39 lines
805 B
JavaScript
39 lines
805 B
JavaScript
|
'use strict'
|
||
|
|
|
||
|
|
module.exports = function (str) {
|
||
|
|
var offset = 0
|
||
|
|
str = str.toString()
|
||
|
|
|
||
|
|
return iterator
|
||
|
|
|
||
|
|
function iterator () {
|
||
|
|
var i1 = str.indexOf('\r\n', offset)
|
||
|
|
var i2 = str.indexOf('\n', offset)
|
||
|
|
var i3 = str.indexOf('\r', offset)
|
||
|
|
|
||
|
|
var indexes = [i1, i2, i3]
|
||
|
|
var index = indexes
|
||
|
|
.sort(function (a, b) {
|
||
|
|
if (a > b) return 1
|
||
|
|
if (a < b) return -1
|
||
|
|
return 0
|
||
|
|
})
|
||
|
|
.filter(function (index) {
|
||
|
|
return index !== -1
|
||
|
|
})[0]
|
||
|
|
|
||
|
|
if (index !== undefined) return extract(index, index === i1 ? 2 : 1)
|
||
|
|
|
||
|
|
var length = str.length
|
||
|
|
if (length === offset) return null
|
||
|
|
|
||
|
|
return extract(length, 0)
|
||
|
|
}
|
||
|
|
|
||
|
|
function extract (index, skip) {
|
||
|
|
var line = str.substr(offset, index - offset)
|
||
|
|
offset = index + skip
|
||
|
|
return line
|
||
|
|
}
|
||
|
|
}
|