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Edit File : utils.js \| Size : 4.75 KB
"use strict" var wcwidth = require('./width') /** * repeat string `str` up to total length of `len` * * @param String str string to repeat * @param Number len total length of output string / function repeatString(str, len) { return Array.apply(null, {length: len + 1}).join(str).slice(0, len) } /* * Pad `str` up to total length `max` with `chr`. * If `str` is longer than `max`, padRight will return `str` unaltered. * * @param String str string to pad * @param Number max total length of output string * @param String chr optional. Character to pad with. default: ' ' * @return String padded str / function padRight(str, max, chr) { str = str != null ? str : '' str = String(str) var length = max - wcwidth(str) if (length <= 0) return str return str + repeatString(chr \|\| ' ', length) } /* * Pad `str` up to total length `max` with `chr`. * If `str` is longer than `max`, padCenter will return `str` unaltered. * * @param String str string to pad * @param Number max total length of output string * @param String chr optional. Character to pad with. default: ' ' * @return String padded str / function padCenter(str, max, chr) { str = str != null ? str : '' str = String(str) var length = max - wcwidth(str) if (length <= 0) return str var lengthLeft = Math.floor(length/2) var lengthRight = length - lengthLeft return repeatString(chr \|\| ' ', lengthLeft) + str + repeatString(chr \|\| ' ', lengthRight) } /* * Pad `str` up to total length `max` with `chr`, on the left. * If `str` is longer than `max`, padRight will return `str` unaltered. * * @param String str string to pad * @param Number max total length of output string * @param String chr optional. Character to pad with. default: ' ' * @return String padded str / function padLeft(str, max, chr) { str = str != null ? str : '' str = String(str) var length = max - wcwidth(str) if (length <= 0) return str return repeatString(chr \|\| ' ', length) + str } /* * Split a String `str` into lines of maxiumum length `max`. * Splits on word boundaries. Preserves existing new lines. * * @param String str string to split * @param Number max length of each line * @return Array Array containing lines. / function splitIntoLines(str, max) { function _splitIntoLines(str, max) { return str.trim().split(' ').reduce(function(lines, word) { var line = lines[lines.length - 1] if (line && wcwidth(line.join(' ')) + wcwidth(word) < max) { lines[lines.length - 1].push(word) // add to line } else lines.push([word]) // new line return lines }, []).map(function(l) { return l.join(' ') }) } return str.split('\n').map(function(str) { return _splitIntoLines(str, max) }).reduce(function(lines, line) { return lines.concat(line) }, []) } /* * Add spaces and `truncationChar` between words of * `str` which are longer than `max`. * * @param String str string to split * @param Number max length of each line * @param Number truncationChar character to append to split words * @return String / function splitLongWords(str, max, truncationChar) { str = str.trim() var result = [] var words = str.split(' ') var remainder = '' var truncationWidth = wcwidth(truncationChar) while (remainder \|\| words.length) { if (remainder) { var word = remainder remainder = '' } else { var word = words.shift() } if (wcwidth(word) > max) { // slice is based on length no wcwidth var i = 0 var wwidth = 0 var limit = max - truncationWidth while (i < word.length) { var w = wcwidth(word.charAt(i)) if (w + wwidth > limit) { break } wwidth += w ++i } remainder = word.slice(i) // get remainder // save remainder for next loop word = word.slice(0, i) // grab truncated word word += truncationChar // add trailing … or whatever } result.push(word) } return result.join(' ') } /* * Truncate `str` into total width `max` * If `str` is shorter than `max`, will return `str` unaltered. * * @param String str string to truncated * @param Number max total wcwidth of output string * @return String truncated str / function truncateString(str, max) { str = str != null ? str : '' str = String(str) if(max == Infinity) return str var i = 0 var wwidth = 0 while (i < str.length) { var w = wcwidth(str.charAt(i)) if(w + wwidth > max) break wwidth += w ++i } return str.slice(0, i) } /* * Exports */ module.exports.padRight = padRight module.exports.padCenter = padCenter module.exports.padLeft = padLeft module.exports.splitIntoLines = splitIntoLines module.exports.splitLongWords = splitLongWords module.exports.truncateString = truncateString Back

Edit File : utils.js | Size : 4.75 KB

"use strict"

var wcwidth = require('./width')

/**
 * repeat string `str` up to total length of `len`
 *
 * @param String str string to repeat
 * @param Number len total length of output string
 */

function repeatString(str, len) {
  return Array.apply(null, {length: len + 1}).join(str).slice(0, len)
}

