1: <?php
 2: 
 3: namespace Alchemy\core\query;
 4: use Alchemy\core\Element;
 5: 
 6: 
 7: /**
 8:  * Represent a Scalar value in SQL
 9:  */
10: class Scalar extends Element implements IQueryValue {
11: 
12:     protected $value;
13: 
14: 
15:     /**
16:      * Object constructor
17:      *
18:      * @param mixed $value Value
19:      * @param mixed $tag   Optional. Tags will be inferred if not provided
20:      */
21:     public function __construct($value, $tag = null) {
22:         if (is_object($value)) {
23:             throw new \Exception("Cannot build Scalar from object " . get_class($value));
24:         }
25:         $this->value = $value;
26:         $this->addTag("expr.value", $tag ?: self::infer_type($value));
27:         $this->addTag("sql.compile", "Scalar");
28:     }
29: 
30: 
31:     public function parameters() {
32:         return array($this);
33:     }
34: 
35: 
36:     public function getDescription($maxdepth = 3, $curdepth = 0) {
37:         $str = parent::getDescription($maxdepth, $curdepth);
38:         return "$str ({$this->value})";
39:     }
40: 
41: 
42:     /**
43:      * Get the primitive value
44:      *
45:      * @param mixed
46:      */
47:     public function getValue() {
48:         return $this->value;
49:     }
50: 
51: 
52:     /**
53:      * Infer the type of a given value
54:      *
55:      * @param  mixed $value
56:      * @return string
57:      */
58:     protected static function infer_type($value) {
59:         static $types = array('boolean', 'integer', 'null', 'string');
60: 
61:         $type = strtolower(gettype($value));
62:         return in_array($type, $types) ? $type : 'string';
63:     }
64: }
65: