wtf

note-woj.js

N2=(x,y=x)=>new _N2(new Float32Array(2),x,y)

data=(kv,T)=>{
  let s=(T+''), sub=(s,f)=>s.replace(/(\w+)/g,f), kvs=kv.split(','), cg='',
  vec=(k,v)=>`${k.substr(1)}(v){let a=this._,i=${kvs.length-1};while(i-->0)a[i]${k[0]}=${v}; return this}`
  if(kvs[0]=='_') {
    '+p *pp -m /mm'.split(' ').forEach(k=> cg+=vec(k,'v')+'_'+vec(k,'v._[i]'))
    kvs.slice(1).forEach((k,i)=> cg+=`get ${k}(){return this._[${i}]}set ${k}(v){this._[${i}]=v}`) 
  }
  T=eval(sub(s,(m,k)=>kvs.includes(k)?`this.${k}`:k).replace('{\n',`{constructor(${kv}){${sub(kv, `this.$1=$1`)}}`+cg))(); this[T.name]=T
}

data('_,x,y', ({cos,sin,atan2,sqrt,PI}=Math,tr=2*PI)=>
class _N2 {
  get a(){return atan2(y,x)/tr}
  get v(){return sqrt(y**2+x**2)}
  turn(a,v){x=v*cos(a*tr);y=v*sin(a*tr); return this}
  set a(a){this.turn(a,this.v)}
  set v(v){this.v1(); this.pp(v)}  v1(){let v=this.v; if(v!=0)this.mm(v)}
  get __(){return N2(x,y)}
})

doc=document
el=(tag,...ee)=>{if(!tag.nodeType)tag=doc.createElement(tag)
  let e,c,k,rw; while(ee[0]&&!ee[0].nodeType){e=ee.shift()
    if(e.call){tag.append(c=new Text); e (v=>{c.textContent=v})}
    else for(k in e){c=tag.getAttributeNode(k),rw=lit(e[k]);
      rw(c? v=>{c.value=v} : v=>{tag[k]=v;tag.oninput=()=>e[k](tag.value)})}}
  tag.append(...ee);return tag
}
lit=x=> x.onvar!=NO? x : f=>f(x)

pass=undefined
NO=null
holey=(v,o={},k='x' ,onvar=[],rw=NO,me=NO)=>(rw=x=>{
  let r,f, fu
  //'i=0'赋值
  if(!x.call){if(x!==o[k]){o[k]=x; for(fu of onvar)fu(x)} return me}
  //'i++'关系: B=A (x=>x+1) 
  if(x.length>1)return ev=>rw(x(o[k],ev))
  if(pass===(r=x(o[k]))) {f=v=>x(v)}
  else {r=holey(r); f=v=>{r(x(v))} }
  onvar.push(f); return r
}, o[k]=v, me=hide(rw,onvar,()=>o[k]))
hide=(ㅤ,A,B ,f)=>(f=x=>ㅤ(x),f.onvar=A,f.__defineGetter__('v',f.toJSON=B), f)

口=holey

let A=口(0), B=A(x=>+x+1)
el(doc.body, el("div",{onclick:A((x,to)=>+x+1)}, el("input",{value:A}), el("u",B)))