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REF: de-duplicate tslibs.fields #38950

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Jan 4, 2021
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REF: de-duplicate tslibs.fields #38950

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126 changes: 26 additions & 100 deletions pandas/_libs/tslibs/fields.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,18 @@ def get_date_name_field(const int64_t[:] dtindex, str field, object locale=None)
return out


cdef inline bint _is_on_month(int month, int compare_month, int modby) nogil:
"""
Analogous to DateOffset.is_on_offset checking for the month part of a date.
"""
if modby == 1:
return True
elif modby == 3:
return (month - compare_month) % 3 == 0
else:
return month == compare_month


@cython.wraparound(False)
@cython.boundscheck(False)
def get_start_end_field(const int64_t[:] dtindex, str field,
Expand All @@ -191,6 +203,7 @@ def get_start_end_field(const int64_t[:] dtindex, str field,
int start_month = 1
ndarray[int8_t] out
npy_datetimestruct dts
int compare_month, modby

out = np.zeros(count, dtype='int8')

Expand All @@ -215,102 +228,15 @@ def get_start_end_field(const int64_t[:] dtindex, str field,
end_month = 12
start_month = 1

if field == 'is_month_start':
if is_business:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if dts.day == get_firstbday(dts.year, dts.month):
out[i] = 1

else:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if dts.day == 1:
out[i] = 1

elif field == 'is_month_end':
if is_business:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if dts.day == get_lastbday(dts.year, dts.month):
out[i] = 1

else:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if dts.day == get_days_in_month(dts.year, dts.month):
out[i] = 1

elif field == 'is_quarter_start':
if is_business:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if ((dts.month - start_month) % 3 == 0) and (
dts.day == get_firstbday(dts.year, dts.month)):
out[i] = 1

else:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if ((dts.month - start_month) % 3 == 0) and dts.day == 1:
out[i] = 1

elif field == 'is_quarter_end':
if is_business:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if ((dts.month - end_month) % 3 == 0) and (
dts.day == get_lastbday(dts.year, dts.month)):
out[i] = 1

else:
for i in range(count):
if dtindex[i] == NPY_NAT:
out[i] = 0
continue

dt64_to_dtstruct(dtindex[i], &dts)

if ((dts.month - end_month) % 3 == 0) and (
dts.day == get_days_in_month(dts.year, dts.month)):
out[i] = 1
compare_month = start_month if "start" in field else end_month
if "month" in field:
modby = 1
elif "quarter" in field:
modby = 3
else:
modby = 12

elif field == 'is_year_start':
if field in ["is_month_start", "is_quarter_start", "is_year_start"]:
if is_business:
for i in range(count):
if dtindex[i] == NPY_NAT:
Expand All @@ -319,7 +245,7 @@ def get_start_end_field(const int64_t[:] dtindex, str field,

dt64_to_dtstruct(dtindex[i], &dts)

if (dts.month == start_month) and (
if _is_on_month(dts.month, compare_month, modby) and (
dts.day == get_firstbday(dts.year, dts.month)):
out[i] = 1

Expand All @@ -331,10 +257,10 @@ def get_start_end_field(const int64_t[:] dtindex, str field,

dt64_to_dtstruct(dtindex[i], &dts)

if (dts.month == start_month) and dts.day == 1:
if _is_on_month(dts.month, compare_month, modby) and dts.day == 1:
out[i] = 1

elif field == 'is_year_end':
elif field in ["is_month_end", "is_quarter_end", "is_year_end"]:
if is_business:
for i in range(count):
if dtindex[i] == NPY_NAT:
Expand All @@ -343,7 +269,7 @@ def get_start_end_field(const int64_t[:] dtindex, str field,

dt64_to_dtstruct(dtindex[i], &dts)

if (dts.month == end_month) and (
if _is_on_month(dts.month, compare_month, modby) and (
dts.day == get_lastbday(dts.year, dts.month)):
out[i] = 1

Expand All @@ -355,7 +281,7 @@ def get_start_end_field(const int64_t[:] dtindex, str field,

dt64_to_dtstruct(dtindex[i], &dts)

if (dts.month == end_month) and (
if _is_on_month(dts.month, compare_month, modby) and (
dts.day == get_days_in_month(dts.year, dts.month)):
out[i] = 1

Expand Down