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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/********************************************************************
+ * COPYRIGHT: 
+ * Copyright (c) 1997-2011, International Business Machines Corporation and
+ * others. All Rights Reserved.
+ * Copyright (C) 2010 , Yahoo! Inc. 
+ ********************************************************************
+ *
+ *   file name:  umsg.h
+ *   encoding:   US-ASCII
+ *   tab size:   8 (not used)
+ *   indentation:4
+ *
+ *   Change history:
+ *
+ *   08/5/2001  Ram         Added C wrappers for C++ API.
+ ********************************************************************/
+
+#ifndef UMSG_H
+#define UMSG_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/localpointer.h"
+#include "unicode/uloc.h"
+#include "unicode/parseerr.h"
+#include <stdarg.h>
+
+/**
+ * \file
+ * \brief C API: MessageFormat
+ *
+ * <h2>MessageFormat C API </h2>
+ *
+ * <p>MessageFormat prepares strings for display to users,
+ * with optional arguments (variables/placeholders).
+ * The arguments can occur in any order, which is necessary for translation
+ * into languages with different grammars.
+ *
+ * <p>The opaque UMessageFormat type is a thin C wrapper around
+ * a C++ MessageFormat. It is constructed from a <em>pattern</em> string
+ * with arguments in {curly braces} which will be replaced by formatted values.
+ *
+ * <p>Currently, the C API supports only numbered arguments.
+ *
+ * <p>For details about the pattern syntax and behavior,
+ * especially about the ASCII apostrophe vs. the
+ * real apostrophe (single quote) character \htmlonly&#x2019;\endhtmlonly (U+2019),
+ * see the C++ MessageFormat class documentation.
+ *
+ * <p>Here are some examples of C API usage:
+ * Example 1:
+ * <pre>
+ * \code
+ *     UChar *result, *tzID, *str;
+ *     UChar pattern[100];
+ *     int32_t resultLengthOut, resultlength;
+ *     UCalendar *cal;
+ *     UDate d1;
+ *     UDateFormat *def1;
+ *     UErrorCode status = U_ZERO_ERROR;
+ *
+ *     str=(UChar*)malloc(sizeof(UChar) * (strlen("disturbance in force") +1));
+ *     u_uastrcpy(str, "disturbance in force");
+ *     tzID=(UChar*)malloc(sizeof(UChar) * 4);
+ *     u_uastrcpy(tzID, "PST");
+ *     cal=ucal_open(tzID, u_strlen(tzID), "en_US", UCAL_TRADITIONAL, &status);
+ *     ucal_setDateTime(cal, 1999, UCAL_MARCH, 18, 0, 0, 0, &status);
+ *     d1=ucal_getMillis(cal, &status);
+ *     u_uastrcpy(pattern, "On {0, date, long}, there was a {1} on planet {2,number,integer}");
+ *     resultlength=0;
+ *     resultLengthOut=u_formatMessage( "en_US", pattern, u_strlen(pattern), NULL, resultlength, &status, d1, str, 7);
+ *     if(status==U_BUFFER_OVERFLOW_ERROR){
+ *         status=U_ZERO_ERROR;
+ *         resultlength=resultLengthOut+1;
+ *         result=(UChar*)realloc(result, sizeof(UChar) * resultlength);
+ *         u_formatMessage( "en_US", pattern, u_strlen(pattern), result, resultlength, &status, d1, str, 7);
+ *     }
+ *     printf("%s\n", austrdup(result) );//austrdup( a function used to convert UChar* to char*)
+ *     //output>: "On March 18, 1999, there was a disturbance in 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
+ *     UChar* str;
+ *     UErrorCode status = U_ZERO_ERROR;
+ *     UChar *result;
+ *     UChar pattern[100];
+ *     int32_t resultlength, resultLengthOut, i;
+ *     double testArgs= { 100.0, 1.0, 0.0};
+ *
+ *     str=(UChar*)malloc(sizeof(UChar) * 10);
+ *     u_uastrcpy(str, "MyDisk");
+ *     u_uastrcpy(pattern, "The disk {1} contains {0,choice,0#no files|1#one file|1<{0,number,integer} files}");
+ *     for(i=0; i<3; i++){
+ *       resultlength=0; 
+ *       resultLengthOut=u_formatMessage( "en_US", pattern, u_strlen(pattern), NULL, resultlength, &status, testArgs[i], str); 
+ *       if(status==U_BUFFER_OVERFLOW_ERROR){
+ *         status=U_ZERO_ERROR;
+ *         resultlength=resultLengthOut+1;
+ *         result=(UChar*)malloc(sizeof(UChar) * resultlength);
+ *         u_formatMessage( "en_US", pattern, u_strlen(pattern), result, resultlength, &status, testArgs[i], str);
+ *       }
+ *       printf("%s\n", austrdup(result) );  //austrdup( a function used to convert UChar* to char*)
+ *       free(result);
+ *     }
+ *     // output, with different testArgs:
+ *     // output: The disk "MyDisk" contains 100 files.
