public DekiScriptExpression Visit(DekiScriptMapConstructor expr, DekiScriptExpressionEvaluationState state)
{
// TODO (steveb): need to figure out how to optimize maps with generators
if (expr.Generator != null)
{
return(expr);
}
// optimize each item in the map
var fields = new DekiScriptMapConstructor.FieldConstructor[expr.Fields.Length];
bool isLiteral = true;
for (int i = 0; i < expr.Fields.Length; i++)
{
var current = expr.Fields[i];
DekiScriptExpression key = current.Key.VisitWith(this, state);
DekiScriptExpression value = current.Value.VisitWith(this, state);
fields[i] = new DekiScriptMapConstructor.FieldConstructor(current.Location, key, value);
isLiteral = isLiteral && (key is DekiScriptLiteral) && (value is DekiScriptLiteral);
}
if (!isLiteral)
{
return(DekiScriptExpression.Map(expr.Location, fields));
}
// convert expression to a map
DekiScriptMap result = new DekiScriptMap();
foreach (var field in fields)
{
DekiScriptLiteral key = (DekiScriptLiteral)field.Key;
// check that key is a simple type
string text = key.AsString();
if (text != null)
{
result.Add(text, (DekiScriptLiteral)field.Value);
}
}
return(result);
}
void Field(out DekiScriptMapConstructor.FieldConstructor field) {
DekiScriptExpression expr = null; DekiScriptExpression key = null; string name = null; Location location = Location.None;
if (StartOf(11)) {
AnyName(out name);
key = DekiScriptExpression.Constant(name);
} else if (la.kind == 3 || la.kind == 4) {
String(out key);
} else if (la.kind == 5) {
Get();
key = DekiScriptExpression.Constant(t.val);
} else if (la.kind == 22) {
Get();
Expression(out key);
Expect(23);
} else SynErr(91);
Expect(31);
location = t.Location;
Expression(out expr);
field = new DekiScriptMapConstructor.FieldConstructor(location, key, expr);
}