DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (cdf352f02ac4)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441
// © 2018 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

#ifndef __UFORMATTEDVALUE_H__
#define __UFORMATTEDVALUE_H__

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/ufieldpositer.h"

#ifndef U_HIDE_DRAFT_API

/**
 * \file
 * \brief C API: Abstract operations for localized strings.
 * 
 * This file contains declarations for classes that deal with formatted strings. A number
 * of APIs throughout ICU use these classes for expressing their localized output.
 */


/**
 * All possible field categories in ICU. Every entry in this enum corresponds
 * to another enum that exists in ICU.
 * 
 * In the APIs that take a UFieldCategory, an int32_t type is used. Field
 * categories having any of the top four bits turned on are reserved as
 * private-use for external APIs implementing FormattedValue. This means that
 * categories 2^28 and higher or below zero (with the highest bit turned on)
 * are private-use and will not be used by ICU in the future.
 *
 * @draft ICU 64
 */
typedef enum UFieldCategory {
    /**
     * For an undefined field category.
     * 
     * @draft ICU 64
     */
    UFIELD_CATEGORY_UNDEFINED = 0,

    /**
     * For fields in UDateFormatField (udat.h), from ICU 3.0.
     *
     * @draft ICU 64
     */
    UFIELD_CATEGORY_DATE,

    /**
     * For fields in UNumberFormatFields (unum.h), from ICU 49.
     *
     * @draft ICU 64
     */
    UFIELD_CATEGORY_NUMBER,

    /**
     * For fields in UListFormatterField (ulistformatter.h), from ICU 63.
     *
     * @draft ICU 64
     */
    UFIELD_CATEGORY_LIST,

    /**
     * For fields in URelativeDateTimeFormatterField (ureldatefmt.h), from ICU 64.
     *
     * @draft ICU 64
     */
    UFIELD_CATEGORY_RELATIVE_DATETIME,

    /**
     * Reserved for possible future fields in UDateIntervalFormatField.
     *
     * @internal
     */
    UFIELD_CATEGORY_DATE_INTERVAL,

#ifndef U_HIDE_INTERNAL_API
    /** @internal */
    UFIELD_CATEGORY_COUNT,
#endif  /* U_HIDE_INTERNAL_API */

    /**
     * Category for spans in a list.
     *
     * @draft ICU 64
     */
    UFIELD_CATEGORY_LIST_SPAN = 0x1000 + UFIELD_CATEGORY_LIST,

    /**
     * Category for spans in a date interval.
     *
     * @draft ICU 64
     */
    UFIELD_CATEGORY_DATE_INTERVAL_SPAN = 0x1000 + UFIELD_CATEGORY_DATE_INTERVAL,

} UFieldCategory;


struct UConstrainedFieldPosition;
/**
 * Represents a span of a string containing a given field.
 *
 * This struct differs from UFieldPosition in the following ways:
 *
 *   1. It has information on the field category.
 *   2. It allows you to set constraints to use when iterating over field positions.
 *   3. It is used for the newer FormattedValue APIs.
 *
 * @draft ICU 64
 */
typedef struct UConstrainedFieldPosition UConstrainedFieldPosition;


/**
 * Creates a new UConstrainedFieldPosition.
 *
 * By default, the UConstrainedFieldPosition has no iteration constraints.
 *
 * @param ec Set if an error occurs.
 * @return The new object, or NULL if an error occurs.
 * @draft ICU 64
 */
U_DRAFT UConstrainedFieldPosition* U_EXPORT2
ucfpos_open(UErrorCode* ec);


/**
 * Resets a UConstrainedFieldPosition to its initial state, as if it were newly created.
 *
 * Removes any constraints that may have been set on the instance.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_reset(
    UConstrainedFieldPosition* ucfpos,
    UErrorCode* ec);


/**
 * Destroys a UConstrainedFieldPosition and releases its memory.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_close(UConstrainedFieldPosition* ucfpos);


