CSSJanusTest.php

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<?php
class CSSJanusTest extends MediaWikiTestCase {
    public function testTransform( $cssA, $cssB = null ) {

        if ( $cssB ) {
            $transformedA = CSSJanus::transform( $cssA );
            $this->assertEquals( $transformedA, $cssB, 'Test A-B transformation' );

            $transformedB = CSSJanus::transform( $cssB );
            $this->assertEquals( $transformedB, $cssA, 'Test B-A transformation' );
        } else {
            // If no B version is provided, it means
            // the output should equal the input.
            $transformedA = CSSJanus::transform( $cssA );
            $this->assertEquals( $transformedA, $cssA, 'Nothing was flipped' );
        }
    }

    public function testTransformAdvanced( $code, $expectedOutput, $options = array() ) {
        $swapLtrRtlInURL = isset( $options['swapLtrRtlInURL'] ) ? $options['swapLtrRtlInURL'] : false;
        $swapLeftRightInURL = isset( $options['swapLeftRightInURL'] ) ? $options['swapLeftRightInURL'] : false;

        $flipped = CSSJanus::transform( $code, $swapLtrRtlInURL, $swapLeftRightInURL );

        $this->assertEquals( $expectedOutput, $flipped,
            'Test flipping, options: url-ltr-rtl=' . ( $swapLtrRtlInURL ? 'true' : 'false' )
                . ' url-left-right=' . ( $swapLeftRightInURL ? 'true' : 'false' )
        );
    }

    public function testTransformBroken( $code, $expectedOutput ) {
        $flipped = CSSJanus::transform( $code );

        $this->assertEquals( $expectedOutput, $flipped, 'Test flipping' );
    }

    public static function provideTransformCases() {
        return array(
            // Property keys
            array(
                '.foo { left: 0; }',
                '.foo { right: 0; }'
            ),
            // Guard against partial keys
            // (CSS currently doesn't have flippable properties
            // that contain the direction as part of the key without
            // dash separation)
            array(
                '.foo { alright: 0; }'
            ),
            array(
                '.foo { balleft: 0; }'
            ),

            // Dashed property keys
            array(
                '.foo { padding-left: 0; }',
                '.foo { padding-right: 0; }'
            ),
            array(
                '.foo { margin-left: 0; }',
                '.foo { margin-right: 0; }'
            ),
            array(
                '.foo { border-left: 0; }',
                '.foo { border-right: 0; }'
            ),

            // Double-dashed property keys
            array(
                '.foo { border-left-color: red; }',
                '.foo { border-right-color: red; }'
            ),
            array(
                // Includes unknown properties?
                '.foo { x-left-y: 0; }',
                '.foo { x-right-y: 0; }'
            ),

            // Multi-value properties
            array(
                '.foo { padding: 0; }'
            ),
            array(
                '.foo { padding: 0 1px; }'
            ),
            array(
                '.foo { padding: 0 1px 2px; }'
            ),
            array(
                '.foo { padding: 0 1px 2px 3px; }',
                '.foo { padding: 0 3px 2px 1px; }'
            ),

            // Shorthand / Four notation
            array(
                '.foo { padding: .25em 15px 0pt 0ex; }',
                '.foo { padding: .25em 0ex 0pt 15px; }'
            ),
            array(
                '.foo { margin: 1px -4px 3px 2px; }',
                '.foo { margin: 1px 2px 3px -4px; }'
            ),
            array(
                '.foo { padding: 0 15px .25em 0; }',
                '.foo { padding: 0 0 .25em 15px; }'
            ),
            array(
                '.foo { padding: 1px 4.1grad 3px 2%; }',
                '.foo { padding: 1px 2% 3px 4.1grad; }'
            ),
            array(
                '.foo { padding: 1px 2px 3px auto; }',
                '.foo { padding: 1px auto 3px 2px; }'
            ),
            array(
                '.foo { padding: 1px inherit 3px auto; }',
                '.foo { padding: 1px auto 3px inherit; }'
            ),
            // border-radius assigns different meanings to the values
            array(
                '.foo { border-radius: .25em 15px 0pt 0ex; }',
                '.foo { border-radius: 15px .25em 0ex 0pt; }'
            ),
            array(
                '.foo { border-radius: 0px 0px 5px 5px; }',
            ),
            // Ensure the rule doesn't break other stuff
            array(
                '.foo { x-unknown: a b c d; }'
            ),
            array(
                '.foo barpx 0 2% { opacity: 0; }'
            ),
            array(
                '#settings td p strong'
            ),
            array(
                // Color names
                '.foo { border-color: red green blue white }',
                '.foo { border-color: red white blue green }',
            ),
            array(
                // Color name, hexdecimal, RGB & RGBA
                '.foo { border-color: red #f00 rgb(255, 0, 0) rgba(255, 0, 0, 0.5) }',
                '.foo { border-color: red rgba(255, 0, 0, 0.5) rgb(255, 0, 0) #f00 }',
            ),
            array(
                // Color name, hexdecimal, HSL & HSLA
                '.foo { border-color: red #f00 hsl(0, 100%, 50%) hsla(0, 100%, 50%, 0.5) }',
                '.foo { border-color: red hsla(0, 100%, 50%, 0.5) hsl(0, 100%, 50%) #f00 }',
            ),
            array(
                // Do not mangle 5 or more values
                '.foo { -x-unknown: 1 2 3 4 5; }'
            ),
            array(
                '.foo { -x-unknown: 1 2 3 4 5 6; }'
            ),

