feat: implement text inspector and case converter tool

lib/base.ts

@@ -20,3 +20,5 @@ export const formatOctal = formatNumber(3, " ");
 export const formatBinary = formatNumber(4, " ");
 
 export const unformatNumber = (x: string) => x.replaceAll(/[ ,]/g, "");
+
+export function noOp() {}

lib/text.ts

@@ -0,0 +1,96 @@
+import * as changeCase from "change-case";
+import { convert as slugify } from "url-slug";
+
+export function countWords(text: string): number {
+  // Split the text by any whitespace (spaces, newlines, tabs, etc.)
+  const words = text.split(/\s+/);
+  // Filter out any empty strings in case there are extra spaces or newlines
+  const filteredWords = words.filter(word => word.length > 0);
+  return filteredWords.length;
+}
+
+export function countCharacters(text: string): number {
+  /** Unicode-proof way to get string length in codepoints (in characters)
+   For example:
+   const text = '👨‍👩‍👧‍👦';
+   text.length === 11;
+   [...new Intl.Segmenter().segment(text)].length === 1;
+   */
+  return [...new Intl.Segmenter().segment(text)].length;
+}
+
+export function countLines(text: string): number {
+  return text.split("\n").length;
+}
+
+export function countBytes(text: string): number {
+  return new Blob([text]).size;
+}
+
+export enum TextTransformMode {
+  original = "original",
+  sentenceCase = "sentenceCase",
+  lowerCase = "lowerCase",
+  upperCase = "upperCase",
+  titleCase = "titleCase",
+  camelCase = "camelCase",
+  pascalCase = "pascalCase",
+  snakeCase = "snakeCase",
+  kebabCase = "kebabCase",
+  constantCase = "constantCase",
+  cobolCase = "cobolCase",
+  trainCase = "trainCase",
+  urlSlugify = "urlSlugify",
+}
+
+export const textTransformModes = Object.values(TextTransformMode);
+
+export const modeTitle = {
+  [TextTransformMode.original]: "OriginalCase",
+  [TextTransformMode.upperCase]: "UPPER CASE",
+  [TextTransformMode.sentenceCase]: "Sentence case",
+  [TextTransformMode.lowerCase]: "lower case",
+  [TextTransformMode.titleCase]: "Title Case",
+  [TextTransformMode.camelCase]: "camelCase",
+  [TextTransformMode.pascalCase]: "PascalCase",
+  [TextTransformMode.snakeCase]: "snake_case",
+  [TextTransformMode.kebabCase]: "kebab-case",
+  [TextTransformMode.constantCase]: "CONSTANT_CASE",
+  [TextTransformMode.cobolCase]: "COBOL-CASE",
+  [TextTransformMode.trainCase]: "Train-Case",
+  [TextTransformMode.urlSlugify]: "url-slufigy",
+};
+
+export function transformText(text: string, mode: TextTransformMode) {
+  switch (mode) {
+    case TextTransformMode.original:
+      return text;
+    case TextTransformMode.upperCase:
+      return text.toUpperCase();
+    case TextTransformMode.sentenceCase:
+      return changeCase.sentenceCase(text);
+    case TextTransformMode.lowerCase:
+      return text.toLowerCase();
+    case TextTransformMode.titleCase:
+      return changeCase.capitalCase(text);
+    case TextTransformMode.camelCase:
+      return changeCase.camelCase(text);
+    case TextTransformMode.pascalCase:
+      return changeCase.pascalCase(text);
+    case TextTransformMode.kebabCase:
+      return changeCase.kebabCase(text);
+    case TextTransformMode.snakeCase:
+      return changeCase.snakeCase(text);
+    case TextTransformMode.cobolCase:
+      return changeCase.constantCase(text, { delimiter: "-" });
+    case TextTransformMode.constantCase:
+      return changeCase.constantCase(text);
+    case TextTransformMode.trainCase:
+      return changeCase.trainCase(text);
+    case TextTransformMode.urlSlugify:
+      return slugify(text);
+
+    default:
+      return text;
+  }
+}