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<?php
namespace YOOtheme\GraphQL\Language;
/**
* Represents a range of characters represented by a lexical token
* within a Source.
*/
class Token
{
// Each kind of token.
const SOF = '<SOF>';
const EOF = '<EOF>';
const BANG = '!';
const DOLLAR = '$';
const PAREN_L = '(';
const PAREN_R = ')';
const SPREAD = '...';
const COLON = ':';
const EQUALS = '=';
const AT = '@';
const BRACKET_L = '[';
const BRACKET_R = ']';
const BRACE_L = '{';
const PIPE = '|';
const BRACE_R = '}';
const NAME = 'Name';
const INT = 'Int';
const FLOAT = 'Float';
const STRING = 'String';
const BLOCK_STRING = 'BlockString';
const COMMENT = 'Comment';
/**
* The kind of Token (see one of constants above).
*
* @var string
*/
public $kind;
/**
* The character offset at which this Node begins.
*
* @var int
*/
public $start;
/**
* The character offset at which this Node ends.
*
* @var int
*/
public $end;
/**
* The 1-indexed line number on which this Token appears.
*
* @var int
*/
public $line;
/**
* The 1-indexed column number at which this Token begins.
*
* @var int
*/
public $column;
/**
* @var string|null
*/
public $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.
*
* @var Token
*/
public $prev;
/**
* @var Token
*/
public $next;
/**
* Token constructor.
* @param $kind
* @param $start
* @param $end
* @param $line
* @param $column
* @param Token $previous
* @param null $value
*/
public function __construct($kind, $start, $end, $line, $column, Token $previous = null, $value = null)
{
$this->kind = $kind;
$this->start = (int) $start;
$this->end = (int) $end;
$this->line = (int) $line;
$this->column = (int) $column;
$this->prev = $previous;
$this->next = null;
$this->value = $value;
}
/**
* @return string
*/
public function getDescription()
{
return $this->kind . ($this->value ? ' "' . $this->value . '"' : '');
}
/**
* @return array
*/
public function toArray()
{
return [
'kind' => $this->kind,
'value' => $this->value,
'line' => $this->line,
'column' => $this->column
];
}
}