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visual_demo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="paperjs-v0.11.4/dist/paper-full.js"></script>
<script
src="https://code.jquery.com/jquery-3.2.1.min.js"
integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
crossorigin="anonymous"></script>
<!-- default paperscript paser doesn't support ECMA2015-->
<!-- so you need to import newer version of acorn.js -->
<script src='https://cdnjs.cloudflare.com/ajax/libs/acorn/4.0.11/acorn.js'></script>
<script type="text/paperscript" canvas="myCanvas">
var nextCenter = view.center;
var nextZoom = view.zoom;
var prevNodeOutline = null;
var prevExecutedNode = null;
var vertical = 40;
var texts = {
TRUE: [["true"]],
FALSE: [["false"]],
UNIT: [["unit"]],
NUM: [["num", 'n']],
VAR: [["var", "v"]],
ADD: [["e", "nt"], ["+"], ["e", "nt"]],
SUB: [["e", "nt"], ["-"], ["e", "nt"]],
MUL: [["e", "nt"], ["*"], ["e", "nt"]],
DIV: [["e", "nt"], ["/"], ["e", "nt"]],
EQUAL: [["e", "nt"], ["="], ["e", "nt"]],
LESS: [["e", "nt"], ["<"], ["e", "nt"]],
NOT: [["not"], ["e", "nt"]],
SEQ: [["e", "nt"], [";"], ["e", "nt"]],
IF: [["if"], ["e", "nt"], ["then"],
["e", "nt"], ["else"], ["e", "nt"]
],
WHILE: [["while"], ["e", "nt"], ["do"], ["e", "nt"]],
LETV: [["Let"], ["x", "v"],
[":="], ["e", "nt"], ["in"], ["e", "nt"]],
LETF: [["Let"], ["proc"], ["f", "v"], ["("], ["args", "nt"], [")"],
["="], ["e", "nt"], ["in"], ["e", "nt"]],
CALLV: [["f", "v"], ["("], ["args", "nt"], [")"]],
CALLR: [["f", "v"], ["<"], ["args", "nt"], [">"]],
FIELD: [["e", "nt"], ["."], ["x", "v"]],
ASSIGN: [["x", "v"], [":="], ["e", "nt"]],
ASSIGNF: [["e", "nt"], ["."], ["x", "v"], [":="], ["e", "nt"]],
READ: [["READ"], ["x", "v"]],
WRITE: [["WRITE"], ["e", "nt"]],
}
var Content = Base.extend({
initialize: function(start_pt, type, vtexts){
this.type = type;
this.all = [];
this.nts = []; // non terminal contents
this.vs = []; // variables
this.nums = [];
if (type === "ARGS" || type === "RECORD" )
var t = vtexts;
else{
var t = texts[type]; }
this.fillContents(start_pt,t);
this.updateBounds();
},
fillContents: function(start_pt, ts){
var prev = null;
for (var i = 0; i < ts.length; i++){
var cur = new PointText();
cur.fontSize = 15;
cur.content = ts[i][0];
cur.fontWeight = 'bold';
if (ts[i][1] === 'nt'){
cur.fillColor = 'red';
this.nts.push(cur);}
if (ts[i][1] === 'v'){
cur.fillColor = '#772277';
this.vs.push(cur);}
if (ts[i][1] === 'n'){
cur.fillColor = '#122277';
this.nums.push(cur);}
this.all.push(cur); }
this.update();
},
// move first text's topLeft
moveTo: function(pt){
var prev = null;
for (var i = 0; i < this.all.length; i++){
var cur = this.all[i];
if (i == 0){
cur.bounds.topLeft = pt;}
else {
cur.position = prev.position +
{x:5+ (cur.bounds.width/2)+(prev.bounds.width/2),
y:0};}
prev = cur;}
this.updateBounds();
},
updateBounds: function(){
var fb = this.all[0].bounds;
var lb = this.all[this.all.length-1].bounds;
this.bounds = {};
this.bounds.x = fb.x;
this.bounds.y = fb.y;
this.bounds.width = lb.x - fb.x + lb.width;
this.bounds.height = lb.y - fb.y + lb.height;
},
updatePositions: function(){
var prev = null;
for (var i = 0; i < this.all.length; i++){
var cur = this.all[i];
if (i != 0){
cur.position = prev.position +
{x:5+ (cur.bounds.width/2)+(prev.bounds.width/2),
y:0};}
prev = cur; }
},
update: function(){
this.updatePositions();
this.updateBounds();
},
clear: function(){
var all = this.all;
for (var i = 0; i < all.length; i++){
all[i].remove(); }
},
// hide: function(){
// var all = this.all;
// for (var i = 0; i < all.length; i++){
// all[i].setVisible(false); }
// }
});
var Node = Base.extend({
initialize: function(start_pt, type, vtexts) {
this.content = new Content(start_pt, type, vtexts);
this.type = type;
this.children = [];
this.edges = [];
this.update();
},
moveTo: function(pt){