+ *     // output: The disk "MyDisk" contains one file.
+ *     // output: The disk "MyDisk" contains no files.
+ * \endcode
+ *  </pre>
+ *
+ *
+ * Example 3:
+ * <pre>
+ * \code
+ * UChar* str;
+ * UChar* str1;
+ * UErrorCode status = U_ZERO_ERROR;
+ * UChar *result;
+ * UChar pattern[100];
+ * UChar expected[100];
+ * int32_t resultlength,resultLengthOut;
+
+ * str=(UChar*)malloc(sizeof(UChar) * 25);
+ * u_uastrcpy(str, "Kirti");
+ * str1=(UChar*)malloc(sizeof(UChar) * 25);
+ * u_uastrcpy(str1, "female");
+ * log_verbose("Testing message format with Select test #1\n:");
+ * u_uastrcpy(pattern, "{0} est {1, select, female {all\\u00E9e} other {all\\u00E9}} \\u00E0 Paris.");
+ * u_uastrcpy(expected, "Kirti est all\\u00E9e \\u00E0 Paris.");
+ * resultlength=0;
+ * resultLengthOut=u_formatMessage( "fr", pattern, u_strlen(pattern), NULL, resultlength, &status, str , str1);
+ * if(status==U_BUFFER_OVERFLOW_ERROR)
+ *  {
+ *      status=U_ZERO_ERROR;
+ *      resultlength=resultLengthOut+1;
+ *      result=(UChar*)malloc(sizeof(UChar) * resultlength);
+ *      u_formatMessage( "fr", pattern, u_strlen(pattern), result, resultlength, &status, str , str1);
+ *      if(u_strcmp(result, expected)==0)
+ *          log_verbose("PASS: MessagFormat successful on Select test#1\n");
+ *      else{
+ *          log_err("FAIL: Error in MessageFormat on Select test#1\n GOT %s EXPECTED %s\n", austrdup(result),
+ *          austrdup(expected) );
+ *      }
+ *      free(result);
+ * }
+ * \endcode
+ *  </pre>
+ */
+
+/**
+ * Format a message for a locale.
+ * This function may perform re-ordering of the arguments depending on the
+ * locale. For all numeric arguments, double is assumed unless the type is
+ * explicitly integer.  All choice format arguments must be of type double.
+ * @param locale The locale for which the message will be formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param result A pointer to a buffer to receive the formatted message.
+ * @param resultLength The maximum size of result.
+ * @param status A pointer to an UErrorCode to receive any errors
+ * @param ... A variable-length argument list containing the arguments specified
+ * in pattern.
+ * @return The total buffer size needed; if greater than resultLength, the
+ * output was truncated.
+ * @see u_parseMessage
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2 
+u_formatMessage(const char  *locale,
+                 const UChar *pattern,
+                int32_t     patternLength,
+                UChar       *result,
+                int32_t     resultLength,
+                UErrorCode  *status,
+                ...);
+
+/**
+ * Format a message for a locale.
+ * This function may perform re-ordering of the arguments depending on the
+ * locale. For all numeric arguments, double is assumed unless the type is
+ * explicitly integer.  All choice format arguments must be of type double.
+ * @param locale The locale for which the message will be formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param result A pointer to a buffer to receive the formatted message.
+ * @param resultLength The maximum size of result.
+ * @param ap A variable-length argument list containing the arguments specified
+ * @param status A pointer to an UErrorCode to receive any errors
+ * in pattern.
+ * @return The total buffer size needed; if greater than resultLength, the
+ * output was truncated.
+ * @see u_parseMessage
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2 
+u_vformatMessage(   const char  *locale,
+                    const UChar *pattern,
+                    int32_t     patternLength,
+                    UChar       *result,
+                    int32_t     resultLength,
+                    va_list     ap,
+                    UErrorCode  *status);
+
+/**
+ * Parse a message.
