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<?php |
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/* |
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* This file is a part of graphql-youshido project. |
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* |
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* @author Portey Vasil <[email protected]> |
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* created: 11/23/15 1:22 AM |
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*/ |
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namespace Youshido\GraphQL\Parser; |
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use Youshido\GraphQL\Parser\Ast\TypedFragmentReference; |
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use Youshido\GraphQL\Parser\Exception\SyntaxErrorException; |
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use Youshido\GraphQL\Parser\Value\InputList; |
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use Youshido\GraphQL\Parser\Ast\Argument; |
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use Youshido\GraphQL\Parser\Ast\Field; |
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use Youshido\GraphQL\Parser\Ast\Fragment; |
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use Youshido\GraphQL\Parser\Ast\FragmentReference; |
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use Youshido\GraphQL\Parser\Value\InputObject; |
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use Youshido\GraphQL\Parser\Value\Literal; |
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use Youshido\GraphQL\Parser\Ast\Mutation; |
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use Youshido\GraphQL\Parser\Ast\Query; |
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use Youshido\GraphQL\Parser\Value\Variable; |
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use Youshido\GraphQL\Parser\Exception\DuplicationVariableException; |
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use Youshido\GraphQL\Parser\Exception\UnusedVariableException; |
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use Youshido\GraphQL\Parser\Exception\VariableTypeNotDefined; |
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class Parser extends Tokenizer |
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{ |
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/** @var array */ |
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protected $variablesTypes = []; |
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/** @var array */ |
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protected $variableTypeUsage = []; |
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public function parse() |
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{ |
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$data = ['queries' => [], 'mutations' => [], 'fragments' => []]; |
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while (!$this->end()) { |
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$tokenType = $this->peek()->getType(); |
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switch ($tokenType) { |
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case Token::TYPE_LBRACE: |
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case Token::TYPE_QUERY: |
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$data = array_merge($data, ['queries' => $this->parseBody()]); |
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break; |
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case Token::TYPE_MUTATION: |
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$data = array_merge($data, ['mutations' => $this->parseBody(Token::TYPE_MUTATION)]); |
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break; |
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case Token::TYPE_FRAGMENT: |
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$data['fragments'][] = $this->parseFragment(); |
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break; |
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default: |
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throw new SyntaxErrorException(); |
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} |
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} |
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$this->checkVariableUsage(); |
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return $data; |
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} |
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protected function parseBody($token = Token::TYPE_QUERY, $highLevel = true) |
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{ |
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$fields = []; |
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$first = true; |
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if ($this->peek()->getType() == $token && $highLevel) { |
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$this->lex(); |
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$this->eat(Token::TYPE_IDENTIFIER); |
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if ($this->match(Token::TYPE_LPAREN)) { |
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$this->variablesTypes = $this->parseVariableTypes(); |
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} |
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} |
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$this->lex(); |
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while (!$this->match(Token::TYPE_RBRACE) && !$this->end()) { |
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if ($first) { |
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$first = false; |
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} else { |
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$this->eatMulti([Token::TYPE_COMMA]); |
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} |
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if ($this->match(Token::TYPE_FRAGMENT_REFERENCE)) { |
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$this->lex(); |
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if ($this->eat(Token::TYPE_ON)) { |
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$fields[] = $this->parseBodyItem(Token::TYPE_TYPED_FRAGMENT, $highLevel); |
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} else { |
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$fields[] = $this->parseFragmentReference(); |
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} |
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} else { |
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$fields[] = $this->parseBodyItem($token, $highLevel); |
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} |
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} |
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$this->expect(Token::TYPE_RBRACE); |
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return $fields; |
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} |
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protected function checkVariableUsage() |
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{ |
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if ($this->variablesTypes && count($this->variablesTypes) != count($this->variableTypeUsage)) { |
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throw new UnusedVariableException(sprintf('Not all variables in query was used')); |
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} |
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} |
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protected function parseVariableTypes() |
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{ |
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$types = []; |
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$first = true; |
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$this->eat(Token::TYPE_LPAREN); |
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while (!$this->match(Token::TYPE_RPAREN) && !$this->end()) { |
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if ($first) { |
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$first = false; |
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} else { |
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$this->expect(Token::TYPE_COMMA); |
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} |
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$this->eat(Token::TYPE_VARIABLE); |
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$name = $this->parseIdentifier(); |
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$this->eat(Token::TYPE_COLON); |
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$type = $this->parseIdentifier(); |
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if (array_key_exists($name, $types)) { |
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throw new DuplicationVariableException(sprintf('"%s" variable duplication', $name)); |
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} |