this.content.moveTo(pt);
this.update();
},
adopt: function(children){
if (this.content.nts.length !== children.length){
alert("Error: Wrong number of children added");
alert("childre lengths:" + this.children.length);
alert("nts lengths:" + this.content.nts.length);}
for (var i = 0 ; i < children.length; i++){
this.children.push(children[i]);
children[i].parent = this;
var e = new Path.Line([0,0], [0,0]);
e.strokeColor = 'black';
this.edges.push(e);}
this.updateEdges();
},
setVariable: function(idx, vname){
this.content.vs[idx].content = vname;
this.update();
},
setNumber: function(value){
if (this.content.type != "NUM"){
alert("Error. set number to a non-number type") }
this.content.all[0].content = String(value);
this.update();
},
update: function(){
this.content.update();
this.updateOutline();
this.updateEdges();
this.bounds = this.content.bounds;
},
updateOutline: function(){
var bounds = this.content.bounds;
if (this.outline){
this.outline.bounds = {x:bounds.x-3, y:bounds.y-3,
width: bounds.width + 6, height: bounds.height+ 6};}
else{
this.outline = new Path.Rectangle(
[bounds.x-3, bounds.y-3], [bounds.width+6, bounds.height+6]);
this.outline.strokeColor = '#999999';
this.outline.fillColor='#FDFDFD'
this.outline.blendMode = 'multiply';}
this.outline.smooth({type: 'geometric', factor: 0.1 });
this.outline.onClick = moveCenterToThis
},
updateEdges: function(){
for (var i = 0; i < this.children.length; i++){
var pb = this.content.nts[i].bounds
var pbottom = new Point(
{x: pb.x + (pb.width/2), y: pb.y + pb.height});
var cb = this.children[i].outline.bounds;
var ctop = new Point(
{x: cb.x + (cb.width/2), y: cb.y});
var edge = this.edges[i];
edge.segments = []
// edge.removeSegment(1);
// edge.removeSegment(0);
edge.add(pbottom);
edge.add(ctop); }
},
// move first text's topLeft
moveTo: function(pt){
this.content.moveTo(pt);
this.update();
},
clear: function(){
this.content.clear();
this.outline.remove();
var edges = this.edges;
for (var i = 0; i < edges.length; i++){
edges[i].remove(); }
}
});
var terminals = ["NUM", "TRUE", "FALSE", "UNIT", "VAR", "READ", "RECORD"];
function isTerminal(type){
var ret = false
for (var i = 0; i < terminals.length; i++)
if(terminals[i] === type)
ret = true;
return ret;
}
function variableText(type, cont){
var vtexts = [];
if (type === "ARGS"){
if (cont.length >= 1){
// In case of ARGS of LETF or CALLR
// contents are not expressions
if (typeof cont[0] === "string"){
vtexts.push(["x", "v"]);
for (var i = 1; i < cont.length; i++){
vtexts.push([","]);
vtexts.push(["x", "v"]); }
}
// In case of ARGS of CALLV
// contents will be evaluated later on
else{
vtexts.push(["e", "nt"]);
for (var i = 1; i < cont.length; i++){
vtexts.push([","]);
vtexts.push(["e", "nt"]); }
} }
}
else if (type === "RECORD"){
vtexts.push(["{"]);
for (var i = 0; i < cont.length; i++){
// ex) a := 1
vtexts.push([ cont[i][0], "v" ]);
vtexts.push([":="]);
vtexts.push([ String(cont[i][1]["NUM"]),
'n'] ); }
vtexts.push(["}"]); }
return vtexts;
}
function _drawTree(ast, left, level){
var type = Object.keys(ast)[0];
var cont = ast[type]; // array
var vtexts = variableText(type, cont);
var cur = new Node([0,0], type, vtexts);
console.log(type + " start")
for (var i = 0; i < terminals.length; i++){
if (terminals[i] === type){
if (type == "NUM")
cur.setNumber(cont[0]);
if (type == "VAR" || type == "READ"){
for (var j = 0; j < cont.length; j++){
cur.setVariable(j, cont[j]);}
}
var w = cur.bounds.width;
cur.moveTo([left,level*vertical])
return [w+16, cur];
}
}
var varCount = 0;
var totalWidth = 0;
var widths = [];
var children = [];
for (var i = 0; i < cont.length; i++){
// console.log("children", typeof cont[i]);
if (typeof cont[i] === "string"){
// if (type !== "CALLV")
// continue;
cur.setVariable(varCount, cont[i]);
// console.log("set ",cur,"to",cont[i]);
varCount++;
