Preserve the contents of Dart strings with unmatched surrogate halfs by avoiding a UTF16 -> UTF8

runtime/bin/vmservice/observatory/deployed/web/index.html_bootstrap.dart.js

 // Generated by dart2js, the Dart to JavaScript compiler.
 (function($){function dart(){this.x=0}var A=new dart
 delete A.x
 var B=new dart
 delete B.x
 var C=new dart
 delete C.x
 var D=new dart
 delete D.x
 var E=new dart
@@ skipping 461 matching lines @@
 return z.substring(x,v)},
 U:function(a,b){var z,y
 if(typeof b!=="number")return H.s(b)
 if(0>=b)return""
 if(b===1||a.length===0)return a
 if(b!==b>>>0)throw H.b(C.Eq)
 for(z=a,y="";!0;){if((b&1)===1)y=z+y
 b=b>>>1
 if(b===0)break
 z+=z}return y},
+YX:function(a,b,c){var z=b-a.length
+if(z<=0)return a
+return this.U(c,z)+a},
 gNq:function(a){return new J.IA(a)},
 XU:function(a,b,c){var z,y,x,w
 if(b==null)H.vh(P.u(null))
 if(c<0||c>a.length)throw H.b(P.TE(c,0,a.length))
 if(typeof b==="string")return a.indexOf(b,c)
 z=J.x(b)
 if(!!z.$isVR){y=b.UZ(a,c)
 return y==null?-1:y.pX.index}for(x=a.length,w=c;w<=x;++w)if(z.wL(b,a,w)!=null)return w
 return-1},
 OY:function(a,b){return this.XU(a,b,0)},
@@ skipping 1770 matching lines @@
 rG:[function(a){var z=J.RE(a)
 switch(z.gfG(a)){case"IsolateCreated":break
 case"IsolateShutdown":this.pZ(z.god(a))
 break
 case"BreakpointResolved":z.god(a).Xb()
 break
 case"BreakpointReached":case"IsolateInterrupted":case"ExceptionThrown":this.pZ(z.god(a))
 J.bi(this.cC,a)
 break
 case"GC":break
-default:N.QM("").YX("Unrecognized event: "+H.d(a))
+default:N.QM("").hh("Unrecognized event: "+H.d(a))
 break}},"$1","gR7",2,0,86,87],
 kj:[function(a){this.Pv=a
 this.aX("error/",null)},"$1","gtb",2,0,88,23],
 m0:[function(a){this.Pv=a
 if(J.xC(J.Iz(a),"NetworkException"))this.Z6.bo(0,"#/vm-connect/")
 else this.aX("error/",null)},"$1","geO",2,0,89,90],
 aX:function(a,b){var z,y,x,w,v,u
 z=b==null?P.Fl(null,null):P.Ms(b,C.xM)
 y=J.U6(z)
 if(y.t(z,"trace")!=null){x=y.t(z,"trace")
@@ skipping 13 matching lines @@
 v.nq(v,u)}v.fz=y
 v.Q0(a)
 return}}throw H.b(P.a9())},
 yN:function(a){var z,y,x,w
 if(J.xC(this.fN,a))return
 if(this.fN!=null){N.QM("").To("Uninstalling page: "+H.d(this.fN))
 this.fN.oV()
 J.Wf(this.bn)}N.QM("").To("Installing page: "+H.d(a))
 try{a.ak()}catch(y){x=H.Ru(y)
 z=x
-N.QM("").YX("Failed to install page: "+H.d(z))}x=this.bn
+N.QM("").hh("Failed to install page: "+H.d(z))}x=this.bn
 x.appendChild(a.gyF())
 w=W.r3("trace-view",null)
 this.HJ=w
 J.La(w,$.ax)
 x.appendChild(this.HJ)
 x=a
 w=this.fN
 if(this.gnz(this)&&!J.xC(w,x)){w=new T.qI(this,C.RG,w,x)
 w.$builtinTypeInfo=[null]
 this.nq(this,w)}this.fN=x},
@@ skipping 82 matching lines @@
 this.yF=F.Wi(this,C.GP,this.yF,z)}},
 Q0:function(a){if(J.xC(a,""))return
 this.i6.Nv.cv(a).ml(new G.mo(this)).OA(new G.Go5())},
 VU:function(a){return!0}},
 mo:{
 "^":"TpZ:12;a",
 $1:[function(a){J.h9(this.a.yF,a)},"$1",null,2,0,null,96,"call"],
 $isEH:true},
 Go5:{
 "^":"TpZ:12;",
-$1:[function(a){N.QM("").YX("ServiceObjectPage visit error: "+H.d(a))},"$1",null,2,0,null,2,"call"],
+$1:[function(a){N.QM("").hh("ServiceObjectPage visit error: "+H.d(a))},"$1",null,2,0,null,2,"call"],
 $isEH:true},
 t9:{
 "^":"OS;i6,yF,fz,Vg,fn",
 ak:function(){if(this.yF==null){var z=W.r3("class-tree",null)
 this.yF=F.Wi(this,C.GP,this.yF,z)}},
 Q0:function(a){a=J.ZZ(a,11)
 this.i6.Nv.cv(a).ml(new G.Hb(this)).OA(new G.ZaW())},
