def from_natural_text(cls, text):
"""
Return EDTF string equivalent of a given natural language date string.
"""
if not text:
return cls()
t = text.lower()
# try parsing the whole thing
result = EDTFDate.from_natural_text(t)
if not result:
# split by list delims and move fwd with the first thing that returns a non-empty string.
for split in [",", ";", "or"]:
for list_item in t.split(split):
# try parsing as an interval - split by '-'
toks = list_item.split("-")
if len(toks) == 2:
d1 = toks[0].strip()
d2 = toks[1].strip()
if re.match(r'^\d\D\b', d2): # 1-digit year partial e.g. 1868-9
if re.match(r'\b\d\d\d\d$', d1): #TODO: evaluate it and see if it's a year
d2 = d1[-4:-1] + d2
elif re.match(r'^\d\d\b', d2): # 2-digit year partial e.g. 1809-10
if re.match(r'\b\d\d\d\d$', d1):
d2 = d1[-4:-2] + d2
r1 = EDTFDate.from_natural_text(d1)
r2 = EDTFDate.from_natural_text(d2)
if r1 and r2:
return cls(r1+"/"+r2)
elif re.match(r"\d\d\d\d\/\d\d\d\d", t):
return cls(t) # already a 2-year interval
result = EDTFDate.from_natural_text(list_item)
if result:
break
if result:
break
else:
return cls()
is_before = re.findall(r'\bbefore\b', t)
is_before = is_before or re.findall(r'\bearlier\b', t)
is_after = re.findall(r'\bafter\b', t)
is_after = is_after or re.findall(r'\bsince\b', t)
is_after = is_after or re.findall(r'\blater\b', t)
if is_before:
result = u"unknown/%s" % result
elif is_after:
result = u"%s/unknown" % result
return cls(result)
def parse_text(self, text):
if not text:
self.date_obj = EDTFDate()
elif "/" in text:
self.date_obj = EDTFInterval(text)
else:
self.date_obj = EDTFDate(text)
class EDTF(object):
def __init__(self, text=None):
self.date_obj = None
self.parse_text(text)
@property
def is_interval(self):
return isinstance(self.date_obj, EDTFInterval)
def parse_text(self, text):
if not text:
self.date_obj = EDTFDate()
elif "/" in text:
self.date_obj = EDTFInterval(text)
else:
self.date_obj = EDTFDate(text)
def __unicode__(self):
return unicode(self.date_obj)
def sort_date_earliest(self):
return self.date_obj.sort_date_earliest()
def sort_date_latest(self):
return self.date_obj.sort_date_latest()
def start_date_earliest(self):
if self.is_interval:
return self.date_obj.start_date_earliest()
else:
return self.date_obj.date_earliest()
date_earliest = start_date_earliest
def start_date_latest(self):
if self.is_interval:
return self.date_obj.start_date_latest()
else:
return self.date_obj.date_earliest()
def end_date_earliest(self):
if self.is_interval:
return self.date_obj.end_date_earliest()
else:
return self.date_obj.date_latest()
def end_date_latest(self):
if self.is_interval:
return self.date_obj.end_date_latest()
else:
return self.date_obj.date_latest()
date_latest = end_date_latest
@classmethod
def from_natural_text(cls, text):
"""
Return EDTF string equivalent of a given natural language date string.
"""
if not text:
return cls()
t = text.lower()
# try parsing the whole thing
result = EDTFDate.from_natural_text(t)
if not result:
# split by list delims and move fwd with the first thing that returns a non-empty string.
for split in [",", ";", "or"]:
for list_item in t.split(split):
# try parsing as an interval - split by '-'
toks = list_item.split("-")
if len(toks) == 2:
d1 = toks[0].strip()
d2 = toks[1].strip()
if re.match(r'^\d\D\b', d2): # 1-digit year partial e.g. 1868-9
if re.match(r'\b\d\d\d\d$', d1): #TODO: evaluate it and see if it's a year
d2 = d1[-4:-1] + d2
elif re.match(r'^\d\d\b', d2): # 2-digit year partial e.g. 1809-10
if re.match(r'\b\d\d\d\d$', d1):
d2 = d1[-4:-2] + d2
r1 = EDTFDate.from_natural_text(d1)
r2 = EDTFDate.from_natural_text(d2)
if r1 and r2:
return cls(r1+"/"+r2)
elif re.match(r"\d\d\d\d\/\d\d\d\d", t):
return cls(t) # already a 2-year interval
result = EDTFDate.from_natural_text(list_item)
if result:
break
if result:
break
else:
return cls()
is_before = re.findall(r'\bbefore\b', t)
is_before = is_before or re.findall(r'\bearlier\b', t)
is_after = re.findall(r'\bafter\b', t)
is_after = is_after or re.findall(r'\bsince\b', t)
is_after = is_after or re.findall(r'\blater\b', t)
if is_before:
result = u"unknown/%s" % result
elif is_after:
result = u"%s/unknown" % result
return cls(result)