doorstop.core.item._convert_to_yaml() - Code Metrics - Inspection of "Merge pull request #397 from sebhub/string-attribu..." - jacebrowning/doorstop - Measure and Improve Code Quality continuously with Scrutinizer

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Push — develop ( 38b266...14345b )

by Jace
created 2019-08-05 19:32 UTC
doorstop.core.item._convert_to_yaml() B

↳ Parent: doorstop.core.item
Complexity

Conditions
Size

Total Lines	24
Code Lines	12
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	15
CRAP Score	6
Importance

Changes
Metric	Value
eloc	12
dl	0
loc	24
ccs	15
cts	15
cp	1
rs	8.6666
c	0
b	0
f	0
cc	6
nop	3
crap	6
# SPDX-License-Identifier: LGPL-3.0-only

"""Representation of an item in a document."""

import functools
import os
import re

import pyficache

from doorstop import common, settings
from doorstop.common import DoorstopError, DoorstopInfo, DoorstopWarning
from doorstop.core import editor
from doorstop.core.base import (
    BaseFileObject,
    BaseValidatable,
    add_item,
    auto_load,
    auto_save,
    delete_item,
    edit_item,
)
from doorstop.core.types import UID, Level, Prefix, Stamp, Text, to_bool

log = common.logger(__name__)


def _convert_to_yaml(indent, prefix, value):
    """Convert value to YAML output format.

    :param indent: the indentation level
    :param prefix: the length of the prefix before the value, e.g. '- ' for
    lists or 'key: ' for keys
    :param value: the value to convert

    :return: the value converted to YAML output format

    """
    if isinstance(value, str):
        length = indent + prefix + len(value)
        if length > settings.MAX_LINE_LENGTH or '\n' in value:
            value = Text.save_text(value.strip())
        else:
            value = str(value)  # line is short enough as a string
    elif isinstance(value, list):
        value = [_convert_to_yaml(indent, 2, v) for v in value]
    elif isinstance(value, dict):
        value = {
            k: _convert_to_yaml(indent + 2, len(k) + 2, v) for k, v in value.items()
        }
    return value


def requires_tree(func):
    """Require a tree reference."""

    @functools.wraps(func)
    def wrapped(self, *args, **kwargs):
        if not self.tree:
            name = func.__name__
            log.critical("`{}` can only be called with a tree".format(name))
            return None
        return func(self, *args, **kwargs)

    return wrapped


class Item(BaseValidatable, BaseFileObject):  # pylint: disable=R0902
    """Represents an item file with linkable text."""

    EXTENSIONS = '.yml', '.yaml'

    DEFAULT_LEVEL = Level('1.0')
    DEFAULT_ACTIVE = True
    DEFAULT_NORMATIVE = True
    DEFAULT_DERIVED = False
    DEFAULT_REVIEWED = Stamp()
    DEFAULT_TEXT = Text()
    DEFAULT_REF = ""
    DEFAULT_HEADER = Text()

    def __init__(self, document, path, root=os.getcwd(), **kwargs):
        """Initialize an item from an existing file.

        :param path: path to Item file
        :param root: path to root of project

        """
        super().__init__()
        # Ensure the path is valid
        if not os.path.isfile(path):
            raise DoorstopError("item does not exist: {}".format(path))
        # Ensure the filename is valid
        filename = os.path.basename(path)
        name, ext = os.path.splitext(filename)
        try:
            UID(name).check()
        except DoorstopError:
            msg = "invalid item filename: {}".format(filename)
            raise DoorstopError(msg) from None
        # Ensure the file extension is valid
        if ext.lower() not in self.EXTENSIONS:
            msg = "'{0}' extension not in {1}".format(path, self.EXTENSIONS)
            raise DoorstopError(msg)
        # Initialize the item
        self.path = path
        self.root = root
        self.document = document
        self.tree = kwargs.get('tree')
        self.auto = kwargs.get('auto', Item.auto)
        # Set default values
        self._data['level'] = Item.DEFAULT_LEVEL
        self._data['active'] = Item.DEFAULT_ACTIVE
        self._data['normative'] = Item.DEFAULT_NORMATIVE
        self._data['derived'] = Item.DEFAULT_DERIVED
        self._data['reviewed'] = Item.DEFAULT_REVIEWED
        self._data['text'] = Item.DEFAULT_TEXT
        self._data['ref'] = Item.DEFAULT_REF
        self._data['links'] = set()
        if settings.ENABLE_HEADERS:
            self._data['header'] = Item.DEFAULT_HEADER

    def __repr__(self):
        return "Item('{}')".format(self.path)

    def __str__(self):
        if common.verbosity < common.STR_VERBOSITY:
            return str(self.uid)
        else:
            return "{} ({})".format(self.uid, self.relpath)

    def __lt__(self, other):
        if self.level == other.level:
            return self.uid < other.uid
        else:
            return self.level < other.level

