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is-op.js
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is-op.js
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function is$(obj,type,containers){
if(type && type.t){
if(type.t==='i'||type.t==='u'){
return isOfTypes(obj, type);
} else if (type.t===Finished) {
return obj===finished();
}
if(obj===null||obj===undefined){
return type.t===Null||type.t===Anything;
}
if(obj.getT$all===undefined || !obj.getT$all()){
if(obj.$crtmm$){
var _mm=getrtmm$$(obj);
//We can navigate the metamodel
if(_mm.d['mt']==='m'){
if(type.t===Callable){
//It's a callable reference
if(type.a&&type.a.Return$Callable&&_mm['$t']){
//Check if return type matches
if(extendsType(_mm['$t'],type.a.Return$Callable)){
if(type.a.Arguments$Callable&&_mm['ps']!==undefined){
var metaparams=_mm['ps'];
if(metaparams.length==0){
return type.a.Arguments$Callable.t === Empty;
}else{
//check if arguments match
var comptype=type.a.Arguments$Callable;
for(var i=0;i<metaparams.length;i++){
if(comptype.t!==Tuple||!extendsType(metaparams[i]['$t'],comptype.a.First$Tuple)){
return false;
}
comptype=comptype.a.Rest$Tuple;
}
}
}
return true;
}
}
}
}
}
return false;
}
//Native arrays with no reified type args are NOT Ceylon objects.
if (obj.$$targs$$===undefined && Array.isArray(obj))return false;
if (type.t==='T') {
if (is$(obj,{t:Tuple})) {
var last_type = type.l[type.l.length-1];
if (type.l.length===obj.size || last_type.seq) {
var lim=type.l.length; if (last_type.seq)lim--;
for (var i=0;i<lim;i++) {
if (!is$(obj.$_get(i),type.l[i]))return false;
}
//This is for tuples with sequenced tails
if (last_type.seq==2 && obj.size<type.l.length) {
return false;
} else if (last_type.seq) {
for (var i=lim;i<obj.size;i++) {
if(!is$(obj.$_get(i),last_type)) {
return false;
}
}
}
return true;
} else {
return false;
}
} else {
return false;
}
}
type=value2type$(type);
if(type.t.$$.T$name in obj.getT$all()){
if(type.t==Callable&&!(obj.$$targs$$ && obj.$$targs$$.Return$Callable && obj.$$targs$$.Arguments$Callable)
&& getrtmm$$(obj)&&obj.$crtmm$.$t && obj.$crtmm$.ps!==undefined){
//Callable with no $$targs$$, we can build them from metamodel
add_type_arg(obj,'Return$Callable',obj.$crtmm$.$t);
add_type_arg(obj,'Arguments$Callable',{t:'T',l:[]});
for(var i=0;i<obj.$crtmm$.ps.length;i++){
obj.$$targs$$.Arguments$Callable.l.push(obj.$crtmm$.ps[i].$t);
}
if (obj.$$targs$$.Arguments$Callable.l.length===0)obj.$$targs$$.Arguments$Callable={t:Empty};
}
if(type.a && obj.$$targs$$) {
for(var i in type.a) {
var cmptype=type.a[i];
var tmpobj=obj;
var iance=cmptype.uv||null;
var _mm=getrtmm$$(type.t);
if(!iance&&_mm&&_mm.tp&&_mm.tp[i])iance=_mm.tp[i].dv;
if(iance===null) {
//null means no i in _mm.tp
//Type parameter may be in the outer type
while(iance===null&&tmpobj.outer$!==undefined){
tmpobj=tmpobj.outer$;
var _tmpf = tmpobj.constructor.T$all[tmpobj.constructor.T$name];
var _mmf = getrtmm$$(_tmpf);
if(_mmf&&_mmf.tp&&_mmf.tp[i]){
iance=_mmf.tp[i].dv;
}
if(iance===null&&_mmf&&_mmf['super']){
//lookup the type parameter in the supertype
var smm=getrtmm$$(_mmf['super'].t);
if(smm&&smm.tp&&smm.tp[i])iance=smm.tp[i].dv;
}
if(iance===null&&_mmf&&_mmf.sts){
var sats=_mmf.sts;
for(var s=0;iance===null&&s<sats.length;s++){
var smm=getrtmm$$(sats[s].t);
if (smm&&smm.tp&&smm.tp[i])iance=smm.tp[i].dv;
}
}
}
}
if(iance===null) {
//if the type has a container it could be a method
//in which case the type parameter could be defined there
var _omm=_mm;
while(iance===null&&_omm) {
if(_omm.tp&&_omm.tp[i]!==undefined){
iance=_omm.tp[i].dv;
tmpobj=obj;
}
if(iance===null)_omm=getrtmm$$(_omm.$cont);
}
}
if (iance === 'out') {
if (!extendsType(tmpobj.$$targs$$[i], cmptype,true)) {
return false;
}
} else if (iance === 'in') {
if (!extendsType(cmptype, tmpobj.$$targs$$[i],true)) {
return false;
}
} else if (iance === undefined) {
var _targ=tmpobj.$$targs$$[i];
if (!(_targ && _targ.t && (_targ.t.$$ || _targ.t==='i' || _targ.t==='u')))return false;