/**
 * Sets a constraint on the field category.
 * 
 * When this instance of UConstrainedFieldPosition is passed to ufmtval_nextPosition,
 * positions are skipped unless they have the given category.
 *
 * Any previously set constraints are cleared.
 *
 * For example, to loop over only the number-related fields:
 *
 *     UConstrainedFieldPosition* ucfpos = ucfpos_open(ec);
 *     ucfpos_constrainCategory(ucfpos, UFIELDCATEGORY_NUMBER_FORMAT, ec);
 *     while (ufmtval_nextPosition(ufmtval, ucfpos, ec)) {
 *         // handle the number-related field position
 *     }
 *     ucfpos_close(ucfpos);
 *
 * Changing the constraint while in the middle of iterating over a FormattedValue
 * does not generally have well-defined behavior.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param category The field category to fix when iterating.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_constrainCategory(
    UConstrainedFieldPosition* ucfpos,
    int32_t category,
    UErrorCode* ec);


/**
 * Sets a constraint on the category and field.
 * 
 * When this instance of UConstrainedFieldPosition is passed to ufmtval_nextPosition,
 * positions are skipped unless they have the given category and field.
 *
 * Any previously set constraints are cleared.
 *
 * For example, to loop over all grouping separators:
 *
 *     UConstrainedFieldPosition* ucfpos = ucfpos_open(ec);
 *     ucfpos_constrainField(ucfpos, UFIELDCATEGORY_NUMBER_FORMAT, UNUM_GROUPING_SEPARATOR_FIELD, ec);
 *     while (ufmtval_nextPosition(ufmtval, ucfpos, ec)) {
 *         // handle the grouping separator position
 *     }
 *     ucfpos_close(ucfpos);
 *
 * Changing the constraint while in the middle of iterating over a FormattedValue
 * does not generally have well-defined behavior.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param category The field category to fix when iterating.
 * @param field The field to fix when iterating.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_constrainField(
    UConstrainedFieldPosition* ucfpos,
    int32_t category,
    int32_t field,
    UErrorCode* ec);


/**
 * Gets the field category for the current position.
 *
 * If a category or field constraint was set, this function returns the constrained
 * category. Otherwise, the return value is well-defined only after
 * ufmtval_nextPosition returns TRUE.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param ec Set if an error occurs.
 * @return The field category saved in the instance.
 * @draft ICU 64
 */
U_DRAFT int32_t U_EXPORT2
ucfpos_getCategory(
    const UConstrainedFieldPosition* ucfpos,
    UErrorCode* ec);


/**
 * Gets the field for the current position.
 *
 * If a field constraint was set, this function returns the constrained
 * field. Otherwise, the return value is well-defined only after
 * ufmtval_nextPosition returns TRUE.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param ec Set if an error occurs.
 * @return The field saved in the instance.
 * @draft ICU 64
 */
U_DRAFT int32_t U_EXPORT2
ucfpos_getField(
    const UConstrainedFieldPosition* ucfpos,
    UErrorCode* ec);


/**
 * Gets the INCLUSIVE start and EXCLUSIVE end index stored for the current position.
 *
 * The output values are well-defined only after ufmtval_nextPosition returns TRUE.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param pStart Set to the start index saved in the instance. Ignored if nullptr.
 * @param pLimit Set to the end index saved in the instance. Ignored if nullptr.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_getIndexes(
    const UConstrainedFieldPosition* ucfpos,
    int32_t* pStart,
    int32_t* pLimit,
    UErrorCode* ec);


/**
 * Gets an int64 that FormattedValue implementations may use for storage.
 *
 * The initial value is zero.
 *
 * Users of FormattedValue should not need to call this method.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param ec Set if an error occurs.
 * @return The current iteration context from ucfpos_setInt64IterationContext.
 * @draft ICU 64
 */
U_DRAFT int64_t U_EXPORT2
ucfpos_getInt64IterationContext(
    const UConstrainedFieldPosition* ucfpos,
    UErrorCode* ec);


/**
 * Sets an int64 that FormattedValue implementations may use for storage.
 *
 * Intended to be used by FormattedValue implementations.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param context The new iteration context.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_setInt64IterationContext(
    UConstrainedFieldPosition* ucfpos,
    int64_t context,
    UErrorCode* ec);


