DeMangle.js

let nums = "1234567890";
let alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
let specials = ["string", "uint", "int", "utf"];
let bts = ["8", "16", "32", "64"];

let badEnds = ["Ev", "Ei", "Em", "Im", "If", "Pb", "Ia", "Id", "Ii", "Ib", "Ih", "Ej", "Ea", "Fds", "Eb", "Il", "Ef", "Ic", "El", "Pi"];
//First check if it ends with a Cap then a Lower case combo then Clean that out
//For ones like "EmmPb" hmm
//Typically at ends so we can split string by the "." then clean out ends ?
//Was used no longer at use
//let hidChars = ["_Hidl_", "_hidl_", "hidl_", "Hidl_", "_hidl", "_Hidl", ".hidl.", ".Hidl.", ".hidl", ".Hidl", "hidl.", "Hidl.", "hidl", "Hidl"];

function demangle(mangledName) {
    function clearArray(array) {
        while (array.length > 0) {
            array.pop();
        }
    }

    function isMangled(str) { return str.startsWith("_Z"); }
    function isNumber(ch) { return nums.includes(ch); }
    function isAlpha(ch) {  return alpha.includes(ch);  }
    //function hasSpecial(str) { return specials.includes(str.toLowerCase()); }

    function hasSpecial(str) {
        let low = str.toLowerCase();
        for (let s of specials) {
            if (low.endsWith(s)) {
                return true;
            }
        }
        return false;
    }

    function isLower(ch) {  return ch === ch.toLowerCase() && ch !== ch.toUpperCase(); }
    function isUpper(ch) {  return !isLower(ch);   }
    function isBadChar(ch) { return ch === "_" || isNumber(ch); }

    function pushCurrent(part, pts) {
        let begCaps = 0;
        if (part !== "" && part.length > 1) {
            for (let i = 0; i < part.length; i++) {
                let ch = part.charAt(i);
                if (isUpper(ch)) {
                    begCaps++;
                } else {
                    break;
                }
            }

            if (begCaps > 2)
                return;

            //check between 3 & 4 we dont want like "IPb" "IPbc"
            if (begCaps === 2 && (part.length === 3 || part.length === 4))
                return;

            pts.push(part);
        }
    }

    function pushToParts(part, pts) {
        if (pts.length === 0) {
            if (part !== "" && part.length > 4) {
                //for beg part we want to try to exceed 4 Chars ?
                pts.push(part);
                return hasSpecial(part);
            }
        } else {
            if (part !== "" && part.length > 1) {
                if (part.length === 2) {
                    let chr = part.charAt(0);
                    if (isUpper(chr)) {
                        let last = pts.pop();
                        pts.push(last + part);
                        return;
                    }
                }
                pts.push(part);
                return hasSpecial(part);
            }
        }

        return false;
    }

    if (!isMangled(mangledName))
        return mangledName;

    mangledName = mangledName.replace("_Z", "");

    let parts = [];
    //If Capital expect to follow with non caps if not its part of the mangling
    //Find Capitals follow
    //if all lower case that can be possible

    let current = "";
    let currentParts = [];
    let expectLower = false;

    let lastWasCap = false;

    let lastWasSpecial = false;
    let lastEndedInNum = false;
    let extNums = "";

    for (let i = 0; i < mangledName.length; i++) {
        //If caps next couple chars should follow as lower Case
        let ch = mangledName.charAt(i);

        if (isAlpha(ch)) {
            if (lastEndedInNum && current === "" && parts.length > 0) {
                let last = parts.pop();
                current = last;
                lastEndedInNum = false;
            }

            if (isUpper(ch)) {
                if (!expectLower)
                    expectLower = true;

                if (current !== "") {
                    if (!lastWasCap) {
                        //check if last was upper encase "IBinder" "IB"
                        //currentParts.push(current);
                        pushCurrent(current, currentParts);
                        current = "";
                    }
                }

                current = current + ch;
                if (!lastWasCap)
                    lastWasCap = true;

