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ICU-2895 Relative Date Format

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X-SVN-Rev: 21382
This commit is contained in:
Steven R. Loomis 2007-04-09 22:54:03 +00:00
parent d48f7af250
commit 5d4f7e2492
3 changed files with 519 additions and 0 deletions

2
.gitattributes vendored
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@ -82,6 +82,8 @@ icu4c/source/data/mappings/ibm-964_P110_P100-1999.ucm -text
icu4c/source/data/mappings/ibm-970_P110_P110-2006.ucm -text
icu4c/source/i18n/persncal.cpp -text
icu4c/source/i18n/persncal.h -text
icu4c/source/i18n/reldtfmt.cpp -text
icu4c/source/i18n/reldtfmt.h -text
icu4c/source/samples/ucnv/data02.bin -text
icu4c/source/test/perf/charperf/CharPerf_r.pl -text
icu4c/source/test/perf/convperf/ConvPerf_r.pl -text

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icu4c/source/i18n/reldtfmt.cpp Normal file
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/*
*******************************************************************************
* Copyright (C) 2007, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
//#define DEBUG_RELDTFMT
#include <stdio.h>
#include <stdlib.h>
#include "reldtfmt.h"
#include "unicode/msgfmt.h"
#include "gregoimp.h" // for CalendarData
U_NAMESPACE_BEGIN
/**
* An array of URelativeString structs is used to store the resource data loaded out of the bundle.
*/
struct URelativeString {
int32_t offset; /** offset of this item, such as, the relative date **/
const UChar* string; /** string, or NULL if not set **/
int32_t len; /** length of the string **/
};
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RelativeDateFormat)
RelativeDateFormat::RelativeDateFormat(const RelativeDateFormat& other) :
DateFormat(other),fCalData(NULL), fStrings(NULL), dates(NULL), datesLen(0), fCombinedFormat(NULL) {
dateStyle = other.dateStyle;
timeStyle = other.timeStyle;
if(other.fDateFormat != NULL) {
fDateFormat = (DateFormat*)other.fDateFormat->clone();
} else {
fDateFormat = NULL;
}
if(other.fTimeFormat != NULL) {
fTimeFormat = (DateFormat*)other.fTimeFormat->clone();
} else {
fTimeFormat = NULL;
}
}
RelativeDateFormat::RelativeDateFormat( UDateFormatStyle timeStyle, UDateFormatStyle dateStyle, const Locale& locale, UErrorCode& status)
: dateStyle(dateStyle), timeStyle(timeStyle), fDateFormat(NULL), fCombinedFormat(NULL), fTimeFormat(NULL),
locale(locale),fCalData(NULL), fStrings(NULL), dates(NULL), datesLen(0) {
if(U_FAILURE(status) ) {
return;
}
if(dateStyle != UDAT_NONE) {
EStyle newStyle = (EStyle)(dateStyle & ~UDAT_RELATIVE);
// Create a DateFormat in the non-relative style requested.
fDateFormat = createDateInstance(newStyle, locale);
}
if(timeStyle != UDAT_NONE) {
// don't support time style, for now
status = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
// Initialize the parent fCalendar, so that parse() works correctly.
initializeCalendar(NULL, locale, status);
}
RelativeDateFormat::~RelativeDateFormat() {
delete fDateFormat;
delete fTimeFormat;
delete fCombinedFormat;
delete [] dates;
// do NOT: delete fStrings - as they are loaded from mapped memory, all owned by fCalData.
delete fCalData;
}
Format* RelativeDateFormat::clone(void) const {
RelativeDateFormat *other = new RelativeDateFormat(*this);
return other;
}
UBool RelativeDateFormat::operator==(const Format& other) const {
if(DateFormat::operator==(other)) {
// DateFormat::operator== guarantees following cast is safe
RelativeDateFormat* that = (RelativeDateFormat*)&other;
return (dateStyle==that->dateStyle &&
timeStyle==that->timeStyle &&
locale==that->locale);
}
return FALSE;
}
UnicodeString& RelativeDateFormat::format( Calendar& cal,
UnicodeString& appendTo,
FieldPosition& pos) const {
UErrorCode status = U_ZERO_ERROR;
// calculate the difference, in days, between 'cal' and now.
int dayDiff = dayDifference(cal, status);
// look up string
int32_t len;
const UChar *theString = getStringForDay(dayDiff, len, status);
if(U_FAILURE(status) || (theString==NULL)) {
// didn't find it. Fall through to the fDateFormat
if(fDateFormat != NULL) {
return fDateFormat->format(cal,appendTo,pos);
} else {
return appendTo; // no op
}
} else {
// found a relative string
return appendTo.append(theString, len);
}
}
void RelativeDateFormat::parse( const UnicodeString& text,
Calendar& cal,
ParsePosition& pos) const {
// Can the fDateFormat parse it?
