1: <?php
 2: 
 3: namespace Demo;
 4: 
 5: use \BN\Compiler\EvaluatorResponder;
 6: use BN\Compiler\Postfix\Operands\OperandsSummary;
 7: 
 8: class Presenter implements EvaluatorResponder
 9: {
10:     private $model;
11:     private $statementsCount;
12: 
13:     public function __construct(Model $model)
14:     {
15:         $this->model = $model;
16:         $this->statementsCount = 0;
17:     }
18: 
19:     public function nextStatement($statement)
20:     {
21:         $this->statementsCount++;
22:     }
23: 
24:     public function unknownToken($token)
25:     {
26:         $this->addError("Unknown lexeme <strong>{$token}</strong>");
27:     }
28: 
29:     public function unknownOperator($operator)
30:     {
31:         $this->addError("Undefined operator <strong>{$operator}</strong>");
32:     }
33: 
34:     public function mismatchedBrackets($mismatchedBracket)
35:     {
36:         $this->addError("Mismatched bracket <strong>{$mismatchedBracket}</strong>");
37:     }
38: 
39:     public function invalidOperands($operatorSymbol, OperandsSummary $operands)
40:     {
41:         $this->addError(
42:             "Operator <strong>{$operatorSymbol}</strong> must have <strong>{$operands->expectedCount}</strong>, " .
43:             "but had <strong>{$operands->countOperands()}</strong> operands"
44:         );
45:     }
46: 
47:     public function missingOperator($expectedOperandsCount)
48:     {
49:         $this->addError("Missing operator with <strong>{$expectedOperandsCount}</strong> operands");
50:     }
51: 
52:     public function undefinedVariable($variableName)
53:     {
54:         $this->addError("Undefined variable <strong>{$variableName}</strong>");
55:     }
56: 
57:     public function exception(\Exception $e)
58:     {
59:         $class = get_class($e);
60:         $this->addError(
61:             "<strong>{$class}</strong> in file <strong>{$e->getFile()}</strong> " .
62:             "on line <strong>{$e->getLine()}</strong>"
63:         );
64:     }
65: 
66:     private function addError($errorMessage)
67:     {
68:         $this->model->error .= "<em>{$this->statementsCount}:</em> {$errorMessage}\n";
69:     }
70: 
71:     public function result($result)
72:     {
73:         $this->model->result = $result;
74:     }
75: 
76:     public function variables(\stdClass $variables)
77:     {
78:         foreach (get_object_vars($variables) as $name => $value) {
79:             $this->model->variables[] = "\${$name} = {$value}";
80:         }
81:     }
82: }
83: