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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\Configurator\Helpers; |
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use RuntimeException; |
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use s9e\TextFormatter\Utils\XPath; |
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abstract class XPathHelper |
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{ |
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/** |
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* Return the list of variables used in a given XPath expression |
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* |
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* @param string $expr XPath expression |
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* @return array Alphabetically sorted list of unique variable names |
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*/ |
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public static function getVariables($expr) |
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{ |
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// First, remove strings' contents to prevent false-positives |
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$expr = preg_replace('/(["\']).*?\\1/s', '$1$1', $expr); |
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// Capture all the variable names |
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preg_match_all('/\\$(\\w+)/', $expr, $matches); |
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// Dedupe and sort names |
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$varNames = array_unique($matches[1]); |
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sort($varNames); |
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return $varNames; |
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} |
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/** |
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* Determine whether given XPath expression definitely evaluates to a number |
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* |
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* @param string $expr XPath expression |
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* @return bool Whether given XPath expression definitely evaluates to a number |
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*/ |
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public static function isExpressionNumeric($expr) |
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{ |
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// Trim the expression and remove parentheses that are not part of a function call. PCRE |
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// does not support lookbehind assertions of variable length so we have to flip the string. |
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// We exclude the XPath operator "div" (flipped into "vid") to avoid false positives |
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$expr = strrev(preg_replace('(\\((?!\\s*(?!vid(?!\\w))\\w))', ' ', strrev($expr))); |
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$expr = str_replace(')', ' ', $expr); |
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if (preg_match('(^\\s*([$@][-\\w]++|-?\\.\\d++|-?\\d++(?:\\.\\d++)?)(?>\\s*(?>[-+*]|div)\\s*(?1))++\\s*$)', $expr)) |
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{ |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Remove extraneous space in a given XPath expression |
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* |
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* @param string $expr Original XPath expression |
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* @return string Minified XPath expression |
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*/ |
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public static function minify($expr) |
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{ |
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$old = $expr; |
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$strings = []; |
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// Trim the surrounding whitespace then temporarily remove literal strings |
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$expr = preg_replace_callback( |
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'/"[^"]*"|\'[^\']*\'/', |
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function ($m) use (&$strings) |
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{ |
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$uniqid = '(' . sha1(uniqid()) . ')'; |
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$strings[$uniqid] = $m[0]; |
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return $uniqid; |
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}, |
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trim($expr) |
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); |
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if (preg_match('/[\'"]/', $expr)) |
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{ |
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throw new RuntimeException("Cannot parse XPath expression '" . $old . "'"); |
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} |
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// Normalize whitespace to a single space |
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$expr = preg_replace('/\\s+/', ' ', $expr); |
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// Remove the space between a non-word character and a word character |
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$expr = preg_replace('/([-a-z_0-9]) ([^-a-z_0-9])/i', '$1$2', $expr); |
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$expr = preg_replace('/([^-a-z_0-9]) ([-a-z_0-9])/i', '$1$2', $expr); |
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// Remove the space between two non-word characters as long as they're not two - |
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$expr = preg_replace('/(?!- -)([^-a-z_0-9]) ([^-a-z_0-9])/i', '$1$2', $expr); |
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// Remove the space between a - and a word character, as long as there's a space before - |
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$expr = preg_replace('/ - ([a-z_0-9])/i', ' -$1', $expr); |
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// Remove the spaces between a number and the div operator and the next token |
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$expr = preg_replace('/((?:^|[ \\(])\\d+) div ?/', '$1div', $expr); |
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// Remove the space between the div operator the next token |
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$expr = preg_replace('/([^-a-z_0-9]div) (?=[$0-9@])/', '$1', $expr); |
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// Restore the literals |
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$expr = strtr($expr, $strings); |
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return $expr; |
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} |
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} |
s9e /
TextFormatter
