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