bug #4731 Fix spread operator behavior (fabpot)

This PR was merged into the 3.x branch.

Discussion
----------

Fix spread operator behavior

Closes #4637

Commits
-------

2376bbaf3e Fix spread operator behavior

src/ExpressionParser/Prefix/UnaryOperatorExpressionParser.php

@@ -33,6 +33,7 @@ final class UnaryOperatorExpressionParser extends AbstractExpressionParser imple
         private ?PrecedenceChange $precedenceChange = null,
         private ?string $description = null,
         private array $aliases = [],
+        private ?int $operandPrecedence = null,
     ) {
     }
 
@@ -41,7 +42,7 @@ final class UnaryOperatorExpressionParser extends AbstractExpressionParser imple
      */
     public function parse(Parser $parser, Token $token): AbstractExpression
     {
-        return new ($this->nodeClass)($parser->parseExpression($this->precedence), $token->getLine());
+        return new ($this->nodeClass)($parser->parseExpression($this->operandPrecedence ?? $this->precedence), $token->getLine());
     }
 
     public function getName(): string

src/Extension/CoreExtension.php

@@ -333,7 +333,7 @@ final class CoreExtension extends AbstractExtension
         return [
             // unary operators
             new UnaryOperatorExpressionParser(NotUnary::class, 'not', 50, new PrecedenceChange('twig/twig', '3.15', 70)),
-            new UnaryOperatorExpressionParser(SpreadUnary::class, '...', 512, description: 'Spread operator'),
+            new UnaryOperatorExpressionParser(SpreadUnary::class, '...', 512, description: 'Spread operator', operandPrecedence: 0),
             new UnaryOperatorExpressionParser(NegUnary::class, '-', 500),
             new UnaryOperatorExpressionParser(PosUnary::class, '+', 500),
 

tests/Fixtures/expressions/spread_ternary_precedence.test

@@ -0,0 +1,14 @@
+--TEST--
+Twig spread operator precedence with ternary operator
+--TEMPLATE--
+{{ [...true ? ['a'] : ['b']]|join }}
+{{ [...false ? ['a'] : ['b']]|join }}
+{{ [...(true ? ['a'] : ['b'])]|join }}
+{{ {a: 1, ...true ? {b: 2} : {c: 3}}|keys|join(',') }}
+--DATA--
+return []
+--EXPECT--
+a
+b
+a
+a,b