            // Shorthand / Three notation
            array(
                '.foo { margin: 1em 0 .25em; }'
            ),
            array(
                '.foo { margin:-1.5em 0 -.75em; }'
            ),

            // Shorthand / Two notation
            array(
                '.foo { padding: 1px 2px; }'
            ),

            // Shorthand / One notation
            array(
                '.foo { padding: 1px; }'
            ),

            // text-shadow and box-shadow
            array(
                '.foo { box-shadow: -6px 3px 8px 5px rgba(0, 0, 0, 0.25); }',
                '.foo { box-shadow: 6px 3px 8px 5px rgba(0, 0, 0, 0.25); }',
            ),
            array(
                '.foo { box-shadow: inset -6px 3px 8px 5px rgba(0, 0, 0, 0.25); }',
                '.foo { box-shadow: inset 6px 3px 8px 5px rgba(0, 0, 0, 0.25); }',
            ),
            array(
                '.foo { text-shadow: orange 2px 0; }',
                '.foo { text-shadow: orange -2px 0; }',
            ),
            array(
                '.foo { text-shadow: 2px 0 orange; }',
                '.foo { text-shadow: -2px 0 orange; }',
            ),
            array(
                // Don't mangle zeroes
                '.foo { text-shadow: orange 0 2px; }'
            ),

            // Direction
            // Note: This differs from the Python implementation,
            // see also CSSJanus::fixDirection for more info.
            array(
                '.foo { direction: ltr; }',
                '.foo { direction: rtl; }'
            ),
            array(
                '.foo { direction: rtl; }',
                '.foo { direction: ltr; }'
            ),
            array(
                'input { direction: ltr; }',
                'input { direction: rtl; }'
            ),
            array(
                'input { direction: rtl; }',
                'input { direction: ltr; }'
            ),
            array(
                'body { direction: ltr; }',
                'body { direction: rtl; }'
            ),
            array(
                '.foo, body, input { direction: ltr; }',
                '.foo, body, input { direction: rtl; }'
            ),
            array(
                'body { padding: 10px; direction: ltr; }',
                'body { padding: 10px; direction: rtl; }'
            ),
            array(
                'body { direction: ltr } .myClass { direction: ltr }',
                'body { direction: rtl } .myClass { direction: rtl }'
            ),

            // Left/right values
            array(
                '.foo { float: left; }',
                '.foo { float: right; }'
            ),
            array(
                '.foo { text-align: left; }',
                '.foo { text-align: right; }'
            ),
            array(
                '.foo { -x-unknown: left; }',
                '.foo { -x-unknown: right; }'
            ),
            // Guard against selectors that look flippable
            array(
                '.column-left { width: 0; }'
            ),
            array(
                'a.left { width: 0; }'
            ),
            array(
                'a.leftification { width: 0; }'
            ),
            array(
                'a.ltr { width: 0; }'
            ),
            array(
                # <div class="a-ltr png">
                '.a-ltr.png { width: 0; }'
            ),
            array(
                # <foo-ltr attr="x">
                'foo-ltr[attr="x"] { width: 0; }'
            ),
            array(
                'div.left > span.right+span.left { width: 0; }'
            ),
            array(
                '.thisclass .left .myclass { width: 0; }'
            ),
            array(
                '.thisclass .left .myclass #myid { width: 0; }'
            ),

            // Cursor values (east/west)
            array(
                '.foo { cursor: e-resize; }',
                '.foo { cursor: w-resize; }'
            ),
            array(
                '.foo { cursor: se-resize; }',
                '.foo { cursor: sw-resize; }'
            ),
            array(
                '.foo { cursor: ne-resize; }',
                '.foo { cursor: nw-resize; }'
            ),

