bleh · microcosm.blue/star@6f35223

+1

star-lite/viz/dist/assets/index-8jzqULgS.css

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-1

star-lite/viz/dist/assets/index-Bco6LxvL.css

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+25

star-lite/viz/dist/assets/index-C84nv0nn.js

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break}f.push(l)}}return{snapshots:n,frozen:r.frozen,parentIndex:o,byteLog:r.byteLog||[],emitOutput:r.emitOutput||[],mode:t}}function Va(e){switch(e.type){case"init":return"idle — stream not yet read";case"read":return`read key "${e.key}" (layer ${e.keyLayer})`;case"growStack":return`grow stack to include layer ${e.layer}`;case"freezeSkipEmpty":return`cascade: layer ${e.layer} empty — skip`;case"freezeNode":return e.framePosition!==null&&e.framePosition!==void 0?`cascade: freeze layer ${e.layer} → CID ${e.cid}, frame at byte_log[${e.framePosition}], link into layer ${e.layer+1}`:`cascade: freeze layer ${e.layer} → CID ${e.cid}, link into layer ${e.layer+1}`;case"linkRecord":return e.framePosition!==null&&e.framePosition!==void 0?`link record "${e.key}" into layer ${e.keyLayer} (record CID ${e.recordCid}, byte_log[${e.framePosition}])`:`link record "${e.key}" into layer ${e.keyLayer} (record CID ${e.recordCid})`;case"streamEnd":return"stream end — final rollup";case"finalFreezeSkipEmpty":return`final rollup: layer ${e.layer} empty — skip`;case"finalFreezeNode":return e.framePosition!==null&&e.framePosition!==void 0?`final rollup: freeze layer ${e.layer} → CID ${e.cid}, frame at byte_log[${e.framePosition}], link into layer ${e.layer+1}`:`final rollup: freeze layer ${e.layer} → CID ${e.cid}, link into layer ${e.layer+1}`;case"rootCid":return`root CID: ${e.rootCid}`;case"emitFrame":return`emit byte_log[${e.framePos}] → output[${e.outputIdx}]`;case"carDone":return"CAR conversion complete";default:return e.type}}const Wa=[{key:"aa",layer:0},{key:"ab",layer:0},{key:"ac",layer:0},{key:"ad",layer:1},{key:"ae",layer:0},{key:"af",layer:0},{key:"ag",layer:0},{key:"ah",layer:1},{key:"ai",layer:0},{key:"aj",layer:2},{key:"ak",layer:0},{key:"al",layer:0},{key:"am",layer:1},{key:"an",layer:0},{key:"ao",layer:0},{key:"ap",layer:0}],Ga=[{key:"aa",layer:0},{key:"ab",layer:0},{key:"ac",layer:1},{key:"ad",layer:0},{key:"ae",layer:0}],Xa=[{key:"aa",layer:1},{key:"ab",layer:1},{key:"ac",layer:2},{key:"ad",layer:0},{key:"ae",layer:0}],Vn={small:Wa,tiny:Ga,emptyBottom:Xa},Ja=[42,108,0],Za=[1,113,18,32],Wn=36,ji=4096,Yi=830,Vi=1024*1024;function Gn(e,t){let r=0,n=1,i=t;for(;i<e.length;){const s=e[i++];if(r+=(s&127)*n,(s&128)===0){if(!Number.isSafeInteger(r))throw new Error("varint overflow");return[r,i-t]}if(n*=128,n>2**49)throw new Error("varint too long")}throw new Error("varint truncated at end of buffer")}function Xn(e){return Array.from(e,t=>t.toString(16).padStart(2,"0")).join("")}function Qa(e){const t=new Uint8Array(e);let r=0;if(t.length<3+Wn+1)throw new Error("file too short to contain a STAR-lite header");for(let u=0;u<3;u++)if(t[r+u]!==Ja[u])throw new Error(`bad magic at offset 0: expected 2a 6c 00, got ${Xn(t.slice(0,3))}`);r+=3;const n=t.slice(r,r+Wn);for(let u=0;u<4;u++)if(n[u]!==Za[u])throw new Error(`bad CID prefix: expected 01 71 12 20, got ${Xn(n.slice(0,4))}`);const i=n.slice(4);r+=Wn;const[s,o]=Gn(t,r);if(r+=o,s>ji)throw new Error(`partial commit cbor len ${s} exceeds max ${ji}`);if(r+s>t.length)throw new Error("truncated partial commit cbor");const f=s>0?t.slice(r,r+s):null;r+=s;const l=new TextDecoder("utf-8",{fatal:!0}),c=[];for(;r<t.length;){const[u,h]=Gn(t,r);if(r+=h,u>Yi)throw new Error(`record ${c.length}: key len ${u} exceeds max ${Yi}`);if(r+u>t.length)throw new Error(`record ${c.length}: truncated key`);let v;try{v=l.decode(t.slice(r,r+u))}catch{throw new Error(`record ${c.length}: key is not valid utf-8`)}r+=u;const[_,p]=Gn(t,r);if(r+=p,_>Vi)throw new Error(`record ${c.length}: record len ${_} exceeds max ${Vi}`);if(r+_>t.length)throw new Error(`record ${c.length}: truncated record body`);if(r+=_,c.length>0&&v<=c[c.length-1].key)throw new Error(`record ${c.length}: key "${v}" not in strict lex order after "${c[c.length-1].key}"`);c.push({key:v,recordSize:_})}return{headerCidDigest:i,headerCidHex:Xn(i),partialCommit:f,records:c}}new TextEncoder;const Wi=new TextDecoder,el=e=>new Uint8Array(e),tl=el,Re=String.fromCharCode,rl=(e,t,r)=>{if(r<4){if(r<2){if(r===0)return"";const te=e[t];return te&128?null:Re(te)}const k=e[t],b=e[t+1];if((k|b)&128)return null;if(r===2)return Re(k,b);const B=e[t+2];return B&128?null:Re(k,b,B)}const n=e[t],i=e[t+1],s=e[t+2],o=e[t+3];if((n|i|s|o)&128)return null;if(r<8){if(r===4)return Re(n,i,s,o);const k=e[t+4];if(k&128)return null;if(r===5)return Re(n,i,s,o,k);const b=e[t+5];if(b&128)return null;if(r===6)return Re(n,i,s,o,k,b);const B=e[t+6];return B&128?null:Re(n,i,s,o,k,b,B)}const f=e[t+4],l=e[t+5],c=e[t+6],u=e[t+7];if((f|l|c|u)&128)return null;if(r<12){if(r===8)return Re(n,i,s,o,f,l,c,u);const k=e[t+8];if(k&128)return null;if(r===9)return Re(n,i,s,o,f,l,c,u,k);const b=e[t+9];if(b&128)return null;if(r===10)return Re(n,i,s,o,f,l,c,u,k,b);const B=e[t+10];return B&128?null:Re(n,i,s,o,f,l,c,u,k,b,B)}const h=e[t+8],v=e[t+9],_=e[t+10],p=e[t+11];if((h|v|_|p)&128)return null;if(r===12)return Re(n,i,s,o,f,l,c,u,h,v,_,p);const w=e[t+12];if(w&128)return null;if(r===13)return Re(n,i,s,o,f,l,c,u,h,v,_,p,w);const g=e[t+13];if(g&128)return null;if(r===14)return Re(n,i,s,o,f,l,c,u,h,v,_,p,w,g);const m=e[t+14];return m&128?null:Re(n,i,s,o,f,l,c,u,h,v,_,p,w,g,m)},nl=(e,t=0,r=e.length)=>{if(r<=15){const n=rl(e,t,r);if(n!==null)return n}return t===0&&r===e.length?Wi.decode(e):Wi.decode(e.subarray(t,t+r))},il=(e,t,r)=>n=>{const i=(1<<t)-1;let s="",o=0,f=0;for(let l=0;l<n.length;++l)for(f=f<<8|n[l],o+=8;o>t;)o-=t,s+=e[i&f>>o];if(o!==0&&(s+=e[i&f<<t-o]),r)for(;(s.length*t&7)!==0;)s+="=";return s},sl=(e,t,r)=>{const n={};for(let i=0;i<e.length;++i)n[e[i]]=i;return i=>{let s=i.length;for(;r&&i[s-1]==="=";)--s;const o=tl(s*t/8|0);let f=0,l=0,c=0;for(let u=0;u<s;++u){const h=n[i[u]];if(h===void 0)throw new SyntaxError("invalid base string");l=l<<t|h,f+=t,f>=8&&(f-=8,o[c++]=255&l>>f)}if(f>=t||(255&l<<8-f)!