From a553cea6951d2e226fa5863918574f2f4e498bee Mon Sep 17 00:00:00 2001
From: Marcin Koziej <marcin@koziej.info>
Date: Wed, 6 Nov 2013 15:19:50 +0100
Subject: [PATCH 1/1] Handle all date formats in a primitive way (always take
 the beginning of period)

---
 librarian/dcparser.py  | 33 +++++++++++++++++++++++++++++----
 tests/test_dcparser.py | 13 ++++++++++---
 2 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/librarian/dcparser.py b/librarian/dcparser.py
index 079c434..1df1e5a 100644
--- a/librarian/dcparser.py
+++ b/librarian/dcparser.py
@@ -63,19 +63,44 @@ class Person(object):
         return 'Person(last_name=%r, first_names=*%r)' % (self.last_name, self.first_names)
 
 def as_date(text):
+    """Dates for digitization of pictures. It seems we need the following:
+ranges:		'1350-1450',
+centuries:	"XVIII w.'
+half centuries/decades: '2 poł. XVIII w.', 'XVII w., l. 20'
+later-then: 'po 1450'
+circa 'ok. 1813-1814', 'ok.1876-ok.1886
+turn: 1893/1894
+for now we will translate this to some single date losing information of course.
+    """
     try:
         # check out the "N. poł X w." syntax
         if isinstance(text, str): text = text.decode("utf-8")
-        m = re.match(u"([12]) *poł[.]? ([MCDXVI]+) *w[.]?", text)
+        century_format = u"(?:([12]) *poł[.]? +)?([MCDXVI]+) *w[.,]*(?: *l[.]? *([0-9]+))?"
+        vague_format = u"(?:po *|ok. *)([0-9]+)"
+
+        m = re.match(century_format, text)
+        m2 = re.match(vague_format, text)
         if m:
-            half = int(m.groups()[0])
-            century = roman_to_int(str(m.groups()[1]))
-            t = ((century*100 + (half-1)*50), 1, 1)
+            half = m.group(1)
+            decade = m.group(3)
+            century = roman_to_int(str(m.group(2)))
+            if half is not None:
+                if decade is not None:
+                    raise ValueError("Bad date format. Cannot specify both half and decade of century")
+                half = int(half)
+                t = ((century*100 + (half-1)*50), 1, 1)
+            else:
+                decade = int(decade or 0)
+                t = ((century*100 + decade), 1, 1)
+        elif m2:
+            year = int(m2.group(1))
+            t = (year, 1, 1)
         else:
             try:
                 t = time.strptime(text, '%Y-%m-%d')
             except ValueError:
                 t = time.strptime(text, '%Y')
+
         return date(t[0], t[1], t[2])
     except ValueError, e:
         raise ValueError("Unrecognized date format. Try YYYY-MM-DD or YYYY.")
diff --git a/tests/test_dcparser.py b/tests/test_dcparser.py
index a0845a0..734c0b9 100644
--- a/tests/test_dcparser.py
+++ b/tests/test_dcparser.py
@@ -46,7 +46,14 @@ def test_serialize():
     for fixture in get_all_fixtures('dcparser', '*.xml'):
         yield check_serialize, fixture
 
-def test_as_date():
+def test_asdate():
     assert_equals(dcparser.as_date(u"2010-10-03"), date(2010, 10, 03))
-    assert_equals(dcparser.as_date("2011"), date(2011, 1, 1))
-    assert_equals(dcparser.as_date("2 poł. XIX w."), date(1950, 1, 1))
+    assert_equals(dcparser.as_date(u"2011"), date(2011, 1, 1))
+    assert_equals(dcparser.as_date(u"2 poł. XIX w."), date(1950, 1, 1))
+    assert_equals(dcparser.as_date(u"XVII w., l. 20"), date(1720, 1, 1))
+    import pdb; pdb.set_trace()
+    assert_equals(dcparser.as_date(u"po 1460"), date(1460, 1, 1))
+    assert_equals(dcparser.as_date(u"ok. 1813-1814"), date(1813, 1, 1))
+    assert_equals(dcparser.as_date(u"ok.1876-ok.1886"), date(1876, 1, 1))
+    assert_equals(dcparser.as_date(u"1893/1894"), date(1893, 1, 1))
+    
-- 
2.20.1