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$types[$name] = $type; |
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} |
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$this->expect(Token::TYPE_RPAREN); |
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return $types; |
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} |
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protected function expect($type) |
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{ |
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if ($this->match($type)) { |
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return $this->lex(); |
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} |
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throw $this->createUnexpected($this->peek()); |
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} |
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protected function expectMulti($types) |
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{ |
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if ($this->matchMulti($types)) { |
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return $this->lex(); |
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} |
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throw $this->createUnexpected($this->peek()); |
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} |
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protected function parseReference() |
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{ |
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$this->expectMulti([Token::TYPE_AMP, Token::TYPE_VARIABLE]); |
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if ($this->match(Token::TYPE_NUMBER) || $this->match(Token::TYPE_IDENTIFIER)) { |
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$name = $this->lex()->getData(); |
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if (!array_key_exists($name, $this->variablesTypes)) { |
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throw new VariableTypeNotDefined(sprintf('Type for variable "%s" not defined', $name)); |
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} |
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$this->variableTypeUsage[$name] = true; |
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return new Variable($name, $this->variablesTypes[$name]); |
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} |
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throw $this->createUnexpected($this->peek()); |
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} |
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protected function parseFragmentReference() |
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{ |
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$name = $this->parseIdentifier(); |
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return new FragmentReference($name); |
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} |
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protected function parseIdentifier() |
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{ |
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return $this->expectMulti([ |
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Token::TYPE_IDENTIFIER, |
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Token::TYPE_MUTATION, |
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Token::TYPE_QUERY, |
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Token::TYPE_FRAGMENT, |
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])->getData(); |
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} |
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protected function parseBodyItem($type = Token::TYPE_QUERY, $highLevel = true) |
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{ |
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$name = $this->parseIdentifier(); |
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$alias = null; |
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if ($this->eat(Token::TYPE_COLON)) { |
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$alias = $name; |
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$name = $this->parseIdentifier(); |
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} |
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$arguments = $this->match(Token::TYPE_LPAREN) ? $this->parseArgumentList() : []; |
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if ($this->match(Token::TYPE_LBRACE)) { |
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$fields = $this->parseBody($type == Token::TYPE_TYPED_FRAGMENT ? Token::TYPE_QUERY : $type, false); |
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if ($type == Token::TYPE_QUERY) { |
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return new Query($name, $alias, $arguments, $fields); |
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} elseif ($type == Token::TYPE_TYPED_FRAGMENT) { |
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return new TypedFragmentReference($name, $fields); |
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} else { |
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return new Mutation($name, $alias, $arguments, $fields); |
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} |
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} else { |
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if ($highLevel && $type == Token::TYPE_MUTATION) { |
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return new Mutation($name, $alias, $arguments); |
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} |
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return new Field($name, $alias); |
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} |
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} |
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21 |
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protected function parseArgumentList() |
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{ |
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$args = []; |
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$first = true; |
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21 |
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$this->expect(Token::TYPE_LPAREN); |
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while (!$this->match(Token::TYPE_RPAREN) && !$this->end()) { |
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21 |
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if ($first) { |
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$first = false; |
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} else { |
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$this->expect(Token::TYPE_COMMA); |
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} |
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$args[] = $this->parseArgument(); |
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} |
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16 |
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$this->expect(Token::TYPE_RPAREN); |
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return $args; |
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} |
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21 |
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protected function parseArgument() |
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{ |
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$name = $this->parseIdentifier(); |
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$this->expect(Token::TYPE_COLON); |
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$value = $this->parseValue(); |
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return new Argument($name, $value); |
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} |
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21 |
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protected function parseValue() |
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{ |
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21 |
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switch ($this->lookAhead->getType()) { |
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21 |
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case Token::TYPE_LSQUARE_BRACE: |
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3 |
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return $this->parseList(); |
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18 |
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case Token::TYPE_LBRACE: |
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2 |
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return $this->parseObject(); |
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16 |
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case Token::TYPE_AMP: |
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16 |
