* Added simple ITF (Interleaved 2-of-5) support.

Author: bjornarle

barcode/__init__.py

@@ -39,6 +39,7 @@
 from barcode.ean import EAN8, EAN13, JAN
 from barcode.isxn import ISBN10, ISBN13, ISSN
 from barcode.upc import UPCA
+from barcode.itf import ITF
 
 try:
     _strbase = basestring  # lint:ok
@@ -62,6 +63,7 @@
     code39=Code39,
     pzn=PZN,
     code128=Code128,
+    itf=ITF,
 )
 
 PROVIDED_BARCODES = list(__BARCODE_MAP.keys())

barcode/charsets/itf.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import unicode_literals
+
+# W = Wide bar
+# w = wide space
+# N = Narrow bar
+# n = narrow space
+
+START = 'NnNn'
+STOP = 'WnN'
+CODES = ('NNWWN', 'WNNNW', 'NWNNW', 'WWNNN', 'NNWNW', 'WNWNN', 'NWWNN', 'NNNWW', 'WNNWN', 'NWNWN')

barcode/itf.py

@@ -0,0 +1,79 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import unicode_literals
+
+"""Module: barcode.itf
+
+:Provided barcodes: Interleaved 2 of 5
+"""
+__docformat__ = 'restructuredtext en'
+
+from barcode.base import Barcode
+from barcode.charsets import itf
+from barcode.errors import *
+
+MIN_SIZE = 0.2
+MIN_QUIET_ZONE = 6.4
+
+class ITF(Barcode):
+    """Initializes a new ITF instance.
+
+    :parameters:
+        code : String
+            ITF (Interleaved 2 of 5) numeric string
+        writer : barcode.writer Instance
+            The writer to render the barcode (default: SVGWriter).
+        narrow: Integer
+            Width of the narrow elements (default: 2)
+        wide: Integer
+            Width of the wide elements (default: 5)
+            wide/narrow must be in the range 2..3
+    """
+
+    name = 'ITF'
+
+    def __init__(self, code, writer=None, narrow=2, wide=5):
+        if not code.isdigit():
+            raise IllegalCharacterError('ITF code can only contain numbers.')
+        #Length must be even, prepend 0 if necessary
+        if len(code) % 2 != 0:
+            code = '0' + code
+        self.code = code
+        self.writer = writer or Barcode.default_writer()
+        self.narrow = narrow
+        self.wide = wide
+
+    def __unicode__(self):
+        return self.code
+
+    __str__ = __unicode__
+
+    def get_fullcode(self):
+        return self.code
+
+    def build(self):
+        data = itf.START
+        for i in range(0, len(self.code), 2):
+            bars_digit = int(self.code[i])
+            spaces_digit = int(self.code[i+1])
+            for j in range(5):
+                data += itf.CODES[bars_digit][j].upper()
+                data += itf.CODES[spaces_digit][j].lower()
+        data += itf.STOP
+        print data
+        raw = ''
+        for e in data:
+            if e == 'W':
+                raw += '1' * self.wide
+            if e == 'w':
+                raw += '0' * self.wide
+            if e == 'N':
+                raw += '1' * self.narrow
+            if e == 'n':
+                raw += '0' * self.narrow
+        return [raw]
+
+    def render(self, writer_options):
+        options = dict(module_width=MIN_SIZE/self.narrow, quiet_zone=MIN_QUIET_ZONE)
+        options.update(writer_options or {})
+        return Barcode.render(self, options)

test.py

@@ -60,6 +60,7 @@
     ('code39', 'Example Code 39'),
     ('pzn', '487780'),
     ('code128', 'Example Code 128 998866'),
+    ('itf', '12341234'),
 )