Examples of edu.mit.csail.sdg.alloy4.Listener

edu.mit.csail.sdg.alloy4.ErrorSyntax
This defines an interface for receiving events.

            }
            env = oldenv;
            return ans;
        }
        Object ans = sfs.get(x);
        if (ans instanceof SimTupleset) return (SimTupleset)ans; else throw new ErrorFatal("Unknown field "+x+" encountered during evaluation.");
    }

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        if (x.op == ExprQt.Op.NO)   return enumerate(null, 0, x, x.sub,       0) == 0;
        if (x.op == ExprQt.Op.SOME) return enumerate(null, 0, x, x.sub,       0) >= 1;
        if (x.op == ExprQt.Op.LONE) return enumerate(null, 0, x, x.sub,       0) <= 1;
        if (x.op == ExprQt.Op.ONE)  return enumerate(null, 0, x, x.sub,       0) == 1;
        if (x.op == ExprQt.Op.SUM)  return trunc(enumerate(null, 0, x, x.sub, 0));
        throw new ErrorFatal(x.pos, "Unsupported operator ("+x.op+") encountered during ExprQt.accept()");
    }

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        try {
            for(XMLNode sub:tuple) if (sub.is("atom")) {
                Tuple x = factory.tuple(sub.getAttribute("label"));
                if (ans==null) ans=x; else ans=ans.product(x);
            }
            if (ans==null) throw new ErrorFatal("Expecting: <tuple> <atom label=\"..\"/> .. </tuple>");
            if (ans.arity()!=arity) throw new ErrorFatal("Expecting: tuple of arity "+arity+" but got tuple of arity "+ans.arity());
            return ans;
        } catch(Throwable ex) {
            throw new ErrorFatal("Expecting: <tuple> <atom label=\"..\"/> .. </tuple>", ex);
        }
    }

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       try {
          if (sigs == null) sigs = new ArrayList<Sig>();
          A4SolutionReader x = new A4SolutionReader(sigs, xml);
          return x.sol;
       } catch(Throwable ex) {
          if (ex instanceof Err) throw ((Err)ex); else throw new ErrorFatal("Fatal error occured: "+ex, ex);
       }
    }

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        this.root = root;
        this.bitwidth = bitwidth;
        this.maxseq = maxseq;
        this.callbacks = new HashMap<Func,SimCallback>();
        if (bitwidth==32) { max=Integer.MAX_VALUE; min=Integer.MIN_VALUE; } else { max=(1<<(bitwidth-1))-1; min=(0-max)-1; }
        if (maxseq < 0)   throw new ErrorSyntax("The maximum sequence length cannot be negative.");
        if (maxseq > max) throw new ErrorSyntax("With integer bitwidth of "+bitwidth+", you cannot have sequence length longer than "+max);
        shiftmask = (1 << (32 - Integer.numberOfLeadingZeros(bitwidth-1))) - 1;
    }

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        final int n = f.count();
        final Object candidate = n==0 ? cacheForConstants.get(f) : null;
        if (candidate!=null) return candidate;
        final Expr body = f.getBody();
        if (body.type().arity()<0 || body.type().arity()!=f.returnDecl.type().arity()) throw new ErrorType(body.span(), "Function return value not fully resolved.");
        for(Func ff:current_function) if (ff==f) throw new ErrorSyntax(x.span(), ""+f+" cannot call itself recursively!");
        Env<ExprVar,Object> newenv = new Env<ExprVar,Object>();
        List<SimTupleset> list = new ArrayList<SimTupleset>(x.args.size());
        for(int i=0; i<n; i++) { SimTupleset ts = cset(x.args.get(i)); newenv.put(f.get(i), ts);  list.add(ts); }
        final SimCallback cb = callbacks.get(f);
        if (cb!=null) {

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           allsigs.add(s);
           choices.add(s);
           for(Field f:s.getFields()) choices.add(f);
       }
       // find <instance>..</instance>
       if (!xml.is("alloy")) throw new ErrorSyntax("The XML file's root node must be <alloy> or <instance>.");
       XMLNode inst = null;
       for(XMLNode sub: xml) if (sub.is("instance")) { inst=sub; break; }
       if (inst==null) throw new ErrorSyntax("The XML file must contain an <instance> element.");
       // set up the basic values of the A4Solution object
       final int bitwidth = Integer.parseInt(inst.getAttribute("bitwidth"));
       final int maxseq = Integer.parseInt(inst.getAttribute("maxseq"));
       final int max = (1<<(bitwidth-1))-1, min = 0-(1<<(bitwidth-1));
       if (bitwidth>=1 && bitwidth<=30) for(int i=min; i<=max; i++) { atoms.add(Integer.toString(i)); }

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        this.isPred = (returnDecl==null);
        if (returnDecl==null) returnDecl = ExprConstant.FALSE;
        if (returnDecl.mult==0 && returnDecl.type.arity()==1) returnDecl = ExprUnary.Op.ONEOF.make(null, returnDecl);
        this.returnDecl = returnDecl;
        this.body = body;
        if (body.mult!=0) throw new ErrorSyntax(body.span(), "Multiplicity expression not allowed here.");
        this.decls = ConstList.make(decls);
        for(int n=count(), i=0; i<n; i++)
          for(int j=i+1; j<n; j++)
            if (get(i)==get(j))
              throw new ErrorSyntax(get(j).span(),
                "The same variable cannot appear more than once in a predicate/function's parameter list.");
        for(Decl d: this.decls) if (d.expr!=null && d.expr.hasCall())
           throw new ErrorSyntax(d.expr.span(), "Parameter declaration cannot contain predicate/function calls.");
        if (returnDecl.hasCall())
           throw new ErrorSyntax(returnDecl.span(), "Return type declaration cannot contain predicate/function calls.");
    }

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            if (newBody.type.arity() != returnDecl.type.arity())
               throw new ErrorType(newBody.span(),
               "Function return type is "+returnDecl.type+",\nso the body must be a relation with arity "
               +returnDecl.type.arity()+".\nSo the body's type cannot be: "+newBody.type);
        }
        if (newBody.mult!=0) throw new ErrorSyntax(newBody.span(), "Multiplicity expression not allowed here.");
        this.body = newBody;
    }

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        boolean ambiguous = false;
        JoinableList<Err> errs = emptyListOfErrors;
        TempList<Expr> newargs = new TempList<Expr>(args.size());
        if (args.size() != fun.count()) {
            errs = errs.make(
              new ErrorSyntax(pos, ""+fun+" has "+fun.count()+" parameters but is called with "+args.size()+" arguments."));
        }
        for(int i=0; i<args.size(); i++) {
            final int a = (i<fun.count()) ? fun.get(i).type.arity() : 0;
            final Expr x = args.get(i).typecheck_as_set();
            ambiguous = ambiguous || x.ambiguous;
            errs = errs.make(x.errors);
            weight = weight + x.weight;
            if (x.mult!=0) errs = errs.make(new ErrorSyntax(x.span(), "Multiplicity expression not allowed here."));
            if (a>0 && x.errors.isEmpty() && !x.type.hasArity(a))
              errs = errs.make(new ErrorType(x.span(), "This should have arity "+a+" but instead its possible type(s) are "+x.type));
            newargs.add(x);
        }
        Type t=Type.FORMULA;

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