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codex.py
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executable file
·262 lines (211 loc) · 7.57 KB
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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from barcode.base import Barcode
from barcode.charsets import code128, code39
from barcode.errors import *
"""Module: barcode.codex
:Provided barcodes: Code 39, Code 128, PZN
"""
__docformat__ = 'restructuredtext en'
# Sizes
MIN_SIZE = 0.2
MIN_QUIET_ZONE = 2.54
def check_code(code, name, allowed):
wrong = []
for char in code:
if char not in allowed:
wrong.append(char)
if wrong:
raise IllegalCharacterError(
'The following characters are not valid for '
'{name}: {wrong}'.format(name=name, wrong=', '.join(wrong))
)
class Code39(Barcode):
"""Initializes a new Code39 instance.
:parameters:
code : String
Code 39 string without \* and checksum (added automatically if
`add_checksum` is True).
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
add_checksum : Boolean
Add the checksum to code or not (default: True).
"""
name = 'Code 39'
def __init__(self, code, writer=None, add_checksum=True):
self.code = code.upper()
if add_checksum:
self.code += self.calculate_checksum()
self.writer = writer or Barcode.default_writer()
check_code(self.code, self.name, code39.REF)
def __unicode__(self):
return self.code
__str__ = __unicode__
def get_fullcode(self):
return self.code
def calculate_checksum(self):
check = sum([code39.MAP[x][0] for x in self.code]) % 43
for k, v in code39.MAP.items():
if check == v[0]:
return k
def build(self):
chars = [code39.EDGE]
for char in self.code:
chars.append(code39.MAP[char][1])
chars.append(code39.EDGE)
return [code39.MIDDLE.join(chars)]
def render(self, writer_options=None, text=None):
options = dict(module_width=MIN_SIZE, quiet_zone=MIN_QUIET_ZONE)
options.update(writer_options or {})
return Barcode.render(self, options, text)
class PZN7(Code39):
"""Initializes new German number for pharmaceutical products.
:parameters:
pzn : String
Code to render.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = 'Pharmazentralnummer'
digits = 6
def __init__(self, pzn, writer=None):
pzn = pzn[:self.digits]
if not pzn.isdigit():
raise IllegalCharacterError('PZN can only contain numbers.')
if len(pzn) != self.digits:
raise NumberOfDigitsError('PZN must have {0} digits, not '
'{1}.'.format(self.digits, len(pzn)))
self.pzn = pzn
self.pzn = '{0}{1}'.format(pzn, self.calculate_checksum())
Code39.__init__(self, 'PZN-{0}'.format(self.pzn), writer,
add_checksum=False)
def get_fullcode(self):
return 'PZN-{0}'.format(self.pzn)
def calculate_checksum(self):
sum_ = sum([int(x) * int(y) for x, y in enumerate(self.pzn, start=2)])
checksum = sum_ % 11
if checksum == 10:
raise BarcodeError('Checksum can not be 10 for PZN.')
else:
return checksum
class PZN8(PZN7):
"""Will be fully added in v0.9."""
digits = 7
class Code128(Barcode):
"""Initializes a new Code128 instance. The checksum is added automatically
when building the bars.
:parameters:
code : String
Code 128 string without checksum (added automatically).
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = 'Code 128'
def __init__(self, code, writer=None):
self.code = code
self.writer = writer or Barcode.default_writer()
self._charset = 'B'
self._buffer = ''
check_code(self.code, self.name, code128.ALL)
def __unicode__(self):
return self.code
__str__ = __unicode__
@property
def encoded(self):
return self._build()
def get_fullcode(self):
return self.code
def _new_charset(self, which):
if which == 'A':
code = self._convert('TO_A')
elif which == 'B':
code = self._convert('TO_B')
elif which == 'C':
code = self._convert('TO_C')
self._charset = which
return [code]
def _maybe_switch_charset(self, pos):
char = self.code[pos]
next_ = self.code[pos:pos + 10]
def look_next():
digits = 0
for c in next_:
if c.isdigit():
digits += 1
else:
break
return digits > 3
codes = []
if self._charset == 'C' and not char.isdigit():
if char in code128.B:
codes = self._new_charset('B')
elif char in code128.A:
codes = self._new_charset('A')
if len(self._buffer) == 1:
codes.append(self._convert(self._buffer[0]))
self._buffer = ''
elif self._charset == 'B':
if look_next():
codes = self._new_charset('C')
elif char not in code128.B:
if char in code128.A:
codes = self._new_charset('A')
elif self._charset == 'A':
if look_next():
codes = self._new_charset('C')
elif char not in code128.A:
if char in code128.B:
codes = self._new_charset('B')
return codes
def _convert(self, char):
if self._charset == 'A':
return code128.A[char]
elif self._charset == 'B':
return code128.B[char]
elif self._charset == 'C':
if char in code128.C:
return code128.C[char]
elif char.isdigit():
self._buffer += char
if len(self._buffer) == 2:
value = int(self._buffer)
self._buffer = ''
return value
def _try_to_optimize(self, encoded):
if encoded[1] in code128.TO:
encoded[:2] = [code128.TO[encoded[1]]]
return encoded
def _calculate_checksum(self, encoded):
cs = [encoded[0]]
for i, code_num in enumerate(encoded[1:], start=1):
cs.append(i * code_num)
return sum(cs) % 103
def _build(self):
encoded = [code128.START_CODES[self._charset]]
for i, char in enumerate(self.code):
encoded.extend(self._maybe_switch_charset(i))
code_num = self._convert(char)
if code_num is not None:
encoded.append(code_num)
# Finally look in the buffer
if len(self._buffer) == 1:
encoded.extend(self._new_charset('B'))
encoded.append(self._convert(self._buffer[0]))
self._buffer = ''
encoded = self._try_to_optimize(encoded)
return encoded
def build(self):
encoded = self._build()
encoded.append(self._calculate_checksum(encoded))
code = ''
for code_num in encoded:
code += code128.CODES[code_num]
code += code128.STOP
code += '11'
return [code]
def render(self, writer_options=None, text=None):
options = dict(module_width=MIN_SIZE, quiet_zone=MIN_QUIET_ZONE)
options.update(writer_options or {})
return Barcode.render(self, options, text)
# For pre 0.8 compatibility
PZN = PZN7