Wrapping indentation for sake of 2.7. #177

Textwrap's indent method is not available on 2.7, so we have to fake it
ourselves.

glymur/jp2box.py

@@ -98,10 +98,36 @@ class Jp2kBox(object):
         for box in self.box:
             boxstr = str(box)
             # Indent the child boxes to make the association clear.
-            msg += '\n' + textwrap.indent(boxstr, '    ')
+            msg += '\n' + self._indent(boxstr)
         return msg
 
 
+    def _indent(self, textstr, indent_level=4):
+        """
+        Indent a string.
+
+        Textwrap's indent method only exists for 3.3 or above.  In 2.7 we have
+        to fake it.
+
+        Parameters
+        ----------
+        textstring : str
+            String to be indented.
+        indent_level : str
+            Number of spaces of indentation to add.
+        
+        Returns
+        -------
+        indented_string : str
+            Possibly multi-line string indented a certain bit.
+        """
+        if sys.hexversion >= 0x03030000:
+            return textwrap.indent(textstr, ' ' * indent_level)
+        else:
+            lst = [(' ' * indent_level + x) for x in textstr.split('\n')]
+            return '\n'.join(lst)
+
+
     def _write_superbox(self, fptr):
         """Write a superbox.
 
@@ -888,7 +914,7 @@ class ContiguousCodestreamBox(Jp2kBox):
 
         msg += '\n    Main header:'
         for segment in self.main_header.segment:
-            msg += '\n' + textwrap.indent(str(segment), '        ')
+            msg += '\n' + self._indent(str(segment), indent_level=8)
 
         return msg
 
@@ -2565,7 +2591,7 @@ class XMLBox(Jp2kBox):
                                     pretty_print=True).decode('utf-8')
         else:
             xmlstring = 'None'
-        msg += textwrap.indent(xmlstring, '    ')
+        msg += self._indent(xmlstring)
         return msg
 
     def write(self, fptr):
@@ -2974,7 +3000,7 @@ class UUIDBox(Jp2kBox):
                                     encoding='utf-8',
                                     pretty_print=True).decode('utf-8')
             # indent it a bit
-            xmlstring = textwrap.indent(xmlstring.rstrip(), '    ')
+            xmlstring = self._indent(xmlstring.rstrip())
             msg += line.format(xmlstring)
         elif self.uuid.bytes == b'JpgTiffExif->JP2':
             msg += '\n    UUID Data:  {0}'.format(str(self.data))

glymur/test/fixtures.py

@@ -45,6 +45,32 @@ except:
     raise
 
 
+def _indent(textstr):
+    """
+    Indent a string.
+
+    Textwrap's indent method only exists for 3.3 or above.  In 2.7 we have
+    to fake it.
+
+    Parameters
+    ----------
+    textstring : str
+        String to be indented.
+    indent_level : str
+        Number of spaces of indentation to add.
+    
+    Returns
+    -------
+    indented_string : str
+        Possibly multi-line string indented a certain bit.
+    """
+    if sys.hexversion >= 0x03030000:
+        return textwrap.indent(textstr, '    ')
+    else:
+        lst = [('    ' + x) for x in textstr.split('\n')]
+        return '\n'.join(lst)
+
+
 def opj_data_file(relative_file_name):
     """Compact way of forming a full filename from OpenJPEG's test suite."""
     jfile = os.path.join(OPJ_DATA_ROOT, relative_file_name)
@@ -270,12 +296,12 @@ nemo_xmp = """<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
 nemo_xmp_box = """UUID Box (uuid) @ (77, 3146)
     UUID:  be7acfcb-97a9-42e8-9c71-999491e3afac (XMP)
     UUID Data:
-{0}""".format(textwrap.indent(nemo_xmp, '    '))
+{0}""".format(_indent(nemo_xmp))
 
 nemo_xmp_box = """UUID Box (uuid) @ (77, 3146)
     UUID:  be7acfcb-97a9-42e8-9c71-999491e3afac (XMP)
     UUID Data:
-{0}""".format(textwrap.indent(nemo_xmp, '    '))
+{0}""".format(_indent(nemo_xmp))
 
 SimpleRDF = """<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
   <rdf:Description rdf:about='Test:XMPCoreCoverage/kSimpleRDF'
@@ -419,7 +445,7 @@ Contiguous Codestream Box (jp2c) @ (3223, 1132296)
             Step size:  [(0, 8), (0, 9), (0, 9), (0, 10)]
         CME marker segment @ (3305, 37)
             "Created by OpenJPEG version 2.0.0"'''
-nemo_dump_full = dump.format(textwrap.indent(nemo_xmp, '    '))
+nemo_dump_full = dump.format(_indent(nemo_xmp))
 
 nemo_dump_short = r"""JPEG 2000 Signature Box (jP  ) @ (0, 12)
 File Type Box (ftyp) @ (12, 20)
@@ -506,7 +532,7 @@ UUID Box (uuid) @ (77, 3146)
     UUID Data:
 {0}
 Contiguous Codestream Box (jp2c) @ (3223, 1132296)"""
-nemo_dump_no_codestream = dump.format(textwrap.indent(nemo_xmp, '    '))
+nemo_dump_no_codestream = dump.format(_indent(nemo_xmp))
 
 nemo_dump_no_codestream_no_xml = r"""JPEG 2000 Signature Box (jP  ) @ (0, 12)
     Signature:  0d0a870a

glymur/test/test_printing.py

@@ -132,7 +132,9 @@ class TestPrinting(unittest.TestCase):
         lst = actual.split('\n')
         lst = lst[1:]
         actual = '\n'.join(lst)
-        self.assertEqual(actual, fixtures.nemo_dump_no_xml)
+        expected = fixtures.nemo_dump_no_xml
+        self.maxDiff = None
+        self.assertEqual(actual, expected)
 
     def test_printoptions_short(self):
         """Verify printed output when short=True"""