Implement a basic initial working version

kusaba.js

@@ -0,0 +1,65 @@
+await (async () => {
+    delete Array.prototype.toJSON;
+
+    const processReply = (elem) => {
+        const id = +elem.querySelector(":scope > .postwidth > a[name]:not([name=s])").getAttribute("name");
+        const title = elem.querySelector(":scope > .postwidth .filetitle")?.innerText.trim();
+        const author = elem.querySelector(":scope > .postwidth .postername").innerText.trim();
+        const uid = elem.querySelector(":scope > .postwidth .uid").innerText.replace("ID: ", "");
+        const file = elem.querySelector(":scope > .postwidth > .filesize > a")?.href ?? undefined;
+        const postertrip = elem.querySelector(":scope > .postwidth .postertrip")?.innerText.trim();
+        const rawHtml = elem.querySelector(":scope > blockquote").innerHTML
+            .replace(`<div style="display:inline-block; width:400px;"></div><br>`,"")
+            .trim();
+        const date = [...elem.querySelector(":scope > .postwidth > label").childNodes]
+            .pop().data.trim()
+            .replace(
+                /(\d{4,4})\/(\d\d)\/(\d\d)\(\w+\)(\d\d):(\d\d)/,
+                "$1-$2-$3T$4:$5:00Z"
+            )
+            .replace(
+                /href=\\"\/kusaba\/questarch\/res\/\d+.html#\d+\\" onclick=\\"return highlight\('\d+', true\);\\"/,
+                ""
+            );
+
+        const filenameRaw = elem.querySelector(":scope > .postwidth > .filesize")?.innerText;
+        const filename = filenameRaw?.includes("File ") ?
+        	filenameRaw.match(/File \d+\.[^ ]+ - \([\d\.KMG]+B , \d+x\d+ , (.*) \)/)[1]
+        	?? undefined : undefined;
+        const ret = {
+            id,
+            author,
+            uid,
+            rawHtml,
+            date
+        }
+        if (file) ret.file = file;
+        if (file) ret.filename = filename;
+        if (postertrip) ret.tripcode = postertrip;
+        if (title) ret.title = title;
+        return ret;
+    }
+
+    const replies = [...document.getElementsByClassName("reply")];
+    replies.unshift(document.getElementById("delform"))
+
+    const processed = replies.map(elem => processReply(elem));
+
+    const blob = new Blob(
+        [JSON.stringify(processed, null, 4)],
+        {type : 'application/json'}
+   	)
+
+    const a = document.createElement("a");
+    const url = URL.createObjectURL(blob);
+    a.href = url;
+    a.download = `thread_${processed[0].id}.json`;
+    document.body.appendChild(a);
+    a.click();
+    URL.revokeObjectURL(url);
+    a.remove();
+
+
+    return ;
+
+})();