Proposal: add IntlDateTimePatternGenerator

5 years ago by Mel Dafert — view source — reply

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Hello Internals,

I would like to propose an addition to the intl extension, IntlDateTimePatternGenerator.
ICU exposes the DateTimePatternGenerator class that allows generating a formatting pattern from a given "skeleton" for a given locale. (see https://unicode-org.github.io/icu-docs/apidoc/dev/icu4c/classicu_1_1DateTimePatternGenerator.html)
This allows more flexibility than the current $format argument of IntlDateFormatter::format(), which takes either a few pre-defined constants or a hard-coded format.
This functionality also has been requested in the past. (see https://bugs.php.net/bug.php?id=70377)

For example, if an application requires a format that will always use the long version of a year, but the short version of a month (eg. "MM/dd/YYYY" for "en_US", or "dd.MM.YYYY" for "de_DE"), one is out of luck.
IntlDateFormatter::SHORT will use the short year for "de_DE" ("dd.MM.YY"), and IntlDateFormatter::MEDIUM will use the long version of a month for "en_US" ("MMM dd, YYYY").

With IntlDateTimePatternGenerator::getBestPattern(), a skeleton can be provided to generate the appropriate pattern for a given locale.
In the use-case given above, the skeleton "YYYYMMdd" will generate the desired patterns for each locale, which can then be passed to IntlDateFormatter::format().

Proposed Signature:

class IntlDateTimePatternGenerator
{
    public function __construct(?string $locale = null) {}

    public static function create(?string $locale = null): ?IntlDateTimePatternGenerator {}

    public function getBestPattern(string $skeleton): string|false {}
}

Example use-case:

$date = new \DateTime();
$skeleton = "YYYYMMdd";
$dtpg = new \IntlDateTimePatternGenerator(); // uses default locale if not specified
$format = $dtpg->getBestPattern($skeleton);

echo \IntlDateFormatter::formatObject($date, $format); // outputs "28.03.2020" for "de_DE" locale

The proposed implementation can be found here: https://github.com/php/php-src/pull/6771
I assume that this will require an RFC, in which case I request the karma to create one. My wiki account is deltragon.

Regards,
Mel Dafert

5 years ago by kocsismate90@gmail.com — view source — reply

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Hi Mel,

Thank you very much for working on this! I was bitten by lack of this
functionality a few years ago, and I couldn't find any (good) alternative.
Thus, I'm looking forward to having IntlDateTimePatternGenerator in
ext/intl.

I think it could be mentioned for those who don't open the bug report that
HHVM implemented this class long ago:
https://github.com/facebook/hhvm/commit/bc84daf7816e4cd268da59d535dcadfc6cf01085

Now that I see their implementation again, I'm wondering
if IntlDateTimePatternGenerator is the right name, or we should also use
IntlDatePatternGenerator, which is more in line with ``IntlDateFormatter`.

Regards:
Máté

Mel Dafert mel@dafert.at ezt írta (időpont: 2021. márc. 28., V, 16:54):

Hello Internals,

I would like to propose an addition to the intl extension,
IntlDateTimePatternGenerator.
ICU exposes the DateTimePatternGenerator class that allows generating a
formatting pattern from a given "skeleton" for a given locale. (see
https://unicode-org.github.io/icu-docs/apidoc/dev/icu4c/classicu_1_1DateTimePatternGenerator.html
)
This allows more flexibility than the current $format argument of
IntlDateFormatter::format(), which takes either a few pre-defined constants
or a hard-coded format.
This functionality also has been requested in the past. (see
https://bugs.php.net/bug.php?id=70377)

For example, if an application requires a format that will always use the
long version of a year, but the short version of a month (eg. "MM/dd/YYYY"
for "en_US", or "dd.MM.YYYY" for "de_DE"), one is out of luck.
IntlDateFormatter::SHORT will use the short year for "de_DE" ("dd.MM.YY"),
and IntlDateFormatter::MEDIUM will use the long version of a month for
"en_US" ("MMM dd, YYYY").

With IntlDateTimePatternGenerator::getBestPattern(), a skeleton can be
provided to generate the appropriate pattern for a given locale.
In the use-case given above, the skeleton "YYYYMMdd" will generate the
desired patterns for each locale, which can then be passed to
IntlDateFormatter::format().

Proposed Signature:
class IntlDateTimePatternGenerator
{
    public function __construct(?string $locale = null) {}

    public static function create(?string $locale = null):
?IntlDateTimePatternGenerator {}

    public function getBestPattern(string $skeleton): string|false {}
}
Example use-case:
$date = new \DateTime();
$skeleton = "YYYYMMdd";
$dtpg = new \IntlDateTimePatternGenerator(); // uses default locale if not
specified
$format = $dtpg->getBestPattern($skeleton);

echo \IntlDateFormatter::formatObject($date, $format); // outputs
"28.03.2020" for "de_DE" locale
The proposed implementation can be found here:
https://github.com/php/php-src/pull/6771
I assume that this will require an RFC, in which case I request the karma
to create one. My wiki account is deltragon.

