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<?php |
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/* |
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* This file is part of the Behat Gherkin. |
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* (c) Konstantin Kudryashov <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Behat\Gherkin; |
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use Behat\Gherkin\Exception\LexerException; |
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use Behat\Gherkin\Keywords\KeywordsInterface; |
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/** |
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* Gherkin lexer. |
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* |
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* @author Konstantin Kudryashov <[email protected]> |
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*/ |
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class Lexer |
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{ |
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private $language; |
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private $lines; |
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private $linesCount; |
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private $line; |
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private $trimmedLine; |
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private $lineNumber; |
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private $eos; |
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private $keywords; |
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private $keywordsCache = array(); |
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private $stepKeywordTypesCache = array(); |
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private $deferredObjects = array(); |
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private $deferredObjectsCount = 0; |
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private $stashedToken; |
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private $inPyString = false; |
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private $pyStringSwallow = 0; |
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private $featureStarted = false; |
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private $allowMultilineArguments = false; |
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private $allowSteps = false; |
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/** |
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* Initializes lexer. |
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* |
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* @param KeywordsInterface $keywords Keywords holder |
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*/ |
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public function __construct(KeywordsInterface $keywords) |
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{ |
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$this->keywords = $keywords; |
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} |
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/** |
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* Sets lexer input. |
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* |
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* @param string $input Input string |
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* @param string $language Language name |
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* |
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* @throws Exception\LexerException |
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*/ |
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public function analyse($input, $language = 'en') |
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{ |
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// try to detect unsupported encoding |
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if ('UTF-8' !== mb_detect_encoding($input, 'UTF-8', true)) { |
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throw new LexerException('Feature file is not in UTF8 encoding'); |
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} |
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$input = strtr($input, array("\r\n" => "\n", "\r" => "\n")); |
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$this->lines = explode("\n", $input); |
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$this->linesCount = count($this->lines); |
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$this->line = $this->lines[0]; |
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$this->lineNumber = 1; |
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$this->trimmedLine = null; |
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$this->eos = false; |
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$this->deferredObjects = array(); |
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$this->deferredObjectsCount = 0; |
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$this->stashedToken = null; |
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$this->inPyString = false; |
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$this->pyStringSwallow = 0; |
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$this->featureStarted = false; |
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$this->allowMultilineArguments = false; |
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$this->allowSteps = false; |
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$this->keywords->setLanguage($this->language = $language); |
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$this->keywordsCache = array(); |
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$this->stepKeywordTypesCache = array(); |
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} |
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/** |
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* Returns current lexer language. |
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* |
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* @return string |
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*/ |
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public function getLanguage() |
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{ |
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return $this->language; |
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} |
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/** |
