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logic-gate

Description:

With LogicGate you can define an evaluable-logic-tree then evaluate a value or filter an array. This could be useful when you need to do one or more complex filters. A LogicRoot object has one o more LogicGate (or any object that implements iEvaluable interface, even another LogicRoot object) objects. You can evaluate a single LogicGate object too.

Use:

LogicGate Operators

There are ford operators allowed:

• LogicGate::OP_EQ (=)
• LogicGate::OP_GT (>)
• LogicGate::OP_LT (<)
• LogicGate::OP_REGEX (~) You can add LogicGate::OP_NOT (!) Before it to negate condition. You can use a callable object instead an operator

Examples

//Using '!='
$gate1 = new LogicGate(4,LogicGate::OP_NOT . LogicGate::OP_EQ);
$gate1->test(1); //true
$gate1->test(4); //false

//Using '>' in a array
$gate2 = new LogicGate(18,LogicGate::OP_GT);
$arr_filtered = $gate2->filter([21,3,33]); // [0=>21,2=>33]

//Using a function
//the function must have two arguments:
// - the value to check
// - value of gate
$fx = function($val, $ref) { return $val->prop1 == $ref;};
$gate3 = new LogicGate(5,$fx);
$gate3->test((object)['prop1'=>5]); //true

How to use

• You can define a RootGate (tree) with three different ways:
  • Using methods 'addAND' and 'addOR'
  • Using an array.
  • Using a string.

Using 'add' methods

That is the best way for a healthy order and to do some branches with some different conditions.
You can add a LogicGate or a LogicGateRoot (or any class that implement iIsEvaluable)

Example

 //two-digit number greater than 45 or one-digit number greater than five       
        $gatesRoot = new LogicGatesRoot();
        $gatesRoot->addAND (new LogicGate('^\\d\\d$', LogicGate::OP_REGEX));
        $gatesRoot->addAND (new LogicGate(45, LogicGate::OP_GT));
        $gatesRoot->addOR(new LogicGate(5, LogicGate::OP_GT));
        $gatesRoot->addAND(new LogicGate('^\\d$', LogicGate::OP_REGEX));
        $gatesRoot->filter([11,8,178,88,97]); //[1=>8,3=>88,4=>97]

        $gatesRoot2 = new LogicGatesRoot();
        $gatesRoot2->addAND (new LogicGate('^8', LogicGate::OP_REGEX));
        $gatesRoot2->addAND ($gatesRoot);
        $gatesRoot2->filter([11,8,178,88,97]); //[1=>8,3=>88]

Using an array

If you have an array with conditions you can make the tree using it.
The keys are:

• operator (optional) default regex
• value (required): value of reference
• next_gate (required) (OR/AND)

Example

 $fx = function ($el, $ref) { return $el %2 ==0;};
        $arr = [
            ['value' => '^\\d+$', 'next_gate' => 'AND'] ,
            ['operator' => $fx, 'value' => null, 'next_gate' => 'OR'] ,
            ['operator' => LogicGate::OP_GT, 'value' => 60, 'next_gate' => 'anything']
        ];
        $gate = new LogicGatesRoot($arr);
        $gate->test(61);//true
        $gate->test(6);//true
        $gate->test(57);//false

Using an string

the minimalist mode to make a complex tree is with a strong query.

The rules are:

• {:operator}:"{:value}" {AND/OR}
• support parenthesis query
• operator can be <,>,=,~ or a name function.
• use char prefix ! to negate condition (not operator)
• value only can be a string

Example

        //(~:"2$" OR ~:"comodin) AND (~:"1" OR =:"comodin21") AND !=:"comodin12"
        //(finish with two or contains "comodin") and (contains 1 OR is equal "comodin21")
        $lg = new LogicGatesRoot('(' . LogicGate::OP_REGEX . ':"2$" OR ' . LogicGate::OP_REGEX . ':"comodin") '.
            'AND (' . LogicGate::OP_REGEX . ':"1" OR ' . LogicGate::OP_EQ . ':"comodin23") AND '
            . LogicGate::OP_NOT .  LogicGate::OP_EQ . ':"comodin211"');

        $lg->test('comodin21'); //true
        $lg->test('comodin22'); //false
        $lg->test('comodin12'); //false
        $lg->test('comodin103'); //true
        $lg->test('12'); //true
        $lg->test('comodin211'); //false

Examples

• See TestCases for more examples.