+ * For numeric arguments, this function will always use doubles.  Integer types
+ * should not be passed.
+ * This function is not able to parse all output from {@link #u_formatMessage }.
+ * @param locale The locale for which the message is formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param source The text to parse.
+ * @param sourceLength The length of source, or -1 if null-terminated.
+ * @param status A pointer to an UErrorCode to receive any errors
+ * @param ... A variable-length argument list containing the arguments
+ * specified in pattern.
+ * @see u_formatMessage
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+u_parseMessage( const char   *locale,
+                const UChar  *pattern,
+                int32_t      patternLength,
+                const UChar  *source,
+                int32_t      sourceLength,
+                UErrorCode   *status,
+                ...);
+
+/**
+ * Parse a message.
+ * For numeric arguments, this function will always use doubles.  Integer types
+ * should not be passed.
+ * This function is not able to parse all output from {@link #u_formatMessage }.
+ * @param locale The locale for which the message is formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param source The text to parse.
+ * @param sourceLength The length of source, or -1 if null-terminated.
+ * @param ap A variable-length argument list containing the arguments
+ * @param status A pointer to an UErrorCode to receive any errors
+ * specified in pattern.
+ * @see u_formatMessage
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+u_vparseMessage(const char  *locale,
+                const UChar *pattern,
+                int32_t     patternLength,
+                const UChar *source,
+                int32_t     sourceLength,
+                va_list     ap,
+                UErrorCode  *status);
+
+/**
+ * Format a message for a locale.
+ * This function may perform re-ordering of the arguments depending on the
+ * locale. For all numeric arguments, double is assumed unless the type is
+ * explicitly integer.  All choice format arguments must be of type double.
+ * @param locale The locale for which the message will be formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param result A pointer to a buffer to receive the formatted message.
+ * @param resultLength The maximum size of result.
+ * @param status A pointer to an UErrorCode to receive any errors
+ * @param ... A variable-length argument list containing the arguments specified
+ * in pattern.
+ * @param parseError  A pointer to UParseError to receive information about errors
+ *                     occurred during parsing.
+ * @return The total buffer size needed; if greater than resultLength, the
+ * output was truncated.
+ * @see u_parseMessage
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2 
+u_formatMessageWithError(   const char    *locale,
+                            const UChar   *pattern,
+                            int32_t       patternLength,
+                            UChar         *result,
+                            int32_t       resultLength,
+                            UParseError   *parseError,
+                            UErrorCode    *status,
+                            ...);
+
+/**
+ * Format a message for a locale.
+ * This function may perform re-ordering of the arguments depending on the
+ * locale. For all numeric arguments, double is assumed unless the type is
+ * explicitly integer.  All choice format arguments must be of type double.
+ * @param locale The locale for which the message will be formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param result A pointer to a buffer to receive the formatted message.
+ * @param resultLength The maximum size of result.
+ * @param parseError  A pointer to UParseError to receive information about errors
+ *                    occurred during parsing.
+ * @param ap A variable-length argument list containing the arguments specified
+ * @param status A pointer to an UErrorCode to receive any errors
+ * in pattern.
+ * @return The total buffer size needed; if greater than resultLength, the
+ * output was truncated.
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2 
+u_vformatMessageWithError(  const char   *locale,
+                            const UChar  *pattern,
+                            int32_t      patternLength,
+                            UChar        *result,
+                            int32_t      resultLength,
+                            UParseError* parseError,
+                            va_list      ap,
+                            UErrorCode   *status);
+
+/**
+ * Parse a message.
+ * For numeric arguments, this function will always use doubles.  Integer types
+ * should not be passed.
+ * This function is not able to parse all output from {@link #u_formatMessage }.
+ * @param locale The locale for which the message is formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param source The text to parse.
+ * @param sourceLength The length of source, or -1 if null-terminated.
+ * @param parseError  A pointer to UParseError to receive information about errors
+ *                     occurred during parsing.
+ * @param status A pointer to an UErrorCode to receive any errors
+ * @param ... A variable-length argument list containing the arguments
+ * specified in pattern.
+ * @see u_formatMessage
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+u_parseMessageWithError(const char  *locale,
+                        const UChar *pattern,
+                        int32_t     patternLength,
+                        const UChar *source,
+                        int32_t     sourceLength,
+                        UParseError *parseError,
+                        UErrorCode  *status,
+                        ...);
+
+/**
+ * Parse a message.
