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<?php
namespace Punic;
/**
* Plural helper stuff.
*/
class Plural
{
/**
* Return the list of applicable plural rule for a locale.
*
* @param string $locale The locale to use. If empty we'll use the default locale set in \Punic\Data
*
* @return array<string> Returns a list containing some the following values: 'zero', 'one', 'two', 'few', 'many', 'other' ('other' will be always there)
*/
public static function getRules($locale = '')
{
$node = Data::getLanguageNode(Data::getGeneric('plurals'), $locale);
return array_merge(
array_keys($node),
array('other')
);
}
/**
* Return the plural rule ('zero', 'one', 'two', 'few', 'many' or 'other') for a number and a locale.
*
* @param string|int|float $number The number to check the plural rule for for
* @param string $locale The locale to use. If empty we'll use the default locale set in \Punic\Data
*
* @return string Returns one of the following values: 'zero', 'one', 'two', 'few', 'many', 'other'
*
* @throws \Punic\Exception\BadArgumentType Throws a \Punic\Exception\BadArgumentType if $number is not a valid number
* @throws \Exception Throws a \Exception if there were problems calculating the plural rule
*/
public static function getRule($number, $locale = '')
{
if (is_int($number)) {
$intPartAbs = strval(abs($number));
$floatPart = '';
} elseif (is_float($number)) {
$s = strval($number);
if (strpos($s, '.') === false) {
$intPart = $s;
$floatPart = '';
} else {
list($intPart, $floatPart) = explode('.', $s);
}
$intPartAbs = strval(abs(intval($intPart)));
} elseif (is_string($number) && isset($number[0])) {
if (preg_match('/^[+|\\-]?\\d+\\.?$/', $number)) {
$v = intval($number);
$intPartAbs = strval(abs($v));
$floatPart = '';
} elseif (preg_match('/^(\\d*)\\.(\\d+)$/', $number, $m)) {
list($intPart, $floatPart) = explode('.', $number);
$v = @intval($intPart);
$intPartAbs = strval(abs($v));
} else {
throw new Exception\BadArgumentType($number, 'number');
}
} else {
throw new Exception\BadArgumentType($number, 'number');
}
// 'n' => '%1$s', // absolute value of the source number (integer and decimals).
$v1 = $intPartAbs.(strlen($floatPart) ? ".$floatPart" : '');
// 'i' => '%2$s', // integer digits of n
$v2 = $intPartAbs;
// 'v' => '%3$s', // number of visible fraction digits in n, with trailing zeros.
$v3 = strlen($floatPart);
// 'w' => '%4$s', // number of visible fraction digits in n, without trailing zeros.
$v4 = strlen(rtrim($floatPart, '0'));
// 'f' => '%5$s', // visible fractional digits in n, with trailing zeros.
$v5 = strlen($floatPart) ? strval(intval($floatPart)) : '0';
// 't' => '%6$s', // visible fractional digits in n, without trailing zeros.
$v6 = trim($floatPart, '0');
if (!isset($v6[0])) {
$v6 = '0';
}
$result = 'other';
$node = Data::getLanguageNode(Data::getGeneric('plurals'), $locale);
foreach ($node as $rule => $formulaPattern) {
$formula = sprintf($formulaPattern, $v1, $v2, $v3, $v4, $v5, $v6);
$check = str_replace(array('static::inRange(', ' and ', ' or ', ', false, ', ', true, ', ', array('), ' , ', $formula);
if (preg_match('/[a-z]/', $check)) {
throw new \Exception('Bad formula!');
}
// fix for difference in modulo (%) in the definition and the one implemented in PHP for decimal numbers
while (preg_match('/(\\d+\\.\\d+) % (\\d+(\\.\\d+)?)/', $formula, $m)) {
list(, $decimalPart) = explode('.', $m[1], 2);
$decimals = strlen(rtrim($decimalPart, '0'));
if ($decimals > 0) {
$pow = intval(pow(10, $decimals));
$repl = '('.strval(intval(floatval($m[1]) * $pow)).' % '.strval(intval(floatval($m[2] * $pow))).') / '.$pow;
} else {
$repl = strval(intval($m[1])).' % '.$m[2];
}
$formula = str_replace($m[0], $repl, $formula);
}
$formulaResult = @eval("return ($formula) ? 'yes' : 'no';");
if ($formulaResult === 'yes') {
$result = $rule;
break;
} elseif ($formulaResult !== 'no') {
throw new \Exception('There was a problem in the formula '.$formulaPattern);
}
}
return $result;
}
protected static function inRange($value, $mustBeIncluded)
{
if (is_int($value)) {
$isInt = true;
} elseif (intval($value) == $value) {
$isInt = true;
} else {
$isInt = false;
}
$rangeValues = (func_num_args() > 2) ? array_slice(func_get_args(), 2) : array();
$included = false;
foreach ($rangeValues as $rangeValue) {
if (is_array($rangeValue)) {
if ($isInt && ($value >= $rangeValue[0]) && ($value <= $rangeValue[1])) {
$included = true;
break;
}
} elseif ($value == $rangeValue) {
$included = true;
break;
}
}
return $included == $mustBeIncluded;
}
}