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gecko-dev/modules/libnls/headers/decimfmt.h

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/*
********************************************************************************
* *
* COPYRIGHT: *
* (C) Copyright Taligent, Inc., 1997 *
* (C) Copyright International Business Machines Corporation, 1997 *
* Licensed Material - Program-Property of IBM - All Rights Reserved. *
* US Government Users Restricted Rights - Use, duplication, or disclosure *
* restricted by GSA ADP Schedule Contract with IBM Corp. *
* *
********************************************************************************
*
* 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.
********************************************************************************
*/
#ifndef _DECIMFMT
#define _DECIMFMT
#include "ptypes.h"
#include "numfmt.h"
#include "locid.h"
class DecimalFormatSymbols;
class DigitList;
/**
* Concrete class for formatting decimal numbers, allowing a variety
* of parameters, and localization to Western, Arabic, or Indic numbers.
* <P>
* Normally, you get the proper NumberFormat for a specific locale
* (including the default locale) using the NumberFormat factory methods,
* rather than constructing a DecimalNumberFormat directly.
* <P>
* Either the prefixes or the suffixes must be different for the parse
* to distinguish positive from negative. Parsing will be unreliable
* if the digits, thousands or decimal separators are the same, or if
* any of them occur in the prefixes or suffixes.
* <P>
* [Special cases:]
* <P>
* NaN is formatted as a single character, typically \\uFFFD.
* <P>
* +/-Infinity is formatted as a single character, typically \\u221E,
* plus the positive and negative pre/suffixes.
* <P>
* Note: this class is designed for common users; for very large or small
* numbers, use a format that can express exponential values.
* <P>
* [Example:]
* <pre>
* . // normally we would have a GUI with a menu for this
* . long count;
* . Locale* locales = NumberFormat::getAvailableLocales(count);
*
* . double myNumber = -1234.56;
* . NumberFormat* form;
*
* . // just for fun, we print out a number with the locale number, currency
* . // and percent format for each locale we can.
* . for (int j = 0; j &lt; 3; ++j) {
* . cout &lt;&lt; "FORMAT" &lt;&lt; endl;
* . for (int i = 0; i &lt; count; ++i) {
* . if (locales[i]->getCountry().length() == 0) {
* . // skip language-only
* . continue;
* . }
* . cout &lt;&lt; locales[i]->getDisplayName();
* . switch (j) {
* . default:
* . form = NumberFormat::getInstance(*locales[i]); break;
* . case 1:
* . form = NumberFormat::getDefaultCurrency(*locales[i]); break;
* . case 0:
* . form = NumberFormat::getDefaultPercent(*locales[i]); break;
* . }
* . UnicodeString str;
* . ErrorCode status;
* . UnicodeString pattern;
* . if (form->getDynamicClassID() == DecimalFormat::getStaticClassID())
* . ((DecimalFormat*)form)->toPattern(pattern);
* . cout &lt;&lt; ": " &lt;&lt; pattern
* . &lt;&lt; " -> " &lt;&lt; form->format(myNumber, str);
* . cout &lt;&lt; " -> " &lt;&lt; form->parse(form->format(myNumber, str), status)
* . &lt;&lt; endl;
* . }
* . }
* </pre>
* [The following shows the structure of the pattern.]
* <pre>
* . pattern := subpattern{;subpattern}
* . subpattern := {prefix}integer{.fraction}{suffix}
* .
* . prefix := '\\u0000'..'\\uFFFD' - specialCharacters
* . suffix := '\\u0000'..'\\uFFFD' - specialCharacters
* . integer := '#'* '0'* '0'
* . fraction := '0'* '#'*
*
* Notation:
* . X* 0 or more instances of X
* . (X | Y) either X or Y.
* . X..Y any character from X up to Y, inclusive.
* . S - T characters in S, except those in T
* </pre>
* The first subpattern is for positive numbers. The second (optional)
* subpattern is used for negative numbers. (In both cases, ',' can
* occur inside the integer portion--it is just too messy to indicate
* in BNF.) For the second subpattern, only the PREFIX and SUFFIX are
* noted; other attributes are taken only from the first subpattern.
* <P>
* Here are the special characters used in the parts of the
* subpattern, with notes on their usage.
* <pre>
* . Symbol Meaning
* . 0 a digit, showing up a zero if it is zero
* . # a digit, supressed if zero
* . . placeholder for decimal separator
* . , placeholder for grouping separator
* . ; separates postive from negative formats
* . - default negative prefix
* . % divide by 100 and show as percentage
* . X any other characters can be used in the prefix or suffix
* . ' used to quote special characters in a prefix or suffix
* </pre>
* [Notes]
* <P>
* If there is no explicit negative subpattern, - is prefixed to the
* positive form. That is, "0.00" alone is equivalent to "0.00;-0.00".
* <P>
* Illegal formats, such as "#.#.#" in the same format, will cause a
* failing ErrorCode to be returned.
* <P>
* The grouping separator is commonly used for thousands, but in some
* countries for ten-thousands. The interval is a constant number of
* digits between the grouping characters, such as 100,000,000 or 1,0000,0000.
