diff options
Diffstat (limited to 'intl/icu/source/i18n/unicode/choicfmt.h')
| -rw-r--r-- | intl/icu/source/i18n/unicode/choicfmt.h | 601 |
1 files changed, 601 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/unicode/choicfmt.h b/intl/icu/source/i18n/unicode/choicfmt.h new file mode 100644 index 0000000000..3b2f48cb1f --- /dev/null +++ b/intl/icu/source/i18n/unicode/choicfmt.h @@ -0,0 +1,601 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************** +* Copyright (C) 1997-2013, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************** +* +* File CHOICFMT.H +* +* Modification History: +* +* Date Name Description +* 02/19/97 aliu Converted from java. +* 03/20/97 helena Finished first cut of implementation and got rid +* of nextDouble/previousDouble and replaced with +* boolean array. +* 4/10/97 aliu Clean up. Modified to work on AIX. +* 8/6/97 nos Removed overloaded constructor, member var 'buffer'. +* 07/22/98 stephen Removed operator!= (implemented in Format) +******************************************************************************** +*/ + +#ifndef CHOICFMT_H +#define CHOICFMT_H + +#include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + +/** + * \file + * \brief C++ API: Choice Format. + */ + +#if !UCONFIG_NO_FORMATTING + +#include "unicode/fieldpos.h" +#include "unicode/format.h" +#include "unicode/messagepattern.h" +#include "unicode/numfmt.h" +#include "unicode/unistr.h" + +#ifndef U_HIDE_DEPRECATED_API + +U_NAMESPACE_BEGIN + +class MessageFormat; + +/** + * ChoiceFormat converts between ranges of numeric values and strings for those ranges. + * The strings must conform to the MessageFormat pattern syntax. + * + * <p><em><code>ChoiceFormat</code> is probably not what you need. + * Please use <code>MessageFormat</code> + * with <code>plural</code> arguments for proper plural selection, + * and <code>select</code> arguments for simple selection among a fixed set of choices!</em></p> + * + * <p>A <code>ChoiceFormat</code> splits + * the real number line \htmlonly<code>-∞</code> to + * <code>+∞</code>\endhtmlonly into two + * or more contiguous ranges. Each range is mapped to a + * string.</p> + * + * <p><code>ChoiceFormat</code> was originally intended + * for displaying grammatically correct + * plurals such as "There is one file." vs. "There are 2 files." + * <em>However,</em> plural rules for many languages + * are too complex for the capabilities of ChoiceFormat, + * and its requirement of specifying the precise rules for each message + * is unmanageable for translators.</p> + * + * <p>There are two methods of defining a <code>ChoiceFormat</code>; both + * are equivalent. The first is by using a string pattern. This is the + * preferred method in most cases. The second method is through direct + * specification of the arrays that logically make up the + * <code>ChoiceFormat</code>.</p> + * + * <p>Note: Typically, choice formatting is done (if done at all) via <code>MessageFormat</code> + * with a <code>choice</code> argument type, + * rather than using a stand-alone <code>ChoiceFormat</code>.</p> + * + * <h5>Patterns and Their Interpretation</h5> + * + * <p>The pattern string defines the range boundaries and the strings for each number range. + * Syntax: + * <pre> + * choiceStyle = number separator message ('|' number separator message)* + * number = normal_number | ['-'] \htmlonly∞\endhtmlonly (U+221E, infinity) + * normal_number = double value (unlocalized ASCII string) + * separator = less_than | less_than_or_equal + * less_than = '<' + * less_than_or_equal = '#' | \htmlonly≤\endhtmlonly (U+2264) + * message: see {@link MessageFormat} + * </pre> + * Pattern_White_Space between syntax elements is ignored, except + * around each range's sub-message.</p> + * + * <p>Each numeric sub-range extends from the current range's number + * to the next range's number. + * The number itself is included in its range if a <code>less_than_or_equal</code> sign is used, + * and excluded from its range (and instead included in the previous range) + * if a <code>less_than</code> sign is used.</p> + * + * <p>When a <code>ChoiceFormat</code> is constructed from + * arrays of numbers, closure flags and strings, + * they are interpreted just like + * the sequence of <code>(number separator string)</code> in an equivalent pattern string. + * <code>closure[i]==TRUE</code> corresponds to a <code>less_than</code> separator sign. + * The equivalent pattern string will be constructed automatically.</p> + * + * <p>During formatting, a number is mapped to the first range + * where the number is not greater than the range's upper limit. + * That range's message string is returned. A NaN maps to the very first range.