            // Background
            array(
                '.foo { background-position: top left; }',
                '.foo { background-position: top right; }'
            ),
            array(
                '.foo { background: url(/foo/bar.png) top left; }',
                '.foo { background: url(/foo/bar.png) top right; }'
            ),
            array(
                '.foo { background: url(/foo/bar.png) top left no-repeat; }',
                '.foo { background: url(/foo/bar.png) top right no-repeat; }'
            ),
            array(
                '.foo { background: url(/foo/bar.png) no-repeat top left; }',
                '.foo { background: url(/foo/bar.png) no-repeat top right; }'
            ),
            array(
                '.foo { background: #fff url(/foo/bar.png) no-repeat top left; }',
                '.foo { background: #fff url(/foo/bar.png) no-repeat top right; }'
            ),
            array(
                '.foo { background-position: 100% 40%; }',
                '.foo { background-position: 0% 40%; }'
            ),
            array(
                '.foo { background-position: 23% 0; }',
                '.foo { background-position: 77% 0; }'
            ),
            array(
                '.foo { background-position: 23% auto; }',
                '.foo { background-position: 77% auto; }'
            ),
            array(
                '.foo { background-position-x: 23%; }',
                '.foo { background-position-x: 77%; }'
            ),
            array(
                '.foo { background-position-y: 23%; }',
                '.foo { background-position-y: 23%; }'
            ),
            array(
                '.foo { background:url(../foo.png) no-repeat 75% 50%; }',
                '.foo { background:url(../foo.png) no-repeat 25% 50%; }'
            ),
            array(
                '.foo { background: 10% 20% } .bar { background: 40% 30% }',
                '.foo { background: 90% 20% } .bar { background: 60% 30% }'
            ),

            // Multiple rules
            array(
                'body { direction: rtl; float: right; } .foo { direction: ltr; float: right; }',
                'body { direction: ltr; float: left; } .foo { direction: rtl; float: left; }',
            ),

            // Duplicate properties
            array(
                '.foo { float: left; float: right; float: left; }',
                '.foo { float: right; float: left; float: right; }',
            ),

            // Preserve comments
            array(
                '/* left /* right */left: 10px',
                '/* left /* right */right: 10px'
            ),
            array(
                '/*left*//*left*/left: 10px',
                '/*left*//*left*/right: 10px'
            ),
            array(
                '/* Going right is cool */ .foo { width: 0 }',
            ),
            array(
                "/* padding-right 1 2 3 4 */\n#test { width: 0}\n/*right*/"
            ),
            array(
                "/** Two line comment\n * left\n \*/\n#test {width: 0}"
            ),

            // @noflip annotation
            array(
                // before selector (single)
                '/* @noflip */ div { float: left; }'
            ),
            array(
                // before selector (multiple)
                '/* @noflip */ div, .notme { float: left; }'
            ),
            array(
                // inside selector
                'div, /* @noflip */ .foo { float: left; }'
            ),
            array(
                // after selector
                'div, .notme /* @noflip */ { float: left; }'
            ),
            array(
                // before multiple rules
                '/* @noflip */ div { float: left; } .foo { float: left; }',
                '/* @noflip */ div { float: left; } .foo { float: right; }'
            ),
            array(
                // support parentheses in selector
                '/* @noflip */ .test:not(:first) { margin-right: -0.25em; margin-left: 0.25em; }',
                '/* @noflip */ .test:not(:first) { margin-right: -0.25em; margin-left: 0.25em; }'
            ),
            array(
                // after multiple rules
                '.foo { float: left; } /* @noflip */ div { float: left; }',
                '.foo { float: right; } /* @noflip */ div { float: left; }'
            ),
            array(
                // before multiple properties
                'div { /* @noflip */ float: left; text-align: left; }',
                'div { /* @noflip */ float: left; text-align: right; }'
            ),
            array(
                // after multiple properties
                'div { float: left; /* @noflip */ text-align: left; }',
                'div { float: right; /* @noflip */ text-align: left; }'
            ),

            // Guard against css3 stuff
            array(
                'background-image: -moz-linear-gradient(#326cc1, #234e8c);'
            ),
            array(
                'background-image: -webkit-gradient(linear, 100% 0%, 0% 0%, from(#666666), to(#ffffff));'
            ),

