From deda0fc4681a4d05161bede9cb5bc190b941a8a5 Mon Sep 17 00:00:00 2001
From: Schmouk <ph.schmouker@yahoo.fr>
Date: Thu, 14 Feb 2019 14:58:00 +0100
Subject: [PATCH 1/2] #77-Syntaxic Intermediate Code implementation

Augmented doucmentation comment in module `fe_ictree.py`.
---
 src/FrontEnd/IntermediateCode/fe_ictree.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/FrontEnd/IntermediateCode/fe_ictree.py b/src/FrontEnd/IntermediateCode/fe_ictree.py
index ac370b8..591720c 100644
--- a/src/FrontEnd/IntermediateCode/fe_ictree.py
+++ b/src/FrontEnd/IntermediateCode/fe_ictree.py
@@ -30,5 +30,7 @@
 FEICTree = FEICBlock
 """
 The class of Intermediate Code Trees.
+Well, Intermediate Code trees are only defined by their `root`.
 """
+
 #=====   end of   FrontEnd.IntermediateCode.fe_ictree   =====#

From 7f3d83fc95e1924c30e4fb424e31c3d9d1ad4ae5 Mon Sep 17 00:00:00 2001
From: Schmouk <ph.schmouker@yahoo.fr>
Date: Thu, 14 Feb 2019 15:56:52 +0100
Subject: [PATCH 2/2] #77-Syntaxic Intermediate Code implementation

Corrected module `FrontEnd/IntermediateCode/fe_ictree.py`.
---
 src/FrontEnd/IntermediateCode/fe_icblock.py |  1 -
 src/FrontEnd/IntermediateCode/fe_icleaf.py  |  7 ++++
 src/FrontEnd/IntermediateCode/fe_icnode.py  |  9 ++++-
 src/FrontEnd/IntermediateCode/fe_ictree.py  | 43 ++++++++++++++++++---
 4 files changed, 53 insertions(+), 7 deletions(-)

diff --git a/src/FrontEnd/IntermediateCode/fe_icblock.py b/src/FrontEnd/IntermediateCode/fe_icblock.py
index 5d7f5c7..9f8c282 100644
--- a/src/FrontEnd/IntermediateCode/fe_icblock.py
+++ b/src/FrontEnd/IntermediateCode/fe_icblock.py
@@ -31,7 +31,6 @@ class FEICBlock( FEICNode ):
     def __init__(self, parent:FEICNode=None):
         '''
         Constructor.
-
         '''
         super().__init__( [] )  ## content is an empty list (of FEICNode-s)
         self.parent = parent
diff --git a/src/FrontEnd/IntermediateCode/fe_icleaf.py b/src/FrontEnd/IntermediateCode/fe_icleaf.py
index 3dce388..fa1303a 100644
--- a/src/FrontEnd/IntermediateCode/fe_icleaf.py
+++ b/src/FrontEnd/IntermediateCode/fe_icleaf.py
@@ -40,6 +40,13 @@ def __init__(self, content):
             content: a reference to the content opf this leaf
         '''
         super().__init__( content )
+    
+    #-------------------------------------------------------------------------
+    def set_parent(self, parent:FEICNode):
+        '''
+        Sets the parent of this node.
+        '''
+        pass
 
     #-------------------------------------------------------------------------
     def walk(self) -> FEICNode:
diff --git a/src/FrontEnd/IntermediateCode/fe_icnode.py b/src/FrontEnd/IntermediateCode/fe_icnode.py
index 2daa75b..49e95e1 100644
--- a/src/FrontEnd/IntermediateCode/fe_icnode.py
+++ b/src/FrontEnd/IntermediateCode/fe_icnode.py
@@ -40,7 +40,14 @@ def __init__(self, content=None):
         self.content = content
 
     #-------------------------------------------------------------------------
-    def walk(self) -> FEICNodeI:
+    def set_parent(self, parent:FEICNode):
+        '''
+        Sets the parent of this node.
+        '''
+        self.parent = parent
+
+    #-------------------------------------------------------------------------
+    def walk(self) -> FEICNode:
         '''
         Walks through the list of nodes contained within this block.
         Walk-through is depth-first implemented.
diff --git a/src/FrontEnd/IntermediateCode/fe_ictree.py b/src/FrontEnd/IntermediateCode/fe_ictree.py
index 591720c..1583dda 100644
--- a/src/FrontEnd/IntermediateCode/fe_ictree.py
+++ b/src/FrontEnd/IntermediateCode/fe_ictree.py
@@ -24,13 +24,46 @@
 
 #=============================================================================
 from FrontEnd.IntermediateCode.fe_icblock import FEICBlock 
+from FrontEnd.IntermediateCode.fe_icnode  import FEICNode 
 
 
 #=============================================================================
-FEICTree = FEICBlock
-"""
-The class of Intermediate Code Trees.
-Well, Intermediate Code trees are only defined by their `root`.
-"""
+class FEICTree:
+    """
+    The class of Intermediate Code trees.
+    """
+
+    #-------------------------------------------------------------------------
+    def __init__(self):
+        '''
+        Constructor.
+        '''
+        self._root = FEICBlock()
+        self._current = self._root
+
+    #-------------------------------------------------------------------------
+    def __iadd__(self, ic_node:(FEICBlock,FEICNode)):
+        '''
+        Appends a new node into this block.
+        '''
+        ic_node.set_parent( self._current )
+        self._current += ic_node
+        if isinstance( ic_node, FEICBlock ):
+            self._current = ic_node
+
+    #-------------------------------------------------------------------------
+    def up(self):
+        '''
+        Goes back to parent block in IC Tree.
+        '''
+        self._current = self._current.parent
+
+    #-------------------------------------------------------------------------
+    def walk(self):
+        '''
+        Walks through this Intermediate Code tree.
+        Walk-through is depth-first implemented.
+        '''
+        self._root.walk()
 
 #=====   end of   FrontEnd.IntermediateCode.fe_ictree   =====#