Trying to replace expression (Expr_FuncCall) with statement (Stmt_Echo)

[splitbrain]

I'm trying to write my first own rector class but I'm having trouble. I want to replace a function call with a echo statement. My previous function took two arguments, the replacement should only use the first.

Below is what I tried. According to the error message mentioned in the title, I can not replace an expression with a statement. How do I convert the statement into an expression?

class PtlnRector extends AbstractRector
{

    /** @inheritdoc */
    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition('Replace ptln() calls with echo', [
            new CodeSample(
                <<<'CODE_SAMPLE'
ptln('Hello World', 7);
CODE_SAMPLE,
                <<<'CODE_SAMPLE'
echo 'Hello World';
CODE_SAMPLE
            ),
        ]);
    }

    /** @inheritdoc */
    public function getNodeTypes(): array
    {
        return [FuncCall::class];
    }

    /** @inheritdoc */
    public function refactor(Node $node)
    {
        if (!$this->isName($node, 'ptln')) return null;

        return new Echo_([
            $node->args[0]->value
        ]);
    }
}

[samsonasik]

You need to replace whole Expresssion for that:

First, define the node types as Expression stmt:

    public function getNodeTypes(): array
    {
        return [\PhpParser\Node\Stmt\Expression::class];
    }

Next, verify if the node expr is match with FuncCall

    /**
     * @param \PhpParser\Node\Stmt\Expression $node
     */
    public function refactor(Node $node): ?Node
    {
        if (! $node->expr instanceof \PhpParser\Node\Expr\FuncCall) {
            return null;
        }

        if (! $this->nodeNameResolver->isName($node->expr, 'ptln')) {
            return null;
        }

         // here replace with Echo_
         return new Echo_([
            $node->expr->args[0]->value
        ]);
    }

Above is pseudo code, but you have the idea :)

[splitbrain]

Works! Thanks a lot!