sgauthier
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63 lines
1.4 KiB
JavaScript
63 lines
1.4 KiB
JavaScript
'use strict'
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var asciiAlphanumeric = require('../character/ascii-alphanumeric.js')
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var fromCharCode = require('../constant/from-char-code.js')
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// encoded sequences.
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function normalizeUri(value) {
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var index = -1
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var result = []
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var start = 0
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var skip = 0
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var code
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var next
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var replace
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while (++index < value.length) {
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code = value.charCodeAt(index) // A correct percent encoded value.
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if (
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code === 37 &&
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asciiAlphanumeric(value.charCodeAt(index + 1)) &&
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asciiAlphanumeric(value.charCodeAt(index + 2))
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) {
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skip = 2
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} // ASCII.
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else if (code < 128) {
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if (!/[!#$&-;=?-Z_a-z~]/.test(fromCharCode(code))) {
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replace = fromCharCode(code)
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}
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} // Astral.
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else if (code > 55295 && code < 57344) {
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next = value.charCodeAt(index + 1) // A correct surrogate pair.
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if (code < 56320 && next > 56319 && next < 57344) {
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replace = fromCharCode(code, next)
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skip = 1
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} // Lone surrogate.
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else {
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replace = '\uFFFD'
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}
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} // Unicode.
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else {
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replace = fromCharCode(code)
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}
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if (replace) {
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result.push(value.slice(start, index), encodeURIComponent(replace))
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start = index + skip + 1
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replace = undefined
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}
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if (skip) {
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index += skip
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skip = 0
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}
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}
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return result.join('') + value.slice(start)
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}
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module.exports = normalizeUri
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