\@##</code> + * <td>2 + * <td>4 + * <td>1.23004 + * <td><code>1.23</code> + * </table> + * + * <ul> + * <li>Significant digit counts may be expressed using patterns that + * specify a minimum and maximum number of significant digits. These + * are indicated by the <code>'@'</code> and <code>'#'</code> + * characters. The minimum number of significant digits is the number + * of <code>'@'</code> characters. The maximum number of significant + * digits is the number of <code>'@'</code> characters plus the number + * of <code>'#'</code> characters following on the right. For + * example, the pattern <code>"@@@"</code> indicates exactly 3 + * significant digits. The pattern <code>"@##"</code> 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 + * <code>"@##"</code> formats the number 0.1203 as + * <code>"0.12"</code>. + * + * <li>If a pattern uses significant digits, it may not contain a + * decimal separator, nor the <code>'0'</code> pattern character. + * Patterns such as <code>"@00"</code> or <code>"@.###"</code> are + * disallowed. + * + * <li>Any number of <code>'#'</code> characters may be prepended to + * the left of the leftmost <code>'@'</code> character. These have no + * effect on the minimum and maximum significant digits counts, but + * may be used to position grouping separators. For example, + * <code>"#,#@#"</code> indicates a minimum of one significant digits, + * a maximum of two significant digits, and a grouping size of three. + * + * <li>In order to enable significant digits formatting, use a pattern + * containing the <code>'@'</code> pattern character. Alternatively, + * call setSignificantDigitsUsed(true). + * + * <li>In order to disable significant digits formatting, use a + * pattern that does not contain the <code>'@'</code> pattern + * character. Alternatively, call setSignificantDigitsUsed(false). + * + * <li>The number of significant digits has no effect on parsing. + * + * <li>Significant digits may be used together with exponential notation. Such + * patterns are equivalent to a normal exponential pattern with a minimum and + * maximum integer digit count of one, a minimum fraction digit count of + * <code>getMinimumSignificantDigits() - 1</code>, and a maximum fraction digit + * count of <code>getMaximumSignificantDigits() - 1</code>. For example, the + * pattern <code>"@@###E0"</code> is equivalent to <code>"0.0###E0"</code>. + * + * <li>If significant digits are in use, then the integer and fraction + * digit counts, as set via the API, are ignored. If significant + * digits are not in use, then the significant digit counts, as set via + * the API, are ignored. + * + * </ul> + * + * <p><strong>Padding</strong> + * + * <p>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, <code>"$*x#,##0.00"</code> formats 123 to + * <code>"$xx123.00"</code>, and 1234 to <code>"$1,234.00"</code>. + * + * <ul> + * <li>When padding is in effect, the width of the positive subpattern, + * including prefix and suffix, determines the format width. For example, in + * the pattern <code>"* #0 o''clock"</code>, the format width is 10. + * + * <li>The width is counted in 16-bit code units (char16_ts). + * + * <li>Some parameters which usually do not matter have meaning when padding is + * used, because the pattern width is significant with padding. In the pattern + * "* ##,##,#,##0.##", the format width is 14. The initial characters "##,##," + * do not affect the grouping size or maximum integer digits, but they do affect + * the format width. + * + * <li>Padding may be inserted at one of four locations: before the prefix, + * after the prefix, before the suffix, or after the suffix. If padding is + * specified in any other location, applyPattern() + * sets a failing UErrorCode. If there is no prefix, + * before the prefix and after the prefix are equivalent, likewise for the + * suffix. + * + * <li>When specified in a pattern, the 32-bit code point immediately + * following the pad escape is the pad character. This may be any character, + * including a special pattern character. That is, the pad escape + * <em>escapes</em> the following character. If there is no character after + * the pad escape, then the pattern is illegal. + * + * </ul> + * + * <p><strong>Rounding</strong> + * + * <p>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. + * + * <p>In the absence of an explicit rounding increment numbers are + * rounded to their formatted width. + * + * <ul> + * <li>Rounding only affects the string produced by formatting. It does + * not affect parsing or change any numerical values. + * + * <li>A <em>rounding mode</em> determines how values are rounded; see + * DecimalFormat::ERoundingMode. The default rounding mode is + * DecimalFormat::kRoundHalfEven. The rounding mode can only be set + * through the API; it can not be set with a pattern. + * + * <li>Some locales use rounding in their currency formats to reflect the + * smallest currency denomination. + * + * <li>In a pattern, digits '1' through '9' specify rounding, but otherwise + * behave identically to digit '0'. + * </ul> + * + * <p><strong>Synchronization</strong> + * + * <p>DecimalFormat objects are not synchronized. Multiple + * threads should not access one formatter concurrently. + * + * <p><strong>Subclassing</strong> + * + * <p><em>User subclasses are not supported.</em> 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. + * <P> + * 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. + * <p> + * <strong>NOTE:</strong> 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. + * <P> + * 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. + * <p> + * <strong>NOTE:</strong> 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. + * <P> + * 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. + * <p> + * <strong>NOTE:</strong> 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. + * <P> + * 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. + * <p> + * <strong>NOTE:</strong> 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. + * <P> + * 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. + * <p> + * <strong>NOTE:</strong> 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: + * + * <pre> + * df.setMultiplier(5); + * df.setMultiplierScale(-1); + * </pre> + * + * 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. + * <P> + * 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 + * <pre> + * . Example "#,#00.0#" -> 1,234.56 + * </pre> + * This means a minimum of 2 integer digits, 1 fraction digit, and + * a maximum of 2 fraction digits. + * <pre> + * . Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses. + * </pre> + * 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. + * <P> + * 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 + * <pre> + * . Example "#,#00.0#" -> 1,234.56 + * </pre> + * 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 <code>min</code> is less than one then it is set + * to one. If the maximum significant digits count is less than + * <code>min</code>, then it is set to <code>min</code>. + * 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 <code>max</code> is less than one then it is set + * to one. If the minimum significant digits count is greater + * than <code>max</code>, then it is set to <code>max</code>. + * 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: + * + * <pre> + * FormattedNumber result; + * if (auto* ptr = df->toNumberFormatter(status)) { + * result = ptr->formatDouble(123, status); + * } + * </pre> + * + * 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: + * + * <pre> + * FormattedNumber result = df + * ->toNumberFormatter(status) + * ->formatDouble(123, status); + * </pre> + * + * 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: + * + * <pre> + * LocalizedNumberFormatter lnf; + * if (auto* ptr = df->toNumberFormatter(status)) { + * lnf = *ptr; + * } + * </pre> + * + * @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: + * <pre> + * . Base* polymorphic_pointer = createPolymorphicObject(); + * . if (polymorphic_pointer->getDynamicClassID() == + * . Derived::getStaticClassID()) ... + * </pre> + * @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 |