@uwdata/flechette/dist/flechette.min.js

Fast, lightweight access to Apache Arrow data.

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this.buf[t]}set(t,e){this.prep(e),this.buf[e]=t}write(t,e){this.prep(e+t.length),this.buf.set(t,e)}}function Pn(){return new Hn}class Hn extends Yn{set(t){const e=t>>3;this.prep(e),this.buf[e]|=1<<t%8}}class Wn{constructor(t,e){this.type=t,this.ctx=e,this.batchClass=e.batchType(t)}init(){return this.index=-1,this}set(t,e){return this.index=e,!1}done(){return null}batch(){const t=new this.batchClass(this.done());return this.init(),t}}class Gn extends Wn{constructor(t,e){super(t,e)}init(){return this.nullCount=0,this.validity=Pn(),super.init()}set(t,e){this.index=e;const n=null!=t;return n?this.validity.set(e):this.nullCount++,n}done(){const{index:t,nullCount:e,type:n,validity:s}=this;return{length:t+1,nullCount:e,type:n,validity:e?s.array(1+(t>>3)):new h(0)}}}function Jn(){const t=new Map,e=new Set;return{get(n,s){const r=n.id;if(r>=0&&t.has(r))return t.get(r);{const i=function(t,e){const n=Object.create(null),s=e.builder(t.dictionary),r=[];s.init();let 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this.offsets=$n(this.type.offsets),this.values=$n(),this.pos=0,super.init()}set(t,e){const{offsets:n,values:s,toOffset:r}=this;super.set(t,e)&&(s.write(t,this.pos),this.pos+=t.length),n.set(r(this.pos),e+1)}done(){return{...super.done(),offsets:this.offsets.array(this.index+2),values:this.values.array(this.pos+1)}}}class Zn extends Gn{constructor(t,e){super(t,e)}init(){return this.values=Pn(),super.init()}set(t,e){super.set(t,e),t&&this.values.set(e)}done(){return{...super.done(),values:this.values.array(1+(this.index>>3))}}}class ts extends Gn{constructor(t,e){super(t,e),this.scale=10**t.scale,this.stride=t.bitWidth>>6}init(){return this.values=$n(this.type.values),super.init()}set(t,e){const{scale:n,stride:s,values:r}=this;super.set(t,e)&&(r.prep((e+1)*s),function(t,e,n,s,r){const i="bigint"==typeof t?t:Nt(Math.trunc(t*r));e[n]=i,s>1&&(e[n+1]=i>>64n,s>2&&(e[n+2]=i>>128n,e[n+3]=i>>192n))}(t,r.buf,e*s,s,n))}done(){const{index:t,stride:e,values:n}=this;return{...super.done(),values:n.array((t+1)*e)}}}class es extends Gn{constructor(t,e){super(t,e),this.stride=t.stride}init(){return this.values=$n(),super.init()}set(t,e){super.set(t,e)&&this.values.write(t,e*this.stride)}done(){const{stride:t,values:e}=this;return{...super.done(),values:e.array(t*(this.index+1))}}}class ns extends Gn{constructor(t,e){super(t,e),this.child=e.builder(this.type.children[0].type),this.stride=t.stride}init(){return this.child.init(),super.init()}set(t,e){const{child:n,stride:s}=this,r=e*s;if(super.set(t,e))for(let e=0;e<s;++e)n.set(t[e],r+e);else n.index=r+s}done(){const{child:t}=this;return{...super.done(),children:[t.batch()]}}}class ss extends Gn{init(){return this.values=$n(this.type.values),super.init()}set(t,e){if(super.set(t,e)){const n=e<<1;this.values.set(t[0],n),this.values.set(t[1],n+1)}}done(){return{...super.done(),values:this.values.array(this.index+1<<1)}}}class rs extends Gn{init(){return this.values=$n(),super.init()}set(t,e){super.set(t,e)&&this.values.write(function([t,e,n]){return Et[0]=t,Et[1]=e,Ot[1]=Nt(n),Dt}(t),e<<4)}done(){return{...super.done(),values:this.values.array(this.index+1<<4)}}}class is extends Gn{constructor(t,e,n){super(t,e),this.child=n}init(){this.child.init();const t=this.type.offsets;return this.offsets=$n(t),this.toOffset=St(t),this.pos=0,super.init()}done(){return{...super.done(),offsets:this.offsets.array(this.index+2),children:[this.child.batch()]}}}class as extends is{constructor(t,e){super(t,e,e.builder(t.children[0].type))}set(t,e){const{child:n,offsets:s,toOffset:r}=this;super.set(t,e)&&t.forEach((t=>n.set(t,this.pos++))),s.set(r(this.pos),e+1)}}class cs extends Gn{constructor(t,e){super(t,e),this.children=t.children.map((t=>e.builder(t.type)))}init(){return this.children.forEach((t=>t.init())),super.init()}done(){const{children:t}=this;return t.forEach((t=>t.index=this.index)),{...super.done(),children:t.map((t=>t.batch()))}}}class us extends cs{constructor(t,e){super(t,e),this.setters=this.children.map(((e,n)=>{const s=t.children[n].name;return(t,n)=>e.set(t?.