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<!DOCTYPE html style="height: 100%; margin:0">
<meta charset="utf-8">
<title>Simple Viewer</title>
<script src="d3.v7.min.js"></script>
<script src="graphviz.umd.js"></script>
<script src="d3-graphviz.js"></script>
<body style="height: 100%; margin:0">
<div style="display:flex; flex-flow:column; height: 100%;">
<div style="position:fixed; top:0; left:0; height:20%; width:30%;" >
<div align="center" >Simple Program:</div>
<textarea
id="program"
autofocus="true"
name="Program"
defaultValue="return 0;"
></textarea>
</div>
<div id="fill" style="flex: 1 1 auto"> </div>
<div id="graph" style="flex: 0 1 auto; align-self:center;"> </div>
<div style="display:flex; flex-flow:row; flex: 0 1 auto; align-self:center;">
<style>
.button { color:white; background-color:black; font-size:20px; min-width:30px }
</style>
<button id="doPrev" type="button" onclick="doPrev()" class="button">⮜</button>
<div id="N" style="font-size: 20px; border-style: ridge; min-width: 50px; text-align: right; padding-right: 10px;">0</div>
<button id="doNext" type="button" onclick="doNext()" class="button">⮞</button>
<div id="len" style="font-size: 20px; min-width: 50px; text-align: right; padding-right: 10px;">0</div>
<button id="doExit" type="button" onclick="doExit()" class="button">Exit</button>
</div>
</div>
<script>
var _timer; // Shutdown timer if server goes silent
var N=0 ; // Which dot/graph is being displayed
var dots=[]; // An array of DOT strings
var done; // No more DOTs from server
// Graphviz renderer
var graphviz = d3.select("#graph").graphviz()
.transition(function () {
return d3.transition("main")
.ease(d3.easeLinear)
.delay(0)
.duration(500);
});
// Websocket. :-P
const socket = new WebSocket("ws://localhost:12345");
// Read user program
const DOC_PROG = document.getElementById('program');
// Default value seems to be ignored???
DOC_PROG.value="return 0;";
function get_program() {
console.log("get_program");
var src = DOC_PROG.value;
console.log(src);
// Reset visualizer state before sending
updateN(0);
dots=[];
done=false;
// Send program; will start getting DOT frames shortly
socket.send(src);
// Once the program is sent, timer starts
_timer = setTimeout("close()",100000)
};
DOC_PROG.onchange=get_program;
// Go forwards in the animation
function doNext() {
updateN(N+1);
if( N < dots.length ) {
render(N-1,N,1);
} else {
N = dots.length;
socket.send("+"); // Block awaiting server next frame
}
}
// Go back in the animation
function doPrev() {
if( N>0 ) {
updateN(N-1);
if( N < dots.length-1 ) {
render(N+1,N,-1);
}
}
}
// exit
function doExit() { socket.send(null); close(); };
// Update step counter display and buttons
function updateN(newN) {
N = newN;
DOC_PREV = document.getElementById("doPrev");
DOC_NEXT = document.getElementById("doNext");
if( N==0 && !DOC_PREV.disabled ) {
DOC_PREV.disabled = true;
DOC_PREV.style.backgroundColor = "grey";
}
if( N>0 && DOC_PREV.disabled ) {
DOC_PREV.disabled = false;
DOC_PREV.style.backgroundColor = "black";
}
if( N <dots.length && DOC_NEXT.disabled ) {
// Indicate stall, no next frame from server
DOC_NEXT.textContent = "\u2B9E";
DOC_NEXT.disabled = false;
DOC_NEXT.style.backgroundColor = "black";
}
if( N==dots.length && !DOC_NEXT.disabled ) {
// Indicate stall, no next frame from server
DOC_NEXT.textContent = "...";
DOC_NEXT.disabled = true;
DOC_NEXT.style.backgroundColor = "grey";
}
document.getElementById("N") .textContent = N==dots.length ? (">"+(N-1)) : N;
document.getElementById("len").textContent = dots.length;
};
// Render an animation, from idx to end by step.
// 'end' is inclusive.
var renderActive = -1;
function render(idx, end, step) {
old = renderActive;
renderActive = (end+step);
// No active, so start rendering
if( old == -1 )
_rend(idx,end+step,step);
}
// Render an animation in a 'for' loop of frames
// until we hit the end. Looping is done via callbacks.
// end is exclusive.
var aix = -1; // Last DOT rendered
function _rend(idx,end,step) {
// Skip animation if already rendered/showing on screen
if( idx==aix ) _rendNext(idx,end,step);
else {
aix = idx;
var str = dots[idx].indexOf("// POS: ");
console.log(str);
if( str == -1 ) DOC_PROG.setSelectionRange(0,0);
else {
var pos = Number(dots[idx].substring(str+8,str+12));
console.log(pos,pos+1);
document.getElementById("program").focus();
document.getElementById("program").setSelectionRange(pos,pos+1);
}
graphviz.renderDot(dots[idx]).on("end", () => _rendNext(idx,end,step))
}
}
function _rendNext(idx,end,step) {
// Not at end so...
if( idx+step != end )
// Render next step
_rend(idx+step,end,step);
else {
// All desired frames rendered
if( renderActive == end ) {
renderActive = -1; // all frames done
} else {
// Skip-a-few and render the last asked for
_rend(renderActive-1,renderActive,1)
}
}
};
socket.onopen = () => { console.log('WebSocket connection opened'); };
// receive message from server; either a shutdown or a new graph
socket.onmessage = (event) => {
clearTimeout(_timer); _timer=null;
const dot = event.data;
console.log("Received:", dot.substring(0,40));
if( dot == "!" ) {
// Server requests client resets
get_program();
} else if( dot == "#" ) {
// Server sent final frame
done = true;
} else if( dot.startsWith("digraph") ) {
// Received a new graph
dots.push(dot);
//console.log(dot);
updateN(N);
socket.send("+"); // Get another frame
// If at-end, receiving a graph immediately renders
if( dots.length==1 )
graphviz.renderDot(dots[0]);
else if( N+1 == dots.length )
render(N-1,N,1);
// After render, hang around until user clicks things
console.log("GRAPHVIZ done; N="+N+"; dots="+dots.length);
} else {
console.error('Server sent unexpected: ',dot);
get_program();
}
};
socket.onclose = () => { close(); }
socket.onerror = (error) => {
console.error('WebSocket error:', error);
};
</script>
</body>
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