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<?php
namespace GraphQL\Language;
use GraphQL\Utils\Utils;
/**
* Class Source
* @package GraphQL\Language
*/
class Source
{
/**
* @var string
*/
public $body;
/**
* @var int
*/
public $length;
/**
* @var string
*/
public $name;
/**
* @var SourceLocation
*/
public $locationOffset;
/**
* Source constructor.
*
* A representation of source input to GraphQL.
* `name` and `locationOffset` are optional. They are useful for clients who
* store GraphQL documents in source files; for example, if the GraphQL input
* starts at line 40 in a file named Foo.graphql, it might be useful for name to
* be "Foo.graphql" and location to be `{ line: 40, column: 0 }`.
* line and column in locationOffset are 1-indexed
*
* @param string $body
* @param string|null $name
* @param SourceLocation|null $location
*/
public function __construct($body, $name = null, SourceLocation $location = null)
{
Utils::invariant(
is_string($body),
'GraphQL query body is expected to be string, but got ' . Utils::getVariableType($body)
);
$this->body = $body;
$this->length = mb_strlen($body, 'UTF-8');
$this->name = $name ?: 'GraphQL request';
$this->locationOffset = $location ?: new SourceLocation(1, 1);
Utils::invariant(
$this->locationOffset->line > 0,
'line in locationOffset is 1-indexed and must be positive'
);
Utils::invariant(
$this->locationOffset->column > 0,
'column in locationOffset is 1-indexed and must be positive'
);
}
/**
* @param $position
* @return SourceLocation
*/
public function getLocation($position)
{
$line = 1;
$column = $position + 1;
$utfChars = json_decode('"\u2028\u2029"');
$lineRegexp = '/\r\n|[\n\r'.$utfChars.']/su';
$matches = [];
preg_match_all($lineRegexp, mb_substr($this->body, 0, $position, 'UTF-8'), $matches, PREG_OFFSET_CAPTURE);
foreach ($matches[0] as $index => $match) {
$line += 1;
$column = $position + 1 - ($match[1] + mb_strlen($match[0], 'UTF-8'));
}
return new SourceLocation($line, $column);
}
}