public override SqlObject VisitLiteralScalarExpression(AntlrSqlParser.LiteralScalarExpressionContext context)
{
Contract.Requires(context != null);
Contract.Requires(context.ChildCount == 1);
Contract.Requires(context.children[0].ChildCount == 1);
TerminalNodeImpl terminalNode = (TerminalNodeImpl)context.children[0].GetChild(0);
SqlLiteralScalarExpression sqlLiteralScalarExpression;
switch (terminalNode.Symbol.Type)
{
case AntlrSqlParser.STRING_LITERAL:
string value = CstToAstVisitor.GetStringValueFromNode(terminalNode);
sqlLiteralScalarExpression = SqlLiteralScalarExpression.Create(SqlStringLiteral.Create(value));
break;
case AntlrSqlParser.NUMERIC_LITERAL:
Number64 number64 = CstToAstVisitor.GetNumber64ValueFromNode(terminalNode);
sqlLiteralScalarExpression = SqlLiteralScalarExpression.Create(SqlNumberLiteral.Create(number64));
break;
case AntlrSqlParser.K_TRUE:
sqlLiteralScalarExpression = SqlLiteralScalarExpression.Create(SqlBooleanLiteral.Create(true));
break;
case AntlrSqlParser.K_FALSE:
sqlLiteralScalarExpression = SqlLiteralScalarExpression.Create(SqlBooleanLiteral.Create(false));
break;
case AntlrSqlParser.K_NULL:
sqlLiteralScalarExpression = SqlLiteralScalarExpression.Create(SqlNullLiteral.Create());
break;
case AntlrSqlParser.K_UNDEFINED:
sqlLiteralScalarExpression = SqlLiteralScalarExpression.Create(SqlUndefinedLiteral.Create());
break;
default:
throw new ArgumentOutOfRangeException($"Unknown symbol type: {terminalNode.Symbol.Type}");
}
return(sqlLiteralScalarExpression);
}
/// <summary>
/// Visit a parse tree produced by the <c>LiteralScalarExpression</c>
/// labeled alternative in <see cref="AntlrSqlParser.scalar_expression"/>.
/// <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 VisitLiteralScalarExpression([NotNull] AntlrSqlParser.LiteralScalarExpressionContext context)
{
return(VisitChildren(context));
}
