myex-cli/lib/utils/string-utils.js

Opinionated Express.js framework with CLI tools

/**
 * Convert a string to pascal case (MyVariable)
 * @param {string} str - Input string
 * @returns {string} Pascal cased string
 */
export function pascalCase(str) {
  return str
    .split(/[-_\s]+/)
    .map(word => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
    .join('');
}

/**
 * Convert a string to camel case (myVariable)
 * @param {string} str - Input string
 * @returns {string} Camel cased string
 */
export function camelCase(str) {
  const pascal = pascalCase(str);
  return pascal.charAt(0).toLowerCase() + pascal.slice(1);
}

/**
 * Convert a string to kebab case (my-variable)
 * @param {string} str - Input string
 * @returns {string} Kebab cased string
 */
export function kebabCase(str) {
  return str
    .replace(/([a-z])([A-Z])/g, '$1-$2')
    .replace(/[\s_]+/g, '-')
    .toLowerCase();
}

/**
 * Convert a string to snake case (my_variable)
 * @param {string} str - Input string
 * @returns {string} Snake cased string
 */
export function snakeCase(str) {
  return str
    .replace(/([a-z])([A-Z])/g, '$1_$2')
    .replace(/[\s-]+/g, '_')
    .toLowerCase();
}

/**
 * Pluralize a word using common English rules
 * @param {string} str - Input string
 * @returns {string} Pluralized string
 */
export function pluralize(str) {
  // Handle some irregular plurals
  const irregulars = {
    'person': 'people',
    'child': 'children',
    'man': 'men',
    'woman': 'women',
    'tooth': 'teeth',
    'foot': 'feet',
    'mouse': 'mice',
    'goose': 'geese'
  };
  
  if (irregulars[str.toLowerCase()]) {
    return irregulars[str.toLowerCase()];
  }
  
  // Handle words ending in y
  if (str.match(/[^aeiou]y$/i)) {
    return str.replace(/y$/i, 'ies');
  }
  
  // Handle words ending in s, x, z, ch, sh
  if (str.match(/s$|x$|z$|ch$|sh$/i)) {
    return str + 'es';
  }
  
  // Default: just add s
  return str + 's';
}

/**
 * Singularize a word using common English rules (approximate)
 * @param {string} str - Input string
 * @returns {string} Singularized string
 */
export function singularize(str) {
  // Handle some irregular plurals
  const irregulars = {
    'people': 'person',
    'children': 'child',
    'men': 'man',
    'women': 'woman',
    'teeth': 'tooth',
    'feet': 'foot',
    'mice': 'mouse',
    'geese': 'goose'
  };
  
  if (irregulars[str.toLowerCase()]) {
    return irregulars[str.toLowerCase()];
  }
  
  // Handle words ending in ies
  if (str.match(/ies$/i)) {
    return str.replace(/ies$/i, 'y');
  }
  
  // Handle words ending in es
  if (str.match(/ses$|xes$|zes$|ches$|shes$/i)) {
    return str.replace(/es$/i, '');
  }
  
  // Default: just remove s
  if (str.match(/s$/i) && !str.match(/ss$/i)) {
    return str.replace(/s$/i, '');
  }
  
  return str;
}