public override AstElement Clone(Dictionary<AstElement, AstElement> alreadyClonedElements)
{
NameExpression result = new NameExpression();
result.Name = _name;
result.NameSourceRange = _nameSourceRange;
return result;
}
private static bool VisitNameExpression(NameExpression node1, NameExpression node2)
{
return node2 != null &&
node1.Name == node2.Name;
}
public override ExpressionNode VisitNameExpression(NameExpression expression)
{
_writer.WriteIdentifier(expression.Name);
return expression;
}
private ExpressionNode ParsePrimaryExpression()
{
switch (_token.Id)
{
case TokenId.NULL:
NextToken();
return LiteralExpression.FromNull();
case TokenId.TRUE:
case TokenId.FALSE:
return ParseBooleanLiteral();
case TokenId.Date:
return ParseDateLiteral();
case TokenId.Number:
return ParseNumberLiteral();
case TokenId.String:
return LiteralExpression.FromString(ParseString());
case TokenId.EXISTS:
{
ExistsSubselect result = new ExistsSubselect();
NextToken();
Match(TokenId.LeftParentheses);
result.Query = ParseQuery();
Match(TokenId.RightParentheses);
return result;
}
case TokenId.ParameterMarker:
{
_rangeRecorder.Begin();
NextToken();
Identifier name = ParseIdentifier();
SourceRange nameSourceRange = _rangeRecorder.End();
ParameterExpression result = new ParameterExpression();
result.Name = name;
result.NameSourceRange = nameSourceRange;
return result;
}
case TokenId.CAST:
{
NextToken();
CastExpression castExpression = new CastExpression();
Match(TokenId.LeftParentheses);
castExpression.Expression = ParseExpression();
Match(TokenId.AS);
castExpression.TypeReference = ParseTypeReference();
Match(TokenId.RightParentheses);
return castExpression;
}
case TokenId.CASE:
{
NextToken();
CaseExpression caseExpression = new CaseExpression();
if (_token.Id != TokenId.WHEN && _token.Id != TokenId.ELSE && _token.Id != TokenId.END)
caseExpression.InputExpression = ParseExpression();
List<ExpressionNode> whenExpressionList = new List<ExpressionNode>();
List<ExpressionNode> expressionList = new List<ExpressionNode>();
if (_token.Id != TokenId.WHEN)
{
Match(TokenId.WHEN);
}
else
{
while (_token.Id == TokenId.WHEN)
{
NextToken();
whenExpressionList.Add(ParseExpression());
Match(TokenId.THEN);
expressionList.Add(ParseExpression());
}
}
caseExpression.WhenExpressions = whenExpressionList.ToArray();
caseExpression.ThenExpressions = expressionList.ToArray();
if (_token.Id == TokenId.ELSE)
{
NextToken();
caseExpression.ElseExpression = ParseExpression();
}
Match(TokenId.END);
return caseExpression;
}
case TokenId.COALESCE:
{
NextToken();
CoalesceExpression coalesceExpression = new CoalesceExpression();
coalesceExpression.Expressions = ParseExpressionList();
return coalesceExpression;
}
case TokenId.NULLIF:
{
NextToken();
NullIfExpression nullIfExpression = new NullIfExpression();
Match(TokenId.LeftParentheses);
nullIfExpression.LeftExpression = ParseExpression();
Match(TokenId.Comma);
nullIfExpression.RightExpression = ParseExpression();
Match(TokenId.RightParentheses);
return nullIfExpression;
}
case TokenId.Identifier:
{
_rangeRecorder.Begin();
Identifier name = ParseIdentifier();
SourceRange nameSourceRange = _rangeRecorder.End();
if (_token.Id != TokenId.LeftParentheses)
{
NameExpression result = new NameExpression();
result.Name = name;
result.NameSourceRange = nameSourceRange;
return result;
}
else
{
bool hasAsteriskModifier;
ExpressionNode[] args;
if (_lookahead.Id != TokenId.Multiply)
{
hasAsteriskModifier = false;
args = ParseExpressionList();
}
else
{
NextToken();
NextToken();
Match(TokenId.RightParentheses);
hasAsteriskModifier = true;
args = new ExpressionNode[0];
}
FunctionInvocationExpression result = new FunctionInvocationExpression();
result.Name = name;
result.NameSourceRange = nameSourceRange;
result.Arguments = args;
result.HasAsteriskModifier = hasAsteriskModifier;
