AuroraForEach/forEach.js

var fs = require("fs")
var n = 100
var subn = 10

function forN(n, cb) {
    for (var i = 0; i < n; i++) {
        cb(i)
    }
}

function formatNJoin(n, start, join) {
    return start + [...Array(n).keys()].join(join)
}

function formatNJoinReverse(n, start, join) {
    return start + [...Array(n).keys()].reverse().join(join)
}

function formatNJoinReverseSuffix(n, start, join, suffix) {
    return start + [...Array(n).keys()].reverse().join(suffix + join) + suffix
}


function formatNJoinReverse(n, start, join) {
    return start + [...Array(n).keys()].reverse().join(join)
}

function formatNParamPattern(n, join) {
    return formatNJoin(n, join, ", " + join)
}

function formatNParamPatternReverse(n, join) {
    return formatNJoinReverse(n, join, ", " + join)
}


function formatNParamPatternReverseSuffix(n, join, suffix) {
    return formatNJoinReverseSuffix(n, join, ", " + join, suffix)
}

var textBuffer = ""

textBuffer += 
`/**
 * X-Macro alternative. Defines AU_FOR_EACH_N(expandable, ...args*N)
 * Autogenerated by forEach.js; do not modify"
 */

#define AU_FE_EXPAND(exp) exp
#define AU_FE_ERROR(exp) ERROR. CHECK PARAMETER COUNT. DID YOU FORGET A COMMA?
`

forN(subn, function(subN) {
    if (!subN) return
    var suffix = subN != 1 ? "_" + (subN): ""
    var suffix2 = subN != 1 ? "_" + (subN): ""
    var re = Math.min(127 - 3, n * subN)
    var ignoreList = {}
    var ignoreList2 = {}
    forN(re, function(i) {
        
        if (i == 0) textBuffer += `#define AU_FE_0${suffix}(prefix) \n`
        else {
            var X = formatNParamPattern(subN, "X")
            var iM1 = i - 1
            var iM1Translated = i - subN
            var iM1Translated2 = (i - 1) - subN
            if (subN == 1) {
                textBuffer += `#define AU_FE_${i}${suffix}(prefix, ${X}, ...)                  prefix(${X}) AU_FE_EXPAND(AU_FE_${iM1}${suffix}(prefix, __VA_ARGS__))\n`
            } else if (i % subN == 0) {
                if (i == subN) {
                    textBuffer += `#define AU_FE_${i}${suffix}(prefix, ${X})                   prefix(${X}) AU_FE_EXPAND(AU_FE_${iM1Translated}${suffix}(prefix))\n`
                } else {
                    textBuffer += `#define AU_FE_${i}${suffix}(prefix, ${X}, ...)              prefix(${X}) AU_FE_EXPAND(AU_FE_${iM1Translated}${suffix}(prefix, __VA_ARGS__))\n`
                }
                
            } else {
                ignoreList[`AU_FE_${i}${suffix}`] = true
            }
            
            var I2 = i + 1
            if (i < subN) {
                textBuffer += `#define AU_FE_${i}_FIRST${suffix2}(first, prefix, ${X}) \n`
            } else if (I2 % (subN) == 0) {
                if ((i - 1) == subN) {
                    textBuffer += `#define AU_FE_${i}_FIRST${suffix2}(first, prefix, ${X})      first(${X}) AU_FE_EXPAND(AU_FE_${iM1Translated2}${suffix}(prefix))\n`
                } else {
                    textBuffer += `#define AU_FE_${i}_FIRST${suffix2}(first, prefix, ${X}, ...) first(${X}) AU_FE_EXPAND(AU_FE_${iM1Translated2}${suffix}(prefix, __VA_ARGS__))\n`
                }  
            } else {
                ignoreList2[`AU_FE_${i}_FIRST${suffix2}`] = true
            }
        }
    })
    
    var GET_MACRO_PARAMS = formatNParamPattern(re, "_")
    textBuffer += `#define AU_GET_MACRO${suffix}(${GET_MACRO_PARAMS}, NAME,...) NAME\n`
    
    var params =  formatNParamPatternReverseSuffix(re, "AU_FE_", suffix)
    var params2 =  formatNParamPatternReverseSuffix(re, "AU_FE_", "_FIRST" + suffix)
    
    params = params.split(", ").map((str) => { return ignoreList[str] ? "AU_FE_ERROR" : str}).join(", ")
    params2 = params2.split(", ").map((str) => { return ignoreList2[str] ? "AU_FE_ERROR" : str}).join(", ")
    
    textBuffer += `#define AU_FOR_EACH${suffix}(action, ...) AU_FE_EXPAND(AU_GET_MACRO${suffix}(_whydoweneedthis, __VA_ARGS__, ${params})(action,__VA_ARGS__))\n`
    textBuffer += `#define AU_FOR_EACH_FIRST${suffix}(action, ...) AU_FE_EXPAND(AU_GET_MACRO${suffix}(_whydoweneedthis, __VA_ARGS__, ${params2})(action,__VA_ARGS__))`
    
    textBuffer += "\n\n"
})

fs.writeFileSync("./Include/AuroraForEach.hpp", textBuffer)