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| // © 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) | |
| ******************************************************************************** | |
| */ | |
| /** | |
| * \file | |
| * \brief C++ API: Choice Format. | |
| */ | |
| 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 override; | |
| /** | |
| * 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 bool operator==(const Format& other) const override; | |
| /** | |
| * 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 nullptr and 0. | |
| * Before ICU 4.8, this used to return the choice limits array. | |
| * | |
| * @param count Will be set to 0. | |
| * @return nullptr | |
| * @deprecated ICU 4.8 Use the MessagePattern class to analyze a ChoiceFormat pattern. | |
| */ | |
| virtual const double* getLimits(int32_t& count) const; | |
| /** | |
| * Returns nullptr and 0. | |
| * Before ICU 4.8, this used to return the limit booleans array. | |
| * | |
| * @param count Will be set to 0. | |
| * @return nullptr | |
| * @deprecated ICU 4.8 Use the MessagePattern class to analyze a ChoiceFormat pattern. | |
| */ | |
| virtual const UBool* getClosures(int32_t& count) const; | |
| /** | |
| * Returns nullptr and 0. | |
| * Before ICU 4.8, this used to return the array of choice strings. | |
| * | |
| * @param count Will be set to 0. | |
| * @return nullptr | |
| * @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 override; | |
| /** | |
| * 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 override; | |
| /** | |
| * 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 override; | |
| /** | |
| * 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 override; | |
| /** | |
| * 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 override; | |
| /** | |
| * 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() = delete; // 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 parameter. | |
| * 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 | |
| //eof | |