add hw2

node_modules/yargs-parser/build/lib/string-utils.js

@@ -0,0 +1,65 @@
+/**
+ * @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);
+}