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<?php |
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namespace CondParse; |
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use CondParse\Exception\LexerException; |
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class Lexer implements LexerInterface |
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{ |
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/** @var callable[] */ |
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private $postFunctions = []; |
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/** @var LexerTokenFactory */ |
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private $lexerTokenFactory; |
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public function __construct() |
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{ |
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$this->lexerTokenFactory = new LexerTokenFactory; |
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} |
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/** |
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* @param callable $postFunction |
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* @return $this |
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*/ |
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public function registerPostFunction(callable $postFunction) |
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{ |
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$this->postFunctions[] = $postFunction; |
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return $this; |
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} |
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/** |
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* @param TokenMap $tokenMap |
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* @return string |
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*/ |
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protected function buildRegex(TokenMap $tokenMap) |
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{ |
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return sprintf( |
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'/%s/Si', |
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join('|', |
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array_map(function ($key, $value) { |
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return sprintf('(?P<%s>%s)', $key, $value); |
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}, array_keys($tokenMap->getTokens()), $tokenMap->getTokens()) |
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) |
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); |
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} |
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/** |
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* @param string $token |
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* @param string $match |
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* @return string |
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*/ |
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protected function applyPostFunctions($token, $match) |
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{ |
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foreach ($this->postFunctions as $postFunction) { |
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$match = call_user_func($postFunction, $token, $match); |
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} |
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return $match; |
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} |
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/** |
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* @param string $conditionString |
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* @param string $regex |
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* @return \Traversable <LexerToken> |
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* @throws LexerException |
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*/ |
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protected function getTokenStreamWithRegex($conditionString, $regex) |
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{ |
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$offSet = 0; |
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$matches = []; |
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while (preg_match($regex, $conditionString, $matches, 0, $offSet) !== 0) { |
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list($match, $token) = $this->extractMatch($matches); |
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$this->checkMatchOffset($conditionString, $match, $offSet); |
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$offSet += strlen($match); |
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yield $this->lexerTokenFactory->buildLexerToken($token, $this->applyPostFunctions($token, $match)); |
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} |
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} |
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/** |
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* @param string $conditionString |
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* @param TokenMap $tokenMap |
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* @return \Traversable <string> |
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*/ |
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public function getTokenStream($conditionString, TokenMap $tokenMap) { |
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return $this->getTokenStreamWithRegex($conditionString, $this->buildRegex($tokenMap)); |
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} |
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/** |
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* @param $matches |
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* @return array |
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*/ |
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protected function extractMatch($matches) |
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{ |
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$matches = array_filter($matches, function ($value, $key) { |
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return is_string($key) && !empty($value); |
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}, ARRAY_FILTER_USE_BOTH); |
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$match = each($matches); |
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$token = $match['key']; |
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$match = $match['value']; |
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return [$match, $token]; |
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} |
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/** |
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* @param $conditionString |
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* @param $match |
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* @param $offSet |
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* @throws LexerException |
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*/ |
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protected function checkMatchOffset($conditionString, $match, $offSet) |
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{ |
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if (($matchOffset = strpos($conditionString, $match, $offSet)) !== $offSet) { |
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throw new LexerException(sprintf( |
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'Found unrecognized token <%s> at offset %d', |
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substr($conditionString, $offSet, ($matchOffset - $offSet)), |
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$offSet |
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1 |
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)); |
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} |
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} |
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} |
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zwilias /
condparse
