// Create piece index from array of section nodes
// Note: Also does sanity check (first peek inside game/variant definition)
// The passed in parser is used to generate meaningful errors
Dictionary <string, Node> CreatePieceLookup(NodeListParser nlp)
{
Dictionary <string, Node> lookup = new Dictionary <string, Node>();
while (!nlp.Done)
{
var pnode = nlp.Current; // could be a piece section
var nlp2 = nlp.GetParser();
// note: cannot use anything that relies on CheckedIdent
nlp.Expect(nlp2.IsIdent, "section identifier");
if (nlp2.GetNode().AsIdent.Name == "piece")
{
while (true)
{
nlp2.Expect(nlp2.IsList, "piece name");
var nlp3 = nlp2.GetParser();
if (nlp3.IsIdent && nlp3.GetNode().AsIdent.Name == "name")
{
if (nlp3.IsIdent)
{
lookup[nlp3.GetNode().AsIdent.Name] = pnode;
break;
}
}
}
}
}
return(lookup);
}
// Compile a scoped expression that returns a typed value
DataTypes CompileExpr(PredefScopes predef, NodeListParser nlp)
{
Logger.WriteLine(2, "CompileExpr {0} <{1}>", predef, nlp);
Symbols.PushPredefScope(predef);
var codetype = Symbols.PredefScopeDict[predef].CodeType;
_gen.EmitEntry(codetype);
nlp.Expect(nlp.IsCallable, "callable function");
var sexpr = nlp.GetSexprNode();
nlp.Expect(sexpr.DataType != DataTypes.Void, "typed function");
CompileSexpr(sexpr, nlp);
Symbols.PopPredefScope();
_gen.EmitExit(true);
return(sexpr.DataType);
}
// compile a prog block inside an existing scope
internal void CompileProg(NodeListParser nlp)
{
Logger.WriteLine(2, "CompileProg <{0}>", nlp);
// iterate over the action items in the prog block
while (!nlp.Done)
{
// value -- special handler
if (nlp.IsValue || nlp.IsValueCallable)
{
if (!CompileHandler("--value", nlp))
{
nlp.Syntax("bare value not allowed");
}
// callable function, call it
}
else if (nlp.IsCallable)
{
if (nlp.IsFunc && nlp.CurrentIdent.Sym.Keyword == Keywords.ELSE)
{
return; // sneaky!
}
var sexpr = nlp.GetSexprNode();
nlp.Expect(sexpr.DataType == DataTypes.Void, "void function");
CompileSexpr(sexpr, nlp);
// list -- special handler
}
else if (nlp.IsList)
{
var handler = Symbols.Find("--list") as BuiltinSymbol;
if (handler != null)
{
CompileBuiltin(handler, nlp.GetParser());
}
else
{
nlp.Unexpected("unknown function");
}
}
else
{
nlp.Expected("function call");
}
}
}
//--------------------------------------------------------------------------
// Parsers for individual productions that return a data structure
//: (TURN-ORDER { player | ( player move-type ) | ( player player ) | ( player player move-type ) | REPEAT }+ )?
TurnDef ParseTurnDef(NodeListParser nlparg)
{
Logger.WriteLine(4, "ParseTurnDef <{0}>", nlparg);
nlparg.Expect(nlparg.IsIdent || nlparg.IsList, "player or list");
var nlp = nlparg.GetParser();
var ident = nlp.GetIdent();
if (ident.Name == "repeat")
{
nlp.CheckDone();
return(TurnDef.Repeat);
}
var player = DefPlayer(ident);
// default is to play as self
var playeras = nlp.IsIdent && nlp.Current.IsPlayer ? DefPlayer(nlp.GetIdent()) : player;
var movetype = nlp.IsIdent ? DefMoveType(nlp.GetIdent()) : MoveTypeValue.Any;
nlp.CheckDone();
return(new TurnDef {
TurnPlayer = player, MovePlayer = playeras, MoveType = movetype
});
}
// Compile a function with given arguments
void CompileBuiltin(BuiltinSymbol funcsym, NodeListParser nlp)
{
Logger.WriteLine(3, "CompileBuiltin {0} <{1}>", funcsym.Name, nlp);
var ci = funcsym.CallInfo;
for (int i = 0; i < ci.Arguments.Count; i++)
{
if (ci.ArgOptional[i] && nlp.Done)
{
_gen.EmitLoadValue(null);
}
else if (ci.Arguments[i] == typeof(AttributeValue))
{
_gen.EmitLoadValue(DefAttribute(nlp.GetIdent())); // special for attribute
}
// TODO: could possibly check for combo of boolean expected and undefined ident, and emit false
else
{
CompileArg(ci.Arguments[i], nlp);
}
}
nlp.Expect(nlp.Done, "no more arguments for {0}", funcsym.Name);
_gen.EmitCall(funcsym);
}
// Compile an argument of given type
void CompileArg(Type type, NodeListParser nlp)
{
Logger.WriteLine(4, "CompileArg {0} <{1}>", type, nlp);
var func = _typeactiondict.SafeLookup(type);
