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69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
export default normalizeUri
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import asciiAlphanumeric from '../character/ascii-alphanumeric.mjs'
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import codes from '../character/codes.mjs'
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import values from '../character/values.mjs'
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import fromCharCode from '../constant/from-char-code.mjs'
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// Encode unsafe characters with percent-encoding, skipping already
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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)
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// A correct percent encoded value.
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if (
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code === codes.percentSign &&
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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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}
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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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}
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// Astral.
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else if (code > 55295 && code < 57344) {
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next = value.charCodeAt(index + 1)
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// 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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}
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// Lone surrogate.
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else {
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replace = values.replacementCharacter
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}
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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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