/*
* 写指令
*/
public override object VisitWriteStatement([NotNull] CMMParser.WriteStatementContext context)
{
IntermediateCode code;
if (context.ChildCount == 4)
{
// write不带参数
code = new IntermediateCode(0, InstructionType.write, context.Start.Line);
}
else
{
// write带参数 先访问参数 将其压栈
VisitChildren(context);
// 打印栈顶元素
code = new IntermediateCode(1, InstructionType.write, context.Start.Line);
}
codes.Add(code);
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="CMMParser.writeStatement"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitWriteStatement([NotNull] CMMParser.WriteStatementContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="CMMParser.writeStatement"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitWriteStatement([NotNull] CMMParser.WriteStatementContext context)
{
}