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  explain(); // Clear
  setExplain = doc.doexplain.classList.toggle('selected')
             ? explain : (e=>e);
}

let makePlot,setPlot,initPlot,didInitPlot;
let startPlot = () => {
  if (!makePlot) [makePlot,initPlot,setPlot] = run(
    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34,0,0,0,21,32,1,4,0,46,0,3,27,0,5,20,0,46,0,23,27,21,27,27,11,2,0,49,34,0,3,0,40,0,10,26,16,27,34,0,2,19,7,0,33,0,45,0,14,0,45,34,0,1,27,0,1,0,45,0,8,0,2,0,42,0,0,26,21,27,20,27,7,32,0,1,0,7,16,0,40,0,6,26,0,2,0,18,21,0,63,0,3,16,17,33,0,3,48,6,34,0,1,0,55,34,0,3,11,2,0,46,0,1,27,0,47,0,41,0,6,0,22,0,5,21,26,27,16,7,34,0,1,34,0,2,16,7,0,19,0,36,0,1,26,34,0,2,23,0,36,0,3,26,34,0,1,21,7,34,0,1,0,8,20,7,34,0,1,0,52,0,50,0,38,0,21,26,27,0,99,17,0,20,16,0,21,16,0,31,0,47,0,71,27,16,7]
   ,[runtime[0],runtime[1],runtime[2],runtime[3],runtime[4],runtime[6],runtime[7],runtime[8],runtime[9],runtime[10],runtime[11],runtime[12],runtime[13],runtime[14],runtime[15],runtime[16],runtime[18],runtime[19],runtime[20],runtime[21],runtime[22],runtime[23],runtime[24],runtime[25],runtime[26],runtime[27],runtime[28],runtime[31],runtime[32],runtime[33],runtime[36],runtime[37],runtime[38],runtime[42],runtime[43],runtime[44],runtime[45],runtime[46],runtime[47],runtime[48],runtime[50],runtime[51],runtime[52],runtime[53],runtime[54],runtime[55],runtime[56],runtime[57],runtime[58],runtime[59],runtime[60],runtime[62],1,2,3,0,-Infinity,Infinity,10,0.5,384,-1,1e300,5000000000000000,4,1.5,' ','0','=','|','\0','M',str("t"),str("<"),str(">"),str("</"),str("  "),str("/>"),str("-."),str(" "),str("=\'"),str("\'"),str("x"),str("y"),str("svg"),str("viewBox"),str("line"),str("class=Paren|stroke=currentColor|stroke-width=1"),str("class=red|style=fill:none|stroke-width=1"),str("class=red|r=4"),str("class=code|stroke-width=1|rx=5"),str("g"),str("font-family=BQN,monospace|font-size=18px"),str("path"),str("d"),str("•Plot: 𝕨 and 𝕩 must consist of rows of numbers"),str("•Plot: 𝕨 and 𝕩 must have the same length"),str("•Plot: invalid depth mixing"),str("scatter"),str("L "),str("circle"),str("cx"),str("cy"),str("rect"),str("width"),str("height"),str("M "),str("VH")]
   ,[[0,1,0],[0,0,1],[0,0,[[],[2]]],[0,0,3],[0,0,4],[0,0,5],[0,0,6],[0,0,[[],[7]]],[0,0,8],[0,0,[[],[9]]],[0,0,10],[0,0,11],[0,0,12],[0,0,13],[0,0,14],[0,0,15],[1,0,[[],[16]]],[0,0,17],[0,0,[[],[18]]],[0,0,19],[1,1,20],[0,0,21],[0,0,[[],[22]]],[0,0,23],[0,0,24],[0,0,25]]
   ,[[0,28],[360,4],[447,8],[567,3],[580,10],[826,3],[836,3],[846,3],[862,4],[913,3],[938,3],[949,3],[961,3],[1085,4],[1173,13],[1739,3],[1782,5],[1794,3],[1833,4],[1923,4],[2019,2],[2049,4],[2106,3],[2114,3],[2135,3],[2142,3]]
  );
  if (!didInitPlot) { initPlot('\0'); didInitPlot=1; }
}
sysvals.plot = (x,w) => {
  startPlot();
  doc.explain.innerHTML = makePlot(x,w).map(l=>l.join("")).join("\n");
  setExplain = () => doc.explain.innerHTML = '';
  return '\0';
}
sysvals.setplot = (x,w) => { startPlot(); setPlot(x,w); }

let highlightErr = (s, e) => {
  let h = doc.highlight;
  h.style.height = doc.code.clientHeight+"px";
  let scroll = doc.code.onscroll = () => {
    h.scrollTop  = doc.code.scrollTop;
    h.scrollLeft = doc.code.scrollLeft;
  }