 VU:function(a){return J.co(a,"class-tree/")},
 static:{"^":"rjk"}},
 Hb:{
 "^":"TpZ:12;a",
 $1:[function(a){var z=this.a.yF
 if(z!=null)J.Rp(z,a)},"$1",null,2,0,null,97,"call"],
 $isEH:true},
 ZaW:{
 "^":"TpZ:12;",
-$1:[function(a){N.QM("").YX("ClassTreePage visit error: "+H.d(a))},"$1",null,2,0,null,2,"call"],
+$1:[function(a){N.QM("").hh("ClassTreePage visit error: "+H.d(a))},"$1",null,2,0,null,2,"call"],
 $isEH:true},
 Sy:{
 "^":"OS;i6,yF,fz,Vg,fn",
 ak:function(){if(this.yF==null){var z=W.r3("service-view",null)
 this.yF=F.Wi(this,C.GP,this.yF,z)}},
 Q0:function(a){var z,y
 z=H.Go(this.yF,"$isTi")
 y=this.i6.Pv
 z.Ll=J.NB(z,C.td,z.Ll,y)},
 VU:function(a){return J.co(a,"error/")}},
@@ skipping 11539 matching lines @@
 v=J.Lp(v)}else N.QM("").js(w)}},
 X2A:function(a,b,c){return this.Y6(C.EkO,a,b,c)},
 kS:function(a){return this.X2A(a,null,null)},
 TF:function(a,b,c){return this.Y6(C.t4,a,b,c)},
 J4:function(a){return this.TF(a,null,null)},
 DH:function(a,b,c){return this.Y6(C.IF,a,b,c)},
 To:function(a){return this.DH(a,null,null)},
 r0:function(a,b,c){return this.Y6(C.nT,a,b,c)},
 j2:function(a){return this.r0(a,null,null)},
 WB:function(a,b,c){return this.Y6(C.cd,a,b,c)},
-YX:function(a){return this.WB(a,null,null)},
+hh:function(a){return this.WB(a,null,null)},
 qX:function(){if($.RL||this.eT==null){var z=this.z3
 if(z==null){z=P.bK(null,null,!0,N.HV)
 this.z3=z}z.toString
 return H.VM(new P.Ik(z),[H.u3(z,0)])}else return N.QM("").qX()},
 js:function(a){var z=this.z3
 if(z!=null){if(z.YM>=4)H.vh(z.Pq())
 z.MW(a)}},
 QL:function(a,b,c){var z=this.eT
 if(z!=null)J.jd(z).u(0,this.oc,this)},
 $isTJ:true,
@@ skipping 57 matching lines @@
 else z=!1}else z=!1
 if(z)return
 P.FL(a.gOR().oc+": "+a.gFl().bu(0)+": "+H.d(J.Oh(a)))},"$1",null,2,0,null,169,"call"],
 $isEH:true},
 e547:{
 "^":"TpZ:12;",
 $1:[function(a){var z,y,x
 N.QM("").To("Initializing Polymer")
 try{A.Zw()}catch(y){x=H.Ru(y)
 z=x
-N.QM("").YX("Error initializing polymer: "+H.d(z))}},"$1",null,2,0,null,13,"call"],
+N.QM("").hh("Error initializing polymer: "+H.d(z))}},"$1",null,2,0,null,13,"call"],
 $isEH:true}}],["","",,N,{
 "^":"",
 qn:{
 "^":"V38;GC,OM,zv,Vg,fn,tB,Qf,Vg,fn,Vg,fn,IX,Bd,f4,bb,TT,MJ,OD,n7,kK,ZM,ZQ,qJ,wy",
 guc:function(a){return a.GC},
 suc:function(a,b){a.GC=this.ct(a,C.EP,a.GC,b)},
 god:function(a){return a.OM},
 sod:function(a,b){a.OM=this.ct(a,C.rB,a.OM,b)},
 geZ:function(a){return a.zv},
 seZ:function(a,b){a.zv=this.ct(a,C.tf,a.zv,b)},
@@ skipping 612 matching lines @@
 w=J.x(x)
 if(w.n(x,"\n".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\n"))
 else if(w.n(x,"\r".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\r"))
 else if(w.n(x,"\u000c".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\f"))
 else if(w.n(x,"\u0008".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\b"))
 else if(w.n(x,"\t".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\t"))
 else if(w.n(x,"\u000b".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\v"))
 else if(w.n(x,"$".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\$"))
 else if(w.n(x,"\\".charCodeAt(0)))C.Nm.FV(z,new J.IA("\\\\"))
 else if(w.n(x,"'".charCodeAt(0)))C.Nm.FV(z,new J.IA("'"))
-else if(w.C(x,32))C.Nm.FV(z,new J.IA("\\u"+H.d(x)))
+else if(w.C(x,32))C.Nm.FV(z,new J.IA("\\u"+C.yo.YX(w.WZ(x,16),4,"0")))
 else z.push(x)}if(c===!0)C.Nm.FV(z,new J.IA("..."))
