| /* |
| * Copyright © {1997-1999}, International Business Machines Corporation and others. All Rights Reserved. |
| ******************************************************************************** |
| * |
| * File NUMFMT.H |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 02/19/97 aliu Converted from java. |
| * 03/18/97 clhuang Updated per C++ implementation. |
| * 04/17/97 aliu Changed DigitCount to int per code review. |
| * 07/20/98 stephen JDK 1.2 sync up. Added scientific support. |
| * Changed naming conventions to match C++ guidelines |
| * Derecated Java style constants (eg, INTEGER_FIELD) |
| ******************************************************************************** |
| */ |
| |
| #ifndef NUMFMT_H |
| #define NUMFMT_H |
| |
| |
| #include "unicode/utypes.h" |
| #include "unicode/unistr.h" |
| #include "unicode/format.h" |
| |
| class Locale; |
| |
| /** |
| * Abstract base class for all number formats. Provides interface for |
| * formatting and parsing a number. Also provides methods for |
| * determining which locales have number formats, and what their names |
| * are. |
| * <P> |
| * NumberFormat helps you to format and parse numbers for any locale. |
| * Your code can be completely independent of the locale conventions |
| * for decimal points, thousands-separators, or even the particular |
| * decimal digits used, or whether the number format is even decimal. |
| * <P> |
| * To format a number for the current Locale, use one of the static |
| * factory methods: |
| * <pre> |
| * . double myNumber = 7.0; |
| * . UnicodeString myString; |
| * . UErrorCode success = U_ZERO_ERROR; |
| * . NumberFormat* nf = NumberFormat::createInstance(success) |
| * . nf->format(myNumber, myString); |
| * . cout << " Example 1: " << myString << endl; |
| * </pre> |
| * If you are formatting multiple numbers, it is more efficient to get |
| * the format and use it multiple times so that the system doesn't |
| * have to fetch the information about the local language and country |
| * conventions multiple times. |
| * <pre> |
| * . UnicodeString myString; |
| * . UErrorCode success = U_ZERO_ERROR; |
| * . nf = NumberFormat::createInstance( success ); |
| * . int32_t a[] = { 123, 3333, -1234567 }; |
| * . const int32_t a_len = sizeof(a) / sizeof(a[0]); |
| * . myString.remove(); |
| * . for (int32_t i = 0; i < a_len; i++) { |
| * . nf->format(a[i], myString); |
| * . myString += " ; "; |
| * . } |
| * . cout << " Example 2: " << myString << endl; |
| * </pre> |
| * To format a number for a different Locale, specify it in the |
| * call to createInstance(). |
| * <pre> |
| * . nf = NumberFormat::createInstance( Locale::FRENCH, success ); |
| * </pre> |
| * You can use a NumberFormat to parse also. |
| * <pre> |
| * . UErrorCode success; |
| * . Formattable result(-999); // initialized with error code |
| * . nf->parse(myString, result, success); |
| * </pre> |
| * Use createInstance to get the normal number format for that country. |
| * There are other static factory methods available. Use getCurrency |
| * to get the currency number format for that country. Use getPercent |
| * to get a format for displaying percentages. With this format, a |
| * fraction from 0.53 is displayed as 53%. |
| * <P> |
| * You can also control the display of numbers with such methods as |
| * getMinimumFractionDigits. If you want even more control over the |
| * format or parsing, or want to give your users more control, you can |
| * try casting the NumberFormat you get from the factory methods to a |
| * DecimalNumberFormat. This will work for the vast majority of |
| * countries; just remember to put it in a try block in case you |
| * encounter an unusual one. |
| * <P> |
| * You can also use forms of the parse and format methods with |
| * ParsePosition and FieldPosition to allow you to: |
| * <ul type=round> |
| * <li>(a) progressively parse through pieces of a string. |
| * <li>(b) align the decimal point and other areas. |
| * </ul> |
| * For example, you can align numbers in two ways. |
| * <P> |
| * If you are using a monospaced font with spacing for alignment, you |
| * can pass the FieldPosition in your format call, with field = |
| * INTEGER_FIELD. On output, getEndIndex will be set to the offset |
| * between the last character of the integer and the decimal. Add |
| * (desiredSpaceCount - getEndIndex) spaces at the front of the |
| * string. |
| * <P> |
