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"use strict";
const ansiEscapeCode = '[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-PRZcf-nqry=><]'
, zeroWidthCharacterExceptNewline = '\u0000-\u0008\u000B-\u0019\u001b\u009b\u00ad\u200b\u2028\u2029\ufeff\ufe00-\ufe0f'
, zeroWidthCharacter = '\n' + zeroWidthCharacterExceptNewline
, zeroWidthCharactersExceptNewline = new RegExp ('(?:' + ansiEscapeCode + ')|[' + zeroWidthCharacterExceptNewline + ']', 'g')
, zeroWidthCharacters = new RegExp ('(?:' + ansiEscapeCode + ')|[' + zeroWidthCharacter + ']', 'g')
, partition = new RegExp ('((?:' + ansiEscapeCode + ')|[\t' + zeroWidthCharacter + '])?([^\t' + zeroWidthCharacter + ']*)', 'g')
module.exports = {
zeroWidthCharacters,
ansiEscapeCodes: new RegExp (ansiEscapeCode, 'g'),
strlen: s => Array.from (s.replace (zeroWidthCharacters, '')).length, // Array.from solves the emoji problem as described here: http://blog.jonnew.com/posts/poo-dot-length-equals-two
isBlank: s => s.replace (zeroWidthCharacters, '')
.replace (/\s/g, '')
.length === 0,
blank: s => Array.from (s.replace (zeroWidthCharactersExceptNewline, '')) // Array.from solves the emoji problem as described here: http://blog.jonnew.com/posts/poo-dot-length-equals-two
.map (x => ((x === '\t') || (x === '\n')) ? x : ' ')
.join (''),
partition (s) {
for (var m, spans = []; (partition.lastIndex !== s.length) && (m = partition.exec (s));) { spans.push ([m[1] || '', m[2]]) }
partition.lastIndex = 0 // reset
return spans
},
first (s, n) {
let result = '', length = 0
for (const [nonPrintable, printable] of module.exports.partition (s)) {
const text = Array.from (printable).slice (0, n - length) // Array.from solves the emoji problem as described here: http://blog.jonnew.com/posts/poo-dot-length-equals-two
result += nonPrintable + text.join ('')
length += text.length
}
return result
}
}
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