 else z.push(C.yo.j("'",0))
 return P.HM(z)},function(a,b){return this.Rms(a,b,!1)},"hD","$2","$1","gRO",2,2,176,69,20,177],
 static:{ew:function(a){var z,y,x,w
 z=P.L5(null,null,null,P.qU,W.I0)
 y=P.qU
 y=H.VM(new V.qC(P.YM(null,null,null,y,null),null,null),[y,null])
 x=P.Fl(null,null)
 w=P.Fl(null,null)
 a.f4=[]
@@ skipping 3559 matching lines @@
 "^":"",
 Xm:[function(a,b){return J.FW(J.DA(a),J.DA(b))},"$2","E0",4,0,72],
 dV:function(a){switch(a){case"BoundedType":case"Instance":case"List":case"String":case"Type":case"TypeParameter":case"TypeRef":case"bool":case"double":case"int":case"null":return!0
 default:return!1}},
 rO:function(a){switch(a){case"BoundedType":case"Type":case"TypeParameter":case"TypeRef":return!0
 default:return!1}},
 Nl:function(a,b){var z,y,x,w,v,u,t,s,r,q,p,o,n,m,l
 if(b==null)return
 z=J.U6(b)
 z=z.t(b,"id")!=null&&z.t(b,"type")!=null
-if(!z)N.QM("").YX("Malformed service object: "+H.d(b))
+if(!z)N.QM("").hh("Malformed service object: "+H.d(b))
 z=J.U6(b)
 y=z.t(b,"type")
 x=J.Qe(y)
 if(x.nC(y,"@"))y=x.yn(y,1)
 if(z.t(b,"_vmType")!=null){z=z.t(b,"_vmType")
 x=J.Qe(z)
 w=x.nC(z,"@")?x.yn(z,1):z}else w=y
 switch(y){case"Class":z=D.xB
 x=[]
 x.$builtinTypeInfo=[z]
@@ skipping 267 matching lines @@
 gA3:function(){return this.Ts},
 gdW:function(){return this.Va},
 gU6:function(){return this.kU},
 gJW:function(){return this.l7},
 hQ:function(a,b){var z,y,x,w
 z={}
 z.a=null
 try{y=this.hb(a)
 z.a=y
 if(b!=null)J.kW(y,"_data",b)}catch(x){H.Ru(x)
-N.QM("").YX("Ignoring malformed event message: "+H.d(a))
-return}if(!J.xC(J.UQ(z.a,"type"),"ServiceEvent")){N.QM("").YX("Expected 'ServiceEvent' but found '"+H.d(J.UQ(z.a,"type"))+"'")
+N.QM("").hh("Ignoring malformed event message: "+H.d(a))
+return}if(!J.xC(J.UQ(z.a,"type"),"ServiceEvent")){N.QM("").hh("Expected 'ServiceEvent' but found '"+H.d(J.UQ(z.a,"type"))+"'")
 return}w=J.UQ(J.UQ(z.a,"isolate"),"id")
 this.wD(w).ml(new D.jy(z,this,w))},
 EM:function(a){return this.hQ(a,null)},
 BC:function(a){var z,y,x,w
 z=$.rc().R4(0,a)
 if(z==null)return
 y=z.pX
 x=y.input
 w=y.index
 if(0>=y.length)return H.e(y,0)
@@ skipping 69 matching lines @@
 this.uj.u(0,"vm",this)
 var z=P.EF(["id","vm","type","@VM"],null,null)
 this.eC(R.tB(z))},
 $iswv:true},
 O1w:{
 "^":"xm+Pi;",
 $isd3:true},
 jy:{
 "^":"TpZ:12;a,b,c",
 $1:[function(a){var z,y
-if(a==null)N.QM("").YX("Ignoring event with unknown isolate id: "+H.d(this.c))
+if(a==null)N.QM("").hh("Ignoring event with unknown isolate id: "+H.d(this.c))
 else{z=D.Nl(a,this.a.a)
 y=this.b.Rk
 if(y.YM>=4)H.vh(y.Pq())
 y.MW(z)}},"$1",null,2,0,null,210,"call"],
 $isEH:true},
 MZ:{
 "^":"TpZ:12;a,b",
 $1:[function(a){if(!J.x(a).$iswv)return
 return this.a.Qi.t(0,this.b)},"$1",null,2,0,null,121,"call"],
 $isEH:true},
@@ skipping 218 matching lines @@
 this.i9=F.Wi(this,C.wT,this.i9,y)