| * If you are using proportional fonts, instead of padding with |
| * spaces, measure the width of the string in pixels from the start to |
| * getEndIndex. Then move the pen by (desiredPixelWidth - |
| * widthToAlignmentPoint) before drawing the text. It also works |
| * where there is no decimal, but possibly additional characters at |
| * the end, e.g. with parentheses in negative numbers: "(12)" for -12. |
| * @stable |
| */ |
| class U_I18N_API NumberFormat : public Format { |
| public: |
| |
| /** |
| * Alignment Field constants used to construct a FieldPosition object. |
| * Signifies that the position of the integer part or fraction part of |
| * a formatted number should be returned. |
| * |
| * @see FieldPosition |
| * @stable |
| */ |
| enum EAlignmentFields { |
| kIntegerField, |
| kFractionField, |
| |
| |
| /** |
| * These constants are provided for backwards compatibility only, |
| * and are deprecated. Please use the C++ style constants defined above. |
| * @stable |
| */ |
| INTEGER_FIELD = kIntegerField, |
| FRACTION_FIELD = kFractionField |
| }; |
| |
| virtual ~NumberFormat(); |
| |
| /** |
| * Return true if the given Format objects are semantically equal. |
| * Objects of different subclasses are considered unequal. |
| * @stable |
| */ |
| virtual UBool operator==(const Format& other) const; |
| |
| /** |
| * Format an object to produce a string. This method handles |
| * Formattable objects with numeric types. If the Formattable |
| * object type is not a numeric type, then it returns a failing |
| * UErrorCode. |
| * |
| * @param obj The object to format. |
| * @param toAppendTo Where the text is to be appended. |
| * @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 The value passed in as toAppendTo (this allows chaining, |
| * as with UnicodeString::append()) |
| * @stable |
| */ |
| virtual UnicodeString& format(const Formattable& obj, |
| UnicodeString& toAppendTo, |
| FieldPosition& pos, |
| UErrorCode& status) const; |
| |
| /** |
| * Parse a string to produce an object. This methods handles |
| * parsing of numeric strings into Formattable objects with numeric |
| * types. |
| * <P> |
| * Before calling, set parse_pos.index to the offset you want to |
| * start parsing at in the source. After calling, parse_pos.index |
| * is the end of the text you parsed. If error occurs, index is |
| * unchanged. |
| * <P> |
| * When parsing, leading whitespace is discarded (with successful |
| * parse), while trailing whitespace is left as is. |
| * <P> |
| * See Format::parseObject() for more. |
| * |
| * @param source The string to be parsed into an object. |
| * @param result Formattable to be set to the parse result. |
| * If parse fails, return contents are undefined. |
| * @param parse_pos The position to start parsing at. Upon return |
| * this param is set to the position after the |
| * last character successfully parsed. If the |
| * source is not parsed successfully, this param |
| * will remain unchanged. |
| * @return A newly created Formattable* object, or NULL |
| * on failure. The caller owns this and should |
| * delete it when done. |
| * @stable |
| */ |
| virtual void parseObject(const UnicodeString& source, |
| Formattable& result, |
| ParsePosition& parse_pos) const; |
| |
| /** |
| * Format a double or long number. These methods call the NumberFormat |
| * pure virtual format() methods with the default FieldPosition. |
| * |
| * @param number The value to be formatted. |
| * @param output Output param with the formatted string. |
| * @return A reference to 'output' param. |
| * @stable |
| */ |
| UnicodeString& format( double number, |
| UnicodeString& output) const; |
| |
| UnicodeString& format( int32_t number, |
| UnicodeString& output) const; |
| |
| /** |
| * Format a double or long number. Concrete subclasses must implement |
| * these pure virtual methods. |
| * |
| * @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'. |
| * @stable |
| */ |
| virtual UnicodeString& format(double number, |
| UnicodeString& toAppendTo, |
| FieldPosition& pos) const = 0; |
| virtual UnicodeString& format(int32_t number, |
| UnicodeString& toAppendTo, |
| FieldPosition& pos) const = 0; |
| |
| /** |
| * Redeclared Format method. |
| * @stable |
| */ |
| UnicodeString& format(const Formattable& obj, |
| UnicodeString& result, |
| UErrorCode& status) const; |
| |
| /** |
| * Return a long if possible (e.g. within range LONG_MAX, |
