/usr/lib/python3/dist-packages/drslib/translate.py is in python3-drslib 0.3.0a3-5build1.
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# Copyright (c) 2010, Science & Technology Facilities Council (STFC)
# All rights reserved.
#
# See the LICENSE file in the source distribution of this software for
# the full license text.
"""
A framework for translating DRS objects to and from filenames and paths.
This module is very object-heavy and over engineered. However, it does the job.
"""
import re, os
import logging
log = logging.getLogger(__name__)
from drslib.drs import DRS
from drslib.config import CMIP5_DRS, CMIP5_CMOR_DRS
class TranslationError(Exception):
pass
class TranslatorContext(object):
"""
Represents a DRS URL or path being translated.
:ivar path_parts: A list of directories following the DRS prefix
:ivar file_parts: A list of '_'-separated parts of the filename
:ivar drs: The DRS of interest
:ivar table_store: The mip tables being used.
"""
def __init__(self, filename=None, path=None, drs=None, table_store=None):
if path is None:
self.path_parts = [None] * 12
else:
self.path_parts = path.split('/')
if filename is None:
self.file_parts = [None] * 7
else:
self.file_parts = os.path.splitext(filename)[0].split('_')
# Work-arround because CMOR encodes 'clim' as flag as _clim
if self.file_parts[-1] == 'clim':
self.file_parts[-2:] = [self.file_parts[-2] + '-clim']
if drs is None:
self.drs = DRS()
else:
self.drs = drs
self.table_store = table_store
def set_drs_component(self, drs_component, value):
"""
Set a DRS component checking that the value doesn't conflict
with any current value.
"""
v = self.drs[drs_component]
if v is None:
setattr(self.drs, drs_component, value)
else:
if v != value:
raise TranslationError('Conflicting value of DRS component %s' % drs_component)
def path_to_string(self):
self._trim_parts()
parts = self.path_parts
return os.path.join(*parts)
def file_to_string(self):
# To allow optional portions any None's are removed
fp = [x for x in self.file_parts if x is not None]
# Check there is at last 1 item in the list
assert len(fp) > 0
return '_'.join(fp)+'.nc'
def to_string(self):
"""Returns the full DRS path and filename.
"""
self._trim_parts()
return os.path.join(self.path_to_string(), self.file_to_string())
def _trim_parts(self):
"""Remove extranious Nones from path_parts and file_parts.
"""
while self.path_parts[-1] is None:
self.path_parts.pop()
while self.file_parts[-1] is None:
self.file_parts.pop()
class BaseComponentTranslator(object):
"""
Each component is translated by a separate IComponentTranslator object.
"""
def __init__(self, table_store=None):
self.table_store = table_store
def filename_to_drs(self, context):
"""
Translate the relevant component of the filename to a drs component.
:raises TranslationError: if the filename is invalid
:returns: context
"""
raise NotImplementedError
def path_to_drs(self, context):
"""
Translate the relevant component of the DRS path to a drs component.
:raises TranslationError: if the path is invalid
:returns: context
"""
raise NotImplementedError
def drs_to_filepath(self, context):
"""
Sets context.path_parts and context.file_parts for this component.
:returns: context
"""
raise NotImplementedError
class GenericComponentTranslator(BaseComponentTranslator):
"""
The simplest type of translator just validating strings
"""
# Class attributes set in subclasses
path_i = NotImplemented
file_i = NotImplemented
component = NotImplemented
vocab = NotImplemented
def filename_to_drs(self, context):
if self.file_i is not None:
try:
s = self._validate(context.file_parts[self.file_i])
except IndexError:
raise TranslationError("Filename contains too few components")
context.set_drs_component(self.component, s)
def path_to_drs(self, context):
if self.path_i is not None:
s = self._validate(context.path_parts[self.path_i])
context.set_drs_component(self.component, s)
def drs_to_filepath(self, context):
s = self._validate(context.drs[self.component])
if self.path_i is not None:
context.path_parts[self.path_i] = s
if self.file_i is not None:
context.file_parts[self.file_i] = s
#----
def _validate(self, s):
if self.vocab is None:
return s
if s not in self.vocab:
raise TranslationError('Component value %s not in vocabulary of component %s' % (s, self.component))
return s
class CMORVarTranslator(BaseComponentTranslator):
"""
CMIP Variable translator
For CMIP5, each variable is uniquely identified by a combination
of two strings: 1) a name associated generically with the variable
(typically, as recorded in the netCDF file ? e.g., tas, pr, ua),
and 2) the name of the CMOR variable table (e.g., Amon, da, aero)
in which the variable appears. Together these two strings ensure
that the variable is uniquely 4 defined. There are some
applications in which the second string might be unnecessary
(e.g., for CMIP5, this will be omitted from the directory
structure). Note that for CMIP5 a hyphen ('-') is forbidden to be
included anywhere in the first string.
