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Location: NPO-Accounting/oxrlib/oxrlib/commands/historical.py - annotation
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tests: Historical tests use more flexible rate matching.
This lets the tests be more flexible about how much precision is used in
rates when appropriate, and makes them ready to parametrize for
Beancount.
This lets the tests be more flexible about how much precision is used in
rates when appropriate, and makes them ready to parametrize for
Beancount.
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import itertools
import operator
import babel.numbers
from .. import rate as oxrrate
try:
import enum
except ImportError:
import enum34 as enum
class Formatter:
def __init__(self, rate, signed_currencies=(), base_fmt='#,##0.###',
rate_precision=5, denomination=None):
self.rate = rate
self.base_fmt = base_fmt
self.base_fmt_noprec = base_fmt.rsplit('.', 1)[0]
self.signed_currencies = set(code for code in signed_currencies
if self.can_sign_currency(code))
self.rate_prec = rate_precision
self.denomination = denomination
def can_sign_currency(self, code):
return False
def format_currency(self, amount, code, currency_digits=True):
if currency_digits:
fmt = self.base_fmt
else:
fmt = '{}.{}'.format(self.base_fmt_noprec, '#' * -amount.as_tuple().exponent)
if code in self.signed_currencies:
fmt = '¤' + fmt
else:
fmt = fmt + ' ¤¤'
return babel.numbers.format_currency(amount, code, fmt, currency_digits=currency_digits)
def currency_decimal(self, amount, currency):
amt_s = babel.numbers.format_currency(amount, currency, '###0.###')
return decimal.Decimal(amt_s)
def normalize_rate(self, rate, prec=None):
return rate
def format_rate(self, rate):
return "{:g}".format(rate)
def format_rate_pair(self, from_curr, to_curr):
from_amt = 1
to_amt = self.rate.convert(from_amt, from_curr, to_curr)
return "{} {} = {} {}".format(
self.format_rate(from_amt), from_curr,
self.format_rate(to_amt), to_curr,
)
def format_rate_pair_bidir(self, from_curr, to_curr, sep='\n'):
return "{}{}{}".format(
self.format_rate_pair(from_curr, to_curr),
sep,
self.format_rate_pair(to_curr, from_curr),
)
def format_conversion(self, from_amt, from_curr, to_curr):
to_amt = self.rate.convert(from_amt, from_curr, to_curr)
return "{} = {}".format(
self.format_currency(from_amt, from_curr),
self.format_currency(to_amt, to_curr),
)
class LedgerFormatter(Formatter):
def can_sign_currency(self, code):
return len(babel.numbers.get_currency_symbol(code)) == 1
def normalize_rate(self, rate, prec=None):
if prec is None:
prec = self.rate_prec
_, digits, exponent = rate.normalize().as_tuple()
# Return ``prec`` nonzero digits of precision, if available.
prec -= min(0, exponent + len(digits))
quant_to = '1.{}'.format('0' * prec)
try:
qrate = rate.quantize(decimal.Decimal(quant_to))
except decimal.InvalidOperation:
# The original rate doesn't have that much precision, so use it raw.
qrate = rate
return qrate.normalize()
def format_rate(self, rate):
return str(self.normalize_rate(rate))
def format_ledger_rate_raw(self, rate, curr):
rate_s = self.format_currency(rate, curr, currency_digits=False)
return "{{={0}}} @ {0}".format(rate_s)
def format_ledger_rate(self, rate, curr):
return self.format_ledger_rate_raw(self.normalize_rate(rate), curr)
def format_rate_pair(self, from_curr, to_curr):
from_amt = 1
to_amt = self.rate.convert(from_amt, from_curr, to_curr)
return "{} {} {}".format(
from_amt, from_curr, self.format_ledger_rate(to_amt, to_curr))
def _denomination_for(self, currency, default):
if self.denomination is None:
return default
elif self.denomination == currency:
return None
else:
return self.denomination
def format_denominated_rate(self, amount, currency, default_denomination):
denomination = self._denomination_for(currency, default_denomination)
amt_s = self.format_currency(amount, currency)
if denomination is None:
return amt_s
full_rate = self.rate.convert(1, currency, denomination)
# Starting from self.rate_prec, find the least amount of precision to
# make sure the `from` amount converts exactly to the `to` amount.
to_amt = self.currency_decimal(amount * full_rate, denomination)
for prec in itertools.count(self.rate_prec):
rate = self.normalize_rate(full_rate, prec)
got_amt = self.currency_decimal(amount * rate, denomination)
# If got_amt == to_amt, this is enough precision to do the
# conversion exactly, so we're done.
# If rate == full_rate, there's no more precision available, so stop.
if (got_amt == to_amt) or (rate == full_rate):
break
return "{} {}".format(amt_s, self.format_ledger_rate_raw(rate, denomination))
def format_conversion(self, from_amt, from_curr, to_curr):
to_amt = self.rate.convert(from_amt, from_curr, to_curr)
return "{}\n{}".format(
self.format_denominated_rate(from_amt, from_curr, to_curr),
self.format_denominated_rate(to_amt, to_curr, None),
)
class Formats(enum.Enum):
RAW = Formatter
LEDGER = LedgerFormatter
@classmethod
def from_arg(cls, s):
return cls[s.upper()]
def run(config, stdout, stderr):
loaders = config.get_loaders()
with loaders.historical(config.args.date, config.args.base) as rate_json:
rate = oxrrate.Rate.from_json_file(rate_json)
if loaders.should_cache():
config.cache.save_rate(rate)
formatter = config.args.output_format.value(
rate,
config.args.signed_currencies,
denomination=config.args.denomination,
)
if not config.args.from_currency:
for from_curr in sorted(rate.rates):
print(formatter.format_rate_pair_bidir(from_curr, config.args.to_currency),
file=stdout)
elif config.args.amount is None:
print(formatter.format_rate_pair_bidir(config.args.from_currency, config.args.to_currency),
file=stdout)
else:
print(formatter.format_conversion(config.args.amount,
config.args.from_currency,
config.args.to_currency),
file=stdout)
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