</p> + * + * <p>During parsing, a range is selected for the longest match of + * any range's message. That range's number is returned, ignoring the separator/closure. + * Only a simple string match is performed, without parsing of arguments that + * might be specified in the message strings.</p> + * + * <p>Note that the first range's number is ignored in formatting + * but may be returned from parsing.</p> + * + * <h5>Examples</h5> + * + * <p>Here is an example of two arrays that map the number + * <code>1..7</code> to the English day of the week abbreviations + * <code>Sun..Sat</code>. No closures array is given; this is the same as + * specifying all closures to be <code>FALSE</code>.</p> + * + * <pre> {1,2,3,4,5,6,7}, + * {"Sun","Mon","Tue","Wed","Thur","Fri","Sat"}</pre> + * + * <p>Here is an example that maps the ranges [-Inf, 1), [1, 1], and (1, + * +Inf] to three strings. That is, the number line is split into three + * ranges: x < 1.0, x = 1.0, and x > 1.0. + * (The round parentheses in the notation above indicate an exclusive boundary, + * like the turned bracket in European notation: [-Inf, 1) == [-Inf, 1[ )</p> + * + * <pre> {0, 1, 1}, + * {FALSE, FALSE, TRUE}, + * {"no files", "one file", "many files"}</pre> + * + * <p>Here is an example that shows formatting and parsing: </p> + * + * \code + * #include <unicode/choicfmt.h> + * #include <unicode/unistr.h> + * #include <iostream.h> + * + * int main(int argc, char *argv[]) { + * double limits[] = {1,2,3,4,5,6,7}; + * UnicodeString monthNames[] = { + * "Sun","Mon","Tue","Wed","Thu","Fri","Sat"}; + * ChoiceFormat fmt(limits, monthNames, 7); + * UnicodeString str; + * char buf[256]; + * for (double x = 1.0; x <= 8.0; x += 1.0) { + * fmt.format(x, str); + * str.extract(0, str.length(), buf, 256, ""); + * str.truncate(0); + * cout << x << " -> " + * << buf << endl; + * } + * cout << endl; + * return 0; + * } + * \endcode + * + * <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. + * + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ +class U_I18N_API ChoiceFormat: public NumberFormat { +public: + /** + * Constructs a new ChoiceFormat from the pattern string. + * + * @param pattern Pattern used to construct object. + * @param status Output param to receive success code. If the + * pattern cannot be parsed, set to failure code. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + ChoiceFormat(const UnicodeString& pattern, + UErrorCode& status); + + + /** + * Constructs a new ChoiceFormat with the given limits and message strings. + * All closure flags default to <code>FALSE</code>, + * equivalent to <code>less_than_or_equal</code> separators. + * + * Copies the limits and formats instead of adopting them. + * + * @param limits Array of limit values. + * @param formats Array of formats. + * @param count Size of 'limits' and 'formats' arrays. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + ChoiceFormat(const double* limits, + const UnicodeString* formats, + int32_t count ); + + /** + * Constructs a new ChoiceFormat with the given limits, closure flags and message strings. + * + * Copies the limits and formats instead of adopting them. + * + * @param limits Array of limit values + * @param closures Array of booleans specifying whether each + * element of 'limits' is open or closed. If FALSE, then the + * corresponding limit number is a member of its range. + * If TRUE, then the limit number belongs to the previous range it. + * @param formats Array of formats + * @param count Size of 'limits', 'closures', and 'formats' arrays + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + ChoiceFormat(const double* limits, + const UBool* closures, + const UnicodeString* formats, + int32_t count); + + /** + * Copy constructor. + * + * @param that ChoiceFormat object to be copied from + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + ChoiceFormat(const ChoiceFormat& that); + + /** + * Assignment operator. + * + * @param that ChoiceFormat object to be copied + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + const ChoiceFormat& operator=(const ChoiceFormat& that); + + /** + * Destructor. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual ~ChoiceFormat(); + + /** + * Clones this Format object. The caller owns the + * result and must delete it when done. + * + * @return a copy of this object + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual ChoiceFormat* clone() const; + + /** + * Returns true if the given Format objects are semantically equal. + * Objects of different subclasses are considered unequal. + * + * @param other ChoiceFormat object to be compared + * @return true if other is the same as this. