double-double/node/str-to-dd/normalize-str.js

Pure double-double precision functions *with strict error bounds*.

import { getNumLeadingZerosAfterPoint } from "./get-num-leading-zeros-after-point.js";
import { getNumLeadingZerosBeforePoint } from "./get-num-leading-zeros-before-point.js";
import { d } from "./num-significant-digits.js";
import { extractExp } from './extract-exp.js';
/**
 *
 * @param s
 *
 * @internal
 */
function normalizeStr(s) {
    if (Number(s) === 0) {
        return { str: '0', exp: 0, negative: false };
    }
    const negative = s.startsWith('-');
    if (negative) {
        s = s.slice(1);
    }
    let exp = 0;
    ({ s, exp } = extractExp(s));
    let str;
    const z = getNumLeadingZerosAfterPoint(s);
    if (z > 0) {
        s = s.slice(z + 1);
        str = s[0] + '.' + s.slice(1);
        exp = exp - z;
    }
    else {
        const Z = getNumLeadingZerosBeforePoint(s);
        s = s.split('').filter(s => s !== '.').join('');
        str = s[0] + '.' + s.slice(1);
        exp = exp + Z - 1;
    }
    str = str.slice(0, 3 * d + 1);
    if (str.length < 3 * d + 1) {
        const zeros = new Array(3 * d + 1 - str.length).join('0');
        str += zeros;
    }
    return { str, exp, negative };
}
export { normalizeStr };
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