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Tue, Nov 19, 11:15

index.js
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const os = require('os')
const t = require('typical')
/**
* @module wordwrapjs
*/
const re = {
chunk: /[^\s-]+?-\b|\S+|\s+|\r\n?|\n/g,
ansiEscapeSequence: /\u001b.*?m/g
}
/**
* @alias module:wordwrapjs
* @typicalname wordwrap
*/
class WordWrap {
constructor (text, options) {
options = options || {}
if (!t.isDefined(text)) text = ''
this._lines = String(text).split(/\r\n|\n/g)
this.options = options
this.options.width = options.width === undefined ? 30 : options.width
}
lines () {
const flatten = require('reduce-flatten')
/* trim each line of the supplied text */
return this._lines.map(trimLine.bind(this))
/* split each line into an array of chunks, else mark it empty */
.map(line => line.match(re.chunk) || [ '~~empty~~' ])
/* optionally, break each word on the line into pieces */
.map(lineWords => {
if (this.options.break) {
return lineWords.map(breakWord.bind(this))
} else {
return lineWords
}
})
.map(lineWords => lineWords.reduce(flatten, []))
/* transforming the line of words to one or more new lines wrapped to size */
.map(lineWords => {
return lineWords
.reduce((lines, word) => {
let currentLine = lines[lines.length - 1]
if (replaceAnsi(word).length + replaceAnsi(currentLine).length > this.options.width) {
lines.push(word)
} else {
lines[lines.length - 1] += word
}
return lines
}, [ '' ])
})
.reduce(flatten, [])
/* trim the wrapped lines */
.map(trimLine.bind(this))
/* filter out empty lines */
.filter(line => line.trim())
/* restore the user's original empty lines */
.map(line => line.replace('~~empty~~', ''))
}
wrap () {
return this.lines().join(os.EOL)
}
toString () {
return this.wrap()
}
/**
* @param {string} - the input text to wrap
* @param [options] {object} - optional configuration
* @param [options.width] {number} - the max column width in characters (defaults to 30).
* @param [options.break] {boolean} - if true, words exceeding the specified `width` will be forcefully broken
* @param [options.noTrim] {boolean} - By default, each line output is trimmed. If `noTrim` is set, no line-trimming occurs - all whitespace from the input text is left in.
* @return {string}
*/
static wrap (text, options) {
const block = new this(text, options)
return block.wrap()
}
/**
* Wraps the input text, returning an array of strings (lines).
* @param {string} - input text
* @param {object} - Accepts same options as constructor.
*/
static lines (text, options) {
const block = new this(text, options)
return block.lines()
}
/**
* Returns true if the input text would be wrapped if passed into `.wrap()`.
* @param {string} - input text
* @return {boolean}
*/
static isWrappable (text) {
if (t.isDefined(text)) {
text = String(text)
var matches = text.match(re.chunk)
return matches ? matches.length > 1 : false
}
}
/**
* Splits the input text into an array of words and whitespace.
* @param {string} - input text
* @returns {string[]}
*/
static getChunks (text) {
return text.match(re.chunk) || []
}
}
function trimLine (line) {
return this.options.noTrim ? line : line.trim()
}
function replaceAnsi (string) {
return string.replace(re.ansiEscapeSequence, '')
}
/* break a word into several pieces */
function breakWord (word) {
if (replaceAnsi(word).length > this.options.width) {
const letters = word.split('')
let piece
const pieces = []
while ((piece = letters.splice(0, this.options.width)).length) {
pieces.push(piece.join(''))
}
return pieces
} else {
return word
}
}
module.exports = WordWrap

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