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phorge/src/view/utils/viewutils.php
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viewutils.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
function phabricator_date($epoch, $user) {
return phabricator_format_local_time(
$epoch,
$user,
_phabricator_date_format($epoch));
}
function phabricator_on_relative_date($epoch, $user) {
return phabricator_relative_date($epoch, $user, true);
}
function phabricator_relative_date($epoch, $user, $on = false) {
static $today;
static $yesterday;
if (!$today || !$yesterday) {
$now = time();
$today = phabricator_date($now, $user);
$yesterday = phabricator_date($now - 86400, $user);
}
$date = phabricator_date($epoch, $user);
if ($date === $today) {
return 'today';
}
if ($date === $yesterday) {
return 'yesterday';
}
return (($on ? 'on ' : '').$date);
}
function phabricator_time($epoch, $user) {
return phabricator_format_local_time(
$epoch,
$user,
'g:i A');
}
function phabricator_datetime($epoch, $user) {
return phabricator_format_local_time(
$epoch,
$user,
_phabricator_date_format($epoch).', g:i A');
}
function _phabricator_date_format($epoch) {
$format = 'M j Y';
$now = time();
if ($epoch <= $now && $epoch > $now - 30 * 24 * 60 * 60) {
$format = 'D, M j';
}
return $format;
}
/**
* This function does not usually need to be called directly. Instead, call
* @{function:phabricator_date}, @{function:phabricator_time}, or
* @{function:phabricator_datetime}.
*
* @param int Unix epoch timestamp.
* @param PhabricatorUser User viewing the timestamp.
* @param string Date format, as per DateTime class.
* @return string Formatted, local date/time.
*/
function phabricator_format_local_time($epoch, $user, $format) {
if (!$epoch) {
// If we're missing date information for something, the DateTime class will
// throw an exception when we try to construct an object. Since this is a
// display function, just return an empty string.
return '';
}
$user_zone = $user->getTimezoneIdentifier();
static $zones = array();
if (empty($zones[$user_zone])) {
$zones[$user_zone] = new DateTimeZone($user_zone);
}
$zone = $zones[$user_zone];
// NOTE: Although DateTime takes a second DateTimeZone parameter to its
// constructor, it ignores it if the date string includes timezone
// information. Further, it treats epoch timestamps ("@946684800") as having
// a UTC timezone. Set the timezone explicitly after constructing the object.
try {
$date = new DateTime('@'.$epoch);
} catch (Exception $ex) {
// NOTE: DateTime throws an empty exception if the format is invalid,
// just replace it with a useful one.
throw new Exception(
"Construction of a DateTime() with epoch '{$epoch}' ".
"raised an exception.");
}
$date->setTimeZone($zone);
return $date->format($format);
}
function phabricator_format_relative_time($duration) {
return phabricator_format_units_generic(
$duration,
array(60, 60, 24, 7),
array('s', 'm', 'h', 'd', 'w'),
$precision = 0);
}
/**
* Format a byte count for human consumption, e.g. "10MB" instead of
* "10000000".
*
* @param int Number of bytes.
* @return string Human-readable description.
*/
function phabricator_format_bytes($bytes) {
return phabricator_format_units_generic(
$bytes,
// NOTE: Using the SI version of these units rather than the 1024 version.
array(1000, 1000, 1000, 1000, 1000),
array('B', 'KB', 'MB', 'GB', 'TB', 'PB'),
$precision = 0);
}
/**
* Parse a human-readable byte description (like "6MB") into an integer.
*
* @param string Human-readable description.
* @return int Number of represented bytes.
*/
function phabricator_parse_bytes($input) {
$bytes = trim($input);
if (!strlen($bytes)) {
return null;
}
// NOTE: Assumes US-centric numeral notation.
$bytes = preg_replace('/[ ,]/', '', $bytes);
$matches = null;
if (!preg_match('/^(?:\d+(?:[.]\d+)?)([kmgtp]?)b?$/i', $bytes, $matches)) {
throw new Exception("Unable to parse byte size '{$input}'!");
}
$scale = array(
'k' => 1000,
'm' => 1000 * 1000,
'g' => 1000 * 1000 * 1000,
't' => 1000 * 1000 * 1000 * 1000,
);
$bytes = (float)$bytes;
if ($matches[1]) {
$bytes *= $scale[strtolower($matches[1])];
}
return (int)$bytes;
}
function phabricator_format_units_generic(
$n,
array $scales,
array $labels,
$precision = 0,
&$remainder = null) {
$is_negative = false;
if ($n < 0) {
$is_negative = true;
$n = abs($n);
}
$remainder = 0;
$accum = 1;
$scale = array_shift($scales);
$label = array_shift($labels);
while ($n >= $scale && count($labels)) {
$remainder += ($n % $scale) * $accum;
$n /= $scale;
$accum *= $scale;
$label = array_shift($labels);
if (!count($scales)) {
break;
}
$scale = array_shift($scales);
}
if ($is_negative) {
$n = -$n;
$remainder = -$remainder;
}
if ($precision) {
$num_string = number_format($n, $precision);
} else {
$num_string = (int)floor($n);
}
if ($label) {
$num_string .= ' '.$label;
}
return $num_string;
}

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