/usr/lib/python2.7/dist-packages/zope/i18n/format.py is in python-zope.i18n 4.1.0-1.
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#
# Copyright (c) 2002, 2003 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Basic Object Formatting
This module implements basic object formatting functionality, such as
date/time, number and money formatting.
"""
import sys
import re
import math
import datetime
import pytz
import pytz.reference
from zope.i18n.interfaces import IDateTimeFormat, INumberFormat
from zope.interface import implementer
from ._compat import _u
PY3 = sys.version_info[0] == 3
if PY3:
unicode = str
def roundHalfUp(n):
"""Works like round() in python2.x
Implementation of round() was changed in python3 - it rounds halfs to
nearest even number, so that round(0.5) == 0. This function is here to
unify behaviour between python 2.x and 3.x for the purposes of this module.
"""
return math.floor(n + math.copysign(0.5, n))
def _findFormattingCharacterInPattern(char, pattern):
return [entry for entry in pattern
if isinstance(entry, tuple) and entry[0] == char]
class DateTimeParseError(Exception):
"""Error is raised when parsing of datetime failed."""
@implementer(IDateTimeFormat)
class DateTimeFormat(object):
__doc__ = IDateTimeFormat.__doc__
_DATETIMECHARS = "aGyMdEDFwWhHmsSkKz"
def __init__(self, pattern=None, calendar=None):
if calendar is not None:
self.calendar = calendar
self._pattern = pattern
self._bin_pattern = None
if self._pattern is not None:
self._bin_pattern = parseDateTimePattern(self._pattern,
self._DATETIMECHARS)
def setPattern(self, pattern):
"See zope.i18n.interfaces.IFormat"
self._pattern = pattern
self._bin_pattern = parseDateTimePattern(self._pattern,
self._DATETIMECHARS)
def getPattern(self):
"See zope.i18n.interfaces.IFormat"
return self._pattern
def parse(self, text, pattern=None, asObject=True):
"See zope.i18n.interfaces.IFormat"
# Make or get binary form of datetime pattern
if pattern is not None:
bin_pattern = parseDateTimePattern(pattern)
else:
bin_pattern = self._bin_pattern
pattern = self._pattern
# Generate the correct regular expression to parse the date and parse.
regex = '^'
info = buildDateTimeParseInfo(self.calendar, bin_pattern)
for elem in bin_pattern:
regex += info.get(elem, elem)
regex += '$'
try:
results = re.match(regex, text).groups()
except AttributeError:
raise DateTimeParseError(
'The datetime string did not match the pattern %r.'
% pattern)
# Sometimes you only want the parse results
if not asObject:
return results
# Map the parsing results to a datetime object
ordered = [None, None, None, None, None, None, None]
bin_pattern = list(filter(lambda x: isinstance(x, tuple), bin_pattern))
# Handle years; note that only 'yy' and 'yyyy' are allowed
if ('y', 2) in bin_pattern:
year = int(results[bin_pattern.index(('y', 2))])
if year > 30:
ordered[0] = 1900 + year
else:
ordered[0] = 2000 + year
if ('y', 4) in bin_pattern:
ordered[0] = int(results[bin_pattern.index(('y', 4))])
# Handle months (text)
month_entry = _findFormattingCharacterInPattern('M', bin_pattern)
if month_entry and month_entry[0][1] == 3:
abbr = results[bin_pattern.index(month_entry[0])]
ordered[1] = self.calendar.getMonthTypeFromAbbreviation(abbr)
elif month_entry and month_entry[0][1] >= 4:
name = results[bin_pattern.index(month_entry[0])]
ordered[1] = self.calendar.getMonthTypeFromName(name)
elif month_entry and month_entry[0][1] <= 2:
ordered[1] = int(results[bin_pattern.index(month_entry[0])])
# Handle hours with AM/PM
hour_entry = _findFormattingCharacterInPattern('h', bin_pattern)
if hour_entry:
hour = int(results[bin_pattern.index(hour_entry[0])])
ampm_entry = _findFormattingCharacterInPattern('a', bin_pattern)
if not ampm_entry:
raise DateTimeParseError(
'Cannot handle 12-hour format without am/pm marker.')
