def make_rate_helper(market, quote, reference_date=None):
"""
Wrapper for deposit and swaps rate helpers makers
TODO: class method of RateHelper?
"""
rate_type, tenor, quote_value = quote
if rate_type == 'SWAP':
libor_index = market._floating_rate_index
spread = SimpleQuote(0)
fwdStart = Period(0, Days)
helper = SwapRateHelper.from_tenor(
quote_value, Period(tenor),
market._floating_rate_index.fixing_calendar,
Period(market._params.fixed_leg_period).frequency,
BusinessDayConvention.from_name(
market._params.fixed_leg_convention),
DayCounter.from_name(market._params.fixed_leg_daycount),
libor_index, spread, fwdStart)
elif rate_type == 'DEP':
end_of_month = True
helper = DepositRateHelper(
quote_value, Period(tenor), market._params.settlement_days,
market._floating_rate_index.fixing_calendar,
market._floating_rate_index.business_day_convention, end_of_month,
DayCounter.from_name(market._deposit_daycount))
elif rate_type == 'ED':
if reference_date is None:
raise Exception("Reference date needed with ED Futures data")
forward_date = next_imm_date(reference_date, tenor)
helper = FuturesRateHelper(
price=SimpleQuote(quote_value),
imm_date=qldate_from_pydate(forward_date),
length_in_months=3,
calendar=market._floating_rate_index.fixing_calendar,
convention=market._floating_rate_index.business_day_convention,
end_of_month=True,
day_counter=DayCounter.from_name(
market._params.floating_leg_daycount))
elif rate_type.startswith('ER'):
# TODO For Euribor futures, we found it useful to supply the `imm_date`
# parameter directly, instead of as a number of periods from the
# evaluation date, as for ED futures. To achieve this, we pass the
# `imm_date` in the `tenor` field of the quote.
helper = FuturesRateHelper(
price=SimpleQuote(quote_value),
imm_date=tenor,
length_in_months=3,
calendar=market._floating_rate_index.fixing_calendar,
convention=market._floating_rate_index.business_day_convention,
end_of_month=True,
day_counter=DayCounter.from_name(
market._params.floating_leg_daycount))
else:
raise Exception("Rate type %s not supported" % rate_type)
return helper
def next_imm_date(reference_date, tenor):
"""
Third Wednesday of contract month
"""
dt = qldate_from_pydate(reference_date)
for k in range(tenor):
tmp = imm.next_date(dt)
dt = pydate_to_qldate(tmp)
return pydate_from_qldate(dt)
def next_imm_date(reference_date, tenor):
"""
Third Wednesday of contract month
"""
dt = qldate_from_pydate(reference_date)
for k in range(tenor):
tmp = imm.next_date(dt)
dt = pydate_to_qldate(tmp)
return pydate_from_qldate(dt)
def make_rate_helper(market, quote, reference_date=None):
"""
Wrapper for deposit and swaps rate helpers makers
TODO: class method of RateHelper?
"""
rate_type, tenor, quote_value = quote
if rate_type == 'SWAP':
libor_index = market._floating_rate_index
spread = SimpleQuote(0)
fwdStart = Period(0, Days)
helper = SwapRateHelper.from_tenor(
quote_value,
Period(tenor),
market._floating_rate_index.fixing_calendar,
code_to_frequency(market._params.fixed_leg_period),
BusinessDayConvention.from_name(
market._params.fixed_leg_convention),
DayCounter.from_name(market._params.fixed_leg_daycount),
libor_index, spread, fwdStart)
elif rate_type == 'DEP':
end_of_month = True
helper = DepositRateHelper(
quote_value,
Period(tenor),
market._params.settlement_days,
market._floating_rate_index.fixing_calendar,
market._floating_rate_index.business_day_convention,
end_of_month,
DayCounter.from_name(market._deposit_daycount))
elif rate_type == 'ED':
if reference_date is None:
raise Exception("Reference date needed with ED Futures data")
forward_date = next_imm_date(reference_date, tenor)
helper = FuturesRateHelper(
rate =SimpleQuote(quote_value),
imm_date = qldate_from_pydate(forward_date),
length_in_months = 3,
calendar = market._floating_rate_index.fixing_calendar,
convention = market._floating_rate_index.business_day_convention,
end_of_month = True,
day_counter = DayCounter.from_name(
market._params.floating_leg_daycount))
elif rate_type.startswith('ER'):
# TODO For Euribor futures, we found it useful to supply the `imm_date`
# parameter directly, instead of as a number of periods from the
# evaluation date, as for ED futures. To achieve this, we pass the
# `imm_date` in the `tenor` field of the quote.
helper = FuturesRateHelper(
rate=SimpleQuote(quote_value),
imm_date=tenor,
length_in_months=3,
calendar=market._floating_rate_index.fixing_calendar,
convention=market._floating_rate_index.business_day_convention,
end_of_month=True,
day_counter=DayCounter.from_name(
market._params.floating_leg_daycount))
else:
raise Exception("Rate type %s not supported" % rate_type)
return helper
