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algo-visualize.js
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// Copyright (c) 2020 Professor Peanut
// MIT license see accompanying file 'includedb.h' for details
// import visualization libraries {
const { Tracer, Array1DTracer, Array2DTracer, LogTracer, Layout,
HorizontalLayout, VerticalLayout } = require('algorithm-visualizer');
// }
var nodevec = [ {
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
},
{
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
},
{
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
},
{
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
},
{
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
},
{
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
},
{
"id" : 0,
"fileidx" : 0,
"next" : [0,0,0,0],
"visits" : 0
} ];
var ni = [ 0, 0, 0, 0, 0, 0, 0];
var nf = [ 0, 0, 0, 0, 0, 0, 0];
var nn = [ [0,0,0,0,0,0,0],
[0,0,0,0,0,0,0],
[0,0,0,0,0,0,0],
[0,0,0,0,0,0,0] ];
var vv = [ 0, 0, 0, 0, 0, 0, 0];
const N = ni.length;
// define tracer variables {
const tracerids = new Array1DTracer('ids');
const tracerfile = new Array1DTracer('filepos');
const tracernext = new Array2DTracer('next');
const tracervis = new Array1DTracer('visits');
const logger = new LogTracer('Console');
Layout.setRoot(new VerticalLayout([new HorizontalLayout([tracerids,
tracerfile,
tracervis]),
tracernext,
logger]));
tracerids.set(ni);
tracerfile.set(nf);
tracernext.set(nn);
tracervis.set(vv);
Tracer.delay();
// }
var heads = [0,0,0,0];
var visits = 0;
var nKeys = 0;//[0,0,0,0];
function getNewNodePos() {
return nKeys++;
}
function insertNewSkipnode(key, filepos) {
const newNodeAddr = getNewNodePos();
// visualize {
logger.println(`new node addr: ${newNodeAddr}`);
logger.println(`nKeys: ${nKeys}`);
tracerids.select(newNodeAddr);
tracerfile.select(newNodeAddr);
Tracer.delay();
// }
nodevec[newNodeAddr].id = key;
nodevec[newNodeAddr].fileidx = filepos;
// visualize {
tracerids.patch(newNodeAddr, nodevec[newNodeAddr].id);
tracerfile.patch(newNodeAddr, nodevec[newNodeAddr].fileidx);
Tracer.delay();
tracerids.depatch(newNodeAddr);
tracerfile.depatch(newNodeAddr);
// }
insertSkipnode(key, newNodeAddr, 3);
}
function insertSkipnode(key, pos, layer) {
// visualize {
tracernext.select(layer, pos);
// }
if (key < nodevec[heads[layer]].id) {
nodevec[pos].next[0] = pos;
nodevec[pos].next[1] = pos;
nodevec[pos].next[2] = pos;
nodevec[pos].next[layer] = heads[layer];
// visualize {
tracernext.patch(0, pos, nodevec[pos].next[0]);
tracernext.patch(1, pos, nodevec[pos].next[1]);
tracernext.patch(2, pos, nodevec[pos].next[2]);
tracernext.patch(layer, pos, nodevec[pos].next[layer]);
Tracer.delay();
tracernext.depatch(0, pos);
tracernext.depatch(1, pos);
tracernext.depatch(2, pos);
tracernext.depatch(layer, pos);
// }
heads[0] = pos;
heads[1] = pos;
heads[2] = pos;
heads[layer] = pos;
return;
}
var current = heads[layer];
var next = 0;
for (var i=0; i<nKeys-2; i++) {
next = nodevec[current].next[layer];
// visualize {
logger.println(` current: ${current}`);
logger.println(` next: ${next}`);
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
tracerids.select(current);
tracerfile.select(current);
tracernext.select(layer, current);
Tracer.delay();
// }
if (nodevec[next].id > key) {
// visualize {
logger.println(`--- break ----`);
Tracer.delay();
// }
nodevec[pos].next[0] = pos;
nodevec[pos].next[1] = pos;
nodevec[pos].next[2] = pos;
nodevec[pos].next[layer] = next;
// visualize {
tracernext.patch(0, pos, nodevec[pos].next[0]);
tracernext.patch(1, pos, nodevec[pos].next[1]);
tracernext.patch(2, pos, nodevec[pos].next[2]);
tracernext.patch(layer, pos, next);
Tracer.delay();
tracernext.depatch(0, pos);
tracernext.depatch(1, pos);
tracernext.depatch(2, pos);
tracernext.depatch(layer, pos);
// }
break;
}
else if (current === next) {
// visualize {
logger.println(`STOP`);
Tracer.delay();
// }
i = nKeys; // break
}
current = next;
}
// visualize {
logger.println(` current: ${current}`);
Tracer.delay();
// }
nodevec[current].next[layer] = pos;
// visualize {
tracernext.patch(layer, current, pos);
Tracer.delay();
tracernext.depatch(layer, current);
// }
}
function findSkipnode(key) {
const res = findPrevSkipnode(key, heads[0], 0);
// visualize {
logger.println(`res: ${res} key: ${key}`);
Tracer.delay();
// }
return nodevec[res].id === key ? res : "not found";
}
function findPrevSkipnode(key, start, layer) {
var current = start;
var prev = current;
for (var i=0; i<nKeys; i++) {
// visualize {
tracerids.select(current);
tracerfile.select(current);
tracernext.select(layer, current);
Tracer.delay();
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
if (layer <3 && (prev===current || nodevec[current].id > key)) {
// overshoot or empty
// visualize {
tracervis.select(current);
logger.println(`layer: ${layer} nodevec[cur].id ${nodevec[current].id} prev ${prev} cur ${current}`);
Tracer.delay();
tracervis.deselect(0, N-1);
// }
return findPrevSkipnode(key, nodevec[current].next[layer+1], layer+1);
} else if (nodevec[current].id === key) {
nodevec[current].visits += 1;
visits += 1;
if (((nodevec[current].visits*100) / visits) > 20) {
// promote:
// visualize {
logger.println(`promote new layer: ${layer-1} cur: ${current}`);
Tracer.delay();
// }
insertSkipnode(key, current, layer-1);
}
// visualize {
tracervis.patch(current, nodevec[current].visits);
Tracer.delay();
tracervis.depatch(current);
// }
return current;
} else if (nodevec[current].id >= key) {
// visualize {
logger.println(`stopping early. cur hay: ${current} needle ${key}`);
Tracer.delay();
// }
break;
}
prev = current;
current = nodevec[current].next[layer];
}
return prev;
}
function start() {
insertNewSkipnode(500, 0);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
insertNewSkipnode(111, 1);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
insertNewSkipnode(444, 2);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
insertNewSkipnode(222, 3);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
insertNewSkipnode(333, 4);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
insertNewSkipnode(44, 5);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
insertNewSkipnode(555, 6);
// visualize {
tracerids.deselect(0, N-1);
tracerfile.deselect(0, N-1);
tracernext.deselect(0, 0, 3, 6);
// }
// visualize {
logger.println(` --- Searching ---`);
// }
const resA = findSkipnode(123);
// visualize {
logger.println(`resA (should be 'not found'): ${resA}`);
Tracer.delay();
// }
const resB = findSkipnode(222);
// visualize {
logger.println(`resB (should be 3): ${resB}`);
Tracer.delay();
// }
const resC = findSkipnode(333);
// visualize {
logger.println(`resC(should be 4): ${resC}`);
Tracer.delay();
// }
}
start();