first version of selection calculation is ready

frontend/frontend/setup_tool.py

@@ -1,87 +1,128 @@
-
+I_TAGNAME = 0
+I_ATTRS = 1
+I_CHILDREN = 2
+I_PARENT = 3 # not in use
 
 def build_xpathes(item_tag_ids, html_json):
     shared_tag_stack = [];
 
-def build_parent_stack(html_json, tag_id):
+def _build_parent_stack(html_json, tag_id):
     tag_stack = []
 
     def walk_by_tag(tag):
-        if (tag[1]['tag-id'] == tag_id):
+        if (tag[I_ATTRS]['tag-id'] == tag_id):
             return True
         else:
-            for subtag in tag[2]:
+            for subtag in tag[I_CHILDREN]:
                 if walk_by_tag(subtag):
                     tag_stack.append(subtag)
                     return True
             return False
     
     walk_by_tag(html_json)
+    
+    tag_stack.append(html_json)
+    
     return list(reversed(tag_stack))
 
-def find_tags_by_tag_names(html_json, parent_tag_names):
+def _find_tags_by_tag_names(html_json, parent_tag_names):
+    tags = []
+    tag_stack = []
 
-    tag_ids = []
-
-    def walk_by_tag(tag):
-        depth = len(tag_ids)
-        if tag[0] == parent_tag_names[depth]:
+    def walk_by_tag(tag, depth):
+        tag_stack.append(tag)
+        if tag[I_TAGNAME] == parent_tag_names[depth]:
             if depth == len(parent_tag_names)-1: # is a tie
-                tag_ids.append(tag[1]['tag-id'])
-            elif depth < len(parent_tag_names):
-                for subtag in tag[2]:
-                    walk_by_tag(subtag)
-    return tag_ids
+                tags.append((tag, list(tag_stack)))
+            elif depth < len(parent_tag_names)-1:
+                for subtag in tag[I_CHILDREN]:
+                    walk_by_tag(subtag, depth+1)
+        tag_stack.pop()
+    walk_by_tag(html_json, 0)
+    return tags
 
 # allusion to xpath
 class PathItem:
     go_parent = False
-    go_child_tag = None
+    child_tag = None
     child_index = None
 
+    def __init__(self, go_parent=False, child_tag=None, child_index=None):
+        self.go_parent = go_parent
+        self.child_tag = child_tag
+        self.child_index = child_index
+
+    def __repr__(self):
+        return '..' if self.go_parent else '%s[%s]' % (self.child_tag, self.child_index+1)
+
+
 def _build_path(stack, target_stack):
     fork = None
     for fork_i in xrange(0, len(stack)):
         if stack[fork_i] == target_stack[fork_i]:
             fork = stack[fork_i]
         else:
+            fork_i -= 1
             break
-     
+
     path = []
+    # shifts to parent; like '..' in xpath
     for i in xrange(fork_i, len(stack)):
         path.append(PathItem(go_parent=True))
 
-    for i in xrange(fork_i, len(target_stack)-1):
+    # address by children with indexes; like 'tag[n]' in xpath
+    for i in xrange(fork_i, len(target_stack)):
         tag = target_stack[i]
-        tag_name = tag[0]
+        tag_name = tag[I_TAGNAME]
         parent = target_stack[i-1]
-        children = parent[2]
+        tags = parent[I_CHILDREN]
         idx = 0
-        for j in xrange(0, len(children)):
-            if children[j][0] == tag_name:
-                idx += 1
-                if children[j] == tag:
+        for tag_ in tags:
+            if tag_[I_TAGNAME] == tag_name:
+                if tag_ == tag:
                     break
-        path.append(PathItem(go_child_tag=tag_name, child_index=idx))
+                idx += 1
+        path.append(PathItem(child_tag=tag_name, child_index=idx))
         
     return path
-    
+   
+def _find_tag(html_json, source_tag_info, path):
+    tag = source_tag_info[0]
+    tag_stack = source_tag_info[1]
+    stack_i = len(tag_stack)-1
+
+    for step in path:
+        if step.go_parent:
+            stack_i -= 1
+            tag = tag_stack[stack_i]
+        else:
+            idx = step.child_index
+            next = None
+            for child in tag[I_CHILDREN]:
+                if child[I_TAGNAME] == step.child_tag:
+                    if idx == 0:
+                        next = child
+                        break
+                    idx -= 1
+            if next is None:
+                return None
+            tag = next
+    return tag
 
 def get_selection_tag_ids(item_tag_ids, html_json):
     parent_stacks = {}
 
-    import pdb; pdb.set_trace()
     # buld parent stacks for every item name
     for name in item_tag_ids:
         tag_id = item_tag_ids[name]
-        parent_stacks[name] = build_parent_stack(html_json, tag_id)
+        parent_stacks[name] = _build_parent_stack(html_json, tag_id)
 
     # get first item and get his path
     first_name, parent_stack = parent_stacks.popitem()
-    parent_tag_names = [tag[0] for tag in parent_stack]
+    parent_tag_names = [tag[I_TAGNAME] for tag in parent_stack]
 
     # find tags for first item
-    tags = find_tags_by_tag_names(html_json, parent_tag_names)
+    tags = _find_tags_by_tag_names(html_json, parent_tag_names)
 
     # get pathes for another items
     selection_pathes = {}
@@ -89,21 +130,19 @@ def get_selection_tag_ids(item_tag_ids, html_json):
         selection_pathes[name] = _build_path(parent_stack, parent_stacks[name])
 
     # get selection ids
-    selection_ids = [name:[] for name in item_tag_ids]
-    for source_tag in tags:
-        ids = []
+    selection_ids = {name:[] for name in item_tag_ids}
+    for tag_info in tags:
+        ids = {}
         for name in selection_pathes:
-            tag = _find_tag(html_json, source_tag, selection_path[name])
+            tag = _find_tag(html_json, tag_info, selection_pathes[name])
             if tag is not None:
-                ids[name] = tag[T_ATTRS]['tag-id'])
-            else
+                ids[name] = tag[I_ATTRS]['tag-id']
+            else:
                 ids = None
                 break
         if ids is not None:
-            selection_ids[first_name].append(source_tag[T_ATTRS]['tag-id'])
+            selection_ids[first_name].append(tag_info[0][I_ATTRS]['tag-id'])
             for name in selection_pathes:
                 selection_ids[name].append(ids[name])
 
     return selection_ids
-
-    return { name: tag_ids }