Add offset support

Author: SerafimArts

Llk/Parser.php

@@ -325,8 +325,11 @@ protected function _parse(Rule $zeRule, $next)
             }
 
             $namespace = $this->_tokenSequence->current()['namespace'];
+            $offset = $this->_tokenSequence->current()['offset'];
+
             $zzeRule   = clone $zeRule;
             $zzeRule->setValue($value);
+            $zzeRule->setOffset($offset);
             $zzeRule->setNamespace($namespace);
 
             if (isset($this->_tokens[$namespace][$name])) {
@@ -595,7 +598,9 @@ protected function _buildTree($i = 0, &$children = [])
                     'token'     => $trace->getTokenName(),
                     'value'     => $trace->getValue(),
                     'namespace' => $trace->getNamespace(),
+                    'offset'    => $trace->getOffset()
                 ]);
+
                 $children[] = $child;
                 ++$i;
             }

Llk/Rule/Token.php

@@ -105,7 +105,12 @@ class Token extends Rule
      */
     protected $_unification          = -1;
 
-
+    /**
+     * Token offset.
+     *
+     * @var int
+     */
+    protected $_offset               = 0;
 
     /**
      * Constructor.
@@ -237,6 +242,27 @@ public function getValue()
         return $this->_value;
     }
 
+    /**
+     * Set token offset.
+     *
+     * @param int $offset
+     * @return void
+     */
+    public function setOffset($offset)
+    {
+        $this->_offset = $offset;
+    }
+
+    /**
+     * Get token offset.
+     *
+     * @return int
+     */
+    public function getOffset()
+    {
+        return $this->_offset;
+    }
+
     /**
      * Set whether the token is kept or not in the AST.
      *

Llk/TreeNode.php

@@ -175,6 +175,19 @@ public function getValueToken()
                 : null;
     }
 
+    /**
+     * Get token offset.
+     *
+     * @return int
+     */
+    public function getOffset()
+    {
+        return
+            isset($this->_value['offset'])
+                ? $this->_value['offset']
+                : 0;
+    }
+
     /**
      * Get value value.
      *