C# IfStatementSyntax.GetLeadingTrivia方法代码示例

 private static async Task<Document> UseExistenceOperatorAsyncWithReturnAsync(Document document, IfStatementSyntax ifStatement, CancellationToken cancellationToken, ReturnStatementSyntax returnIf)
 {
     var newMemberAccess = ((MemberAccessExpressionSyntax)returnIf.Expression).ToConditionalAccessExpression();
     var newReturn = SyntaxFactory.ReturnStatement(newMemberAccess)
         .WithLeadingTrivia(ifStatement.GetLeadingTrivia())
         .WithTrailingTrivia(ifStatement.GetTrailingTrivia())
         .WithAdditionalAnnotations(Formatter.Annotation);
     var root = await document.GetSyntaxRootAsync(cancellationToken);
     var newRoot = root.ReplaceNode(ifStatement, newReturn);
     var newDocument = document.WithSyntaxRoot(newRoot);
     return newDocument;
 }

 private static SyntaxNode MergeIfs(IfStatementSyntax ifStatement, SyntaxNode root)
 {
     var nestedIf = (IfStatementSyntax)ifStatement.Statement.GetSingleStatementFromPossibleBlock();
     var newIf = ifStatement
         .WithCondition(SyntaxFactory.BinaryExpression(SyntaxKind.LogicalAndExpression, ifStatement.Condition, nestedIf.Condition))
         .WithStatement(nestedIf.Statement)
         .WithLeadingTrivia(ifStatement.GetLeadingTrivia().AddRange(nestedIf.GetLeadingTrivia()))
         .WithAdditionalAnnotations(Formatter.Annotation);
     if (ifStatement.HasTrailingTrivia && nestedIf.HasTrailingTrivia && !ifStatement.GetTrailingTrivia().Equals(nestedIf.GetTrailingTrivia()))
         newIf = newIf.WithTrailingTrivia(ifStatement.GetTrailingTrivia().AddRange(nestedIf.GetTrailingTrivia()));
     var newRoot = root.ReplaceNode(ifStatement, newIf);
     return newRoot;
 }

 private static async Task<Document> UseExistenceOperatorAsyncWithAssignmentAsync(Document document, IfStatementSyntax ifStatement, CancellationToken cancellationToken, ExpressionStatementSyntax expressionIf)
 {
     var memberAccessAssignment = (AssignmentExpressionSyntax)expressionIf.Expression;
     var newMemberAccess = ((MemberAccessExpressionSyntax)memberAccessAssignment.Right).ToConditionalAccessExpression();
     var newExpressionStatement = SyntaxFactory.ExpressionStatement(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, memberAccessAssignment.Left, newMemberAccess))
         .WithLeadingTrivia(ifStatement.GetLeadingTrivia())
         .WithTrailingTrivia(ifStatement.GetTrailingTrivia())
         .WithAdditionalAnnotations(Formatter.Annotation);
     var root = await document.GetSyntaxRootAsync(cancellationToken);
     var newRoot = root.ReplaceNode(ifStatement, newExpressionStatement);
     var newDocument = document.WithSyntaxRoot(newRoot);
     return newDocument;
 }

        private Decisions TraverseIfStatements(IfStatementSyntax iss, ref int exitPoints, bool nested = false)
        {
            Decisions retDecision = new Decisions();
            IfStatement ifStm = new IfStatement();
            if (iss.HasLeadingTrivia)
            {
                SetOuterComments(ifStm, iss.GetLeadingTrivia().ToFullString());
            }

