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Add an ICU API for formatting a number into constituent parts (sign, integer, grouping separator, decimal, fraction, &c.) for use in implementing Intl.NumberFormat.prototype.formatToParts.
https://ssl.icu-project.org/trac/ticket/12684
diff --git a/intl/icu/source/i18n/unicode/unum.h b/intl/icu/source/i18n/unicode/unum.h
--- a/intl/icu/source/i18n/unicode/unum.h
+++ b/intl/icu/source/i18n/unicode/unum.h
@@ -20,16 +20,17 @@
#include "unicode/localpointer.h"
#include "unicode/uloc.h"
#include "unicode/ucurr.h"
#include "unicode/umisc.h"
#include "unicode/parseerr.h"
#include "unicode/uformattable.h"
#include "unicode/udisplaycontext.h"
+#include "unicode/ufieldpositer.h"
/**
* \file
* \brief C API: NumberFormat
*
* <h2> Number Format C API </h2>
*
* Number Format C API Provides functions for
@@ -647,16 +648,66 @@ U_STABLE int32_t U_EXPORT2
unum_formatUFormattable(const UNumberFormat* fmt,
const UFormattable *number,
UChar *result,
int32_t resultLength,
UFieldPosition *pos,
UErrorCode *status);
/**
+* Format a double using a UNumberFormat according to the UNumberFormat's locale,
+* and initialize a UFieldPositionIterator that enumerates the subcomponents of
+* the resulting string.
+*
+* @param format
+* The formatter to use.
+* @param number
+* The number to format.
+* @param result
+* A pointer to a buffer to receive the NULL-terminated formatted
+* number. If the formatted number fits into dest but cannot be
+* NULL-terminated (length == resultLength) then the error code is set
+* to U_STRING_NOT_TERMINATED_WARNING. If the formatted number doesn't
+* fit into result then the error code is set to
+* U_BUFFER_OVERFLOW_ERROR.
+* @param resultLength
+* The maximum size of result.
+* @param fpositer
+* A pointer to a UFieldPositionIterator created by {@link #ufieldpositer_open}
+* (may be NULL if field position information is not needed, but in this
+* case it's preferable to use {@link #unum_formatDouble}). Iteration
+* information already present in the UFieldPositionIterator is deleted,
+* and the iterator is reset to apply to the fields in the formatted
+* string created by this function call. The field values and indexes
+* returned by {@link #ufieldpositer_next} represent fields denoted by
+* the UNumberFormatFields enum. Fields are not returned in a guaranteed
+* order. Fields cannot overlap, but they may nest. For example, 1234
+* could format as "1,234" which might consist of a grouping separator
+* field for ',' and an integer field encompassing the entire string.
+* @param status
+* A pointer to an UErrorCode to receive any errors
+* @return
+* The total buffer size needed; if greater than resultLength, the
+* output was truncated.
+* @see unum_formatDouble
+* @see unum_parse
+* @see unum_parseDouble
+* @see UFieldPositionIterator
+* @see UNumberFormatFields
+* @stable ICU 59
+*/
+U_STABLE int32_t U_EXPORT2
+unum_formatDoubleForFields(const UNumberFormat* format,
+ double number,
+ UChar* result,
+ int32_t resultLength,
+ UFieldPositionIterator* fpositer,
+ UErrorCode* status);
+
+/**
* Parse a string into an integer using a UNumberFormat.
* The string will be parsed according to the UNumberFormat's locale.
* Note: parsing is not supported for styles UNUM_DECIMAL_COMPACT_SHORT
* and UNUM_DECIMAL_COMPACT_LONG.
* @param fmt The formatter to use.
* @param text The text to parse.
* @param textLength The length of text, or -1 if null-terminated.
* @param parsePos If not NULL, on input a pointer to an integer specifying the offset at which
diff --git a/intl/icu/source/i18n/unum.cpp b/intl/icu/source/i18n/unum.cpp
--- a/intl/icu/source/i18n/unum.cpp
+++ b/intl/icu/source/i18n/unum.cpp
@@ -870,9 +870,37 @@ unum_formatUFormattable(const UNumberFor
if(pos != 0) {
pos->beginIndex = fp.getBeginIndex();
pos->endIndex = fp.getEndIndex();
}
return res.extract(result, resultLength, *status);
}
+U_CAPI int32_t U_EXPORT2
+unum_formatDoubleForFields(const UNumberFormat* format,
+ double number,
+ UChar* result,
+ int32_t resultLength,
+ UFieldPositionIterator* fpositer,
+ UErrorCode* status)
+{
+ if (U_FAILURE(*status))
+ return -1;
+
+ if (result == NULL ? resultLength != 0 : resultLength < 0) {
+ *status = U_ILLEGAL_ARGUMENT_ERROR;
+ return -1;
+ }
+
+ UnicodeString res;
+ if (result != NULL) {
+ // NULL destination for pure preflighting: empty dummy string
+ // otherwise, alias the destination buffer
+ res.setTo(result, 0, resultLength);
+ }
+
+ ((const NumberFormat*)format)->format(number, res, (FieldPositionIterator*)fpositer, *status);
+
+ return res.extract(result, resultLength, *status);
+}
+
#endif /* #if !UCONFIG_NO_FORMATTING */
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