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* Returns next token or previously stashed one. |
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* |
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* @return array |
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*/ |
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public function getAdvancedToken() |
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{ |
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return $this->getStashedToken() ?: $this->getNextToken(); |
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} |
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/** |
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* Defers token. |
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* |
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* @param array $token Token to defer |
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*/ |
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public function deferToken(array $token) |
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{ |
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$token['deferred'] = true; |
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$this->deferredObjects[] = $token; |
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++$this->deferredObjectsCount; |
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} |
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/** |
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* Predicts for number of tokens. |
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* |
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* @return array |
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*/ |
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public function predictToken() |
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{ |
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if (null === $this->stashedToken) { |
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$this->stashedToken = $this->getNextToken(); |
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} |
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return $this->stashedToken; |
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} |
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/** |
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* Constructs token with specified parameters. |
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* |
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* @param string $type Token type |
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* @param string $value Token value |
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* |
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* @return array |
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*/ |
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public function takeToken($type, $value = null) |
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{ |
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return array( |
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'type' => $type, |
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'line' => $this->lineNumber, |
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'value' => $value ?: null, |
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'deferred' => false |
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); |
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} |
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/** |
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* Consumes line from input & increments line counter. |
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*/ |
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protected function consumeLine() |
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{ |
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++$this->lineNumber; |
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if (($this->lineNumber - 1) === $this->linesCount) { |
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$this->eos = true; |
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return; |
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} |
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$this->line = $this->lines[$this->lineNumber - 1]; |
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$this->trimmedLine = null; |
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} |
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/** |
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* Returns trimmed version of line. |
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* |
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* @return string |
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*/ |
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protected function getTrimmedLine() |
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{ |
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return null !== $this->trimmedLine ? $this->trimmedLine : $this->trimmedLine = trim($this->line); |
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} |
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/** |
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* Returns stashed token or null if hasn't. |
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* |
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* @return array|null |
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*/ |
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protected function getStashedToken() |
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{ |
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$stashedToken = $this->stashedToken; |
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$this->stashedToken = null; |
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return $stashedToken; |
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} |
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/** |
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* Returns deferred token or null if hasn't. |
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* |
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* @return array|null |
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*/ |
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protected function getDeferredToken() |
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{ |
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if (!$this->deferredObjectsCount) { |
