Even better fix for 8f87118725

(previous solution still did not work for numbers like 123.4 with precision < 3)

scour/scour.py

@@ -2622,16 +2622,7 @@ def scourUnitlessLength(length, needsRendererWorkaround=False):  # length is of
     """
     if not isinstance(length, Decimal):
         length = getcontext().create_decimal(str(length))
-
+    initial_length = length
-    # remove trailing zeroes as we do not care for significance
-    intLength = length.to_integral_value()
-    if length == intLength:
-        length = Decimal(intLength)
-    else:
-        length = length.normalize()
-
-    # Gather the initial non-scientific notation version of the coordinate (we want to compare with it later)
-    initial_value = '{0:f}'.format(length)
 
     # reduce numeric precision
     # plus() corresponds to the unary prefix plus operator and applies context precision and rounding
@@ -2645,7 +2636,10 @@ def scourUnitlessLength(length, needsRendererWorkaround=False):  # length is of
         length = length.normalize()
 
     # Gather the non-scientific notation version of the coordinate.
+    # Re-quantize from the initial value to prevent unnecessary loss of precision
+    # (e.g. 123.4 should become 123, not 120 or even 100)
     nonsci = '{0:f}'.format(length)
+    nonsci = '{0:f}'.format(initial_length.quantize(Decimal(nonsci)))
     if not needsRendererWorkaround:
         if len(nonsci) > 2 and nonsci[:2] == '0.':
             nonsci = nonsci[1:]  # remove the 0, leave the dot
@@ -2666,11 +2660,7 @@ def scourUnitlessLength(length, needsRendererWorkaround=False):  # length is of
         if len(sci) < len(nonsci):
             return_value = sci
 
-    # Return the shortest representation (if they are equal prefer the original as it still has the full precision)
-    if len(return_value) < len(initial_value):
     return return_value
-    else:
-        return initial_value
 
 
 def reducePrecision(element):

testscour.py

@@ -968,6 +968,9 @@ class KeepPrecisionInPathDataIfSameLength(unittest.TestCase):
         self.assertEqual(paths[4].getAttribute('d'), "m-1-12-123-1e3 -1e4 -1e5",
                          'Precision not correctly reduced with "--set-precision=1" '
                          'for path with ID ' + paths[4].getAttribute('id'))
+        self.assertEqual(paths[5].getAttribute('d'), "m123 101-123-101",
+                         'Precision not correctly reduced with "--set-precision=1" '
+                         'for path with ID ' + paths[5].getAttribute('id'))
 
         doc = scourXmlFile('unittests/path-precision.svg', parse_args(['--set-precision=2']))
         paths = doc.getElementsByTagNameNS(SVGNS, 'path')
@@ -978,6 +981,9 @@ class KeepPrecisionInPathDataIfSameLength(unittest.TestCase):
         self.assertEqual(paths[4].getAttribute('d'), "m-1-12-123-1234-12345-1.2e5",
                          'Precision not correctly reduced with "--set-precision=2" '
                          'for path with ID ' + paths[4].getAttribute('id'))
+        self.assertEqual(paths[5].getAttribute('d'), "m123 101-123-101",
+                         'Precision not correctly reduced with "--set-precision=2" '
+                         'for path with ID ' + paths[5].getAttribute('id'))
 
         doc = scourXmlFile('unittests/path-precision.svg', parse_args(['--set-precision=3']))
         paths = doc.getElementsByTagNameNS(SVGNS, 'path')
@@ -988,6 +994,22 @@ class KeepPrecisionInPathDataIfSameLength(unittest.TestCase):
         self.assertEqual(paths[4].getAttribute('d'), "m-1-12-123-1234-12345-123456",
                          'Precision not correctly reduced with "--set-precision=3" '
                          'for path with ID ' + paths[4].getAttribute('id'))
+        self.assertEqual(paths[5].getAttribute('d'), "m123 101-123-101",
+                         'Precision not correctly reduced with "--set-precision=3" '
+                         'for path with ID ' + paths[5].getAttribute('id'))
+
+        doc = scourXmlFile('unittests/path-precision.svg', parse_args(['--set-precision=4']))
+        paths = doc.getElementsByTagNameNS(SVGNS, 'path')
+        for path in paths[1:3]:
+            self.assertEqual(path.getAttribute('d'), "m1 12 123 1234 12345 123456",
+                             'Precision not correctly reduced with "--set-precision=4" '
+                             'for path with ID ' + path.getAttribute('id'))
+        self.assertEqual(paths[4].getAttribute('d'), "m-1-12-123-1234-12345-123456",
+                         'Precision not correctly reduced with "--set-precision=4" '
+                         'for path with ID ' + paths[4].getAttribute('id'))
+        self.assertEqual(paths[5].getAttribute('d'), "m123.5 101-123.5-101",
+                         'Precision not correctly reduced with "--set-precision=4" '
+                         'for path with ID ' + paths[5].getAttribute('id'))
 
 
 class RemoveEmptyLineSegmentsFromPath(unittest.TestCase):

unittests/path-precision.svg

@@ -6,4 +6,6 @@
   <path id="p2" d="m  1.0  12.0  123.0  1234.0  12345.0  123456.0" />
   <path id="p3" d="m 01   012   0123   01234   012345   0123456  " />
   <path id="p4" d="m -1   -12   -123   -1234   -12345   -123456  " />
+  
+  <path id="p6" d="m 123.456 101.001 -123.456 -101.001" />
 </svg>