Changeset - 3bfd5852c218
[Not reviewed]
beta
0 4 0
Marcin Kuzminski - 13 years ago 2012-11-14 21:44:47
marcin@python-works.com
implements #649 added two seperate method for author and commiter to VCS changeset class
- switch author for git backed to be the real author not commiter
4 files changed with 36 insertions and 1 deletions:
0 comments (0 inline, 0 general)
rhodecode/lib/vcs/backends/base.py
Show inline comments
 
@@ -339,192 +339,216 @@ class BaseChangeset(object):
 
        ``files``
 
            list of ``FileNode`` (``Node`` with NodeKind.FILE) objects
 

	
 
        ``dirs``
 
            list of ``DirNode`` (``Node`` with NodeKind.DIR) objects
 

	
 
        ``nodes``
 
            combined list of ``Node`` objects
 

	
 
        ``author``
 
            author of the changeset, as unicode
 

	
 
        ``message``
 
            message of the changeset, as unicode
 

	
 
        ``parents``
 
            list of parent changesets
 

	
 
        ``last``
 
            ``True`` if this is last changeset in repository, ``False``
 
            otherwise; trying to access this attribute while there is no
 
            changesets would raise ``EmptyRepositoryError``
 
    """
 
    def __str__(self):
 
        return '<%s at %s:%s>' % (self.__class__.__name__, self.revision,
 
            self.short_id)
 

	
 
    def __repr__(self):
 
        return self.__str__()
 

	
 
    def __unicode__(self):
 
        return u'%s:%s' % (self.revision, self.short_id)
 

	
 
    def __eq__(self, other):
 
        return self.raw_id == other.raw_id
 

	
 
    def __json__(self):
 
        return dict(
 
            short_id=self.short_id,
 
            raw_id=self.raw_id,
 
            message=self.message,
 
            date=self.date,
 
            author=self.author,
 
        )
 

	
 
    @LazyProperty
 
    def last(self):
 
        if self.repository is None:
 
            raise ChangesetError("Cannot check if it's most recent revision")
 
        return self.raw_id == self.repository.revisions[-1]
 

	
 
    @LazyProperty
 
    def parents(self):
 
        """
 
        Returns list of parents changesets.
 
        """
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def children(self):
 
        """
 
        Returns list of children changesets.
 
        """
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def id(self):
 
        """
 
        Returns string identifying this changeset.
 
        """
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def raw_id(self):
 
        """
 
        Returns raw string identifying this changeset.
 
        """
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def short_id(self):
 
        """
 
        Returns shortened version of ``raw_id`` attribute, as string,
 
        identifying this changeset, useful for web representation.
 
        """
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def revision(self):
 
        """
 
        Returns integer identifying this changeset.
 

	
 
        """
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def commiter(self):
 
        """
 
        Returns Commiter for given commit
 
        """
 

	
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def commiter_name(self):
 
        """
 
        Returns Author name for given commit
 
        """
 

	
 
        return author_name(self.commiter)
 

	
 
    @LazyProperty
 
    def commiter_email(self):
 
        """
 
        Returns Author email address for given commit
 
        """
 

	
 
        return author_email(self.commiter)
 

	
 
    @LazyProperty
 
    def author(self):
 
        """
 
        Returns Author for given commit
 
        """
 

	
 
        raise NotImplementedError
 

	
 
    @LazyProperty
 
    def author_name(self):
 
        """
 
        Returns Author name for given commit
 
        """
 

	
 
        return author_name(self.author)
 

	
 
    @LazyProperty
 
    def author_email(self):
 
        """
 
        Returns Author email address for given commit
 
        """
 

	
 
        return author_email(self.author)
 

	
 
    def get_file_mode(self, path):
 
        """
 
        Returns stat mode of the file at the given ``path``.
 
        """
 
        raise NotImplementedError
 

	
 
    def get_file_content(self, path):
 
        """
 
        Returns content of the file at the given ``path``.
 
        """
 
        raise NotImplementedError
 

	
 
    def get_file_size(self, path):
 
        """
 
        Returns size of the file at the given ``path``.
 
        """
 
        raise NotImplementedError
 

	
 
    def get_file_changeset(self, path):
 
        """
 
        Returns last commit of the file at the given ``path``.
 
