Use CSSFunction for Microsoft old-style filter

Tested on down to IE8 and confirmed that string arguments can be
wrapped in single quotes, double quotes, or nothing.

Author: Frederic Massart

lib/Sabberworm/CSS/Parser.php

@@ -19,7 +19,6 @@
 use Sabberworm\CSS\Value\Color;
 use Sabberworm\CSS\Value\URL;
 use Sabberworm\CSS\Value\CSSString;
-use Sabberworm\CSS\Value\Statement;
 use Sabberworm\CSS\Rule\Rule;
 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 use Sabberworm\CSS\Comment\Comment;
@@ -437,7 +436,7 @@ private function parsePrimitiveValue() {
 			$oValue = $this->parseURLValue();
 		} else if ($this->comes("'") || $this->comes('"')) {
 			$oValue = $this->parseStringValue();
-		} else if ($this->comes("progid:")) {
+		} else if ($this->comes("progid:") && $this->oParserSettings->bLenientParsing) {
 			$oValue = $this->parseMicrosoftFilter();
 		} else {
 			$oValue = $this->parseIdentifier(true, false);
@@ -500,8 +499,9 @@ private function parseColorValue() {
 	}
 
 	private function parseMicrosoftFilter() {
-		$sStatement = $this->consumeUntil(')', true, true);
-		return new Statement($sStatement, $this->iLineNo);
+		$sFunction = $this->consumeUntil('(', false, true);
+		$aArguments = $this->parseValue(array(',', '='));
+		return new CSSFunction($sFunction, $aArguments, ',', $this->iLineNo);
 	}
 
 	private function parseURLValue() {

lib/Sabberworm/CSS/Value/Statement.php

@@ -583,9 +583,16 @@ function testTopLevelCommentExtracting() {
 		$this->assertEquals("Find Me!", $comments[0]->getComment());
 	}
 
+	/**
+	* @expectedException Sabberworm\CSS\Parsing\UnexpectedTokenException
+	*/
+	function testMicrosoftFilterStrictParsing() {
+		$oDoc = $this->parsedStructureForFile('ms-filter', Settings::create()->beStrict());
+	}
+
 	function testMicrosoftFilterParsing() {
 		$oDoc = $this->parsedStructureForFile('ms-filter');
-		$sExpected = ".test {filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#80000000', endColorstr='#00000000', GradientType=1);}";
+		$sExpected = ".test {filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=\"#80000000\",endColorstr=\"#00000000\",GradientType=1);}";
 		$this->assertSame($sExpected, $oDoc->render());
 	}
 }