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🚧 wip: idea for text viewer

main
_ 2022-09-30 02:04:16 +00:00
parent 4307a199bc
commit 90a8efea71
2 changed files with 156 additions and 0 deletions
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30
scope/index.html Normal file
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<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link href="data:image/x-icon;base64,AAABAAEAEBAQAAEABAAoAQAAFgAAACgAAAAQAAAAIAAAAAEABAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAlJSUAAGIAAP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAAAAIiIiIgAAAAAAAAAgAAAAAAAAAAAAADIiIiIi
IiIjMhERERERESMyERERERERIzIREREREREjMhERIRERESMyERIiIiERIzIRESEREREjMhERERER
ESMyERERERERIzIREREREREjMiIiIiIiIiMAAAAAAAAAAAAAAAAAAAAAAAAAAIABAACAAQAAgAEA
AIABAACAAQAAgAEAAIABAACAAQAAgAEAAIABAACAAQAA" rel="icon" type="image/x-icon" />
<style>
body {
font-family: sans-serif;
}
#JNG5U2EX {
border: solid black 1px;
}
</style>
<title>Scope</title>
</head>
<body>
<pre id="JNG5U2EX"></pre>
<button onclick="cursor_left ()">Left</button>
<button onclick="cursor_right ()">Right</button>
<button onclick="cursor_up ()">Up</button>
<button onclick="cursor_down ()">Down</button>
<pre id="XDHSIT76"></pre>
<script src="scope.js"></script>
</body>
</html>

126
scope/scope.js Normal file
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const sync_max = 512;
const textarea = document.getElementById ("JNG5U2EX");
const debug_text = document.getElementById ("XDHSIT76");
textarea.innerText = "Loading...";
let page = "";
let offset = 0;
function line_start_before (page, offset) {
const sync_start = Math.max (sync_max, offset) - sync_max;
for (let i = offset; i >= sync_start; i--) {
const c = page.charAt (i);
if (c == '\n') {
return i + 1;
}
}
return null;
}
function line_start_after (page, offset)
{
for (let i = offset; i < offset + sync_max; i++) {
const c = page.charAt (i);
if (c == '\n') {
return i + 1;
}
}
return null;
}
function layout_text (page, offset) {
const width = 120;
const height = 24;
const line_start = line_start_before (page, offset) || 0;
// Compute layout
let lines = Array ();
let line = "";
for (let i = line_start; i < page.length; i++) {
if (lines.length >= height) {
break;
}
if (line.length >= width) {
lines.push (line);
line = "";
}
const c = page.charAt (i);
if (c == '\n') {
lines.push (line);
line = "";
}
else {
line = line + page.charAt (i);
}
}
return lines.join ('\n');
}
function repaint (offset)
{
textarea.innerText = layout_text (page, offset);
debug_text.innerText = "Offset: " + offset + "\n";
}
async function async_main ()
{
let file_length = null;
{
const resp = await fetch ("log.txt", {
"method": "HEAD",
});
file_length = resp.headers.get ("content-length");
}
const resp = await fetch ("log.txt", {
"headers": {
"range": "bytes=0-65535",
},
});
page = await resp.text ();
repaint (offset);
}
async_main ().then (
function (val) {},
function (err) {}
);
function cursor_left ()
{
offset = Math.max (1, offset) - 1;
repaint (offset);
}
function cursor_right ()
{
offset += 1;
repaint (offset);
}
function cursor_up ()
{
offset = line_start_before (page, offset - 2) || 0;
repaint (offset);
}
function cursor_down ()
{
offset = line_start_after (page, offset);
repaint (offset);
}