==0)throw new SyntaxError("unexpected end of data");return o}},ol=e=>Uint8Array.fromBase64(e,{alphabet:"base64",lastChunkHandling:"loose"}),al=e=>e.toBase64({alphabet:"base64",omitPadding:!0}),Vs="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",ll=sl(Vs,6,!1),fl=il(Vs,6,!1),Ws="fromBase64"in Uint8Array,cl=Ws?ol:ll,ul=Ws?al:fl,dl="abcdefghijklmnopqrstuvwxyz234567",hl=(()=>{const e=new Uint8Array(32);for(let t=0;t<32;t++)e[t]=dl.charCodeAt(t);return e})(),vn=String.fromCharCode,Gs=e=>{const t=e.length,r=t/5|0,n=t-r*5,i=hl;let s="",o=0;const f=r/2|0;for(let l=0;l<f;l++){const c=e[o],u=e[o+1],h=e[o+2],v=e[o+3],_=e[o+4],p=e[o+5],w=e[o+6],g=e[o+7],m=e[o+8],k=e[o+9];s+=vn(i[c>>>3],i[(c<<2|u>>>6)&31],i[u>>>1&31],i[(u<<4|h>>>4)&31],i[(h<<1|v>>>7)&31],i[v>>>2&31],i[(v<<3|_>>>5)&31],i[_&31],i[p>>>3],i[(p<<2|w>>>6)&31],i[w>>>1&31],i[(w<<4|g>>>4)&31],i[(g<<1|m>>>7)&31],i[m>>>2&31],i[(m<<3|k>>>5)&31],i[k&31]),o+=10}if(r&1){const l=e[o],c=e[o+1],u=e[o+2],h=e[o+3],v=e[o+4];s+=vn(i[l>>>3],i[(l<<2|c>>>6)&31],i[c>>>1&31],i[(c<<4|u>>>4)&31],i[(u<<1|h>>>7)&31],i[h>>>2&31],i[(h<<3|v>>>5)&31],i[v&31]),o+=5}if(n>0){let l=0,c=0;for(let u=o;u<t;u++)l=l<<8|e[u],c+=8;for(;c>=5;)c-=5,s+=vn(i[l>>>c&31]);c>0&&(s+=vn(i[l<<5-c&31]))}return s},ci=1,Xs=18,Js=85,Zs=113,vl=e=>{if(e.length<36)throw new RangeError("cid too short");const t=e[0],r=e[1],n=e[2],i=e[3];if(t!==ci)throw new RangeError(`incorrect cid version (got v${t})`);if(r!==Zs&&r!==Js)throw new RangeError(`incorrect cid codec (got 0x${r.toString(16)})`);if(n!==Xs)throw new RangeError(`incorrect cid digest codec (got 0x${n.toString(16)})`);if(i!==32)throw new RangeError(`incorrect cid digest size (got ${i})`);return[{version:ci,codec:r,digest:{codec:n,contents:e.subarray(4,36)},bytes:e.subarray(0,36)},e.subarray(36)]},pl=e=>{const[t,r]=vl(e);if(r.length!==0)throw new RangeError("cid bytes includes remainder");return t},Qs=e=>`b${Gs(e.bytes)}`,_l=e=>{if(e.length!==37||e[0]!==0)throw new SyntaxError("invalid binary cid");return pl(e.subarray(1))},yl=Symbol.for("@atcute/cid-link-wrapper");var Qi;Qi=yl;class eo{constructor(t){Ie(this,Qi,!0);Ie(this,"bytes");this.bytes=t}get $link(){const t=`b${Gs(this.bytes)}`;return Object.defineProperty(this,"$link",{value:t,enumerable:!0}),t}toJSON(){return{$link:this.$link}}}const gl=Symbol.for("@atcute/bytes-wrapper");var es;es=gl;class to{constructor(t){Ie(this,"buf");Ie(this,es,!0);this.buf=t}get $bytes(){return ul(this.buf)}toJSON(){return{$bytes:this.$bytes}}}const ml=e=>new to(e),wl=e=>e instanceof to?e.buf:cl(e.$bytes),ui=(e,t)=>{if(t<24)return t;let r;switch(t){case 24:{if(r=En(e),r<24)throw new TypeError("non-canonical argument encoding");break}case 25:{if(r=bl(e),r<256)throw new TypeError("non-canonical argument encoding");break}case 26:{if(r=di(e),r<65536)throw new TypeError("non-canonical argument encoding");break}case 27:{if(r=kl(e),r<4294967296)throw new TypeError("non-canonical argument encoding");break}default:throw new Error(`invalid argument encoding; got ${t}`)}return r},xl=e=>{const r=(e.v??(e.v=new DataView(e.b.buffer,e.b.byteOffset,e.b.byteLength))).getFloat64(e.p);return e.p+=8,r},En=e=>e.b[e.p++],bl=e=>{let t=e.p;const r=e.b,n=r[t++]<<8|r[t++];return e.p=t,n},di=e=>{let t=e.p;const r=e.b,n=(r[t++]<<24|r[t++]<<16|r[t++]<<8|r[t++])>>>0;return e.p=t,n},kl=e=>{const t=di(e),r=di(e);if(t>2097151)throw new RangeError("can't decode integers beyond safe integer range");return t*2**32+r},ro=(e,t)=>{const r=nl(e.b,e.p,t);return e.p+=t,r},El=(e,t)=>{const r=e.b.subarray(e.p,e.p+=t);return ml(r)},Sl=(e,t)=>{const r=_l(e.b.subarray(e.p,e.p+=t));return new eo(r.bytes)},Gi=e=>{const t=En(e),r=t>>5;if(r!==3)throw new TypeError(`expected map to only have string keys; got type ${r}`);const n=t&31,i=n<24?n:ui(e,n);return ro(e,i)},Al=e=>{const t=e.length,r={b:e,v:null,p:0};let n=null,i;e:for(;r.p<t;){const s=En(r),o=s>>5,f=s&31,l=o===7?0:f<24?f:ui(r,f);switch(o){case 0:{i=l;break}case 1:{i=-1-l;break}case 2:{i=El(r,l);break}case 3:{i=ro(r,l);break}case 4:{if(l>0){n={t:1,c:i=new Array(l),k:null,r:l,n};continue e}i=[];break}case 5:{if(i={},l>0){const c=Gi(r);n={t:0,c:i,k:c,r:l,n};continue e}break}case 6:{switch(l){case 42:{const c=En(r),u=c>>5,h=c&31;if(u!==2)throw new TypeError(`expected cid-link to be type 2 (bytes); got type ${u}`);const v=ui(r,h);i=Sl(r,v);break}default:throw new TypeError(`unsupported tag; got ${l}`)}break}case 7:{switch(f){case 20:case 21:{i=f===21;break}case 22:{i=null;break}case 27:{i=xl(r);break}default:throw new 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n=v,{done:!1,value:{cid:l,bytes:_,entryStart:i,entryEnd:v,cidStart:f,cidEnd:u,bytesStart:u,bytesEnd:v}}},[Symbol.iterator](){return this}}},[Symbol.iterator](){return this.iterate()}}},Ll=(e,t)=>{const r=t,{value:n,nextOffset:i}=no(e,t,8);if(n===0)throw new RangeError("invalid car header; length=0");const s=i,o=s+n;if(o>e.length)throw new RangeError("unexpected end of data");const f=hi(e.subarray(s,o));if(!Rl(f))throw new TypeError("expected a car v1 archive");return{header:{data:f,headerStart:r,headerEnd:o,dataStart:s,dataEnd:o},nextOffset:o}},Ml=(e,t)=>{const r=t+36;if(r>e.length)throw new RangeError("unexpected end of data");const n=e.subarray(t,r),i=n[0],s=n[1],o=n[2],f=n[3];if(i!==ci)throw new RangeError(`incorrect cid version (got v${i})`);if(s!==Zs&&s!==Js)throw new RangeError(`incorrect cid codec (got 0x${s.toString(16)})`);if(o!==Xs)throw new RangeError(`incorrect cid digest type (got 0x${o.toString(16)})`);if(f!==32)throw new RangeError(`incorrect cid digest size (got 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svelte-1n46o8q"> </p>'),pf=Zt('<p class="msg muted svelte-1n46o8q"><code class="svelte-1n46o8q"> </code></p>'),_f=Zt(`<p class="svelte-1n46o8q"><strong>CAR mode:</strong> the <em>byte_log</em> strip below the stream shows CARv1 frames 3 + in <em>creation order</em> — each record and each frozen MST node gets framed and 4 + appended. The <em>output</em> strip shows the same frames re-ordered into CAR 5 + stream-order (preorder MST traversal) by the root's emit plan, after the root is 6 + frozen. The dashed marker on byte_log shows the next frame the emit plan reads — its 7 + non-monotonic motion is exactly the random access that buffering avoids.