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Unified Diff: icu46/source/i18n/unicode/msgfmt.h

Issue 5516007: Check in the pristine copy of ICU 4.6... (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/
Patch Set: Created 10 years ago
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Index: icu46/source/i18n/unicode/msgfmt.h
===================================================================
--- icu46/source/i18n/unicode/msgfmt.h (revision 0)
+++ icu46/source/i18n/unicode/msgfmt.h (revision 0)
@@ -0,0 +1,961 @@
+/*
+* Copyright (C) 2007-2010, International Business Machines Corporation and
+* others. All Rights Reserved.
+********************************************************************************
+*
+* File MSGFMT.H
+*
+* Modification History:
+*
+* Date Name Description
+* 02/19/97 aliu Converted from java.
+* 03/20/97 helena Finished first cut of implementation.
+* 07/22/98 stephen Removed operator!= (defined in Format)
+* 08/19/2002 srl Removing Javaisms
+*******************************************************************************/
+
+#ifndef MSGFMT_H
+#define MSGFMT_H
+
+#include "unicode/utypes.h"
+
+/**
+ * \file
+ * \brief C++ API: Formats messages in a language-neutral way.
+ */
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/format.h"
+#include "unicode/locid.h"
+#include "unicode/parseerr.h"
+#include "unicode/uchar.h"
+
+U_NAMESPACE_BEGIN
+
+class NumberFormat;
+class DateFormat;
+
+/**
+ *
+ * MessageFormat produces concatenated messages in a language-neutral
+ * way. Use this whenever concatenating strings that are displayed to
+ * end users.
+ *
+ * <P>A MessageFormat contains an array of <EM>subformats</EM> arranged
+ * within a <EM>template string</EM>. Together, the subformats and
+ * template string determine how the MessageFormat will operate during
+ * formatting and parsing.
+ *
+ * <P>Typically, both the subformats and the template string are
+ * specified at once in a <EM>pattern</EM>. By using different
+ * patterns for different locales, messages may be localized.
+ *
+ * <P>When formatting, MessageFormat takes an array of arguments
+ * and produces a user-readable string. Each argument is a
+ * Formattable object; they may be passed in in an array, or as a
+ * single Formattable object which itself contains an array. Each
+ * argument is matched up with its corresponding subformat, which then
+ * formats it into a string. The resulting strings are then assembled
+ * within the string template of the MessageFormat to produce the
+ * final output string.
+ *
+ * <p><strong>Note:</strong>
+ * In ICU 4.0 MessageFormat supports named arguments. If a named argument
+ * is used, all arguments must be named. Names start with a character in
+ * <code>UCHAR_ID_START</code> and continue with characters in
+ * <code>UCHARID_CONTINUE</code>, in particular they do not start with a digit.
+ * If named arguments are used, {@link #usesNamedArguments()} will return true.
+ *
+ * <p>The other new methods supporting named arguments are
+ * {@link #getFormatNames(UErrorCode& status)},
+ * {@link #getFormat(const UnicodeString& formatName, UErrorCode& status)}
+ * {@link #setFormat(const UnicodeString& formatName, const Format& format, UErrorCode& status)},
+ * {@link #adoptFormat(const UnicodeString& formatName, Format* formatToAdopt, UErrorCode& status)},
+ * {@link #format(const UnicodeString* argumentNames, const Formattable* arguments,
+ * int32_t count, UnicodeString& appendTo,UErrorCode& status)}.
+ * These methods are all compatible with patterns that do not used named arguments--
+ * in these cases the keys in the input or output use <code>UnicodeString</code>s
+ * that name the argument indices, e.g. "0", "1", "2"... etc.
+ *
+ * <p>If this format uses named arguments, certain methods that take or
+ * return arrays do not perform any action, since it is not possible to
+ * identify positions in an array using a name. Of these methods,
+ * UErrorCode is set to U_ILLEGAL_ARGUMENT_ERROR by format, and to
+ * U_ARGUMENT_TYPE_MISMATCH by parse.
