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/**
 * @license
 * Copyright (c) 2016, Contributors
 * SPDX-License-Identifier: ISC
 */
export function camelCase(str) {
    // Handle the case where an argument is provided as camel case, e.g., fooBar.
    // by ensuring that the string isn't already mixed case:
    const isCamelCase = str !== str.toLowerCase() && str !== str.toUpperCase();
    if (!isCamelCase) {
        str = str.toLowerCase();
    }
    if (str.indexOf('-') === -1 && str.indexOf('_') === -1) {
        return str;
    }
    else {
        let camelcase = '';
        let nextChrUpper = false;
        const leadingHyphens = str.match(/^-+/);
        for (let i = leadingHyphens ? leadingHyphens[0].length : 0; i < str.length; i++) {
            let chr = str.charAt(i);
            if (nextChrUpper) {
                nextChrUpper = false;
                chr = chr.toUpperCase();
            }
            if (i !== 0 && (chr === '-' || chr === '_')) {
                nextChrUpper = true;
            }
            else if (chr !== '-' && chr !== '_') {
                camelcase += chr;
            }
        }
        return camelcase;
    }
}
export function decamelize(str, joinString) {
    const lowercase = str.toLowerCase();
    joinString = joinString || '-';
    let notCamelcase = '';
    for (let i = 0; i < str.length; i++) {
        const chrLower = lowercase.charAt(i);
        const chrString = str.charAt(i);
        if (chrLower !== chrString && i > 0) {
            notCamelcase += `${joinString}${lowercase.charAt(i)}`;
        }
        else {
            notCamelcase += chrString;
        }
    }
    return notCamelcase;
}
export function looksLikeNumber(x) {
    if (x === null || x === undefined)
        return false;
    // if loaded from config, may already be a number.
    if (typeof x === 'number')
        return true;
    // hexadecimal.
    if (/^0x[0-9a-f]+$/i.test(x))
        return true;
    // don't treat 0123 as a number; as it drops the leading '0'.
    if (/^0[^.]/.test(x))
        return false;
    return /^[-]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);
}