ampm = self.calendar.pm == results[bin_pattern.index(ampm_entry[0])]
if hour == 12:
ampm = not ampm
ordered[3] = (hour + 12*ampm)%24
# Shortcut for the simple int functions
dt_fields_map = {'d': 2, 'H': 3, 'm': 4, 's': 5, 'S': 6}
for field in dt_fields_map.keys():
entry = _findFormattingCharacterInPattern(field, bin_pattern)
if not entry: continue
pos = dt_fields_map[field]
ordered[pos] = int(results[bin_pattern.index(entry[0])])
# Handle timezones
tzinfo = None
pytz_tzinfo = False # If True, we should use pytz specific syntax
tz_entry = _findFormattingCharacterInPattern('z', bin_pattern)
if ordered[3:] != [None, None, None, None] and tz_entry:
length = tz_entry[0][1]
value = results[bin_pattern.index(tz_entry[0])]
if length == 1:
hours, mins = int(value[:-2]), int(value[-2:])
tzinfo = pytz.FixedOffset(hours * 60 + mins)
elif length == 2:
hours, mins = int(value[:-3]), int(value[-2:])
tzinfo = pytz.FixedOffset(hours * 60 + mins)
else:
try:
tzinfo = pytz.timezone(value)
pytz_tzinfo = True
except KeyError:
# TODO: Find timezones using locale information
pass
# Create a date/time object from the data
# If we have a pytz tzinfo, we need to invoke localize() as per
# the pytz documentation on creating local times.
# NB. If we are in an end-of-DST transition period, we have a 50%
# chance of getting a time 1 hour out here, but that is the price
# paid for dealing with localtimes.
if ordered[3:] == [None, None, None, None]:
return datetime.date(*[e or 0 for e in ordered[:3]])
elif ordered[:3] == [None, None, None]:
if pytz_tzinfo:
return tzinfo.localize(
datetime.time(*[e or 0 for e in ordered[3:]])
)
else:
return datetime.time(
*[e or 0 for e in ordered[3:]], **{'tzinfo' :tzinfo}
)
else:
if pytz_tzinfo:
return tzinfo.localize(datetime.datetime(
*[e or 0 for e in ordered]
))
else:
return datetime.datetime(
*[e or 0 for e in ordered], **{'tzinfo' :tzinfo}
)
def format(self, obj, pattern=None):
"See zope.i18n.interfaces.IFormat"
# Make or get binary form of datetime pattern
if pattern is not None:
bin_pattern = parseDateTimePattern(pattern)
else:
bin_pattern = self._bin_pattern
text = _u("")
info = buildDateTimeInfo(obj, self.calendar, bin_pattern)
for elem in bin_pattern:
text += info.get(elem, elem)
return text
class NumberParseError(Exception):
"""Error that can be raised when smething unexpected happens during the
number parsing process."""
@implementer(INumberFormat)
class NumberFormat(object):
__doc__ = INumberFormat.__doc__
type = None
def __init__(self, pattern=None, symbols={}):
# setup default symbols
self.symbols = {
_u("decimal"): _u("."),
_u("group"): _u(","),
_u("list"): _u(";"),
_u("percentSign"): _u("%"),
_u("nativeZeroDigit"): _u("0"),
_u("patternDigit"): _u("#"),
_u("plusSign"): _u("+"),
_u("minusSign"): _u("-"),
_u("exponential"): _u("E"),
_u("perMille"): _u("\xe2\x88\x9e"),
_u("infinity"): _u("\xef\xbf\xbd"),
_u("nan"): '' }
self.symbols.update(symbols)
self._pattern = pattern
self._bin_pattern = None
if self._pattern is not None:
self._bin_pattern = parseNumberPattern(self._pattern)
def setPattern(self, pattern):
"See zope.i18n.interfaces.IFormat"
self._pattern = pattern
self._bin_pattern = parseNumberPattern(self._pattern)
def getPattern(self):
"See zope.i18n.interfaces.IFormat"
return self._pattern
def parse(self, text, pattern=None):
"See zope.i18n.interfaces.IFormat"
# Make or get binary form of datetime pattern
if pattern is not None:
bin_pattern = parseNumberPattern(pattern)
else:
bin_pattern = self._bin_pattern
pattern = self._pattern
# Determine sign
num_res = [None, None]
for sign in (0, 1):
regex = '^'
if bin_pattern[sign][PADDING1] is not None:
regex += '[' + bin_pattern[sign][PADDING1] + ']+'
if bin_pattern[sign][PREFIX] != '':
regex += '[' + bin_pattern[sign][PREFIX] + ']'
if bin_pattern[sign][PADDING2] is not None:
regex += '[' + bin_pattern[sign][PADDING2] + ']+'
regex += '([0-9'
min_size = bin_pattern[sign][INTEGER].count('0')
if bin_pattern[sign][GROUPING]:
regex += self.symbols['group']
min_size += min_size/3
regex += ']{%i,100}' %(min_size)
if bin_pattern[sign][FRACTION]:
max_precision = len(bin_pattern[sign][FRACTION])
min_precision = bin_pattern[sign][FRACTION].count('0')
regex += '['+self.symbols['decimal']+']?'