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UBool operator==(const Format& other) const; + + /** + * 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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual void applyPattern(const UnicodeString& pattern, + UErrorCode& status); + + /** + * Sets the 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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual void applyPattern(const UnicodeString& pattern, + UParseError& parseError, + UErrorCode& status); + /** + * Gets the pattern. + * + * @param pattern Output param which will receive the pattern + * Previous contents are deleted. + * @return A reference to 'pattern' + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UnicodeString& toPattern(UnicodeString &pattern) const; + + /** + * Sets the choices to be used in formatting. + * For details see the constructor with the same parameter list. + * + * @param limitsToCopy Contains the top value that you want + * parsed with that format,and should be in + * ascending sorted order. When formatting X, + * the choice will be the i, where limit[i] + * <= X < limit[i+1]. + * @param formatsToCopy The format strings you want to use for each limit. + * @param count The size of the above arrays. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual void setChoices(const double* limitsToCopy, + const UnicodeString* formatsToCopy, + int32_t count ); + + /** + * Sets the choices to be used in formatting. + * For details see the constructor with the same parameter list. + * + * @param limits Array of limits + * @param closures Array of limit booleans + * @param formats Array of format string + * @param count The size of the above arrays + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual void setChoices(const double* limits, + const UBool* closures, + const UnicodeString* formats, + int32_t count); + + /** + * Returns NULL and 0. + * Before ICU 4.8, this used to return the choice limits array. + * + * @param count Will be set to 0. + * @return NULL + * @deprecated ICU 4.8 Use the MessagePattern class to analyze a ChoiceFormat pattern. + */ + virtual const double* getLimits(int32_t& count) const; + + /** + * Returns NULL and 0. + * Before ICU 4.8, this used to return the limit booleans array. + * + * @param count Will be set to 0. + * @return NULL + * @deprecated ICU 4.8 Use the MessagePattern class to analyze a ChoiceFormat pattern. + */ + virtual const UBool* getClosures(int32_t& count) const; + + /** + * Returns NULL and 0. + * Before ICU 4.8, this used to return the array of choice strings. + * + * @param count Will be set to 0. + * @return NULL + * @deprecated ICU 4.8 Use the MessagePattern class to analyze a ChoiceFormat pattern. + */ + virtual const UnicodeString* getFormats(int32_t& count) const; + + + using NumberFormat::format; + + /** + * Formats a double number using this object's choices. + * + * @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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UnicodeString& format(double number, + UnicodeString& appendTo, + FieldPosition& pos) const; + /** + * Formats an int32_t number using this object's choices. + * + * @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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UnicodeString& format(int32_t number, + UnicodeString& appendTo, + FieldPosition& pos) const; + + /** + * Formats an int64_t number using this object's choices. + * + * @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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UnicodeString& format(int64_t number, + UnicodeString& appendTo, + FieldPosition& pos) const; + + /** + * Formats an array of objects using this object's choices. + * + * @param objs The array of objects to be formatted. + * @param cnt The size of objs. + * @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 success Output param set to success/failure code on + * exit. + * @return Reference to 'appendTo' parameter. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UnicodeString& format(const Formattable* objs, + int32_t cnt, + UnicodeString& appendTo, + FieldPosition& pos, + UErrorCode& success) const; + + using NumberFormat::parse; + + /** + * Looks for the longest match of any message string on the input text and, + * if there is a match, sets the result object to the corresponding range's number. + * + * If no string matches, then the parsePosition is unchanged. + * + * @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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual void parse(const UnicodeString& text, + Formattable& result, + ParsePosition& parsePosition) const; + + /** + * Returns a unique class ID POLYMORPHICALLY. Part of ICU's "poor man's