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return null; |
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} |
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--$this->deferredObjectsCount; |
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return array_shift($this->deferredObjects); |
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} |
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/** |
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* Returns next token from input. |
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* |
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* @return array |
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*/ |
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protected function getNextToken() |
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{ |
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return $this->getDeferredToken() |
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?: $this->scanEOS() |
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?: $this->scanLanguage() |
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?: $this->scanComment() |
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?: $this->scanPyStringOp() |
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?: $this->scanPyStringContent() |
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?: $this->scanStep() |
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?: $this->scanScenario() |
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?: $this->scanBackground() |
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?: $this->scanOutline() |
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?: $this->scanExamples() |
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?: $this->scanFeature() |
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?: $this->scanTags() |
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?: $this->scanTableRow() |
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?: $this->scanNewline() |
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?: $this->scanText(); |
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} |
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/** |
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* Scans for token with specified regex. |
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* |
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* @param string $regex Regular expression |
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* @param string $type Expected token type |
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* |
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* @return null|array |
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*/ |
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protected function scanInput($regex, $type) |
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{ |
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if (!preg_match($regex, $this->line, $matches)) { |
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return null; |
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} |
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$token = $this->takeToken($type, $matches[1]); |
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$this->consumeLine(); |
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return $token; |
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} |
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/** |
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* Scans for token with specified keywords. |
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* |
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* @param string $keywords Keywords (splitted with |) |
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* @param string $type Expected token type |
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* |
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* @return null|array |
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*/ |
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protected function scanInputForKeywords($keywords, $type) |
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{ |
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if (!preg_match('/^(\s*)(' . $keywords . '):\s*(.*)/u', $this->line, $matches)) { |
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return null; |
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} |
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$token = $this->takeToken($type, $matches[3]); |
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$token['keyword'] = $matches[2]; |
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$token['indent'] = mb_strlen($matches[1], 'utf8'); |
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$this->consumeLine(); |
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// turn off language searching |
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if ('Feature' === $type) { |
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$this->featureStarted = true; |
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} |
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// turn off PyString and Table searching |
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if ('Feature' === $type || 'Scenario' === $type || 'Outline' === $type) { |
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$this->allowMultilineArguments = false; |
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} elseif ('Examples' === $type) { |
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$this->allowMultilineArguments = true; |
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} |
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// turn on steps searching |
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if ('Scenario' === $type || 'Background' === $type || 'Outline' === $type) { |
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$this->allowSteps = true; |
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} |
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return $token; |
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} |
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/** |
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* Scans EOS from input & returns it if found. |
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* |
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* @return null|array |
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*/ |
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protected function scanEOS() |