[s],n)}))}set(t,e){super.set(t,e);const n=this.setters;for(let s=0;s<n.length;++s)n[s](t,e)}}class os extends is{constructor(t,e){super(t,e,new ds(t.children[0].type,e))}set(t,e){const{child:n,offsets:s,toOffset:r}=this;if(super.set(t,e))for(const e of t)n.set(e,this.pos++);s.set(r(this.pos),e+1)}}class ds extends cs{set(t,e){super.set(t,e);const[n,s]=this.children;n.set(t[0],e),s.set(t[1],e)}}const ls={};class hs extends Wn{constructor(t,e){super(t,e),this.children=t.children.map((t=>e.builder(t.type)))}init(){return this.pos=0,this.key=null,this.value=ls,this.children.forEach((t=>t.init())),super.init()}next(){const[t,e]=this.children;t.set(this.index+1,this.pos),e.set(this.value,this.pos++)}set(t,e){if(t!==this.value){const e=$t(t);e!==this.key&&(this.key&&this.next(),this.key=e,this.value=t)}this.index=e}done(){this.next();const{children:t,index:e,type:n}=this;return{length:e+1,nullCount:0,type:n,children:t.map((t=>t.batch()))}}}class fs extends Wn{constructor(t,e){super(t,e),this.children=t.children.map((t=>e.builder(t.type))),this.typeMap=t.typeMap,this.lookup=t.typeIdForValue}init(){return this.nullCount=0,this.typeIds=$n(b),this.children.forEach((t=>t.init())),super.init()}set(t,e){const{children:n,lookup:s,typeMap:r,typeIds:i}=this;this.index=e;const a=s(t,e),c=n[r[a]];i.set(a,e),null==t&&++this.nullCount,this.update(t,e,c)}done(){const{children:t,nullCount:e,type:n,typeIds:s}=this,r=this.index+1;return{length:r,nullCount:e,type:n,typeIds:s.array(r),children:t.map((t=>t.batch()))}}}class ys extends fs{update(t,e,n){n.set(t,e),this.children.forEach((t=>{t!==n&&t.set(null,e)}))}}class ps extends fs{init(){return this.offsets=$n(this.type.offsets),super.init()}update(t,e,n){const s=n.index+1;n.set(t,s),this.offsets.set(s,e)}done(){return{...super.done(),offsets:this.offsets.array(this.index+1)}}}class bs extends Qn{set(t,e){super.set(t&&_t(t),e)}}class Is extends Gn{constructor(t,e){super(t,e),this.values=$n(t.values)}init(){return this.values=$n(this.type.values),super.init()}set(t,e){super.set(t,e)&&this.values.set(t,e)}done(){return{...super.done(),values:this.values.array(this.index+1)}}}class gs extends Is{set(t,e){super.set(null==t?t:Nt(t),e)}}class vs extends Is{constructor(t,e,n){super(t,e),this.transform=n}set(t,e){super.set(null==t?t:this.transform(t),e)}}function ws(t={},e=Jn()){return{batchType:e=>tn(e,t),builder(t){return ms(t,this)},dictionary(t){return e.get(t,this)},finish:()=>e.finish(t)}}function ms(t,e=ws()){const{typeId:n}=t;switch(n){case a.Int:case 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Xn(t,e)}var s,r;throw new Error(U(n))}function xs(t,e,n={},s){const r="function"==typeof t[Symbol.iterator]?e=>{for(const n of t)e(n)}:t;e??=qn(r);const{maxBatchRows:i=1/0,...c}=n;let u;if(e.typeId===a.Null){let t=0;r((()=>++t)),u=function(t,e,n){const s=[],r=e=>new oe({length:e,nullCount:e,type:t}),i=Math.floor(e/n);for(let t=0;t<i;++t)s.push(r(n));const a=e%n;a&&s.push(r(a));return s}(e,t,i)}else{const t=ws(c,s),n=ms(e,t).init(),a=t=>u.push(t.batch());u=[];let o=0;r((t=>{n.set(t,o++),o>=i&&(a(n),o=0)})),o&&a(n),t.finish()}return new Qe(u,e)}function Os(t,e,n={},s){return!e&&L(t)?function(t,{maxBatchRows:e,useBigInt:n}){const s=t.constructor,r=function(t){switch(t){case w:return K();case m:return Q();case b:return $();case I:return Y();case g:return P();case v:return H();case h:return W();case f:return G();case y:return J();case p:return X()}}(s),i=t.length,a=Math.min(e||1/0,i),c=Math.floor(i/a),u=[],o=D(s)&&!n?de:ae,d=(e,n)=>u.push(new o({length:n-e,nullCount:0,type:r,validity:new 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