public void TestToExpressionString()
{
for (int i = 0; i < identNodes.Length; i++)
{
identNodes[i].Validate(SupportExprValidationContextFactory.Make(container, streamTypeService));
}
Assert.AreEqual("Mapped('a')", ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(identNodes[0]));
Assert.AreEqual("Nested.NestedValue", ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(identNodes[1]));
Assert.AreEqual("s2.Indexed[1]", ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(identNodes[2]));
Assert.AreEqual("s0.IntPrimitive", ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(identNodes[3]));
}
public override void ToPrecedenceFreeEPL(TextWriter writer)
{
writer.Write(ParameterName);
writer.Write(":");
if (ChildNodes.Length > 1) {
writer.Write("(");
}
ExprNodeUtilityPrint.ToExpressionStringParameterList(ChildNodes, writer);
if (ChildNodes.Length > 1) {
writer.Write(")");
}
}
/// <summary>
/// Validates the expression node subtree that has this
/// node as root. Some of the nodes of the tree, including the
/// root, might be replaced in the process.
/// </summary>
/// <param name="origin">validate origin</param>
/// <param name="exprNode">node</param>
/// <param name="validationContext">context</param>
/// <returns>the root node of the validated subtree, possibly different than the root node of the unvalidated subtree
/// </returns>
/// <throws>ExprValidationException when the validation fails</throws>
public static ExprNode GetValidatedSubtree(
ExprNodeOrigin origin,
ExprNode exprNode,
ExprValidationContext validationContext)
{
if (exprNode is ExprLambdaGoesNode) {
return exprNode;
}
try {
return GetValidatedSubtreeInternal(exprNode, validationContext, true);
}
catch (ExprValidationException ex) {
try {
string text;
if (exprNode is ExprSubselectNode subselect) {
text = ExprNodeUtilityMake.GetSubqueryInfoText(subselect);
}
else {
text = ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(exprNode);
if (text.Length > 40) {
string shortened = text.Substring(0, 35);
text = shortened + "...(" + text.Length + " chars)";
}
text = "'" + text + "'";
}
var errorText = string.Format(
"Failed to validate {0} expression {1}: {2}",
origin.GetClauseName(),
text,
ex.Message);
throw new ExprValidationException(errorText, ex);
}
catch (ExprValidationException) {
throw;
}
catch (EPException) {
throw;
}
catch (Exception rtex) {
Log.Debug("Failed to render nice validation message text: " + rtex.Message, rtex);
// fall through
}
throw;
}
}
private void HandleGetForge(IInvocation invocation)
{
var expressionToString = "undefined";
try {
expressionToString = ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(Proxy);
}
catch (EPException) {
throw;
}
catch (Exception) {
// no action
}
var forge = (ExprForge) invocation.Method.Invoke(Proxy, invocation.Arguments);
invocation.ReturnValue = ExprForgeProxy.NewInstance(expressionToString, forge);
}
private static void ValidatePlainExpression(
ExprNodeOrigin origin,
ExprNode expression,
ExprNodeSummaryVisitor summaryVisitor)
{
expression.Accept(summaryVisitor);
if (summaryVisitor.HasAggregation ||
summaryVisitor.HasSubselect ||
summaryVisitor.HasStreamSelect ||
summaryVisitor.HasPreviousPrior) {
string text = ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(expression);
throw new ExprValidationException(
"Invalid " +
origin.GetClauseName() +
" expression '" +
text +
"': Aggregation, sub-select, previous or prior functions are not supported in this context");
}
}
public override void ToPrecedenceFreeEPL(TextWriter writer)
{
ExprNodeUtilityPrint.ToExpressionStringWFunctionName("grouping_id", ChildNodes, writer);
}
private static ExprAssignment CheckGetStraightAssignment(
ExprNode node,
bool allowLHSVariables)
{
var prop = CheckGetAssignmentToProp(node);
if (prop != null) {
return new ExprAssignmentStraight(node, new ExprAssignmentLHSIdent(prop.First), prop.Second);
}
if (!(node is ExprEqualsNode)) {
return null;
}
var equals = (ExprEqualsNode) node;
var lhs = equals.ChildNodes[0];
var rhs = equals.ChildNodes[1];
if (lhs is ExprVariableNode) {
var variableNode = (ExprVariableNode) equals.ChildNodes[0];
if (!allowLHSVariables) {
throw new ExprValidationException(
"Left-hand-side does not allow variables for variable '" + variableNode.VariableMetadata.VariableName + "'");
}
var variableNameWSubprop = variableNode.VariableNameWithSubProp;
var variableName = variableNameWSubprop;
String subPropertyName = null;
var indexOfDot = variableNameWSubprop.IndexOf('.');
if (indexOfDot != -1) {
subPropertyName = variableNameWSubprop.Substring(indexOfDot + 1);
variableName = variableNameWSubprop.Substring(0, indexOfDot);
}
ExprAssignmentLHS lhsAssign;
if (subPropertyName != null) {
lhsAssign = new ExprAssignmentLHSIdentWSubprop(variableName, subPropertyName);
}
else {
lhsAssign = new ExprAssignmentLHSIdent(variableName);
}
return new ExprAssignmentStraight(node, lhsAssign, rhs);
}
if (lhs is ExprDotNode dot) {
var chainables = dot.ChainSpec;
if (chainables.Count == 2 &&
chainables[0] is ChainableName name &&
chainables[1] is ChainableArray array) {
return new ExprAssignmentStraight(node, new ExprAssignmentLHSArrayElement(name.Name, array.Indexes), rhs);
}
if (allowLHSVariables &&
dot.ChildNodes[0] is ExprVariableNode variableNode &&
chainables.Count == 1 &&
chainables[0] is ChainableArray chainableArray) {
return new ExprAssignmentStraight(
node,
new ExprAssignmentLHSArrayElement(
variableNode.VariableMetadata.VariableName,
chainableArray.Indexes),
rhs);
}
throw new ExprValidationException(
"Unrecognized left-hand-side assignment '" + ExprNodeUtilityPrint.ToExpressionStringMinPrecedenceSafe(dot) + "'");
}
if (lhs is ExprTableAccessNode) {
throw new ExprValidationException("Table access expression not allowed on the left hand side, please remove the table prefix");
}
return null;
}