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;
 15module.exports.accSizes2Str = accSizes2Str;
 16
 17function ident(text) {
 18    if (typeof text === "string") {
 19        let lines = text.split("\n");
 20        for (let i=0; i<lines.length; i++) {
 21            if (lines[i]) lines[i] = "    "+lines[i];
 22        }
 23        return lines.join("\n");
 24    } else if (Array.isArray(text)) {
 25        for (let i=0; i<text.length; i++ ) {
 26            text[i] = ident(text[i]);
 27        }
 28        return text;
 29    }
 30}
 31
 32function extractSizes (o) {
 33    if (! Array.isArray(o)) return [];
 34    return [o.length, ...extractSizes(o[0])];
 35}
 36
 37function flatArray(a) {
 38    var res = [];
 39    fillArray(res, a);
 40    return res;
 41
 42    function fillArray(res, a) {
 43        if (Array.isArray(a)) {
 44            for (let i=0; i<a.length; i++) {
 45                fillArray(res, a[i]);
 46            }
 47        } else {
 48            res.push(bigInt(a));
 49        }
 50    }
 51}
 52
 53// Input [1,2,3]
 54// Returns " ,1 ,2, 3"
 55function csArr(_arr) {
 56    let S = "";
 57    const arr = _arr || [];
 58    for (let i=0; i<arr.length; i++) {
 59        S = " ,"+arr[i];
 60    }
 61    return S;
 62}
 63
 64function accSizes(_sizes) {
 65    const sizes = _sizes || [];
 66    const accSizes = [1, 0];
 67    for (let i=sizes.length-1; i>=0; i--) {
 68        accSizes.unshift(accSizes[0]*sizes[i]);
 69    }
 70    return accSizes;
 71}
 72
 73function fnvHash(str) {
 74    return fnv.hash(str, 64).hex();
 75}
 76
 77
 78
 79function stringifyBigInts(o) {
 80    if ((typeof(o) == "bigint") || o.isZero !== undefined)  {
 81        return o.toString(10);
 82    } else if (Array.isArray(o)) {
 83        return o.map(stringifyBigInts);
 84    } else if (typeof o == "object") {
 85        const res = {};
 86        for (let k in o) {
 87            res[k] = stringifyBigInts(o[k]);
 88        }
 89        return res;
 90    } else {
 91        return o;
 92    }
 93}
 94
 95
 96
 97function unstringifyBigInts(o) {
 98    if ((typeof(o) == "string") && (/^[0-9]+$/.test(o) ))  {
 99        return bigInt(o);
100    } else if (Array.isArray(o)) {
101        return o.map(unstringifyBigInts);
102    } else if (typeof o == "object") {
103        const res = {};
104        for (let k in o) {
105            res[k] = unstringifyBigInts(o[k]);
106        }
107        return res;
108    } else {
109        return bigInt(o);
110    }
111}
112
113function sameSizes(s1, s2) {
114    if (!Array.isArray(s1)) return false;
115    if (!Array.isArray(s2)) return false;
116    if (s1.length != s2.length) return false;
117    for (let i=0; i<s1.length; i++) {
118        if (s1[i] != s2[i]) return false;
119    }
120    return true;
121}
122
123function isDefined(v) {
124    return ((typeof(v) != "undefined")&&(v != null));
125}
126
127function accSizes2Str(sizes) {
128    if (sizes.length == 2) return "";
129    return `[${sizes[0]/sizes[1]}]`+accSizes2Str(sizes.slice(1));
130}
131
132
133
134