+ * For numeric arguments, this function will always use doubles.  Integer types
+ * should not be passed.
+ * This function is not able to parse all output from {@link #u_formatMessage }.
+ * @param locale The locale for which the message is formatted
+ * @param pattern The pattern specifying the message's format
+ * @param patternLength The length of pattern
+ * @param source The text to parse.
+ * @param sourceLength The length of source, or -1 if null-terminated.
+ * @param ap A variable-length argument list containing the arguments
+ * @param parseError  A pointer to UParseError to receive information about errors
+ *                     occurred during parsing.
+ * @param status A pointer to an UErrorCode to receive any errors
+ * specified in pattern.
+ * @see u_formatMessage
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+u_vparseMessageWithError(const char  *locale,
+                         const UChar *pattern,
+                         int32_t     patternLength,
+                         const UChar *source,
+                         int32_t     sourceLength,
+                         va_list     ap,
+                         UParseError *parseError,
+                         UErrorCode* status);
+
+/*----------------------- New experimental API --------------------------- */
+/** 
+ * The message format object
+ * @stable ICU 2.0
+ */
+typedef void* UMessageFormat;
+
+
+/**
+ * Open a message formatter with given pattern and for the given locale.
+ * @param pattern       A pattern specifying the format to use.
+ * @param patternLength Length of the pattern to use
+ * @param locale        The locale for which the messages are formatted.
+ * @param parseError    A pointer to UParseError struct to receive any errors 
+ *                      occured during parsing. Can be NULL.
+ * @param status        A pointer to an UErrorCode to receive any errors.
+ * @return              A pointer to a UMessageFormat to use for formatting 
+ *                      messages, or 0 if an error occurred. 
+ * @stable ICU 2.0
+ */
+U_STABLE UMessageFormat* U_EXPORT2 
+umsg_open(  const UChar     *pattern,
+            int32_t         patternLength,
+            const  char     *locale,
+            UParseError     *parseError,
+            UErrorCode      *status);
+
+/**
+ * Close a UMessageFormat.
+ * Once closed, a UMessageFormat may no longer be used.
+ * @param format The formatter to close.
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+umsg_close(UMessageFormat* format);
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUMessageFormatPointer
+ * "Smart pointer" class, closes a UMessageFormat via umsg_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 4.4
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUMessageFormatPointer, UMessageFormat, umsg_close);
+
+U_NAMESPACE_END
+
+#endif
+
+/**
+ * Open a copy of a UMessageFormat.
+ * This function performs a deep copy.
+ * @param fmt The formatter to copy
+ * @param status A pointer to an UErrorCode to receive any errors.
+ * @return A pointer to a UDateFormat identical to fmt.
+ * @stable ICU 2.0
+ */
+U_STABLE UMessageFormat U_EXPORT2 
+umsg_clone(const UMessageFormat *fmt,
+           UErrorCode *status);
+
+/**
+ * Sets the locale. This locale is used for fetching default number or date
+ * format information.
+ * @param fmt The formatter to set
+ * @param locale The locale the formatter should use.
+ * @stable ICU 2.0
+ */
+U_STABLE void  U_EXPORT2 
+umsg_setLocale(UMessageFormat *fmt,
+               const char* locale);
+
+/**
+ * Gets the locale. This locale is used for fetching default number or date
+ * format information.
+ * @param fmt The formatter to querry
+ * @return the locale.
+ * @stable ICU 2.0
+ */
+U_STABLE const char*  U_EXPORT2 
+umsg_getLocale(const UMessageFormat *fmt);
+
+/**
+ * Sets the pattern.
+ * @param fmt           The formatter to use
+ * @param pattern       The pattern to be applied.
+ * @param patternLength Length of the pattern to use
+ * @param parseError    Struct to receive information on position 
+ *                      of error if an error is encountered.Can be NULL.
+ * @param status        Output param set to success/failure code on
+ *                      exit. If the pattern is invalid, this will be
+ *                      set to a failure result.
+ * @stable ICU 2.0
+ */
+U_STABLE void  U_EXPORT2 
+umsg_applyPattern( UMessageFormat *fmt,
+                   const UChar* pattern,
+                   int32_t patternLength,
+                   UParseError* parseError,
+                   UErrorCode* status);
+
+/**
+ * Gets the pattern.
