protected virtual void Visit(ForEachStatement forEachStatement)
{
WriteLinkLine(forEachStatement);
if (forEachStatement.Variable == null)
{
localVariableCount++;
Identifier parameterType;
Identifier parameterMember;
if (!TryParameters(forEachStatement.Collection, out parameterType, out parameterMember))
{
Write(@"#error ""Unexpected parameter for 'foreach params' [");
VisitDynamic(forEachStatement.Collection);
WriteLine(@"]. Expecting single property access""");
return;
}
string variable = "____" + localVariableCount;
Write("foreach(").Write("var ").Write(variable).Write(" in ");
VisitDynamic(forEachStatement.Collection);
WriteLine(")");
var statement = forEachStatement.Body as BlockStatement;
if (statement == null)
{
statement = new BlockStatement {Span = forEachStatement.Body.Span};
statement.Statements.Add(forEachStatement.Body);
}
AddPushPopParameters(statement, parameterType, parameterMember, new VariableReferenceExpression(variable), forEachStatement.Span);
VisitDynamic(statement);
localVariableCount--;
}
else
{
Write("foreach(");
IsVisitingVariableInlines = true;
VisitDynamic(forEachStatement.Variable);
IsVisitingVariableInlines = false;
Write(" in ");
VisitDynamic(forEachStatement.Collection);
Write(")");
WriteLine();
VisitDynamic(forEachStatement.Body);
}
}
/// <summary>
/// Creates a ForStatement with the same behavior
/// </summary>
/// <param name="forEachStatement">the ForEachStatement</param>
/// <returns>the ForStatement</returns>
private static ForStatement ExpandForEachStatement(ForEachStatement forEachStatement)
{
if (forEachStatement != null)
{
var collec = forEachStatement.Collection.TypeInference.Declaration as Variable;
LiteralExpression dimLit = null;
if (collec.Type is ArrayType)
{
if ((collec.Type as ArrayType).Dimensions.Count == 1)
{
dimLit = (collec.Type as ArrayType).Dimensions[0] as LiteralExpression;
}
}
if (dimLit != null)
{
var initializer = new Variable(ScalarType.Int, forEachStatement.Variable.Name.Text + "Iter", new LiteralExpression(0));
var vre = new VariableReferenceExpression(initializer.Name);
var condition = new BinaryExpression(BinaryOperator.Less, vre, dimLit);
var next = new UnaryExpression(UnaryOperator.PreIncrement, vre);
ForStatement forStatement = new ForStatement(new DeclarationStatement(initializer), condition, next);
var body = new BlockStatement();
var variable = forEachStatement.Variable;
variable.InitialValue = new IndexerExpression(forEachStatement.Collection, new VariableReferenceExpression(initializer));
body.Statements.Add(new DeclarationStatement(variable));
if (forEachStatement.Body is BlockStatement)
body.Statements.AddRange((forEachStatement.Body as BlockStatement).Statements);
else
body.Statements.Add(forEachStatement.Body);
forStatement.Body = body;
return forStatement;
}
// TODO: multidimension-array?
// TODO: unroll?
// TODO: multiple foreach?
}
return null;
}
private Node Visit(ForEachStatement forEachStatement)
{
if (expandForEachStatements)
{
// run analysis on collection
Visit(forEachStatement.Collection);
var inference = forEachStatement.Collection.TypeInference.Declaration as Variable;
if (!(inference != null && inference.Type is ArrayType))
return forEachStatement;
if ((inference.Type as ArrayType).Dimensions.Count > 1)
{
Error(XenkoMessageCode.ErrorMultiDimArray, forEachStatement.Span, inference, forEachStatement, analyzedModuleMixin.MixinName);
return forEachStatement;
}
var dim = (int)((inference.Type as ArrayType).Dimensions.FirstOrDefault() as LiteralExpression).Value;
var result = new StatementList();
for (int i = 0; i < dim; ++i)
{
var cloned = forEachStatement.DeepClone();
var replace = new XenkoReplaceExtern(cloned.Variable, new IndexerExpression(cloned.Collection, new LiteralExpression(i)));
replace.Run(cloned.Body);
result.Add(cloned.Body);
}
Visit((Node)result);
return result;
}
else
{
Visit((Node)forEachStatement);
parsingInfo.ForEachStatements.Add(new StatementNodeCouple(forEachStatement, ParentNode));
return forEachStatement;
}
}