        """
 
        raise NotImplementedError
 

	
 
    def get_file_history(self, path):
 
        """
 
        Returns history of file as reversed list of ``Changeset`` objects for
 
        which file at given ``path`` has been modified.
 
        """
 
        raise NotImplementedError
 

	
 
    def get_nodes(self, path):
 
        """
 
        Returns combined ``DirNode`` and ``FileNode`` objects list representing
 
        state of changeset at the given ``path``.
 

	
 
        :raises ``ChangesetError``: if node at the given ``path`` is not
 
          instance of ``DirNode``
 
        """
 
        raise NotImplementedError
 

	
 
    def get_node(self, path):
 
        """
 
        Returns ``Node`` object from the given ``path``.
 

	
 
        :raises ``NodeDoesNotExistError``: if there is no node at the given
 
          ``path``
 
        """
 
        raise NotImplementedError
 

	
 
    def fill_archive(self, stream=None, kind='tgz', prefix=None):
 
        """
 
        Fills up given stream.
 

	
 
        :param stream: file like object.
 
        :param kind: one of following: ``zip``, ``tar``, ``tgz``
 
            or ``tbz2``. Default: ``tgz``.
 
        :param prefix: name of root directory in archive.
 
            Default is repository name and changeset's raw_id joined with dash.
 

	
 
            repo-tip.<kind>
 
        """
 

	
 
        raise NotImplementedError
 

	
 
    def get_chunked_archive(self, **kwargs):
 
        """
 
        Returns iterable archive. Tiny wrapper around ``fill_archive`` method.
 

	
 
        :param chunk_size: extra parameter which controls size of returned
 
            chunks. Default:8k.
 
        """
 

	
rhodecode/lib/vcs/backends/git/changeset.py
Show inline comments
 
import re
 
from itertools import chain
 
from dulwich import objects
 
from subprocess import Popen, PIPE
 
from rhodecode.lib.vcs.conf import settings
 
from rhodecode.lib.vcs.exceptions import RepositoryError
 
from rhodecode.lib.vcs.exceptions import ChangesetError
 
from rhodecode.lib.vcs.exceptions import NodeDoesNotExistError
 
from rhodecode.lib.vcs.exceptions import VCSError
 
from rhodecode.lib.vcs.exceptions import ChangesetDoesNotExistError
 
from rhodecode.lib.vcs.exceptions import ImproperArchiveTypeError
 
from rhodecode.lib.vcs.backends.base import BaseChangeset, EmptyChangeset
 
from rhodecode.lib.vcs.nodes import FileNode, DirNode, NodeKind, RootNode, \
 
    RemovedFileNode, SubModuleNode, ChangedFileNodesGenerator,\
 
    AddedFileNodesGenerator, RemovedFileNodesGenerator
 
from rhodecode.lib.vcs.utils import safe_unicode
 
from rhodecode.lib.vcs.utils import date_fromtimestamp
 
from rhodecode.lib.vcs.utils.lazy import LazyProperty
 

	
 

	
 
class GitChangeset(BaseChangeset):
 
    """
 
    Represents state of the repository at single revision.
 
    """
 

	
 
    def __init__(self, repository, revision):
 
        self._stat_modes = {}
 
        self.repository = repository
 

	
 
        try:
 
            commit = self.repository._repo.get_object(revision)
 
            if isinstance(commit, objects.Tag):
 
                revision = commit.object[1]
 
                commit = self.repository._repo.get_object(commit.object[1])
 
        except KeyError:
 
            raise RepositoryError("Cannot get object with id %s" % revision)
 
        self.raw_id = revision
 
        self.id = self.raw_id
 
        self.short_id = self.raw_id[:12]
 
        self._commit = commit
 

	
 
        self._tree_id = commit.tree
 
        self._commiter_property = 'committer'
 
        self._author_property = 'author'
 
        self._date_property = 'commit_time'
 
        self._date_tz_property = 'commit_timezone'
 
        self.revision = repository.revisions.index(revision)
 

	
 
        self.message = safe_unicode(commit.message)
 

	
 
        self.nodes = {}
 
        self._paths = {}
 

	
 
    @LazyProperty
 
    def commiter(self):
 
        return safe_unicode(getattr(self._commit, self._commiter_property))
 