 y=z.t(b,"name")
 this.KT=F.Wi(this,C.YS,this.KT,y)
 y=z.t(b,"name")
 this.f5=F.Wi(this,C.KS,this.f5,y)
 if(c)return
 this.qu=!0
 this.yP=F.Wi(this,C.DY,this.yP,!1)
 this.Xb()
 D.kT(b,this)
-if(z.t(b,"rootLib")==null||z.t(b,"timers")==null||z.t(b,"heaps")==null){N.QM("").YX("Malformed 'Isolate' response: "+H.d(b))
+if(z.t(b,"rootLib")==null||z.t(b,"timers")==null||z.t(b,"heaps")==null){N.QM("").hh("Malformed 'Isolate' response: "+H.d(b))
 return}y=z.t(b,"rootLib")
 this.v9=F.Wi(this,C.eN,this.v9,y)
 if(z.t(b,"entry")!=null){y=z.t(b,"entry")
 this.cL=F.Wi(this,C.tP,this.cL,y)}if(z.t(b,"topFrame")!=null){y=z.t(b,"topFrame")
 this.zb=F.Wi(this,C.bc,this.zb,y)}else this.zb=F.Wi(this,C.bc,this.zb,null)
 x=z.t(b,"tagCounters")
 if(x!=null){y=J.U6(x)
 w=y.t(x,"names")
 v=y.t(x,"counters")
 y=J.U6(v)
@@ skipping 171 matching lines @@
 $0:[function(){this.b.hz=null},"$0",null,0,0,null,"call"],
 $isEH:true},
 ad:{
 "^":"TpZ:12;a,b,c",
 $1:[function(a){if(!!J.x(a).$iscn)J.UQ(J.de(this.b),J.bI(this.c,1)).sj9(!1)
 return this.a.Xb()},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 fw:{
 "^":"TpZ:12;a,b",
 $1:[function(a){var z,y
-if(!!J.x(a).$iscn)N.QM("").YX(a.LD)
+if(!!J.x(a).$iscn)N.QM("").hh(a.LD)
 z=this.a
 y=z.Jr
 if(y!=null&&y.gQ1()!=null&&J.xC(J.UQ(z.Jr.gQ1(),"id"),J.UQ(this.b,"id")))return z.VD(0)
 else return z.Xb()},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 G4:{
 "^":"TpZ:12;a",
-$1:[function(a){if(!!J.x(a).$iscn)N.QM("").YX(a.LD)
+$1:[function(a){if(!!J.x(a).$iscn)N.QM("").hh(a.LD)
 return this.a.VD(0)},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 LO:{
 "^":"TpZ:12;a",
-$1:[function(a){if(!!J.x(a).$iscn)N.QM("").YX(a.LD)
+$1:[function(a){if(!!J.x(a).$iscn)N.QM("").hh(a.LD)
 return this.a.VD(0)},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 qD:{
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-$1:[function(a){if(!!J.x(a).$iscn)N.QM("").YX(a.LD)
+$1:[function(a){if(!!J.x(a).$iscn)N.QM("").hh(a.LD)
 return this.a.VD(0)},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 A6:{
 "^":"TpZ:12;a",
-$1:[function(a){if(!!J.x(a).$iscn)N.QM("").YX(a.LD)
+$1:[function(a){if(!!J.x(a).$iscn)N.QM("").hh(a.LD)
 return this.a.VD(0)},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 xK:{
 "^":"TpZ:12;a",
-$1:[function(a){if(!!J.x(a).$iscn)N.QM("").YX(a.LD)
+$1:[function(a){if(!!J.x(a).$iscn)N.QM("").hh(a.LD)
 return this.a.VD(0)},"$1",null,2,0,null,121,"call"],
 $isEH:true},
 oq:{
 "^":"TpZ:12;a",
 $1:[function(a){var z,y,x
 z=J.x(a)
-if(!!z.$iscn){N.QM("").YX(a.LD)
+if(!!z.$iscn){N.QM("").hh(a.LD)
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 y.V1(0)
 for(z=J.mY(z.t(a,"members"));z.G();){x=z.gl()
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 $isEH:true},
 y1:{
 "^":"TpZ:12;a",
 $1:[function(a){var z=this.a
