public IExpression Parse(TextSpan token, IParser parser)
{
var tokenStr = parser.Scanner.GetSpanString(token);
var variableExpr = new VariableSqlCodeExpr
{
Name = tokenStr
};
if (parser.MatchToken(SqlToken.Dot))
{
var nodesExpr = parser.PrefixParse(SqlToken.NODES) as SqlCodeExpr;
parser.ConsumeToken(SqlToken.As);
var aliasName = parser.ConsumeObjectId();
parser.ConsumeToken(SqlToken.LParen);
var columnName = parser.ConsumeObjectId();
parser.ConsumeToken(SqlToken.RParen);
return(new VariableNodesSqlCodeExpr
{
Variable = variableExpr,
NodesExpr = nodesExpr,
AliasName = aliasName,
ColumnName = columnName
});
}
return(variableExpr);
}
private IExpression SetVariable(TextSpan variableSpan, IParser parser)
{
var variableExpr = new VariableSqlCodeExpr
{
Name = parser.Scanner.GetSpanString(variableSpan),
};
var oper = parser.Scanner.ConsumeStringAny(SqlToken.Equal, SqlToken.PlusEqual);
var valueExpr = parser.ParseExp() as SqlCodeExpr;
valueExpr = parser.ParseLRParenExpr(valueExpr);
return(new SetVariableSqlCodeExpr
{
Name = variableExpr,
Oper = oper,
Value = valueExpr
});
}
