| Current File : //opt/alt/libicu/usr/include/unicode/ulistformatter.h |
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*****************************************************************************************
* Copyright (C) 2015-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*****************************************************************************************
*/
#ifndef ULISTFORMATTER_H
#define ULISTFORMATTER_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/localpointer.h"
#include "unicode/uformattedvalue.h"
/**
* \file
* \brief C API: Format a list in a locale-appropriate way.
*
* A UListFormatter is used to format a list of items in a locale-appropriate way,
* using data from CLDR.
* Example: Input data ["Alice", "Bob", "Charlie", "Delta"] will be formatted
* as "Alice, Bob, Charlie, and Delta" in English.
*/
/**
* Opaque UListFormatter object for use in C
* @stable ICU 55
*/
struct UListFormatter;
typedef struct UListFormatter UListFormatter; /**< C typedef for struct UListFormatter. @stable ICU 55 */
#ifndef U_HIDE_DRAFT_API
struct UFormattedList;
/**
* Opaque struct to contain the results of a UListFormatter operation.
* @draft ICU 64
*/
typedef struct UFormattedList UFormattedList;
#endif /* U_HIDE_DRAFT_API */
#ifndef U_HIDE_DRAFT_API
/**
* FieldPosition and UFieldPosition selectors for format fields
* defined by ListFormatter.
* @draft ICU 63
*/
typedef enum UListFormatterField {
/**
* The literal text in the result which came from the resources.
* @draft ICU 63
*/
ULISTFMT_LITERAL_FIELD,
/**
* The element text in the result which came from the input strings.
* @draft ICU 63
*/
ULISTFMT_ELEMENT_FIELD
} UListFormatterField;
#endif // U_HIDE_DRAFT_API
/**
* Open a new UListFormatter object using the rules for a given locale.
* @param locale
* The locale whose rules should be used; may be NULL for
* default locale.
* @param status
* A pointer to a standard ICU UErrorCode (input/output parameter).
* Its input value must pass the U_SUCCESS() test, or else the
* function returns immediately. The caller should check its output
* value with U_FAILURE(), or use with function chaining (see User
* Guide for details).
* @return
* A pointer to a UListFormatter object for the specified locale,
* or NULL if an error occurred.
* @stable ICU 55
*/
U_CAPI UListFormatter* U_EXPORT2
ulistfmt_open(const char* locale,
UErrorCode* status);
/**
* Close a UListFormatter object. Once closed it may no longer be used.
* @param listfmt
* The UListFormatter object to close.
* @stable ICU 55
*/
U_CAPI void U_EXPORT2
ulistfmt_close(UListFormatter *listfmt);
#ifndef U_HIDE_DRAFT_API
/**
* Creates an object to hold the result of a UListFormatter
* operation. The object can be used repeatedly; it is cleared whenever
* passed to a format function.
*
* @param ec Set if an error occurs.
* @return A pointer needing ownership.
* @draft ICU 64
*/
U_CAPI UFormattedList* U_EXPORT2
ulistfmt_openResult(UErrorCode* ec);
/**
* Returns a representation of a UFormattedList as a UFormattedValue,
* which can be subsequently passed to any API requiring that type.
*
* The returned object is owned by the UFormattedList and is valid
* only as long as the UFormattedList is present and unchanged in memory.
*
* You can think of this method as a cast between types.
*
* When calling ufmtval_nextPosition():
* The fields are returned from start to end. The special field category
* UFIELD_CATEGORY_LIST_SPAN is used to indicate which argument
* was inserted at the given position. The span category will
* always occur before the corresponding instance of UFIELD_CATEGORY_LIST
* in the ufmtval_nextPosition() iterator.
*
* @param uresult The object containing the formatted string.
* @param ec Set if an error occurs.
* @return A UFormattedValue owned by the input object.
* @draft ICU 64
*/
U_CAPI const UFormattedValue* U_EXPORT2
ulistfmt_resultAsValue(const UFormattedList* uresult, UErrorCode* ec);
/**
* Releases the UFormattedList created by ulistfmt_openResult().
*
* @param uresult The object to release.