 return z.WO("metrics/vm",z.Sn)},"$1",null,2,0,null,13,"call"],
 $isEH:true},
@@ skipping 109 matching lines @@
 y=z.t(b,"kind")
 this.I0=F.Wi(this,C.Lc,this.I0,y)
 y=z.t(b,"message")
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 z=z.t(b,"response")
 this.IV=F.Wi(this,C.F3,this.IV,z)
 z="ServiceException "+H.d(this.I0)
 z=this.ct(this,C.YS,this.bN,z)
 this.bN=z
 this.GR=this.ct(this,C.KS,this.GR,z)},
+bu:[function(a){return"ServiceException("+H.d(this.LD)+")"},"$0","gCR",0,0,73],
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 w8F:{
 "^":"af+Pi;",
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 Mk:{
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 gja:function(a){return this.jo},
 sja:function(a,b){this.jo=F.Wi(this,C.ne,this.jo,b)},
@@ skipping 708 matching lines @@
 z=y[1]
 if(J.co(z,"0x"))z=J.ZZ(z,2)
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 return x}catch(w){H.Ru(w)
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 pj:function(a){var z,y,x,w,v
 z=this.u0
 if(!J.co(z,"j"))return
 y=this.lF()
 x=J.x(y)
-if(x.n(y,0)){N.QM("").YX("Could not determine jump address for "+H.d(z))
+if(x.n(y,0)){N.QM("").hh("Could not determine jump address for "+H.d(z))
 return}for(z=a.XG,w=0;w<z.length;++w){v=z[w]
 if(J.xC(v.gYu(),y)){z=this.dh
 if(this.gnz(this)&&!J.xC(z,v)){z=new T.qI(this,C.b5,z,v)
 z.$builtinTypeInfo=[null]
 this.nq(this,z)}this.dh=v
-return}}N.QM("").YX("Could not find instruction at "+x.WZ(y,16))},
+return}}N.QM("").hh("Could not find instruction at "+x.WZ(y,16))},
 $isQ4:true,
 static:{Tn:function(a,b){return C.CD.Sy(100*J.L9(a,b),2)+"%"}}},
 WAE:{
 "^":"a;uX",
 bu:[function(a){return this.uX},"$0","gCR",0,0,73],
 static:{"^":"Oci,l8R,WAg,yP0,Z7U",CQ:function(a){var z=J.x(a)
 if(z.n(a,"Native"))return C.Oc
 else if(z.n(a,"Dart"))return C.l8
 else if(z.n(a,"Collected"))return C.WA
 else if(z.n(a,"Reused"))return C.yP
@@ skipping 324 matching lines @@
 new P.iP(y,!1).EK()
 z.seX(y)
 this.e2()
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 if(y.YM===0){N.QM("").To("WebSocketVM connection opened: "+H.d(z.gw8()))
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 return}z=C.xr.iQ(a)
-if(z==null){N.QM("").YX("WebSocketVM got empty message")
+if(z==null){N.QM("").hh("WebSocketVM got empty message")
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-if(v==null){N.QM("").YX("Received unexpected message: "+H.d(z))
+if(v==null){N.QM("").hh("Received unexpected message: "+H.d(z))
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 a.V1(0)},
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 if(z.X5>0){N.QM("").To("Cancelling all pending requests.")
 this.ck(z)}z=this.WE
 if(z.X5>0){N.QM("").To("Cancelling all delayed requests.")
 this.ck(z)}},
@@ skipping 3880 matching lines @@
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