// ==UserScript==

// @name Register Table Ziggifier

// @namespace http://tampermonkey.net/

// @version 2025-07-28

// @description This userscript tries to catch register definition tables on the arm documentation and convert them into Zig code

// @author xq

// @match https://developer.arm.com/documentation/*

// @icon https://www.google.com/s2/favicons?sz=64&domain=arm.com

// @grant none

// ==/UserScript==

/**

*

* Try on:

* - https://developer.arm.com/documentation/100235/0100/The-Cortex-M33-Peripherals/System-Control-Block/MemManage-Fault-Address-Register?lang=en

* - https://developer.arm.com/documentation/dui0662/b/Cortex-M0--Peripherals/System-Control-Block/System-Control-Register?lang=en

*

*/

(function() {

'use strict';

console.log("startup...");

let pattern = /\[(\d+)(?::(\d+))?\]/;

function process()

{

for(const table of document.querySelectorAll("table.c-table"))

{

console.log(table);

let fields = [];

for(const row of table.rows)

{

if(row.cells.length != 3) {

continue;

}

let cells = Array.from(row.cells).map(x => x.innerText);

const match = pattern.exec(cells[0]);

if(match == null) {

console.log("skip", cells);

continue;

}

let msb = Number(match[1]);

let lsb = Number(match[2] || match[1]);

fields.push({

lsb: lsb,

msb: msb,

name: cells[1],

func: cells[2],

});

}

fields.sort((a,b) => a.lsb - b.lsb);

var str = `packed struct(u${fields[fields.length-1].msb+1}) {\n`;

for(const fld of fields) {

let suffix = "";

if(fld.name == "-") {

fld.name = `_reserved${fld.lsb}`;

suffix = " = 0";

}

let size = `${fld.msb}:${fld.lsb}`;

if(fld.msb == fld.lsb) {

size = `${fld.msb}`;

}

str += "\n";

let docs = fld.func.replaceAll("\n\n", "\n").split("\n");

if(docs.length == 1) {

docs[0] = `[${size}] ` + docs[0];

} else {

docs = [`[${size}]`].concat(docs);

}

for(const line of docs)

{

str += ` /// ${line}\n`;

}

str += ` ${fld.name}: u${fld.msb - fld.lsb + 1}${suffix},\n`;

}

str += "}";

console.log(fields);

console.log(str);

const codeblock = document.createElement("textarea");

codeblock.value = str;

codeblock.style.width = "100%";

codeblock.style.fontFamily = "monospace";

codeblock.style.fontSize = "smaller";

codeblock.style.height = "20em";

codeblock.style.resize = "vertical";

const cell = document.createElement("TD");

cell.setAttribute("colspan", 3);

cell.appendChild(codeblock);

const appendix = document.createElement("TR");

appendix.appendChild(cell);

const tbody = document.createElement("TBODY");

tbody.appendChild(cell);

table.appendChild(tbody);

}

}

setTimeout( process, 1000);

})();