+ * These methods are
+ * {@link #adoptFormats(Format** formatsToAdopt, int32_t count)},
+ * {@link #setFormats(const Format** newFormats,int32_t count)},
+ * {@link #adoptFormat(int32_t n, Format *newFormat)},
+ * {@link #setFormat(int32_t n, Format& newFormat)},
+ * {@link #format(const Formattable* source, int32_t count, UnicodeString& appendTo, FieldPosition& ignore, UErrorCode& success)},
+ * {@link #format(const UnicodeString& pattern,const Formattable* arguments,int32_t cnt,UnicodeString& appendTo,UErrorCode& success)},
+ * {@link #format(const Formattable& source, UnicodeString& appendTo, FieldPosition& ignore, UErrorCode& success)},
+ * {@link #format(const Formattable* arguments, int32_t cnt, UnicodeString& appendTo, FieldPosition& status, int32_t recursionProtection,UErrorCode& success)},
+ * {@link #parse(const UnicodeString& source, ParsePosition& pos, int32_t& count)},
+ * {@link #parse(const UnicodeString& source, int32_t& cnt, UErrorCode& status)}
+ *
+ * <P>
+ * During parsing, an input string is matched against the string
+ * template of the MessageFormat to produce an array of Formattable
+ * objects. Plain text of the template string is matched directly
+ * against input text. At each position in the template string where
+ * a subformat is located, the subformat is called to parse the
+ * corresponding segment of input text to produce an output argument.
+ * In this way, an array of arguments is created which together
+ * constitute the parse result.
+ * <P>
+ * Parsing may fail or produce unexpected results in a number of
+ * circumstances.
+ * <UL>
+ * <LI>If one of the arguments does not occur in the pattern, it
+ * will be returned as a default Formattable.
+ * <LI>If the format of an argument loses information, such as with
+ * a choice format where a large number formats to "many", then the
+ * parse may not correspond to the originally formatted argument.
+ * <LI>MessageFormat does not handle ChoiceFormat recursion during
+ * parsing; such parses will fail.
+ * <LI>Parsing will not always find a match (or the correct match) if
+ * some part of the parse is ambiguous. For example, if the pattern
+ * "{1},{2}" is used with the string arguments {"a,b", "c"}, it will
+ * format as "a,b,c". When the result is parsed, it will return {"a",
+ * "b,c"}.
+ * <LI>If a single argument is formatted more than once in the string,
+ * then the rightmost subformat in the pattern string will produce the
+ * parse result; prior subformats with the same argument index will
+ * have no effect.
+ * </UL>
+ * Here are some examples of usage:
+ * <P>
+ * Example 1:
+ * <pre>
+ * \code
+ * UErrorCode success = U_ZERO_ERROR;
+ * GregorianCalendar cal(success);
+ * Formattable arguments[] = {
+ * 7L,
+ * Formattable( (Date) cal.getTime(success), Formattable::kIsDate),
+ * "a disturbance in the Force"
+ * };
+ *
+ * UnicodeString result;
+ * MessageFormat::format(
+ * "At {1,time} on {1,date}, there was {2} on planet {0,number}.",
+ * arguments, 3, result, success );
+ *
+ * cout << "result: " << result << endl;
+ * //<output>: At 4:34:20 PM on 23-Mar-98, there was a disturbance
+ * // in the Force on planet 7.
+ * \endcode
+ * </pre>
+ * Typically, the message format will come from resources, and the
+ * arguments will be dynamically set at runtime.
+ * <P>
+ * Example 2:
+ * <pre>
+ * \code
+ * success = U_ZERO_ERROR;
+ * Formattable testArgs[] = {3L, "MyDisk"};
+ *
+ * MessageFormat form(
+ * "The disk \"{1}\" contains {0} file(s).", success );
+ *
+ * UnicodeString string;
+ * FieldPosition fpos = 0;
+ * cout << "format: " << form.format(testArgs, 2, string, fpos, success ) << endl;
+ *
+ * // output, with different testArgs:
+ * // output: The disk "MyDisk" contains 0 file(s).
+ * // output: The disk "MyDisk" contains 1 file(s).
+ * // output: The disk "MyDisk" contains 1,273 file(s).
+ * \endcode
+ * </pre>
+ *
+ * The pattern is of the following form. Legend:
+ * <pre>
+ * \code
+ * {optional item}
+ * (group that may be repeated)*
+ * \endcode
+ * </pre>
+ * Do not confuse optional items with items inside quoted braces, such
+ * as this: "{". Quoted braces are literals.