</p> <p class="svelte-1n46o8q">Between byte_log and the output strip, <em>subtree spans</em> grow as the algorithm 8 + runs: each frozen subtree's emit_plan covers a contiguous range of byte_log positions 9 + (from its earliest contributing record up to the node's own frame), so we can draw it 10 + as a bar the moment it freezes. Smaller L0 spans get folded into wider L1 spans when 11 + their parent freezes, eventually rolling up into a single root span covering the 12 + entire byte_log — at that point the smaller spans dim away, since they've been 13 + absorbed into the final plan.</p> <p class="svelte-1n46o8q">During the emit phase, the root bracket — the final plan — is walked linearly. 14 + The amber playhead on the output strip is the linear scan position. For each step, 15 + the plan tells us which byte_log entry to fetch: a dashed line drops from the 16 + byte_log frame down to the root bracket at the same x, showing the plan→byte_log 17 + fetch. The byte_log indicator jumps non-monotonically (random access) while the 18 + output playhead advances linearly (linear write).</p>`,1),yf=Zt(`<main><header><h1> </h1> <p>step <span class="ev"> </span> · <span class="ev"> </span> </p></header> <div class="mode-toggle svelte-1n46o8q">mode: <label class="svelte-1n46o8q"><input type="radio" class="svelte-1n46o8q"/> verify</label> <label class="svelte-1n46o8q"><input type="radio" class="svelte-1n46o8q"/> CAR conversion</label></div> <div class="dataset-picker svelte-1n46o8q"><!> <span class="spacer svelte-1n46o8q"></span> <label class="file-button svelte-1n46o8q"><input type="file" accept=".star,.car,application/octet-stream" hidden=""/> load .star or .car file…</label></div> <!> <!> <!> <!> <footer class="svelte-1n46o8q"><p class="svelte-1n46o8q">Stream is at the bottom (lex-ordered keys, layer tags below). The cursor sweeps left to 19 + right. Each MST node lives in its layer's row, spanning the keys it covers. Active 20 + (in-stack) nodes glow cyan; frozen nodes fade to gray once their CID has been linked into 21 + a parent. The final root node lights up amber.</p> <p class="svelte-1n46o8q">For loaded .star files, layers come from <code class="svelte-1n46o8q">floor(leading_zero_bits(sha256(key)) / 2)</code> (atproto MST fanout 4). 22 + Record CIDs and node CIDs in this viz are placeholders — visualizing the structure 23 + doesn't require the actual DAG-CBOR encoding step.</p> <p class="svelte-1n46o8q">Node labels: <code class="svelte-1n46o8q">Ne</code> = N direct entries (key/value pairs at this layer); <code class="svelte-1n46o8q">Ns</code> = N subtree links (left + per-entry right) into lower layers. 24 + A non-root MST node always has at least 1 entry; subtree count is bounded by <code class="svelte-1n46o8q">entries + 1</code>.</p> <!></footer></main>`);function gf(e,t){Tn(t,!0);const r=[],n=[];let i=ye("small"),s=ye("verify"),o=ye(null),f=ye(null),l=ye(null);function c(A){return A.length>=3&&A[0]===42&&A[1]===108&&A[2]===0?"star":"car"}let u=C(()=>a(i)==="custom"&&a(o)?a(o).dataset:Vn[a(i)]),h=C(()=>Ya(a(u),a(s))),v=C(()=>a(h).snapshots),_=ye(0),p=ye(!1),w=ye(1),g=C(()=>a(v)[Math.min(a(_),a(v).length-1)]);oi(()=>{a(i),a(s),N(_,0),N(p,!1)}),oi(()=>{if(!a(p))return;const A=Math.max(60,800/a(w)),$=setInterval(()=>{a(_)<a(v).length-1?N(_,a(_)+1):N(p,!1)},A);return()=>clearInterval($)});function m(A){N(_,Math.max(0,Math.min(a(v).length-1,a(_)+A)),!0)}function k(){N(_,0),N(p,!1)}async function b(A){const $=A.target.files[0];if($){N(l,null),N(f,`parsing ${$.name}…`);try{const oe=await $.arrayBuffer(),We=new Uint8Array(oe),ft=c(We);let ct,Ft;if(ft==="star"){const G=Qa(oe);ct=G.records,Ft=`STAR header CID digest: ${G.headerCidHex}`}else{const G=Dl(oe);ct=G.records,Ft=`CAR commit CID: ${G.commitCidString} · MST root: ${G.dataCidString} · ${G.blockCount} blocks`}N(f,`${ft.toUpperCase()}: computing layers for ${ct.length} keys…`);const $r=await Fl(ct.map(G=>G.key)),Kr=ct.map((G,Kt)=>({key:G.key,layer:$r[Kt]}));N(o,{label:$.name,dataset:Kr,headerLabel:Ft,sourceFormat:ft},!0),N(i,"custom");const $t=$r.reduce((G,Kt)=>(G[Kt]=(G[Kt]??0)+1,G),{}),fn=Object.keys($t).sort((G,Kt)=>+G-+Kt).map(G=>`L${G}:${$t[G]}`).join(" ");N(f,`loaded ${$.name} (${ft.toUpperCase()}) — ${Kr.length} keys (${fn})`)}catch(oe){console.error(oe),N(l,`failed to load ${$.name}: ${oe.message}`),N(f,null)}finally{A.target.value=""}}}let B=C(()=>[...Object.keys(Vn).map(A=>({value:A,label:`${A} (${Vn[A].length})`})),...a(o)?[{value:"custom",label:`${a(o).label} (${a(o).dataset.length})`}]:[]]);var te=yf(),ke=L(te),J=L(ke),je=L(J),ot=E(J,2),he=E(L(ot)),qt=L(he),Ye=E(he,2),ze=L(Ye),zt=E(Ye),Z=E(ke,2),Ve=E(L(Z)),at=L(Ve);at.value=at.__value="verify";var yr=E(Ve,2),we=L(yr);we.value=we.__value="car";var Bt=E(Z,2),Nr=L(Bt);pt(Nr,17,()=>a(B),er,(A,$)=>{var oe=df(),We=L(oe),ft,ct=E(We);K(()=>{ft!==(ft=a($).value)&&(We.value=(We.__value=a($).value)??""),Q(ct,` ${a($).label??""}`)}),Hn(n,[],We,()=>(a($).value,a(i)),Ft=>N(i,Ft)),z(A,oe)});var Et=E(Nr,4),Pn=L(Et),gr=E(Bt,2);{var St=A=>{var $=hf(),oe=L($);K(()=>Q(oe,a(l))),z(A,$)},Be=A=>{var $=vf(),oe=L($);K(()=>Q(oe,a(f))),z(A,$)};xe(gr,A=>{a(l)?A(St):a(f)&&A(Be,1)})}var Nt=E(gr,2);{var Ee=A=>{var $=pf(),oe=L($),We=L(oe);K(()=>Q(We,a(o).headerLabel)),z(A,$)};xe(Nt,A=>{a(i)==="custom"&&a(o)&&A(Ee)})}var lt=E(Nt,2);ff(lt,{get snapshot(){return a(g)},get dataset(){return a(u)},get frozenList(){return a(h).frozen},get parentIndex(){return a(h).parentIndex},get byteLog(){return a(h).byteLog},get emitOutput(){return a(h).emitOutput},get mode(){return a(s)}});var Fr=E(lt,2);uf(Fr,{get total(){return a(v).length},onStep:m,onReset:k,get i(){return a(_)},set i(A){N(_,A,!0)},get playing(){return a(p)},set playing(A){N(p,A,!0)},get speed(){return a(w)},set speed(A){N(w,A,!0)}});var ln=E(Fr,2),Dn=E(L(ln),6);{var qn=A=>{var $=_f();z(A,$)};xe(Dn,A=>{a(s)==="car"&&A(qn)})}K(A=>{Q(je,`STAR-lite — ${a(s)==="verify"?"verification":"CAR conversion"}`),Q(qt,`${a(_)+1} / ${a(v).length??""}`),Q(ze,a(g).event.type),Q(zt,` · 25 + ${A??""}`)},[()=>Va(a(g).event)]),Hn(r,[],at,()=>a(s),A=>N(s,A)),Hn(r,[],we,()=>a(s),A=>N(s,A)),Yr("change",Pn,b),z(e,te),Ln()}Hs(["change"]);Ca(gf,{target:document.getElementById("app")});

