public DekiScriptExpression Visit(DekiScriptListConstructor expr, DekiScriptExpressionEvaluationState state)
{
// TODO (steveb): need to figure out how to optimize lists with generators
if (expr.Generator != null)
{
return(expr);
}
// optimize each item in the list
DekiScriptExpression[] list = new DekiScriptExpression[expr.Items.Length];
bool isLiteral = true;
for (int i = 0; i < expr.Items.Length; i++)
{
DekiScriptExpression item = expr.Items[i].VisitWith(this, state);
list[i] = item;
isLiteral = isLiteral && (item is DekiScriptLiteral);
}
if (!isLiteral)
{
return(DekiScriptExpression.List(expr.Location, list));
}
// convert expression to a list
DekiScriptList result = new DekiScriptList();
foreach (DekiScriptLiteral literal in list)
{
result.Add(literal);
}
return(result);
}
public DekiScriptLiteral Visit(DekiScriptListConstructor expr, DekiScriptEnv env)
{
DekiScriptList result = new DekiScriptList();
if (expr.Generator == null)
{
foreach (DekiScriptExpression item in expr.Items)
{
result.Add(item.VisitWith(this, env));
}
}
else
{
DekiScriptGeneratorEvaluation.Instance.Generate(expr.Generator, delegate(DekiScriptEnv subEnv) {
foreach (DekiScriptExpression item in expr.Items)
{
result.Add(item.VisitWith(this, subEnv));
}
}, env.NewLocalScope());
}
return(result);
}
public DekiScriptOutputBuffer.Range Visit(DekiScriptListConstructor expr, DekiScriptExpressionEvaluationState state)
{
DekiScriptList result = new DekiScriptList();
if (expr.Generator == null)
{
foreach (DekiScriptExpression item in expr.Items)
{
result.Add(state.Pop(item.VisitWith(this, state)));
}
}
else
{
DekiScriptGeneratorEvaluation.Generate(expr.Generator, delegate(DekiScriptEnv subEnv) {
foreach (DekiScriptExpression item in expr.Items)
{
var eval = state.Pop(item.VisitWith(this, state.With(subEnv)));
result.Add(eval);
}
}, state);
}
return(state.Push(result));
}