| * LONG_MAX], and with no decimals), otherwise a double. If |
| * IntegerOnly is set, will stop at a decimal point (or equivalent; |
| * e.g. for rational numbers "1 2/3", will stop after the 1). |
| * <P> |
| * If no object can be parsed, index is unchanged, and NULL is |
| * returned. |
| * <P> |
| * This is a pure virtual which concrete subclasses must implement. |
| * |
| * @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. |
| * @return A Formattable object of numeric type. The caller |
| * owns this an must delete it. NULL on failure. |
| * @stable |
| */ |
| virtual void parse(const UnicodeString& text, |
| Formattable& result, |
| ParsePosition& parsePosition) const = 0; |
| |
| /** |
| * Parse a string as a numeric value, and return a Formattable |
| * numeric object. This method parses integers only if IntegerOnly |
| * is set. |
| * |
| * @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 status Success or failure output parameter. |
| * @return A Formattable object of numeric type. The caller |
| * owns this an must delete it. NULL on failure. |
| * @see NumberFormat::isParseIntegerOnly |
| * @stable |
| */ |
| virtual void parse( const UnicodeString& text, |
| Formattable& result, |
| UErrorCode& status) const; |
| |
| /** |
| * Return true if this format will parse numbers as integers |
| * only. For example in the English locale, with ParseIntegerOnly |
| * true, the string "1234." would be parsed as the integer value |
| * 1234 and parsing would stop at the "." character. Of course, |
| * the exact format accepted by the parse operation is locale |
| * dependant and determined by sub-classes of NumberFormat. |
| * @stable |
| */ |
| UBool isParseIntegerOnly(void) const; |
| |
| /** |
| * Sets whether or not numbers should be parsed as integers only. |
| * @see isParseIntegerOnly |
| * @stable |
| */ |
| virtual void setParseIntegerOnly(UBool value); |
| |
| /** |
| * Returns the default number format for the current default |
| * locale. The default format is one of the styles provided by |
| * the other factory methods: getNumberInstance, |
| * getCurrencyInstance or getPercentInstance. Exactly which one |
| * is locale dependant. |
| * @stable |
| */ |
| static NumberFormat* createInstance(UErrorCode&); |
| |
| /** |
| * Returns the default number format for the specified locale. |
| * The default format is one of the styles provided by the other |
| * factory methods: getNumberInstance, getCurrencyInstance or |
| * getPercentInstance. Exactly which one is locale dependant. |
| * @stable |
| */ |
| static NumberFormat* createInstance(const Locale& inLocale, |
| UErrorCode&); |
| |
| /** |
| * Returns a currency format for the current default locale. |
| * @stable |
| */ |
| static NumberFormat* createCurrencyInstance(UErrorCode&); |
| |
| /** |
| * Returns a currency format for the specified locale. |
| * @stable |
| */ |
| static NumberFormat* createCurrencyInstance(const Locale& inLocale, |
| UErrorCode&); |
| |
| /** |
| * Returns a percentage format for the current default locale. |
| * @stable |
| */ |
| static NumberFormat* createPercentInstance(UErrorCode&); |
| |
| /** |
| * Returns a percentage format for the specified locale. |
| * @stable |
| */ |
| static NumberFormat* createPercentInstance(const Locale& inLocale, |
| UErrorCode&); |
| |
| /** |
| * Returns a scientific format for the current default locale. |
| * @stable |
| */ |
| static NumberFormat* createScientificInstance(UErrorCode&); |
| |
| /** |
| * Returns a scientific format for the specified locale. |
| * @stable |
| */ |
| static NumberFormat* createScientificInstance(const Locale& inLocale, |
| UErrorCode&); |
| |
| /** |
| * Get the set of Locales for which NumberFormats are installed. |
| * @stable |
| */ |
| static const Locale* getAvailableLocales(int32_t& count); |
| |
| /** |
| * Returns true if grouping is used in this format. For example, |
| * in the English locale, with grouping on, the number 1234567 |
| * might be formatted as "1,234,567". The grouping separator as |
| * well as the size of each group is locale dependant and is |
| * determined by sub-classes of NumberFormat. |
| * @see setGroupingUsed |
| * @stable |
| */ |
| UBool isGroupingUsed(void) const; |
| |
| /** |
| * Set whether or not grouping will be used in this format. |
| * @see getGroupingUsed |
| * @stable |
| */ |
| virtual void setGroupingUsed(UBool newValue); |
| |
| /** |
| * Returns the maximum number of digits allowed in the integer portion of a |