-14

star-lite/viz/dist/assets/index-sTicUE30.js

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B=A(G);V((ne,Z)=>{y(G,"x",f(St)-28),y(G,"y",ne),y(B,"x",f(St)),y(B,"y",Z)},[()=>Ge(D),()=>Ge(D)+o/2+4]),z(ye,H)};Oe(q,ye=>{var H;f(C).isEmpty?((H=f(_e))==null?void 0:H.kind)==="skipLayer"&&f(_e).layer===D&&ye(ze,1):ye(re)})}z(w,I)});var Te=A(Je);y(Te,"y1",a-4);var ot=A(Te);_t(ot,17,()=>t.dataset,qt,(w,C,D)=>{var I=Ll();let q;var re=M(I);y(re,"height",n);var ze=A(re);{var ye=G=>{var B=Il(),ne=at(B),Z=M(ne),T=A(ne),Y=M(T);V((N,Ie)=>{y(ne,"x",N),y(ne,"y",f(nt)+18),ee(Z,f(C).key),y(T,"x",Ie),y(T,"y",f(nt)+n+12),ee(Y,`L${f(C).layer??""}`)},[()=>W(D),()=>W(D)]),z(G,B)},H=G=>{var B=Ml();let ne;V((Z,T,Y,N)=>{y(B,"x1",Z),y(B,"x2",T),y(B,"y1",f(nt)+n),y(B,"y2",Y),ne=ya(B,"",ne,N)},[()=>S(D)+f(g)/2,()=>S(D)+f(g)/2,()=>f(nt)+n+Math.min(i,4+f(C).layer*4),()=>({stroke:Hr(f(C).layer+1)||"#6cd0ff"})]),z(G,B)};Oe(ze,G=>{f(x)?G(ye):f(C).layer>0&&G(H,1)})}V((G,B)=>{var ne;q=Cr(I,0,"stream-cell svelte-qc7y49",null,q,{past:D<t.snapshot.cursor,current:D===t.snapshot.cursor,future:D>t.snapshot.cursor,"pulse-cell":((ne=f(_e))==null?void 0:ne.kind)==="streamCell"&&f(_e).idx===D}),y(re,"x",G),y(re,"y",f(nt)),y(re,"width",f(g)),y(re,"fill",B)},[()=>S(D),()=>Hr(f(C).layer)]),z(w,I)});var $t=A(ot);{var Vr=w=>{var C=ql(),D=at(C);y(D,"x",4);var I=M(D),q=A(D);y(q,"x",r-2),y(q,"height",c);var re=A(q);_t(re,17,()=>f(le),Z=>Z.position,(Z,T)=>{var Y=Pl(),N=at(Y);y(N,"height",c);let Ie;var ie=A(N);{var Me=X=>{var he=Ol(),ve=M(he);V(Ee=>{y(he,"x",Ee),y(he,"y",f(it)+c/2+4),ee(ve,f(T).kind==="record"?"r":f(T).isRoot?"★":`n${f(T).layer}`)},[()=>st(f(T).position)+f(ke)/2]),z(X,he)};Oe(ie,X=>{f(ke)>=24&&X(Me)})}V((X,he,ve,Ee)=>{var Ze;y(N,"x",X),y(N,"y",f(it)),y(N,"width",he),y(N,"fill",ve),y(N,"stroke",Ee),y(N,"stroke-width",f(ke)>=4?.8:.3),Ie=Cr(N,0,"frame svelte-qc7y49",null,Ie,{"pulse-frame":((Ze=f(_e))==null?void 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0:Wr.kind)==="emit"&&((Gr=f(_e))==null?void 0:Gr.outputIdx)===Y,isRoot:f(N).isRoot})},[()=>st(Y),()=>Math.max(1,f(ke)-.5),()=>jr(f(N)),()=>Yr(f(N))]),z(Z,Ie)}),V(()=>{y(D,"y",f(it)-3),ee(I,`byte_log (creation order, ${f(le).length??""}/${f(br)??""})`),y(q,"y",f(it)),y(q,"width",f(xe)-2*r+4),y(H,"y",f(pt)-3),ee(G,`output (stream order, ${f(Re).length??""}/${t.emitOutput.length??""})`),y(B,"y",f(pt)),y(B,"width",f(xe)-2*r+4)}),z(w,C)};Oe($t,w=>{t.mode==="car"&&w(Vr)})}ka(Sr,w=>F(Xe,w),()=>f(Xe)),V(()=>{y(E,"width",f(xe)),y(E,"height",f(bn)),y(Te,"x1",f(St)),y(Te,"x2",f(St)),y(Te,"y2",f(nt)+n+i+4)}),z(e,Sr),yn()}var Kl=Dt('<div class="controls svelte-1y71c66"><button title="reset to start" class="svelte-1y71c66">⏮</button> <button title="step back" class="svelte-1y71c66">◀</button> <button class="play svelte-1y71c66"> </button> <button title="step forward" class="svelte-1y71c66">▶</button> <input class="scrub svelte-1y71c66" type="range" min="0"/> <label class="speed svelte-1y71c66">speed <input type="range" min="0.25" max="4" step="0.25" class="svelte-1y71c66"/> <span class="svelte-1y71c66"> </span></label> <span class="counter svelte-1y71c66"> </span></div>');function Bl(e,t){_n(t,!0);let r=Ln(t,"i"),n=Ln(t,"playing"),i=Ln(t,"speed");var s=Kl(),o=M(s),l=A(o,2),a=A(l,2),c=M(a),u=A(a,2),v=A(u,2),p=A(v,2),_=A(M(p)),h=A(_,2),m=M(h),b=A(p,2),g=M(b);V(x=>{y(a,"title",n()?"pause":"play"),ee(c,n()?"⏸":"▶"),y(v,"max",t.total-1),ee(m,`${x??""}×`),ee(g,`${r()+1} / ${t.total??""}`)},[()=>i().toFixed(2)]),Rr("click",o,function(...x){var S;(S=t.onReset)==null||S.apply(this,x)}),Rr("click",l,()=>t.onStep(-1)),Rr("click",a,()=>n(!n())),Rr("click",u,()=>t.onStep(1)),Ci(v,r),Ci(_,i),z(e,s),yn()}As(["click"]);var Hl=Dt('<label class="svelte-1n46o8q"><input type="radio" class="svelte-1n46o8q"/> </label>'),Ul=Dt('<p class="msg err svelte-1n46o8q"> </p>'),jl=Dt('<p class="msg ok svelte-1n46o8q"> </p>'),Yl=Dt('<p class="msg muted svelte-1n46o8q"><code class="svelte-1n46o8q"> </code></p>'),Vl=Dt(`<p class="svelte-1n46o8q"><strong>CAR mode:</strong> the <em>byte_log</em> strip below the stream shows CARv1 frames 3 - in <em>creation order</em> — each record and each frozen MST node gets framed and 4 - appended. The <em>output</em> strip shows the same frames re-ordered into CAR 5 - stream-order (preorder MST traversal) by the root's emit plan, after the root is 6 - frozen. The dashed marker on byte_log shows the next frame the emit plan reads — its 7 - non-monotonic motion is exactly the random access that buffering avoids.</p>`),Wl=Dt(`<main><header><h1> </h1> <p>step <span class="ev"> </span> · <span class="ev"> </span> </p></header> <div class="mode-toggle svelte-1n46o8q">mode: <label class="svelte-1n46o8q"><input type="radio" class="svelte-1n46o8q"/> verify</label> <label class="svelte-1n46o8q"><input type="radio" class="svelte-1n46o8q"/> CAR conversion</label></div> <div class="dataset-picker svelte-1n46o8q"><!