continue;
}
var result = _drawTree(
cont[i], left + totalWidth, level+1);
totalWidth += result[0]; // result[0]: width
widths.push(result[0]);
children.push(result[1]); // result[1]: new_node
}
cur.adopt(children)
var left_added = 0;
if ((widths.length % 2) == 0){
for (var i = 0; i < (widths.length/2); i++){
left_added += widths[i];}
}
else if(widths.length != 1) {
var i = 0;
for (; i < Math.floor((widths.length/2)); i++){
left_added += widths[i];}
}
console.log(type, " end")
cur.moveTo([left + left_added, level*vertical]);
var w = Math.max(totalWidth, cur.bounds.width);
return [w+16, cur];
}
function drawTree(ast){
if(curTree)
removeTree(curTree);
var result = _drawTree(ast, 0, 0);
window.curTree = result[1];
curTree.parent = null;
return result;
}
function removeTree(node){
var children = node.children;
node.clear();
delete node;
for (var i = 0; i < children.length; i++)
removeTree(children[i]);
}
function onFrame(event){
var delta = nextCenter - view.center;
_x = Math.round(delta.x/7);
_y = Math.round(delta.y/7);
view.center = view.center + {x:_x, y:_y};
var delta = (nextZoom - view.zoom)/6;
if (delta > 0.002 || delta < -0.002)
view.zoom = view.zoom + delta;
}
function moveCenterToThis(event){
nextCenter = event.point;
this.fillColor = '#CCCCFD';
if (prevNodeOutline)
prevNodeOutline.fillColor = '#FDFDFD';
prevNodeOutline = this;
}
function moveCenterTo1(nodeOutline){
if (nextCenter - nodeOutline.position == {x:0, y:0}){
return;}
nextCenter = nodeOutline.position;
nodeOutline.fillColor = '#CCCCFD';
if (prevNodeOutline)
prevNodeOutline.fillColor = '#FDFDFD';
prevNodeOutline = nodeOutline;
}
function focus(node, curVal, mem, env){
if (curVal === null) curVal = "unit";
moveCenterTo1(node.outline);
$("#result h4#result-content").text(curVal);
renewMem(mem);
renewEnv(env); }
function renewMem(mem){
var table = $("#memory table");
table.empty();
var keys = Object.keys(mem);
for (var i = 0; i < keys.length;){
var tr_addr = $("<tr/>").addClass("addr");
var tr_content = $("<tr/>");
for(var count5 = 0; count5 < 5 && i < keys.length;
count5++, i++){
tr_addr.append(
$("<td/>").text(keys[i]) );
tr_content.append($("<td/>").text(
mem[keys[i]]) ); }
table.append(tr_addr).append(tr_content); }
}
function renewEnv(env){
var table = $("#env table");
table.empty();
var keys = Object.keys(env);
for (var i = 0; i < keys.length;){
var tr = $("<tr/>");
for(var count2 = 0; count2 < 2 && i < keys.length;
count2++, i++){
var key = ("<span style='color: #772277'>" +
keys[i] + "</span>");
var content = (" : <span style='font-size:0.5em'>" +
env[keys[i]] + "</span>");
if (typeof env[keys[i]] === 'object'){
content = " : proc" }
tr.append(
$("<td>").append(key).append(content) );
}
table.append(tr); }
}
function printInit(){
$("#print table").empty(); }
function printUpdate(val){
$("#print table").append(
"<tr><td>" + val + "</td></tr>"); }
function decorateInit(){
$("#result h3").text("Interpretation of").append("<br>").append(
"the current node").css("color", "black");
$("#result h4#result-content").css("color", "black").empty(); }
function decorateFinal(){
$("#result h3").text("Final interpretation").append("<br>").append(
"of the program").css("color", "blue");
$("#result h4#result-content").css("color", "blue"); }
function* travMaker(node){
moveCenterTo1(node.outline);
yield node.type;
var cLen = node.children.length;
for (var i = 0; i < cLen; i++){
var travGenerator = travMaker(node.children[i]);
var next = travGenerator.next();
while (!next.done){
yield next.value
next = travGenerator.next();}
}
if(cLen){
moveCenterTo1(node.outline);
yield node.type;}
}
window.curTree = null;
window.drawTree = drawTree;
window.removeTree= removeTree;
window.focus = focus;
window.printInit = printInit;
window.printUpdate = printUpdate;
window.decorateInit = decorateInit;
window.decorateFinal = decorateFinal;
