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<?php declare(strict_types=1);
namespace GraphQL\Language;
/**
* Represents a range of characters represented by a lexical token
* within a Source.
*
* @see \GraphQL\Tests\Language\TokenTest
*/
class Token
{
// Each kind of token.
public const SOF = '<SOF>';
public const EOF = '<EOF>';
public const BANG = '!';
public const DOLLAR = '$';
public const AMP = '&';
public const PAREN_L = '(';
public const PAREN_R = ')';
public const SPREAD = '...';
public const COLON = ':';
public const EQUALS = '=';
public const AT = '@';
public const BRACKET_L = '[';
public const BRACKET_R = ']';
public const BRACE_L = '{';
public const PIPE = '|';
public const BRACE_R = '}';
public const NAME = 'Name';
public const INT = 'Int';
public const FLOAT = 'Float';
public const STRING = 'String';
public const BLOCK_STRING = 'BlockString';
public const COMMENT = 'Comment';
/** The kind of Token (see one of constants above). */
public string $kind;
/** The character offset at which this Node begins. */
public int $start;
/** The character offset at which this Node ends. */
public int $end;
/** The 1-indexed line number on which this Token appears. */
public int $line;
/** The 1-indexed column number at which this Token begins. */
public int $column;
public ?string $value;
/**
* Tokens exist as nodes in a double-linked-list amongst all tokens
* including ignored tokens. <SOF> is always the first node and <EOF>
* the last.
*/
public ?Token $prev;
public ?Token $next = null;
public function __construct(string $kind, int $start, int $end, int $line, int $column, ?Token $previous = null, ?string $value = null)
{
$this->kind = $kind;
$this->start = $start;
$this->end = $end;
$this->line = $line;
$this->column = $column;
$this->prev = $previous;
$this->value = $value;
}
public function getDescription(): string
{
return $this->kind
. ($this->value === null
? ''
: " \"{$this->value}\"");
}
/**
* @return array{
* kind: string,
* value: string|null,
* line: int,
* column: int,
* }
*/
public function toArray(): array
{
return [
'kind' => $this->kind,
'value' => $this->value,
'line' => $this->line,
'column' => $this->column,
];
}
}