> <span class="spacer svelte-1n46o8q"></span> <label class="file-button svelte-1n46o8q"><input type="file" accept=".star,.car,application/octet-stream" hidden=""/> load .star or .car file…</label></div> <!> <!> <!> <!> <footer class="svelte-1n46o8q"><p class="svelte-1n46o8q">Stream is at the bottom (lex-ordered keys, layer tags below). The cursor sweeps left to 8 - right. Each MST node lives in its layer's row, spanning the keys it covers. Active 9 - (in-stack) nodes glow cyan; frozen nodes fade to gray once their CID has been linked into 10 - a parent. The final root node lights up amber.</p> <p class="svelte-1n46o8q">For loaded .star files, layers come from <code class="svelte-1n46o8q">floor(leading_zero_bits(sha256(key)) / 2)</code> (atproto MST fanout 4). 11 - Record CIDs and node CIDs in this viz are placeholders — visualizing the structure 12 - doesn't require the actual DAG-CBOR encoding step.</p> <p class="svelte-1n46o8q">Node labels: <code class="svelte-1n46o8q">Ne</code> = N direct entries (key/value pairs at this layer); <code class="svelte-1n46o8q">Ns</code> = N subtree links (left + per-entry right) into lower layers. 13 - A non-root MST node always has at least 1 entry; subtree count is bounded by <code class="svelte-1n46o8q">entries + 1</code>.</p> <!></footer></main>`);function Gl(e,t){_n(t,!0);const r=[],n=[];let i=fe("small"),s=fe("verify"),o=fe(null),l=fe(null),a=fe(null);function c(E){return E.length>=3&&E[0]===42&&E[1]===108&&E[2]===0?"star":"car"}let u=$(()=>f(i)==="custom"&&f(o)?f(o).dataset:On[f(i)]),v=$(()=>Ca(f(u),f(s))),p=$(()=>f(v).snapshots),_=fe(0),h=fe(!1),m=fe(1),b=$(()=>f(p)[Math.min(f(_),f(p).length-1)]);Yn(()=>{f(i),f(s),F(_,0),F(h,!1)}),Yn(()=>{if(!f(h))return;const E=Math.max(60,800/f(m)),K=setInterval(()=>{f(_)<f(p).length-1?F(_,f(_)+1):F(h,!1)},E);return()=>clearInterval(K)});function g(E){F(_,Math.max(0,Math.min(f(p).length-1,f(_)+E)),!0)}function x(){F(_,0),F(h,!1)}async function S(E){const K=E.target.files[0];if(K){F(a,null),F(l,`parsing ${K.name}…`);try{const oe=await K.arrayBuffer(),Je=new Uint8Array(oe),Te=c(Je);let ot,$t;if(Te==="star"){const I=Pa(oe);ot=I.records,$t=`STAR header CID digest: ${I.headerCidHex}`}else{const I=_l(oe);ot=I.records,$t=`CAR commit CID: ${I.commitCidString} · MST root: ${I.dataCidString} · ${I.blockCount} blocks`}F(l,`${Te.toUpperCase()}: computing layers for ${ot.length} keys…`);const Vr=await bl(ot.map(I=>I.key)),w=ot.map((I,q)=>({key:I.key,layer:Vr[q]}));F(o,{label:K.name,dataset:w,headerLabel:$t,sourceFormat:Te},!0),F(i,"custom");const C=Vr.reduce((I,q)=>(I[q]=(I[q]??0)+1,I),{}),D=Object.keys(C).sort((I,q)=>+I-+q).map(I=>`L${I}:${C[I]}`).join(" ");F(l,`loaded ${K.name} (${Te.toUpperCase()}) — ${w.length} keys (${D})`)}catch(oe){console.error(oe),F(a,`failed to load ${K.name}: ${oe.message}`),F(l,null)}finally{E.target.value=""}}}let j=$(()=>[...Object.keys(On).map(E=>({value:E,label:`${E} (${On[E].length})`})),...f(o)?[{value:"custom",label:`${f(o).label} (${f(o).dataset.length})`}]:[]]);var W=Wl(),xe=M(W),Fe=M(xe),le=M(Fe),Re=A(Fe,2),rr=A(M(Re)),wn=M(rr),nr=A(rr,2),nt=M(nr),br=A(nr),ke=A(xe,2),it=A(M(ke)),pt=M(it);pt.value=pt.__value="verify";var bn=A(it,2),Ge=M(bn);Ge.value=Ge.__value="car";var st=A(ke,2),St=M(st);_t(St,17,()=>f(j),qt,(E,K)=>{var oe=Hl(),Je=M(oe),Te,ot=A(Je);V(()=>{Te!==(Te=f(K).value)&&(Je.value=(Je.__value=f(K).value)??""),ee(ot,` ${f(K).label??""}`)}),Tn(n,[],Je,()=>(f(K).value,f(i)),$t=>F(i,$t)),z(E,oe)});var xr=A(St,4),_e=M(xr),Xe=A(st,2);{var Br=E=>{var K=Ul(),oe=M(K);V(()=>ee(oe,f(a))),z(E,K)},Hr=E=>{var K=jl(),oe=M(K);V(()=>ee(oe,f(l))),z(E,K)};Oe(Xe,E=>{f(a)?E(Br):f(l)&&E(Hr,1)})}var Ur=A(Xe,2);{var xn=E=>{var K=Yl(),oe=M(K),Je=M(oe);V(()=>ee(Je,f(o).headerLabel)),z(E,K)};Oe(Ur,E=>{f(i)==="custom"&&f(o)&&E(xn)})}var kr=A(Ur,2);zl(kr,{get snapshot(){return f(b)},get dataset(){return f(u)},get frozenList(){return f(v).frozen},get byteLog(){return f(v).byteLog},get emitOutput(){return f(v).emitOutput},get mode(){return f(s)}});var Er=A(kr,2);Bl(Er,{get total(){return f(p).length},onStep:g,onReset:x,get i(){return f(_)},set i(E){F(_,E,!0)},get playing(){return f(h)},set playing(E){F(h,E,!0)},get speed(){return f(m)},set speed(E){F(m,E,!0)}});var jr=A(Er,2),Yr=A(M(jr),6);{var Sr=E=>{var K=Vl();z(E,K)};Oe(Yr,E=>{f(s)==="car"&&E(Sr)})}V(E=>{ee(le,`STAR-lite — ${f(s)==="verify"?"verification":"CAR conversion"}`),ee(wn,`${f(_)+1} / ${f(p).length??""}`),ee(nt,f(b).event.type),ee(br,` · 14 - ${E??""}`)},[()=>Ra(f(b).event)]),Tn(r,[],pt,()=>f(s),E=>F(s,E)),Tn(r,[],Ge,()=>f(s),E=>F(s,E)),Rr("change",_e,S),z(e,W),yn()}As(["change"]);la(Gl,{target:document.getElementById("app")});