"""
file_var_i = CMIP5_CMOR_DRS.FILE_VARIABLE
file_table_i = CMIP5_CMOR_DRS.FILE_TABLE
path_var_i = CMIP5_CMOR_DRS.PATH_VARIABLE
def filename_to_drs(self, context):
varname = context.file_parts[self.file_var_i]
table = context.file_parts[self.file_table_i]
#!TODO: table checking
context.set_drs_component('variable', varname)
context.set_drs_component('table', table)
def path_to_drs(self, context):
varname = context.file_parts[self.file_var_i]
#!TODO: table checking
context.set_drs_component('variable', varname)
def drs_to_filepath(self, context):
context.file_parts[self.file_var_i] = context.drs.variable
context.file_parts[self.file_table_i] = context.drs.table
context.path_parts[self.path_var_i] = context.drs.variable
#----
class VersionedVarTranslator(CMORVarTranslator):
file_var_i = CMIP5_DRS.FILE_VARIABLE
file_table_i = CMIP5_DRS.FILE_TABLE
path_var_i = CMIP5_DRS.PATH_VARIABLE
path_table_i = CMIP5_DRS.PATH_TABLE
def path_to_drs(self, context):
super(VersionedVarTranslator, self).path_to_drs(context)
tablename = context.path_parts[self.path_table_i]
context.set_drs_component('table', tablename)
def drs_to_filepath(self, context):
super(VersionedVarTranslator, self).drs_to_filepath(context)
context.path_parts[self.path_table_i] = context.drs.table
class EnsembleTranslator(BaseComponentTranslator):
file_i = CMIP5_CMOR_DRS.FILE_ENSEMBLE
path_i = CMIP5_CMOR_DRS.PATH_ENSEMBLE
def filename_to_drs(self, context):
context.drs.ensemble = self._convert(context.file_parts[self.file_i])
def path_to_drs(self, context):
context.drs.ensemble = self._convert(context.path_parts[self.path_i])
def drs_to_filepath(self, context):
(r, i, p) = context.drs.ensemble
a = ['r%d' % r]
if i is not None:
a.append('i%d' % i)
if p is not None:
a.append('p%d' % p)
v = ''.join(a)
context.file_parts[self.file_i] = v
context.path_parts[self.path_i] = v
#----
def _convert(self, component):
mo = re.match(r'(?:r(\d+))?(?:i(\d+))?(?:p(\d+))?', component)
if not mo:
raise TranslationError('Unrecognised ensemble syntax %s' % component)
(r, i, p) = mo.groups()
return (_int_or_none(r), _int_or_none(i), _int_or_none(p))
class VersionedEnsembleTranslator(EnsembleTranslator):
file_i = CMIP5_DRS.FILE_ENSEMBLE
path_i = CMIP5_DRS.PATH_ENSEMBLE
class VersionTranslator(BaseComponentTranslator):
def filename_to_drs(self, context):
pass
def path_to_drs(self, context):
context.drs.version = self._convert(context.path_parts[CMIP5_DRS.PATH_VERSION])
def drs_to_filepath(self, context):
if context.drs.version is not None:
context.path_parts[CMIP5_DRS.PATH_VERSION] = 'v%d' % context.drs.version
#----
def _convert(self, component):
mo = re.match(r'v(\d+)', component)
if not mo:
raise TranslationError('Unrecognised version syntax %s' % component)
try:
v = int(mo.group(1))
except TypeError:
raise TranslationError('Unrecognised version syntax %s' % component)
return v
class SubsetTranslator(BaseComponentTranslator):
"""
Currently just temporal subsets
:cvar allow_missing_subset: A boolean value configuring whether to
complain if the subset is missing.