+ * <pre>
+ * \code
+ * messageFormatPattern := string ( "{" messageFormatElement "}" string )*
+ *
+ * messageFormatElement := argumentIndex | argumentName { "," elementFormat }
+ *
+ * elementFormat := "time" { "," datetimeStyle }
+ * | "date" { "," datetimeStyle }
+ * | "number" { "," numberStyle }
+ * | "choice" "," choiceStyle
+ * | "spellout" { "," spelloutStyle }
+ * | "ordinal" { "," spelloutStyle }
+ * | "duration" { "," spelloutStyle }
+ * | "plural" "," pluralStyle
+ * | "select" "," selectStyle
+ *
+ * datetimeStyle := "short"
+ * | "medium"
+ * | "long"
+ * | "full"
+ * | dateFormatPattern
+ *
+ * numberStyle := "currency"
+ * | "percent"
+ * | "integer"
+ * | numberFormatPattern
+ *
+ * choiceStyle := choiceFormatPattern
+ *
+ * pluralStyle := pluralFormatPattern
+ *
+ * selectStyle := selectFormatPattern
+ *
+ * spelloutStyle := ruleSetName
+ * \endcode
+ * </pre>
+ * If there is no elementFormat, then the argument must be a string,
+ * which is substituted. If there is no dateTimeStyle or numberStyle,
+ * then the default format is used (e.g. NumberFormat::createInstance(),
+ * DateFormat::createTimeInstance(DateFormat::kDefault, ...) or
+ * DateFormat::createDateInstance(DateFormat::kDefault, ...). For
+ * a RuleBasedNumberFormat, if there is no ruleSetName, the default
+ * rule set is used. For a ChoiceFormat or PluralFormat or SelectFormat, the pattern
+ * must always be specified, since there is no default.
+ * <P>
+ * In strings, single quotes can be used to quote syntax characters.
+ * A literal single quote is represented by '', both within and outside
+ * of single-quoted segments. Inside a
+ * messageFormatElement, quotes are <EM>not</EM> removed. For example,
+ * {1,number,$'#',##} will produce a number format with the pound-sign
+ * quoted, with a result such as: "$#31,45".
+ * <P>
+ * If a pattern is used, then unquoted braces in the pattern, if any,
+ * must match: that is, "ab {0} de" and "ab '}' de" are ok, but "ab
+ * {0'}' de" and "ab } de" are not.
+ * <p>
+ * <dl><dt><b>Warning:</b><dd>The rules for using quotes within message
+ * format patterns unfortunately have shown to be somewhat confusing.
+ * In particular, it isn't always obvious to localizers whether single
+ * quotes need to be doubled or not. Make sure to inform localizers about
+ * the rules, and tell them (for example, by using comments in resource
+ * bundle source files) which strings will be processed by MessageFormat.
+ * Note that localizers may need to use single quotes in translated
+ * strings where the original version doesn't have them.
+ * <br>Note also that the simplest way to avoid the problem is to
+ * use the real apostrophe (single quote) character U+2019 (') for
+ * human-readable text, and to use the ASCII apostrophe (U+0027 ' )
+ * only in program syntax, like quoting in MessageFormat.
+ * See the annotations for U+0027 Apostrophe in The Unicode Standard.</p>
+ * </dl>
+ * <P>
+ * The argumentIndex is a non-negative integer, which corresponds to the
+ * index of the arguments presented in an array to be formatted. The
+ * first argument has argumentIndex 0.
+ * <P>
+ * It is acceptable to have unused arguments in the array. With missing
+ * arguments, or arguments that are not of the right class for the
+ * specified format, a failing UErrorCode result is set.
+ * <P>
+ * <strong>Creating internationalized messages that include plural forms, you
+ * can use a PluralFormat:</strong>
+ * <pre>
+ * \code
+ * UErrorCode err = U_ZERO_ERROR;
+ * UnicodeString t1("{0, plural, one{C''est # fichier} other{Ce sont # fichiers}} dans la liste.");
+ * MessageFormat* msgFmt = new MessageFormat(t1, Locale("fr"), err);
+ * if (U_FAILURE(err)) {
+ * return err;
+ * }
+ *
+ * Formattable args1[] = {(int32_t)0};
+ * Formattable args2[] = {(int32_t)3};
+ * FieldPosition ignore(FieldPosition::DONT_CARE);
+ * UnicodeString result;
+ * msgFmt->format(args1, 1, result, ignore, status);
+ * cout << result << endl;
+ * result.remove();
+ * msgFmt->format(args2, 1, result, ignore, status);
+ * cout << result << endl;
+ *
+ * // output, with different args
+ * // output: C'est 0,0 fichier dans la liste.
