public Empty Visit(DekiScriptGeneratorForeachKeyValue expr, DekiScriptGeneratorEvaluationState state)
{
DekiScriptLiteral collection = Eval(expr.Collection, state);
// retrieve collection
Dictionary <string, DekiScriptLiteral> map;
if (collection is DekiScriptMap)
{
// loop over map key-value pairs
map = ((DekiScriptMap)collection).Value;
}
else if (collection is DekiScriptNil)
{
// nothing to do
map = new Dictionary <string, DekiScriptLiteral>();
}
else
{
throw new DekiScriptBadTypeException(expr.Location, collection.ScriptType, new[] { DekiScriptType.MAP, DekiScriptType.NIL });
}
// store state of variables
var previousKey = state.State.Env.Vars[expr.Key];
var previousValue = state.State.Env.Vars[expr.Value];
var previousIndex = state.State.Env.Vars[DekiScriptRuntime.INDEX_ID];
try {
// loop over collection
int index = 0;
foreach (KeyValuePair <string, DekiScriptLiteral> entry in map)
{
// set the environment variable
state.State.Env.Vars.Add(expr.Key, DekiScriptExpression.Constant(entry.Key));
state.State.Env.Vars.Add(expr.Value, entry.Value);
state.State.Env.Vars.Add(DekiScriptRuntime.INDEX_ID, DekiScriptExpression.Constant(index));
// iterate over block statements
EvalNext(expr, state);
++index;
}
} finally {
state.State.Env.Vars.Add(expr.Key, previousKey);
state.State.Env.Vars.Add(expr.Value, previousValue);
state.State.Env.Vars.Add(DekiScriptRuntime.INDEX_ID, previousIndex);
}
return(Empty.Value);
}
public Empty Visit(DekiScriptGeneratorForeachKeyValue expr, DekiScriptGeneratorEvaluationState state)
{
DekiScriptLiteral collection = expr.Collection.VisitWith(DekiScriptExpressionEvaluation.Instance, state.Env);
// retrieve collection
Dictionary <string, DekiScriptLiteral> map;
if (collection is DekiScriptMap)
{
// loop over map key-value pairs
map = ((DekiScriptMap)collection).Value;
}
else if (collection is DekiScriptNil)
{
// nothing to do
map = new Dictionary <string, DekiScriptLiteral>();
}
else
{
throw new DekiScriptBadTypeException(expr.Line, expr.Column, collection.ScriptType, new DekiScriptType[] { DekiScriptType.MAP, DekiScriptType.NIL });
}
// loop over collection
int index = 0;
foreach (KeyValuePair <string, DekiScriptLiteral> entry in map)
{
// set the environment variable
state.Env.Locals.Add(expr.Key, DekiScriptString.New(entry.Key));
state.Env.Locals.Add(expr.Value, entry.Value);
state.Env.Locals.Add(DekiScriptRuntime.INDEX_ID, DekiScriptNumber.New(index));
// iterate over block statements
Generate(expr, state);
++index;
}
return(Empty.Value);
}
void GeneratorHead(out DekiScriptGenerator gen) {
Location location = Location.None;
Location wherelocation = Location.None;
DekiScriptExpression where = null;
List<string> names = new List<string>();
DekiScriptExpression expr = null;
string value = null;
gen = null;
Expect(19);
location = t.Location;
Expect(1);
names.Add(t.val);
if (la.kind == 31) {
Get();
Expect(1);
value = t.val;
Expect(52);
Expression(out expr);
if (la.kind == 70) {
Get();
wherelocation = t.Location;
Expression(out where);
}
} else if (la.kind == 20 || la.kind == 52) {
while (la.kind == 20) {
Get();
Expect(1);
names.Add(t.val);
}
Expect(52);
Expression(out expr);
if (la.kind == 70) {
Get();
wherelocation = t.Location;
Expression(out where);
}
} else SynErr(80);
if (la.kind == 20) {
Get();
GeneratorNext(out gen);
}
if(where != null) gen = new DekiScriptGeneratorIf(wherelocation, where, gen);
if(value == null) gen = new DekiScriptGeneratorForeachValue(location, names.ToArray(), expr, gen);
else gen = new DekiScriptGeneratorForeachKeyValue(location, names[0], value, expr, gen);
}