    @staticmethod
    @add_item
    def new(
        tree, document, path, root, uid, level=None, auto=None
    ):  # pylint: disable=R0913
        """Create a new item.

        :param tree: reference to the tree that contains this item
        :param document: reference to document that contains this item

        :param path: path to directory for the new item
        :param root: path to root of the project
        :param uid: UID for the new item

        :param level: level for the new item
        :param auto: automatically save the item

        :raises: :class:`~doorstop.common.DoorstopError` if the item
            already exists

        :return: new :class:`~doorstop.core.item.Item`

        """
        UID(uid).check()
        filename = str(uid) + Item.EXTENSIONS[0]
        path2 = os.path.join(path, filename)
        # Create the initial item file
        log.debug("creating item file at {}...".format(path2))
        Item._create(path2, name='item')
        # Initialize the item
        item = Item(document, path2, root=root, tree=tree, auto=False)
        item.level = level if level is not None else item.level
        if auto or (auto is None and Item.auto):
            item.save()
        # Return the item
        return item

    def _set_attributes(self, attributes):
        """Set the item's attributes."""
        for key, value in attributes.items():
            if key == 'level':
                value = Level(value)
            elif key == 'active':
                value = to_bool(value)
            elif key == 'normative':
                value = to_bool(value)
            elif key == 'derived':
                value = to_bool(value)
            elif key == 'reviewed':
                value = Stamp(value)
            elif key == 'text':
                value = Text(value)
            elif key == 'ref':
                value = value.strip()
            elif key == 'links':
                value = set(UID(part) for part in value)
            elif key == 'header':
                value = Text(value)
            self._data[key] = value

    def load(self, reload=False):
        """Load the item's properties from its file."""
        if self._loaded and not reload:
            return
        log.debug("loading {}...".format(repr(self)))
        # Read text from file
        text = self._read(self.path)
        # Parse YAML data from text
        data = self._load(text, self.path)
        # Store parsed data
        self._set_attributes(data)
        # Set meta attributes
        self._loaded = True

    @edit_item
    def save(self):
        """Format and save the item's properties to its file."""
        log.debug("saving {}...".format(repr(self)))
        # Format the data items
        data = self._yaml_data()
        # Dump the data to YAML
        text = self._dump(data)
        # Save the YAML to file
        self._write(text, self.path)
        # Set meta attributes
        self._loaded = True
        self.auto = True

    # properties #############################################################

    def _yaml_data(self):
        """Get all the item's data formatted for YAML dumping."""
        data = {}
        for key, value in self._data.items():
            if key == 'level':
                value = value.yaml
            elif key == 'text':
                value = value.yaml
            elif key == 'header':
                # Handle for case if the header is undefined in YAML
                if hasattr(value, 'yaml'):
                    value = value.yaml
                else:
                    value = ''
            elif key == 'ref':
                value = value.strip()
            elif key == 'links':
                value = [{str(i): i.stamp.yaml} for i in sorted(value)]
            elif key == 'reviewed':
                value = value.yaml
            else:
                value = _convert_to_yaml(0, len(key) + 2, value)
            data[key] = value
        return data

    @property
    @auto_load
    def data(self):
        """Load and get all the item's data formatted for YAML dumping."""
        return self._yaml_data()

    @property
    def uid(self):
        """Get the item's UID."""
        filename = os.path.basename(self.path)
        return UID(os.path.splitext(filename)[0])

    @property
    def prefix(self):
        """Get the item UID's prefix."""
        return self.uid.prefix

    @property
    def number(self):
        """Get the item UID's number."""
        return self.uid.number

    @property
    @auto_load
    def level(self):
        """Get the item's level."""
        return self._data['level']

    @level.setter
    @auto_save
    def level(self, value):
        """Set the item's level."""
        self._data['level'] = Level(value)

    @property
    def depth(self):
        """Get the item's heading order based on it's level."""
        return len(self.level)

    @property
    @auto_load
    def active(self):
        """Get the item's active status.

