private SqlInfixOperationNode ParseUpdateColumnAssignExpression(ITokenizer t)
{
// (<Column> | <Variable>) <CompareOp> ("DEFAULT" | <Expression>)
var columnName = ParseVariableOrQualifiedIdentifier(t);
// TODO: Other assignment operators
var opToken = t.Expect(SqlTokenType.Symbol, "=", "+=", "-=", "*=", "/=", "%=", "&=", "^=", "|=");
ISqlNode rvalue;
var lookahead = t.Peek();
if (lookahead.Is(SqlTokenType.Keyword, "DEFAULT"))
{
t.GetNext();
rvalue = new SqlKeywordNode(lookahead);
}
else
{
rvalue = ParseScalarExpression(t);
}
return(new SqlInfixOperationNode
{
Left = columnName,
Location = columnName.Location,
Operator = new SqlOperatorNode(opToken),
Right = rvalue
});
}
public SqlExecuteArgumentNode ParseExecArgument(ITokenizer t)
{
// (<parameter> "=")? (<Expression> | "DEFAULT" | <Variable> ("OUT"|"OUTPUT"))
var next = t.GetNext();
if (next.IsSymbol(";") || next.IsType(SqlTokenType.EndOfInput))
{
return(null);
}
if (next.IsKeyword("DEFAULT"))
{
var keyword = new SqlKeywordNode(next);
return(new SqlExecuteArgumentNode
{
Location = keyword.Location,
Value = keyword
});
}
if (next.IsType(SqlTokenType.Variable))
{
var lookahead = t.Peek();
if (lookahead.IsSymbol("="))
{
t.GetNext();
return(new SqlExecuteArgumentNode
{
Location = next.Location,
AssignVariable = new SqlVariableNode(next),
Value = ParseScalarExpression(t),
IsOut = t.NextIs(SqlTokenType.Keyword, "OUT", true) || t.NextIs(SqlTokenType.Keyword, "OUTPUT", true)
});
}
}
ISqlNode expression = null;
if (next.IsType(SqlTokenType.Identifier, SqlTokenType.Number, SqlTokenType.QuotedString, SqlTokenType.Variable))
{
t.PutBack(next);
expression = ParseScalarExpression(t);
}
else if (next.IsType(SqlTokenType.Keyword))
{
if (t.Peek().IsSymbol("("))
{
t.PutBack(next);
expression = ParseScalarExpression(t);
}
}
if (expression == null)
{
t.PutBack(next);
return(null);
}
return(new SqlExecuteArgumentNode
{
Location = next.Location,
Value = expression,
IsOut = t.NextIs(SqlTokenType.Keyword, "OUT", true) || t.NextIs(SqlTokenType.Keyword, "OUTPUT", true)
});
}
public ISqlNode VisitKeyword(SqlKeywordNode n)
{
Append(n.Keyword);
return(n);
}
public virtual ISqlNode VisitKeyword(SqlKeywordNode n) => n;
public override ISqlNode VisitKeyword(SqlKeywordNode n)
{
_result.AssertIsNotNullOrEmpty(n, nameof(n.Keyword), n.Keyword);
return(base.VisitKeyword(n));
}