	
 
    @LazyProperty
 
    def author(self):
 
        return safe_unicode(getattr(self._commit, self._commiter_property))
 
        return safe_unicode(getattr(self._commit, self._author_property))
 

	
 
    @LazyProperty
 
    def date(self):
 
        return date_fromtimestamp(getattr(self._commit, self._date_property),
 
                                  getattr(self._commit, self._date_tz_property))
 

	
 
    @LazyProperty
 
    def _timestamp(self):
 
        return getattr(self._commit, self._date_property)
 

	
 
    @LazyProperty
 
    def status(self):
 
        """
 
        Returns modified, added, removed, deleted files for current changeset
 
        """
 
        return self.changed, self.added, self.removed
 

	
 
    @LazyProperty
 
    def tags(self):
 
        _tags = []
 
        for tname, tsha in self.repository.tags.iteritems():
 
            if tsha == self.raw_id:
 
                _tags.append(tname)
 
        return _tags
 

	
 
    @LazyProperty
 
    def branch(self):
 

	
 
        heads = self.repository._heads(reverse=False)
 

	
 
        ref = heads.get(self.raw_id)
 
        if ref:
 
            return safe_unicode(ref)
 

	
 
    def _fix_path(self, path):
 
        """
 
        Paths are stored without trailing slash so we need to get rid off it if
 
        needed.
 
        """
 
        if path.endswith('/'):
 
            path = path.rstrip('/')
 
        return path
 

	
 
    def _get_id_for_path(self, path):
 

	
 
        # FIXME: Please, spare a couple of minutes and make those codes cleaner;
 
        if not path in self._paths:
 
            path = path.strip('/')
 
            # set root tree
 
            tree = self.repository._repo[self._tree_id]
 
            if path == '':
 
                self._paths[''] = tree.id
 
                return tree.id
 
            splitted = path.split('/')
 
            dirs, name = splitted[:-1], splitted[-1]
 
            curdir = ''
 

	
 
            # initially extract things from root dir
 
            for item, stat, id in tree.iteritems():
 
                if curdir:
 
                    name = '/'.join((curdir, item))
 
                else:
 
                    name = item
 
                self._paths[name] = id
 
                self._stat_modes[name] = stat
 

	
 
            for dir in dirs:
 
                if curdir:
 
                    curdir = '/'.join((curdir, dir))
 
                else:
 
                    curdir = dir
 
                dir_id = None
 
                for item, stat, id in tree.iteritems():
 
                    if dir == item:
 
                        dir_id = id
 
                if dir_id:
 
                    # Update tree
 
                    tree = self.repository._repo[dir_id]
 
                    if not isinstance(tree, objects.Tree):
 
                        raise ChangesetError('%s is not a directory' % curdir)
 
                else:
 
                    raise ChangesetError('%s have not been found' % curdir)
 

	
 
                # cache all items from the given traversed tree
 
                for item, stat, id in tree.iteritems():
 
                    if curdir:
 
                        name = '/'.join((curdir, item))
 
                    else:
 
                        name = item
 
                    self._paths[name] = id
 
                    self._stat_modes[name] = stat
 
            if not path in self._paths:
 
                raise NodeDoesNotExistError("There is no file nor directory "
 
                    "at the given path %r at revision %r"
 
                    % (path, self.short_id))
 
        return self._paths[path]
rhodecode/lib/vcs/backends/hg/changeset.py
Show inline comments
 
import os
 
import posixpath
 

	
 
from rhodecode.lib.vcs.backends.base import BaseChangeset
 
from rhodecode.lib.vcs.conf import settings
 
from rhodecode.lib.vcs.exceptions import  ChangesetDoesNotExistError, \
 
    ChangesetError, ImproperArchiveTypeError, NodeDoesNotExistError, VCSError
 
from rhodecode.lib.vcs.nodes import AddedFileNodesGenerator, \
 
    ChangedFileNodesGenerator, DirNode, FileNode, NodeKind, \
 
    RemovedFileNodesGenerator, RootNode, SubModuleNode
 

	
 
from rhodecode.lib.vcs.utils import safe_str, safe_unicode, date_fromtimestamp
 
from rhodecode.lib.vcs.utils.lazy import LazyProperty
 
from rhodecode.lib.vcs.utils.paths import get_dirs_for_path
 
from rhodecode.lib.vcs.utils.hgcompat import archival, hex
 

	
 

	
 
class MercurialChangeset(BaseChangeset):
 
    """
 
    Represents state of the repository at the single revision.
 
