1const fnv = require("fnv-plus");
  2const bigInt = require("big-integer");
  3
  4module.exports.ident =ident;
  5
  6module.exports.extractSizes =extractSizes;
  7module.exports.flatArray = flatArray;
  8module.exports.csArr = csArr;
  9module.exports.subArray = subArray;
 10module.exports.accSizes = accSizes;
 11module.exports.fnvHash = fnvHash;
 12module.exports.stringifyBigInts = stringifyBigInts;
 13module.exports.unstringifyBigInts = unstringifyBigInts;
 14
 15function ident(text) {
 16    let lines = text.split("\n");
 17    for (let i=0; i<lines.length; i++) {
 18        if (lines[i]) lines[i] = "    "+lines[i];
 19    }
 20    return lines.join("\n");
 21}
 22
 23function extractSizes (o) {
 24    if (! Array.isArray(o)) return [];
 25    return [o.length, ...extractSizes(o[0])];
 26}
 27
 28function flatArray(a) {
 29    var res = [];
 30    fillArray(res, a);
 31    return res;
 32
 33    function fillArray(res, a) {
 34        if (Array.isArray(a)) {
 35            for (let i=0; i<a.length; i++) {
 36                fillArray(res, a[i]);
 37            }
 38        } else {
 39            res.push(a);
 40        }
 41    }
 42}
 43
 44// Input [1,2,3]
 45// Returns " ,1 ,2, 3"
 46function csArr(_arr) {
 47    let S = "";
 48    const arr = _arr || [];
 49    for (let i=0; i<arr.length; i++) {
 50        S = " ,"+arr[i];
 51    }
 52    return S;
 53}
 54
 55function subArray(value, sels) {
 56    if ((!sels) || (sels.length == 0)) return value;
 57
 58    return subArray(value[sels[0]], sels.slice(1));
 59}
 60
 61function accSizes(_sizes) {
 62    const sizes = _sizes || [];
 63    const accSizes = [1, 0];
 64    for (let i=sizes.length-1; i>=0; i--) {
 65        accSizes.unshift(accSizes[0]*sizes[i]);
 66    }
 67    return accSizes;
 68}
 69
 70function fnvHash(str) {
 71    return fnv.hash(str, 64).hex();
 72}
 73
 74
 75
 76function stringifyBigInts(o) {
 77    if ((typeof(o) == "bigint") || o.isZero !== undefined)  {
 78        return o.toString(10);
 79    } else if (Array.isArray(o)) {
 80        return o.map(stringifyBigInts);
 81    } else if (typeof o == "object") {
 82        const res = {};
 83        for (let k in o) {
 84            res[k] = stringifyBigInts(o[k]);
 85        }
 86        return res;
 87    } else {
 88        return o;
 89    }
 90}
 91
 92function unstringifyBigInts(o) {
 93    if ((typeof(o) == "string") && (/^[0-9]+$/.test(o) ))  {
 94        return bigInt(o);
 95    } else if (Array.isArray(o)) {
 96        return o.map(unstringifyBigInts);
 97    } else if (typeof o == "object") {
 98        const res = {};
 99        for (let k in o) {
100            res[k] = unstringifyBigInts(o[k]);
101        }
102        return res;
103    } else {
104        return o;
105    }
106}
107
108
109