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'use strict'
const RE_PLUS = /\+/g
const HEX = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
]
function Decoder () {
this.buffer = undefined
}
Decoder.prototype.write = function (str) {
// Replace '+' with ' ' before decoding
str = str.replace(RE_PLUS, ' ')
let res = ''
let i = 0; let p = 0; const len = str.length
for (; i < len; ++i) {
if (this.buffer !== undefined) {
if (!HEX[str.charCodeAt(i)]) {
res += '%' + this.buffer
this.buffer = undefined
--i // retry character
} else {
this.buffer += str[i]
++p
if (this.buffer.length === 2) {
res += String.fromCharCode(parseInt(this.buffer, 16))
this.buffer = undefined
}
}
} else if (str[i] === '%') {
if (i > p) {
res += str.substring(p, i)
p = i
}
this.buffer = ''
++p
}
}
if (p < len && this.buffer === undefined) { res += str.substring(p) }
return res
}
Decoder.prototype.reset = function () {
this.buffer = undefined
}
module.exports = Decoder
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