            if (iss.HasTrailingTrivia)
            {
                SetInnerComments(ifStm, iss.GetTrailingTrivia().ToFullString());
            }
            ifStm.IsNested = nested;
            //public int ExpressionListEndLn { get; set; }
            //public int ExpressionListStartLn { get; set; }
            //public bool IsNested { get; set; }
            ExpressionSyntax es = iss.Condition;
            var binaryExpressions = from aBinaryExpression in iss.Condition.DescendantNodesAndSelf().OfType<BinaryExpressionSyntax>() select aBinaryExpression;
            ifStm.ConditionCount = binaryExpressions.Count();
            //This area is for the conditions i.e. the stuff in the () of if ()
            foreach (BinaryExpressionSyntax bes in binaryExpressions)
            {
                Method tempMethod = TraverseBinaryExpression(bes);
                ifStm.AccessedVars.AddRange(tempMethod.AccessedVariables);
                ifStm.InvokedMethods.AddRange(tempMethod.InvokedMethods);
            }
            //TODO handle catches (if there are even catches inside if statements)
            var catches = from aCatch in iss.ChildNodes().OfType<CatchClauseSyntax>() select aCatch;
            foreach (CatchClauseSyntax ccs in catches)
            {
                Decisions tempCatch = TraverseCatchClauses(ccs, ref exitPoints, true);
                ifStm.Nested.AddRange(tempCatch.Catches);
            }
            //TODO need to handle else clauses
            var elses = from aElse in iss.ChildNodes().OfType<ElseClauseSyntax>() select aElse;
            foreach (ElseClauseSyntax ecs in elses)
            {
                //TODO
                //Traverse ElseClauseSyntax
                Decisions tempElse = TraverseElseClauses(ecs, ref exitPoints, true);
                ifStm.Nested.AddRange(tempElse.ElseStatements);
                #region old code with method return
                //ifStm.InvokedMethods.AddRange(tempElse.InvokedMethods);
                //ifStm.AccessedVars.AddRange(tempElse.AccessedVars);
                //ifStm.Nested.Add(tempElse);
                //foreach (BaseDecisions bd in ifStm.Nested)
                //{
                //    bd.IsNested = true;
                //}
                #endregion
            }
            //TODO need to find a way to return both nested
            //and invoked methods / accessedvars to the parent method
            var statements = from aStatement in iss.Statement.ChildNodes().OfType<StatementSyntax>() select aStatement;
            List<BaseDecisions> retBd = new List<BaseDecisions>();
            List<InvokedMethod> retIm = new List<InvokedMethod>();
            #region Nested and Invoked Methods and accessed vars
            foreach (StatementSyntax ss in statements)
            {

                //if (ss is BreakStatementSyntax)
                //{
                //}
                //else if (ss is CheckedStatementSyntax)
                //{
                //}
                //else if (ss is ContinueStatementSyntax)
                //{
                //}
                if (ss is DoStatementSyntax)
                {
                    Decisions dwl = TraverseDoStatements(ss as DoStatementSyntax, ref exitPoints, true);
                    ifStm.Nested.AddRange(dwl.DoWhileLoops);
                    //dwl.IsNested = true;
                    //ifStm.Nested.Add(dwl);
                }
                //else if (ss is EmptyStatementSyntax)
                //{
                //}
                else if (ss is ExpressionStatementSyntax)
                {
                    Method tempMethod = TraverseExpressionStatementSyntax(ss as ExpressionStatementSyntax);
                    ifStm.AccessedVars.AddRange(tempMethod.AccessedVariables);
                    ifStm.InvokedMethods.AddRange(tempMethod.InvokedMethods);
                }
                //else if (ss is FixedStatementSyntax)
                //{
                //}
                else if (ss is ForEachStatementSyntax)
                {
                    Decisions fes = TraverseForEachStatements(ss as ForEachStatementSyntax, ref exitPoints, true);
                    ifStm.Nested.AddRange(fes.ForEachStatements);
                    //fes.IsNested = true;
                    //ifStm.Nested.Add(fes);
                }
                else if (ss is ForStatementSyntax)
                {
                    Decisions fs = TraverseForStatements(ss as ForStatementSyntax, ref exitPoints, true);
                    ifStm.Nested.AddRange(fs.ForStatements);
//.........这里部分代码省略.........