/**
* This method implements a decision point between compound-variables and
* variable-variable. It expects that the next token in the token-stream is
* of type <b>T_DOLLAR</b> and removes it from the stream. Then this method
* peeks the next available token when it is of type <b>T_CURLY_BRACE_OPEN</b>
* this is compound variable, otherwise it can be a variable-variable or a
* compound-variable.
*
* @return \PDepend\Source\AST\ASTNode
* @throws \PDepend\Source\Parser\ParserException
* @throws UnexpectedTokenException
* @since 0.9.6
*/
private function parseCompoundVariableOrVariableVariable()
{
$this->tokenStack->push();
// Read the dollar token
$token = $this->consumeToken(Tokens::T_DOLLAR);
$this->consumeComments();
// Get next token type
$tokenType = $this->tokenizer->peek();
// T_DOLLAR|T_VARIABLE === Variable variable,
// T_CURLY_BRACE_OPEN === Compound variable
switch ($tokenType) {
case Tokens::T_DOLLAR:
case Tokens::T_VARIABLE:
$variable = $this->builder->buildAstVariableVariable($token->image);
$variable->addChild($this->parseCompoundVariableOrVariableVariableOrVariable());
break;
default:
$variable = $this->parseCompoundVariable($token);
break;
}
return $this->setNodePositionsAndReturn($variable);
}
