Add support of multiple barcodes per file

test/test_all.py

@@ -55,14 +55,29 @@ def test_possible_formats():
 @with_setup(setup_reader)
 def test_decoding_multiple():
     reader = zxing.BarCodeReader()
-    filenames = [os.path.join(test_barcode_dir, filename) for filename, expected_format, expected_raw in test_barcodes]
-    for dec, (filename, expected_format, expected_raw) in zip(reader.decode(filenames, pure_barcode=True), test_barcodes):
+    for filename, expected_format, expected_raw in test_barcodes:
+        full_filename = os.path.join(test_barcode_dir, filename)
+        dec = reader.decode(full_filename, pure_barcode=True)
         if dec.raw != expected_raw:
             raise AssertionError('{}: Expected {!r} but got {!r}'.format(filename, expected_raw, dec.parsed))
         if dec.format != expected_format:
             raise AssertionError('{}: Expected {!r} but got {!r}'.format(filename, expected_format, dec.format))
 
 
+@with_setup(setup_reader)
+def test_multi():
+    reader = zxing.BarCodeReader()
+    filename = "multi.png"
+    full_filename = os.path.join(test_barcode_dir, filename)
+    dec = reader.decode_as_list(full_filename, multi=True)
+
+    expected = ["This should be QR_CODE", "This should be PDF_417"]
+    actual = [barcode.parsed for barcode in dec]
+
+    if expected != actual:
+        raise AssertionError('{}: Expected {!r} but got {!r}'.format(filename, expected, actual))
+
+
 def test_parsing():
     dec = zxing.BarCode.parse("""
 file:///tmp/default.png (format: FAKE_DATA, type: TEXT):

zxing/__init__.py

@@ -31,7 +31,7 @@ def __init__(self, classpath=None, java=None):
         else:
             self.classpath = os.path.join(os.path.dirname(__file__), 'java', '*')
 
-    def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcode=False, products_only=False):
+    def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcode=False, products_only=False, multi=False):
         possible_formats = (possible_formats,) if isinstance(possible_formats, str) else possible_formats
 
         if isinstance(filenames, str):
@@ -44,6 +44,9 @@ def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcod
         cmd = [self.java, '-cp', self.classpath, self.cls] + file_uris
         if try_harder:
             cmd.append('--try_harder')
+        if multi:
+            cmd.append('--multi')
+            one_file = False
         if pure_barcode:
             cmd.append('--pure_barcode')
         if products_only:
@@ -89,9 +92,13 @@ def decode(self, filenames, try_harder=False, possible_formats=None, pure_barcod
         else:
             # zxing (insanely) randomly reorders the output blocks, so we have to put them back in the
             # expected order, based on their URIs
-            d = {c.uri: c for c in codes}
-            return [d[f] for f in file_uris]
+            return sorted(codes, key=lambda barcode: barcode and barcode.uri)
 
+    def decode_as_list(self, filenames, try_harder=False, possible_formats=None, pure_barcode=False, multi=False):
+        result = self.decode(filenames, try_harder, possible_formats, pure_barcode, multi)
+        if isinstance(result, list):
+            return result
+        return [result]
 
 class CLROutputBlock(Enum):
     UNKNOWN = 0