+ * // output: Ce sont 3 fichiers dans la liste."
+ * \endcode
+ * </pre>
+ * Please check PluralFormat and PluralRules for details.
+ * </P>
+ */
+class U_I18N_API MessageFormat : public Format {
+public:
+ /**
+ * Enum type for kMaxFormat.
+ * @obsolete ICU 3.0. The 10-argument limit was removed as of ICU 2.6,
+ * rendering this enum type obsolete.
+ */
+ enum EFormatNumber {
+ /**
+ * The maximum number of arguments.
+ * @obsolete ICU 3.0. The 10-argument limit was removed as of ICU 2.6,
+ * rendering this constant obsolete.
+ */
+ kMaxFormat = 10
+ };
+
+ /**
+ * Constructs a new MessageFormat using the given pattern and the
+ * default locale.
+ *
+ * @param pattern Pattern used to construct object.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @stable ICU 2.0
+ */
+ MessageFormat(const UnicodeString& pattern,
+ UErrorCode &status);
+
+ /**
+ * Constructs a new MessageFormat using the given pattern and locale.
+ * @param pattern Pattern used to construct object.
+ * @param newLocale The locale to use for formatting dates and numbers.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @stable ICU 2.0
+ */
+ MessageFormat(const UnicodeString& pattern,
+ const Locale& newLocale,
+ UErrorCode& status);
+ /**
+ * Constructs a new MessageFormat using the given pattern and locale.
+ * @param pattern Pattern used to construct object.
+ * @param newLocale The locale to use for formatting dates and numbers.
+ * @param parseError Struct to recieve information on position
+ * of error within the pattern.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @stable ICU 2.0
+ */
+ MessageFormat(const UnicodeString& pattern,
+ const Locale& newLocale,
+ UParseError& parseError,
+ UErrorCode& status);
+ /**
+ * Constructs a new MessageFormat from an existing one.
+ * @stable ICU 2.0
+ */
+ MessageFormat(const MessageFormat&);
+
+ /**
+ * Assignment operator.
+ * @stable ICU 2.0
+ */
+ const MessageFormat& operator=(const MessageFormat&);
+
+ /**
+ * Destructor.
+ * @stable ICU 2.0
+ */
+ virtual ~MessageFormat();
+
+ /**
+ * Clones this Format object polymorphically. The caller owns the
+ * result and should delete it when done.
+ * @stable ICU 2.0
+ */
+ virtual Format* clone(void) const;
+
+ /**
+ * Returns true if the given Format objects are semantically equal.
+ * Objects of different subclasses are considered unequal.
+ * @param other the object to be compared with.
+ * @return true if the given Format objects are semantically equal.
+ * @stable ICU 2.0
+ */
+ virtual UBool operator==(const Format& other) const;
+
+ /**
+ * Sets the locale. This locale is used for fetching default number or date
+ * format information.
+ * @param theLocale the new locale value to be set.
+ * @stable ICU 2.0
+ */
+ virtual void setLocale(const Locale& theLocale);
+
+ /**
+ * Gets the locale. This locale is used for fetching default number or date
+ * format information.
+ * @return the locale of the object.
+ * @stable ICU 2.0
+ */
+ virtual const Locale& getLocale(void) const;
+
+ /**
+ * Applies the given pattern string to this message format.
+ *
+ * @param pattern The pattern to be applied.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @stable ICU 2.0
+ */
+ virtual void applyPattern(const UnicodeString& pattern,
+ UErrorCode& status);
+ /**
+ * Applies the given pattern string to this message format.
+ *
+ * @param pattern The pattern to be applied.
+ * @param parseError Struct to recieve information on position
+ * of error within pattern.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @stable ICU 2.0
+ */
+ virtual void applyPattern(const UnicodeString& pattern,
+ UParseError& parseError,
+ UErrorCode& status);
+
+ /**
+ * Returns a pattern that can be used to recreate this object.
+ *
+ * @param appendTo Output parameter to receive the pattern.
+ * Result is appended to existing contents.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 2.0
+ */
+ virtual UnicodeString& toPattern(UnicodeString& appendTo) const;
+
+ /**
+ * Sets subformats.