            } else {
                if (lastWasCap)
                    lastWasCap = false;

                if (expectLower)
                    expectLower = false;

                current = current + ch;
            }
        } else {
            if (isBadChar(ch)) {
                if (lastEndedInNum)
                    lastEndedInNum = false;

                if (expectLower) {
                    //ignore current part as it was like "BpBinderEL1" (we want to ignore "EL")
                    //We should at this point append parts to the main part
                    //It should look like parts = [ "Bp", "Binder" ] not including "EL"
                    expectLower = false;
                    if (current !== "")
                        current = "";

                    if (currentParts.length > 0) {
                        let pt = currentParts.join('');
                        clearArray(currentParts);
                        if (pt !== "") {
                            pushToParts(pt, parts);
                            //parts.push(pt);
                        }
                    }
                } else {
                    if (ch === "_" && current !== "") {
                        let lastChar = current.charAt(current.length - 1);
                        if (isAlpha(lastChar) && isLower(lastChar)) {
                            if (mangledName.length - 1 > i) {
                                let nextChar = mangledName.charAt(i + 1);
                                if (isAlpha(nextChar) && isLower(nextChar)) {
                                    current = current + "_";
                                    continue;
                                }
                            }
                        }
                    }

                    //It dosnt expect a lower but had a Number or Underscore
                    //BpBinder12_ or BpBinder_44
                    if (current !== "") {
                        //currentParts.push(current);
                        pushCurrent(current, currentParts);
                        current = "";
                        lastWasSpecial = false;
                    }

                    if (currentParts.length > 0) {
                        let pt = currentParts.join('');
                        clearArray(currentParts);
                        if (pt !== "") {
                            lastWasSpecial = pushToParts(pt, parts);
                            //parts.push(pt);
                        }
                    }

                    if (lastWasSpecial && isNumber(ch)) {
                        extNums = extNums + ch;
                        if (bts.includes(extNums)) {
                            let last = parts.pop();
                            parts.push(last + extNums);
                            extNums = "";
                            lastWasSpecial = false;
                            lastEndedInNum = true;
                        }
                    }
                }
            }
        }
    }

    if (!lastWasCap && current.length !== "") {
        //currentParts.push(current);
        pushCurrent(current, currentParts);
        current = "";
    }

    if (currentParts.length > 0) {
        let pt = currentParts.join('');
        clearArray(currentParts);
        if (pt !== "") {
            pushToParts(pt, parts);
        }
    }

    let finalParts = [];
    for (let p of parts) {
        if (p.length < 6) {
            let fIx = -1;
            for (let b of badEnds) {
                let ix = p.indexOf(b);
                if (ix > -1) {
                    if (ix < fIx || fIx === -1)
                        fIx = ix;
                    if (fIx === 0)
                        break;
                }
            }

            let tStr = p;
            if (fIx > -1) {
                if (fIx === 0)
                    continue;
                tStr = p.slice(0, fIx);
                if (tStr.length < 2)
                    continue;
            }

            let allSameChars = true;
            let c = tStr.charAt(0);
            for (let ic = 1; ic < tStr.length; ic++) {
                let chr = tStr.charAt(ic);
                if (chr !== c) {
                    allSameChars = false;
                    break;
                }
            }

            if (allSameChars)
                continue;

            finalParts.push(tStr);
        } else {
            let fIx = 0;
            for (let b of badEnds) {
                let ix = p.indexOf(b);
                if (ix > 2) {
                    //so it was found
                    //now who has the "lowest" index
                    if (fIx === 0) {
                        fIx = ix;
                    } else if (fIx > ix) {
                        fIx = ix;
                        if (ix === 3)
                            break;
                    }
                }
            }
            if (fIx > 2) finalParts.push(p.slice(0, fIx));
            else finalParts.push(p);
        }
    }

    if (finalParts.length > 0)
        return finalParts.join('.')
            .replaceAll("Hidl", "")
            .replaceAll("hidl", "")
            .replaceAll("..", ".")
            .replaceAll("__", "_")
            .replaceAll("._", ".")
            .replaceAll("_.", ".");

    return mangledName;
}
//Will later add function to get just class Name and Function instead of Name Space what not

//Below is Example code it is not needed you can delete
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