NPO-Accounting/oxrlib Changeset - f7a57ded868c

Changeset - f7a57ded868c

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Brett Smith - 7 years ago 2017-07-06 14:17:08
brettcsmith@brettcsmith.org

historical: Add comments to explain the precision-finding code.

1 file changed with 5 insertions and 0 deletions:

oxrlib/commands/historical.py

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oxrlib/commands/historical.py

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@@ ... / @@ -109,10 +109,15 @@ class LedgerFormatter(Formatter): @@
         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))

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