JSLisp/debug.html at master · 6502/JSLisp · GitHub

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<!DOCTYPE html>
<html>
  <body>
    <div style="position:absolute; left:0px; top:0px; right:0px; bottom:0px">
      <input type="button" value="Step" id="step" style="position:absolute; left:8px; top:8px; width:80px; height:30px"/>
      <input type="button" value="Continue" id="continue" style="position:absolute; left:96px; top:8px; width:80px; height:30px"/>
      <select id="stack" style="position:absolute; left:184px; top:8px; right:8px; height:30px"></select>
      <div id="src" style="position:absolute; left:8px; top:46px; right:8px; bottom:8px; border:solid 1px #000; white-space:pre; font-family:monospace; font-size:12px;">
      </div>
    </div>
    <script>

var parent = window.dialogArguments[0];
var stack = window.dialogArguments[1];
var st = document.getElementById("stack");
var sources = parent.debug_sources || (parent.debug_sources = {});
var current_source = null;
var src = document.getElementById("src");
var step = document.getElementById("step");
var cont = document.getElementById("continue");

var chspan = document.createElement("span");
chspan.textContent = "XXXXXXXXXX";
src.appendChild(chspan);
var chw = chspan.offsetWidth / 10;
src.removeChild(chspan);

for (var i=stack.length-1; i>=0; i--)
{
    var x = document.createElement("option");
    x.value = i;
    x.textContent = stack[i];
    st.appendChild(x);
}

function linecol(text, pos)
{
    var x = text.slice(0, pos).split("\n");
    return {line: x.length-1,
            col: x[x.length-1].length};
}

function source(name)
{
    if (!sources[name])
    {
        var req = new XMLHttpRequest();
        req.open("GET", name, false);
        req.send(null);
        var src = req.responseText;
        var lines = src.split("\n");
        var container = document.createElement("div");
        container.style.position = "absolute";
        container.style.left = "0px";
        container.style.right = "0px";
        container.style.top = "0px";
        container.style.bottom = "0px";
        container.style.overflow = "auto";
        for (var i=0; i<lines.length; i++)
        {
            var L = document.createElement("div");
            L.style.position = "relative";
            L.style.minHeight = "1em";
            L.textContent = lines[i];
            var sel = document.createElement("div");
            sel.style.position = "absolute";
            sel.style.left = "0px";
            sel.style.width = "0px";
            sel.style.top = "0px";
            sel.style.bottom = "0px";
            sel.style.backgroundColor = "rgba(0, 255, 0, 0.25)";
            L.appendChild(sel);
            container.appendChild(L);
            lines[i] = L;
        }
        sources[name] = {src: src, lines: lines, container: container};
    }
    return sources[name];
}

function select(location)
{
    var s = source(location[0]);
    var lines = s.lines;

    if (current_source != location[0])
    {
        while (src.firstChild)
            src.removeChild(src.firstChild);
        current_source = location[0];
        src.appendChild(s.container);
    }

    var LC0 = linecol(s.src, location[1]);
    var LC1 = linecol(s.src, location[2]);
    for (var i=0; i<lines.length; i++)
    {
        if (i < LC0.line || i > LC1.line)
        {
            lines[i].lastChild.style.width = "0px";
            lines[i].lastChild.style.right = null;
        }
        else if (i == LC0.line && i == LC1.line)
        {
            lines[i].lastChild.style.left = chw*LC0.col + "px";
            lines[i].lastChild.style.right = null;
            lines[i].lastChild.style.width = chw*(LC1.col - LC0.col) + "px";
        }
        else if (i == LC0.line)
        {
            lines[i].lastChild.style.left = chw*LC0.col + "px";
            lines[i].lastChild.style.width = null;
            lines[i].lastChild.style.right = "0px";
        }
        else if (i == LC1.line)
        {
            lines[i].lastChild.style.left = "0px";
            lines[i].lastChild.style.right = null;
            lines[i].lastChild.style.width = chw*LC1.col + "px";
        }
        else
        {
            lines[i].lastChild.style.left = "0px";
            lines[i].lastChild.style.width = null;
            lines[i].lastChild.style.right = "0px";
        }
    }

    s.container.scrollTop = Math.max(0, lines[LC0.line].offsetTop - s.container.offsetHeight/2);
}

select(stack[stack.length-1]);

function bye(x)
{
    window.returnValue = x;
    parent.debug_screenLeft = window.screenLeft;
    parent.debug_screenTop = window.screenTop;
    parent.debug_screenWidth = window.innerWidht;
    parent.debug_screenHeight = window.innerHeight;
    window.close();
}

step.onclick = function() { bye("step"); };
cont.onclick = function() { bye("cont"); };
st.onchange = function() { select(stack[st.options[st.selectedIndex].value]); }

    </script>
  </body>
</html>