regex += '[0-9]{%i,%i}' %(min_precision, max_precision)
if bin_pattern[sign][EXPONENTIAL] != '':
regex += self.symbols['exponential']
min_exp_size = bin_pattern[sign][EXPONENTIAL].count('0')
pre_symbols = self.symbols['minusSign']
if bin_pattern[sign][EXPONENTIAL][0] == '+':
pre_symbols += self.symbols['plusSign']
regex += '[%s]?[0-9]{%i,100}' %(pre_symbols, min_exp_size)
regex +=')'
if bin_pattern[sign][PADDING3] is not None:
regex += '[' + bin_pattern[sign][PADDING3] + ']+'
if bin_pattern[sign][SUFFIX] != '':
regex += '[' + bin_pattern[sign][SUFFIX] + ']'
if bin_pattern[sign][PADDING4] is not None:
regex += '[' + bin_pattern[sign][PADDING4] + ']+'
regex += '$'
num_res[sign] = re.match(regex, text)
if num_res[0] is not None:
num_str = num_res[0].groups()[0]
sign = +1
elif num_res[1] is not None:
num_str = num_res[1].groups()[0]
sign = -1
else:
raise NumberParseError('Not a valid number for this pattern %r.'
% pattern)
# Remove possible grouping separators
num_str = num_str.replace(self.symbols['group'], '')
# Extract number
type = int
if self.symbols['decimal'] in num_str:
type = float
num_str = num_str.replace(self.symbols['decimal'], '.')
if self.symbols['exponential'] in num_str:
type = float
num_str = num_str.replace(self.symbols['exponential'], 'E')
if self.type:
type = self.type
return sign*type(num_str)
def _format_integer(self, integer, pattern):
size = len(integer)
min_size = pattern.count('0')
if size < min_size:
integer = self.symbols['nativeZeroDigit']*(min_size-size) + integer
return integer
def _format_fraction(self, fraction, pattern):
max_precision = len(pattern)
min_precision = pattern.count('0')
precision = len(fraction)
roundInt = False
if precision > max_precision:
round = int(fraction[max_precision]) >= 5
fraction = fraction[:max_precision]
if round:
if fraction != '':
# add 1 to the fraction, maintaining the decimal
# precision; if the result >= 1, need to roundInt
fractionLen = len(fraction)
rounded = int(fraction) + 1
fraction = ('%0' + str(fractionLen) + 'i') % rounded
if len(fraction) > fractionLen: # rounded fraction >= 1
roundInt = True
fraction = fraction[1:]
else:
# fraction missing, e.g. 1.5 -> 1. -- need to roundInt
roundInt = True
if precision < min_precision:
fraction += self.symbols['nativeZeroDigit']*(min_precision -
precision)
if fraction != '':
fraction = self.symbols['decimal'] + fraction
return fraction, roundInt
def format(self, obj, pattern=None):
"See zope.i18n.interfaces.IFormat"
# Make or get binary form of datetime pattern
if pattern is not None:
bin_pattern = parseNumberPattern(pattern)
else:
bin_pattern = self._bin_pattern
# Get positive or negative sub-pattern
if obj >= 0:
bin_pattern = bin_pattern[0]
else:
bin_pattern = bin_pattern[1]
if bin_pattern[EXPONENTIAL] != '':
obj_int_frac = str(obj).split('.')
