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81 lines (75 loc) · 2.15 KB
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<?php
/**
* Defines a component that is later extended to parse specialized components or
* keywords.
*
* There is a small difference between *Component and *Keyword classes: usually,
* *Component parsers can be reused in multiple situations and *Keyword parsers
* count on the *Component classes to do their job.
*
* @package SqlParser
*/
namespace SqlParser;
require_once 'common.php';
/**
* A component (of a statement) is a part of a statement that is common to
* multiple query types.
*
* @category Components
* @package SqlParser
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
*/
abstract class Component
{
/**
* Parses the tokens contained in the given list in the context of the given
* parser.
*
* @param Parser $parser The parser that serves as context.
* @param TokensList $list The list of tokens that are being parsed.
* @param array $options Parameters for parsing.
*
* @throws \Exception Not implemented yet.
*
* @return mixed
*/
public static function parse(
Parser $parser,
TokensList $list,
array $options = array()
) {
// This method should be abstract, but it can't be both static and
// abstract.
throw new \Exception(\__('Not implemented yet.'));
}
/**
* Builds the string representation of a component of this type.
*
* In other words, this function represents the inverse function of
* `static::parse`.
*
* @param mixed $component The component to be built.
* @param array $options Parameters for building.
*
* @throws \Exception Not implemented yet.
*
* @return string
*/
public static function build($component, array $options = array())
{
// This method should be abstract, but it can't be both static and
// abstract.
throw new \Exception(\__('Not implemented yet.'));
}
/**
* Builds the string representation of a component of this type.
*
* @see static::build
*
* @return string
*/
public function __toString()
{
return static::build($this);
}
}