Merge pull request #37 from MDziwny/master

add support for gs1-128

Author: Hugo Osvaldo Barrera

barcode/__init__.py

@@ -12,7 +12,7 @@
 """
 
 from barcode.errors import BarcodeNotFoundError
-from barcode.codex import Code39, PZN, Code128
+from barcode.codex import Code39, PZN, Code128, Gs1_128
 from barcode.ean import EAN8, EAN13, EAN14, JAN
 from barcode.isxn import ISBN10, ISBN13, ISSN
 from barcode.upc import UPCA
@@ -43,6 +43,7 @@
     pzn=PZN,
     code128=Code128,
     itf=ITF,
+    gs1_128=Gs1_128,
 )
 
 PROVIDED_BARCODES = list(__BARCODE_MAP)

barcode/codex.py

@@ -258,5 +258,25 @@ def render(self, writer_options=None, text=None):
         return Barcode.render(self, options, text)
 
 
+class Gs1_128(Code128):
+    """
+    following the norm, a gs1-128 barcode is a subset of code 128 barcode,
+    it can be generated by prepending the code with the FNC1 character
+    https://en.wikipedia.org/wiki/GS1-128
+    https://www.gs1-128.info/
+    """
+
+    name = 'GS1-128'
+
+    FNC1_CHAR = '\xf1'
+
+    def __init__(self, code, writer=None):
+        code = self.FNC1_CHAR + code
+        super(Gs1_128, self).__init__(code, writer)
+
+    def get_fullcode(self):
+        return super(Gs1_128, self).get_fullcode()[1:]
+
+
 # For pre 0.8 compatibility
 PZN = PZN7

test.py

@@ -149,6 +149,10 @@ def test_isbn13(self):
         isbn = get_barcode('isbn13', '978376926085')
         self.assertEqual('9783769260854', isbn.get_fullcode())
 
+    def test_gs1_128(self):
+        gs1_128 = get_barcode('gs1_128', '00376401856400470087')
+        self.assertEqual('00376401856400470087', gs1_128.get_fullcode())
+
 
 if __name__ == '__main__':
     test()