            // CSS syntax / white-space variations
            // spaces, no spaces, tabs, new lines, omitting semi-colons
            array(
                ".foo { left: 0; }",
                ".foo { right: 0; }"
            ),
            array(
                ".foo{ left: 0; }",
                ".foo{ right: 0; }"
            ),
            array(
                ".foo{ left: 0 }",
                ".foo{ right: 0 }"
            ),
            array(
                ".foo{left:0 }",
                ".foo{right:0 }"
            ),
            array(
                ".foo{left:0}",
                ".foo{right:0}"
            ),
            array(
                ".foo  {  left : 0 ; }",
                ".foo  {  right : 0 ; }"
            ),
            array(
                ".foo\n  {  left : 0 ; }",
                ".foo\n  {  right : 0 ; }"
            ),
            array(
                ".foo\n  {  \nleft : 0 ; }",
                ".foo\n  {  \nright : 0 ; }"
            ),
            array(
                ".foo\n  { \n left : 0 ; }",
                ".foo\n  { \n right : 0 ; }"
            ),
            array(
                ".foo\n  { \n left\n  : 0; }",
                ".foo\n  { \n right\n  : 0; }"
            ),
            array(
                ".foo \n  { \n left\n  : 0; }",
                ".foo \n  { \n right\n  : 0; }"
            ),
            array(
                ".foo\n{\nleft\n:\n0;}",
                ".foo\n{\nright\n:\n0;}"
            ),
            array(
                ".foo\n.bar {\n\tleft: 0;\n}",
                ".foo\n.bar {\n\tright: 0;\n}"
            ),
            array(
                ".foo\t{\tleft\t:\t0;}",
                ".foo\t{\tright\t:\t0;}"
            ),

            // Guard against partial keys
            array(
                '.foo { leftxx: 0; }',
                '.foo { leftxx: 0; }'
            ),
            array(
                '.foo { rightxx: 0; }',
                '.foo { rightxx: 0; }'
            ),
        );
    }

    public static function provideTransformAdvancedCases() {
        $bgPairs = array(
            # [ - _ . ] <-> [ left right ltr rtl ]
            'foo.jpg' => 'foo.jpg',
            'left.jpg' => 'right.jpg',
            'ltr.jpg' => 'rtl.jpg',

            'foo-left.png' => 'foo-right.png',
            'foo_left.png' => 'foo_right.png',
            'foo.left.png' => 'foo.right.png',

            'foo-ltr.png' => 'foo-rtl.png',
            'foo_ltr.png' => 'foo_rtl.png',
            'foo.ltr.png' => 'foo.rtl.png',

            'left-foo.png' => 'right-foo.png',
            'left_foo.png' => 'right_foo.png',
            'left.foo.png' => 'right.foo.png',

            'ltr-foo.png' => 'rtl-foo.png',
            'ltr_foo.png' => 'rtl_foo.png',
            'ltr.foo.png' => 'rtl.foo.png',

            'foo-ltr-left.gif' => 'foo-rtl-right.gif',
            'foo_ltr_left.gif' => 'foo_rtl_right.gif',
            'foo.ltr.left.gif' => 'foo.rtl.right.gif',
            'foo-ltr_left.gif' => 'foo-rtl_right.gif',
            'foo_ltr.left.gif' => 'foo_rtl.right.gif',
        );
        $provider = array();
        foreach ( $bgPairs as $left => $right ) {
            # By default '-rtl' and '-left' etc. are not touched,
            # Only when the appropiate parameter is set.
            $provider[] = array(
                ".foo { background: url(images/$left); }",
                ".foo { background: url(images/$left); }"
            );
            $provider[] = array(
                ".foo { background: url(images/$right); }",
                ".foo { background: url(images/$right); }"
            );
            $provider[] = array(
                ".foo { background: url(images/$left); }",
                ".foo { background: url(images/$right); }",
                array(
                    'swapLtrRtlInURL' => true,
                    'swapLeftRightInURL' => true,
                )
            );
            $provider[] = array(
                ".foo { background: url(images/$right); }",
                ".foo { background: url(images/$left); }",
                array(
                    'swapLtrRtlInURL' => true,
                    'swapLeftRightInURL' => true,
                )
            );
        }

        return $provider;
    }

    public static function provideTransformBrokenCases() {
        return array(
            // Guard against selectors that look flippable
            array(
                # <foo-left-x attr="x">
                'foo-left-x[attr="x"] { width: 0; }',
                'foo-left-x[attr="x"] { width: 0; }'
            ),
            array(
                # <div class="foo" data-left="x">
                '.foo[data-left="x"] { width: 0; }',
                '.foo[data-left="x"] { width: 0; }'
            ),
        );
    }
}