public override ParserRuleContext VisitCompareExpr([NotNull] StructuredTextParser.CompareExprContext context)
{
//TODO: 演算の優先度調節
var result = Visit(context.lhs);
_contextStack.Push(result);
for (int i = 1; i < context.ChildCount; i += 2)
{
var operand = context.GetChild <ITerminalNode>(i).Symbol;
int type;
switch (operand.Type)
{
case StructuredTextParser.EQ: type = VisualBasicParser.EQ; break;
case StructuredTextParser.NEQ: type = VisualBasicParser.NEQ; break;
default: throw new InvalidOperationException();
}
result.AddChild(new CommonToken(type, operand.Text));
result.AddChild(Visit(context.GetChild(i + 1)));
}
_contextStack.Pop();
return(result);
}
/// <summary>
/// Visit a parse tree produced by <see cref="StructuredTextParser.compareExpr"/>.
/// <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 VisitCompareExpr([NotNull] StructuredTextParser.CompareExprContext context)
{
return(VisitChildren(context));
}