* If you supply a pattern with multiple grouping characters, the interval
* between the last one and the end of the integer is the one that is
* used. So "#,##,###,####" == "######,####" == "##,####,####".
* <P>
* This class only handles localized digits where the 10 digits are
* contiguous in Unicode, from 0 to 9. Other digits sets (such as
* superscripts) would need a different subclass.
*/
#ifdef NLS_MAC
#pragma export on
#endif
class T_FORMAT_API DecimalFormat: public NumberFormat {
public:
/**
* 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 getNumberInstance. These factories will
* return the most appropriate sub-class of NumberFormat for a given
* locale.
* @param status Output param set to success/failure code. If the
* pattern is invalid this will be set to a failure code.
*/
DecimalFormat(ErrorCode& 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 getNumberInstance. These factories will
* return the most appropriate sub-class of NumberFormat for a given
* locale.
* @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.
*/
DecimalFormat(const UnicodeString& pattern,
ErrorCode& 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
* getInstance or getCurrencyInstance. If you need only minor adjustments
* to a standard format, you can modify the format returned by
* a NumberFormat factory method.
*
* @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.
*/
DecimalFormat( const UnicodeString& pattern,
DecimalFormatSymbols* symbolsToAdopt,
ErrorCode& 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
* getInstance or getCurrencyInstance. If you need only minor adjustments
* to a standard format, you can modify the format returned by
* a NumberFormat factory method.
*
* @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.
*/
DecimalFormat( const UnicodeString& pattern,
const DecimalFormatSymbols& symbols,
ErrorCode& status);
/**
* Copy constructor.
*/
DecimalFormat(const DecimalFormat& source);
/**
* Assignment operator.
*/
DecimalFormat& operator=(const DecimalFormat& rhs);
/**
* Destructor.
*/
virtual ~DecimalFormat();
/**
* Clone this Format object polymorphically. The caller owns the
* result and should delete it when done.
*/
virtual Format* clone() const;
/**
* Return true if the given Format objects are semantically equal.
* Objects of different subclasses are considered unequal.
*/
virtual t_bool operator==(const Format& other) const;
/**
* Format a double or long number using base-10 representation.
*
* @param number The value to be formatted.
* @param toAppendTo The string to append the formatted string to.
* This is an output parameter.
* @param pos On input: an alignment field, if desired.
* On output: the offsets of the alignment field.
* @return A reference to 'toAppendTo'.
*/
virtual UnicodeString& format(double number,
UnicodeString& toAppendTo,
FieldPosition& pos) const;
virtual UnicodeString& format(long number,
UnicodeString& toAppendTo,
FieldPosition& pos) const;
virtual UnicodeString& format(const Formattable& obj,
UnicodeString& toAppendTo,
FieldPosition& pos,
ErrorCode& status) const;
/**
* 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 NULL is
* returned.
*
* @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.
*/
virtual void parse(const UnicodeString& text,
Formattable& result,
ParsePosition& parsePosition) const;
// Declare here again to get rid of function hiding problems.
virtual void parse(const UnicodeString& text,
Formattable& result,
ErrorCode& error) const;
/**
* Returns the decimal format symbols, which is generally not changed
* by the programmer or user.
* @return desired DecimalFormatSymbols
* @see DecimalFormatSymbols
*/
virtual const DecimalFormatSymbols* getDecimalFormatSymbols() const;
/**
* Sets the decimal format symbols, which is generally not changed
* by the programmer or user.
* @param symbolsToAdopt DecimalFormatSymbols to be adopted.
*/
virtual void adoptDecimalFormatSymbols(DecimalFormatSymbols* symbolsToAdopt);
/**
* Sets the decimal format symbols, which is generally not changed
* by the programmer or user.
* @param symbols DecimalFormatSymbols.
*/
virtual void setDecimalFormatSymbols(const DecimalFormatSymbols& symbols);
/**
* Get the positive prefix.
*
* Examples: +123, $123, sFr123
*/
UnicodeString& getPositivePrefix(UnicodeString& result) const;
/**
* Set the positive prefix.
*
* Examples: +123, $123, sFr123
*/
virtual void setPositivePrefix(const UnicodeString& newValue);
/**
* Get the negative prefix.
*
* Examples: -123, ($123) (with negative suffix), sFr-123
*/
UnicodeString& getNegativePrefix(UnicodeString& result) const;
/**
* Set the negative prefix.
*
* Examples: -123, ($123) (with negative suffix), sFr-123
*/
virtual void setNegativePrefix(const UnicodeString& newValue);
/**
* Get the positive suffix.
*
* Example: 123%
*/
UnicodeString& getPositiveSuffix(UnicodeString& result) const;
/**
* Set the positive suffix.
*
* Example: 123%
*/
virtual void setPositiveSuffix(const UnicodeString& newValue);
/**
* Get the negative suffix.
*
* Examples: -123%, ($123) (with positive suffixes)
*/
UnicodeString& getNegativeSuffix(UnicodeString& result) const;
/**
* Set the positive suffix.
*
* Examples: 123%
*/
virtual void setNegativeSuffix(const UnicodeString& newValue);
/**
* 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.
