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REF: inline get_day_of_month #34772

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Merged
merged 1 commit into from
Jun 14, 2020
Merged

REF: inline get_day_of_month #34772

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53 changes: 29 additions & 24 deletions pandas/_libs/tslibs/offsets.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -3757,16 +3757,22 @@ cdef shift_quarters(
n = quarters

months_since = (dts.month - q1start_month) % modby
compare_day = get_day_of_month(&dts, day_opt)

# offset semantics - if on the anchor point and going backwards
# shift to next
if n <= 0 and (months_since != 0 or
(months_since == 0 and dts.day > 1)):
(months_since == 0 and dts.day > compare_day)):
# make sure to roll forward, so negate
n += 1
elif n > 0 and (months_since == 0 and dts.day < compare_day):
# pretend to roll back if on same month but
# before compare_day
n -= 1

dts.year = year_add_months(dts, modby * n - months_since)
dts.month = month_add_months(dts, modby * n - months_since)
dts.day = 1
dts.day = get_day_of_month(&dts, day_opt)

out[i] = dtstruct_to_dt64(&dts)

Expand All @@ -3781,21 +3787,20 @@ cdef shift_quarters(
n = quarters

months_since = (dts.month - q1start_month) % modby
compare_day = get_day_of_month(&dts, day_opt)

if n <= 0 and months_since != 0:
# The general case of this condition would be
# `months_since != 0 or (months_since == 0 and
# dts.day > get_days_in_month(dts.year, dts.month))`
# but the get_days_in_month inequality would never hold.
if n <= 0 and (months_since != 0 or
(months_since == 0 and dts.day > compare_day)):
# make sure to roll forward, so negate
n += 1
elif n > 0 and (months_since == 0 and
dts.day < get_days_in_month(dts.year,
dts.month)):
elif n > 0 and (months_since == 0 and dts.day < compare_day):
# pretend to roll back if on same month but
# before compare_day
n -= 1

dts.year = year_add_months(dts, modby * n - months_since)
dts.month = month_add_months(dts, modby * n - months_since)
dts.day = get_days_in_month(dts.year, dts.month)
dts.day = get_day_of_month(&dts, day_opt)

out[i] = dtstruct_to_dt64(&dts)

Expand All @@ -3812,7 +3817,7 @@ cdef shift_quarters(
months_since = (dts.month - q1start_month) % modby
# compare_day is only relevant for comparison in the case
# where months_since == 0.
compare_day = get_firstbday(dts.year, dts.month)
compare_day = get_day_of_month(&dts, day_opt)

if n <= 0 and (months_since != 0 or
(months_since == 0 and dts.day > compare_day)):
Expand All @@ -3826,7 +3831,7 @@ cdef shift_quarters(
dts.year = year_add_months(dts, modby * n - months_since)
dts.month = month_add_months(dts, modby * n - months_since)

dts.day = get_firstbday(dts.year, dts.month)
dts.day = get_day_of_month(&dts, day_opt)

out[i] = dtstruct_to_dt64(&dts)

Expand All @@ -3843,7 +3848,7 @@ cdef shift_quarters(
months_since = (dts.month - q1start_month) % modby
# compare_day is only relevant for comparison in the case
# where months_since == 0.
compare_day = get_lastbday(dts.year, dts.month)
compare_day = get_day_of_month(&dts, day_opt)

if n <= 0 and (months_since != 0 or
(months_since == 0 and dts.day > compare_day)):
Expand All @@ -3857,7 +3862,7 @@ cdef shift_quarters(
dts.year = year_add_months(dts, modby * n - months_since)
dts.month = month_add_months(dts, modby * n - months_since)

dts.day = get_lastbday(dts.year, dts.month)
dts.day = get_day_of_month(&dts, day_opt)

out[i] = dtstruct_to_dt64(&dts)

Expand Down Expand Up @@ -3909,7 +3914,7 @@ def shift_months(const int64_t[:] dtindex, int months, object day_opt=None):

dt64_to_dtstruct(dtindex[i], &dts)
months_to_roll = months
compare_day = 1
compare_day = get_day_of_month(&dts, day_opt)

# offset semantics - if on the anchor point and going backwards
# shift to next
Expand All @@ -3918,7 +3923,7 @@ def shift_months(const int64_t[:] dtindex, int months, object day_opt=None):

dts.year = year_add_months(dts, months_to_roll)
dts.month = month_add_months(dts, months_to_roll)
dts.day = 1
dts.day = get_day_of_month(&dts, day_opt)

out[i] = dtstruct_to_dt64(&dts)
elif day_opt == "end":
Expand All @@ -3930,7 +3935,7 @@ def shift_months(const int64_t[:] dtindex, int months, object day_opt=None):

dt64_to_dtstruct(dtindex[i], &dts)
months_to_roll = months
compare_day = get_days_in_month(dts.year, dts.month)
compare_day = get_day_of_month(&dts, day_opt)

# similar semantics - when adding shift forward by one
# month if already at an end of month
Expand All @@ -3940,7 +3945,7 @@ def shift_months(const int64_t[:] dtindex, int months, object day_opt=None):
dts.year = year_add_months(dts, months_to_roll)
dts.month = month_add_months(dts, months_to_roll)

dts.day = get_days_in_month(dts.year, dts.month)
dts.day = get_day_of_month(&dts, day_opt)
out[i] = dtstruct_to_dt64(&dts)

elif day_opt == "business_start":
Expand All @@ -3952,15 +3957,15 @@ def shift_months(const int64_t[:] dtindex, int months, object day_opt=None):

dt64_to_dtstruct(dtindex[i], &dts)
months_to_roll = months
compare_day = get_firstbday(dts.year, dts.month)
compare_day = get_day_of_month(&dts, day_opt)

months_to_roll = roll_convention(dts.day, months_to_roll,
compare_day)

dts.year = year_add_months(dts, months_to_roll)
dts.month = month_add_months(dts, months_to_roll)

dts.day = get_firstbday(dts.year, dts.month)
dts.day = get_day_of_month(&dts, day_opt)
out[i] = dtstruct_to_dt64(&dts)

elif day_opt == "business_end":
Expand All @@ -3972,15 +3977,15 @@ def shift_months(const int64_t[:] dtindex, int months, object day_opt=None):

dt64_to_dtstruct(dtindex[i], &dts)
months_to_roll = months
compare_day = get_lastbday(dts.year, dts.month)
compare_day = get_day_of_month(&dts, day_opt)

months_to_roll = roll_convention(dts.day, months_to_roll,
compare_day)

dts.year = year_add_months(dts, months_to_roll)
dts.month = month_add_months(dts, months_to_roll)

dts.day = get_lastbday(dts.year, dts.month)
dts.day = get_day_of_month(&dts, day_opt)
out[i] = dtstruct_to_dt64(&dts)

else:
Expand Down Expand Up @@ -4051,7 +4056,7 @@ def shift_month(stamp: datetime, months: int,
return stamp.replace(year=year, month=month, day=day)


cdef int get_day_of_month(npy_datetimestruct* dts, day_opt) nogil except? -1:
cdef inline int get_day_of_month(npy_datetimestruct* dts, day_opt) nogil except? -1:
"""
Find the day in `other`'s month that satisfies a DateOffset's is_on_offset
policy, as described by the `day_opt` argument.
Expand Down