Added possibility to add new expander definitions

Author: norberttech

src/Coduo/PHPMatcher/Exception/UnknownExpanderClassException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Coduo\PHPMatcher\Exception;
+
+class UnknownExpanderClassException extends Exception
+{
+}

src/Coduo/PHPMatcher/Parser.php

@@ -6,6 +6,7 @@
 use Coduo\PHPMatcher\Exception\Exception;
 use Coduo\PHPMatcher\Exception\InvalidExpanderTypeException;
 use Coduo\PHPMatcher\Exception\PatternException;
+use Coduo\PHPMatcher\Exception\UnknownExpanderClassException;
 use Coduo\PHPMatcher\Exception\UnknownExpanderException;
 use Coduo\PHPMatcher\Matcher\Pattern;
 
@@ -77,6 +78,20 @@ public function getAST($pattern)
         return $this->getPattern();
     }
 
+    /**
+     * @param $expanderName
+     * @param $expanderFQCN Fully-Qualified Class Name that implements PatternExpander interface
+     * @throws UnknownExpanderClassException
+     */
+    public function addExpanderDefinition($expanderName, $expanderFQCN)
+    {
+        if (!class_exists($expanderFQCN)) {
+            throw new UnknownExpanderClassException(sprintf("Class \"%s\" does not exists.", $expanderFQCN));
+        }
+
+        $this->expanderDefinitions[$expanderName] = $expanderFQCN;
+    }
+
     /**
      * Create AST root
      *

tests/Coduo/PHPMatcher/Matcher/StringMatcherTest.php

@@ -15,7 +15,8 @@ class StringMatcherTest extends \PHPUnit_Framework_TestCase
 
     public function setUp()
     {
-        $this->matcher = new StringMatcher(new Parser(new Lexer()));
+        $parser = new Parser(new Lexer());
+        $this->matcher = new StringMatcher($parser);
     }
     /**
      * @dataProvider positiveCanMatchData