Trim Label

trimlabelFilter.js

// truncate text
function trimMiddle (text, maxLength, div) {
  const d = div || ' '
  const l = text.length
  let t
  let a
  let b

  if (l > maxLength) {
    a = Math.floor((maxLength / 2) - 1)
    b = (l - Math.ceil((maxLength / 2) + 1))

    t = text.substring(0, a) +
            d +
            text.substring(b, l)
  } else {
    t = text
  }

  return t
}

// function subscript (text, script) {
//   const prefix =
//   return
// }

export function truncate (input, maxLength, char) {
  const start = 0
  const max = maxLength || 30
  const divSymbol = char || '…'
  let text
  let edited
  let stop
  let divider
  let alpha
  let beta

  if (!input) {
    return
  }

  text = input
  stop = text.length
  divider = text.indexOf('-')

  if (text.length > max) {
        // break apart ALPHA - BETA
    if (divider > -1) {
            // remove all spaces from ALPHA
      alpha = text.substring(start, divider)
                .replace(/\s/g, '')
            // truncate 1/3 of max
      alpha = trimMiddle(alpha, Math.floor(max / 3), divSymbol)

            // get BETA
      beta = text.substring(divider, stop)
            // remove leading space from BETA
            // if (beta.indexOf(' ') === 0) {
            //     beta = beta.substring(1, beta.length);
            // }
            // truncate 2/3 of max
      beta = trimMiddle(beta, Math.floor((max / 3) * 2), divSymbol)
      edited = alpha + ' ' + beta
    } else {
      edited = trimMiddle(text, max, divSymbol)
    }
  } else {
    edited = text
  }

  return edited
}