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{ |
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if (!$this->eos) { |
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return null; |
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} |
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return $this->takeToken('EOS'); |
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} |
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/** |
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* Returns keywords for provided type. |
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* |
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* @param string $type Keyword type |
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* |
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* @return string |
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*/ |
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protected function getKeywords($type) |
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{ |
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if (!isset($this->keywordsCache[$type])) { |
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$getter = 'get' . $type . 'Keywords'; |
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$keywords = $this->keywords->$getter(); |
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if ('Step' === $type) { |
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$padded = array(); |
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foreach (explode('|', $keywords) as $keyword) { |
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$padded[] = false !== mb_strpos($keyword, '<', 0, 'utf8') |
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? preg_quote(mb_substr($keyword, 0, -1, 'utf8'), '/') . '\s*' |
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: preg_quote($keyword, '/') . '\s+'; |
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} |
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$keywords = implode('|', $padded); |
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} |
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$this->keywordsCache[$type] = $keywords; |
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} |
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return $this->keywordsCache[$type]; |
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} |
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/** |
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* Scans Feature from input & returns it if found. |
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* |
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* @return null|array |
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*/ |
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protected function scanFeature() |
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{ |
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return $this->scanInputForKeywords($this->getKeywords('Feature'), 'Feature'); |
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} |
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/** |
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* Scans Background from input & returns it if found. |
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* |
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* @return null|array |
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*/ |
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protected function scanBackground() |
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{ |
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return $this->scanInputForKeywords($this->getKeywords('Background'), 'Background'); |
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} |
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/** |
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* Scans Scenario from input & returns it if found. |
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* |
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* @return null|array |
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*/ |
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protected function scanScenario() |
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{ |
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return $this->scanInputForKeywords($this->getKeywords('Scenario'), 'Scenario'); |
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} |
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/** |
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* Scans Scenario Outline from input & returns it if found. |
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* |
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* @return null|array |
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*/ |
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protected function scanOutline() |
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{ |
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return $this->scanInputForKeywords($this->getKeywords('Outline'), 'Outline'); |
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} |
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/** |
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* Scans Scenario Outline Examples from input & returns it if found. |
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* |
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* @return null|array |
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*/ |
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protected function scanExamples() |
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{ |
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return $this->scanInputForKeywords($this->getKeywords('Examples'), 'Examples'); |
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} |
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/** |
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* Scans Step from input & returns it if found. |
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* |
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* @return null|array |
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|
*/ |
395
|
52 |
|
protected function scanStep() |
396
|
|
|
{ |
397
|
52 |
|
if (!$this->allowSteps) { |
398
|
52 |
|
return null; |
399
|
|
|
} |
400
|
|
|
|
401
|
43 |
|
$keywords = $this->getKeywords('Step'); |
402
|
43 |
|
if (!preg_match('/^\s*(' . $keywords . ')([^\s].+)/u', $this->line, $matches)) { |
403
|
40 |
|
return null; |