* @draft ICU 64
*/
U_CAPI void U_EXPORT2
ulistfmt_closeResult(UFormattedList* uresult);
#endif /* U_HIDE_DRAFT_API */
#if U_SHOW_CPLUSPLUS_API
U_NAMESPACE_BEGIN
/**
* \class LocalUListFormatterPointer
* "Smart pointer" class, closes a UListFormatter via ulistfmt_close().
* For most methods see the LocalPointerBase base class.
*
* @see LocalPointerBase
* @see LocalPointer
* @stable ICU 55
*/
U_DEFINE_LOCAL_OPEN_POINTER(LocalUListFormatterPointer, UListFormatter, ulistfmt_close);
#ifndef U_HIDE_DRAFT_API
/**
* \class LocalUFormattedListPointer
* "Smart pointer" class, closes a UFormattedList via ulistfmt_closeResult().
* For most methods see the LocalPointerBase base class.
*
* @see LocalPointerBase
* @see LocalPointer
* @draft ICU 64
*/
U_DEFINE_LOCAL_OPEN_POINTER(LocalUFormattedListPointer, UFormattedList, ulistfmt_closeResult);
#endif /* U_HIDE_DRAFT_API */
U_NAMESPACE_END
#endif
/**
* Formats a list of strings using the conventions established for the
* UListFormatter object.
* @param listfmt
* The UListFormatter object specifying the list conventions.
* @param strings
* An array of pointers to UChar strings; the array length is
* specified by stringCount. Must be non-NULL if stringCount > 0.
* @param stringLengths
* An array of string lengths corresponding to the strings[]
* parameter; any individual length value may be negative to indicate
* that the corresponding strings[] entry is 0-terminated, or
* stringLengths itself may be NULL if all of the strings are
* 0-terminated. If non-NULL, the stringLengths array must have
* stringCount entries.
* @param stringCount
* the number of entries in strings[], and the number of entries
* in the stringLengths array if it is not NULL. Must be >= 0.
* @param result
* A pointer to a buffer to receive the formatted list.
* @param resultCapacity
* The maximum size of result.
* @param status
* A pointer to a standard ICU UErrorCode (input/output parameter).
* Its input value must pass the U_SUCCESS() test, or else the
* function returns immediately. The caller should check its output
* value with U_FAILURE(), or use with function chaining (see User
* Guide for details).
* @return
* The total buffer size needed; if greater than resultLength, the
* output was truncated. May be <=0 if unable to determine the
* total buffer size needed (e.g. for illegal arguments).
* @stable ICU 55
*/
U_CAPI int32_t U_EXPORT2
ulistfmt_format(const UListFormatter* listfmt,
const UChar* const strings[],
const int32_t * stringLengths,
int32_t stringCount,
UChar* result,
int32_t resultCapacity,
UErrorCode* status);
#ifndef U_HIDE_DRAFT_API
/**
* Formats a list of strings to a UFormattedList, which exposes more
* information than the string exported by ulistfmt_format().
*
* @param listfmt
* The UListFormatter object specifying the list conventions.
* @param strings
* An array of pointers to UChar strings; the array length is
* specified by stringCount. Must be non-NULL if stringCount > 0.
* @param stringLengths
* An array of string lengths corresponding to the strings[]
* parameter; any individual length value may be negative to indicate
* that the corresponding strings[] entry is 0-terminated, or
* stringLengths itself may be NULL if all of the strings are
* 0-terminated. If non-NULL, the stringLengths array must have
* stringCount entries.
* @param stringCount
* the number of entries in strings[], and the number of entries
* in the stringLengths array if it is not NULL. Must be >= 0.
* @param uresult
* The object in which to store the result of the list formatting
* operation. See ulistfmt_openResult().
* @param status
* Error code set if an error occurred during formatting.
* @draft ICU 64
*/
U_CAPI void U_EXPORT2
ulistfmt_formatStringsToResult(
const UListFormatter* listfmt,
const UChar* const strings[],
const int32_t * stringLengths,
int32_t stringCount,
UFormattedList* uresult,
UErrorCode* status);
#endif /* U_HIDE_DRAFT_API */
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif