String to camelCase helper (#29338)

* string-to-camel helper

* fix:

* Update string-to-camel-test.js

* update comment

* rename and clarify comment

* welp, forgot to update test

ui/app/helpers/string-array-to-camel.js

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: BUSL-1.1
+ */
+
+import { helper as buildHelper } from '@ember/component/helper';
+import { assert } from '@ember/debug';
+
+// This helper is similar to the Ember string camelize helper but it does some additional handling:
+// it allows you to pass in an array of strings
+// it lowercases the entire string before converting to camelCase preventing situations like IAM Endpoint  -> iamEndpoint instead of iAMEndpoint
+// it does not handle accented characters so try not use for user inputted strings.
+export function stringArrayToCamelCase(str) {
+  if (!str) return;
+  if (Array.isArray(str)) {
+    return str.map((s) => {
+      assert(`must pass in a string or array of strings`, typeof s === 'string');
+      // lower case the entire string to handle situations like IAM Endpoint  -> iamEndpoint instead of iAMEndpoint
+      s = s.toLowerCase();
+      return s
+        .replace(/(?:^\w|[A-Z]|\b\w)/g, function (word, index) {
+          return index === 0 ? word.toLowerCase() : word.toUpperCase();
+        })
+        .replace(/\s+/g, '');
+    });
+  } else {
+    // lower case the entire string to handle situations like IAM Endpoint  -> iamEndpoint instead of iAMEndpoint
+    assert(`must pass in a string or array of strings`, typeof str === 'string');
+    str = str.toLowerCase();
+    return str
+      .replace(/(?:^\w|[A-Z]|\b\w)/g, function (word, index) {
+        return index === 0 ? word.toLowerCase() : word.toUpperCase();
+      })
+      .replace(/\s+/g, '');
+  }
+}
+
+export default buildHelper(stringArrayToCamelCase);

ui/tests/integration/helpers/string-array-to-camel-test.js

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: BUSL-1.1
+ */
+
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'vault/tests/helpers';
+import { stringArrayToCamelCase } from 'vault/helpers/string-array-to-camel';
+
+module('Integration | Helper | string-array-to-camel', function (hooks) {
+  setupRenderingTest(hooks);
+
+  test('it returns camelCase string with all caps and two words separated by space', async function (assert) {
+    const string = 'FOO Bar';
+    const expected = 'fooBar';
+    const result = stringArrayToCamelCase(string);
+
+    assert.strictEqual(
+      result,
+      expected,
+      'camelCase string returned for call caps and two words separated by space'
+    );
+  });
+
+  test('it returns an array of camelCased strings if an array of strings passed in', function (assert) {
+    const string = ['FOO Bar', 'Baz Qux', 'wibble wobble', 'wobble WIBBLes'];
+    const expected = ['fooBar', 'bazQux', 'wibbleWobble', 'wobbleWibbles'];
+    const result = stringArrayToCamelCase(string);
+    assert.deepEqual(result, expected, 'camelCase array of strings returned for all sorts of strings');
+  });
+
+  test('it returns string if string is numbers', function (assert) {
+    const string = '123';
+    const expected = '123';
+    const result = stringArrayToCamelCase(string);
+    assert.strictEqual(result, expected, 'camelCase kind of handles strings with numbers');
+  });
+
+  test('it returns error if str is not a string', function (assert) {
+    const string = { name: 'foo.bar*baz' };
+    let result;
+    try {
+      result = stringArrayToCamelCase(string);
+    } catch (e) {
+      result = e.message;
+    }
+    assert.deepEqual(result, 'Assertion Failed: must pass in a string or array of strings');
+  });
+
+  test('it returns error if str is not an array of string', function (assert) {
+    const string = [{ name: 'foo.bar*baz' }];
+    let result;
+    try {
+      result = stringArrayToCamelCase(string);
+    } catch (e) {
+      result = e.message;
+    }
+    assert.deepEqual(result, 'Assertion Failed: must pass in a string or array of strings');
+  });
+});