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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2017 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($value)) |
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{ |
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throw new InvalidArgumentException(__METHOD__ . '() cannot export non-scalar values'); |
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} |
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if (is_int($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', $value)); |
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} |
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return self::exportString($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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} |
s9e /
TextFormatter
This check looks at variables that have been passed in as parameters and are passed out again to other methods.
If the outgoing method call has stricter type requirements than the method itself, an issue is raised.
An additional type check may prevent trouble.