public override Expression VisitLiteral([NotNull] RuleEngineParser.LiteralContext context)
{
var booleanLiteralContext = context.booleanLiteral();
if (booleanLiteralContext != null)
{
return(VisitBooleanLiteral(booleanLiteralContext));
}
var stringLiteralContext = context.stringLiteral();
if (stringLiteralContext != null)
{
return(VisitStringLiteral(stringLiteralContext));
}
var terminalNode = context.INTEGER_LITERAL();
if (terminalNode != null)
{
var value = ulong.Parse(terminalNode.GetText());
if (value <= int.MaxValue)
{
return(Expression.Constant((int)value));
}
else
{
return(Expression.Constant(value));
}
}
terminalNode = context.REAL_LITERAL();
if (terminalNode != null)
{
var value = decimal.Parse(terminalNode.GetText());
return(Expression.Constant(value));
}
terminalNode = context.CHARACTER_LITERAL();
if (terminalNode != null)
{
var value = terminalNode.GetText();
if (value.Length > 1)
{
return(Expression.Constant(value));
}
else if (value.Length == 1)
{
return(Expression.Constant(value[0]));
}
else
{
throw new NotSupportedException("Not support '' value.");
}
}
return(Expression.Constant(null));
}
/// <summary>
/// Visit a parse tree produced by <see cref="RuleEngineParser.literal"/>.
/// <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 VisitLiteral([NotNull] RuleEngineParser.LiteralContext context)
{
return(VisitChildren(context));
}
