559 lines
22 KiB
C++
559 lines
22 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 MSGFMT.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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* 03/20/97 helena Finished first cut of implementation.
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* 07/22/98 stephen Removed operator!= (defined in Format)
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********************************************************************************
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*/
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// *****************************************************************************
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// This file was generated from the java source file MessageFormat.java
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// *****************************************************************************
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#ifndef MSGFMT_H
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#define MSGFMT_H
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#include "utypes.h"
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#include "format.h"
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#include "locid.h"
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class NumberFormat;
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/**
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* Provides means to produce concatenated messages in language-neutral way.
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* Use this for all concatenations that show up to end users.
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* <P>
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* Takes a set of objects, formats them, then inserts the formatted
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* strings into the pattern at the appropriate places.
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* <P>
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* Here are some examples of usage:
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* Example 1:
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* <pre>
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* . UErrorCode success = ZERO_ERROR;
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* . GregorianCalendar cal(success);
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* . Formattable arguments[] = {
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* . 7L,
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* . Formattable( (Date) cal.getTime(success), Formattable::kIsDate),
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* . "a disturbance in the Force"
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* . };
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* .
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* . UnicodeString result;
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* . MessageFormat::format(
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* . "At {1,time} on {1,date}, there was {2} on planet {0,number}.",
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* . arguments, 3, result, success );
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* .
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* . cout << "result: " << result << endl;
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* . //<output>: At 4:34:20 PM on 23-Mar-98, there was a disturbance
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* . // in the Force on planet 7.
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* </pre>
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* Typically, the message format will come from resources, and the
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* arguments will be dynamically set at runtime.
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* <P>
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* Example 2:
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* <pre>
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* . success = ZERO_ERROR;
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* . Formattable testArgs[] = {3L, "MyDisk"};
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* .
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* . MessageFormat* form = new MessageFormat(
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* . "The disk \"{1}\" contains {0} file(s).", success );
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* .
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* . UnicodeString string;
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* . FieldPosition fpos = 0;
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* . cout << "format: " << form->format(testArgs, 2, string, fpos, success ) << endl;
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* .
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* . // output, with different testArgs:
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* . // output: The disk "MyDisk" contains 0 file(s).
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* . // output: The disk "MyDisk" contains 1 file(s).
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* . // output: The disk "MyDisk" contains 1,273 file(s).
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* . de lete form;
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* </pre>
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*
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* The pattern is of the following form. Legend:
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* <pre>
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* . {optional item}
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* . (group that may be repeated)*
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* </pre>
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* Do not confuse optional items with items inside quotes braces, such
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* as this: "{". Quoted braces are literals.
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* <pre>
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* . messageFormatPattern := string ( "{" messageFormatElement "}" string )*
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* .
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* . messageFormatElement := argument { "," elementFormat }
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* .
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* . elementFormat := "time" { "," datetimeStyle }
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* . | "date" { "," datetimeStyle }
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* . | "number" { "," numberStyle }
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* . | "choice" "," choiceStyle
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* .
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* . datetimeStyle := "short"
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* . | "medium"
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* . | "long"
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* . | "full"
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* . | dateFormatPattern
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* .
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* . numberStyle := "currency"
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* . | "percent"
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* . | "integer"
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* . | numberFormatPattern
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* .
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* . choiceStyle := choiceFormatPattern
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* </pre>
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* If there is no elementFormat, then the argument must be a string,
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* which is substituted. If there is no dateTimeStyle or numberStyle,
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* then the default format is used (e.g. NumberFormat.getInstance(),
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* DateFormat.getDefaultTime() or DateFormat.getDefaultDate(). For
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* a ChoiceFormat, the pattern must always be specified, since there
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* is no default.
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* <P>
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* In strings, single quotes can be used to quote the "{" sign if
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* necessary. A real single quote is represented by ''. Inside a
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* messageFormatElement, quotes are [not] removed. For example,
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* {1,number,$'#',##} will produce a number format with the pound-sign
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* quoted, with a result such as: "$#31,45".