+2 -2

star-lite/viz/dist/index.html

··· 4 4 <meta charset="UTF-8" /> 5 5 <meta name="viewport" content="width=device-width, initial-scale=1.0" /> 6 6 <title>STAR-lite verification viz</title> 7 - <script type="module" crossorigin src="./assets/index-sTicUE30.js"></script> 8 - <link rel="stylesheet" crossorigin href="./assets/index-Bco6LxvL.css"> 7 + <script type="module" crossorigin src="./assets/index-C84nv0nn.js"></script> 8 + <link rel="stylesheet" crossorigin href="./assets/index-8jzqULgS.css"> 9 9 </head> 10 10 <body> 11 11 <div id="app"></div>

+18

star-lite/viz/src/App.svelte

··· 162 162 snapshot={snap} 163 163 {dataset} 164 164 frozenList={result.frozen} 165 + parentIndex={result.parentIndex} 165 166 byteLog={result.byteLog} 166 167 emitOutput={result.emitOutput} 167 168 {mode} ··· 202 203 stream-order (preorder MST traversal) by the root's emit plan, after the root is 203 204 frozen. The dashed marker on byte_log shows the next frame the emit plan reads — its 204 205 non-monotonic motion is exactly the random access that buffering avoids. 206 + </p> 207 + <p> 208 + Between byte_log and the output strip, <em>subtree spans</em> grow as the algorithm 209 + runs: each frozen subtree's emit_plan covers a contiguous range of byte_log positions 210 + (from its earliest contributing record up to the node's own frame), so we can draw it 211 + as a bar the moment it freezes. Smaller L0 spans get folded into wider L1 spans when 212 + their parent freezes, eventually rolling up into a single root span covering the 213 + entire byte_log — at that point the smaller spans dim away, since they've been 214 + absorbed into the final plan. 215 + </p> 216 + <p> 217 + During the emit phase, the root bracket — the final plan — is walked linearly. 218 + The amber playhead on the output strip is the linear scan position. For each step, 219 + the plan tells us which byte_log entry to fetch: a dashed line drops from the 220 + byte_log frame down to the root bracket at the same x, showing the plan→byte_log 221 + fetch. The byte_log indicator jumps non-monotonically (random access) while the 222 + output playhead advances linearly (linear write). 205 223 </p> 206 224 {/if} 207 225 </footer>

