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.accSizes = accSizes;
 10module.exports.fnvHash = fnvHash;
 11module.exports.stringifyBigInts = stringifyBigInts;
 12module.exports.unstringifyBigInts = unstringifyBigInts;
 13module.exports.sameSizes = sameSizes;
 14module.exports.isDefined = isDefined;
 15
 16function ident(text) {
 17    let lines = text.split("\n");
 18    for (let i=0; i<lines.length; i++) {
 19        if (lines[i]) lines[i] = "    "+lines[i];
 20    }
 21    return lines.join("\n");
 22}
 23
 24function extractSizes (o) {
 25    if (! Array.isArray(o)) return [];
 26    return [o.length, ...extractSizes(o[0])];
 27}
 28
 29function flatArray(a) {
 30    var res = [];
 31    fillArray(res, a);
 32    return res;
 33
 34    function fillArray(res, a) {
 35        if (Array.isArray(a)) {
 36            for (let i=0; i<a.length; i++) {
 37                fillArray(res, a[i]);
 38            }
 39        } else {
 40            res.push(a);
 41        }
 42    }
 43}
 44
 45// Input [1,2,3]
 46// Returns " ,1 ,2, 3"
 47function csArr(_arr) {
 48    let S = "";
 49    const arr = _arr || [];
 50    for (let i=0; i<arr.length; i++) {
 51        S = " ,"+arr[i];
 52    }
 53    return S;
 54}
 55
 56function accSizes(_sizes) {
 57    const sizes = _sizes || [];
 58    const accSizes = [1, 0];
 59    for (let i=sizes.length-1; i>=0; i--) {
 60        accSizes.unshift(accSizes[0]*sizes[i]);
 61    }
 62    return accSizes;
 63}
 64
 65function fnvHash(str) {
 66    return fnv.hash(str, 64).hex();
 67}
 68
 69
 70
 71function stringifyBigInts(o) {
 72    if ((typeof(o) == "bigint") || o.isZero !== undefined)  {
 73        return o.toString(10);
 74    } else if (Array.isArray(o)) {
 75        return o.map(stringifyBigInts);
 76    } else if (typeof o == "object") {
 77        const res = {};
 78        for (let k in o) {
 79            res[k] = stringifyBigInts(o[k]);
 80        }
 81        return res;
 82    } else {
 83        return o;
 84    }
 85}
 86
 87
 88
 89function unstringifyBigInts(o) {
 90    if ((typeof(o) == "string") && (/^[0-9]+$/.test(o) ))  {
 91        return bigInt(o);
 92    } else if (Array.isArray(o)) {
 93        return o.map(unstringifyBigInts);
 94    } else if (typeof o == "object") {
 95        const res = {};
 96        for (let k in o) {
 97            res[k] = unstringifyBigInts(o[k]);
 98        }
 99        return res;
100    } else {
101        return o;
102    }
103}
104
105function sameSizes(s1, s2) {
106    if (!Array.isArray(s1)) return false;
107    if (!Array.isArray(s2)) return false;
108    if (s1.length != s2.length) return false;
109    for (let i=0; i<s1.length; i++) {
110        if (s1[i] != s2[i]) return false;
111    }
112    return true;
113}
114
115function isDefined(v) {
116    return ((typeof(v) != "undefined")&&(v != null));
117}
118
119
120