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<?php namespace WPDeveloper\BetterDocs\Dependencies\SuperClosure\Analyzer; |
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|
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use WPDeveloper\BetterDocs\Dependencies\SuperClosure\Exception\ClosureAnalysisException; |
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|
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/** |
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* This is the token based analyzer. |
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* |
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* We're using Uses reflection and tokenization to analyze a closure and |
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* determine its code and context. This is much faster than the AST based |
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* implementation. |
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*/ |
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class TokenAnalyzer extends ClosureAnalyzer |
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{ |
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public function determineCode(array &$data) |
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{ |
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$this->determineTokens($data); |
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$data['code'] = implode('', $data['tokens']); |
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$data['hasThis'] = (strpos($data['code'], '$this') !== false); |
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} |
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|
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private function determineTokens(array &$data) |
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{ |
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$potential = $this->determinePotentialTokens($data['reflection']); |
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$braceLevel = $index = $step = $insideUse = 0; |
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$data['tokens'] = $data['context'] = []; |
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|
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foreach ($potential as $token) { |
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$token = new Token($token); |
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switch ($step) { |
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// Handle tokens before the function declaration. |
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case 0: |
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if ($token->is(T_FUNCTION)) { |
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$data['tokens'][] = $token; |
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$step++; |
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} |
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break; |
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// Handle tokens inside the function signature. |
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case 1: |
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$data['tokens'][] = $token; |
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if ($insideUse) { |
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if ($token->is(T_VARIABLE)) { |
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$varName = trim($token, '$ '); |
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$data['context'][$varName] = null; |
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} elseif ($token->is('&')) { |
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$data['hasRefs'] = true; |
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} |
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} elseif ($token->is(T_USE)) { |
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$insideUse++; |
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} |
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if ($token->is('{')) { |
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$step++; |
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$braceLevel++; |
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} |
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break; |
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// Handle tokens inside the function body. |
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case 2: |
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$data['tokens'][] = $token; |
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if ($token->is('{')) { |
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$braceLevel++; |
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} elseif ($token->is('}')) { |
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$braceLevel--; |
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if ($braceLevel === 0) { |
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$step++; |
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} |
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} |
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break; |
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// Handle tokens after the function declaration. |
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case 3: |
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if ($token->is(T_FUNCTION)) { |
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throw new ClosureAnalysisException('Multiple closures ' |
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. 'were declared on the same line of code. Could not ' |
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. 'determine which closure was the intended target.' |
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); |
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} |
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break; |
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} |
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} |
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} |
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|
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private function determinePotentialTokens(\ReflectionFunction $reflection) |
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{ |
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// Load the file containing the code for the function. |
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$fileName = $reflection->getFileName(); |
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if (!is_readable($fileName)) { |
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throw new ClosureAnalysisException( |
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"Cannot read the file containing the closure: \"{$fileName}\"." |
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); |
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} |
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|
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$code = ''; |
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$file = new \SplFileObject($fileName); |
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$file->seek($reflection->getStartLine() - 1); |
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while ($file->key() < $reflection->getEndLine()) { |
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$code .= $file->current(); |
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$file->next(); |
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} |
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|
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$code = trim($code); |
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if (strpos($code, '<?php') !== 0) { |
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$code = "<?php\n" . $code; |
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} |
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|
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return token_get_all($code); |
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} |
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|
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protected function determineContext(array &$data) |
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{ |
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// Get the values of the variables that are closed upon in "use". |
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$values = $data['reflection']->getStaticVariables(); |
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|
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// Construct the context by combining the variable names and values. |
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foreach ($data['context'] as $name => &$value) { |
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if (isset($values[$name])) { |
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$value = $values[$name]; |
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} |
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} |
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} |
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} |
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|