+97 -20

star-lite/viz/src/components/Viz.svelte

··· 1 1 <script> 2 - let { snapshot, dataset, frozenList, byteLog, emitOutput, mode } = $props(); 2 + let { snapshot, dataset, frozenList, parentIndex, byteLog, emitOutput, mode } = $props(); 3 3 4 4 // layout constants 5 5 const PAD_X = 24; ··· 55 55 totalFrames === 0 ? 0 : (svgWidth - 2 * PAD_X) / totalFrames, 56 56 ); 57 57 let byteLogY = $derived(streamY + KEY_H + KEY_LABEL_H + STRIP_GAP + STRIP_LABEL_H); 58 - let outputY = $derived(byteLogY + STRIP_H + STRIP_GAP + STRIP_LABEL_H); 58 + 59 + const BRACKET_H = 10; 60 + const BRACKET_GAP = 2; 61 + // brackets sit between byte_log and output. L0 closest to byte_log; root at the bottom, 62 + // just above the output strip. 63 + let bracketsTopY = $derived(byteLogY + STRIP_H + 8); 64 + function bracketY(L) { 65 + return bracketsTopY + L * (BRACKET_H + BRACKET_GAP); 66 + } 67 + let bracketsBottomY = $derived(bracketY(maxLayer) + BRACKET_H); 68 + 69 + let outputY = $derived(bracketsBottomY + STRIP_GAP + STRIP_LABEL_H); 70 + 59 71 let svgHeight = $derived( 60 72 mode === 'car' 61 73 ? outputY + STRIP_H + 16 62 74 : streamY + KEY_H + KEY_LABEL_H + 12, 63 75 ); 64 76 77 + // most recently emitted byte_log position (for pulsing brackets that contain it) 78 + let currentEmitFramePos = $derived.by(() => { 79 + if (mode !== 'car' || snapshot.emitCount === 0) return null; 80 + return emitOutput[snapshot.emitCount - 1]; 81 + }); 82 + 65 83 function yLayerTop(L) { 66 84 return TOP_PAD + (maxLayer - L) * (LAYER_H + LAYER_GAP); 67 85 } ··· 75 93 : xLeft(snapshot.cursor), 76 94 ); 77 95 78 - // during emit phase: where will the next byteLog read happen? 79 - let nextEmitFramePos = $derived.by(() => { 80 - if (mode !== 'car') return null; 81 - if (snapshot.emitCount === 0 || snapshot.emitCount >= emitOutput.length) return null; 82 - return emitOutput[snapshot.emitCount]; 83 - }); 84 - 85 96 let pulse = $derived.by(() => { 86 97 const ev = snapshot.event; 87 98 if (!ev) return null; ··· 100 111 $effect(() => { 101 112 if (!wrapEl) return; 102 113 let target = cursorX; 103 - if (mode === 'car' && pulse?.kind === 'emit') { 104 - // during emit phase: track the byteLog position being read 105 - target = frameXInLog(pulse.framePos); 114 + if (mode === 'car' && snapshot.emitCount > 0) { 115 + // during emit phase: follow the linear playhead on the output strip 116 + target = frameXInLog(snapshot.emitCount - 1) + FRAME_W / 2; 106 117 } 107 118 const left = wrapEl.scrollLeft; 108 119 const right = left + wrapEl.clientWidth; ··· 284 295 </text> 285 296 {/if} 286 297 {/each} 287 - {#if nextEmitFramePos !== null} 298 +  301 + {#if snapshot.emitCount > 0} 302 + {@const lastFramePos = emitOutput[snapshot.emitCount - 1]} 288 303 <line 289 - x1={frameXInLog(nextEmitFramePos) + FRAME_W / 2} 290 - x2={frameXInLog(nextEmitFramePos) + FRAME_W / 2} 304 + x1={frameXInLog(lastFramePos) + FRAME_W / 2} 305 + x2={frameXInLog(lastFramePos) + FRAME_W / 2} 291 306 y1={byteLogY - 4} 292 - y2={byteLogY + STRIP_H + 4} 293 - class="next-emit-marker" 307 + y2={bracketsBottomY + 2} 308 + class="bytelog-read" 294 309 /> 295 310 {/if} 296 311 312 +  314 + <text x={4} y={bracketsTopY - 2} class="strip-label">subtree spans (emit_plan extent in byte_log order)</text> 315 + {#each frozen as f, i (f.cid)} 316 + {#if f.framePosition !== null && f.firstByteLogIdx !== null} 317 + {@const span = f.framePosition - f.firstByteLogIdx + 1} 318 + {@const x1 = frameXInLog(f.firstByteLogIdx)} 319 + {@const x2 = frameXInLog(f.framePosition) + FRAME_W} 320 + {@const y = bracketY(f.layer)} 321 + {@const parentIdx = parentIndex?.[i] ?? -1} 322 + {@const merged = parentIdx !== -1 && parentIdx < frozen.length} 323 + {@const isActivePlan = 324 + currentEmitFramePos !== null && 325 + !merged && 326 + currentEmitFramePos >= f.firstByteLogIdx && 327 + currentEmitFramePos <= f.framePosition} 328 + <rect 329 + x={x1} 330 + y={y} 331 + width={Math.max(1, x2 - x1)} 332 + height={BRACKET_H - 1} 333 + rx="2" 334 + fill={frameFill(f)} 335 + stroke={frameStroke(f)} 336 + stroke-width="0.8" 337 + class="emit-bracket" 338 + class:isRoot={f.isRoot} 339 + class:merged={merged} 340 + class:active-plan={isActivePlan} 341 + class:pulse-frozen={pulse?.kind === 'frozenCid' && pulse.cid === f.cid} 342 + /> 343 + {#if f.isRoot && x2 - x1 >= 50} 344 + <text x={x1 + 5} y={y + BRACKET_H - 2} class="bracket-label">root · {f.emitPlan?.length ?? span}f</text> 345 + {/if} 346 + {/if} 347 + {/each} 348 + 297 349  298 350 <text x={4} y={outputY - 3} class="strip-label"> 299 351 output (stream order, {emitVisible.length}/{emitOutput.length}) ··· 325 377 </text> 326 378 {/if} 327 379 {/each} 380 + 381 +  382 + {#if snapshot.emitCount > 0} 383 + {@const lastOutputIdx = snapshot.emitCount - 1} 384 + <line 385 + x1={frameXInLog(lastOutputIdx) + FRAME_W / 2} 386 + x2={frameXInLog(lastOutputIdx) + FRAME_W / 2} 387 + y1={outputY - 6} 388 + y2={outputY + STRIP_H + 6} 389 + class="output-playhead" 390 + /> 391 + {/if} 328 392 {/if} 329 393 </svg> 330 394 </div> ··· 389 453 .frame { transition: opacity 80ms; } 390 454 .frame.pulse-frame { stroke-width: 2 !important; stroke: #ffd86c !important; } 391 455 .frame-label { fill: #d4d8e0; font: 9px ui-monospace, monospace; pointer-events: none; } 392 - .next-emit-marker { 456 + .emit-bracket { opacity: 0.85; transition: opacity 120ms; } 457 + .emit-bracket.isRoot { opacity: 0.95; } 458 + .emit-bracket.merged { opacity: 0.18; } 459 + .emit-bracket.active-plan { opacity: 1; stroke: #ffd86c !important; stroke-width: 1.5 !important; } 460 + .emit-bracket.pulse-frozen { opacity: 1; stroke: #ffd86c !important; stroke-width: 1.5 !important; } 461 + 462 + .output-playhead { stroke: #ffd86c; stroke-width: 1.5; opacity: 0.9; } 463 + .bytelog-read { 393 464 stroke: #ffd86c; 394 - stroke-width: 1.5; 465 + stroke-width: 1.2; 466 + opacity: 0.75; 395 467 stroke-dasharray: 2 2; 396 - opacity: 0.8; 468 + pointer-events: none; 469 + } 470 + .bracket-label { 471 + fill: #d4d8e0; 472 + font: 9px ui-monospace, monospace; 473 + pointer-events: none; 397 474 } 398 475 </style>