        An inactive item will not be validated. Inactive items are
        intended to be used for:

        - future requirements
        - temporarily disabled requirements or tests
        - externally implemented requirements
        - etc.

        """
        return self._data['active']

    @active.setter
    @auto_save
    def active(self, value):
        """Set the item's active status."""
        self._data['active'] = to_bool(value)

    @property
    @auto_load
    def derived(self):
        """Get the item's derived status.

        A derived item does not have links to items in its parent
        document, but should still be linked to by items in its child
        documents.

        """
        return self._data['derived']

    @derived.setter
    @auto_save
    def derived(self, value):
        """Set the item's derived status."""
        self._data['derived'] = to_bool(value)

    @property
    @auto_load
    def normative(self):
        """Get the item's normative status.

        A non-normative item should not have or be linked to.
        Non-normative items are intended to be used for:

        - headings
        - comments
        - etc.

        """
        return self._data['normative']

    @normative.setter
    @auto_save
    def normative(self, value):
        """Set the item's normative status."""
        self._data['normative'] = to_bool(value)

    @property
    def heading(self):
        """Indicate if the item is a heading.

        Headings have a level that ends in zero and are non-normative.

        """
        return self.level.heading and not self.normative

    @heading.setter
    @auto_save
    def heading(self, value):
        """Set the item's heading status."""
        heading = to_bool(value)
        if heading and not self.heading:
            self.level.heading = True
            self.normative = False
        elif not heading and self.heading:
            self.level.heading = False
            self.normative = True

    @property
    @auto_load
    def cleared(self):
        """Indicate if no links are suspect."""
        for uid, item in self._get_parent_uid_and_item():
            if uid.stamp != item.stamp():
                return False
        return True

    @property
    @auto_load
    def reviewed(self):
        """Indicate if the item has been reviewed."""
        stamp = self.stamp(links=True)
        if self._data['reviewed'] == Stamp(True):
            self._data['reviewed'] = stamp
        return self._data['reviewed'] == stamp

    @reviewed.setter
    @auto_save
    def reviewed(self, value):
        """Set the item's review status."""
        self._data['reviewed'] = Stamp(value)

    @property
    @auto_load
    def text(self):
        """Get the item's text."""
        return self._data['text']

    @text.setter
    @auto_save
    def text(self, value):
        """Set the item's text."""
        self._data['text'] = Text(value)

    @property
    @auto_load
    def header(self):
        """Get the item's header."""
        if settings.ENABLE_HEADERS:
            return self._data['header']
        return None

    @header.setter
    @auto_save
    def header(self, value):
        """Set the item's header."""
        if settings.ENABLE_HEADERS:
            self._data['header'] = Text(value)

    @property
    @auto_load
    def ref(self):
        """Get the item's external file reference.

        An external reference can be part of a line in a text file or
        the filename of any type of file.

        """
        return self._data['ref']

    @ref.setter
    @auto_save
    def ref(self, value):
        """Set the item's external file reference."""
        self._data['ref'] = str(value) if value else ""

    @property
    @auto_load
    def links(self):
        """Get a list of the item UIDs this item links to."""
        return sorted(self._data['links'])

    @links.setter
    @auto_save
    def links(self, value):
        """Set the list of item UIDs this item links to."""
        self._data['links'] = set(UID(v) for v in value)

    @property
    def parent_links(self):
        """Get a list of the item UIDs this item links to."""
        return self.links  # alias

    @parent_links.setter
    def parent_links(self, value):
        """Set the list of item UIDs this item links to."""
        self.links = value  # alias

    @requires_tree
    def _get_parent_uid_and_item(self):
        """Yield UID and item of all links of this item."""
        for uid in self.links:
            try:
                item = self.tree.find_item(uid)
            except DoorstopError:
                item = UnknownItem(uid)
                log.warning(item.exception)
            yield uid, item

    @property
    def parent_items(self):
        """Get a list of items that this item links to."""
        return [item for uid, item in self._get_parent_uid_and_item()]

    @property
    @requires_tree
    def parent_documents(self):
        """Get a list of documents that this item's document should link to.

