123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103 |
- from decimal import Decimal
-
- from django.conf import settings
- from django.utils.safestring import mark_safe
-
-
- def format(
- number,
- decimal_sep,
- decimal_pos=None,
- grouping=0,
- thousand_sep="",
- force_grouping=False,
- use_l10n=None,
- ):
- """
- Get a number (as a number or string), and return it as a string,
- using formats defined as arguments:
-
- * decimal_sep: Decimal separator symbol (for example ".")
- * decimal_pos: Number of decimal positions
- * grouping: Number of digits in every group limited by thousand separator.
- For non-uniform digit grouping, it can be a sequence with the number
- of digit group sizes following the format used by the Python locale
- module in locale.localeconv() LC_NUMERIC grouping (e.g. (3, 2, 0)).
- * thousand_sep: Thousand separator symbol (for example ",")
- """
- use_grouping = (
- use_l10n or (use_l10n is None and settings.USE_L10N)
- ) and settings.USE_THOUSAND_SEPARATOR
- use_grouping = use_grouping or force_grouping
- use_grouping = use_grouping and grouping != 0
- # Make the common case fast
- if isinstance(number, int) and not use_grouping and not decimal_pos:
- return mark_safe(number)
- # sign
- sign = ""
- # Treat potentially very large/small floats as Decimals.
- if isinstance(number, float) and "e" in str(number).lower():
- number = Decimal(str(number))
- if isinstance(number, Decimal):
- if decimal_pos is not None:
- # If the provided number is too small to affect any of the visible
- # decimal places, consider it equal to '0'.
- cutoff = Decimal("0." + "1".rjust(decimal_pos, "0"))
- if abs(number) < cutoff:
- number = Decimal("0")
-
- # Format values with more than 200 digits (an arbitrary cutoff) using
- # scientific notation to avoid high memory usage in {:f}'.format().
- _, digits, exponent = number.as_tuple()
- if abs(exponent) + len(digits) > 200:
- number = "{:e}".format(number)
- coefficient, exponent = number.split("e")
- # Format the coefficient.
- coefficient = format(
- coefficient,
- decimal_sep,
- decimal_pos,
- grouping,
- thousand_sep,
- force_grouping,
- use_l10n,
- )
- return "{}e{}".format(coefficient, exponent)
- else:
- str_number = "{:f}".format(number)
- else:
- str_number = str(number)
- if str_number[0] == "-":
- sign = "-"
- str_number = str_number[1:]
- # decimal part
- if "." in str_number:
- int_part, dec_part = str_number.split(".")
- if decimal_pos is not None:
- dec_part = dec_part[:decimal_pos]
- else:
- int_part, dec_part = str_number, ""
- if decimal_pos is not None:
- dec_part = dec_part + ("0" * (decimal_pos - len(dec_part)))
- dec_part = dec_part and decimal_sep + dec_part
- # grouping
- if use_grouping:
- try:
- # if grouping is a sequence
- intervals = list(grouping)
- except TypeError:
- # grouping is a single value
- intervals = [grouping, 0]
- active_interval = intervals.pop(0)
- int_part_gd = ""
- cnt = 0
- for digit in int_part[::-1]:
- if cnt and cnt == active_interval:
- if intervals:
- active_interval = intervals.pop(0) or active_interval
- int_part_gd += thousand_sep[::-1]
- cnt = 0
- int_part_gd += digit
- cnt += 1
- int_part = int_part_gd[::-1]
- return sign + int_part + dec_part
|