From 5e7629184d97a17b35ff2bb14415c291fcd7b573 Mon Sep 17 00:00:00 2001
From: Evgeny Fadeev <evgeny.fadeev@gmail.com>
Date: Fri, 11 May 2012 12:01:52 -0400
Subject: parser for a simple category tree seems to work

---
 askbot/conf/flatpages.py |  4 ++--
 askbot/views/writers.py  | 62 +++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 58 insertions(+), 8 deletions(-)

diff --git a/askbot/conf/flatpages.py b/askbot/conf/flatpages.py
index 6879e27c..543da67d 100644
--- a/askbot/conf/flatpages.py
+++ b/askbot/conf/flatpages.py
@@ -58,7 +58,7 @@ settings.register(#this field is not editable manually
         FLATPAGES,
         'CATEGORY_TREE',
         description = 'Category tree',#no need to translate
-        default = '[[]]',#empty array of arrays in json
-        hidden = True
+        default = '',#empty array of arrays in json
+        #hidden = True
     )
 )
diff --git a/askbot/views/writers.py b/askbot/views/writers.py
index d4dea8f0..4fcdf81c 100644
--- a/askbot/views/writers.py
+++ b/askbot/views/writers.py
@@ -260,11 +260,66 @@ def ask(request):#view used to ask a new question
         'is_anonymous': request.REQUEST.get('is_anonymous', False),
     }
 
+    def get_subtree(tree, path):
+        if len(path) == 1:
+            assert(path[0] == 0)
+            return tree
+        else:
+            import copy
+            parent_path = copy.copy(path)
+            leaf_index = parent_path.pop()
+            branch_index = parent_path[-1]
+            parent_tree = get_subtree(tree, parent_path)
+            return parent_tree[branch_index][1]
+
+    def parse_tree(text):
+        """parse tree represented as indented text
+        one item per line, with two spaces per level of indentation
+        """
+        lines = text.split('\n')
+        import re
+        in_re = re.compile(r'^([ ]*)')
+
+        tree = [['dummy', []]]
+        subtree_path = [0]
+        clevel = 0
+
+        for line in lines:
+            if line.strip() == '':
+                continue
+            match = in_re.match(line)
+            level = len(match.group(1))/2 + 1
+
+            if level > clevel:
+                import pdb
+                pdb.set_trace()
+                subtree_path.append(0)#
+            elif level < clevel:
+                subtree_path = subtree_path[:level+1]
+                leaf_index = subtree_path.pop()
+                subtree_path.append(leaf_index + 1)
+            else:
+                leaf_index = subtree_path.pop()
+                subtree_path.append(leaf_index + 1)
+
+            clevel = level
+            try:
+                subtree = get_subtree(tree, subtree_path)
+            except:
+                return tree
+            subtree.append([line.strip(), []])
+
+        return tree
+
+
     if askbot_settings.TAG_SOURCE == 'category-tree':
-        category_tree_data = askbot_settings.CATEGORY_TREE
+        cat_tree = parse_tree(askbot_settings.CATEGORY_TREE)
+        category_tree_data = simplejson.dumps(cat_tree)
     else:
         category_tree_data = None
 
+    """
+    example of desired structure
     cat_tree = [
         ['dummy', 
             [
@@ -286,11 +341,6 @@ def ask(request):#view used to ask a new question
         ]
     ]
     """
-    cat_tree = [
-        ['dummy', []]
-    ]
-    """
-    category_tree_data = simplejson.dumps(cat_tree)
         
     data = {
         'active_tab': 'ask',
-- 
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