99 lines
2.2 KiB
JavaScript
99 lines
2.2 KiB
JavaScript
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'use strict';
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var 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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var i, ch, cache = encodeCache[exclude];
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if (cache) { return cache; }
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cache = encodeCache[exclude] = [];
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for (i = 0; i < 128; i++) {
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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 (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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var i, l, code, nextCode, cache,
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result = '';
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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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cache = getEncodeCache(exclude);
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for (i = 0, l = string.length; i < l; i++) {
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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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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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module.exports = encode;
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