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<?php
namespace Illuminate\Database;
use Illuminate\Database\Query\Expression;
abstract class Grammar
{
/**
* The grammar table prefix.
*
* @var string
*/
protected $tablePrefix = '';
/**
* Wrap an array of values.
*
* @param array $values
* @return array
*/
public function wrapArray(array $values)
{
return array_map([$this, 'wrap'], $values);
}
/**
* Wrap a table in keyword identifiers.
*
* @param \Illuminate\Database\Query\Expression|string $table
* @return string
*/
public function wrapTable($table)
{
if (! $this->isExpression($table)) {
return $this->wrap($this->tablePrefix.$table, true);
}
return $this->getValue($table);
}
/**
* Wrap a value in keyword identifiers.
*
* @param \Illuminate\Database\Query\Expression|string $value
* @param bool $prefixAlias
* @return string
*/
public function wrap($value, $prefixAlias = false)
{
if ($this->isExpression($value)) {
return $this->getValue($value);
}
// If the value being wrapped has a column alias we will need to separate out
// the pieces so we can wrap each of the segments of the expression on it
// own, and then joins them both back together with the "as" connector.
if (strpos(strtolower($value), ' as ') !== false) {
return $this->wrapAliasedValue($value, $prefixAlias);
}
return $this->wrapSegments(explode('.', $value));
}
/**
* Wrap a value that has an alias.
*
* @param string $value
* @param bool $prefixAlias
* @return string
*/
protected function wrapAliasedValue($value, $prefixAlias = false)
{
$segments = preg_split('/\s+as\s+/i', $value);
// If we are wrapping a table we need to prefix the alias with the table prefix
// as well in order to generate proper syntax. If this is a column of course
// no prefix is necessary. The condition will be true when from wrapTable.
if ($prefixAlias) {
$segments[1] = $this->tablePrefix.$segments[1];
}
return $this->wrap(
$segments[0]).' as '.$this->wrapValue($segments[1]
);
}
/**
* Wrap the given value segments.
*
* @param array $segments
* @return string
*/
protected function wrapSegments($segments)
{
return collect($segments)->map(function ($segment, $key) use ($segments) {
return $key == 0 && count($segments) > 1
? $this->wrapTable($segment)
: $this->wrapValue($segment);
})->implode('.');
}
/**
* Wrap a single string in keyword identifiers.
*
* @param string $value
* @return string
*/
protected function wrapValue($value)
{
if ($value !== '*') {
return '"'.str_replace('"', '""', $value).'"';
}
return $value;
}
/**
* Convert an array of column names into a delimited string.
*
* @param array $columns
* @return string
*/
public function columnize(array $columns)
{
return implode(', ', array_map([$this, 'wrap'], $columns));
}
/**
* Create query parameter place-holders for an array.
*
* @param array $values
* @return string
*/
public function parameterize(array $values)
{
return implode(', ', array_map([$this, 'parameter'], $values));
}
/**
* Get the appropriate query parameter place-holder for a value.
*
* @param mixed $value
* @return string
*/
public function parameter($value)
{
return $this->isExpression($value) ? $this->getValue($value) : '?';
}
/**
* Determine if the given value is a raw expression.
*
* @param mixed $value
* @return bool
*/
public function isExpression($value)
{
return $value instanceof Expression;
}
/**
* Get the value of a raw expression.
*
* @param \Illuminate\Database\Query\Expression $expression
* @return string
*/
public function getValue($expression)
{
return $expression->getValue();
}
/**
* Get the format for database stored dates.
*
* @return string
*/
public function getDateFormat()
{
return 'Y-m-d H:i:s';
}
/**
* Get the grammar's table prefix.
*
* @return string
*/
public function getTablePrefix()
{
return $this->tablePrefix;
}
/**
* Set the grammar's table prefix.
*
* @param string $prefix
* @return $this
*/
public function setTablePrefix($prefix)
{
$this->tablePrefix = $prefix;
return $this;
}
}
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