Improve scientific notation parsing

Author: raxbg

lib/Sabberworm/CSS/Value/Size.php

@@ -28,11 +28,16 @@ public static function parse(ParserState $oParserState, $bIsColorComponent = fal
 		if ($oParserState->comes('-')) {
 			$sSize .= $oParserState->consume('-');
 		}
-		while (is_numeric($oParserState->peek()) || $oParserState->comes('.') || $oParserState->comes('e+', true) || $oParserState->comes('e-', true)) {
+		while (is_numeric($oParserState->peek()) || $oParserState->comes('.') || $oParserState->comes('e', true)) {
 			if ($oParserState->comes('.')) {
 				$sSize .= $oParserState->consume('.');
 			} else if ($oParserState->comes('e', true)) {
-				$sSize .= $oParserState->consume(2);
+				$sLookahead = $oParserState->peek(1, 1);
+				if (is_numeric($sLookahead) || $sLookahead === '+' || $sLookahead === '-') {
+					$sSize .= $oParserState->consume(2);
+				} else {
+					break; // Reached the unit part of the number like "em" or "ex"
+				}
 			} else {
 				$sSize .= $oParserState->consume(1);
 			}

tests/Sabberworm/CSS/ParserTest.php

@@ -763,7 +763,7 @@ function testLargeSizeValuesInFile() {
 
 	function testScientificNotationSizeValuesInFile() {
 		$oDoc = $this->parsedStructureForFile('scientific-notation-numbers', Settings::create()->withMultibyteSupport(false));
-		$sExpected = 'body {background-color: rgba(62,174,151,3041820656523200167936);z-index: .030418206565232;}';
+		$sExpected = 'body {background-color: rgba(62,174,151,3041820656523200167936);z-index: .030418206565232;font-size: 1em;top: 192.3478px;}';
 		$this->assertSame($sExpected, $oDoc->render());
 	}
 

tests/files/scientific-notation-numbers.css

@@ -1,4 +1,6 @@
 body {
   background-color: rgba(62,174,151,3.0418206565232E+21);
-  z-index: 3.0418206565232E-2
+  z-index: 3.0418206565232E-2;
+  font-size: 1em;
+  top: 1.923478e2px;
 }