private static Instruction GetInstructions(ParserState state, Token previous)
{
Instruction inst = new Instruction();
do
{
if (state.PeepToken().Name == ",")
{
state.PopToken();
}
Token open = state.PopToken();
if (open == null || open.Name != "(")
{
previous.ThrowException("Expected program format: (A1,G1),(A2,G2),...,(An,Gn)");
}
Token a = state.PopToken();
if (a == null)
{
open.ThrowException("Expected action");
}
if (a.Name == ")")
{
return(inst);
}
if (state.Action.ContainsKey(a.Name) == false)
{
open.ThrowException("Expected action");
}
Token comma = state.PopToken();
if (comma == null || comma.Name != ",")
{
a.ThrowException("Comma should separate an action and a set of agents");
}
MultiAgentLanguageModels.Action a1 = new MultiAgentLanguageModels.Action(a.Name);
AgentsList g = GetAgentList(state);
Token close = state.PopToken();
if (close == null || close.Name != ")")
{
a.ThrowException("Expected )");
}
inst.Add(new Tuple <MultiAgentLanguageModels.Action, AgentsList>(a1, g));
} while (state.PeepToken() != null && state.PeepToken().Name == ",");
return(inst);
}
public static void ParseKeyword(ParserState state, Token firstToken)
{
switch (firstToken.Name)
{
case "initially":
LogicElement le = EntryC1(state);
Initially st = new Initially(le);
state.Expression.Add(st);
break;
case "noninertial":
ParseNoninertial(state, firstToken);
break;
case "by":
Token action = state.TokenList[state.TokenList.Count - 1];
state.TokenList.RemoveAt(state.TokenList.Count - 1);
AgentsList al = GetAgentList(state);
if (al == null)
{
firstToken.ThrowException("Expected ']' at the end of agents list.");
}
Token t = state.PopToken();
if (t == null)
{
firstToken.ThrowException("Expected 'causes' or 'releases'.");
}
LogicElement result = null;
if (t.Name == "releases")
{
Token fT = state.PopToken();
if (fT == null)
{
firstToken.ThrowException("Expected fluent after release.");
}
else if (!state.Fluent.ContainsKey(fT.Name))
{
firstToken.ThrowException("Attempting to use undeclared fluent.");
}
result = state.Fluent[fT.Name];
}
else
if (t.Name == "causes")
{
result = EntryC1(state);
}
else
{
t.ThrowException("Expected 'causes' or 'releases'.");
}
if (t.Name == "releases" && (result is Fluent) == false)
{
t.ThrowException("Expected fluent after release.");
}
LogicElement condition = null;
Token if_token = state.PeepToken();
if (if_token != null && if_token.Name == "if")
{
state.PopToken();
condition = EntryC1(state);
}
if (t.Name == "causes")
{
if (condition == null)
{
state.Expression.Add(new MultiAgentLanguageModels.Expressions.ByCauses(
new MultiAgentLanguageModels.Action(action.Name),
al, result));
}
else
{
state.Expression.Add(new MultiAgentLanguageModels.Expressions.ByCausesIf(
new MultiAgentLanguageModels.Action(action.Name),
al, result, condition));
}
}
if (t.Name == "releases")
{
if (condition == null)
{
state.Expression.Add(new MultiAgentLanguageModels.Expressions.ByReleases(
new MultiAgentLanguageModels.Action(action.Name),
al, (Fluent)result));
state.Expression.Add(new MultiAgentLanguageModels.Expressions.ByCauses(
new MultiAgentLanguageModels.Action(action.Name),
al, new Or(result, new Not(result))));
}
else
{
state.Expression.Add(new MultiAgentLanguageModels.Expressions.ByReleasesIf(
new MultiAgentLanguageModels.Action(action.Name),
al, (Fluent)result, condition));
state.Expression.Add(new MultiAgentLanguageModels.Expressions.ByCausesIf(
new MultiAgentLanguageModels.Action(action.Name),
al, new Or(result, new Not(result)), condition));
}
}
break;
case "causes":
MultiAgentLanguageModels.Action act =
new MultiAgentLanguageModels.Action(state.TokenList[state.TokenList.Count - 1].Name);
state.TokenList.RemoveAt(state.TokenList.Count - 1);
LogicElement effect = EntryC1(state);
Token if_exp = state.PeepToken();
if (if_exp != null && if_exp.Name == "if")
{
state.PopToken();
LogicElement con = EntryC1(state);