+ * See the class description about format numbering.
+ * The caller should not delete the Format objects after this call.
+ * <EM>The array formatsToAdopt is not itself adopted.</EM> Its
+ * ownership is retained by the caller. If the call fails because
+ * memory cannot be allocated, then the formats will be deleted
+ * by this method, and this object will remain unchanged.
+ *
+ * <p>If this format uses named arguments, the new formats are discarded
+ * and this format remains unchanged.
+ *
+ * @stable ICU 2.0
+ * @param formatsToAdopt the format to be adopted.
+ * @param count the size of the array.
+ */
+ virtual void adoptFormats(Format** formatsToAdopt, int32_t count);
+
+ /**
+ * Sets subformats.
+ * See the class description about format numbering.
+ * Each item in the array is cloned into the internal array.
+ * If the call fails because memory cannot be allocated, then this
+ * object will remain unchanged.
+ *
+ * <p>If this format uses named arguments, the new formats are discarded
+ * and this format remains unchanged.
+ *
+ * @stable ICU 2.0
+ * @param newFormats the new format to be set.
+ * @param cnt the size of the array.
+ */
+ virtual void setFormats(const Format** newFormats, int32_t cnt);
+
+
+ /**
+ * Sets one subformat.
+ * See the class description about format numbering.
+ * The caller should not delete the Format object after this call.
+ * If the number is over the number of formats already set,
+ * the item will be deleted and ignored.
+ *
+ * <p>If this format uses named arguments, the new format is discarded
+ * and this format remains unchanged.
+ *
+ * @stable ICU 2.0
+ * @param formatNumber index of the subformat.
+ * @param formatToAdopt the format to be adopted.
+ */
+ virtual void adoptFormat(int32_t formatNumber, Format* formatToAdopt);
+
+ /**
+ * Sets one subformat.
+ * See the class description about format numbering.
+ * If the number is over the number of formats already set,
+ * the item will be ignored.
+ * @param formatNumber index of the subformat.
+ * @param format the format to be set.
+ * @stable ICU 2.0
+ */
+ virtual void setFormat(int32_t formatNumber, const Format& format);
+
+ /**
+ * Gets format names. This function returns formatNames in StringEnumerations
+ * which can be used with getFormat() and setFormat() to export formattable
+ * array from current MessageFormat to another. It is caller's resposibility
+ * to delete the returned formatNames.
+ * @param status output param set to success/failure code.
+ * @stable ICU 4.0
+ */
+ virtual StringEnumeration* getFormatNames(UErrorCode& status);
+
+ /**
+ * Gets subformat pointer for given format name.
+ * This function supports both named and numbered
+ * arguments-- if numbered, the formatName is the
+ * corresponding UnicodeStrings (e.g. "0", "1", "2"...).
+ * The returned Format object should not be deleted by the caller,
+ * nor should the ponter of other object . The pointer and its
+ * contents remain valid only until the next call to any method
+ * of this class is made with this object.
+ * @param formatName the name or number specifying a format
+ * @param status output param set to success/failure code.
+ * @stable ICU 4.0
+ */
+ virtual Format* getFormat(const UnicodeString& formatName, UErrorCode& status);
+
+ /**
+ * Sets one subformat for given format name.
+ * See the class description about format name.
+ * This function supports both named and numbered
+ * arguments-- if numbered, the formatName is the
+ * corresponding UnicodeStrings (e.g. "0", "1", "2"...).
+ * If there is no matched formatName or wrong type,
+ * the item will be ignored.
+ * @param formatName Name of the subformat.
+ * @param format the format to be set.
+ * @param status output param set to success/failure code.
+ * @stable ICU 4.0
+ */
+ virtual void setFormat(const UnicodeString& formatName, const Format& format, UErrorCode& status);
+
+ /**
+ * Sets one subformat for given format name.
+ * See the class description about format name.
+ * This function supports both named and numbered
+ * arguments-- if numbered, the formatName is the
+ * corresponding UnicodeStrings (e.g. "0", "1", "2"...).
+ * If there is no matched formatName or wrong type,
+ * the item will be ignored.
+ * The caller should not delete the Format object after this call.
+ * @param formatName Name of the subformat.
+ * @param formatToAdopt Format to be adopted.
+ * @param status output param set to success/failure code.
