/usr/share/sugar/activities/Calculate.activity/mathlib.py is in sugar-calculate-activity 43-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 | # -*- coding: UTF-8 -*-
# mathlib.py, generic math library wrapper
# by Reinier Heeres <reinier@heeres.eu>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# Change log:
# 2007-07-03: rwh, first version
import types
import math
from decimal import Decimal
from rational import Rational
import logging
_logger = logging.getLogger('MathLib')
from gettext import gettext as _
import locale
# Python 2.5 does not have a binary formatter built-in
# This requires a function b10bin() to interpret the result
def format_bin(n):
bits = ''
while n > 0:
if n & 1:
bits = '1' + bits
else:
bits = '0' + bits
n >>= 1
return 'b10bin(%s)' % bits
try:
_BIN = bin
except:
_BIN = format_bin
class MathLib:
ANGLE_DEG = math.pi / 180
ANGLE_RAD = 1
ANGLE_GRAD = 1
FORMAT_EXPONENT = 1
FORMAT_SCIENTIFIC = 2
def __init__(self):
self.set_format_type(self.FORMAT_SCIENTIFIC)
self.set_digit_limit(9)
self.set_chop_zeros(True)
self.set_integer_base(10)
self._setup_i18n()
def _setup_i18n(self):
loc = locale.localeconv()
# The separator to mark thousands (default: ',')
self.thousand_sep = loc['thousands_sep']
if self.thousand_sep == "" or self.thousand_sep is None:
self.thousand_sep = ","
# The separator to mark fractions (default: '.')
self.fraction_sep = loc['decimal_point']
if self.fraction_sep == "" or self.fraction_sep is None:
self.fraction_sep = "."
# TRANS: multiplication symbol (default: '×')
self.mul_sym = _('mul_sym')
if len(self.mul_sym) == 0 or len(self.mul_sym) > 3:
self.mul_sym = '×'
# TRANS: division symbol (default: '÷')
self.div_sym = _('div_sym')
if len(self.div_sym) == 0 or len(self.div_sym) > 3:
self.div_sym = '÷'
# TRANS: equal symbol (default: '=')
self.equ_sym = _('equ_sym')
if len(self.equ_sym) == 0 or len(self.equ_sym) > 3:
self.equ_sym = '='
def set_format_type(self, fmt, digit_limit=9):
self.format_type = fmt
_logger.debug('Format type set to %s', fmt)
def set_integer_base(self, base):
if base not in (2, 8, 10, 16):
_logger.warning('Unsupported integer base requested')
return False
self.integer_base = base
_logger.debug('Integer base set to %s', base)
def set_digit_limit(self, digits):
self.digit_limit = digits
_logger.debug('Digit limit set to %s', digits)
def set_chop_zeros(self, chop):
self.chop_zeros = bool(chop)
_logger.debug('Chop zeros set to %s', self.chop_zeros)
def d(self, val):
if isinstance(val, Decimal):
return val
elif type(val) in (types.IntType, types.LongType):
return Decimal(val)
elif isinstance(val, str):
d = Decimal(val)
return d.normalize()
elif isinstance(val, float) or hasattr(val, '__float__'):
s = '%.18e' % float(val)
d = Decimal(s)
return d.normalize()
else:
return None
def parse_number(self, s):
s = s.replace(self.fraction_sep, '.')
try:
d = Decimal(s)
if self.is_int(d):
return int(d)
else:
return Decimal(s)
except Exception, inst:
return None
_BASE_FUNC_MAP = {
2: _BIN,
8: oct,
16: hex,
}
def format_int(self, n, base=None):
if base is None:
base = self.integer_base
ret = self._BASE_FUNC_MAP[base](long(n))
return ret.rstrip('L')
def format_decimal(self, n):
a = int(n)
if a == n:
return str(n)
if self.chop_zeros:
n = n.normalize()
(sign, digits, exp) = n.as_tuple()
if len(digits) > self.digit_limit:
exp += len(digits) - self.digit_limit
digits = digits[:self.digit_limit]
if len(digits) < self.digit_limit:
exp -= self.digit_limit - len(digits)
digits += (0,) * (self.digit_limit - len(digits))
print exp, digits
if sign:
res = "-"
else:
res = ""
int_len = len(digits) + exp
if int_len == 0:
if exp < -self.digit_limit:
disp_exp = exp + len(digits)
else:
disp_exp = 0
elif -self.digit_limit < int_len < self.digit_limit:
disp_exp = 0
else:
disp_exp = int_len - 1
dot_pos = int_len - disp_exp
# _logger.debug('len(digits) %d, exp: %d, int_len: %d, disp_exp: %d,
# dot_pos: %d', len(digits), exp, int_len, disp_exp, dot_pos)
if dot_pos < 0:
res = '0' + self.fraction_sep
for i in xrange(dot_pos, 0):
res += '0'
for i in xrange(len(digits)):
if i == dot_pos:
if i == 0:
res += '0' + self.fraction_sep
else:
res += self.fraction_sep
res += str(digits[i])
if int_len > 0 and len(digits) < dot_pos:
for i in xrange(len(digits), dot_pos):
res += '0'
if disp_exp != 0:
if self.format_type == self.FORMAT_EXPONENT:
res = res + 'e%d' % disp_exp
elif self.format_type == self.FORMAT_SCIENTIFIC:
res = res + u'×10**%d' % disp_exp
return res
def format_number(self, n):
if isinstance(n, bool):
if n:
return 'True'
else:
return 'False'
elif isinstance(n, str):
return n
elif isinstance(n, unicode):
return n
elif isinstance(n, str):
return _('Undefined')
elif isinstance(n, int):
n = self.d(n)
elif isinstance(n, float):
n = self.d(n)
elif isinstance(n, long):
n = self.d(n)
elif isinstance(n, Rational):
n = self.d(Decimal(n.n) / Decimal(n.d))
elif not isinstance(n, Decimal):
return _('Error: unsupported type')
if self.is_int(n) and self.integer_base != 10:
return self.format_int(n)
else:
return self.format_decimal(n)
def short_format(self, n):
ret = self.format_number(n)
if len(ret) > 7:
ret = "%1.1e" % n
return ret
def is_int(self, n):
if isinstance(n, int) or isinstance(n, long):
return True
if not isinstance(n, Decimal):
n = self.d(n)
if n is None:
return False
(sign, d, e) = n.normalize().as_tuple()
return e >= 0
if __name__ == "__main__":
ml = MathLib()
val = 0.99999999999999878
print 'is_int(%.18e): %s' % (val, ml.is_int(val))
# Beyond float precision
val = 0.999999999999999999
print 'is_int(%.18e): %s' % (val, ml.is_int(val))
val = ml.d(0.99999999999999878) ** 2
print 'is_int(%s): %s' % (val, ml.is_int(val))
vals = ('0.1230', '12.340', '0.0123', '1230', '123.0', '1.230e17')
for valstr in vals:
val = Decimal(valstr)
print 'Formatted value: %s (from %s)' % (ml.format_number(val), valstr)
for base in (2, 8, 16):
print 'Format 252 in base %d: %s' % (base, ml.format_int(252, base))
|