Filter: Implement hasValue() & matchHasValue() helper methods

src/Filter.php

@@ -11,6 +11,8 @@
 use ipl\Stdlib\Filter\Equal;
 use ipl\Stdlib\Filter\GreaterThan;
 use ipl\Stdlib\Filter\GreaterThanOrEqual;
+use ipl\Stdlib\Filter\HasNotValue;
+use ipl\Stdlib\Filter\HasValue;
 use ipl\Stdlib\Filter\LessThan;
 use ipl\Stdlib\Filter\LessThanOrEqual;
 use ipl\Stdlib\Filter\None;
@@ -143,6 +145,43 @@ protected function matchNone(None $rules, $row)
         return true;
     }
 
+    /**
+     * Create a rule that applies rows with a column having any values, i.e. matches
+     * all rows where this column has been set
+     *
+     * Performs isset() | IS NOT NULL actions
+     *
+     * @param string $column
+     *
+     * @return HasValue
+     */
+    public static function hasValue($column)
+    {
+        return new HasValue($column, '');
+    }
+
+    /**
+     * Get whether the given rule's column contains any values
+     *
+     * @param HasValue|HasNotValue $rule
+     * @param object $row
+     *
+     * @return bool
+     */
+    protected function matchHasValue($rule, $row)
+    {
+        if (! $rule instanceof HasValue && ! $rule instanceof HasNotValue) {
+            throw new InvalidArgumentException(sprintf(
+                'Rule must be of type %s or %s, got %s instead',
+                HasValue::class,
+                HasNotValue::class,
+                get_php_type($rule)
+            ));
+        }
+
+        return ! empty($this->extractValue($rule->getColumn(), $row));
+    }
+
     /**
      * Create a rule that matches rows with a column that **equals** the given value
      *
@@ -408,6 +447,8 @@ protected function performMatch(Rule $rule, $row)
                 return $this->matchNone($rule, $row);
             case $rule instanceof Unequal:
                 return $this->matchUnequal($rule, $row);
+            case $rule instanceof HasValue:
+                return $this->matchHasValue($rule, $row);
             default:
                 throw new InvalidArgumentException(sprintf(
                     'Unable to match filter. Rule type %s is unknown',