adds additional capabilities to diff of network configs

* diff functions now split out for easier troubleshooting
* added dumps() function to serialize config objects to strings
* difference() can now expand all blocks instead of just singluar blocks

lib/ansible/module_utils/netcfg.py

@@ -28,6 +28,7 @@ from ansible.module_utils.network import to_list
 
 DEFAULT_COMMENT_TOKENS = ['#', '!']
 
+
 class ConfigLine(object):
 
     def __init__(self, text):
@@ -106,6 +107,19 @@ def parse(lines, indent, comment_tokens=None):
 
     return config
 
+def dumps(objects, output='block'):
+    if output == 'block':
+        items = [c.raw for c in objects]
+    elif output == 'commands':
+        items = [c.text for c in objects]
+    elif output == 'lines':
+        items = list()
+        for obj in objects:
+            line = list()
+            line.extend([p.text for p in obj.parents])
+            line.append(obj.text)
+            items.append(' '.join(line))
+    return '\n'.join(items)
 
 class NetworkConfig(object):
 
@@ -113,6 +127,10 @@ class NetworkConfig(object):
         self.indent = indent or 1
         self._config = list()
         self._device_os = device_os
+        self._syntax = 'block' # block, lines, junos
+
+        if self._device_os == 'junos':
+            self._syntax = 'junos'
 
         if contents:
             self.load(contents)
@@ -121,21 +139,10 @@ class NetworkConfig(object):
     def items(self):
         return self._config
 
-    @property
-    def lines(self):
-        lines = list()
-        for item, next_item in get_next(self.items):
-            if next_item is None:
-                lines.append(item.line)
-            elif not next_item.line.startswith(item.line):
-                lines.append(item.line)
-        return lines
-
     def __str__(self):
         if self._device_os == 'junos':
-            lines = self.to_lines(self.expand(self.items))
+            return dumps(self.expand_line(self.items), 'lines')
-            return '\n'.join(lines)
+        return dumps(self.expand_line(self.items))
-        return self.to_block(self.expand(self.items))
 
     def load(self, contents):
         self._config = parse(contents, indent=self.indent)
@@ -152,6 +159,21 @@ class NetworkConfig(object):
                 if parents == path[:-1]:
                     return item
 
+    def get_object(self, path):
+        for item in self.items:
+            if item.text == path[-1]:
+                parents = [p.text for p in item.parents]
+                if parents == path[:-1]:
+                    return item
+
+    def get_section_objects(self, path):
+        if not isinstance(path, list):
+            path = [path]
+        obj = self.get_object(path)
+        if not obj:
+            raise ValueError('path does not exist in config')
+        return self.expand_section(obj)
+
     def search(self, regexp, path=None):
         regex = re.compile(r'^%s' % regexp, re.M)
 
@@ -177,7 +199,7 @@ class NetworkConfig(object):
         regexp = r'%s' % regexp
         return re.findall(regexp, str(self))
 
-    def expand(self, objs):
+    def expand_line(self, objs):
         visited = set()
         expanded = list()
         for o in objs:
@@ -189,35 +211,6 @@ class NetworkConfig(object):
             visited.add(o)
         return expanded
 
-    def to_lines(self, objects):
-        lines = list()
-        for obj in objects:
-            line = list()
-            line.extend([p.text for p in obj.parents])
-            line.append(obj.text)
-            lines.append(' '.join(line))
-        return lines
-
-    def to_block(self, section):
-        return '\n'.join([item.raw for item in section])
-
-    def get_section(self, path):
-        try:
-            section = self.get_section_objects(path)
-            if self._device_os == 'junos':
-                return self.to_lines(section)
-            return self.to_block(section)
-        except ValueError:
-            return list()
-
-    def get_section_objects(self, path):
-        if not isinstance(path, list):
-            path = [path]
-        obj = self.get_object(path)
-        if not obj:
-            raise ValueError('path does not exist in config')
-        return self.expand_section(obj)
-
     def expand_section(self, configobj, S=None):
         if S is None:
             S = list()
@@ -228,74 +221,73 @@ class NetworkConfig(object):
             self.expand_section(child, S)
         return S
 
-    def get_object(self, path):
+    def expand_block(self, objects, visited=None):
-        for item in self.items:
+        items = list()
-            if item.text == path[-1]:
-                parents = [p.text for p in item.parents]
-                if parents == path[:-1]:
-                    return item
 
-    def get_children(self, path):
+        if not visited:
-        obj = self.get_object(path)
+            visited = set()
-        if obj:
-            return obj.children
 
-    def difference(self, other, path=None, match='line', replace='line'):
+        for o in objects:
-        updates = list()
+            items.append(o)
+            visited.add(o)
+            for child in o.children:
+                items.extend(self.expand_block([child], visited))
 
-        config = self.items
+        return items
-        if path:
-            config = self.get_children(path) or list()
 
-        if match == 'line':
+    def diff_line(self, other):
-            for item in config:
+        diff = list()
+        for item in self.items:
             if item not in other.items:
-                    updates.append(item)
+                diff.append(item)
-
+        return diff
-        elif match == 'strict':
-            if path:
-                current = other.get_children(path) or list()
-            else:
-                current = other.items
 
-            for index, item in enumerate(config):
+    def diff_strict(self, other):
+        diff = list()
+        for index, item in enumerate(self.items):
             try:
-                    if item != current[index]:
+                if item != other.items[index]:
-                        updates.append(item)
+                    diff.append(item)
             except IndexError:
-                    updates.append(item)
+                diff.append(item)
+        return diff
 
-        elif match == 'exact':
+    def diff_exact(self, other):
-            if path:
+        diff = list()
-                current = other.get_children(path) or list()
+        if len(other.items) != len(self.items):
-            else:
+            diff.extend(self.items)
-                current = other.items
-
-            if len(current) != len(config):
-                updates.extend(config)
         else:
-                for ours, theirs in itertools.izip(config, current):
+            for ours, theirs in itertools.izip(self.items, other.items):
                 if ours != theirs:
-                        updates.extend(config)
+                    diff.extend(self.items)
                     break
+        return diff
+
+
+    def difference(self, other, match='line', replace='line'):
+        try:
+            func = getattr(self, 'diff_%s' % match)
+            updates = func(other)
+        except AttributeError:
+            raise TypeError('invalid value for match keyword')
 
         if self._device_os == 'junos':
             return updates
 
-        changes = list()
-        for update in updates:
         if replace == 'block':
-                if update.parents:
+            parents = list()
-                    changes.append(update.parents[-1])
+            for u in updates:
-                    for child in update.parents[-1].children:
+                if u.parents is None:
-                        changes.append(child)
+                    if u not in parents:
+                        parents.append(u)
                 else:
-                    changes.append(update)
+                    for p in u.parents:
-            else:
+                        if p not in parents:
-                changes.append(update)
+                            parents.append(p)
-        updates = self.expand(changes)
+
+            return self.expand_block(parents)
 
-        return [item.text for item in updates]
+        return self.expand_line(updates)
 
     def replace(self, patterns, repl, parents=None, add_if_missing=False,
                 ignore_whitespace=True):