+ * @stable ICU 4.0
+ */
+ virtual void adoptFormat(const UnicodeString& formatName, Format* formatToAdopt, UErrorCode& status);
+
+ /**
+ * Gets an array of subformats of this object. The returned array
+ * should not be deleted by the caller, nor should the pointers
+ * within the array. The array and its contents remain valid only
+ * until the next call to this format. See the class description
+ * about format numbering.
+ *
+ * @param count output parameter to receive the size of the array
+ * @return an array of count Format* objects, or NULL if out of
+ * memory. Any or all of the array elements may be NULL.
+ * @stable ICU 2.0
+ */
+ virtual const Format** getFormats(int32_t& count) const;
+
+
+ using Format::format;
+
+ /**
+ * Formats the given array of arguments into a user-readable string.
+ * Does not take ownership of the Formattable* array or its contents.
+ *
+ * <p>If this format uses named arguments, appendTo is unchanged and
+ * status is set to U_ILLEGAL_ARGUMENT_ERROR.
+ *
+ * @param source An array of objects to be formatted.
+ * @param count The number of elements of 'source'.
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param ignore Not used; inherited from base class API.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 2.0
+ */
+ UnicodeString& format(const Formattable* source,
+ int32_t count,
+ UnicodeString& appendTo,
+ FieldPosition& ignore,
+ UErrorCode& status) const;
+
+ /**
+ * Formats the given array of arguments into a user-readable string
+ * using the given pattern.
+ *
+ * <p>If this format uses named arguments, appendTo is unchanged and
+ * status is set to U_ILLEGAL_ARGUMENT_ERROR.
+ *
+ * @param pattern The pattern.
+ * @param arguments An array of objects to be formatted.
+ * @param count The number of elements of 'source'.
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 2.0
+ */
+ static UnicodeString& format(const UnicodeString& pattern,
+ const Formattable* arguments,
+ int32_t count,
+ UnicodeString& appendTo,
+ UErrorCode& status);
+
+ /**
+ * Formats the given array of arguments into a user-readable
+ * string. The array must be stored within a single Formattable
+ * object of type kArray. If the Formattable object type is not of
+ * type kArray, then returns a failing UErrorCode.
+ *
+ * <p>If this format uses named arguments, appendTo is unchanged and
+ * status is set to U_ILLEGAL_ARGUMENT_ERROR.
+ *
+ * @param obj A Formattable of type kArray containing
+ * arguments 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.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 2.0
+ */
+ virtual UnicodeString& format(const Formattable& obj,
+ UnicodeString& appendTo,
+ FieldPosition& pos,
+ UErrorCode& status) const;
+
+ /**
+ * Formats the given array of arguments into a user-readable
+ * string. The array must be stored within a single Formattable
+ * object of type kArray. If the Formattable object type is not of
+ * type kArray, then returns a failing UErrorCode.
+ *
+ * @param obj The object to format
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 2.0
+ */
+ UnicodeString& format(const Formattable& obj,
+ UnicodeString& appendTo,
+ UErrorCode& status) const;
+
+
+ /**
+ * Formats the given array of arguments into a user-defined argument name
+ * array. This function supports both named and numbered
+ * arguments-- if numbered, the formatName is the
+ * corresponding UnicodeStrings (e.g. "0", "1", "2"...).
+ *
+ * @param argumentNames argument name array
+ * @param arguments An array of objects to be formatted.
+ * @param count The number of elements of 'argumentNames' and
+ * arguments. The number of argumentNames and arguments
+ * must be the same.
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 4.0
+ */
+ UnicodeString& format(const UnicodeString* argumentNames,
+ const Formattable* arguments,
+ int32_t count,
+ UnicodeString& appendTo,
+ UErrorCode& status) const;
+ /**
+ * Parses the given string into an array of output arguments.
+ *
+ * @param source String to be parsed.
+ * @param pos On input, starting position for parse. On output,
+ * final position after parse. Unchanged if parse
+ * fails.
+ * @param count Output parameter to receive the number of arguments
+ * parsed.
+ * @return an array of parsed arguments. The caller owns both
+ * the array and its contents.
+ * @stable ICU 2.0
+ */
+ virtual Formattable* parse(const UnicodeString& source,
+ ParsePosition& pos,
+ int32_t& count) const;
+
+ /**
+ * Parses the given string into an array of output arguments.
