private CodeMemberMethod CreateFetch(AliasBase aliasBase, out CodeTypeReference anonType)
{
var statementDomArg = VisitChild(aliasBase.Statement);
if (Scope.Current.IsTableRegistered(statementDomArg.Scope.CodeDomReference.TypeArguments[0].BaseType))
{
var scope = Scope.Current.GetTableDescriptor(statementDomArg.Scope.CodeDomReference.TypeArguments[0].BaseType);
if (aliasBase.Alias == null)
aliasBase.Children.Add(new TableAlias { Id = statementDomArg.Scope.CodeDomReference.TypeArguments[0].BaseType });
Scope.Current.Register(aliasBase.Alias.Id, new ScopeData<TableDescriptor> { Type = scope.Type, CodeDomReference = scope.CodeDomReference.TypeArguments[0] });
}
CodeMemberMethod method = new CodeMemberMethod();
method.Name = "Fetch_" + Guid.NewGuid().ToString("N");
_mainType.Type.Members.Add(method);
var anon = "anon_" + Guid.NewGuid().ToString("N");
var bufferTable = new CodeTypeDeclaration(anon) { TypeAttributes = TypeAttributes.NestedPrivate };
bufferTable.BaseTypes.Add(new CodeTypeReference("IRow"));
_mainType.Type.Members.Add(bufferTable);
var field = new CodeMemberField();
field.Name = aliasBase.Alias == null ? string.Empty : aliasBase.Alias.Id;
field.Attributes = MemberAttributes.Public | MemberAttributes.Final;
field.Type = statementDomArg.Scope.CodeDomReference.TypeArguments[0];
_joinMembers.Add(field);
bufferTable.Members.Add(field);
method.Statements.Add(new CodeVariableDeclarationStatement(statementDomArg.Scope.CodeDomReference, "table", statementDomArg.CodeExpression));
anonType = new CodeTypeReference(anon);
var copyStatments = new CodeStatementCollection();
copyStatments.Add(new CodeVariableDeclarationStatement(anonType, "t",
new CodeObjectCreateExpression(anonType)));
copyStatments.Add(new CodeAssignStatement(new CodePropertyReferenceExpression(new CodeVariableReferenceExpression("t"), field.Name),
new CodeVariableReferenceExpression("o")));
copyStatments.Add(new CodeMethodReturnStatement(new CodeVariableReferenceExpression("t")));
var codeParams = new CodeParameterDeclarationExpressionCollection();
codeParams.Add(new CodeParameterDeclarationExpression(statementDomArg.Scope.CodeDomReference.TypeArguments[0], "o"));
var copyMethod = CreateCopyMethod(codeParams, copyStatments);
var anonExpression = new CodeSnippetExpression("o => {" + GenerateCodeFromStatement(
new CodeMethodReturnStatement(
new CodeMethodInvokeExpression(new CodeMethodReferenceExpression(null, copyMethod.Name),
new CodeVariableReferenceExpression("o")))) + "}");
method.Statements.Add(new CodeMethodReturnStatement(new CodeMethodInvokeExpression(new CodeMethodReferenceExpression(
new CodeTypeReferenceExpression("table"), "Select"), anonExpression)));
method.ReturnType = new CodeTypeReference("IEnumerable", anonType);
copyMethod.ReturnType = anonType;
return method;
}
private string ReplaceBooleanStatement(AliasBase aliasBAse, string statement)
{
//the inner is the new join (ic). Everything else is outer (oc)
string innerMatch = @"row\.(" + aliasBAse.Alias.Id + @")\.(\w+)";
string outerMatch = @"row\.([^" + aliasBAse.Alias.Id + @"])\.(\w+)";
statement = Regex.Replace(statement, innerMatch, "ic.$1.$2");
statement = Regex.Replace(statement, outerMatch, "oc.$1.$2");
return statement;
}