Regards,
Mel Dafert

--

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5 years ago by Mel Dafert — view source — reply

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Now that I see their implementation again, I'm wondering if IntlDateTimePatternGenerator is the right name, or we should also use IntlDatePatternGenerator, which is more in line with IntlDateFormatter.

I was also wondering about that. I ended up going for IntlDateTimePatternGenerator, because ICU has that same inconsistency (icu::DateFormat and icu::DateTimePatternGenerator). I think the big argument here is discoverability - if someone is wondering about whether PHP exposes the feature from ICU, it might be harder to find it if we name it differently (and vice versa).

From: "Máté Kocsis" kocsismate90@gmail.com
To: "Mel Dafert" mel@dafert.at
Cc: "internals" internals@lists.php.net
Sent: Sunday, March 28, 2021 7:45:46 PM
Subject: Re: [PHP-DEV] Proposal: add IntlDateTimePatternGenerator

Hi Mel,
Thank you very much for working on this! I was bitten by lack of this functionality a few years ago, and I couldn't find any (good) alternative. Thus, I'm looking forward to having IntlDateTimePatternGenerator in ext/intl.

I think it could be mentioned for those who don't open the bug report that HHVM implemented this class long ago: [ https://github.com/facebook/hhvm/commit/bc84daf7816e4cd268da59d535dcadfc6cf01085 | https://github.com/facebook/hhvm/commit/bc84daf7816e4cd268da59d535dcadfc6cf01085 ]

Now that I see their implementation again, I'm wondering if IntlDateTimePatternGenerator is the right name, or we should also use IntlDatePatternGenerator, which is more in line with ``IntlDateFormatter`.

Regards:
Máté

Mel Dafert < [ mailto:mel@dafert.at | mel@dafert.at ] > ezt írta (időpont: 2021. márc. 28., V, 16:54):

BQ_BEGIN
Hello Internals,

I would like to propose an addition to the intl extension, IntlDateTimePatternGenerator.
ICU exposes the DateTimePatternGenerator class that allows generating a formatting pattern from a given "skeleton" for a given locale. (see [ https://unicode-org.github.io/icu-docs/apidoc/dev/icu4c/classicu_1_1DateTimePatternGenerator.html | https://unicode-org.github.io/icu-docs/apidoc/dev/icu4c/classicu_1_1DateTimePatternGenerator.html ] )
This allows more flexibility than the current $format argument of IntlDateFormatter::format(), which takes either a few pre-defined constants or a hard-coded format.
This functionality also has been requested in the past. (see [ https://bugs.php.net/bug.php?id=70377 | https://bugs.php.net/bug.php?id=70377 ] )

Proposed Signature:

class IntlDateTimePatternGenerator 
{ 
public function __construct(?string $locale = null) {} 

public static function create(?string $locale = null): ?IntlDateTimePatternGenerator {} 

public function getBestPattern(string $skeleton): string|false {} 
}

Example use-case:

$date = new \DateTime(); 
$skeleton = "YYYYMMdd"; 
$dtpg = new \IntlDateTimePatternGenerator(); // uses default locale if not specified 
$format = $dtpg->getBestPattern($skeleton); 

echo \IntlDateFormatter::formatObject($date, $format); // outputs "28.03.2020" for "de_DE" locale

The proposed implementation can be found here: [ https://github.com/php/php-src/pull/6771 | https://github.com/php/php-src/pull/6771 ]
I assume that this will require an RFC, in which case I request the karma to create one. My wiki account is deltragon.

Regards,
Mel Dafert

To unsubscribe, visit: [ https://www.php.net/unsub.php | https://www.php.net/unsub.php ]

BQ_END

5 years ago by Mel Dafert — view source — reply

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Now that I see their implementation again, I'm wondering if IntlDateTimePatternGenerator is the right name, or we should also use IntlDatePatternGenerator, which is more in line with IntlDateFormatter.

I was also wondering about that. I ended up going for IntlDateTimePatternGenerator, because ICU has that same inconsistency
(icu::DateFormat and icu::DateTimePatternGenerator).
I think the big argument here is discoverability - if someone is wondering about whether PHP exposes the feature from ICU, it might be harder
to find it if we name it differently (and vice versa).

PS: Sorry about the duplicate/badly formatted message - I am new to the concept of mailing lists.

----- Original Message -----
From: "Máté Kocsis" kocsismate90@gmail.com
To: "Mel Dafert" mel@dafert.at
Cc: "internals" internals@lists.php.net
Sent: Sunday, March 28, 2021 7:45:46 PM
Subject: Re: [PHP-DEV] Proposal: add IntlDateTimePatternGenerator

Hi Mel,

I think it could be mentioned for those who don't open the bug report that
HHVM implemented this class long ago:
https://github.com/facebook/hhvm/commit/bc84daf7816e4cd268da59d535dcadfc6cf01085

Regards:
Máté

Mel Dafert mel@dafert.at ezt írta (időpont: 2021. márc. 28., V, 16:54):

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