+ *
+ * <p>If this format uses named arguments, status is set to
+ * U_ARGUMENT_TYPE_MISMATCH.
+ *
+ * @param source String to be parsed.
+ * @param count Output param to receive size of returned array.
+ * @param status Input/output error code. If the
+ * pattern cannot be parsed, set to failure code.
+ * @return an array of parsed arguments. The caller owns both
+ * the array and its contents. Returns NULL if status is not U_ZERO_ERROR.
+ *
+ * @stable ICU 2.0
+ */
+ virtual Formattable* parse(const UnicodeString& source,
+ int32_t& count,
+ UErrorCode& status) const;
+
+ /**
+ * Parses the given string into an array of output arguments
+ * stored within a single Formattable of type kArray.
+ *
+ * @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 pos On input, starting position for parse. On output,
+ * final position after parse. Unchanged if parse
+ * fails.
+ * @stable ICU 2.0
+ */
+ virtual void parseObject(const UnicodeString& source,
+ Formattable& result,
+ ParsePosition& pos) const;
+
+ /**
+ * Convert an 'apostrophe-friendly' pattern into a standard
+ * pattern. Standard patterns treat all apostrophes as
+ * quotes, which is problematic in some languages, e.g.
+ * French, where apostrophe is commonly used. This utility
+ * assumes that only an unpaired apostrophe immediately before
+ * a brace is a true quote. Other unpaired apostrophes are paired,
+ * and the resulting standard pattern string is returned.
+ *
+ * <p><b>Note</b> it is not guaranteed that the returned pattern
+ * is indeed a valid pattern. The only effect is to convert
+ * between patterns having different quoting semantics.
+ *
+ * @param pattern the 'apostrophe-friendly' patttern to convert
+ * @param status Input/output error code. If the pattern
+ * cannot be parsed, the failure code is set.
+ * @return the standard equivalent of the original pattern
+ * @stable ICU 3.4
+ */
+ static UnicodeString autoQuoteApostrophe(const UnicodeString& pattern,
+ UErrorCode& status);
+
+ /**
+ * Returns true if this MessageFormat uses named arguments,
+ * and false otherwise. See class description.
+ *
+ * @return true if named arguments are used.
+ * @stable ICU 4.0
+ */
+ UBool usesNamedArguments() const;
+
+
+ /**
+ * This API is for ICU internal use only.
+ * Please do not use it.
+ *
+ * Returns argument types count in the parsed pattern.
+ * Used to distinguish pattern "{0} d" and "d".
+ *
+ * @return The number of formattable types in the pattern
+ * @internal
+ */
+ int32_t getArgTypeCount() const;
+
+ /**
+ * Returns a unique class ID POLYMORPHICALLY. Pure virtual override.
+ * This method is to implement a simple version of RTTI, since not all
+ * C++ compilers support genuine RTTI. Polymorphic operator==() and
+ * clone() methods call this method.
+ *
+ * @return The class ID for this object. All objects of a
+ * given class have the same class ID. Objects of
+ * other classes have different class IDs.
+ * @stable ICU 2.0
+ */
+ virtual UClassID getDynamicClassID(void) const;
+
+ /**
+ * 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 ICU 2.0
+ */
+ static UClassID U_EXPORT2 getStaticClassID(void);
+
+private:
+
+ Locale fLocale;
+ UnicodeString fPattern;
+ Format** formatAliases; // see getFormats
+ int32_t formatAliasesCapacity;
+ UProperty idStart;
+ UProperty idContinue;
+
+ MessageFormat(); // default constructor not implemented
+
+ /*
+ * A structure representing one subformat of this MessageFormat.
+ * Each subformat has a Format object, an offset into the plain
+ * pattern text fPattern, and an argument number. The argument
+ * number corresponds to the array of arguments to be formatted.
+ * @internal
+ */
+ class Subformat;
+
+ /**
+ * A MessageFormat contains an array of subformats. This array
+ * needs to grow dynamically if the MessageFormat is modified.
+ */
+ Subformat* subformats;
+ int32_t subformatCount;
+ int32_t subformatCapacity;
+
+ /**
+ * A MessageFormat formats an array of arguments. Each argument
+ * has an expected type, based on the pattern. For example, if
+ * the pattern contains the subformat "{3,number,integer}", then
+ * we expect argument 3 to have type Formattable::kLong. This
+ * array needs to grow dynamically if the MessageFormat is
+ * modified.
