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Merge pull request #149 from wtty-fool/feature/maya-long-count

Maya Long Count
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timofurrer committed Nov 5, 2019
2 parents 42eb6fb + 8493dd7 commit 11c0d683d7ca17ebddc680543d82414d40e77178
Showing with 41 additions and 0 deletions.
  1. +26 −0 src/maya/core.py
  2. +15 −0 tests/test_maya.py
@@ -212,6 +212,16 @@ def from_iso8601(klass, iso8601_string):
"""Returns MayaDT instance from iso8601 string."""
return parse(iso8601_string)

@classmethod
def from_long_count(klass, long_count_string):
"""Returns MayaDT instance from Maya Long Count string."""
days_since_creation = -1856305
factors = (144000, 7200, 360, 20, 1)
for i, value in enumerate(long_count_string.split('.')):
days_since_creation += int(value) * factors[i]
days_since_creation *= 3600 * 24
return klass(epoch=days_since_creation)

@staticmethod
def from_rfc2822(rfc2822_string):
"""Returns MayaDT instance from rfc2822 string."""
@@ -269,6 +279,22 @@ def rfc3339(self):
"""Returns an RFC 3339 representation of the MayaDT."""
return self.datetime().strftime("%Y-%m-%dT%H:%M:%S.%f")[:-5] + "Z"

def long_count(self):
"""Returns a Mayan Long Count representation of the Maya DT."""
# Creation (0.0.0.0.0) occurred on -3114-08-11
# 1856305 is distance (in days) between Creation and UNIX epoch
days_since_creation = int(1856305 + self._epoch / (3600*24))
caps = (0, 20, 20, 18, 20)
lc_date = [0, 0, 0, 0, days_since_creation]
for i in range(4, 0, -1):
if lc_date[i] >= caps[i]:
lc_date[i-1] += int(lc_date[i]/caps[i])
lc_date[i] %= caps[i]
elif lc_date[i] < 0:
lc_date[i-1] += int(lc_date[i]/caps[i])
lc_date[i] = 0
return '.'.join(str(i) for i in lc_date)

# Properties
# ----------
@property
@@ -30,6 +30,21 @@ def test_iso8601(string, expected):
assert r == d.iso8601()


@pytest.mark.parametrize(
"string,expected",
[
('January 1, 1970', "12.17.16.7.5"),
('December 21, 2012', "13.0.0.0.0"),
('March 4, 1900', "12.14.5.10.0"),
],
)
def test_long_count(string, expected):
r = maya.parse(string).long_count()
d = maya.MayaDT.from_long_count(r)
assert r == expected
assert r == d.long_count()


@pytest.mark.parametrize(
"string,expected",
[

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