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case Token::TYPE_VARIABLE: |
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4 |
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return $this->parseReference(); |
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12 |
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case Token::TYPE_NUMBER: |
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12 |
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case Token::TYPE_STRING: |
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12 |
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case Token::TYPE_IDENTIFIER: |
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return new Literal($this->lex()->getData()); |
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3 |
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case Token::TYPE_NULL: |
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3 |
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case Token::TYPE_TRUE: |
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3 |
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case Token::TYPE_FALSE: |
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1 |
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return new Literal($this->lex()->getData()); |
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285
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2 |
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} |
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2 |
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throw $this->createUnexpected($this->lookAhead); |
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} |
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4 |
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protected function parseList($createType = true) |
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{ |
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4 |
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$this->eat(Token::TYPE_LSQUARE_BRACE); |
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294
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4 |
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$list = []; |
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295
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4 |
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while (!$this->match(Token::TYPE_RSQUARE_BRACE) && !$this->end()) { |
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4 |
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$list[] = $this->parseListValue(); |
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297
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298
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3 |
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if ($this->lookAhead->getType() != Token::TYPE_RSQUARE_BRACE) { |
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3 |
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$this->expect(Token::TYPE_COMMA); |
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3 |
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} |
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3 |
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} |
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3 |
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$this->expect(Token::TYPE_RSQUARE_BRACE); |
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3 |
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return $createType ? new InputList($list) : $list; |
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} |
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307
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308
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5 |
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protected function parseListValue() |
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309
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{ |
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310
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5 |
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switch ($this->lookAhead->getType()) { |
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5 |
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case Token::TYPE_NUMBER: |
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4 |
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return $this->expect(Token::TYPE_NUMBER)->getData(); |
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4 |
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case Token::TYPE_STRING: |
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315
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2 |
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return $this->expect(Token::TYPE_STRING)->getData(); |
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316
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4 |
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case Token::TYPE_LBRACE: |
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318
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1 |
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return $this->parseObject(false); |
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319
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320
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4 |
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case Token::TYPE_LSQUARE_BRACE: |
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321
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1 |
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return $this->parseList(false); |
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322
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3 |
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case Token::TYPE_TRUE: |
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324
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1 |
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return $this->expect(Token::TYPE_TRUE)->getData(); |
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325
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|
|
326
|
3 |
|
case Token::TYPE_FALSE: |
|
327
|
1 |
|
return $this->expect(Token::TYPE_FALSE)->getData(); |
|
328
|
|
|
|
|
329
|
3 |
|
case Token::TYPE_NULL: |
|
330
|
2 |
|
return $this->expect(Token::TYPE_NULL)->getData(); |
|
331
|
|
|
|
|
332
|
1 |
|
case Token::TYPE_IDENTIFIER: |
|
333
|
|
|
return $this->expect(Token::TYPE_IDENTIFIER)->getData(); |
|
334
|
1 |
|
} |
|
335
|
|
|
|
|
336
|
1 |
|
throw new SyntaxErrorException('Can\'t parse argument'); |
|
337
|
|
|
} |
|
338
|
|
|
|
|
339
|
2 |
|
protected function parseObject($createType = true) |
|
340
|
|
|
{ |
|
341
|
2 |
|
$this->eat(Token::TYPE_LBRACE); |
|
342
|
|
|
|
|
343
|
2 |
|
$object = []; |
|
344
|
2 |
|
while (!$this->match(Token::TYPE_RBRACE) && !$this->end()) { |
|
345
|
2 |
|
$key = $this->expectMulti([Token::TYPE_STRING, Token::TYPE_IDENTIFIER])->getData(); |
|
346
|
2 |
|
$this->expect(Token::TYPE_COLON); |
|
347
|
2 |
|
$value = $this->parseListValue(); |
|
348
|
|
|
|
|
349
|
2 |
|
if ($this->peek()->getType() != Token::TYPE_RBRACE) { |
|
350
|
2 |
|
$this->expect(Token::TYPE_COMMA); |
|
351
|
2 |
|
} |
|
352
|
|
|
|
|
353
|
2 |
|
$object[$key] = $value; |
|
354
|
2 |
|
} |
|
355
|
|
|
|
|
356
|
1 |
|
$this->eat(Token::TYPE_RBRACE); |
|
357
|
|
|
|
|
358
|
1 |
|
return $createType ? new InputObject($object) : $object; |
|
359
|
|
|
} |
|
360
|
|
|
|
|
361
|
3 |
|
protected function parseFragment() |
|
362
|
|
|
{ |
|
363
|
3 |
|
$this->lex(); |
|
364
|
3 |
|
$name = $this->parseIdentifier(); |
|
365
|
|
|
|
|
366
|
3 |
|
$this->eat(Token::TYPE_ON); |
|
367
|
|
|
|
|
368
|
3 |
|
$model = $this->parseIdentifier(); |
|
369
|
3 |
|
$fields = $this->parseBody(); |
|
370
|
|
|
|
|
371
|
3 |
|
return new Fragment($name, $model, $fields); |
|
372
|
|
|
} |
|
373
|
|
|
|
|
374
|
44 |
|
protected function eat($type) |
|
375
|
|
|
{ |
|
376
|
44 |
|
if ($this->match($type)) { |
|
377
|
22 |
|
return $this->lex(); |
|
378
|
|
|
} |
|
379
|
|
|
|
|
380
|
43 |
|
return null; |
|
381
|
|
|
} |
|
382
|
|
|
|
|
383
|
18 |
|
protected function eatMulti($types) |
|
384
|
|
|
{ |
|
385
|
18 |
|
if ($this->matchMulti($types)) { |
|
386
|
16 |
|
return $this->lex(); |
|
387
|
|
|
} |
|
388
|
|
|
|
|
389
|
2 |
|
return null; |
|
390
|
|
|
} |
|
391
|
|
|
|
|
392
|
42 |
|
protected function matchMulti($types) |
|
393
|
|
|
{ |
|
394
|
42 |
|
foreach ($types as $type) { |
|
395
|
42 |
|
if ($this->peek()->getType() == $type) { |
|
396
|
42 |
|
return true; |
|
397
|
|
|
} |
|
398
|
9 |
|
} |
|
399
|
|
|
|
|
400
|
4 |
|
return false; |
|
401
|
|
|
} |
|
402
|
|
|
|
|
403
|
45 |
|
protected function match($type) |
|
404
|
|
|
{ |
|
405
|
45 |
|
return $this->peek()->getType() === $type; |
|
406
|
|
|
} |
|
407
|
|
|
} |
|
408
|
|
|
|
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.