private static string ColumnName(SqlNode[] segment, int start, int i)
{
if (i >= (start + 2) && segment[start + 1].TextEquals("=") && segment[start] is SqlLiteral)
{
var lastNode = segment[start] as SqlLiteral;
if (lastNode != null && lastNode.Type == SqlType.Identifier)
return lastNode.Text;
}
else
{
var lastNode = LastNonCommentNode(segment.Skip(start).Take(i - start)).LastNonCommentNode() as SqlLiteral;
if (lastNode != null && lastNode.TextEquals("*"))
{
var idx = Array.IndexOf(segment, lastNode, start);
if (idx > start && segment[idx - 1] is SqlName)
{
return (segment[idx - 1] as SqlName).FullName + "." + lastNode.Text;
}
else
{
return lastNode.Text;
}
}
else if (lastNode != null && lastNode.Type == SqlType.Identifier)
{
return lastNode.Text;
}
}
return null;
}
int ISqlGroupNode.IndexOf(SqlNode node)
{
var ofType = node as T;
if (ofType == null)
{
return(-1);
}
return(_nodes.IndexOf(ofType));
}
public static bool TextEquals(this SqlNode node, string value)
{
var literal = node as SqlLiteral;
if (literal != null && string.Equals(literal.Text, value, StringComparison.OrdinalIgnoreCase))
{
return(true);
}
return(false);
}
public override bool Equals(SqlNode obj)
{
var literal = obj as SqlLiteral;
if (literal == null)
{
return(false);
}
return(base.Equals(obj) && this.Text == literal.Text);
}
private static SqlNode LastNonCommentNode(this SqlNode node)
{
if (node == null)
{
return(node);
}
var last = node;
var group = node as ISqlGroupNode;
while (group != null)
{
last = group.Items.Where(i => i.Type != SqlType.Comment).Last();
group = last as ISqlGroupNode;
}
if (last.Type == SqlType.Comment)
{
return(null);
}
return(last);
}
public override bool Equals(SqlNode obj)
{
var literal = obj as SqlLiteral;
if (literal == null) return false;
return base.Equals(obj) && this.Text == literal.Text;
}
public virtual bool Equals(SqlNode obj)
{
return this.StartOffset == obj.StartOffset;
}