node-scrapy/lib/filters.js

Simple, lightweight and expressive web scraping with Node.js

/**
 * Strips excess of whitespace
 * @static
 * @public
 * @param  {string} input String to be normalized
 * @return {string} Normalized string
 */

function normalizeWhitespace(input) {
  return input.replace(/\s+/g, ' ')
}

/**
 * Prefixes an affix to the input
 * @static
 * @public
 * @param  {string} input Sring to be prefixed
 * @param  {string} affix Affix to be prefixed
 * @return {string} Prefixed input
 */

function prefix(input, affix) {
  return affix + input
}

/**
 * Suffixes an affix to the input
 * @static
 * @public
 * @param  {string} input Sring to be suffixed
 * @param  {string} affix Affix to be suffixed
 * @return {string} Suffixed input
 */

function suffix(input, affix) {
  return input + affix
}

/**
 * Trims leading or trailing whitespace, or both
 * @static
 * @public
 * @param  {string} input String to be trimmed
 * @param  {string} [side=both] What side to trim
 * @return {string} Trimed string
 */

function trim(input, side = 'both') {
  let result = input

  if (side === 'both' || side === 'left') {
    result = result.replace(/^\s*/, '')
  }

  if (side === 'both' || side === 'right') {
    result = result.replace(/\s*$/, '')
  }

  return result
}

module.exports = {
  normalizeWhitespace,
  prefix,
  suffix,
  trim,
}