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* <P>
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* If a pattern is used, then unquoted braces in the pattern, if any,
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* must match: that is, "ab {0} de" and "ab '}' de" are ok, but "ab
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* {0'}' de" and "ab } de" are not.
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* <P>
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* The argument is a number from 0 to 9, which corresponds to the
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* arguments presented in an array to be formatted.
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* <P>
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* It is ok to have unused arguments in the array. With missing
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* arguments or arguments that are not of the right class for the
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* specified format, a failing UErrorCode result is set.
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* <P>
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* For more sophisticated patterns, you can use a ChoiceFormat to get
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* output such as:
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* <pre>
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* . UErrorCode success = ZERO_ERROR;
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* . MessageFormat* form = new MessageFormat("The disk \"{1}\" contains {0}.", success);
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* . double filelimits[] = {0,1,2};
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* . UnicodeString filepart[] = {"no files","one file","{0,number} files"};
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* . ChoiceFormat* fileform = new ChoiceFormat(filelimits, filepart, 3);
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* . form->setFormat(1, *fileform); // NOT zero, see below
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* .
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* . Formattable testArgs[] = {1273L, "MyDisk"};
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* .
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* . UnicodeString string;
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* . FieldPosition fpos = 0;
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* . cout << form->format(testArgs, 2, string, fpos, success) << endl;
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* .
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* . // output, with different testArgs
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* . // output: The disk "MyDisk" contains no files.
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* . // output: The disk "MyDisk" contains one file.
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* . // output: The disk "MyDisk" contains 1,273 files.
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* </pre>
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* You can either do this programmatically, as in the above example,
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* or by using a pattern (see ChoiceFormat for more information) as in:
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* <pre>
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* . form->applyPattern(
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* . "There {0,choice,0#are no files|1#is one file|1<are {0,number,integer} files}.");
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* </pre>
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* <P>
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* [Note:] As we see above, the string produced by a ChoiceFormat in
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* MessageFormat is treated specially; occurances of '{' are used to
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* indicated subformats, and cause recursion. If you create both a
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* MessageFormat and ChoiceFormat programmatically (instead of using
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* the string patterns), then be careful not to produce a format that
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* recurses on itself, which will cause an infinite loop.
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* <P>
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* [Note:] Formats are numbered by order of variable in the string.
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* This is [not] the same as the argument numbering!
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* <pre>
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* . For example: with "abc{2}def{3}ghi{0}...",
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* .
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* . format0 affects the first variable {2}
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* . format1 affects the second variable {3}
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* . format2 affects the second variable {0}
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* </pre>
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* and so on.
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*/
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class U_I18N_API MessageFormat : public Format {
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public:
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enum EFormatNumber { kMaxFormat = 10 };
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/**
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* Construct a new MessageFormat using the given pattern.
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*
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* @param pattern Pattern used to construct object.
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* @param status Output param to receive success code. If the
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* pattern cannot be parsed, set to failure code.
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*/
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MessageFormat(const UnicodeString& pattern,
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UErrorCode &status);
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/**
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* Constructor that allows locale specification.
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* @param pattern Pattern used to construct object.
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* @param newLocale The locale to use for formatting dates and numbers.
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* @param status Output param to receive success code. If the
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* pattern cannot be parsed, set to failure code.
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*/
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MessageFormat(const UnicodeString& pattern,
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const Locale& newLocale,
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UErrorCode& success);
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/**
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* Copy constructor.
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*/
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MessageFormat(const MessageFormat&);
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/**
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* Assignment operator.
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*/
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const MessageFormat& operator=(const MessageFormat&);
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/**
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* Destructor.
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*/
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virtual ~MessageFormat();
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/**
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* Clone this Format object polymorphically. The caller owns the
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* result and should delete it when done.