/**
 * Pad `str` up to total length `max` with `chr`.
 * If `str` is longer than `max`, padRight will return `str` unaltered.
 *
 * @param String str string to pad
 * @param Number max total length of output string
 * @param String chr optional. Character to pad with. default: ' '
 * @return String padded str
 */

function padRight(str, max, chr) {
  str = str != null ? str : ''
  str = String(str)
  var length = max - wcwidth(str)
  if (length <= 0) return str
  return str + repeatString(chr || ' ', length)
}

/**
 * Pad `str` up to total length `max` with `chr`.
 * If `str` is longer than `max`, padCenter will return `str` unaltered.
 *
 * @param String str string to pad
 * @param Number max total length of output string
 * @param String chr optional. Character to pad with. default: ' '
 * @return String padded str
 */

function padCenter(str, max, chr) {
  str = str != null ? str : ''
  str = String(str)
  var length = max - wcwidth(str)
  if (length <= 0) return str
  var lengthLeft = Math.floor(length/2)
  var lengthRight = length - lengthLeft
  return repeatString(chr || ' ', lengthLeft) + str + repeatString(chr || ' ', lengthRight)
}

/**
 * Pad `str` up to total length `max` with `chr`, on the left.
 * If `str` is longer than `max`, padRight will return `str` unaltered.
 *
 * @param String str string to pad
 * @param Number max total length of output string
 * @param String chr optional. Character to pad with. default: ' '
 * @return String padded str
 */

function padLeft(str, max, chr) {
  str = str != null ? str : ''
  str = String(str)
  var length = max - wcwidth(str)
  if (length <= 0) return str
  return repeatString(chr || ' ', length) + str
}

/**
 * Split a String `str` into lines of maxiumum length `max`.
 * Splits on word boundaries. Preserves existing new lines.
 *
 * @param String str string to split
 * @param Number max length of each line
 * @return Array Array containing lines.
 */

function splitIntoLines(str, max) {
  function _splitIntoLines(str, max) {
    return str.trim().split(' ').reduce(function(lines, word) {
      var line = lines[lines.length - 1]
      if (line && wcwidth(line.join(' ')) + wcwidth(word) < max) {
        lines[lines.length - 1].push(word) // add to line
      }
      else lines.push([word]) // new line
      return lines
    }, []).map(function(l) {
      return l.join(' ')
    })
  }
  return str.split('\n').map(function(str) {
    return _splitIntoLines(str, max)
  }).reduce(function(lines, line) {
    return lines.concat(line)
  }, [])
}

/**
 * Add spaces and `truncationChar` between words of
 * `str` which are longer than `max`.
 *
 * @param String str string to split
 * @param Number max length of each line
 * @param Number truncationChar character to append to split words
 * @return String
 */

function splitLongWords(str, max, truncationChar) {
  str = str.trim()
  var result = []
  var words = str.split(' ')
  var remainder = ''

var truncationWidth = wcwidth(truncationChar)

while (remainder || words.length) {
    if (remainder) {
      var word = remainder
      remainder = ''
    } else {
      var word = words.shift()
    }

if (wcwidth(word) > max) {
      // slice is based on length no wcwidth
      var i = 0
      var wwidth = 0
      var limit = max - truncationWidth
      while (i < word.length) {
        var w = wcwidth(word.charAt(i))
        if (w + wwidth > limit) {
          break
        }
        wwidth += w
        ++i
      }

remainder = word.slice(i) // get remainder
      // save remainder for next loop

word = word.slice(0, i) // grab truncated word
      word += truncationChar // add trailing … or whatever
    }
    result.push(word)
  }

return result.join(' ')
}

/**
 * Truncate `str` into total width `max`
 * If `str` is shorter than `max`,  will return `str` unaltered.
 *
 * @param String str string to truncated
 * @param Number max total wcwidth of output string
 * @return String truncated str
 */

function truncateString(str, max) {

str = str != null ? str : ''
  str = String(str)

if(max == Infinity) return str

var i = 0
  var wwidth = 0
  while (i < str.length) {
    var w = wcwidth(str.charAt(i))
    if(w + wwidth > max)
      break
    wwidth += w
    ++i
  }
  return str.slice(0, i)
}

/**
 * Exports
 */

module.exports.padRight = padRight
module.exports.padCenter = padCenter
module.exports.padLeft = padLeft
module.exports.splitIntoLines = splitIntoLines
module.exports.splitLongWords = splitLongWords
module.exports.truncateString = truncateString

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