return result;
}
}
case TokenId.LeftParentheses:
{
NextToken();
ExpressionNode expr;
if (_token.Id != TokenId.SELECT)
{
expr = ParseExpression();
}
else
{
SingleRowSubselect singleRowSubselect = new SingleRowSubselect();
singleRowSubselect.Query = ParseQuery();
expr = singleRowSubselect;
}
Match(TokenId.RightParentheses);
return expr;
}
default:
{
_errorReporter.SimpleExpressionExpected(_token.Range, _token.Text);
return LiteralExpression.FromNull();
}
}
}
public virtual ExpressionNode VisitNameExpression(NameExpression expression)
{
return expression;
}
public override ExpressionNode VisitNameExpression(NameExpression expression)
{
// Resolve column
// -- or --
// Resolve constant
// -- or --
// Resolve parameter (without @)
// -- or --
// Reference to row object
ColumnRefBinding columnRefBinding = ResolveColumnRef(expression.NameSourceRange, expression.Name);
ConstantBinding constantBinding = ResolveConstant(expression.NameSourceRange, expression.Name);
ParameterBinding parameterBinding = ResolveParameter(expression.NameSourceRange, expression.Name);
TableRefBinding tableRefBinding = ResolveTableRef(expression.NameSourceRange, expression.Name);
if (columnRefBinding != null)
{
if (constantBinding != null)
ErrorReporter.AmbiguousReference(expression.NameSourceRange, expression.Name, new Binding[] { columnRefBinding, constantBinding });
if (parameterBinding != null)
ErrorReporter.AmbiguousReference(expression.NameSourceRange, expression.Name, new Binding[] { columnRefBinding, parameterBinding });
if (tableRefBinding != null)
ErrorReporter.AmbiguousReference(expression.NameSourceRange, expression.Name, new Binding[] { columnRefBinding, tableRefBinding });
return new ColumnExpression(columnRefBinding);
}
if (constantBinding != null)
{
if (parameterBinding != null)
ErrorReporter.AmbiguousReference(expression.NameSourceRange, expression.Name, new Binding[] { constantBinding, parameterBinding });
if (tableRefBinding != null)
ErrorReporter.AmbiguousReference(expression.NameSourceRange, expression.Name, new Binding[] { constantBinding, tableRefBinding });
return new NamedConstantExpression(constantBinding);
}
if (parameterBinding != null)
{
if (tableRefBinding != null)
ErrorReporter.AmbiguousReference(expression.NameSourceRange, expression.Name, new Binding[] { parameterBinding, tableRefBinding });
ParameterExpression parameterExpression = new ParameterExpression();
parameterExpression.Name = expression.Name;
parameterExpression.NameSourceRange = expression.NameSourceRange;
parameterExpression.Parameter = parameterBinding;
return parameterExpression;
}
if (tableRefBinding != null)
{
if (tableRefBinding.TableBinding is DerivedTableBinding ||
tableRefBinding.TableBinding is CommonTableBinding)
{
ErrorReporter.InvalidRowReference(expression.NameSourceRange, tableRefBinding);
return expression;
}
else
{
ColumnRefBinding cab = tableRefBinding.Scope.DeclareRowColumnRef(tableRefBinding);
return new ColumnExpression(cab);
}
}
// Check if there is any function with this name declared. This helps to give a better
// error message.
FunctionBinding[] functionBindings = _scope.DataContext.Functions.Find(expression.Name);
if (functionBindings != null && functionBindings.Length > 0)
{
// Report that parentheses are required in function calls.
ErrorReporter.InvocationRequiresParentheses(expression.NameSourceRange, functionBindings);
}
else
{
// Report the regular undeclared entity error message.
ErrorReporter.UndeclaredEntity(expression.NameSourceRange, expression.Name);
}
return expression;
}
public override ExpressionNode VisitNameExpression(NameExpression expression)
{
_xmlWriter.WriteStartElement("nameExpression");
_xmlWriter.WriteAttributeString("identifier", expression.Name.ToSource());
WriteTypeAttribute(expression.ExpressionType);
_xmlWriter.WriteEndElement();
return expression;
}