Add support for ppm

libmat2/images.py

@@ -1,6 +1,7 @@
 import imghdr
 import os
-from typing import Set, Dict, Union
+import re
+from typing import Set, Dict, Union, Any
 
 import cairo
 
@@ -9,10 +10,11 @@ gi.require_version('GdkPixbuf', '2.0')
 gi.require_version('Rsvg', '2.0')
 from gi.repository import GdkPixbuf, GLib, Rsvg
 
-from . import exiftool
+from . import exiftool, abstract
 
 # Make pyflakes happy
 assert Set
+assert Any
 
 class SVGParser(exiftool.ExiftoolParser):
     mimetypes = {'image/svg+xml', }
@@ -138,3 +140,23 @@ class TiffParser(GdkPixbufAbstractParser):
                       'FilePermissions', 'FileSize', 'FileType',
                       'FileTypeExtension', 'ImageHeight', 'ImageSize',
                       'ImageWidth', 'MIMEType', 'Megapixels', 'SourceFile'}
+
+class PPMParser(abstract.AbstractParser):
+    mimetypes = {'image/x-portable-pixmap'}
+
+    def get_meta(self) -> Dict[str, Union[str, dict]]:
+        meta = {}  # type: Dict[str, Union[str, Dict[Any, Any]]]
+        with open(self.filename) as f:
+            for idx, line in enumerate(f):
+                if line.lstrip().startswith('#'):
+                    meta[str(idx)] = line.lstrip().rstrip()
+        return meta
+
+    def remove_all(self) -> bool:
+        with open(self.filename) as fin:
+            with open(self.output_filename, 'w') as fout:
+                for line in fin:
+                    if not line.lstrip().startswith('#'):
+                        line = re.sub(r"\s+", "", line, flags=re.UNICODE)
+                        fout.write(line)
+        return True

tests/data/dirty.ppm

@@ -0,0 +1,8 @@
+P3
+# A metadata
+3 2 1
+1 0 1   0 1 0   0 0 1
+# And an other one
+1 1 0   1 0 1   1 0 0
+  # and a final one here
+

tests/test_libmat2.py

@@ -113,6 +113,14 @@ class TestGetMeta(unittest.TestCase):
         meta = p.get_meta()
         self.assertEqual(meta['Comment'], 'Created with GIMP')
 
+    def test_ppm(self):
+        p = images.PPMParser('./tests/data/dirty.ppm')
+        meta = p.get_meta()
+        self.assertEqual(meta['1'], '# A metadata')
+        self.assertEqual(meta['4'], '# And an other one')
+        self.assertEqual(meta['6'], '# and a final one here')
+
+
     def test_tiff(self):
         p = images.TiffParser('./tests/data/dirty.tiff')
         meta = p.get_meta()
@@ -887,3 +895,24 @@ class TestCleaning(unittest.TestCase):
 
         p = images.SVGParser('./tests/data/weird.svg')
         self.assertEqual(p.get_meta()['Xmlns'], 'http://www.w3.org/1337/svg')
+
+    def test_ppm(self):
+        shutil.copy('./tests/data/dirty.ppm', './tests/data/clean.ppm')
+        p = images.PPMParser('./tests/data/clean.ppm')
+
+        meta = p.get_meta()
+        print(meta)
+        self.assertEqual(meta['1'], '# A metadata')
+
+        ret = p.remove_all()
+        self.assertTrue(ret)
+
+        p = images.PPMParser('./tests/data/clean.cleaned.ppm')
+        self.assertEqual(p.get_meta(), {})
+        self.assertTrue(p.remove_all())
+
+        os.remove('./tests/data/clean.ppm')
+        os.remove('./tests/data/clean.cleaned.ppm')
+        os.remove('./tests/data/clean.cleaned.cleaned.ppm')
+
+