# The exponential might have a mandatory sign; remove it from the
# bin_pattern and remember the setting
exp_bin_pattern = bin_pattern[EXPONENTIAL]
plus_sign = _u("")
if exp_bin_pattern.startswith('+'):
plus_sign = self.symbols['plusSign']
exp_bin_pattern = exp_bin_pattern[1:]
# We have to remove the possible '-' sign
if obj < 0:
obj_int_frac[0] = obj_int_frac[0][1:]
if obj_int_frac[0] == '0':
# abs() of number smaller 1
if len(obj_int_frac) > 1:
res = re.match('(0*)[0-9]*', obj_int_frac[1]).groups()[0]
exponent = self._format_integer(str(len(res)+1),
exp_bin_pattern)
exponent = self.symbols['minusSign']+exponent
number = obj_int_frac[1][len(res):]
else:
# We have exactly 0
exponent = self._format_integer('0', exp_bin_pattern)
number = self.symbols['nativeZeroDigit']
else:
exponent = self._format_integer(str(len(obj_int_frac[0])-1),
exp_bin_pattern)
number = ''.join(obj_int_frac)
fraction, roundInt = self._format_fraction(number[1:],
bin_pattern[FRACTION])
if roundInt:
number = str(int(number[0]) + 1) + fraction
else:
number = number[0] + fraction
# We might have a plus sign in front of the exponential integer
if not exponent.startswith('-'):
exponent = plus_sign + exponent
pre_padding = len(bin_pattern[FRACTION]) - len(number) + 2
post_padding = len(exp_bin_pattern) - len(exponent)
number += self.symbols['exponential'] + exponent
else:
obj_int_frac = str(obj).split('.')
if len(obj_int_frac) > 1:
fraction, roundInt = self._format_fraction(obj_int_frac[1],
bin_pattern[FRACTION])
else:
fraction = ''
roundInt = False
if roundInt:
obj = roundHalfUp(obj)
integer = self._format_integer(str(int(math.fabs(obj))),
bin_pattern[INTEGER])
# Adding grouping
if bin_pattern[GROUPING] == 1:
help = ''
for pos in range(1, len(integer)+1):
if (pos-1)%3 == 0 and pos != 1:
help = self.symbols['group'] + help
help = integer[-pos] + help
integer = help
pre_padding = len(bin_pattern[INTEGER]) - len(integer)
post_padding = len(bin_pattern[FRACTION]) - len(fraction)+1
number = integer + fraction
# Put it all together
text = ''
if bin_pattern[PADDING1] is not None and pre_padding > 0:
text += bin_pattern[PADDING1]*pre_padding
text += bin_pattern[PREFIX]
if bin_pattern[PADDING2] is not None and pre_padding > 0:
if bin_pattern[PADDING1] is not None:
text += bin_pattern[PADDING2]
else:
text += bin_pattern[PADDING2]*pre_padding
text += number
if bin_pattern[PADDING3] is not None and post_padding > 0:
if bin_pattern[PADDING4] is not None:
text += bin_pattern[PADDING3]
else:
text += bin_pattern[PADDING3]*post_padding
text += bin_pattern[SUFFIX]
if bin_pattern[PADDING4] is not None and post_padding > 0:
text += bin_pattern[PADDING4]*post_padding
# TODO: Need to make sure unicode is everywhere
return unicode(text)
DEFAULT = 0
IN_QUOTE = 1
IN_DATETIMEFIELD = 2
class DateTimePatternParseError(Exception):
"""DateTime Pattern Parse Error"""
def parseDateTimePattern(pattern, DATETIMECHARS="aGyMdEDFwWhHmsSkKz"):
"""This method can handle everything: time, date and datetime strings."""