    """
 

	
 
    def __init__(self, repository, revision):
 
        self.repository = repository
 
        self.raw_id = revision
 
        self._ctx = repository._repo[revision]
 
        self.revision = self._ctx._rev
 
        self.nodes = {}
 

	
 
    @LazyProperty
 
    def tags(self):
 
        return map(safe_unicode, self._ctx.tags())
 

	
 
    @LazyProperty
 
    def branch(self):
 
        return  safe_unicode(self._ctx.branch())
 

	
 
    @LazyProperty
 
    def bookmarks(self):
 
        return map(safe_unicode, self._ctx.bookmarks())
 

	
 
    @LazyProperty
 
    def message(self):
 
        return safe_unicode(self._ctx.description())
 

	
 
    @LazyProperty
 
    def commiter(self):
 
        return safe_unicode(self.auhtor)
 

	
 
    @LazyProperty
 
    def author(self):
 
        return safe_unicode(self._ctx.user())
 

	
 
    @LazyProperty
 
    def date(self):
 
        return date_fromtimestamp(*self._ctx.date())
 

	
 
    @LazyProperty
 
    def _timestamp(self):
 
        return self._ctx.date()[0]
 

	
 
    @LazyProperty
 
    def status(self):
 
        """
 
        Returns modified, added, removed, deleted files for current changeset
 
        """
 
        return self.repository._repo.status(self._ctx.p1().node(),
 
                                            self._ctx.node())
 

	
 
    @LazyProperty
 
    def _file_paths(self):
 
        return list(self._ctx)
 

	
 
    @LazyProperty
 
    def _dir_paths(self):
 
        p = list(set(get_dirs_for_path(*self._file_paths)))
 
        p.insert(0, '')
 
        return p
 

	
 
    @LazyProperty
 
    def _paths(self):
 
        return self._dir_paths + self._file_paths
 

	
 
    @LazyProperty
 
    def id(self):
 
        if self.last:
 
            return u'tip'
 
        return self.short_id
 

	
 
    @LazyProperty
 
    def short_id(self):
 
        return self.raw_id[:12]
 

	
 
    @LazyProperty
 
    def parents(self):
 
        """
 
        Returns list of parents changesets.
 
        """
 
        return [self.repository.get_changeset(parent.rev())
 
                for parent in self._ctx.parents() if parent.rev() >= 0]
 

	
 
    @LazyProperty
 
    def children(self):
 
        """
 
        Returns list of children changesets.
 
        """
 
        return [self.repository.get_changeset(child.rev())
 
                for child in self._ctx.children() if child.rev() >= 0]
 

	
 
    def next(self, branch=None):
 

	
 
        if branch and self.branch != branch:
 
            raise VCSError('Branch option used on changeset not belonging '
 
                           'to that branch')
 

	
 
        def _next(changeset, branch):
 
            try:
 
                next_ = changeset.revision + 1
 
                next_rev = changeset.repository.revisions[next_]
 
            except IndexError:
 
                raise ChangesetDoesNotExistError
 
            cs = changeset.repository.get_changeset(next_rev)
 

	
 
            if branch and branch != cs.branch:
 
                return _next(cs, branch)
 

	
 
            return cs
 

	
 
        return _next(self, branch)
 

	
 
    def prev(self, branch=None):
 
        if branch and self.branch != branch:
 
            raise VCSError('Branch option used on changeset not belonging '
 
                           'to that branch')
 

	
 
        def _prev(changeset, branch):
 
            try:
 
                prev_ = changeset.revision - 1
 
                if prev_ < 0:
 
                    raise IndexError
 
                prev_rev = changeset.repository.revisions[prev_]
 
            except IndexError:
 
                raise ChangesetDoesNotExistError
 

	
 
            cs = changeset.repository.get_changeset(prev_rev)
 

	
rhodecode/lib/vcs/nodes.py
Show inline comments
 
@@ -260,249 +260,251 @@ class FileNode(Node):
 
        if content and changeset:
 
            raise NodeError("Cannot use both content and changeset")
 
        super(FileNode, self).__init__(path, kind=NodeKind.FILE)
 
        self.changeset = changeset
 
        self._content = content
 
        self._mode = mode or 0100644
 

	
 
    @LazyProperty
 
    def mode(self):
 
        """
 
        Returns lazily mode of the FileNode. If ``changeset`` is not set, would
 
        use value given at initialization or 0100644 (default).
 
