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<?php
namespace Gettext\Languages;
use Exception;
/**
* A helper class that handles a single category rules (eg 'zero', 'one', ...) and its formula and examples.
*/
class Category
{
/**
* The category identifier (eg 'zero', 'one', ..., 'other').
* @var string
*/
public $id;
/**
* The gettext formula that identifies this category (null if and only if the category is 'other').
* @var string|null
*/
public $formula;
/**
* The CLDR representation of some exemplar numeric ranges that satisfy this category.
* @var string|null
*/
public $examples;
/**
* Initialize the instance and parse the formula.
* @param string $cldrCategoryId The CLDR category identifier (eg 'pluralRule-count-one').
* @param string $cldrFormulaAndExamples The CLDR formula and examples (eg 'i = 1 and v = 0 @integer 1').
* @throws Exception
*/
public function __construct($cldrCategoryId, $cldrFormulaAndExamples)
{
$matches = array();
if (!preg_match('/^pluralRule-count-(.+)$/', $cldrCategoryId, $matches)) {
throw new Exception("Invalid CLDR category: '$cldrCategoryId'");
}
if (!in_array($matches[1], CldrData::$categories)) {
throw new Exception("Invalid CLDR category: '$cldrCategoryId'");
}
$this->id = $matches[1];
$cldrFormulaAndExamplesNormalized = trim(preg_replace('/\s+/', ' ', $cldrFormulaAndExamples));
if (!preg_match('/^([^@]*)(?:@integer([^@]+))?(?:@decimal(?:[^@]+))?$/', $cldrFormulaAndExamplesNormalized, $matches)) {
throw new Exception("Invalid CLDR category rule: $cldrFormulaAndExamples");
}
$cldrFormula = trim($matches[1]);
$s = isset($matches[2]) ? trim($matches[2]) : '';
$this->examples = ($s === '') ? null : $s;
switch ($this->id) {
case CldrData::OTHER_CATEGORY:
if ($cldrFormula !== '') {
throw new Exception("The '".CldrData::OTHER_CATEGORY."' category should not have any formula, but it has '$cldrFormula'");
}
$this->formula = null;
break;
default:
if ($cldrFormula === '') {
throw new Exception("The '{$this->id}' category does not have a formula");
}
$this->formula = FormulaConverter::convertFormula($cldrFormula);
break;
}
}
/**
* Return a list of numbers corresponding to the $examples value.
* @throws Exception Throws an Exception if we weren't able to expand the examples.
* @return int[]
*/
public function getExampleIntegers()
{
return self::expandExamples($this->examples);
}
/**
* Expand a list of examples as defined by CLDR.
* @param string $examples A string like '1, 2, 5...7, …'.
* @throws Exception Throws an Exception if we weren't able to expand $examples.
* @return int[]
*/
public static function expandExamples($examples)
{
$result = array();
$m = null;
if (substr($examples, -strlen(', …')) === ', …') {
$examples = substr($examples, 0, strlen($examples) -strlen(', …'));
}
foreach (explode(',', str_replace(' ', '', $examples)) as $range) {
if (preg_match('/^\d+$/', $range)) {
$result[] = intval($range);
} elseif (preg_match('/^(\d+)~(\d+)$/', $range, $m)) {
$from = intval($m[1]);
$to = intval($m[2]);
$delta = $to - $from;
$step = (int) max(1, $delta / 100);
for ($i = $from; $i < $to; $i += $step) {
$result[] = $i;
}
$result[] = $to;
} else {
throw new Exception("Unhandled test range '$range' in '$examples'");
}
}
if (empty($result)) {
throw new Exception("No test numbers from '$examples'");
}
return $result;
}
}
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