Current File : //lib/python3/dist-packages/reportlab/lib/formatters.py
#! /usr/bin/python3
#Copyright ReportLab Europe Ltd. 2000-2017
#see license.txt for license details
#history https://hg.reportlab.com/hg-public/reportlab/log/tip/src/reportlab/lib/formatters.py
__all__=('Formatter','DecimalFormatter')
__version__='3.3.0'
__doc__="""
These help format numbers and dates in a user friendly way.
Used by the graphics framework.
"""
import re
class Formatter:
"Base formatter - simply applies python format strings"
def __init__(self, pattern):
self.pattern = pattern
def format(self, obj):
return self.pattern % obj
def __repr__(self):
return "%s('%s')" % (self.__class__.__name__, self.pattern)
def __call__(self, x):
return self.format(x)
_ld_re=re.compile(r'^\d*\.')
_tz_re=re.compile('0+$')
class DecimalFormatter(Formatter):
"""lets you specify how to build a decimal.
A future NumberFormatter class will take Microsoft-style patterns
instead - "$#,##0.00" is WAY easier than this."""
def __init__(self, places=2, decimalSep='.', thousandSep=None, prefix=None, suffix=None):
if places=='auto':
self.calcPlaces = self._calcPlaces
else:
self.places = places
self.dot = decimalSep
self.comma = thousandSep
self.prefix = prefix
self.suffix = suffix
def _calcPlaces(self,V):
'''called with the full set of values to be formatted so we can calculate places'''
self.places = max([len(_tz_re.sub('',_ld_re.sub('',str(v)))) for v in V])
def format(self, num):
# positivize the numbers
sign=num<0
if sign:
num = -num
places, sep = self.places, self.dot
strip = places<=0
if places and strip: places = -places
strInt = ('%.' + str(places) + 'f') % num
if places:
strInt, strFrac = strInt.split('.')
strFrac = sep + strFrac
if strip:
while strFrac and strFrac[-1] in ['0',sep]: strFrac = strFrac[:-1]
else:
strFrac = ''
if self.comma is not None:
strNew = ''
while strInt:
left, right = strInt[0:-3], strInt[-3:]
if left == '':
#strNew = self.comma + right + strNew
strNew = right + strNew
else:
strNew = self.comma + right + strNew
strInt = left
strInt = strNew
strBody = strInt + strFrac
if sign: strBody = '-' + strBody
if self.prefix:
strBody = self.prefix + strBody
if self.suffix:
strBody = strBody + self.suffix
return strBody
def __repr__(self):
return "%s(places=%d, decimalSep=%s, thousandSep=%s, prefix=%s, suffix=%s)" % (
self.__class__.__name__,
self.places,
repr(self.dot),
repr(self.comma),
repr(self.prefix),
repr(self.suffix)
)
if __name__=='__main__':
def t(n, s, places=2, decimalSep='.', thousandSep=None, prefix=None, suffix=None):
f=DecimalFormatter(places,decimalSep,thousandSep,prefix,suffix)
r = f(n)
print("places=%2d dot=%-4s comma=%-4s prefix=%-4s suffix=%-4s result=%10s %s" %(f.places, f.dot, f.comma, f.prefix, f.suffix,r, r==s and 'OK' or 'BAD'))
t(1000.9,'1,000.9',1,thousandSep=',')
t(1000.95,'1,001.0',1,thousandSep=',')
t(1000.95,'1,001',-1,thousandSep=',')
t(1000.9,'1,001',0,thousandSep=',')
t(1000.9,'1000.9',1)
t(1000.95,'1001.0',1)
t(1000.95,'1001',-1)
t(1000.9,'1001',0)
t(1000.1,'1000.1',1)
t(1000.55,'1000.6',1)
t(1000.449,'1000.4',-1)
t(1000.45,'1000',0)
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