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JsonGetField.php
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JsonGetField.php
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<?php
declare(strict_types=1);
namespace Pfilsx\PostgreSQLDoctrine\ORM\Query\AST\Functions;
use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\AST\Node;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\Parser;
use Doctrine\ORM\Query\SqlWalker;
/**
* Implementation of PostgreSql JSON(B) object field retrieval by path.
*
* @see https://www.postgresql.org/docs/current/functions-json.html
*
* @example JSON_GET_FIELD(entity.field, 'a', 'b')
*/
class JsonGetField extends FunctionNode
{
protected Node $field;
/**
* @var Node[]
*/
protected array $path = [];
public function parse(Parser $parser): void
{
$parser->match(Lexer::T_IDENTIFIER);
$parser->match(Lexer::T_OPEN_PARENTHESIS);
$this->field = $parser->StringPrimary();
$parser->match(Lexer::T_COMMA);
$this->path[] = $parser->StringPrimary();
if (!$parser->getLexer()->isNextToken(Lexer::T_CLOSE_PARENTHESIS)) {
while ($parser->getLexer()->isNextToken(Lexer::T_COMMA)) {
$parser->match(Lexer::T_COMMA);
$this->path[] = $parser->StringPrimary();
}
}
$parser->match(Lexer::T_CLOSE_PARENTHESIS);
}
public function getSql(SqlWalker $sqlWalker): string
{
return sprintf(
'%s->%s',
$this->field->dispatch($sqlWalker),
implode(
'->',
array_map(static fn (Node $node) => $node->dispatch($sqlWalker), $this->path)
)
);
}
}