        """
 
        if self.changeset:
 
            mode = self.changeset.get_file_mode(self.path)
 
        else:
 
            mode = self._mode
 
        return mode
 

	
 
    def _get_content(self):
 
        if self.changeset:
 
            content = self.changeset.get_file_content(self.path)
 
        else:
 
            content = self._content
 
        return content
 

	
 
    @property
 
    def content(self):
 
        """
 
        Returns lazily content of the FileNode. If possible, would try to
 
        decode content from UTF-8.
 
        """
 
        content = self._get_content()
 

	
 
        if bool(content and '\0' in content):
 
            return content
 
        return safe_unicode(content)
 

	
 
    @LazyProperty
 
    def size(self):
 
        if self.changeset:
 
            return self.changeset.get_file_size(self.path)
 
        raise NodeError("Cannot retrieve size of the file without related "
 
            "changeset attribute")
 

	
 
    @LazyProperty
 
    def message(self):
 
        if self.changeset:
 
            return self.last_changeset.message
 
        raise NodeError("Cannot retrieve message of the file without related "
 
            "changeset attribute")
 

	
 
    @LazyProperty
 
    def last_changeset(self):
 
        if self.changeset:
 
            return self.changeset.get_file_changeset(self.path)
 
        raise NodeError("Cannot retrieve last changeset of the file without "
 
            "related changeset attribute")
 

	
 
    def get_mimetype(self):
 
        """
 
        Mimetype is calculated based on the file's content. If ``_mimetype``
 
        attribute is available, it will be returned (backends which store
 
        mimetypes or can easily recognize them, should set this private
 
        attribute to indicate that type should *NOT* be calculated).
 
        """
 
        if hasattr(self, '_mimetype'):
 
            if (isinstance(self._mimetype, (tuple, list,)) and
 
                len(self._mimetype) == 2):
 
                return self._mimetype
 
            else:
 
                raise NodeError('given _mimetype attribute must be an 2 '
 
                               'element list or tuple')
 

	
 
        mtype, encoding = mimetypes.guess_type(self.name)
 

	
 
        if mtype is None:
 
            if self.is_binary:
 
                mtype = 'application/octet-stream'
 
                encoding = None
 
            else:
 
                mtype = 'text/plain'
 
                encoding = None
 
        return mtype, encoding
 

	
 
    @LazyProperty
 
    def mimetype(self):
 
        """
 
        Wrapper around full mimetype info. It returns only type of fetched
 
        mimetype without the encoding part. use get_mimetype function to fetch
 
        full set of (type,encoding)
 
        """
 
        return self.get_mimetype()[0]
 

	
 
    @LazyProperty
 
    def mimetype_main(self):
 
        return ['', '']
 
        return self.mimetype.split('/')[0]
 

	
 
    @LazyProperty
 
    def lexer(self):
 
        """
 
        Returns pygment's lexer class. Would try to guess lexer taking file's
 
        content, name and mimetype.
 
        """
 
        try:
 
            lexer = lexers.guess_lexer_for_filename(self.name, self.content)
 
        except lexers.ClassNotFound:
 
            lexer = lexers.TextLexer()
 
        # returns first alias
 
        return lexer
 

	
 
    @LazyProperty
 
    def lexer_alias(self):
 
        """
 
        Returns first alias of the lexer guessed for this file.
 
