90 lines
2.2 KiB
JavaScript
90 lines
2.2 KiB
JavaScript
const encodeCache = {}
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// Create a lookup array where anything but characters in `chars` string
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// and alphanumeric chars is percent-encoded.
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//
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function getEncodeCache (exclude) {
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let cache = encodeCache[exclude]
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if (cache) { return cache }
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cache = encodeCache[exclude] = []
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for (let i = 0; i < 128; i++) {
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const ch = String.fromCharCode(i)
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if (/^[0-9a-z]$/i.test(ch)) {
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// always allow unencoded alphanumeric characters
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cache.push(ch)
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} else {
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cache.push('%' + ('0' + i.toString(16).toUpperCase()).slice(-2))
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}
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}
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for (let i = 0; i < exclude.length; i++) {
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cache[exclude.charCodeAt(i)] = exclude[i]
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}
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return cache
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}
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// Encode unsafe characters with percent-encoding, skipping already
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// encoded sequences.
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//
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// - string - string to encode
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// - exclude - list of characters to ignore (in addition to a-zA-Z0-9)
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// - keepEscaped - don't encode '%' in a correct escape sequence (default: true)
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//
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function encode (string, exclude, keepEscaped) {
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if (typeof exclude !== 'string') {
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// encode(string, keepEscaped)
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keepEscaped = exclude
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exclude = encode.defaultChars
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}
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if (typeof keepEscaped === 'undefined') {
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keepEscaped = true
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}
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const cache = getEncodeCache(exclude)
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let result = ''
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for (let i = 0, l = string.length; i < l; i++) {
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const code = string.charCodeAt(i)
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if (keepEscaped && code === 0x25 /* % */ && i + 2 < l) {
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if (/^[0-9a-f]{2}$/i.test(string.slice(i + 1, i + 3))) {
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result += string.slice(i, i + 3)
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i += 2
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continue
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}
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}
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if (code < 128) {
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result += cache[code]
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continue
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}
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if (code >= 0xD800 && code <= 0xDFFF) {
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if (code >= 0xD800 && code <= 0xDBFF && i + 1 < l) {
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const nextCode = string.charCodeAt(i + 1)
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if (nextCode >= 0xDC00 && nextCode <= 0xDFFF) {
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result += encodeURIComponent(string[i] + string[i + 1])
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i++
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continue
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}
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}
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result += '%EF%BF%BD'
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continue
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}
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result += encodeURIComponent(string[i])
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}
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return result
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}
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encode.defaultChars = ";/?:@&=+$,-_.!~*'()#"
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encode.componentChars = "-_.!~*'()"
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export default encode
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