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