404
|
|
|
} |
405
|
|
|
|
406
|
39 |
|
$keyword = trim($matches[1]); |
407
|
39 |
|
$token = $this->takeToken('Step', $keyword); |
408
|
39 |
|
$token['keyword_type'] = $this->getStepKeywordType($keyword); |
409
|
39 |
|
$token['text'] = $matches[2]; |
410
|
|
|
|
411
|
39 |
|
$this->consumeLine(); |
412
|
39 |
|
$this->allowMultilineArguments = true; |
413
|
|
|
|
414
|
39 |
|
return $token; |
415
|
|
|
} |
416
|
|
|
|
417
|
|
|
/** |
418
|
|
|
* Scans PyString from input & returns it if found. |
419
|
|
|
* |
420
|
|
|
* @return null|array |
421
|
|
|
*/ |
422
|
52 |
|
protected function scanPyStringOp() |
423
|
|
|
{ |
424
|
52 |
|
if (!$this->allowMultilineArguments) { |
425
|
52 |
|
return null; |
426
|
|
|
} |
427
|
|
|
|
428
|
40 |
|
if (false === ($pos = mb_strpos($this->line, '"""', 0, 'utf8'))) { |
429
|
40 |
|
return null; |
430
|
|
|
} |
431
|
|
|
|
432
|
10 |
|
$this->inPyString = !$this->inPyString; |
433
|
10 |
|
$token = $this->takeToken('PyStringOp'); |
434
|
10 |
|
$this->pyStringSwallow = $pos; |
435
|
|
|
|
436
|
10 |
|
$this->consumeLine(); |
437
|
|
|
|
438
|
10 |
|
return $token; |
439
|
|
|
} |
440
|
|
|
|
441
|
|
|
/** |
442
|
|
|
* Scans PyString content. |
443
|
|
|
* |
444
|
|
|
* @return null|array |
445
|
|
|
*/ |
446
|
52 |
|
protected function scanPyStringContent() |
447
|
|
|
{ |
448
|
52 |
|
if (!$this->inPyString) { |
449
|
52 |
|
return null; |
450
|
|
|
} |
451
|
|
|
|
452
|
10 |
|
$token = $this->scanText(); |
453
|
|
|
// swallow trailing spaces |
454
|
10 |
|
$token['value'] = preg_replace('/^\s{0,' . $this->pyStringSwallow . '}/u', '', $token['value']); |
455
|
|
|
|
456
|
10 |
|
return $token; |
457
|
|
|
} |
458
|
|
|
|
459
|
|
|
/** |
460
|
|
|
* Scans Table Row from input & returns it if found. |
461
|
|
|
* |
462
|
|
|
* @return null|array |
463
|
|
|
*/ |
464
|
51 |
|
protected function scanTableRow() |
465
|
|
|
{ |
466
|
51 |
|
if (!$this->allowMultilineArguments) { |
467
|
45 |
|
return null; |
468
|
|
|
} |
469
|
|
|
|
470
|
36 |
|
$line = $this->getTrimmedLine(); |
471
|
36 |
|
if (!isset($line[0]) || '|' !== $line[0] || '|' !== substr($line, -1)) { |
472
|
36 |
|
return null; |
473
|
|
|
} |
474
|
|
|
|
475
|
17 |
|
$token = $this->takeToken('TableRow'); |
476
|
17 |
|
$line = mb_substr($line, 1, mb_strlen($line, 'utf8') - 2, 'utf8'); |
477
|
17 |
|
$columns = array_map(function ($column) { |
478
|
17 |
|
return trim(str_replace('\\|', '|', $column)); |
479
|
17 |
|
}, preg_split('/(?<!\\\)\|/u', $line)); |
480
|
17 |
|
$token['columns'] = $columns; |
481
|
|
|
|
482
|
17 |
|
$this->consumeLine(); |
483
|
|
|
|
484
|
17 |
|
return $token; |
485
|
|
|
} |
486
|
|
|
|
487
|
|
|
/** |
488
|
|
|
* Scans Tags from input & returns it if found. |
489
|
|
|
* |
490
|
|
|
* @return null|array |
491
|
|
|
*/ |
492
|
51 |
|
protected function scanTags() |
493
|
|
|
{ |
494
|
51 |
|
$line = $this->getTrimmedLine(); |
495
|
51 |
|
if (!isset($line[0]) || '@' !== $line[0]) { |
496
|
51 |
|
return null; |
497
|
|
|
} |
498
|
|
|
|
499
|
4 |
|
$token = $this->takeToken('Tag'); |
500
|
4 |
|
$tags = explode('@', mb_substr($line, 1, mb_strlen($line, 'utf8') - 1, 'utf8')); |
501
|
4 |
|
$tags = array_map('trim', $tags); |
502
|
4 |
|
$token['tags'] = $tags; |
503
|
|
|
|
504
|
4 |
|
$this->consumeLine(); |
505
|
|
|
|
506
|
4 |
|
return $token; |
507
|
|
|
} |
508
|
|
|
|
509
|
|
|
/** |
510
|
|
|
* Scans Language specifier from input & returns it if found. |
511
|
|
|
* |
512
|
|
|
* @return null|array |
513
|
|
|
*/ |
514
|
52 |
|
protected function scanLanguage() |
515
|
|
|
{ |
516
|
52 |
|
if ($this->featureStarted) { |
517
|
51 |
|
return null; |
518
|
|
|
} |
519
|
|
|
|
520
|
52 |
|
if ($this->inPyString) { |
521
|
|
|
return null; |
522
|
|
|
} |
523
|
|
|
|
524
|
52 |
|
if (0 !== mb_strpos(ltrim($this->line), '#', 0, 'utf8')) { |
525
|
52 |
|
return null; |
526
|
|
|
} |
527
|
|
|
|
528
|
11 |
|
return $this->scanInput('/^\s*\#\s*language:\s*([\w_\-]+)\s*$/', 'Language'); |
529
|
|
|
} |
530
|
|
|
|
531
|
|
|
/** |
532
|
|
|
* Scans Comment from input & returns it if found. |
533
|
|
|
* |
534
|
|
|
* @return null|array |
535
|
|
|
*/ |
536
|
52 |
|
protected function scanComment() |
537
|
|
|
{ |
538
|
52 |
|
if ($this->inPyString) { |
539
|
10 |
|
return null; |
540
|
|
|
} |
541
|
|
|
|
542
|
52 |
|
$line = $this->getTrimmedLine(); |
543
|
52 |
|
if (0 !== mb_strpos($line, '#', 0, 'utf8')) { |
544
|
52 |
|
return null; |
545
|
|
|
} |
546
|
|
|
|
547
|
8 |
|
$token = $this->takeToken('Comment', $line); |
548
|
8 |
|
$this->consumeLine(); |
549
|
|
|
|
550
|
8 |
|
return $token; |
551
|
|
|
} |
552
|
|
|
|
553
|
|
|
/** |
554
|
|
|
* Scans Newline from input & returns it if found. |
555
|
|
|
* |
556
|
|
|
* @return null|array |
557
|
|
|
*/ |
558
|
51 |
|
protected function scanNewline() |
559
|
|
|
{ |
560
|
51 |
|
if ('' !== $this->getTrimmedLine()) { |
561
|
29 |
|
return null; |
562
|
|
|
} |
563
|
|
|
|
564
|
51 |
|
$token = $this->takeToken('Newline', mb_strlen($this->line, 'utf8')); |
565
|
51 |
|
$this->consumeLine(); |
566
|
|
|
|
567
|
51 |
|
return $token; |
568
|
|
|
} |
569
|
|
|
|
570
|
|
|
/** |
571
|
|
|
* Scans text from input & returns it if found. |
572
|
|
|
* |
573
|
|
|
* @return null|array |
574
|
|
|
*/ |
575
|
36 |
|
protected function scanText() |
576
|
|
|
{ |
577
|
36 |
|
$token = $this->takeToken('Text', $this->line); |
578
|
36 |
|
$this->consumeLine(); |
579
|
|
|
|
580
|
36 |
|
return $token; |
581
|
|
|
} |
582
|
|
|
|
583
|
|
|
/** |
584
|
|
|
* Returns step type keyword (Given, When, Then, etc.). |
585
|
|
|
* |
586
|
|
|
* @param string $native Step keyword in provided language |
587
|
|
|
* @return string |
588
|
|
|
*/ |
589
|
39 |
|
private function getStepKeywordType($native) |
590
|
|
|
{ |
591
|
39 |
|
if (empty($this->stepKeywordTypesCache)) { |
592
|
39 |
|
$this->stepKeywordTypesCache = array( |
593
|
39 |
|
'Given' => explode('|', $this->keywords->getGivenKeywords()), |
594
|
39 |
|
'When' => explode('|', $this->keywords->getWhenKeywords()), |
595
|
39 |
|
'Then' => explode('|', $this->keywords->getThenKeywords()), |
596
|
39 |
|
'And' => explode('|', $this->keywords->getAndKeywords()), |
597
|
39 |
|
'But' => explode('|', $this->keywords->getButKeywords()) |
598
|
39 |
|
); |
599
|
39 |
|
} |
600
|
|
|
|
601
|
39 |
|
foreach ($this->stepKeywordTypesCache as $type => $keywords) { |
602
|
39 |
|
if (in_array($native, $keywords) || in_array($native . '<', $keywords)) { |
603
|
39 |
|
return $type; |
604
|
|
|
} |
605
|
25 |
|
} |
606
|
|
|
|
607
|
|
|
return 'Given'; |
608
|
|
|
} |
609
|
|
|
} |
610
|
|
|
|