  clearHighlight();
  let w=e.message, is;
  while (w && (w.loc||(e.kind!=='!'&&w.sh&&w.sh[0]===2))
           && w.src.join('')===s.join('')) { [is,w]=w; }
  if (is) {
    let n, pair=0;
    if (!is.sh) { n=1; is=[is]; }
    else { n=is.sh[0]; pair=is.sh.length>1; if(pair)n*=2; }
    let l=0, sl = j=>s.slice(l,l=j).join('');
    for (let i=0; i<n; ) {
      let b=is[i++]; h.append(sl(b));
      if (pair) for (b=is[i++]; i<n&&b+1>=is[i]; i+=2) b=is[i+1];
      let m = document.createElement('mark');
      m.innerText = sl(b+1); h.append(m);
    }
    h.append(sl());
  }
  scroll();
}

let keymode=0; // 1 for prefix
let prefix='\\';
let modified=ev=>ev.shiftKey||ev.ctrlKey||ev.altKey||ev.metaKey;
doc.code.onkeydown = ev => {
  let k = ev.which;
  if (16<=k && k<=20) {
    return;
  } if (k==13 && modified(ev)) { // *-enter
    repl(); return false;
  } if (keymode) {
    keymode = 0;
    doc.kb.classList.remove('prefix');
    let c = keys[ev.key];
    if (c) return typeChar(ev.target, c, ev);
  } else if (ev.key==prefix) {
    keymode = 1;
    doc.kb.classList.add('prefix');
    return false;
  }
}
let typeChar = (t, c, ev) => {
  clearHighlight();
  let v = t.value;
  let i = t.selectionStart;
  t.value = v.slice(0,i)+c+v.slice(t.selectionEnd);
  t.selectionStart = t.selectionEnd = i+c.length;
  return false;
}

let syncls={ v:"Value", f:"Function", m:"Modifier", d:"Modifier2", n:"Number", g:"Gets", p:"Paren", b:"Bracket", k:"Brace", h:"Head", l:"Ligature", n:"Nothing", s:"Separator", c:"Comment", a:"String" };
let keydesc='f+Conjugate;Add_f-Negate;Subtract_f×Sign;Multiply_f÷Reciprocal;Divide_f⋆Exponential;Power_f√Square Root;Root_f⌊Floor;Minimum_f⌈Ceiling;Maximum_f∧Sort Up;And_f∨Sort Down;Or_f¬Not;Span_f|Absolute Value;Modulus_f≤Less Than or Equal to_f<Enclose;Less Than_f>Merge;Greater Than_f≥Greater Than or Equal to_f=Rank;Equals_f≠Length;Not Equals_f≡Depth;Match_f≢Shape;Not Match_f⊣Identity;Left_f⊢Identity;Right_f⥊Deshape;Reshape_f∾Join;Join to_f≍Solo;Couple_f⋈Enlist;Pair_f↑Prefixes;Take_f↓Suffixes;Drop_f↕Range;Windows_f«Shift Before_f»Shift After_f⌽Reverse;Rotate_f⍉Transpose;Reorder axes_f/Indices;Replicate_f⍋Grade Up;Bins Up_f⍒Grade Down;Bins Down_f⊏First Cell;Select_f⊑First;Pick_f⊐Classify;Index of_f⊒Occurrence Count;Progressive Index of_f∊Mark First;Member of_f⍷Deduplicate;Find_f⊔Group Indices;Group_f!Assert;Assert with message_m˙Constant_m˜Self/Swap_d∘Atop_d○Over_d⊸Before/Bind_d⟜After/Bind_d⌾Under_d⊘Valences_d◶Choose_d⎊Catch_d⎉Rank_m˘Cells_d⚇Depth_m¨Each_m⌜Table_d⍟Repeat_m⁼Undo_m´Fold_m˝Insert_m`Scan_g←Define_g⇐Export_g↩Change_s⋄Separator_s,Separator_v.Namespace field_p(Begin expression_p)End expression_k{Begin block_k}End block_h;Next body_h:Header_h?Predicate_b⟨Begin list_b⟩End list_b[Begin array_b]End array_l‿Strand_n·Nothing_v•System_v𝕨Left argument_f𝕎Left argument (as function)_v𝕩Right argument_f𝕏Right argument (as function)_v𝕗Modifier left operand (as subject)_f𝔽Modifier left operand_v𝕘2-modifier right operand (as subject)_f𝔾2-modifier right operand_v𝕤Current function (as subject)_f𝕊Current function_m𝕣Current modifier_n¯Minus_nπPi_n∞Infinity_a@Null character_a\'Character_a\"String_c#Comment'.split(/[\n_]/);
let kk=Array.from('`123456890-=~!@#$%^&*()_+qwertuiop[]QWERTIOP{}asdfghjkl;ASFGHKL:"zxcvbm,./ZXVBM<>? \'');
let kv=Array.from('˜˘¨⁼⌜´˝∞¯•÷׬⎉⚇⍟◶⊘⎊⍎⍕⟨⟩√⋆⌽𝕨∊↑∧⊔⊏⊐π←→↙𝕎⍷𝕣⍋⊑⊒⍳⊣⊢⍉𝕤↕𝕗𝕘⊸∘○⟜⋄↖𝕊𝔽𝔾«⌾»·˙⥊𝕩↓∨⌊≡∾≍≠⋈𝕏⍒⌈≢≤≥⇐‿↩');
let keys={}, revkeys={}, primhelp={}, helpurl={};
kk.map((k,i)=>{keys[k]=kv[i];revkeys[kv[i]]=k;});
doc.kb.innerHTML = keydesc
  .map(d=>'<a class="key '+syncls[d[0]]+'">'+Array.from(d)[1]+'</a>')
  .concat(['<a href="keymap.html" target="_blank" title="Link to a BQN keyboard diagram">map</a>'])
  .join("&#8203;"); // zero-width space
let setPrefix = () => {
  doc.kb.querySelectorAll("a.key").forEach((x,i) => {
    let d = keydesc[i];
    let c = Array.from(d)[1];
    let t = d.slice(1+c.length).replace(';','\n');
    let h = t.toLowerCase().replace(/ (\(.*)?/g,'')
                           .replace(/[\n/]/g,'_');
    let k = revkeys[c]; if (k) t += '\n'+prefix+(k==='"'?'&quot;':k);
    x.title = primhelp[c] = t;
    x.href = helpurl[c] = 'help/'+h+'.html';
    x.onmousedown = ev => false; // don't take focus
    x.onclick = ev => ev.button || modified(ev) ? true
                    : typeChar(doc.code, c, ev);
  });
}
setPrefix();

