Issues hoaproject#41 Add errors when assert operators.

When operators are evaluated, we can found some asserter false. This
patch add a management of errors in the asserter. Operators name and
value is added in errors stack to identify which operator fail.

Two methods are available to identify if we have errors and to get there
errors:
* hasErrors return a boolean which identify if some errors have been
raised.
* getErrors return an array with operator name as key and arguments as
values.

Test/Unit/Visitor/Asserter.php

@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * Hoa
+ *
+ *
+ * @license
+ *
+ * New BSD License
+ *
+ * Copyright © 2007-2015, Ivan Enderlin. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the Hoa nor the names of its contributors may be
+ *       used to endorse or promote products derived from this software without
+ *       specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace Hoa\Ruler\Test\Unit\Model;
+
+use Hoa\Test;
+use Hoa\Ruler as LUT;
+
+/**
+ * Class \Hoa\Ruler\Test\Unit\Model\Asserter.
+ *
+ * Test suite of the asserter object of the visitor.
+ *
+ * @author     Alexis von Glasow <[email protected]>
+ * @copyright  Copyright © 2007-2015 Alexis von Glasow.
+ * @license    New BSD License
+ */
+
+class Asserter extends Test\Unit\Suite {
+
+    public function case_keep_errors ( ) {
+        $this
+            ->given(
+                $ruler     = new LUT(),
+                $fExecuted = false,
+                $asserter  = $ruler->getDefaultAsserter(),
+                $asserter->setOperator(
+                    'f',
+                    function ( $a = false ) use ( &$fExecuted ) {
+
+                        $fExecuted = true;
+
+                        return $a;
+                    }
+                ),
+                $rule = 'f(false)'
+            )
+            ->when($result = $ruler->assert($rule, new LUT\Context()))
+            ->then
+                ->boolean($result)
+                    ->isFalse()
+                ->boolean($fExecuted)
+                    ->isTrue()
+                ->boolean($asserter->hasError())
+                    ->isTrue()
+                ->array($asserter->getErrors())
+                    ->isNotEmpty()
+                    ->hasKey('f')
+            ;
+    }
+}
+

Visitor/Asserter.php

@@ -67,6 +67,13 @@ class Asserter implements Visitor\Visit {
      */
     protected $_operators = [];
 
+    /**
+     * List of errors.
+     *
+     * @var \Hoa\Ruler\Visitor\Asserter array
+     */
+    protected $errors = [];
+
 
 
     /**
@@ -159,6 +166,10 @@ protected function visitOperator ( Ruler\Model\Operator $element, &$handle = nul
             $value       = $argument->accept($this, $handle, $eldnah);
             $arguments[] = $value;
 
+            // Add operators name and their values in errors lists
+            if (false === $value)
+                $this->errors[$element->getName()] = $element->getArguments();
+
             if($element::LAZY_BREAK === $element->shouldBreakLazyEvaluation($value))
                 break;
         }
@@ -487,4 +498,26 @@ public function getOperators ( ) {
 
         return $this->_operators;
     }
+
+    /**
+     * Get all errors.
+     *
+     * @access  public
+     * @return  array
+     */
+    public function getErrors ( ) {
+
+        return $this->errors;
+    }
+
+    /**
+     * The evaluation of operators has it raised errors.
+     *
+     * @access  public
+     * @return  boolean
+     */
+    public function hasError ( ) {
+
+        return !empty($this->errors);
+    }
 }