[BUGFIX] Parse calc split over multiple lines

Author: scq

src/Value/CalcFunction.php

@@ -59,10 +59,10 @@ public static function parse(ParserState $parserState, bool $ignoreCase = false)
             } else {
                 if (\in_array($parserState->peek(), $operators, true)) {
                     if (($parserState->comes('-') || $parserState->comes('+'))) {
+                        $nextChar = $parserState->peek(1, 1);
                         if (
                             $parserState->peek(1, -1) !== ' '
-                            || !($parserState->comes('- ')
-                                || $parserState->comes('+ '))
+                            || !($nextChar === ' ' || $nextChar === "\n" || $nextChar === "\r")
                         ) {
                             throw new UnexpectedTokenException(
                                 " {$parserState->peek()} ",

tests/ParserTest.php

@@ -1237,4 +1237,14 @@ public function escapedSpecialCaseTokens(): void
         self::assertInstanceOf(URL::class, $urlRule->getValue());
         self::assertInstanceOf(CalcFunction::class, $calcRule->getValue());
     }
+
+    /**
+     * @test
+     */
+    public function multilineCalc()
+    {
+        $document = self::parsedStructureForFile('multiline-calc');
+        $expected = '.btn {--foo: calc(var(--bar) + ( var(--baz) + var(--qux) ) * 2);}';
+        self::assertSame($expected, $document->render());
+    }
 }

tests/fixtures/multiline-calc.css

@@ -0,0 +1,6 @@
+.btn {
+  --foo: calc(
+    var(--bar) +
+      (var(--baz) + var(--qux)) * 2
+  );
+}