if(fDateFormat != NULL) {
ParsePosition aPos(pos);
fDateFormat->parse(text,cal,aPos);
if((aPos.getIndex() != pos.getIndex()) &&
(aPos.getErrorIndex()==-1)) {
pos=aPos; // copy the sub parse
return; // parsed subfmt OK
}
}
// Linear search the relative strings
for(int n=0;n<datesLen;n++) {
if(dates[n].string != NULL &&
(0==text.compare(pos.getIndex(),
dates[n].len,
dates[n].string))) {
UErrorCode status = U_ZERO_ERROR;
// Set the calendar to now+offset
cal.setTime(Calendar::getNow(),status);
cal.add(UCAL_DATE,dates[n].offset, status);
if(U_FAILURE(status)) {
// failure in setting calendar fields
pos.setErrorIndex(pos.getIndex()+dates[n].len);
} else {
pos.setIndex(pos.getIndex()+dates[n].len);
}
return;
}
}
// parse failed
}
UResourceBundle *RelativeDateFormat::getStrings(UErrorCode& status) const {
if(fCalData == NULL) {
// fCalData owns the subsequent strings
((RelativeDateFormat*)this)->fCalData = new CalendarData(locale, "gregorian", status);
}
if(fStrings == NULL) {
// load the string object
UResourceBundle *theStrings = fCalData->getByKey3("fields", "day", "relative", status);
if (U_FAILURE(status)) {
return NULL;
}
((RelativeDateFormat*)this)->fStrings = theStrings; // cast away const
}
return fStrings;
}
const UChar *RelativeDateFormat::getStringForDay(int32_t day, int32_t &len, UErrorCode &status) const {
if(U_FAILURE(status)) {
return NULL;
}
if(dates == NULL) {
loadDates(status);
if(U_FAILURE(status)) {
return NULL;
}
}
// no strings.
if(datesLen == 0) {
return NULL;
}
// Is it outside the resource bundle's range?
if(day < dayMin || day > dayMax) {
return NULL; // don't have it.
}
// Linear search the held strings
for(int n=0;n<datesLen;n++) {
if(dates[n].offset == day) {
len = dates[n].len;
return dates[n].string;
}
}
return NULL; // not found.
}
void RelativeDateFormat::loadDates(UErrorCode &status) const {
UResourceBundle *strings = getStrings(status);
RelativeDateFormat *nonConstThis = ((RelativeDateFormat*)this); // cast away const.
// set up min/max
nonConstThis->dayMin=-1;
nonConstThis->dayMax=1;
if(U_FAILURE(status)) {
nonConstThis->datesLen=0;
return;
}
nonConstThis->datesLen = ures_getSize(strings);
nonConstThis->dates = new URelativeString[datesLen];
// Load in each item into the array...
int n = 0;
UResourceBundle *subString = NULL;
while(ures_hasNext(strings) && U_SUCCESS(status)) { // iterate over items
subString = ures_getNextResource(strings, subString, &status);
if(U_FAILURE(status) || (subString==NULL)) break;
// key = offset #
const char *key = ures_getKey(subString);
// load the string and length
int32_t aLen;
const UChar* aString = ures_getString(subString, &aLen, &status);
if(U_FAILURE(status) || aString == NULL) break;
// calculate the offset
int32_t offset = atoi(key);
// set min/max
if(offset < dayMin) {
nonConstThis->dayMin = offset;
}
if(offset > dayMax) {
nonConstThis->dayMax = offset;
}
// copy the string pointer
nonConstThis->dates[n].offset = offset;
nonConstThis->dates[n].string = aString;
nonConstThis->dates[n].len = aLen;
n++;
}
// the dates[] array could be sorted here, for direct access.
}
// this should to be in DateFormat, instead it was copied from SimpleDateFormat.
Calendar*
RelativeDateFormat::initializeCalendar(TimeZone* adoptZone, const Locale& locale, UErrorCode& status)
{
if(!U_FAILURE(status)) {
fCalendar = Calendar::createInstance(adoptZone?adoptZone:TimeZone::createDefault(), locale, status);
}
if (U_SUCCESS(status) && fCalendar == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return fCalendar;
}
int32_t RelativeDateFormat::dayDifference(Calendar &cal, UErrorCode &status) {
if(U_FAILURE(status)) {
return 0;
}
// TODO: Cache the nowCal to avoid heap allocs?
Calendar *nowCal = cal.clone();
nowCal->setTime(Calendar::getNow(), status);
int32_t dayDiff = nowCal->fieldDifference(cal.getTime(status), Calendar::DATE, status);
delete nowCal;
return dayDiff;
}
U_NAMESPACE_END
#endif

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icu4c/source/i18n/reldtfmt.h Normal file
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/*
*******************************************************************************
* Copyright (C) 2007, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
#ifndef RELDTFMT_H
#define RELDTFMT_H
#include "unicode/utypes.h"
/**
* \file
* \brief C++ API: Format and parse relative dates and times.
*/
#if !UCONFIG_NO_FORMATTING
#include "unicode/datefmt.h"
U_NAMESPACE_BEGIN
// forward declarations
class CalendarData;
class MessageFormat;
// internal structure used for caching strings
struct URelativeString;
/**
* This class is normally accessed using the kRelative or k...Relative values of EStyle as parameters to DateFormat::createDateInstance.
