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export default normalizeUri
import asciiAlphanumeric from '../character/ascii-alphanumeric.mjs'
import codes from '../character/codes.mjs'
import values from '../character/values.mjs'
import fromCharCode from '../constant/from-char-code.mjs'
// Encode unsafe characters with percent-encoding, skipping already
// encoded sequences.
function normalizeUri(value) {
var index = -1
var result = []
var start = 0
var skip = 0
var code
var next
var replace
while (++index < value.length) {
code = value.charCodeAt(index)
// A correct percent encoded value.
if (
code === codes.percentSign &&
asciiAlphanumeric(value.charCodeAt(index + 1)) &&
asciiAlphanumeric(value.charCodeAt(index + 2))
) {
skip = 2
}
// ASCII.
else if (code < 128) {
if (!/[!#$&-;=?-Z_a-z~]/.test(fromCharCode(code))) {
replace = fromCharCode(code)
}
}
// Astral.
else if (code > 55295 && code < 57344) {
next = value.charCodeAt(index + 1)
// A correct surrogate pair.
if (code < 56320 && next > 56319 && next < 57344) {
replace = fromCharCode(code, next)
skip = 1
}
// Lone surrogate.
else {
replace = values.replacementCharacter
}
}
// Unicode.
else {
replace = fromCharCode(code)
}
if (replace) {
result.push(value.slice(start, index), encodeURIComponent(replace))
start = index + skip + 1
replace = undefined
}
if (skip) {
index += skip
skip = 0
}
}
return result.join('') + value.slice(start)
}
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