/**
*
*/
public override object VisitAdditiveExpression([NotNull] CMMParser.AdditiveExpressionContext context)
{
Double op1, op2;
IntermediateCode code = new IntermediateCode(context.Start.Line);
// 先遍历左右子树
VisitChildren(context);
if (context.ChildCount.Equals(3))
{
// 左右
switch (context.GetChild(1).GetText())
{
case "+":
code.type = InstructionType.add;
// 计算当前表达式的值 以便万一要给数组分配大小
// op1 = (Double)expStack.Pop();
// op2 = (Double)expStack.Pop();
// expStack.Push(op2 + op1);
break;
case "-":
code.type = InstructionType.sub;
// 计算当前表达式的值 以便万一要给数组分配大小
// op1 = (Double)expStack.Pop();
// op2 = (Double)expStack.Pop();
// expStack.Push(op2 - op1);
break;
}
codes.Add(code);
}
else
{
// 子树是term的情况 不用处理
}
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="CMMParser.additiveExpression"/>.
/// <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 VisitAdditiveExpression([NotNull] CMMParser.AdditiveExpressionContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="CMMParser.additiveExpression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitAdditiveExpression([NotNull] CMMParser.AdditiveExpressionContext context)
{
}