/// <summary>
/// Visit a parse tree produced by <see cref="Sql92WhereClauseParser.literal_value"/>.
/// <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 override IFilterExpression VisitLiteral_value(Sql92WhereClauseParser.Literal_valueContext context)
{
IComparable constValue = null;
Sql92WhereClauseParser.StringLiteralContext c = context.stringLiteral();
if (c != null)
{
constValue = c.body.GetText();
}
else if (context.SIGNED_NUMBER() != null)
{
string textValue = context.GetText();
bool isFloatingPoint = textValue.Contains(".") ||
textValue.IndexOf("E", StringComparison.CurrentCultureIgnoreCase) > -1;
// ternary operator actually doesn't work here.
if (isFloatingPoint)
{
constValue = double.Parse(textValue);
}
else
{
constValue = long.Parse(textValue);
}
}
return(new ConstantExpression(constValue));
}
/// <summary>
/// Visit a parse tree produced by <see cref="Sql92WhereClauseParser.stringLiteral"/>.
/// <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 override IFilterExpression VisitStringLiteral(Sql92WhereClauseParser.StringLiteralContext context)
{
return(base.VisitStringLiteral(context));
}
