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#
# Copyright (C) 2018 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
import os
from . import _yaml
from ._exceptions import LoadError, LoadErrorReason
# ProjectRefStorage()
#
# Indicates the type of ref storage
class ProjectRefStorage():
# Source references are stored inline
#
INLINE = 'inline'
# Source references are stored in a central project.refs file
#
PROJECT_REFS = 'project.refs'
# ProjectRefs()
#
# The project.refs file management
#
# Args:
# directory (str): The project directory
# base_name (str): The project.refs basename
#
class ProjectRefs():
def __init__(self, directory, base_name):
directory = os.path.abspath(directory)
self._fullpath = os.path.join(directory, base_name)
self._base_name = base_name
self._toplevel_node = None
self._toplevel_save = None
# load()
#
# Load the project.refs file
#
# Args:
# options (OptionPool): To resolve conditional statements
#
def load(self, options):
try:
self._toplevel_node = _yaml.load(self._fullpath, shortname=self._base_name, copy_tree=True)
provenance = _yaml.node_get_provenance(self._toplevel_node)
self._toplevel_save = provenance.toplevel
# Process any project options immediately
options.process_node(self._toplevel_node)
# Run any final assertions on the project.refs, just incase there
# are list composition directives or anything left unprocessed.
_yaml.node_final_assertions(self._toplevel_node)
except LoadError as e:
if e.reason != LoadErrorReason.MISSING_FILE:
raise
# Ignore failure if the file doesnt exist, it'll be created and
# for now just assumed to be empty
self._toplevel_node = _yaml.new_synthetic_file(self._fullpath)
self._toplevel_save = self._toplevel_node
_yaml.node_validate(self._toplevel_node, ['projects'])
# Ensure we create our toplevel entry point on the fly here
for node in [self._toplevel_node, self._toplevel_save]:
if 'projects' not in node:
_yaml.node_set(node, 'projects', _yaml.new_empty_node(ref_node=node))
# lookup_ref()
#
# Fetch the ref node for a given Source. If the ref node does not
# exist and `write` is specified, it will be automatically created.
#
# Args:
# project (str): The project to lookup
# element (str): The element name to lookup
# source_index (int): The index of the Source in the specified element
# write (bool): Whether we want to read the node or write to it
#
# Returns:
# (node): The YAML dictionary where the ref is stored
#
def lookup_ref(self, project, element, source_index, *, write=False):
node = self._lookup(self._toplevel_node, project, element, source_index)
if write:
# If we couldnt find the orignal, create a new one.
#
if node is None:
node = self._lookup(self._toplevel_save, project, element, source_index, ensure=True)
return node
# _lookup()
#
# Looks up a ref node in the project.refs file, creates one if ensure is True.
#
def _lookup(self, toplevel, project, element, source_index, *, ensure=False):
# Fetch the project
try:
projects = _yaml.node_get(toplevel, dict, 'projects')
project_node = _yaml.node_get(projects, dict, project)
except LoadError:
if not ensure:
return None
project_node = _yaml.new_empty_node(ref_node=projects)
_yaml.node_set(projects, project, project_node)
# Fetch the element
try:
element_list = _yaml.node_get(project_node, list, element)
except LoadError:
if not ensure:
return None
element_list = []
_yaml.node_set(project_node, element, element_list)
# Fetch the source index
try:
node = element_list[source_index]
except IndexError:
if not ensure:
return None
# Pad the list with empty newly created dictionaries
_yaml.node_extend_list(project_node, element, source_index + 1, {})
node = _yaml.node_get(project_node, dict, element, indices=[source_index])
return node
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