result = []
state = DEFAULT
helper = ''
char = ''
quote_start = -2
for pos in range(len(pattern)):
prev_char = char
char = pattern[pos]
# Handle quotations
if char == "'":
if state == DEFAULT:
quote_start = pos
state = IN_QUOTE
elif state == IN_QUOTE and prev_char == "'":
helper += char
state = DEFAULT
elif state == IN_QUOTE:
# Do not care about putting the content of the quote in the
# result. The next state is responsible for that.
quote_start = -1
state = DEFAULT
elif state == IN_DATETIMEFIELD:
result.append((helper[0], len(helper)))
helper = ''
quote_start = pos
state = IN_QUOTE
elif state == IN_QUOTE:
helper += char
# Handle regular characters
elif char not in DATETIMECHARS:
if state == IN_DATETIMEFIELD:
result.append((helper[0], len(helper)))
helper = char
state = DEFAULT
elif state == DEFAULT:
helper += char
# Handle special formatting characters
elif char in DATETIMECHARS:
if state == DEFAULT:
# Clean up helper first
if helper:
result.append(helper)
helper = char
state = IN_DATETIMEFIELD
elif state == IN_DATETIMEFIELD and prev_char == char:
helper += char
elif state == IN_DATETIMEFIELD and prev_char != char:
result.append((helper[0], len(helper)))
helper = char
# Some cleaning up
if state == IN_QUOTE:
if quote_start == -1:
raise DateTimePatternParseError(
'Waaa: state = IN_QUOTE and quote_start = -1!')
else:
raise DateTimePatternParseError(
'The quote starting at character %i is not closed.' %
quote_start)
elif state == IN_DATETIMEFIELD:
result.append((helper[0], len(helper)))
elif state == DEFAULT:
result.append(helper)
return result
def buildDateTimeParseInfo(calendar, pattern):
"""This method returns a dictionary that helps us with the parsing.
It also depends on the locale of course."""
info = {}
# Generic Numbers
for field in 'dDFkKhHmsSwW':
for entry in _findFormattingCharacterInPattern(field, pattern):
# The maximum amount of digits should be infinity, but 1000 is
# close enough here.
info[entry] = r'([0-9]{%i,1000})' %entry[1]
# year (Number)
for entry in _findFormattingCharacterInPattern('y', pattern):
if entry[1] == 2:
info[entry] = r'([0-9]{2})'
elif entry[1] == 4:
info[entry] = r'([0-9]{4})'
else:
raise DateTimePatternParseError("Only 'yy' and 'yyyy' allowed." )
# am/pm marker (Text)
for entry in _findFormattingCharacterInPattern('a', pattern):
info[entry] = r'(%s|%s)' %(calendar.am, calendar.pm)
# era designator (Text)
# TODO: works for gregorian only right now
for entry in _findFormattingCharacterInPattern('G', pattern):
info[entry] = r'(%s|%s)' %(calendar.eras[1][1], calendar.eras[2][1])
# time zone (Text)
for entry in _findFormattingCharacterInPattern('z', pattern):
if entry[1] == 1:
info[entry] = r'([\+-][0-9]{3,4})'
elif entry[1] == 2:
info[entry] = r'([\+-][0-9]{2}:[0-9]{2})'
elif entry[1] == 3:
info[entry] = r'([a-zA-Z]{3})'
else:
info[entry] = r'([a-zA-Z /\.]*)'
# month in year (Text and Number)
for entry in _findFormattingCharacterInPattern('M', pattern):
if entry[1] == 1:
info[entry] = r'([0-9]{1,2})'
elif entry[1] == 2:
info[entry] = r'([0-9]{2})'
elif entry[1] == 3:
info[entry] = r'('+'|'.join(calendar.getMonthAbbreviations())+')'
else:
info[entry] = r'('+'|'.join(calendar.getMonthNames())+')'
# day in week (Text and Number)
for entry in _findFormattingCharacterInPattern('E', pattern):
if entry[1] == 1:
info[entry] = r'([0-9])'
elif entry[1] == 2:
info[entry] = r'([0-9]{2})'
elif entry[1] == 3:
info[entry] = r'('+'|'.join(calendar.getDayAbbreviations())+')'
else:
info[entry] = r'('+'|'.join(calendar.getDayNames())+')'
return info
def buildDateTimeInfo(dt, calendar, pattern):
"""Create the bits and pieces of the datetime object that can be put
together."""
