// ECMA-262 14.4 Yield expression
public Node parseYieldExpression()
{
Node argument;
Node expr;
bool @delegate = false;
bool previousAllowYield;
argument = null;
expr = new Node();
expectKeyword("yield");
if (!hasLineTerminator)
{
previousAllowYield = state.allowYield;
state.allowYield = false;
@delegate = match("*");
if (@delegate)
{
lex();
argument = parseAssignmentExpression();
}
else
{
if (!match(";") && !match("}") && !match(")") && lookahead.type != TokenType.EOF)
{
argument = parseAssignmentExpression();
}
}
state.allowYield = previousAllowYield;
}
return expr.finishYieldExpression(argument, @delegate);
}