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*/
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virtual Format* clone(void) const;
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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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* Sets the locale. This locale is used for fetching default number or date
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* format information.
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*/
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virtual void setLocale(const Locale& theLocale);
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/**
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* Gets the locale. This locale is used for fetching default number or date
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* format information.
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*/
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virtual const Locale& getLocale(void) const;
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/**
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* Apply the given pattern string to this message format.
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*
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* @param pattern The pattern to be applied.
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* @param status Output param set to success/failure code on
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* exit. If the pattern is invalid, this will be
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* set to a failure result.
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*/
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virtual void applyPattern(const UnicodeString& pattern,
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UErrorCode& status);
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/**
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* Gets the pattern. See the class description.
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*/
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virtual UnicodeString& toPattern(UnicodeString& result) const;
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/**
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* Sets formats to use on parameters.
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* See the class description about format numbering.
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* The caller should not delete the Format objects after this call.
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*/
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virtual void adoptFormats(Format** formatsToAdopt, int32_t count);
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/**
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* Sets formats to use on parameters.
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* See the class description about format numbering.
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*/
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virtual void setFormats(const Format** newFormats,int32_t cnt);
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/**
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* Sets formats individually to use on parameters.
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* See the class description about format numbering.
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* The caller should not delete the Format object after this call.
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*/
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virtual void adoptFormat(int32_t formatNumber, Format* formatToAdopt);
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/**
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* Sets formats individually to use on parameters.
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* See the class description about format numbering.
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*/
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virtual void setFormat(int32_t variable, const Format& newFormat);
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/**
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* Gets formats that were set with setFormats.
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* See the class description about format numbering.
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*/
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virtual const Format** getFormats(int32_t& count) const;
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/**
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* Returns pattern with formatted objects. Does not take ownership
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* of the Formattable* array; just reads it and uses it to generate
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* the format string.
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*
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* @param source An array of objects to be formatted & substituted.
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* @param result Where text is appended.
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* @param ignore No useful status is returned.
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*/
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UnicodeString& format( const Formattable* source,
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int32_t count,
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UnicodeString& result,
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FieldPosition& ignore,
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UErrorCode& success) const;
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/**
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* Convenience routine. Avoids explicit creation of
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* MessageFormat, but doesn't allow future optimizations.
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*/
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static UnicodeString& format( const UnicodeString& pattern,
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const Formattable* arguments,
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int32_t count,
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UnicodeString& result,
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UErrorCode& success);
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/**
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* Format an object to produce a message. This method handles
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* Formattable objects of type kArray. If the Formattable
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* object type is not of type kArray, 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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* Parses the string.
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* <P>
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* Caveats: The parse may fail in a number of circumstances. For
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* example:
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* <P>
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* If one of the arguments does not occur in the pattern.
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* <P>
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* If the format of an argument is loses information, such as with
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* a choice format where a large number formats to "many".
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* <P>
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* Does not yet handle recursion (where the substituted strings
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* contain {n} references.)
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* <P>
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* Will not always find a match (or the correct match) if some
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* part of the parse is ambiguous. For example, if the pattern
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* "{1},{2}" is used with the string arguments {"a,b", "c"}, it
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* will format as "a,b,c". When the result is parsed, it will
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* return {"a", "b,c"}.
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* <P>
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* If a single argument is formatted twice in the string, then the
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* later parse wins.
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*
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* @param source String to be parsed.
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* @param status On input, starting position for parse. On output,
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* final position after parse.
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* @param count Output param to receive size of returned array.
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* @result Array of Formattable objects, with length
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* 'count', owned by the caller.
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*/
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virtual Formattable* parse( const UnicodeString& source,
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ParsePosition& status,
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int32_t& count) const;
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/**
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* Parses the string. Does not yet handle recursion (where
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* the substituted strings contain {n} references.)
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*
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* @param source String to be parsed.
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* @param count Output param to receive size of returned array.
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* @param status Output param to receive success/error code.