*
* Examples: with 100, 1.23 -> "123", and "123" -> 1.23
*/
t_int32 getMultiplier() 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.
*
* Examples: with 100, 1.23 -> "123", and "123" -> 1.23
*/
virtual void setMultiplier(t_int32 newValue);
/**
* 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.
* @see setGroupingSize
* @see NumberFormat::isGroupingUsed
* @see DecimalFormatSymbols::getGroupingSeparator
*/
int getGroupingSize() 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.
* @see getGroupingSize
* @see NumberFormat::setGroupingUsed
* @see DecimalFormatSymbols::setGroupingSeparator
*/
virtual void setGroupingSize(int newValue);
/**
* Allows you to get the behavior of the decimal separator with integers.
* (The decimal separator will always appear with decimals.)
*
* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
*/
t_bool isDecimalSeparatorAlwaysShown() const;
/**
* Allows you to set the behavior of the decimal separator with integers.
* (The decimal separator will always appear with decimals.)
*
* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
*/
virtual void setDecimalSeparatorAlwaysShown(t_bool newValue);
/**
* Synthesizes a pattern string that represents the current state
* of this Format object.
* @see applyPattern
*/
virtual UnicodeString& toPattern(UnicodeString& result) const;
/**
* Synthesizes a localized pattern string that represents the current
* state of this Format object.
*
* @see applyPattern
*/
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 parantheses.
* </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 status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
*/
virtual void applyPattern(const UnicodeString& pattern,
ErrorCode& 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 parantheses.
*
* 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 status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
*/
virtual void applyLocalizedPattern(const UnicodeString& pattern,
ErrorCode& status);
/**
* The resource tags we use to retrieve decimal format data from
* locale resource bundles.
*/
static const UnicodeString kNumberPatterns;
public:
/**
* 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.
*/
static ClassID getStaticClassID() { return (ClassID)&fgClassID; }
/**
* 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.
*/
virtual ClassID getDynamicClassID() const { return getStaticClassID(); }
private:
static char fgClassID;
/**
* Do real work of constructing a new DecimalFormat.
*/
void construct(ErrorCode& status,
const UnicodeString* pattern = 0,
DecimalFormatSymbols* symbolsToAdopt = 0,
const Locale& locale = Locale::getDefault());
/**
* Does the real work of generating a pattern.
*/
UnicodeString& toPattern(UnicodeString& result, t_bool localized) const;
/**
* Does the real work of applying a pattern.
* @param pattern The pattern to be applied.
* @param localized If true, the pattern is localized; else false.
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
*/
void applyPattern(const UnicodeString& pattern,
t_bool localized,
ErrorCode& status);
/**
* Do the work of formatting a number, either a double or a long.
*/
UnicodeString& subformat(UnicodeString& result,
FieldPosition& fieldPosition,
t_bool isNegative,
t_bool isInteger) const;
static const int STATUS_INFINITE;
static const int STATUS_POSITIVE;
static const int STATUS_LENGTH;
/**
* Parse the given text into a number. The text is parsed beginning at
* parsePosition, until an unparseable character is seen.
* @param text The string to parse.
* @param parsePosition The position at which to being parsing. Upon
* return, the first unparseable character.
* @param digits The DigitList to set to the parsed value.
* @param isExponent If true, parse an exponent. This means no
* infinite values and integer only.
* @param status Upon return contains boolean status flags indicating
* whether the value was infinite and whether it was positive.
*/
t_bool subparse(const UnicodeString& text, ParsePosition& parsePosition,
DigitList& digits, t_bool isExponent,
t_bool* status) const;
/**
* Constants.
*/
static const t_int8 kMaxDigit; // The largest digit, in this case 9
/*transient*/ DigitList* digitList;
UnicodeString fPositivePrefix;
UnicodeString fPositiveSuffix;
UnicodeString fNegativePrefix;
UnicodeString fNegativeSuffix;
t_int32 fMultiplier;
int fGroupingSize;
t_bool fDecimalSeparatorAlwaysShown;
/*transient*/ t_bool isCurrencyFormat;
DecimalFormatSymbols* fSymbols;
t_bool useExponentialNotation;
t_int8 minExponentDigits;
// Constants for characters used in programmatic (unlocalized) patterns.
static const UniChar PATTERN_ZERO_DIGIT;
static const UniChar PATTERN_GROUPING_SEPARATOR;
static const UniChar PATTERN_DECIMAL_SEPARATOR;
static const UniChar PATTERN_PER_MILLE;
static const UniChar PATTERN_PERCENT;
static const UniChar PATTERN_DIGIT;
static const UniChar PATTERN_SEPARATOR;
static const UniChar PATTERN_EXPONENT;
/**
* The CURRENCY_SIGN is the standard Unicode symbol for currency. It
* is used in patterns and substitued with either the currency symbol,
* or if it is doubled, with the international currency symbol. If the
* CURRENCY_SIGN is seen in a pattern, then the decimal separator is
* replaced with the monetary decimal separator.
*/
static const UniChar CURRENCY_SIGN;
static const UniChar QUOTE;
};
#ifdef NLS_MAC
#pragma export off
#endif
#endif // _DECIMFMT
//eof
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