public static FieldExpr ReadColumn(LexemCollection collection)
{
if (collection.CurrentLexem() == null)
{
throw new Exception("Alias not found");
}
if (collection.CurrentLexem().LexemType == LexType.Command)
{
var r = collection.CurrentLexem().LexemText;
FieldExpr fc = new FieldExpr();
fc.FieldName = collection.CurrentLexem().LexemText;
return(fc);
}
if (collection.CurrentLexem().LexemType == LexType.Text)
{
var strs = ParserUtils.ParseStringQuote(collection.CurrentLexem().LexemText);
if (strs.Length != 1)
{
collection.Error("Composite column name", collection.CurrentLexem());
}
FieldExpr fc = new FieldExpr();
fc.FieldName = strs[0];
return(fc);
}
collection.Error("Column not found", collection.CurrentLexem());
return(null);
}
public static string ReadAlias(LexemCollection collection)
{
if (collection.CurrentLexem() == null)
{
throw new Exception("Alias not found");
}
string[] strs = null;
if (collection.CurrentLexem().LexemType == LexType.Command)
{
var r = collection.CurrentLexem().LexemText;
strs = ParserUtils.ParseStringQuote(r);
}
else
if (collection.CurrentLexem().LexemType == LexType.Text)
{
strs = ParserUtils.ParseStringQuote(collection.CurrentLexem().LexemText);
}
if (strs != null)
{
if (strs.Length > 1)
{
collection.Error("Composite alias", collection.CurrentLexem());
}
return(strs[0]);
}
collection.Error("Alias not found", collection.CurrentLexem());
return(null);
}
public Expression GetNode(ExpressionParser parser)
{
Lexem lex = parser.Collection.CurrentLexem();
Expression res = null;
if (lex.LexemType == LexType.Text || lex.LexemType == LexType.Command)
{
string[] names = ParserUtils.ParseStringQuote(lex.LexemText);
res = SqlOnlyFactory.AddFiled(names, lex, parser);
}
return(res);
}
public static string[] ReadTableName(LexemCollection collection)
{
if (collection.CurrentLexem() == null)
{
throw new Exception("Alias not found");
}
if (collection.CurrentLexem().LexemType == LexType.Command)
{
var r = collection.CurrentLexem().LexemText;
return(ParserUtils.ParseStringQuote(r));
}
if (collection.CurrentLexem().LexemType == LexType.Text)
{
var strs = ParserUtils.ParseStringQuote(collection.CurrentLexem().LexemText);
return(strs);
}
collection.Error("Alias not found", collection.CurrentLexem());
return(null);
}
/// <summary>
/// Читаем название колонки в текущей лексеме. Может быть name, "name", [name]
/// </summary>
/// <param name="collection"></param>
/// <returns></returns>
public static string ReadColumnNameOnly(LexemCollection collection)
{
if (collection.CurrentLexem() == null)
{
collection.Error("Alias not found", collection.CurrentOrLast());
}
if (collection.CurrentLexem().LexemType == LexType.Command)
{
var r = collection.CurrentLexem().LexemText;
return(r);
}
if (collection.CurrentLexem().LexemType == LexType.Text)
{
var strs = ParserUtils.ParseStringQuote(collection.CurrentLexem().LexemText);
if (strs.Length != 1)
{
collection.Error("Composite column name", collection.CurrentLexem());
}
return(strs[0]);
}
collection.Error("Column not found", collection.CurrentLexem());
return(null);
}