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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2019 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Utils; |
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use InvalidArgumentException; |
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abstract class XPath |
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{ |
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/** |
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* Export a literal as an XPath expression |
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* |
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* @param mixed $value Literal, e.g. "foo" |
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* @return string XPath expression, e.g. "'foo'" |
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*/ |
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public static function export($value) |
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{ |
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if (!is_scalar($value) || self::isIrrational($value)) |
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{ |
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throw new InvalidArgumentException(__METHOD__ . '() cannot export non-scalar values'); |
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} |
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if (is_int($value)) |
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{ |
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return (string) $value; |
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} |
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if (is_float($value)) |
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{ |
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// Avoid locale issues by using sprintf() |
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return preg_replace('(\\.?0+$)', '', sprintf('%F', $value)); |
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} |
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if (is_bool($value)) |
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{ |
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return ($value) ? 'true()' : 'false()'; |
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} |
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return self::exportString((string) $value); |
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} |
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/** |
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* Export a string as an XPath expression |
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* |
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* @param string $str Literal, e.g. "foo" |
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* @return string XPath expression, e.g. "'foo'" |
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*/ |
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protected static function exportString($str) |
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{ |
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// foo becomes 'foo' |
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if (strpos($str, "'") === false) |
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{ |
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return "'" . $str . "'"; |
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} |
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// d'oh becomes "d'oh" |
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if (strpos($str, '"') === false) |
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{ |
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return '"' . $str . '"'; |
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} |
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// This string contains both ' and ". XPath 1.0 doesn't have a mechanism to escape quotes, |
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// so we have to get creative and use concat() to join chunks in single quotes and chunks |
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// in double quotes |
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$toks = []; |
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$c = '"'; |
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$pos = 0; |
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while ($pos < strlen($str)) |
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{ |
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$spn = strcspn($str, $c, $pos); |
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if ($spn) |
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{ |
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$toks[] = $c . substr($str, $pos, $spn) . $c; |
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$pos += $spn; |
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} |
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$c = ($c === '"') ? "'" : '"'; |
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} |
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return 'concat(' . implode(',', $toks) . ')'; |
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} |
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/** |
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* Test whether given value is an irrational number |
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* |
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* @param mixed $value |
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* @return bool |
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*/ |
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protected static function isIrrational($value) |
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{ |
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return is_float($value) && !is_finite($value); |
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} |
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} |
s9e /
TextFormatter