        .. note::

           A document only has one parent.

        """
        try:
            return [self.tree.find_document(self.document.prefix)]
        except DoorstopError:
            log.warning(Prefix.UNKNOWN_MESSGE.format(self.document.prefix))
            return []

    # actions ################################################################

    @auto_save
    def set_attributes(self, attributes):
        """Set the item's attributes and save them."""
        self._set_attributes(attributes)

    @auto_save
    def edit(self, tool=None, edit_all=True):
        """Open the item for editing.

        :param tool: path of alternate editor
        :param edit_all: True to edit the whole item,
            False to only edit the text.

        """
        # Lock the item
        if self.tree:
            self.tree.vcs.lock(self.path)
        # Edit the whole file in an editor
        if edit_all:
            editor.edit(self.path, tool=tool)
        # Edit only the text part in an editor
        else:
            # Edit the text in a temporary file
            edited_text = editor.edit_tmp_content(
                title=str(self.uid), original_content=str(self.text), tool=tool
            )
            # Save the text in the actual item file
            self.text = edited_text
            self.save()

        # Force reloaded
        self._loaded = False

    @auto_save
    def link(self, value):
        """Add a new link to another item UID.

        :param value: item or UID

        """
        uid = UID(value)
        log.info("linking to '{}'...".format(uid))
        self._data['links'].add(uid)

    @auto_save
    def unlink(self, value):
        """Remove an existing link by item UID.

        :param value: item or UID

        """
        uid = UID(value)
        try:
            self._data['links'].remove(uid)
        except KeyError:
            log.warning("link to {0} does not exist".format(uid))

    def get_issues(
        self, skip=None, document_hook=None, item_hook=None
    ):  # pylint: disable=unused-argument
        """Yield all the item's issues.

        :param skip: list of document prefixes to skip

        :return: generator of :class:`~doorstop.common.DoorstopError`,
                              :class:`~doorstop.common.DoorstopWarning`,
                              :class:`~doorstop.common.DoorstopInfo`

        """
        assert document_hook is None
        assert item_hook is None
        skip = [] if skip is None else skip

        log.info("checking item %s...", self)

        # Verify the file can be parsed
        self.load()

        # Skip inactive items
        if not self.active:
            log.info("skipped inactive item: %s", self)
            return

        # Delay item save if reformatting
        if settings.REFORMAT:
            self.auto = False

        # Check text
        if not self.text:
            yield DoorstopWarning("no text")

        # Check external references
        if settings.CHECK_REF:
            try:
                self.find_ref()
            except DoorstopError as exc:
                yield exc

        # Check links
        if not self.normative and self.links:
            yield DoorstopWarning("non-normative, but has links")

        # Check links against the document
        yield from self._get_issues_document(self.document, skip)

        if self.tree:
            # Check links against the tree
            yield from self._get_issues_tree(self.tree)

            # Check links against both document and tree
            yield from self._get_issues_both(self.document, self.tree, skip)

        # Check review status
        if not self.reviewed:
            if settings.CHECK_REVIEW_STATUS:
                if not self._data['reviewed']:
                    if settings.REVIEW_NEW_ITEMS:
                        self.review()
                    else:
                        yield DoorstopInfo("needs initial review")
                else:
                    yield DoorstopWarning("unreviewed changes")

        # Reformat the file
        if settings.REFORMAT:
            log.debug("reformatting item %s...", self)
            self.save()

    def _get_issues_document(self, document, skip):
        """Yield all the item's issues against its document."""
        log.debug("getting issues against document...")

        if document in skip:
            log.debug("skipping issues against document %s...", document)
            return

        # Verify an item's UID matches its document's prefix
        if self.prefix != document.prefix:
            msg = "prefix differs from document ({})".format(document.prefix)
            yield DoorstopInfo(msg)

        # Verify that normative, non-derived items in a child document have at
        # least one link.  It is recommended that these items have an upward
        # link to an item in the parent document, however, this is not
        # enforced.  An info message is generated if this is not the case.
        if all((document.parent, self.normative, not self.derived)) and not self.links:
            msg = "no links to parent document: {}".format(document.parent)
            yield DoorstopWarning(msg)

        # Verify an item's links are to the correct parent
        for uid in self.links:
            try:
                prefix = uid.prefix
            except DoorstopError:
                msg = "invalid UID in links: {}".format(uid)
                yield DoorstopError(msg)
            else:
                if document.parent and prefix != document.parent:
                    # this is only 'info' because a document is allowed
                    # to contain items with a different prefix, but
                    # Doorstop will not create items like this
                    msg = "parent is '{}', but linked to: {}".format(
                        document.parent, uid
                    )
                    yield DoorstopInfo(msg)

    def _get_issues_tree(self, tree):
        """Yield all the item's issues against its tree."""
        log.debug("getting issues against tree...")