+ */
+ Formattable::Type* argTypes;
+ int32_t argTypeCount;
+ int32_t argTypeCapacity;
+
+ /**
+ * Is true iff all argument names are non-negative numbers.
+ *
+ */
+ UBool isArgNumeric;
+
+ // Variable-size array management
+ UBool allocateSubformats(int32_t capacity);
+ UBool allocateArgTypes(int32_t capacity);
+
+ /**
+ * Default Format objects used when no format is specified and a
+ * numeric or date argument is formatted. These are volatile
+ * cache objects maintained only for performance. They do not
+ * participate in operator=(), copy constructor(), nor
+ * operator==().
+ */
+ NumberFormat* defaultNumberFormat;
+ DateFormat* defaultDateFormat;
+
+ /**
+ * Method to retrieve default formats (or NULL on failure).
+ * These are semantically const, but may modify *this.
+ */
+ const NumberFormat* getDefaultNumberFormat(UErrorCode&) const;
+ const DateFormat* getDefaultDateFormat(UErrorCode&) const;
+
+ /**
+ * Finds the word s, in the keyword list and returns the located index.
+ * @param s the keyword to be searched for.
+ * @param list the list of keywords to be searched with.
+ * @return the index of the list which matches the keyword s.
+ */
+ static int32_t findKeyword( const UnicodeString& s,
+ const UChar * const *list);
+
+ /**
+ * Formats the array of arguments and copies the result into the
+ * result buffer, updates the field position.
+ *
+ * @param arguments The formattable objects array.
+ * @param cnt The array count.
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param status Field position status.
+ * @param recursionProtection
+ * Initially zero. Bits 0..9 are used to indicate
+ * that a parameter has already been seen, to
+ * avoid recursion. Currently unused.
+ * @param success The error code status.
+ * @return Reference to 'appendTo' parameter.
+ */
+ UnicodeString& format( const Formattable* arguments,
+ int32_t cnt,
+ UnicodeString& appendTo,
+ FieldPosition& status,
+ int32_t recursionProtection,
+ UErrorCode& success) const;
+
+ UnicodeString& format( const Formattable* arguments,
+ const UnicodeString *argumentNames,
+ int32_t cnt,
+ UnicodeString& appendTo,
+ FieldPosition& status,
+ int32_t recursionProtection,
+ UErrorCode& success) const;
+
+ void makeFormat(int32_t offsetNumber,
+ UnicodeString* segments,
+ UParseError& parseError,
+ UErrorCode& success);
+
+ /**
+ * Convenience method that ought to be in NumberFormat
+ */
+ NumberFormat* createIntegerFormat(const Locale& locale, UErrorCode& status) const;
+
+ /**
+ * Checks the range of the source text to quote the special
+ * characters, { and ' and copy to target buffer.
+ * @param source
+ * @param start the text offset to start the process of in the source string
+ * @param end the text offset to end the process of in the source string
+ * @param appendTo Output parameter to receive result.
+ * Result is appended to existing contents.
+ */
+ static void copyAndFixQuotes(const UnicodeString& appendTo, int32_t start, int32_t end, UnicodeString& target);
+
+ /**
+ * Returns array of argument types in the parsed pattern
+ * for use in C API. Only for the use of umsg_vformat(). Not
+ * for public consumption.
+ * @param listCount Output parameter to receive the size of array
+ * @return The array of formattable types in the pattern
+ * @internal
+ */
+ const Formattable::Type* getArgTypeList(int32_t& listCount) const {
+ listCount = argTypeCount;
+ return argTypes;
+ }
+
+ /**
+ * Returns FALSE if the argument name is not legal.
+ * @param argName argument name.
+ * @return TRUE if the argument name is legal, otherwise return FALSE.
+ */
+ UBool isLegalArgName(const UnicodeString& argName) const;
+
+ friend class MessageFormatAdapter; // getFormatTypeList() access
+};
+
+inline UnicodeString&
+MessageFormat::format(const Formattable& obj,
+ UnicodeString& appendTo,
+ UErrorCode& status) const {
+ return Format::format(obj, appendTo, status);
+}
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif // _MSGFMT
+//eof
Property changes on: icu46/source/i18n/unicode/msgfmt.h
___________________________________________________________________
Added: svn:eol-style
+ LF
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