*
* Example:
* DateFormat *fullrelative = DateFormat::createDateInstance(DateFormat::kFullRelative, loc);
*
* @draft ICU 3.8
*/
class U_I18N_API RelativeDateFormat : public DateFormat {
public:
RelativeDateFormat( UDateFormatStyle timeStyle, UDateFormatStyle dateStyle, const Locale& locale, UErrorCode& status);
// overrides
/**
* Copy constructor.
* @draft ICU 3.8
*/
RelativeDateFormat(const RelativeDateFormat&);
/**
* Assignment operator.
* @draft ICU 3.8
*/
RelativeDateFormat& operator=(const RelativeDateFormat&);
/**
* Destructor.
* @draft ICU 3.8
*/
virtual ~RelativeDateFormat();
/**
* Clone this Format object polymorphically. The caller owns the result and
* should delete it when done.
* @return A copy of the object.
* @draft ICU 3.8
*/
virtual Format* clone(void) const;
/**
* Return true if the given Format objects are semantically equal. Objects
* of different subclasses are considered unequal.
* @param other the object to be compared with.
* @return true if the given Format objects are semantically equal.
* @draft ICU 3.8
*/
virtual UBool operator==(const Format& other) const;
/**
* Format a date or time, which is the standard millis since 24:00 GMT, Jan
* 1, 1970. Overrides DateFormat pure virtual method.
* <P>
* Example: using the US locale: "yyyy.MM.dd e 'at' HH:mm:ss zzz" ->>
* 1996.07.10 AD at 15:08:56 PDT
*
* @param cal Calendar set to the date and time to be formatted
* into a date/time string.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param pos The formatting position. On input: an alignment field,
* if desired. On output: the offsets of the alignment field.
* @return Reference to 'appendTo' parameter.
* @draft ICU 3.8
*/
virtual UnicodeString& format( Calendar& cal,
UnicodeString& appendTo,
FieldPosition& pos) const;
/**
* Parse a date/time string beginning at the given parse position. For
* example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
* that is equivalent to Date(837039928046).
* <P>
* By default, parsing is lenient: If the input is not in the form used by
* this object's format method but can still be parsed as a date, then the
* parse succeeds. Clients may insist on strict adherence to the format by
* calling setLenient(false).
*
* @param text The date/time string to be parsed
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string.
* @param pos On input, the position at which to start parsing; on
* output, the position at which parsing terminated, or the
* start position if the parse failed.
* @return A valid UDate if the input could be parsed.
* @draft ICU 3.8
*/
virtual void parse( const UnicodeString& text,
Calendar& cal,
ParsePosition& pos) const;
private:
DateFormat *fDateFormat; // the held date format
DateFormat *fTimeFormat; // the held time format
MessageFormat *fCombinedFormat; // the {0} {1} format.
UDateFormatStyle dateStyle;
UDateFormatStyle timeStyle;
Locale locale;
CalendarData *fCalData; // holds a reference to the resource data
UResourceBundle *fStrings; // the array of strings
int32_t dayMin; // day id of lowest #
int32_t dayMax; // day id of highest #
int32_t datesLen; // Length of array
URelativeString *dates; // array of strings
/**
* Get the string at a specific offset.
* @param day day offset ( -1, 0, 1, etc.. )
* @param len on output, length of string.
* @return the string, or NULL if none at that location.
*/
const UChar *getStringForDay(int32_t day, int32_t &len, UErrorCode &status) const;
/**
* Load the Date string array
*/
void loadDates(UErrorCode &status) const;
/**
* Load the Strings resource needed for relative dates. Returns an error and null if it could not be loaded.
* Semantic const.
*/
UResourceBundle *getStrings(UErrorCode &status) const;
/**
* @return the number of days in "until-now"
*/
static int32_t dayDifference(Calendar &until, UErrorCode &status);
/**
* initializes fCalendar from parameters. Returns fCalendar as a convenience.
* @param adoptZone Zone to be adopted, or NULL for TimeZone::createDefault().
* @param locale Locale of the calendar
* @param status Error code
* @return the newly constructed fCalendar
* @draft ICU 3.8
*/
Calendar* initializeCalendar(TimeZone* adoptZone, const Locale& locale, UErrorCode& status);
public:
/**
* Return the class ID for this class. This is useful only for comparing to
* a return value from getDynamicClassID(). For example:
* <pre>
* . Base* polymorphic_pointer = createPolymorphicObject();
* . if (polymorphic_pointer->getDynamicClassID() ==
* . erived::getStaticClassID()) ...
* </pre>
* @return The class ID for all objects of this class.
* @draft ICU 3.8
*/
static UClassID U_EXPORT2 getStaticClassID(void);
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
* method is to implement a simple version of RTTI, since not all C++
* compilers support genuine RTTI. Polymorphic operator==() and clone()
* methods call this method.
*
* @return The class ID for this object. All objects of a
* given class have the same class ID. Objects of
* other classes have different class IDs.
* @draft ICU 3.8
*/
virtual UClassID getDynamicClassID(void) const;
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // RELDTFMT_H
//eof