/// <summary>
/// Gets the translated code for the grammar structure.
/// </summary>
/// <returns>The translated code for the grammar structure.</returns>
public IEnumerable <Block> Translate(TranslationContext context)
{
List <Block> output = new List <Block>();
// Create scope of loop
Scope innerScope = new Scope(context.CurrentScope);
TranslationContext newContext = new TranslationContext(innerScope, context);
// TODO: Inbuilt foreach block optimisation
// TODO: Inline foreach
// Create counter variable
StackValue internalCounter = context.CurrentScope.CreateStackValue();
output.AddRange(internalCounter.CreateDeclaration(1));
// Create item variable
StackValue itemVar = new StackValue(Variable, VarType, false);
innerScope.StackValues.Add(itemVar);
output.AddRange(itemVar.CreateDeclaration(VarType.GetDefault()));
List <Block> loopContents = new List <Block>();
GlobalListDeclaration globalList =
context.CurrentSprite.GetList(SourceName) ?? context.Project.GetList(SourceName);
StackValue arrayValue = null;
if (globalList != null)
{
// Translate loop contents
loopContents.Add(itemVar.CreateVariableAssignment(new Block(BlockSpecs.GetItemOfList,
internalCounter.CreateVariableLookup(), SourceName)));
}
else
{
// Get stackvalue for array
arrayValue = context.CurrentScope.Search(SourceName);
if (arrayValue == null)
{
context.ErrorList.Add(new CompilerError($"Array '{SourceName}' is not defined", ErrorType.NotDefined,
ErrorToken, FileName));
return(Enumerable.Empty <Block>());
}
loopContents.Add(itemVar.CreateVariableAssignment(arrayValue.CreateArrayLookup(internalCounter.CreateVariableLookup())));
}
// Increment counter
loopContents.Add(internalCounter.CreateVariableIncrement(1));
// Translate loop main body
foreach (IEnumerable <Block> translated in Statements.Select(x => x.Translate(newContext)))
{
loopContents.AddRange(translated);
}
// Create loop Scratch block
object repeats = globalList != null ? new Block(BlockSpecs.LengthOfList, SourceName) : (object)arrayValue.StackSpace;
output.Add(new Block(BlockSpecs.Repeat, repeats, loopContents.ToArray()));
// Clean up scope
output.AddRange(internalCounter.CreateDestruction());
output.AddRange(itemVar.CreateDestruction());
return(output);
}
