Add support for border-image-source and border-image-slice.

docs/api_reference.rst

@@ -558,10 +558,10 @@ background layers per box), including the ``background``, ``background-color``,
 WeasyPrint also supports the `rounded corners part`_ of this module, including
 the ``border-radius`` property.
 
-WeasyPrint does **not** support the `border images part`_ of this module,
-including the ``border-image``, ``border-image-source``,
-``border-image-slice``, ``border-image-width``, ``border-image-outset`` and
-``border-image-repeat`` properties.
+WeasyPrint also supports the `border images part`_ of this module, including the
+``border-image``, ``border-image-source``, ``border-image-slice``,
+``border-image-width``, ``border-image-outset`` and ``border-image-repeat``
+properties.
 
 WeasyPrint does **not** support the `box shadow part`_ of this module,
 including the ``box-shadow`` property. This feature has been implemented in a

tests/css/test_expanders.py

@@ -398,6 +398,62 @@ def test_border_radius_invalid(rule, message):
     assert_invalid(f'border-radius: {rule}', message)
 
 
+@assert_no_logs
+@pytest.mark.parametrize('rule, result', (
+    ('url(border.png) 27', {
+        'border_image_source': ('url', 'https://weasyprint.org/foo/border.png'),
+        'border_image_slice': ((27, None),),
+    }),
+    ('url(border.png) 10 / 4 / 2 round stretch', {
+        'border_image_source': ('url', 'https://weasyprint.org/foo/border.png'),
+        'border_image_slice': ((10, None),),
+        'border_image_width': ((4, None),),
+        'border_image_outset': ((2, None),),
+        'border_image_repeat': (('round', 'stretch')),
+    }),
+    ('10 // 2', {
+        'border_image_slice': ((10, None),),
+        'border_image_outset': ((2, None),),
+    }),
+    ('5.5%', {
+        'border_image_slice': ((5.5, '%'),),
+    }),
+    ('stretch 2 url("border.png")', {
+        'border_image_source': ('url', 'https://weasyprint.org/foo/border.png'),
+        'border_image_slice': ((2, None),),
+        'border_image_repeat': (('stretch',)),
+    }),
+    ('1/2 round', {
+        'border_image_slice': ((1, None),),
+        'border_image_width': ((2, None),),
+        'border_image_repeat': (('round',)),
+    }),
+    ('none', {
+        'border_image_source': ('none', None),
+    }),
+))
+def test_border_image(rule, result):
+    assert expand_to_dict(f'border-image: {rule}') == result
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule, reason', (
+    ('url(border.png) url(border.png)', 'multiple source'),
+    ('10 10 10 10 10', 'multiple slice'),
+    ('1 / 2 / 3 / 4', 'invalid'),
+    ('/1', 'invalid'),
+    ('/1', 'invalid'),
+    ('round round round', 'invalid'),
+    ('-1', 'invalid'),
+    ('1 repeat 2', 'multiple slice'),
+    ('1% // 1%', 'invalid'),
+    ('1 / repeat', 'invalid'),
+    ('', 'no value'),
+))
+def test_border_image_invalid(rule, reason):
+    assert_invalid(f'border-image: {rule}', reason)
+
+
 @assert_no_logs
 @pytest.mark.parametrize('rule, result', (
     ('12px My Fancy Font, serif', {

tests/css/test_validation.py

@@ -362,6 +362,114 @@ def test_image_orientation_invalid(rule):
     assert_invalid(f'image-orientation: {rule}')
 
 
+@assert_no_logs
+@pytest.mark.parametrize('rule, value', (
+    ('1', ((1, None),)),
+    ('1 2    3 4', ((1, None), (2, None), (3, None), (4, None))),
+    ('50% 1000.1 0', ((50, '%'), (1000.1, None), (0, None))),
+    ('1% 2% 3% 4%', ((1, '%'), (2, '%'), (3, '%'), (4, '%'))),
+    ('fill 10% 20', ('fill', (10, '%'), (20, None))),
+    ('0 1 0.5 fill', ((0, None), (1, None), (0.5, None), 'fill')),
+))
+def test_border_image_slice(rule, value):
+    assert get_value(f'border-image-slice: {rule}') == value
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule', (
+    'none',
+    '1, 2',
+    '-10',
+    '-10%',
+    '1 2 3 -10%',
+    '-0.3',
+    '1 fill 2',
+    'fill 1 2 3 fill',
+))
+def test_border_image_slice_invalid(rule):
+    assert_invalid(f'border-image-slice: {rule}')
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule, value', (
+    ('1', ((1, None),)),
+    ('1 2    3 4', ((1, None), (2, None), (3, None), (4, None))),
+    ('50% 1000.1 0', ((50, '%'), (1000.1, None), (0, None))),
+    ('1% 2px 3em 4', ((1, '%'), (2, 'px'), (3, 'em'), (4, None))),
+    ('auto', ('auto',)),
+    ('1 auto', ((1, None), 'auto')),
+    ('auto auto', ('auto', 'auto')),
+    ('auto auto auto 2', ('auto', 'auto', 'auto', (2, None))),
+))
+def test_border_image_width(rule, value):
+    assert get_value(f'border-image-width: {rule}') == value
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule', (
+    'none',
+    '1, 2',
+    '1 -2',
+    '-10',
+    '-10%',
+    '1px 2px 3px -10%',
+    '-3px',
+    'auto auto auto auto auto',
+    '1 2 3 4 5',
+))
+def test_border_image_width_invalid(rule):
+    assert_invalid(f'border-image-width: {rule}')
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule, value', (
+    ('1', ((1, None),)),
+    ('1 2    3 4', ((1, None), (2, None), (3, None), (4, None))),
+    ('50px 1000.1 0', ((50, 'px'), (1000.1, None), (0, None))),
+    ('1in 2px 3em 4', ((1, 'in'), (2, 'px'), (3, 'em'), (4, None))),
+))
+def test_border_image_outset(rule, value):
+    assert get_value(f'border-image-outset: {rule}') == value
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule', (
+    'none',
+    'auto',
+    '1, 2',
+    '-10',
+    '1 -2',
+    '10%',
+    '1px 2px 3px -10px',
+    '-3px',
+    '1 2 3 4 5',
+))
+def test_border_image_outset_invalid(rule):
+    assert_invalid(f'border-image-outset: {rule}')
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule, value', (
+    ('stretch', ('stretch',)),
+    ('repeat repeat', ('repeat', 'repeat')),
+    ('round     space', ('round', 'space')),
+))
+def test_border_image_repeat(rule, value):
+    assert get_value(f'border-image-repeat: {rule}') == value
+
+
+@assert_no_logs
+@pytest.mark.parametrize('rule', (
+    'none',
+    'test',
+    'round round round',
+    'stretch space round',
+    'repeat test',
+))
+def test_border_image_repeat_invalid(rule):
+    assert_invalid(f'border-image-repeat: {rule}')
+
+
 @assert_no_logs
 @pytest.mark.parametrize('rule, value', (
     ('test content(text)', (('test', (('content()', 'text'),)),)),

tests/draw/__init__.py

@@ -17,6 +17,9 @@
     'G': (0, 255, 0),  # lime green
     'V': (191, 0, 64),  # average of 1*B and 3*R
     'S': (255, 63, 63),  # R above R above _
+    'C': (0, 255, 255),  # cyan
+    'M': (255, 0, 255),  # magenta
+    'Y': (255, 255, 0),  # yellow
     'K': (0, 0, 0),  # black
     'r': (255, 0, 0),  # red
     'g': (0, 128, 0),  # half green