if (_targ.t.$$) {
if (cmptype && cmptype.t && cmptype.t.$$) {
if (!(cmptype.t.$$.T$name && _targ.t.$$.T$name === cmptype.t.$$.T$name))return false;
} else if (cmptype && cmptype.t && cmptype.t==='i') {
//_targ must satisfy all types in cmptype
if (cmptype.t!==_targ.t || !cmptype.l || cmptype.l.length!==_targ.l.length)return false;
for (var i=0; i<_targ.l.length;i++) {
if (!extendsType(_targ.l[i],cmptype,true))return false;
}
} else if (cmptype && cmptype.t && cmptype.t==='u') {
//_targ must satisfy at least one type in cmptype
if (cmptype.t!==_targ.t || !cmptype.l || cmptype.l.length!==_targ.l.length)return false;
for (var i=0; i<_targ.l.length;i++) {
if (!extendsType(_targ.l[i],cmptype,true))return false;
}
}
} else {
if (cmptype.t!==_targ.t || !cmptype.l || cmptype.l.length!==_targ.l.length)return false;
for (var i=0; i<_targ.l.length;i++) {
if (!extendsType(_targ.l[i],cmptype,true))return false;
}
}
} else if (iance === null) {
console.log("Possible missing metamodel for " + type.t.$$.T$name + "<" + i + ">");
} else {
console.log("Don't know what to do about variance '" + iance + "'");
}
}
}
//TODO If the object is a member of a type with type arguments,
//check that the outer type arguments match
if (containers) {
var cnt=obj.outer$;
if (cnt) {
//Nested types, check all outers
for (var i=0; i<containers.length; i++) {
if (!is$(cnt,containers[i]))return false;
cnt=cnt.outer$;
}
} else if (obj.$$targs$$) {
//Method argument types
for (var t in containers) {
if (obj.$$targs$$[t] && containers[t] && !extendsType(obj.$$targs$$[t], containers[t], true))return false;
}
}
}
return true;
}
}
return false;
}
function isOfTypes(obj, types) {
if (obj===null) {
for (var i=0; i < types.l.length; i++) {
if(types.l[i].t===Null || types.l[i].t===Anything) return true;
else if (types.l[i].t==='u') {
if (isOfTypes(null, types.l[i])) return true;
}
}
return false;
}
if (obj === undefined || obj.getT$all === undefined) { return false; }
var unions = false;
var inters = true;
var _ints=false;
var objTypes = obj.getT$all();
for (var i = 0; i < types.l.length; i++) {
var t = types.l[i];
var partial = is$(obj, t);
if (types.t==='u') {
unions = partial || unions;
} else {
inters = partial && inters;
_ints=true;
}
}
return _ints ? inters||unions : unions;
}
//Tells whether t1 is a subtype of t2
//tparm indicates if the calculations are being done on type parameters
function extendsType(t1, t2,tparm) {
if (t1 === undefined || t1.t === undefined || t1.t === Nothing || t2 === undefined || t2.t === undefined) {
return true;//t2 === undefined;
} else if (t2 && t2.t === Anything) {
return true;
} else if (t1 === null) {
return t2.t === Null || t2.t === Anything;
}
if (t1.t === 'u' || t1.t === 'i') {
if (t1.t==='i')removeSupertypes(t1.l);
var unions = false;
var inters = true;
var _ints = false;
for (var i = 0; i < t1.l.length; i++) {
var partial = extendsType(t1.l[i],t2,tparm);
if (t1.t==='u'&&!tparm) {
unions = partial||unions;
} else {
inters = partial&&inters;
_ints=true;
}
}
return _ints ? inters||unions : unions;
}
if (t2.t === 'u' || t2.t === 'i') {
if (t2.t==='i')removeSupertypes(t2.l);
var unions = false;
var inters = true;
var _ints = false;
for (var i = 0; i < t2.l.length; i++) {
var partial = extendsType(t1, t2.l[i],tparm);
if (t2.t==='u') {
unions = partial||unions;
} else {
inters = partial&&inters;
_ints=true;
}
}
return _ints ? inters||unions : unions;
}
if (t1.t==='T') {
if (t2.t==='T') {
if (t1.l.length>=t2.l.length) {
for (var i=0; i < t2.l.length;i++) {
if (!extendsType(t1.l[i],t2.l[i],tparm))return false;
}
return true;
} else return false;
} else {
t1=retpl$(t1);
}
} else if (t2.t==='T') {
t2=retpl$(t2);
}
t1=value2type$(t1);
for (t in t1.t.$$.T$all) {
if (t === t2.t.$$.T$name || t === 'ceylon.language::Nothing') {
if (t1.a && t2.a) {
//Compare type arguments
for (ta in t1.a) {
if (!extendsType(t1.a[ta], t2.a[ta],tparm)) return false;
}
}
return true;
}
}
return false;
}
ex$.is$=is$;