public DekiScriptLiteral Visit(DekiScriptSequence expr, DekiScriptEnv env)
{
if (expr.Kind != DekiScriptSequence.ScopeKind.None)
{
env = env.NewLocalScope();
}
bool safe = env.IsSafeMode;
DekiScriptEvaluationAccumulator accumulator = new DekiScriptEvaluationAccumulator();
foreach (DekiScriptExpression expression in expr.List)
{
try {
accumulator.Add(expression.VisitWith(this, env), safe);
} catch (DekiScriptAbort.Exception e) {
// flow control exception occurred (e.g. break/continue)
accumulator.Add(e.AccumulatedState, safe);
switch (expr.Kind)
{
case DekiScriptSequence.ScopeKind.ScopeCatchContinue:
if (e.FlowControl == DekiScriptAbort.Kind.Continue)
{
return(accumulator.Value);
}
break;
case DekiScriptSequence.ScopeKind.ScopeCatchBreakAndContinue:
return(accumulator.Value);
}
throw new DekiScriptAbort.Exception(e.FlowControl, accumulator.Value);
}
}
return(accumulator.Value);
}
public DekiScriptLiteral Visit(DekiScriptForeach expr, DekiScriptEnv env)
{
bool safe = env.IsSafeMode;
try {
DekiScriptEvaluationAccumulator accumulator = new DekiScriptEvaluationAccumulator();
DekiScriptGeneratorEvaluation.Instance.Generate(expr.Generator, delegate(DekiScriptEnv subEnv) {
// iterate over block statements
try {
accumulator.Add(expr.Block.VisitWith(this, subEnv), safe);
} catch (DekiScriptAbort.Exception e) {
accumulator.Add(e.AccumulatedState, safe);
if (e.FlowControl == DekiScriptAbort.Kind.Break)
{
throw new DekiScriptAbort.Exception(e.FlowControl, accumulator.Value);
}
}
}, env.NewLocalScope());
return(accumulator.Value);
} catch (DekiScriptAbort.Exception e) {
return(e.AccumulatedState);
}
}