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