public SyntaxNode ReplaceDeconstructions(SyntaxNode root, SemanticModel model)
{
var assignments = root
.DescendantNodes()
.OfType <AssignmentExpressionSyntax>()
.Where(ae => ae.Left is TupleExpressionSyntax || ae.Left is DeclarationExpressionSyntax de && de.Designation is ParenthesizedVariableDesignationSyntax);
Dictionary <AssignmentExpressionSyntax, DeconstructionInfo> infos = new Dictionary <AssignmentExpressionSyntax, DeconstructionInfo>();
List <AssignmentExpressionSyntax> nodes = new List <AssignmentExpressionSyntax>();
foreach (var assignment in assignments)
{
var deconstructionInfo = model.GetDeconstructionInfo(assignment);
infos.Add(assignment, deconstructionInfo);
nodes.Add(assignment);
}
if (nodes.Count > 0)
{
root = root.ReplaceNodes(nodes, (n1, n2) =>
{
var assignment = n2;
var deconstructionInfo = infos[n1];
var tuple = assignment.Left;
var obj = assignment.Right;
return(DeconstructionToMethod(tuple, obj, deconstructionInfo));
});
}
return(root);
}
public SyntaxNode ReplaceForeachDeconstructions(SyntaxNode root, SemanticModel model)
{
var loops = root
.DescendantNodes()
.OfType <ForEachVariableStatementSyntax>()
.Where(forEach => forEach.Variable is TupleExpressionSyntax || forEach.Variable is DeclarationExpressionSyntax de && de.Designation is ParenthesizedVariableDesignationSyntax);
if (loops.Any())
{
Dictionary <ForEachVariableStatementSyntax, DeconstructionInfo> infos = new Dictionary <ForEachVariableStatementSyntax, DeconstructionInfo>();
foreach (var loop in loops)
{
try
{
var deconstructionInfo = model.GetDeconstructionInfo(loop);
infos.Add(loop, deconstructionInfo);
}
catch (Exception e)
{
throw new ReplacerException(loop, e);
}
}
var tempIndex = 0;
root = root.ReplaceNodes(loops, (n1, n2) => {
var variable = n2.Variable;
string instance = "_d" + ++tempIndex;
if (n1.Parent != null)
{
var info = LocalUsageGatherer.GatherInfo(model, n1.Parent);
while (info.DirectlyOrIndirectlyUsedLocals.Any(s => s.Name == instance) || info.Names.Contains(instance))
{
instance = "_d" + ++tempIndex;
}
}
var newloop = SyntaxFactory.ForEachStatement(SyntaxFactory.IdentifierName("var"), SyntaxFactory.Identifier(instance), n2.Expression, n2.Statement)
.WithLeadingTrivia(n2.GetLeadingTrivia())
.WithTrailingTrivia(n2.GetTrailingTrivia());
var deconstructionInfo = infos[n1];
var invocation = DeconstructionToMethod(variable, SyntaxFactory.IdentifierName(instance), deconstructionInfo);
if (newloop.Statement is BlockSyntax b)
{
foreach (var statement in b.Statements)
{
try
{
if (statement.ContainsAnnotations)
{
var annotaions = statement.GetAnnotations("last_variable");
if (annotaions != null && annotaions.Any())
{
newloop = newloop.InsertNodesAfter(statement, new[] { SyntaxFactory.ExpressionStatement(invocation) });
break;
}
}
}
catch (Exception e)
{
throw new ReplacerException(statement, e);
}
}
}
return(newloop.NormalizeWhitespace().WithTrailingTrivia(SyntaxFactory.Whitespace("\n")));
});
}
return(root);
}
