/**
* Parses a mandatory array index expression.
*
* <code>
* // ---
* $string{0};
* // ---
* </code>
*
* @param \PDepend\Source\AST\ASTNode $node The context source node.
*
* @return \PDepend\Source\AST\ASTStringIndexExpression
* @since 0.9.12
*/
private function parseStringIndexExpression(ASTNode $node)
{
$expr = $this->builder->buildAstStringIndexExpression();
$expr->addChild($node);
return $this->parseIndexExpression($node, $expr, Tokens::T_CURLY_BRACE_OPEN, Tokens::T_CURLY_BRACE_CLOSE);
}