/**
 * Determines whether a given field should be included given the
 * constraints.
 *
 * Intended to be used by FormattedValue implementations.
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param category The category to test.
 * @param field The field to test.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT UBool U_EXPORT2
ucfpos_matchesField(
    const UConstrainedFieldPosition* ucfpos,
    int32_t category,
    int32_t field,
    UErrorCode* ec);


/**
 * Sets new values for the primary public getters.
 *
 * Intended to be used by FormattedValue implementations.
 *
 * It is up to the implementation to ensure that the user-requested
 * constraints are satisfied. This method does not check!
 *
 * @param ucfpos The instance of UConstrainedFieldPosition.
 * @param category The new field category.
 * @param field The new field.
 * @param start The new inclusive start index.
 * @param limit The new exclusive end index.
 * @param ec Set if an error occurs.
 * @draft ICU 64
 */
U_DRAFT void U_EXPORT2
ucfpos_setState(
    UConstrainedFieldPosition* ucfpos,
    int32_t category,
    int32_t field,
    int32_t start,
    int32_t limit,
    UErrorCode* ec);


struct UFormattedValue;
/**
 * An abstract formatted value: a string with associated field attributes.
 * Many formatters format to types compatible with UFormattedValue.
 *
 * @draft ICU 64
 */
typedef struct UFormattedValue UFormattedValue;


/**
 * Returns a pointer to the formatted string. The pointer is owned by the UFormattedValue. The
 * return value is valid only as long as the UFormattedValue is present and unchanged in memory.
 *
 * The return value is NUL-terminated but could contain internal NULs.
 *
 * @param ufmtval
 *         The object containing the formatted string and attributes.
 * @param pLength Output variable for the length of the string. Ignored if NULL.
 * @param ec Set if an error occurs.
 * @return A NUL-terminated char16 string owned by the UFormattedValue.
 * @draft ICU 64
 */
U_DRAFT const UChar* U_EXPORT2
ufmtval_getString(
    const UFormattedValue* ufmtval,
    int32_t* pLength,
    UErrorCode* ec);


/**
 * Iterates over field positions in the UFormattedValue. This lets you determine the position
 * of specific types of substrings, like a month or a decimal separator.
 *
 * To loop over all field positions:
 *
 *     UConstrainedFieldPosition* ucfpos = ucfpos_open(ec);
 *     while (ufmtval_nextPosition(ufmtval, ucfpos, ec)) {
 *         // handle the field position; get information from ucfpos
 *     }
 *     ucfpos_close(ucfpos);
 *
 * @param ufmtval
 *         The object containing the formatted string and attributes.
 * @param ucfpos
 *         The object used for iteration state; can provide constraints to iterate over only
 *         one specific category or field;
 *         see ucfpos_constrainCategory
 *         and ucfpos_constrainField.
 * @param ec Set if an error occurs.
 * @return TRUE if another position was found; FALSE otherwise.
 * @draft ICU 64
 */
U_DRAFT UBool U_EXPORT2
ufmtval_nextPosition(
    const UFormattedValue* ufmtval,
    UConstrainedFieldPosition* ucfpos,
    UErrorCode* ec);


#if U_SHOW_CPLUSPLUS_API
U_NAMESPACE_BEGIN

/**
 * \class LocalUConstrainedFieldPositionPointer
 * "Smart pointer" class; closes a UConstrainedFieldPosition via ucfpos_close().
 * For most methods see the LocalPointerBase base class.
 *
 * Usage:
 *
 *     LocalUConstrainedFieldPositionPointer ucfpos(ucfpos_open(ec));
 *     // no need to explicitly call ucfpos_close()
 *
 * @draft ICU 64
 */
U_DEFINE_LOCAL_OPEN_POINTER(LocalUConstrainedFieldPositionPointer,
    UConstrainedFieldPosition,
    ucfpos_close);

U_NAMESPACE_END
#endif // U_SHOW_CPLUSPLUS_API


#endif  /* U_HIDE_DRAFT_API */
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // __UFORMATTEDVALUE_H__