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98 lines
2.2 KiB
98 lines
2.2 KiB
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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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