"""
allow_missing_subset = True
def filename_to_drs(self, context):
try:
v = context.file_parts[CMIP5_DRS.FILE_SUBSET]
except IndexError:
if self.allow_missing_subset:
return
else:
raise TranslationError('Missing temporal subset')
mo = re.match(r'(\d+)(?:-(\d+))?(-clim)?', v)
if not mo:
raise TranslationError('Unrecognised temporal subset %s' % v)
n1, n2, clim = mo.groups()
if clim:
clim=True
context.drs.subset = (_to_date(n1), _to_date(n2), clim)
def path_to_drs(self, component):
pass
def drs_to_filepath(self, context):
if self.allow_missing_subset and context.drs.subset is None:
return
(n1, n2, clim) = context.drs.subset
parts = []
parts.append(_from_date(n1))
if n2:
parts.append(_from_date(n2))
if clim:
parts.append('clim')
context.file_parts[CMIP5_DRS.FILE_SUBSET] = '-'.join(parts)
class Translator(object):
"""
An abstract class for translating between filepaths and
:class:`drslib.drs.DRS` objects.
Concrete subclasses are returned by factory functions such as
:mod:`drslib.cmip5.make_translator`.
:property prefix: The prefix for all DRS paths including the
activity. All paths are interpreted as relative to this
prefix. Generated paths have this prefix added.
:property table_store: A :class:`drslib.mip_table.MIPTableStore`
object containing all MIP tables being used.
"""
ContextClass = TranslatorContext
def __init__(self, prefix='', table_store=None):
self.prefix = prefix
self.table_store = table_store
def filename_to_drs(self, filename, context=None):
"""
Translate a filename into a :class:`drslib.drs.DRS` object.
Only those DRS components known from the filename will be set.
"""
if context is None:
context = self.ContextClass(filename=filename, drs=self.init_drs(),
table_store = self.table_store)
for t in self.translators:
t.filename_to_drs(context)
return context.drs
def path_to_drs(self, path, context=None):
"""
Translate a directory path into a :class:`drslib.drs.DRS`
object.
Only those DRS components known from the path will be set.
"""
if context is None:
context = self.ContextClass(path=self._split_prefix(path), drs=self.init_drs(),
table_store = self.table_store)
for t in self.translators:
t.path_to_drs(context)
return context.drs
def filepath_to_drs(self, filepath, context=None):
"""
Translate a full filepath to a :class:`drslib.drs.DRS` object.
"""
filepath = self._split_prefix(filepath)
path, filename = os.path.split(filepath)
if context is None:
context = self.ContextClass(filename=filename, path=path, drs=self.init_drs(),
table_store = self.table_store)
for t in self.translators:
t.path_to_drs(context)
t.filename_to_drs(context)
return context.drs
def drs_to_context(self, drs):
context = self.ContextClass(drs=self.init_drs(drs), table_store = self.table_store)
for t in self.translators:
t.drs_to_filepath(context)
return context
def drs_to_filepath(self, drs):
"""
Translate a :class:`drslib.drs.DRS` object into a full filepath.
"""
context = self.drs_to_context(drs)
return os.path.join(self.prefix, context.to_string())
def drs_to_path(self, drs):
"""
Translate a :class:`drslib.drs.DRS` object into a directory path.
"""
context = self.drs_to_context(drs)
return os.path.join(self.prefix, context.path_to_string())
def drs_to_file(self, drs):
"""
Translate a :class:`drslib.drs.DRS` object into a filename.
"""
context = self.drs_to_context(drs)
return context.file_to_string()
def _split_prefix(self, path):
n = len(self.prefix)
if path[:n] == self.prefix:
return path[n:].lstrip('/')
else:
log.warn('Path %s does not have prefix %s' % (path, self.prefix))
return path
def init_drs(self):
"""
Returns an empty DRS instance initialised for this translator.
This class must be overloaded in subclasses.
"""
raise NotImplementedError
def _to_date(date_str):
mo = re.match(r'(\d{4})(\d{2})?(\d{2})?(\d{2})?(\d{2})?', date_str)
if not mo:
raise ValueError()
(y, m, d, h, mn) = mo.groups()
return (int(y), _int_or_none(m), _int_or_none(d), _int_or_none(h), _int_or_none(mn))
def _from_date(date):
(y, m, d, h, mn) = date
ret = ['%04d' % y]
if m is not None:
ret.append('%02d' % m)
if d is not None:
ret.append('%02d' % d)
if h is not None:
ret.append('%02d' % h)
if mn is not None:
ret.append('%02d' % mn)
return ''.join(ret)
def _int_or_none(x):
if x is None:
return None
else:
return int(x)
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