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Switch from ES6 to ES5 to ensure compatability. #4

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Switch from ES6 to ES5 to ensure compatability. #4

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50 changes: 25 additions & 25 deletions index.js
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Original file line number Diff line number Diff line change
@@ -1,25 +1,25 @@
'use strict'

const HIGH_SURROGATE_START = 0xd800
const HIGH_SURROGATE_END = 0xdbff
var HIGH_SURROGATE_START = 0xd800
var HIGH_SURROGATE_END = 0xdbff

const LOW_SURROGATE_START = 0xdc00
var LOW_SURROGATE_START = 0xdc00

const REGIONAL_INDICATOR_START = 0x1f1e6
const REGIONAL_INDICATOR_END = 0x1f1ff
var REGIONAL_INDICATOR_START = 0x1f1e6
var REGIONAL_INDICATOR_END = 0x1f1ff

const FITZPATRICK_MODIFIER_START = 0x1f3fb
const FITZPATRICK_MODIFIER_END = 0x1f3ff
var FITZPATRICK_MODIFIER_START = 0x1f3fb
var FITZPATRICK_MODIFIER_END = 0x1f3ff

const VARIATION_MODIFIER_START = 0xfe00
const VARIATION_MODIFIER_END = 0xfe0f
var VARIATION_MODIFIER_START = 0xfe00
var VARIATION_MODIFIER_END = 0xfe0f

const DIACRITICAL_MARKS_START = 0x20d0
const DIACRITICAL_MARKS_END = 0x20ff
var DIACRITICAL_MARKS_START = 0x20d0
var DIACRITICAL_MARKS_END = 0x20ff

const ZWJ = 0x200d
var ZWJ = 0x200d

const GRAPHEMS = [
var GRAPHEMS = [
0x0308, // ( ◌̈ ) COMBINING DIAERESIS
0x0937, // ( ष ) DEVANAGARI LETTER SSA
0x0937, // ( ष ) DEVANAGARI LETTER SSA
Expand All @@ -41,9 +41,9 @@ function runes (string) {
if (typeof string !== 'string') {
throw new Error('string cannot be undefined or null')
}
const result = []
let i = 0
let increment = 0
var result = []
var i = 0
var increment = 0
while (i < string.length) {
increment += nextUnits(i + increment, string)
if (isGraphem(string[i + increment])) {
Expand Down Expand Up @@ -73,15 +73,15 @@ function runes (string) {
// Country flags: 4 code units (2 code points)
// Variations: 2 code units
function nextUnits (i, string) {
const current = string[i]
var current = string[i]
// If we don't have a value that is part of a surrogate pair, or we're at
// the end, only take the value at i
if (!isFirstOfSurrogatePair(current) || i === string.length - 1) {
return 1
}

const currentPair = current + string[i + 1]
let nextPair = string.substring(i + 2, i + 5)
var currentPair = current + string[i + 1]
var nextPair = string.substring(i + 2, i + 5)

// Country flags are comprised of two regional indicator symbols,
// each represented by a surrogate pair.
Expand Down Expand Up @@ -133,8 +133,8 @@ function isZeroWidthJoiner (string) {
}

function codePointFromSurrogatePair (pair) {
const highOffset = pair.charCodeAt(0) - HIGH_SURROGATE_START
const lowOffset = pair.charCodeAt(1) - LOW_SURROGATE_START
var highOffset = pair.charCodeAt(0) - HIGH_SURROGATE_START
var lowOffset = pair.charCodeAt(1) - LOW_SURROGATE_START
return (highOffset << 10) + lowOffset + 0x10000
}

Expand All @@ -143,16 +143,16 @@ function betweenInclusive (value, lower, upper) {
}

function substring (string, start, width) {
const chars = runes(string)
var chars = runes(string)
if (start === undefined) {
return string
}
if (start >= chars.length) {
return ''
}
const rest = chars.length - start
const stringWidth = width === undefined ? rest : width
let endIndex = start + stringWidth
var rest = chars.length - start
var stringWidth = width === undefined ? rest : width
var endIndex = start + stringWidth
if (endIndex > (start + rest)) {
endIndex = undefined
}
Expand Down