| * number. |
| * @see setMaximumIntegerDigits |
| * @stable |
| */ |
| int32_t getMaximumIntegerDigits(void) const; |
| |
| /** |
| * Sets the maximum number of digits allowed in the integer portion of a |
| * number. maximumIntegerDigits must be >= minimumIntegerDigits. If the |
| * new value for maximumIntegerDigits is less than the current value |
| * of minimumIntegerDigits, then minimumIntegerDigits will also be set to |
| * the new value. |
| * |
| * @see getMaximumIntegerDigits |
| * @stable |
| */ |
| virtual void setMaximumIntegerDigits(int32_t newValue); |
| |
| /** |
| * Returns the minimum number of digits allowed in the integer portion of a |
| * number. |
| * @see setMinimumIntegerDigits |
| * @stable |
| */ |
| int32_t getMinimumIntegerDigits(void) const; |
| |
| /** |
| * Sets the minimum number of digits allowed in the integer portion of a |
| * number. minimumIntegerDigits must be <= maximumIntegerDigits. If the |
| * new value for minimumIntegerDigits exceeds the current value |
| * of maximumIntegerDigits, then maximumIntegerDigits will also be set to |
| * the new value. |
| * @see getMinimumIntegerDigits |
| * @stable |
| */ |
| virtual void setMinimumIntegerDigits(int32_t newValue); |
| |
| /** |
| * Returns the maximum number of digits allowed in the fraction portion of a |
| * number. |
| * @see setMaximumFractionDigits |
| * @stable |
| */ |
| int32_t getMaximumFractionDigits(void) const; |
| |
| /** |
| * Sets the maximum number of digits allowed in the fraction portion of a |
| * number. maximumFractionDigits must be >= minimumFractionDigits. If the |
| * new value for maximumFractionDigits is less than the current value |
| * of minimumFractionDigits, then minimumFractionDigits will also be set to |
| * the new value. |
| * @see getMaximumFractionDigits |
| * @stable |
| */ |
| virtual void setMaximumFractionDigits(int32_t newValue); |
| |
| /** |
| * Returns the minimum number of digits allowed in the fraction portion of a |
| * number. |
| * @see setMinimumFractionDigits |
| * @stable |
| */ |
| int32_t getMinimumFractionDigits(void) const; |
| |
| /** |
| * Sets the minimum number of digits allowed in the fraction portion of a |
| * number. minimumFractionDigits must be <= maximumFractionDigits. If the |
| * new value for minimumFractionDigits exceeds the current value |
| * of maximumFractionDigits, then maximumIntegerDigits will also be set to |
| * the new value |
| * @see getMinimumFractionDigits |
| * @stable |
| */ |
| virtual void setMinimumFractionDigits(int32_t newValue); |
| |
| 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. |
| * @stable |
| */ |
| static UClassID getStaticClassID(void) { return (UClassID)&fgClassID; } |
| |
| /** |
| * Override Calendar |
| * 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. |
| * <P> |
| * @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 |
| */ |
| virtual UClassID getDynamicClassID(void) const { return getStaticClassID(); } |
| |
| protected: |
| |
| /** |
| * Default constructor for subclass use only. |
| * @stable |
| */ |
| NumberFormat(); |
| |
| /** |
| * Copy constructor. |
| * @stable |
| */ |
| NumberFormat(const NumberFormat&); |
| |
| /** |
| * Assignment operator. |
| * @stable |
| */ |
| NumberFormat& operator=(const NumberFormat&); |
| |
| protected: |
| static const int32_t fgMaxIntegerDigits; |
| static const int32_t fgMinIntegerDigits; |
| |
| private: |
| static char fgClassID; |
| |
| enum EStyles { |
| kNumberStyle, |
| kCurrencyStyle, |
| kPercentStyle, |
| kScientificStyle, |
| kStyleCount // ALWAYS LAST ENUM: number of styles |
| }; |
| |
| static NumberFormat* createInstance(const Locale& desiredLocale, EStyles choice, UErrorCode& success); |
| |
| static const int32_t fgNumberPatternsCount; |
| static const UnicodeString fgLastResortNumberPatterns[]; |
| |
| UBool fGroupingUsed; |
| int32_t fMaxIntegerDigits; |
| int32_t fMinIntegerDigits; |
| int32_t fMaxFractionDigits; |
| int32_t fMinFractionDigits; |
| UBool fParseIntegerOnly; |
| }; |
| |
| // ------------------------------------- |
| |
| inline UBool |
| NumberFormat::isParseIntegerOnly() const |
| { |
| return fParseIntegerOnly; |
| } |
| |
| inline UnicodeString& |
| NumberFormat::format(const Formattable& obj, |
| UnicodeString& result, |
| UErrorCode& status) const { |
| return Format::format(obj, result, status); |
| } |
| |
| #endif // _NUMFMT |
| //eof |