        # Verify an item's links are valid
        identifiers = set()
        for uid in self.links:
            try:
                item = tree.find_item(uid)
            except DoorstopError:
                identifiers.add(uid)  # keep the invalid UID
                msg = "linked to unknown item: {}".format(uid)
                yield DoorstopError(msg)
            else:
                # check the linked item
                if not item.active:
                    msg = "linked to inactive item: {}".format(item)
                    yield DoorstopInfo(msg)
                if not item.normative:
                    msg = "linked to non-normative item: {}".format(item)
                    yield DoorstopWarning(msg)
                # check the link status
                if uid.stamp == Stamp(True):
                    uid.stamp = item.stamp()
                elif not str(uid.stamp) and settings.STAMP_NEW_LINKS:
                    uid.stamp = item.stamp()
                elif uid.stamp != item.stamp():
                    if settings.CHECK_SUSPECT_LINKS:
                        msg = "suspect link: {}".format(item)
                        yield DoorstopWarning(msg)
                # reformat the item's UID
                identifier2 = UID(item.uid, stamp=uid.stamp)
                identifiers.add(identifier2)

        # Apply the reformatted item UIDs
        if settings.REFORMAT:
            self._data['links'] = identifiers

    def _get_issues_both(self, document, tree, skip):
        """Yield all the item's issues against its document and tree."""
        log.debug("getting issues against document and tree...")

        if document.prefix in skip:
            log.debug("skipping issues against document %s...", document)
            return

        # Verify an item is being linked to (child links)
        if settings.CHECK_CHILD_LINKS and self.normative:
            find_all = settings.CHECK_CHILD_LINKS_STRICT or False
            items, documents = self._find_child_objects(
                document=document, tree=tree, find_all=find_all
            )

            if not items:
                for child_document in documents:
                    if document.prefix in skip:
                        msg = "skipping issues against document %s..."
                        log.debug(msg, child_document)
                        continue
                    msg = "no links from child document: {}".format(child_document)
                    yield DoorstopWarning(msg)
            elif settings.CHECK_CHILD_LINKS_STRICT:
                prefix = [item.prefix for item in items]
                for child in document.children:
                    if child in skip:
                        continue
                    if child not in prefix:
                        msg = 'no links from document: {}'.format(child)
                        yield DoorstopWarning(msg)

    @requires_tree
    def find_ref(self):
        """Get the external file reference and line number.

        :raises: :class:`~doorstop.common.DoorstopError` when no
            reference is found

        :return: relative path to file or None (when no reference
            set),
            line number (when found in file) or None (when found as
            filename) or None (when no reference set)

        """
        # Return immediately if no external reference
        if not self.ref:
            log.debug("no external reference to search for")
            return None, None
        # Update the cache
        if not settings.CACHE_PATHS:
            pyficache.clear_file_cache()
        # Search for the external reference
        log.debug("seraching for ref '{}'...".format(self.ref))
        pattern = r"(\b|\W){}(\b|\W)".format(re.escape(self.ref))
        log.trace("regex: {}".format(pattern))
        regex = re.compile(pattern)
        for path, filename, relpath in self.tree.vcs.paths:
            # Skip the item's file while searching
            if path == self.path:
                continue
            # Check for a matching filename
            if filename == self.ref:
                return relpath, None
            # Skip extensions that should not be considered text
            if os.path.splitext(filename)[-1] in settings.SKIP_EXTS:
                continue
            # Search for the reference in the file
            lines = pyficache.getlines(path)
            if lines is None:
                log.trace("unable to read lines from: {}".format(path))
                continue
            for lineno, line in enumerate(lines, start=1):
                if regex.search(line):
                    log.debug("found ref: {}".format(relpath))
                    return relpath, lineno

        msg = "external reference not found: {}".format(self.ref)
        raise DoorstopError(msg)

    def find_child_links(self, find_all=True):
        """Get a list of item UIDs that link to this item (reverse links).