+ * @param fmt          The formatter to use
+ * @param result       A pointer to a buffer to receive the pattern.
+ * @param resultLength The maximum size of result.
+ * @param status       Output param set to success/failure code on
+ *                     exit. If the pattern is invalid, this will be
+ *                     set to a failure result.  
+ * @return the pattern of the format
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t  U_EXPORT2 
+umsg_toPattern(const UMessageFormat *fmt,
+               UChar* result, 
+               int32_t resultLength,
+               UErrorCode* status);
+
+/**
+ * Format a message for a locale.
+ * This function may perform re-ordering of the arguments depending on the
+ * locale. For all numeric arguments, double is assumed unless the type is
+ * explicitly integer.  All choice format arguments must be of type double.
+ * @param fmt           The formatter to use
+ * @param result        A pointer to a buffer to receive the formatted message.
+ * @param resultLength  The maximum size of result.
+ * @param status        A pointer to an UErrorCode to receive any errors
+ * @param ...           A variable-length argument list containing the arguments 
+ *                      specified in pattern.
+ * @return              The total buffer size needed; if greater than resultLength, 
+ *                      the output was truncated.
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2 
+umsg_format(    const UMessageFormat *fmt,
+                UChar          *result,
+                int32_t        resultLength,
+                UErrorCode     *status,
+                ...);
+
+/**
+ * Format a message for a locale.
+ * This function may perform re-ordering of the arguments depending on the
+ * locale. For all numeric arguments, double is assumed unless the type is
+ * explicitly integer.  All choice format arguments must be of type double.
+ * @param fmt          The formatter to use 
+ * @param result       A pointer to a buffer to receive the formatted message.
+ * @param resultLength The maximum size of result.
+ * @param ap           A variable-length argument list containing the arguments 
+ * @param status       A pointer to an UErrorCode to receive any errors
+ *                     specified in pattern.
+ * @return             The total buffer size needed; if greater than resultLength, 
+ *                     the output was truncated.
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2 
+umsg_vformat(   const UMessageFormat *fmt,
+                UChar          *result,
+                int32_t        resultLength,
+                va_list        ap,
+                UErrorCode     *status);
+
+/**
+ * Parse a message.
+ * For numeric arguments, this function will always use doubles.  Integer types
+ * should not be passed.
+ * This function is not able to parse all output from {@link #umsg_format }.
+ * @param fmt           The formatter to use 
+ * @param source        The text to parse.
+ * @param sourceLength  The length of source, or -1 if null-terminated.
+ * @param count         Output param to receive number of elements returned.
+ * @param status        A pointer to an UErrorCode to receive any errors
+ * @param ...           A variable-length argument list containing the arguments
+ *                      specified in pattern.
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+umsg_parse( const UMessageFormat *fmt,
+            const UChar    *source,
+            int32_t        sourceLength,
+            int32_t        *count,
+            UErrorCode     *status,
+            ...);
+
+/**
+ * Parse a message.
+ * For numeric arguments, this function will always use doubles.  Integer types
+ * should not be passed.
+ * This function is not able to parse all output from {@link #umsg_format }.
+ * @param fmt           The formatter to use 
+ * @param source        The text to parse.
+ * @param sourceLength  The length of source, or -1 if null-terminated.
+ * @param count         Output param to receive number of elements returned.
+ * @param ap            A variable-length argument list containing the arguments
+ * @param status        A pointer to an UErrorCode to receive any errors
+ *                      specified in pattern.
+ * @see u_formatMessage
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2 
+umsg_vparse(const UMessageFormat *fmt,
+            const UChar    *source,
+            int32_t        sourceLength,
+            int32_t        *count,
+            va_list        ap,
+            UErrorCode     *status);
+
+
+/**
+ * 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 patternLength the length of pattern, or -1 if unknown and pattern is null-terminated
+ * @param dest the buffer for the result, or NULL if preflight only
+ * @param destCapacity the length of the buffer, or 0 if preflighting
+ * @param ec the error code
+ * @return the length of the resulting text, not including trailing null
+ *        if buffer has room for the trailing null, it is provided, otherwise
+ *        not
+ * @stable ICU 3.4
+ */
+U_STABLE int32_t U_EXPORT2 
+umsg_autoQuoteApostrophe(const UChar* pattern, 
+                         int32_t patternLength,
+                         UChar* dest,
+                         int32_t destCapacity,
+                         UErrorCode* ec);
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif