public Empty Visit(DekiScriptDomForeach expr, DekiScriptDomEvaluationState state)
{
var context = state.Context;
var env = state.Env;
var parent = state.Parent;
try {
DekiScriptGeneratorEvaluation.Instance.Generate(expr.Generator, delegate(DekiScriptEnv subEnv) {
// evaluate nodes
expr.Node.VisitWith(this, new DekiScriptDomEvaluationState(context, parent, subEnv));
}, env.NewLocalScope());
} catch (Exception e) {
EmbedExceptionMessage(expr, env, context, e, parent);
}
return(Empty.Value);
}
public DekiScriptDom Visit(DekiScriptDomForeach expr, DekiScriptOptimizerState state)
{
// TODO (steveb): partial evaluation broke with the introduction of generators
return(expr);
//DekiScriptExpression collection = Collection.Optimize(mode, env);
//// check if we can unroll the loop
//if(collection is DekiScriptLiteral) {
// // retrieve collection
// List<DekiScriptLiteral> list;
// if(collection is DekiScriptList) {
// // loop over list values
// list = ((DekiScriptList)collection).Value;
// } else if(collection is DekiScriptMap) {
// // loop over map values
// list = new List<DekiScriptLiteral>(((DekiScriptMap)collection).Value.Values);
// } else if(collection is DekiScriptXml) {
// // loop over xml selection
// List<XDoc> selection = ((DekiScriptXml)collection).Value.ToList();
// list = new List<DekiScriptLiteral>(selection.Count);
// foreach(XDoc doc in selection) {
// list.Add(new DekiScriptXml(doc));
// }
// } else if(collection is DekiScriptNil) {
// // nothing to do
// list = new List<DekiScriptLiteral>();
// } else {
// throw new DekiScriptBadTypeException(0, 0, ((DekiScriptLiteral)collection).ScriptType, new DekiScriptType[] { DekiScriptType.LIST, DekiScriptType.MAP, DekiScriptType.XML, DekiScriptType.NIL });
// }
// // loop over collection
// int index = 0;
// int count = 0;
// List<DekiScriptDom> nodes = new List<DekiScriptDom>();
// foreach(DekiScriptLiteral value in list) {
// // set the environment variable
// DekiScriptEnv locals = env.NewLocalScope();
// locals.Locals.Add(Variable, value);
// locals.Locals.Add(DekiScriptRuntime.COUNT_ID, DekiScriptNumber.New(count));
// locals.Locals.Add(DekiScriptRuntime.INDEX_ID, DekiScriptNumber.New(index));
// // check if we should skip this item
// ++index;
// DekiScriptExpression where = null;
// if(Where != null) {
// where = Where.Optimize(mode, locals);
// if((where is DekiScriptLiteral) && ((DekiScriptLiteral)where).IsNilFalseZero) {
// continue;
// }
// }
// ++count;
// // evaluate nodes
// DekiScriptDom node = (where != null) ? new DekiScriptDomIfElse(Location, new Tuplet<DekiScriptExpression, DekiScriptDom>(where, Node)) : Node;
// nodes.Add(node.Optimize(mode, locals));
// }
// if(nodes.Count == 1) {
// return nodes[0];
// }
// return DekiScriptDomSequence.New(Location, nodes);
//} else {
// // setup locals with unknown values
// DekiScriptEnv locals = env.NewLocalScope();
// locals.Locals.Add(Variable, DekiScriptUnknown.Value);
// locals.Locals.Add(DekiScriptRuntime.COUNT_ID, DekiScriptUnknown.Value);
// locals.Locals.Add(DekiScriptRuntime.INDEX_ID, DekiScriptUnknown.Value);
// // partially evaluate inner loop
// DekiScriptExpression where = (Where != null) ? Where.Optimize(mode, locals) : null;
// DekiScriptDom node = Node.Optimize(mode, locals);
// return new DekiScriptDomForeach(Location, Variable, collection, where, node);
//}
}