if isinstance(dt, datetime.time):
dt = datetime.datetime(1969, 1, 1, dt.hour, dt.minute, dt.second,
dt.microsecond)
elif (isinstance(dt, datetime.date) and
not isinstance(dt, datetime.datetime)):
dt = datetime.datetime(dt.year, dt.month, dt.day)
if dt.hour >= 12:
ampm = calendar.pm
else:
ampm = calendar.am
h = dt.hour%12
if h == 0:
h = 12
weekday = (dt.weekday() + (8 - calendar.week['firstDay'])) % 7 + 1
day_of_week_in_month = (dt.day - 1) / 7 + 1
week_in_month = (dt.day + 6 - dt.weekday()) / 7 + 1
# Getting the timezone right
tzinfo = dt.tzinfo or pytz.utc
tz_secs = tzinfo.utcoffset(dt).seconds
tz_secs = (tz_secs > 12*3600) and tz_secs-24*3600 or tz_secs
tz_mins = int(math.fabs(tz_secs % 3600 / 60))
tz_hours = int(math.fabs(tz_secs / 3600))
tz_sign = (tz_secs < 0) and '-' or '+'
tz_defaultname = "%s%i%.2i" %(tz_sign, tz_hours, tz_mins)
tz_name = tzinfo.tzname(dt) or tz_defaultname
tz_fullname = getattr(tzinfo, 'zone', None) or tz_name
info = {('y', 2): unicode(dt.year)[2:],
('y', 4): unicode(dt.year),
}
# Generic Numbers
for field, value in (('d', dt.day), ('D', int(dt.strftime('%j'))),
('F', day_of_week_in_month), ('k', dt.hour or 24),
('K', dt.hour%12), ('h', h), ('H', dt.hour),
('m', dt.minute), ('s', dt.second),
('S', dt.microsecond), ('w', int(dt.strftime('%W'))),
('W', week_in_month)):
for entry in _findFormattingCharacterInPattern(field, pattern):
info[entry] = (_u("%%.%ii") %entry[1]) %value
# am/pm marker (Text)
for entry in _findFormattingCharacterInPattern('a', pattern):
info[entry] = ampm
# era designator (Text)
# TODO: works for gregorian only right now
for entry in _findFormattingCharacterInPattern('G', pattern):
info[entry] = calendar.eras[2][1]
# time zone (Text)
for entry in _findFormattingCharacterInPattern('z', pattern):
if entry[1] == 1:
info[entry] = _u("%s%i%.2i") %(tz_sign, tz_hours, tz_mins)
elif entry[1] == 2:
info[entry] = _u("%s%.2i:%.2i") %(tz_sign, tz_hours, tz_mins)
elif entry[1] == 3:
info[entry] = tz_name
else:
info[entry] = tz_fullname
# month in year (Text and Number)
for entry in _findFormattingCharacterInPattern('M', pattern):
if entry[1] == 1:
info[entry] = _u("%i") %dt.month
elif entry[1] == 2:
info[entry] = _u("%.2i") %dt.month
elif entry[1] == 3:
info[entry] = calendar.months[dt.month][1]
else:
info[entry] = calendar.months[dt.month][0]
# day in week (Text and Number)
for entry in _findFormattingCharacterInPattern('E', pattern):
if entry[1] == 1:
info[entry] = _u("%i") %weekday
elif entry[1] == 2:
info[entry] = _u("%.2i") %weekday
elif entry[1] == 3:
info[entry] = calendar.days[dt.weekday() + 1][1]
else:
info[entry] = calendar.days[dt.weekday() + 1][0]
return info
# Number Pattern Parser States
BEGIN = 0
READ_PADDING_1 = 1
READ_PREFIX = 2
READ_PREFIX_STRING = 3
READ_PADDING_2 = 4
READ_INTEGER = 5
READ_FRACTION = 6
READ_EXPONENTIAL = 7
READ_PADDING_3 = 8
READ_SUFFIX = 9
READ_SUFFIX_STRING = 10
READ_PADDING_4 = 11
READ_NEG_SUBPATTERN = 12
# Binary Pattern Locators
PADDING1 = 0
PREFIX = 1
PADDING2 = 2
INTEGER = 3
FRACTION = 4
EXPONENTIAL = 5
PADDING3 = 6
SUFFIX = 7
PADDING4 = 8
GROUPING = 9
class NumberPatternParseError(Exception):
"""Number Pattern Parse Error"""
def parseNumberPattern(pattern):
"""Parses all sorts of number pattern."""