state.Expression.Add(new CausesIf(act, effect, con));
}
else
{
state.Expression.Add(new Causes(act, effect));
}
break;
case "releases":
MultiAgentLanguageModels.Action act1 =
new MultiAgentLanguageModels.Action(state.TokenList[state.TokenList.Count - 1].Name);
state.TokenList.RemoveAt(state.TokenList.Count - 1);
Token eff1 = state.PopToken();
if (eff1 == null)
{
firstToken.ThrowException("Expected fluent after release.");
}
else if (!state.Fluent.ContainsKey(eff1.Name))
{
firstToken.ThrowException("Attempting to use undeclared fluent.");
}
Token if_expr = state.PeepToken();
if (if_expr != null && if_expr.Name == "if")
{
state.PopToken();
LogicElement con = EntryC1(state);
state.Expression.Add(new ReleasesIf(act1, state.Fluent[eff1.Name], con));
state.Expression.Add(new CausesIf(act1, new Or(state.Fluent[eff1.Name], new Not(state.Fluent[eff1.Name])), con));
}
else
{
state.Expression.Add(new Releases(act1, state.Fluent[eff1.Name]));
state.Expression.Add(new Causes(act1, new Or(state.Fluent[eff1.Name], new Not(state.Fluent[eff1.Name]))));
}
break;
case "if":
firstToken.ThrowException("Unexpected 'if' token.");
break;
case "impossible":
Token token = state.PopToken();
if (token == null)
{
firstToken.ThrowException("Expected action name.");
}
if (!state.Action.ContainsKey(token.Name))
{
token.ThrowException("Unknown action name.");
}
MultiAgentLanguageModels.Action ac = new MultiAgentLanguageModels.Action(token.Name);
Token key = state.PopToken();
if (key == null)
{
firstToken.ThrowException("Expected 'by' or 'if' token.");
}
AgentsList agentsList = null;
if (key.Name == "by")
{
agentsList = GetAgentList(state);
Token cond_st = state.PeepToken();
if (cond_st == null || cond_st.Name != "if")
{
state.Expression.Add(new ImpossibleBy(ac, agentsList));
}
else
{
state.PopToken();
LogicElement c = EntryC1(state);
state.Expression.Add(new ImpossibleByIf(ac, agentsList, c));
}
}
else if (key.Name == "if")
{
//Token cond_st = state.PopToken();
//if (cond_st == null || cond_st.Name != "if")
//key.ThrowException("Expected if after the list of agents.");
LogicElement c = EntryC1(state);
state.Expression.Add(new ImpossibleIf(ac, c));
}
else
{
firstToken.ThrowException("Expected 'by' or 'if' token.");
}
break;
case "always":
LogicElement cond = EntryC1(state);
state.Expression.Add(new Always(cond));
break;
case "not":
Token act2 = state.TokenList[state.TokenList.Count - 1];
MultiAgentLanguageModels.Action actt = new MultiAgentLanguageModels.Action(act2.Name);
state.TokenList.RemoveAt(state.TokenList.Count - 1);
Token by = state.PopToken();
if (by == null || by.Name != "by")
{
firstToken.ThrowException("Expected 'by' after 'not'.");
}
AgentsList agents = GetAgentList(state);
Token if_st = state.PeepToken();
if (if_st != null && if_st.Name == "if")
{
state.PopToken();
condition = EntryC1(state);
foreach (Agent a in agents)
{
state.Expression.Add(new ImpossibleByIf(actt, new AgentsList()
{
a
}, condition));
Output.Print($"{actt.Name} not by {a.Name} under cond {condition.ToString()}");
}
}
else
{
foreach (Agent a in agents)
{
state.Expression.Add(new ImpossibleBy(actt, new AgentsList()
{
a
}));
}
}
break;
case "after":
LogicElement observable = EntryC1(state);
Token aft = state.PopToken();
if (aft == null || aft.Name != "after")
{
firstToken.ThrowException("Expected 'after' after logic expression.");
}
Instruction instr = GetInstructions(state, aft);
After after_exp = new After(observable, instr);
state.Expression.Add(after_exp);
break;
case "observable":
LogicElement obs = EntryC1(state);
Token after = state.PopToken();
if (after == null || after.Name != "after")
{
firstToken.ThrowException("Expected 'after' after logic expression.");
}
Instruction inst = GetInstructions(state, after);
ObservableAfter obsAfter = new ObservableAfter(obs, inst);
state.Expression.Add(obsAfter);
break;
}
}
