public static QsiLiteralExpressionNode VisitConstant(ConstantContext context)
{
switch (context)
{
case StringLiteralConstantContext literalContext:
{
return(VisitLiteral(literalContext.stringLiteral()));
}
case NegativeDecimalLiteralConstantContext literalContext:
{
var literal = VisitLiteral(literalContext.decimalLiteral());
literal.Value = -(decimal)literal.Value;
return(literal);
}
case PositiveDecimalLiteralConstantContext literalContext:
{
return(VisitLiteral(literalContext.decimalLiteral()));
}
case BooleanLiteralConstantContext literalContext:
{
return(VisitLiteral(literalContext.booleanLiteral()));
}
case RealLiteralConstantContext literalContext:
{
var node = new QsiLiteralExpressionNode
{
Value = decimal.Parse(literalContext.GetText()),
Type = QsiDataType.Decimal
};
PrimarSqlTree.PutContextSpan(node, literalContext);
return(node);
}
case BitStringConstantContext _:
{
throw TreeHelper.NotSupportedFeature("Bit string");
}
case NullConstantContext _:
{
return(new QsiLiteralExpressionNode
{
Value = null,
Type = QsiDataType.Null
});
}
default:
throw TreeHelper.NotSupportedTree(context);
}
}
public static QsiLiteralExpressionNode VisitLiteral(ParserRuleContext context)
{
QsiDataType literalType;
object value;
switch (context)
{
case NullLiteralContext _:
literalType = QsiDataType.Null;
value = null;
break;
case StringLiteralContext stringLiteral:
{
value = string.Join("",
stringLiteral.STRING_LITERAL()
.Select(l => IdentifierUtility.Unescape(l.GetText())));
literalType = QsiDataType.String;
break;
}
case DecimalLiteralContext _:
literalType = QsiDataType.Decimal;
value = decimal.Parse(context.GetText());
break;
case BooleanLiteralContext _:
literalType = QsiDataType.Boolean;
value = bool.Parse(context.GetText());
break;
default:
throw TreeHelper.NotSupportedTree(context);
}
var node = new QsiLiteralExpressionNode
{
Value = value,
Type = literalType
};
PrimarSqlTree.PutContextSpan(node, context);
return(node);
}