        :param find_all: find all items (not just the first) before returning

        :return: list of found item UIDs

        """
        items, _ = self._find_child_objects(find_all=find_all)
        identifiers = [item.uid for item in items]
        return identifiers

    child_links = property(find_child_links)

    def find_child_items(self, find_all=True):
        """Get a list of items that link to this item.

        :param find_all: find all items (not just the first) before returning

        :return: list of found items

        """
        items, _ = self._find_child_objects(find_all=find_all)
        return items

    child_items = property(find_child_items)

    def find_child_documents(self):
        """Get a list of documents that should link to this item's document.

        :return: list of found documents

        """
        _, documents = self._find_child_objects(find_all=False)
        return documents

    child_documents = property(find_child_documents)

    def _find_child_objects(self, document=None, tree=None, find_all=True):
        """Get lists of child items and child documents.

        :param document: document containing the current item
        :param tree: tree containing the current item
        :param find_all: find all items (not just the first) before returning

        :return: list of found items, list of all child documents

        """
        child_items = []
        child_documents = []
        document = document or self.document
        tree = tree or self.tree
        if not document or not tree:
            return child_items, child_documents
        # Find child objects
        log.debug("finding item {}'s child objects...".format(self))
        for document2 in tree:
            if document2.parent == document.prefix:
                child_documents.append(document2)
                # Search for child items unless we only need to find one
                if not child_items or find_all:
                    for item2 in document2:
                        if self.uid in item2.links:
                            if not item2.active:
                                item2 = UnknownItem(item2.uid)
                                log.warning(item2.exception)
                                child_items.append(item2)
                            else:
                                child_items.append(item2)
                                if not find_all and item2.active:
                                    break
        # Display found links
        if child_items:
            if find_all:
                joined = ', '.join(str(i) for i in child_items)
                msg = "child items: {}".format(joined)
            else:
                msg = "first child item: {}".format(child_items[0])
            log.debug(msg)
            joined = ', '.join(str(d) for d in child_documents)
            log.debug("child documents: {}".format(joined))
        return sorted(child_items), child_documents

    @auto_load
    def stamp(self, links=False):
        """Hash the item's key content for later comparison."""
        values = [self.uid, self.text, self.ref]
        if links:
            values.extend(self.links)
        for key in self.document.extended_reviewed:
            if key in self._data:
                values.append(self._dump(self._data[key]))
            else:
                log.warning(
                    "{}: missing extended reviewed attribute: {}".format(self.uid, key)
                )
        return Stamp(*values)

    @auto_save
    def clear(self, parents=None):
        """Clear suspect links."""
        log.info("clearing suspect links...")
        for uid, item in self._get_parent_uid_and_item():
            if not parents or uid in parents:
                uid.stamp = item.stamp()

    @auto_save
    def review(self):
        """Mark the item as reviewed."""
        log.info("marking item as reviewed...")
        self._data['reviewed'] = self.stamp(links=True)

    @delete_item
    def delete(self, path=None):
        """Delete the item."""


class UnknownItem:
    """Represents an unknown item, which doesn't have a path."""

    UNKNOWN_PATH = '???'  # string to represent an unknown path

    normative = False  # do not include unknown items in traceability
    level = Item.DEFAULT_LEVEL

    def __init__(self, value, spec=Item):
        self._uid = UID(value)
        self._spec = dir(spec)  # list of attribute names for warnings
        msg = UID.UNKNOWN_MESSAGE.format(k='', u=self.uid)
        self.exception = DoorstopError(msg)

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

    def __getattr__(self, name):
        if name in self._spec:
            log.debug(self.exception)
        return self.__getattribute__(name)

    def __lt__(self, other):
        return self.uid < other.uid

    @property
    def uid(self):
        """Get the item's UID."""
        return self._uid

    prefix = Item.prefix
    number = Item.number

    @property
    def relpath(self):
        """Get the unknown item's relative path string."""
        return "@{}{}".format(os.sep, self.UNKNOWN_PATH)

    def stamp(self):  # pylint: disable=R0201
        """Return an empty stamp."""
        return Stamp(None)

jacebrowning / doorstop

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