window.moveCenterTo2 = function(coord){nextCenter=new Point(coord)};
zooms = {0.25:{1:0.5, "-1":0.25},0.5: {1:1, "-1":0.25},
1:{1:2, "-1":0.5}, 2:{1:3, "-1":1},
3:{1:4, "-1":2}, 4:{1:4, "-1":3}}
window.zoom = function(z){
nextZoom = zooms[nextZoom][z];
};
window.travMaker = travMaker;
// modifications for demonstration
// test case 3
j = {"LETV":["x",{"NUM":[0]},{"LETV":["y",{"NUM":[1]},{"LETV":["z",{"NUM":[1]},{"LETV":["k",{"NUM":[0]},{"LETV":["c",{"NUM":[0]},{"SEQ":[{"READ":["k"]},{"WHILE":[{"EQUAL":[{"VAR":["c"]},{"NUM":[0]}]},{"IF":[{"LESS":[{"VAR":["z"]},{"VAR":["k"]}]},{"SEQ":[{"SEQ":[{"SEQ":[{"WRITE":[{"VAR":["z"]}]},{"ASSIGN":["x",{"VAR":["y"]}]}]},{"ASSIGN":["y",{"VAR":["z"]}]}]},{"ASSIGN":["z",{"ADD":[{"VAR":["x"]},{"VAR":["y"]}]}]}]},{"ASSIGN":["c",{"NUM":[1]}]}]}]}]}]}]}]}]}]}
var width_and_tree = drawTree(j);
var width = width_and_tree[0];
printInit();
decorateInit();
moveCenterTo2([width/2, paper.view.size.height/2 + 100]);
$("code").hide();
window.executeAll = function(){
$("#execute").hide();
var width_and_tree = drawTree(j);
var width = width_and_tree[0];
printInit();
decorateInit();
moveCenterTo2([width/2, paper.view.size.height/2 + 100]);
var gen = eval(curTree);
var done = false;
function one(){
if(!gen.next().done){
setTimeout(one, 400); } }
setTimeout(one, 400);
}
var show = true;
window.showCode = function showCode(){
if (show){
$("canvas").hide();
$("code").show();
show = false; }
else {
$("code").hide();
$("canvas").show();
show = true; }
}
</script>
<script src="eval_generator.js"></script>
<script>
</script>
</head>
<style>
html,
.ast{
height: 80%;
}
canvas[resize] {
width: 75%;
height: 100%;
margin-left: -8%; }
#control {
position:fixed;
top: 30px;
left: 30px;
width: 120px;
text-align: left; }
#control div {
margin: 10px; }
/* table.result {
margin: auto; }*/
#memory{
text-align: center;
position:fixed;
top: 280px;
left: 10px; }
#memory-scroll{
width: 250px;
height:150px;
overflow:auto;
margin-top:20px; }
#memory table {
width:100%;
border-collapse: collapse;
table-layout: fixed;}
#memory table, #memory td {
border: 1px Beige solid; }
#memory td{
width:20%;
}
#memory tr.addr{
font-size: 0.5em; }
#env{
text-align: center;
position:fixed;
top: 450px;
left: 10px; }
#env-scroll{
width: 250px;
height:150px;
overflow:auto; }
#env table {
width:100%;
border-collapse: collapse;
table-layout: fixed;}
#env table, #env td {
border: 1px Beige solid; }
#env td{
width:50%;
}
#print{
position:fixed;
top: 10%;
right: 8%;
height: 40%; }
#print-content{
height:100%;
overflow:auto; }
#result {
position:fixed;
width: 250px;
bottom:10%;
right:3%; }
</style>
<body style="text-align: center;">
<div id="control">
<div><button type="button" onclick='zoom(1)'>Zoom in</button></div>
<div><button type="button" onclick='zoom(-1)'>Zoom out</button></div>
<div><button id="execute" type="button" onclick='executeAll()'>Execute all</button></div>
<div><button id="show-code" type="button" onclick='showCode()'>Show/Hide<br/>code</button></div>
</div>
<div id="memory">
<div id="memory-scroll">
<h3>Memory</h3>
<table>
</table>
</div>
</div>
<div id="env">
<div id="env-scroll">
<h3>Environment</h3>
<table>
</table>
</div>
</div>
<div id="print">
<h3 >Printed<br>(Side effects)</h3>
<div id="print-content">
<table>
</table>
</div>
</div>
<div id="result">
<h3> Interpretation of<br>the current node</h3>
<h4 id="result-content"></h4>
</div>
</div>
<div class="ast">
<h3> Abstract Syntax Tree for B language </h3>
<canvas id="myCanvas" resize="true"></canvas>
<div style="width:35%;margin:auto" >
<pre style="text-align:left;"><code>
(* fibonacci *)
let x := 0 in
let y := 1 in
let z := 1 in
let k := 0 in
let c := 0 in
read k;
while (c = 0) do (
if (z < k) then (
write z;
x := y;
y := z;
z := x + y
) else (
c := 1
)
)
</code></pre></div>
</div>
</body>
</html>