// special for variable assignment and implicit definition
if (type == typeof(Variable))
{
var ident = nlp.GetIdent();
var datatype = DataTypes.Bool; // TODO: handle other types
if (ident.Sym.IsVariable)
{
nlp.Expect(ident.Sym.DataType == datatype, "variable of type {0}", datatype);
}
else if (ident.Sym.IsUndef)
{
Symbols.DefineVariable(ident.Name, datatype, BoolValue.False);
}
else
{
nlp.Expected("defined variable");
}
_gen.EmitRefVar(ident.Sym);
// handle these separately, could be variable or function
}
else if (type.IsSubclassOf(typeof(TypedValue)))
{
// TODO: type checking
CompileValue(type, nlp);
//var exptype = TypedValue.DataTypeDict.SafeLookup(type);
//var rettype = CompileValue(type, nlp);
//nlp.Expect(rettype == exptype, "value of type {0}", exptype);
// direct lookup gets special cases; else continue
}
else if (func != null)
{
var value = func(type, nlp, this);
_gen.EmitLoadValue(value);
// Array means parse a list of this type
}
else if (type.IsArray)
{
var nargs = 0;
for (var nlp2 = nlp.GetParser(); !nlp2.Done; nargs++)
{
CompileArg(type.GetElementType(), nlp2);
}
_gen.EmitToArray(type, nargs);
// List<> means parse a tail of this type
}
else if (type.IsGenericType && type.Name.StartsWith("List"))
{
var nargs = 0;
for (; !nlp.Done; ++nargs)
{
CompileArg(type.GetGenericArguments()[0], nlp);
}
_gen.EmitToList(type, nargs);
// Pair<> means parse a pair of arbitrary types
}
else if (type.IsGenericType && type.Name.StartsWith("Pair"))
{
var nlp2 = nlp.GetParser();
foreach (var subtype in type.GetGenericArguments())
{
CompileArg(subtype, nlp2);
}
_gen.EmitToPair(type);
// nested prog block
}
else if (type.IsSubclassOf(typeof(CodeBase)))
{
var info = Symbols.PredefScopeDict.First(kv => kv.Value.CodeType == type).Value;
CompileProg(info, nlp);
}
else if (type == typeof(PositionOrDirection))
{
CompilePositionOrDirection(nlp);
// function call on built in
}
else if (nlp.IsSexpr)
{
var sexpr = nlp.GetSexprNode();
var datatype = TypedValue.DataTypeDict.SafeLookup(type);
nlp.Expect(sexpr.DataType == datatype, "value of type {0}", datatype);
CompileBuiltin(sexpr.Sym as BuiltinSymbol, NodeListParser.Create(sexpr.Args, Symbols));
}
else
{
nlp.Syntax("unknown type {0}", type);
}
}
Maybe <PositionOrZone> ParseMaybePositionOrZone(NodeListParser nlp)
{
if (nlp.IsConstant)
{
var value = nlp.Current.AsValue;
if (value is PositionValue || value is ZoneValue)
{
return new Maybe <PositionOrZone> {
Value = ParsePositionOrZone(nlp)
}
}
;
}
return(new Maybe <PositionOrZone> {
});
}
// parse a term which may be a position, direction or opposite
void CompilePositionOrDirection(NodeListParser nlp)
{
var rettype = CompileValue(typeof(TypedValue), nlp);
nlp.Expect(rettype == DataTypes.Position || rettype == DataTypes.Direction, "position or direction");
var funcsym = Symbols.Find("--pos-or-dir");
_gen.EmitCall(funcsym as BuiltinSymbol);
}
//protected PositionOrDirection ParsePositionOrDirection(NodeListParser nlp) {
// if (nlp.IsValue) {
// var value = nlp.GetValue();
// if (value is PositionValue || value is DirectionValue)
// return new PositionOrDirection { Value = value };
// }
// nlp.Expected("position or direction");
// return null;
//}
GoKinds ParseGoKind(NodeListParser nlp)
{
var ident = nlp.GetIdent();
var gosym = Symbols.Find(ident.Name, PredefKinds.GO);
nlp.Expect(gosym != null, "valid go target");
return(gosym.GoKind);
}
Maybe <PlayerValue[]> ParseMaybePlayers(NodeListParser nlp)
{
if (!(nlp.IsList && nlp.CheckedHead.IsPlayer))
{
return(Maybe <PlayerValue[]> .Null);
}
return(Maybe <PlayerValue[]> .Create(nlp.GetParser().UntilDone(n => DefPlayer(n.GetIdent())).ToArray()));
}
Maybe <PieceValue> ParseMaybePiece(NodeListParser nlp)
{
return((nlp.IsIdent && nlp.Current.IsPiece)
? Maybe <PieceValue> .Create(DefPiece(nlp.GetIdent()))
: Maybe <PieceValue> .Null);
}
Maybe <PlayerValue> ParseMaybePlayer(NodeListParser nlp)
{
return((nlp.IsIdent && nlp.Current.IsPlayer)
? Maybe <PlayerValue> .Create(DefPlayer(nlp.GetIdent()))
: Maybe <PlayerValue> .Null);
}
}