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* @result Array of Formattable objects, with length
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* 'count', owned by the caller.
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*/
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virtual Formattable* parse( const UnicodeString& source,
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int32_t& count,
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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 message strings into arrays of Formattable objects.
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* Does not yet handle recursion (where the substituted strings
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* contain %n references.)
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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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public:
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/**
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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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*
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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;
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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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private:
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static char fgClassID;
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static NumberFormat* fgNumberFormat;
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// fgNumberFormat is held in a cache of one.
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static NumberFormat* getNumberFormat(UErrorCode &status); // call this function to 'check out' a numberformat from the cache.
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static void releaseNumberFormat(NumberFormat *adopt); // call this function to 'return' the number format to the cache.
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Locale fLocale;
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UnicodeString fPattern;
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// later, allow more than ten items
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Format *fFormats[kMaxFormat];
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int32_t *fOffsets;
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int32_t fCount;
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int32_t *fArgumentNumbers;
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int32_t fMaxOffset;
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/**
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* Internal routine used by format.
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* @param recursionProtection Initially zero. Bits 0..9 are used to indicate
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* that a parameter has already been seen, to avoid recursion. Currently
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* unused.
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*/
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static const int32_t fgListLength;
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static const UnicodeString fgTypeList[];
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static const UnicodeString fgModifierList[];
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static const UnicodeString fgDateModifierList[];
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/**
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* Finds the word s, in the keyword list and returns the located index.
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* @param s the keyword to be searched for.
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* @param list the list of keywords to be searched with.
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* @return the index of the list which matches the keyword s.
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*/
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static int32_t findKeyword( const UnicodeString& s,
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const UnicodeString* list);
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/**
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* Formats the array of arguments and copies the result into the result buffer,
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* updates the field position.
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* @param arguments the formattable objects array.
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* @param cnt the array count.
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* @param status field position status.
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* @param recursionProtection Initially zero. Bits 0..9 are used to indicate
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* that a parameter has already been seen, to avoid recursion. Currently
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* unused.
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* @param success the error code status.
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*/
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UnicodeString& format( const Formattable* arguments,
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int32_t cnt,
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UnicodeString& result,
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FieldPosition& status,
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int32_t recursionProtection,
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UErrorCode& success) const;
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/**
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* Checks the segments for the closest matched format instance and
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* updates the format array with the new format instance.
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* @param position the last processed offset in the pattern
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* @param offsetNumber the offset number of the last processed segment
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|
* @param segments the string that contains the parsed pattern segments.
|
|
* @param success the error code
|
|
*/
|
|
void makeFormat( int32_t position,
|
|
int32_t offsetNumber,
|
|
UnicodeString* segments,
|
|
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 target the result buffer
|
|
*/
|
|
static void copyAndFixQuotes(const UnicodeString& source, int32_t start, int32_t end, UnicodeString& target);
|
|
|
|
/**
|
|
* Converts a string to an integer value using a default NumberFormat object
|
|
* which is static (shared by all MessageFormat instances). This replaces
|
|
* a call to wtoi().
|
|
* @param string the source string to convert with
|
|
* @param status the error code.
|
|
* @return the converted number.
|
|
*/
|
|
static int32_t stoi(const UnicodeString& string, UErrorCode& status);
|
|
|
|
/**
|
|
* Converts an integer value to a string using a default NumberFormat object
|
|
* which is static (shared by all MessageFormat instances). This replaces
|
|
* a call to wtoi().
|
|
* @param i the integer to format
|
|
* @param string the destination string
|
|
* @return a reference to string.
|
|
*/
|
|
static UnicodeString& itos(int32_t i, UnicodeString& string);
|
|
};
|
|
|
|
inline ClassID
|
|
MessageFormat::getDynamicClassID() const
|
|
{
|
|
return MessageFormat::getStaticClassID();
|
|
}
|
|
|
|
#endif // _MSGFMT
|
|
//eof
|