let appendHTML = (e,a) => e.insertAdjacentHTML('beforeend', a);
appendHTML(doc.kb, '<div class="kbext"></div>');
doc.kbext = doc.kb.querySelector('.kbext');

if (doc.demo) {
  let fonts=[["BQN386"],["DejaVu","Mod"],["Fairfax","HD"],["3270","font"],["Iosevka","Term"],["Julia","Mono"]];
  let fclass = f => f==="3270"?"f"+f:f
  let fontsel = '<select title="Select font">'+fonts.map(f =>
      '<option value="'+f[0]+'">'+f[0]+(f[1]?' '+f[1]:'')+'</option>'
    ).join("")+'select';
  appendHTML(doc.kbext, fontsel);
  doc.kbext.querySelector('select').onchange =
    e=>doc.cont.className='cont '+fclass(e.target.value);
}

appendHTML(doc.kbext, '<input class="prfx" type="text" maxlength="1" title="Configure prefix key" value="'+prefix+'"/>');
doc.kbext.querySelector(".prfx").onchange = ev => {
  prefix = ev.target.value; setPrefix();
}

if (doc.perm) doc.perm.onmouseover = doc.perm.onfocus = () => {
  let b=(new TextEncoder()).encode(doc.code.value);
  doc.perm.href='#code='+btoa(String.fromCharCode(...b));
}

let demo = 0;
if (doc.demo) doc.demo.onclick = () => {
  const demos = [
    '<⟜\'a\'⊸/ "Big Questions Notation"'
   ,'≠⌜˜ 8 ⥊ 0‿1'
   ,'+´ 1 + ↕100'
   ,'(+´ ÷ ≠) 2‿5‿7‿4'
   ,'+`-˝ "()" =⌜ "(2×(4-1)÷(√9))"'
   ,'(⊑ + ↕∘¬˜´) "CG"'
   ,'0‿1‿10‿100⊸⍋⊸⊔ ⟨6,11,9,20,105,1,¯1,4⟩'
   ,'{(+`𝕩<\'a\') ⊔ 𝕩} "camelCaseWord"'
   ,'3‿4‿2⌾(0‿0⊸⍉) 3‿3⥊¯1'
   ,'∾ (<˘ ≍¨¨ 1↓↓) "abcd"'
   ,'Life←{∨´1‿𝕩∧3‿4=+˝⥊⌽⟜𝕩¨1-˜↕3‿3}\nLife⍟(↕4) 6‿6↑(1⊸=∨5⊸≤)3‿3⥊↕9'
   ,'⥊ 1‿0‿1 ∧⌜⍟3 1'
   ,'⌈˝ (≠ ↕ 0‿0⊸∾) 1‿2‿5‿4‿0‿2‿1'
  ];
  ++demo; if (demo===demos.length) demo=0;
  doc.code.value = demos[demo]; repl();
}

if (location.hash) {
  let code, run=1, ee=0;
  location.hash.slice(1).split('&').map(s => {
    if (s.slice(0,5)==='code=') code=s.slice(5);
    if (s.slice(0,5)==='norun') run=0;
    if (s.slice(0,7)==='explain') ee=1;
  });
  if (code!==undefined) {
    let b=new Uint8Array([...atob(code)].map(c=>c.charCodeAt(0)));
    let c=doc.code.value=(new TextDecoder()).decode(b);
    setcount(c); doc.code.rows = Math.max(doc.code.rows, 1+c.split("\n").length);
    if (ee && doc.doexplain) doc.doexplain.onclick();
    nojs = () => { throw Error("Possible script injection; press Run to confirm"); }
    if (run) { sysvals.js=nojs; repl(); }
    doc.code.focus();
  }
}