RTTI". + * + * @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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + virtual UClassID getDynamicClassID(void) const; + + /** + * Returns 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. + * @deprecated ICU 49 Use MessageFormat instead, with plural and select arguments. + */ + static UClassID U_EXPORT2 getStaticClassID(void); + +private: + /** + * Converts a double value to a string. + * @param value the double number to be converted. + * @param string the result string. + * @return the converted string. + */ + static UnicodeString& dtos(double value, UnicodeString& string); + + ChoiceFormat(); // default constructor not implemented + + /** + * Construct a new ChoiceFormat with the limits and the corresponding formats + * based on the pattern. + * + * @param newPattern Pattern used to construct object. + * @param parseError Struct to receive information on position + * of error if an error is encountered. + * @param status Output param to receive success code. If the + * pattern cannot be parsed, set to failure code. + */ + ChoiceFormat(const UnicodeString& newPattern, + UParseError& parseError, + UErrorCode& status); + + friend class MessageFormat; + + virtual void setChoices(const double* limits, + const UBool* closures, + const UnicodeString* formats, + int32_t count, + UErrorCode &errorCode); + + /** + * Finds the ChoiceFormat sub-message for the given number. + * @param pattern A MessagePattern. + * @param partIndex the index of the first ChoiceFormat argument style part. + * @param number a number to be mapped to one of the ChoiceFormat argument's intervals + * @return the sub-message start part index. + */ + static int32_t findSubMessage(const MessagePattern &pattern, int32_t partIndex, double number); + + static double parseArgument( + const MessagePattern &pattern, int32_t partIndex, + const UnicodeString &source, ParsePosition &pos); + + /** + * Matches the pattern string from the end of the partIndex to + * the beginning of the limitPartIndex, + * including all syntax except SKIP_SYNTAX, + * against the source string starting at sourceOffset. + * If they match, returns the length of the source string match. + * Otherwise returns -1. + */ + static int32_t matchStringUntilLimitPart( + const MessagePattern &pattern, int32_t partIndex, int32_t limitPartIndex, + const UnicodeString &source, int32_t sourceOffset); + + /** + * Some of the ChoiceFormat constructors do not have a UErrorCode paramater. + * We need _some_ way to provide one for the MessagePattern constructor. + * Alternatively, the MessagePattern could be a pointer field, but that is + * not nice either. + */ + UErrorCode constructorErrorCode; + + /** + * The MessagePattern which contains the parsed structure of the pattern string. + * + * Starting with ICU 4.8, the MessagePattern contains a sequence of + * numeric/selector/message parts corresponding to the parsed pattern. + * For details see the MessagePattern class API docs. + */ + MessagePattern msgPattern; + + /** + * Docs & fields from before ICU 4.8, before MessagePattern was used. + * Commented out, and left only for explanation of semantics. + * -------- + * Each ChoiceFormat divides the range -Inf..+Inf into fCount + * intervals. The intervals are: + * + * 0: fChoiceLimits[0]..fChoiceLimits[1] + * 1: fChoiceLimits[1]..fChoiceLimits[2] + * ... + * fCount-2: fChoiceLimits[fCount-2]..fChoiceLimits[fCount-1] + * fCount-1: fChoiceLimits[fCount-1]..+Inf + * + * Interval 0 is special; during formatting (mapping numbers to + * strings), it also contains all numbers less than + * fChoiceLimits[0], as well as NaN values. + * + * Interval i maps to and from string fChoiceFormats[i]. When + * parsing (mapping strings to numbers), then intervals map to + * their lower limit, that is, interval i maps to fChoiceLimit[i]. + * + * The intervals may be closed, half open, or open. This affects + * formatting but does not affect parsing. Interval i is affected + * by fClosures[i] and fClosures[i+1]. If fClosures[i] + * is FALSE, then the value fChoiceLimits[i] is in interval i. + * That is, intervals i and i are: + * + * i-1: ... x < fChoiceLimits[i] + * i: fChoiceLimits[i] <= x ... + * + * If fClosures[i] is TRUE, then the value fChoiceLimits[i] is + * in interval i-1. That is, intervals i-1 and i are: + * + * i-1: ... x <= fChoiceLimits[i] + * i: fChoiceLimits[i] < x ... + * + * Because of the nature of interval 0, fClosures[0] has no + * effect. + */ + // double* fChoiceLimits; + // UBool* fClosures; + // UnicodeString* fChoiceFormats; + // int32_t fCount; +}; + + +U_NAMESPACE_END + +#endif // U_HIDE_DEPRECATED_API +#endif /* #if !UCONFIG_NO_FORMATTING */ + +#endif /* U_SHOW_CPLUSPLUS_API */ + +#endif // CHOICFMT_H +//eof |