#!/usr/bin/env python
"""
Created on Fri Jan 23 12:11:23 2015
@author: zah
"""
import fnmatch
from functools import lru_cache
import glob
import os
import os.path as osp
from pathlib import Path
import re
from validphys.lhapdf_compatibility import lhapdf
from validphys.utils import yaml_safe
_indexes_to_names = None
_names_to_indexes = None
[docs]
def expand_index_names(globstr):
return fnmatch.filter(get_names_to_indexes().keys(), globstr)
[docs]
def expand_local_names(globstr):
paths = lhapdf.paths()
return [
name
for path in paths
for name in glob.glob1(path, globstr)
if osp.isdir(osp.join(path, name))
]
[docs]
def expand_names(globstr):
"""Return names of installed PDFs. If none is found,
return names from index"""
names = expand_local_names(globstr)
if not names:
names = expand_index_names(globstr)
return names
[docs]
def get_indexes_to_names():
global _indexes_to_names
if _indexes_to_names is None:
_indexes_to_names = parse_index(get_index_path())
return _indexes_to_names
[docs]
def finddir(name):
for path in lhapdf.paths():
d = osp.join(path, name)
if osp.isdir(d):
return d
raise FileNotFoundError(name)
[docs]
def isinstalled(name):
"""Check that name exists in LHAPDF dir"""
return name and any(osp.isdir(osp.join(path, name)) for path in lhapdf.paths())
[docs]
def get_names_to_indexes():
global _names_to_indexes
if _names_to_indexes is None:
_names_to_indexes = {name: index for index, name in get_indexes_to_names().items()}
return _names_to_indexes
[docs]
def get_pdf_indexes(name):
"""Get index in the amc@nlo format"""
info = parse_info(name)
ind = info['SetIndex']
num_members = info['NumMembers']
return {
'lhapdf_id': ind,
'lhapdf_min': ind + (num_members > 1),
'lhapdf_max': ind + num_members - 1,
}
[docs]
def get_pdf_name(index):
return get_indexes_to_names()[str(index)]
[docs]
def parse_index(index_file):
d = {}
name_re = r'(\d+)\s+(\S+)'
with open(index_file) as localfile:
for line in localfile.readlines():
m = re.match(name_re, line)
index = m.group(1)
d[index] = m.group(2)
return d
[docs]
def get_collaboration(name):
try:
col = name[: name.index('_')]
except ValueError:
col = name
return col
[docs]
def as_from_name(name):
"""Annoying function needed because this is not in the info files. as(M_z)
there is actually as(M_ref)."""
match = re.search(r'as[_]?([^_\W]+)\_?', name)
if match:
return match.group(1)
else:
return name
[docs]
def infofilename(name):
for path in lhapdf.paths():
info = osp.join(path, name, name + '.info')
if osp.exists(info):
return info
raise FileNotFoundError(name + ".info")
[docs]
@lru_cache
def parse_info(name):
with open(infofilename(name)) as infofile:
result = yaml_safe.load(infofile)
return result
[docs]
def get_lha_datapath():
"""Return an existing datapath from LHAPDF, starting from the end.
If no path is found to exist, recover the old behaviour and returns the last path.
The check for existence intends to solve problems where a previously filled `LHAPATH`
or `LHAPDF_DATA_PATH` environment variable is pointing to a non-existent path or shared
systems where LHAPDF might be compiled with hard-coded paths not available to all users.
"""
for lhapath in lhapdf.paths()[::-1]:
if Path(lhapath).exists():
return lhapath
return lhapdf.paths()[-1]
[docs]
def get_index_path(folder=None):
if folder:
index_file = os.path.join(folder, 'pdfsets.index')
if folder is None or not osp.exists(index_file):
folder = get_lha_datapath()
index_file = os.path.join(folder, 'pdfsets.index')
return index_file