+50 -2

star-lite/viz/src/lib/algorithm.js

··· 25 25 this.leftEmitPlan = null; // CAR mode: emit plan of the left subtree 26 26 this.firstKeyIdx = null; 27 27 this.lastKeyIdx = null; 28 + this.firstByteLogIdx = null; // CAR mode: earliest byte_log position contributing to this subtree 28 29 } 29 30 isEmpty() { 30 31 return this.leftSubtree === null && this.entries.length === 0; ··· 35 36 this.leftEmitPlan = null; 36 37 this.firstKeyIdx = null; 37 38 this.lastKeyIdx = null; 39 + this.firstByteLogIdx = null; 38 40 } 39 41 linkRecord(key, recordCid, keyIdx, framePosition) { 40 42 this.entries.push({ ··· 43 45 }); 44 46 if (this.firstKeyIdx === null) this.firstKeyIdx = keyIdx; 45 47 this.lastKeyIdx = keyIdx; 48 + if (this.firstByteLogIdx === null && framePosition !== null) { 49 + this.firstByteLogIdx = framePosition; 50 + } 46 51 } 47 - linkSubtree(cid, spanFirst, spanLast, emitPlan) { 52 + linkSubtree(cid, spanFirst, spanLast, emitPlan, subtreeFirstByteLogIdx) { 48 53 if (this.entries.length === 0) { 49 54 this.leftSubtree = cid; 50 55 this.leftEmitPlan = emitPlan; ··· 55 60 } 56 61 if (this.firstKeyIdx === null || spanFirst < this.firstKeyIdx) this.firstKeyIdx = spanFirst; 57 62 if (this.lastKeyIdx === null || spanLast > this.lastKeyIdx) this.lastKeyIdx = spanLast; 63 + if (subtreeFirstByteLogIdx !== null && subtreeFirstByteLogIdx !== undefined) { 64 + if (this.firstByteLogIdx === null || subtreeFirstByteLogIdx < this.firstByteLogIdx) { 65 + this.firstByteLogIdx = subtreeFirstByteLogIdx; 66 + } 67 + } 58 68 } 59 69 snapshot() { 60 70 return { ··· 62 72 leftSubtree: this.leftSubtree, 63 73 firstKeyIdx: this.firstKeyIdx, 64 74 lastKeyIdx: this.lastKeyIdx, 75 + firstByteLogIdx: this.firstByteLogIdx, 65 76 isEmpty: this.isEmpty(), 66 77 }; 67 78 } ··· 101 112 const cid = fakeCid(`n${layer}`); 102 113 let framePosition = null; 103 114 let emitPlan = null; 115 + let firstByteLogIdx = null; 104 116 if (mode === 'car') { 105 117 framePosition = state.byteLog.length; 106 118 state.byteLog.push({ ··· 111 123 cid, 112 124 }); 113 125 emitPlan = buildSubtreeEmitPlan(node, framePosition); 126 + // node.firstByteLogIdx tracks the earliest contributing frame; if (somehow) the node 127 + // has nothing earlier than its own frame, fall back to framePosition. 128 + firstByteLogIdx = node.firstByteLogIdx !== null ? node.firstByteLogIdx : framePosition; 114 129 } 115 130 const frozenRecord = { 116 131 layer, ··· 121 136 cid, 122 137 framePosition, 123 138 emitPlan, 139 + firstByteLogIdx, 124 140 }; 125 141 state.frozen.push(frozenRecord); 126 - parent.linkSubtree(cid, node.firstKeyIdx, node.lastKeyIdx, emitPlan); 142 + parent.linkSubtree(cid, node.firstKeyIdx, node.lastKeyIdx, emitPlan, firstByteLogIdx); 127 143 node.reset(); 128 144 return [snap(state, { 129 145 type: finalCascade ? 'finalFreezeNode' : 'freezeNode', ··· 195 211 if (!root.isEmpty()) { 196 212 rootCid = fakeCid('root'); 197 213 let rootFramePosition = null; 214 + let rootFirstByteLogIdx = null; 198 215 if (mode === 'car') { 199 216 rootFramePosition = state.byteLog.length; 200 217 state.byteLog.push({ ··· 206 223 isRoot: true, 207 224 }); 208 225 rootEmitPlan = buildSubtreeEmitPlan(root, rootFramePosition); 226 + rootFirstByteLogIdx = root.firstByteLogIdx !== null ? root.firstByteLogIdx : rootFramePosition; 209 227 } 210 228 state.frozen.push({ 211 229 layer: topL, ··· 216 234 cid: rootCid, 217 235 framePosition: rootFramePosition, 218 236 emitPlan: rootEmitPlan, 237 + firstByteLogIdx: rootFirstByteLogIdx, 219 238 isRoot: true, 220 239 }); 221 240 root.reset(); ··· 239 258 out.push(snap(state, { type: 'carDone' })); 240 259 } 241 260 261 + // for each frozen subtree, find the index of its parent (smallest later subtree at a 262 + // higher layer whose byte_log range contains this one). children always freeze before 263 + // parents and nest cleanly, so a single linear pass with a stack does it in O(n). 264 + const parentIndex = new Array(state.frozen.length).fill(-1); 265 + if (mode === 'car') { 266 + const open = []; 267 + for (let i = 0; i < state.frozen.length; i++) { 268 + const f = state.frozen[i]; 269 + while (open.length > 0) { 270 + const top = open[open.length - 1]; 271 + const o = state.frozen[top]; 272 + if ( 273 + o.layer < f.layer && 274 + f.firstByteLogIdx !== null && 275 + o.firstByteLogIdx !== null && 276 + f.firstByteLogIdx <= o.firstByteLogIdx && 277 + f.framePosition >= o.framePosition 278 + ) { 279 + parentIndex[top] = i; 280 + open.pop(); 281 + } else { 282 + break; 283 + } 284 + } 285 + open.push(i); 286 + } 287 + } 288 + 242 289 return { 243 290 snapshots: out, 244 291 frozen: state.frozen, 292 + parentIndex, 245 293 byteLog: state.byteLog || [], 246 294 emitOutput: state.emitOutput || [], 247 295 mode,

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