        """
 
        return self.lexer.aliases[0]
 

	
 
    @LazyProperty
 
    def history(self):
 
        """
 
        Returns a list of changeset for this file in which the file was changed
 
        """
 
        if self.changeset is None:
 
            raise NodeError('Unable to get changeset for this FileNode')
 
        return self.changeset.get_file_history(self.path)
 

	
 
    @LazyProperty
 
    def annotate(self):
 
        """
 
        Returns a list of three element tuples with lineno,changeset and line
 
        """
 
        if self.changeset is None:
 
            raise NodeError('Unable to get changeset for this FileNode')
 
        return self.changeset.get_file_annotate(self.path)
 

	
 
    @LazyProperty
 
    def state(self):
 
        if not self.changeset:
 
            raise NodeError("Cannot check state of the node if it's not "
 
                "linked with changeset")
 
        elif self.path in (node.path for node in self.changeset.added):
 
            return NodeState.ADDED
 
        elif self.path in (node.path for node in self.changeset.changed):
 
            return NodeState.CHANGED
 
        else:
 
            return NodeState.NOT_CHANGED
 

	
 
    @property
 
    def is_binary(self):
 
        """
 
        Returns True if file has binary content.
 
        """
 
        return False
 
        _bin = '\0' in self._get_content()
 
        return _bin
 

	
 
    @LazyProperty
 
    def extension(self):
 
        """Returns filenode extension"""
 
        return self.name.split('.')[-1]
 

	
 
    def is_executable(self):
 
        """
 
        Returns ``True`` if file has executable flag turned on.
 
        """
 
        return bool(self.mode & stat.S_IXUSR)
 

	
 
    def __repr__(self):
 
        return '<%s %r @ %s>' % (self.__class__.__name__, self.path,
 
                                 getattr(self.changeset, 'short_id', ''))
 

	
 

	
 
class RemovedFileNode(FileNode):
 
    """
 
    Dummy FileNode class - trying to access any public attribute except path,
 
    name, kind or state (or methods/attributes checking those two) would raise
 
    RemovedFileNodeError.
 
    """
 
    ALLOWED_ATTRIBUTES = [
 
        'name', 'path', 'state', 'is_root', 'is_file', 'is_dir', 'kind',
 
        'added', 'changed', 'not_changed', 'removed'
 
    ]
 

	
 
    def __init__(self, path):
 
        """
 
        :param path: relative path to the node
 
        """
 
        super(RemovedFileNode, self).__init__(path=path)
 

	
 
    def __getattribute__(self, attr):
 
        if attr.startswith('_') or attr in RemovedFileNode.ALLOWED_ATTRIBUTES:
 
            return super(RemovedFileNode, self).__getattribute__(attr)
 
        raise RemovedFileNodeError("Cannot access attribute %s on "
 
            "RemovedFileNode" % attr)
 

	
 
    @LazyProperty
 
    def state(self):
 
        return NodeState.REMOVED
 

	
 

	
 
class DirNode(Node):
 
    """
 
    DirNode stores list of files and directories within this node.
 
    Nodes may be used standalone but within repository context they
 
    lazily fetch data within same repositorty's changeset.
 
    """
 

	
 
    def __init__(self, path, nodes=(), changeset=None):
 
        """
 
        Only one of ``nodes`` and ``changeset`` may be given. Passing both
 
        would raise ``NodeError`` exception.
 

	
 
        :param path: relative path to the node
 
        :param nodes: content may be passed to constructor
 
        :param changeset: if given, will use it to lazily fetch content
 
        :param size: always 0 for ``DirNode``
 
        """
 
        if nodes and changeset:
 
            raise NodeError("Cannot use both nodes and changeset")
 
        super(DirNode, self).__init__(path, NodeKind.DIR)
 
        self.changeset = changeset
 
        self._nodes = nodes
 

	
 
    @LazyProperty
 
    def content(self):
 
        raise NodeError("%s represents a dir and has no ``content`` attribute"
 
            % self)
 

	
 
    @LazyProperty
 
    def nodes(self):
 
        if self.changeset:
 
            nodes = self.changeset.get_nodes(self.path)
 
        else:
 
            nodes = self._nodes
 
        self._nodes_dict = dict((node.path, node) for node in nodes)
 
        return sorted(nodes)
 

	
 
    @LazyProperty
 
    def files(self):
 
        return sorted((node for node in self.nodes if node.is_file()))
 

	
 
    @LazyProperty
 
    def dirs(self):
 
        return sorted((node for node in self.nodes if node.is_dir()))
 

	
 
    def __iter__(self):
 
        for node in self.nodes:
 
            yield node
 

	
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