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