prefix = ''
padding_1 = None
padding_2 = None
padding_3 = None
padding_4 = None
integer = ''
fraction = ''
exponential = ''
suffix = ''
grouping = 0
neg_pattern = None
SPECIALCHARS = "*.,#0;E'"
length = len(pattern)
state = BEGIN
helper = ''
for pos in range(length):
char = pattern[pos]
if state == BEGIN:
if char == '*':
state = READ_PADDING_1
elif char not in SPECIALCHARS:
state = READ_PREFIX
prefix += char
elif char == "'":
state = READ_PREFIX_STRING
elif char in '#0':
state = READ_INTEGER
helper += char
else:
raise NumberPatternParseError(
'Wrong syntax at beginning of pattern.')
elif state == READ_PADDING_1:
padding_1 = char
state = READ_PREFIX
elif state == READ_PREFIX:
if char == "*":
state = READ_PADDING_2
elif char == "'":
state = READ_PREFIX_STRING
elif char == "#" or char == "0":
state = READ_INTEGER
helper += char
else:
prefix += char
elif state == READ_PREFIX_STRING:
if char == "'":
state = READ_PREFIX
else:
prefix += char
elif state == READ_PADDING_2:
padding_2 = char
state = READ_INTEGER
elif state == READ_INTEGER:
if char == "#" or char == "0":
helper += char
elif char == ",":
grouping = 1
elif char == ".":
integer = helper
helper = ''
state = READ_FRACTION
elif char == "E":
integer = helper
helper = ''
state = READ_EXPONENTIAL
elif char == "*":
integer = helper
helper = ''
state = READ_PADDING_3
elif char == ";":
integer = helper
state = READ_NEG_SUBPATTERN
elif char == "'":
integer = helper
state = READ_SUFFIX_STRING
else:
integer = helper
suffix += char
state = READ_SUFFIX
elif state == READ_FRACTION:
if char == "#" or char == "0":
helper += char
elif char == "E":
fraction = helper
helper = ''
state = READ_EXPONENTIAL
elif char == "*":
fraction = helper
helper = ''
state = READ_PADDING_3
elif char == ";":
fraction = helper
state = READ_NEG_SUBPATTERN
elif char == "'":
fraction = helper
state = READ_SUFFIX_STRING
else:
fraction = helper
suffix += char
state = READ_SUFFIX
elif state == READ_EXPONENTIAL:
if char in ('0', '#', '+'):
helper += char
elif char == "*":
exponential = helper
helper = ''
state = READ_PADDING_3
elif char == ";":
exponential = helper
state = READ_NEG_SUBPATTERN
elif char == "'":
exponential = helper
state = READ_SUFFIX_STRING
else:
exponential = helper
suffix += char
state = READ_SUFFIX
elif state == READ_PADDING_3:
padding_3 = char
state = READ_SUFFIX
elif state == READ_SUFFIX:
if char == "*":
state = READ_PADDING_4
elif char == "'":
state = READ_SUFFIX_STRING
elif char == ";":
state = READ_NEG_SUBPATTERN
else:
suffix += char
elif state == READ_SUFFIX_STRING:
if char == "'":
state = READ_SUFFIX
else:
suffix += char
elif state == READ_PADDING_4:
if char == ';':
state = READ_NEG_SUBPATTERN
else:
padding_4 = char
elif state == READ_NEG_SUBPATTERN:
neg_pattern = parseNumberPattern(pattern[pos:])[0]
break
# Cleaning up states after end of parsing
if state == READ_INTEGER:
integer = helper
if state == READ_FRACTION:
fraction = helper
if state == READ_EXPONENTIAL:
exponential = helper
pattern = (padding_1, prefix, padding_2, integer, fraction, exponential,
padding_3, suffix, padding_4, grouping)
if neg_pattern is None:
neg_pattern = pattern
return pattern, neg_pattern
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