/// <summary>
/// Tries to parse a script node.
/// </summary>
/// <param name="Parser">Custom parser.</param>
/// <param name="Result">Parsed Script Node.</param>
/// <returns>If successful in parsing a script node.</returns>
public bool TryParse(ScriptParser Parser, out ScriptNode Result)
{
Result = null;
try
{
string s = Parser.NextToken().ToUpper();
if (s != "FROM")
{
return(false);
}
if (!SelectParser.TryParseSources(Parser, out SourceDefinition Source))
{
return(false);
}
ScriptNode Where = null;
s = Parser.PeekNextToken().ToUpper();
if (s == "WHERE")
{
Parser.NextToken();
Where = Parser.ParseOrs();
}
Result = new Delete(Source, Where, Parser.Start, Parser.Length, Parser.Expression);
return(true);
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// Tries to parse a script node.
/// </summary>
/// <param name="Parser">Custom parser.</param>
/// <param name="Result">Parsed Script Node.</param>
/// <returns>If successful in parsing a script node.</returns>
public bool TryParse(ScriptParser Parser, out ScriptNode Result)
{
Result = null;
try
{
string s = Parser.NextToken().ToUpper();
if (s != "INDEX")
{
return(false);
}
ScriptNode Name = Parser.ParseNoWhiteSpace();
s = Parser.NextToken().ToUpper();
if (s != "ON")
{
return(false);
}
if (!SelectParser.TryParseSources(Parser, out SourceDefinition Source))
{
return(false);
}
Result = new DropIndex(Name, Source, Parser.Start, Parser.Length, Parser.Expression);
return(true);
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// Tries to parse a script node.
/// </summary>
/// <param name="Parser">Custom parser.</param>
/// <param name="Result">Parsed Script Node.</param>
/// <returns>If successful in parsing a script node.</returns>
public bool TryParse(ScriptParser Parser, out ScriptNode Result)
{
Result = null;
try
{
string s = Parser.NextToken().ToUpper();
if (s != "INDEX")
{
return(false);
}
ScriptNode Name = Parser.ParseNoWhiteSpace();
s = Parser.NextToken().ToUpper();
if (s != "ON")
{
return(false);
}
if (!SelectParser.TryParseSources(Parser, out SourceDefinition Source))
{
return(false);
}
s = Parser.NextToken();
if (s != "(")
{
return(false);
}
this.ParseList(Parser, out ScriptNode[] Columns, out bool[] Ascending);
if (Columns.Length == 0)
{
return(false);
}
if (Parser.NextToken() != ")")
{
return(false);
}
Result = new CreateIndex(Name, Source, Columns, Ascending, Parser.Start, Parser.Length, Parser.Expression);
return(true);
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// Tries to parse a script node.
/// </summary>
/// <param name="Parser">Custom parser.</param>
/// <param name="Result">Parsed Script Node.</param>
/// <returns>If successful in parsing a script node.</returns>
public bool TryParse(ScriptParser Parser, out ScriptNode Result)
{
Result = null;
try
{
string s = Parser.NextToken().ToUpper();
switch (s)
{
case "INDEX":
ScriptNode Name = Parser.ParseNoWhiteSpace();
s = Parser.NextToken().ToUpper();
if (s != "ON")
{
return(false);
}
if (!SelectParser.TryParseSources(Parser, out SourceDefinition Source))
{
return(false);
}
Result = new DropIndex(Name, Source, Parser.Start, Parser.Length, Parser.Expression);
return(true);
case "TABLE":
case "COLLECTION":
if (!SelectParser.TryParseSources(Parser, out Source))
{
return(false);
}
Result = new DropCollection(Source, Parser.Start, Parser.Length, Parser.Expression);
return(true);
default:
return(false);
}
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// Tries to parse a script node.
/// </summary>
/// <param name="Parser">Custom parser.</param>
/// <param name="Result">Parsed Script Node.</param>
/// <returns>If successful in parsing a script node.</returns>
public bool TryParse(ScriptParser Parser, out ScriptNode Result)
{
Result = null;
try
{
string s = Parser.NextToken().ToUpper();
if (s != "INTO")
{
return(false);
}
if (!SelectParser.TryParseSources(Parser, out SourceDefinition Source))
{
return(false);
}
switch (Parser.PeekNextToken().ToUpper())
{
case "(":
Parser.NextToken();
ScriptNode Node = Parser.ParseList();
if (!(Node is ElementList Columns))
{
Columns = new ElementList(new ScriptNode[] { Node }, Node.Start, Node.Length, Node.Expression);
}
if (Parser.NextToken() != ")")
{
return(false);
}
if (Parser.NextToken().ToUpper() != "VALUES")
{
return(false);
}
if (Parser.NextToken() != "(")
{
return(false);
}
Node = Parser.ParseList();
if (!(Node is ElementList Values))
{
Values = new ElementList(new ScriptNode[] { Node }, Node.Start, Node.Length, Node.Expression);
}
if (Values.Elements.Length != Columns.Elements.Length)
{
return(false);
}
if (Parser.NextToken() != ")")
{
return(false);
}
Result = new InsertValues(Source, Columns, Values, Parser.Start, Parser.Length, Parser.Expression);
return(true);
case "SELECT":
Node = Parser.ParseStatement();
if (!(Node is Select Select))
{
return(false);
}
Result = new InsertSelect(Source, Select, Parser.Start, Parser.Position, Parser.Expression);
return(true);
case "OBJECT":
case "OBJECTS":
Parser.NextToken();
Node = Parser.ParseList();
if (!(Node is ElementList Objects))
{
Objects = new ElementList(new ScriptNode[] { Node }, Node.Start, Node.Length, Node.Expression);
}
Result = new InsertObjects(Source, Objects, Parser.Start, Parser.Length, Parser.Expression);
return(true);
default:
return(false);
}
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// Tries to parse a script node.
/// </summary>
/// <param name="Parser">Custom parser.</param>
/// <param name="Result">Parsed Script Node.</param>
/// <returns>If successful in parsing a script node.</returns>
public bool TryParse(ScriptParser Parser, out ScriptNode Result)
{
Result = null;
try
{
if (!SelectParser.TryParseSources(Parser, out SourceDefinition Source))
{
return(false);
}
string s = Parser.NextToken().ToUpper();
if (s != "SET")
{
return(false);
}
List <Assignment> SetOperations = new List <Assignment>();
ScriptNode Node = Parser.ParseList();
if (!(Node is ElementList List))
{
List = new ElementList(new ScriptNode[] { Node }, Node.Start, Node.Length, Node.Expression);
}
foreach (ScriptNode Operation in List.Elements)
{
if (Operation is EqualTo EqualTo)
{
if (EqualTo.LeftOperand is VariableReference Ref)
{
SetOperations.Add(new Assignment(Ref.VariableName, EqualTo.RightOperand, EqualTo.Start, EqualTo.Length, EqualTo.Expression));
}
else
{
return(false);
}
}
else if (Operation is Assignment Assignment)
{
SetOperations.Add(Assignment);
}
else
{
return(false);
}
}
ScriptNode Where = null;
s = Parser.PeekNextToken().ToUpper();
if (s == "WHERE")
{
Parser.NextToken();
Where = Parser.ParseOrs();
}
Result = new Update(Source, SetOperations.ToArray(), Where, Parser.Start, Parser.Length, Parser.Expression);
return(true);
}
catch (Exception)
{
return(false);
}
}
