99 lines
2.2 KiB
JavaScript
99 lines
2.2 KiB
JavaScript
|
|
'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;
|