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Filename :
utils.js
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"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