cdk-s3-vectors/node_modules/strnum/strnum.js

A CDK construct library for Amazon S3 Vectors. This construct simplifies the creation of vector buckets, vector indexes with full configuration options, and Amazon Bedrock knowledge bases using S3 Vectors as the underlying vector store.

const hexRegex = /^[-+]?0x[a-fA-F0-9]+$/;
const numRegex = /^([\-\+])?(0*)([0-9]*(\.[0-9]*)?)$/;
// const octRegex = /^0x[a-z0-9]+/;
// const binRegex = /0x[a-z0-9]+/;

 
const consider = {
    hex :  true,
    // oct: false,
    leadingZeros: true,
    decimalPoint: "\.",
    eNotation: true,
    //skipLike: /regex/
};

export default function toNumber(str, options = {}){
    options = Object.assign({}, consider, options );
    if(!str || typeof str !== "string" ) return str;
    
    let trimmedStr  = str.trim();
    
    if(options.skipLike !== undefined && options.skipLike.test(trimmedStr)) return str;
    else if(str==="0") return 0;
    else if (options.hex && hexRegex.test(trimmedStr)) {
        return parse_int(trimmedStr, 16);
    // }else if (options.oct && octRegex.test(str)) {
    //     return Number.parseInt(val, 8);
    }else if (trimmedStr.search(/.+[eE].+/)!== -1) { //eNotation
        return resolveEnotation(str,trimmedStr,options);
    // }else if (options.parseBin && binRegex.test(str)) {
    //     return Number.parseInt(val, 2);
    }else{
        //separate negative sign, leading zeros, and rest number
        const match = numRegex.exec(trimmedStr);
        // +00.123 => [ , '+', '00', '.123', ..
        if(match){
            const sign = match[1] || "";
            const leadingZeros = match[2];
            let numTrimmedByZeros = trimZeros(match[3]); //complete num without leading zeros
            const decimalAdjacentToLeadingZeros = sign ? // 0., -00., 000.
                str[leadingZeros.length+1] === "." 
                : str[leadingZeros.length] === ".";

            //trim ending zeros for floating number
            if(!options.leadingZeros //leading zeros are not allowed
                && (leadingZeros.length > 1 
                    || (leadingZeros.length === 1 && !decimalAdjacentToLeadingZeros))){
                // 00, 00.3, +03.24, 03, 03.24
                return str;
            }
            else{//no leading zeros or leading zeros are allowed
                const num = Number(trimmedStr);
                const parsedStr = String(num);

                if( num === 0) return num;
                if(parsedStr.search(/[eE]/) !== -1){ //given number is long and parsed to eNotation
                    if(options.eNotation) return num;
                    else return str;
                }else if(trimmedStr.indexOf(".") !== -1){ //floating number
                    if(parsedStr === "0") return num; //0.0
                    else if(parsedStr === numTrimmedByZeros) return num; //0.456. 0.79000
                    else if( parsedStr === `${sign}${numTrimmedByZeros}`) return num;
                    else return str;
                }
                
                let n = leadingZeros? numTrimmedByZeros : trimmedStr;
                if(leadingZeros){
                    // -009 => -9
                    return (n === parsedStr) || (sign+n === parsedStr) ? num : str
                }else  {
                    // +9
                    return (n === parsedStr) || (n === sign+parsedStr) ? num : str
                }
            }
        }else{ //non-numeric string
            return str;
        }
    }
}

const eNotationRegx = /^([-+])?(0*)(\d*(\.\d*)?[eE][-\+]?\d+)$/;
function resolveEnotation(str,trimmedStr,options){
    if(!options.eNotation) return str;
    const notation = trimmedStr.match(eNotationRegx); 
    if(notation){
        let sign = notation[1] || "";
        const eChar = notation[3].indexOf("e") === -1 ? "E" : "e";
        const leadingZeros = notation[2];
        const eAdjacentToLeadingZeros = sign ? // 0E.
            str[leadingZeros.length+1] === eChar 
            : str[leadingZeros.length] === eChar;

        if(leadingZeros.length > 1 && eAdjacentToLeadingZeros) return str;
        else if(leadingZeros.length === 1 
            && (notation[3].startsWith(`.${eChar}`) || notation[3][0] === eChar)){
                return Number(trimmedStr);
        }else if(options.leadingZeros && !eAdjacentToLeadingZeros){ //accept with leading zeros
            //remove leading 0s
            trimmedStr = (notation[1] || "") + notation[3];
            return Number(trimmedStr);
        }else return str;
    }else{
        return str;
    }
}

/**
 * 
 * @param {string} numStr without leading zeros
 * @returns 
 */
function trimZeros(numStr){
    if(numStr && numStr.indexOf(".") !== -1){//float
        numStr = numStr.replace(/0+$/, ""); //remove ending zeros
        if(numStr === ".")  numStr = "0";
        else if(numStr[0] === ".")  numStr = "0"+numStr;
        else if(numStr[numStr.length-1] === ".")  numStr = numStr.substring(0,numStr.length-1);
        return numStr;
    }
    return numStr;
}

function parse_int(numStr, base){
    //polyfill
    if(parseInt) return parseInt(numStr, base);
    else if(Number.parseInt) return Number.parseInt(numStr, base);
    else if(window && window.parseInt) return window.parseInt(numStr, base);
    else throw new Error("parseInt, Number.parseInt, window.parseInt are not supported")
}