private void ProcessIfStatement(NodeBase statement)
{
Queue <NodeBase> children = GetChildren(statement);
Expect(children.Dequeue(), NodeType.Keyword, "if");
Expect(children.Dequeue(), NodeType.Symbol, "(");
ProcessExpression(children.Dequeue());
int ifStatementNumber = vmWriter.GetIfStatementNumber();
vmWriter.IfStart(ifStatementNumber);
Expect(children.Dequeue(), NodeType.Symbol, ")");
Expect(children.Dequeue(), NodeType.Symbol, "{");
ProcessStatements(children.Dequeue());
Expect(children.Dequeue(), NodeType.Symbol, "}");
if (PeekType(children) == NodeType.Keyword && PeekValue(children) == "else")
{
vmWriter.IfElse(ifStatementNumber);
Expect(children.Dequeue(), NodeType.Keyword, "else");
Expect(children.Dequeue(), NodeType.Symbol, "{");
ProcessStatements(children.Dequeue());
Expect(children.Dequeue(), NodeType.Symbol, "}");
vmWriter.IfElseEnd(ifStatementNumber);
}
else
{
vmWriter.IfEnd(ifStatementNumber);
}
}