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'use strict';
var token = '%[a-f0-9]{2}';
var singleMatcher = new RegExp(token, 'gi');
var multiMatcher = new RegExp('(' + token + ')+', 'gi');
function decodeComponents(components, split) {
try {
// Try to decode the entire string first
return decodeURIComponent(components.join(''));
} catch (err) {
// Do nothing
}
if (components.length === 1) {
return components;
}
split = split || 1;
// Split the array in 2 parts
var left = components.slice(0, split);
var right = components.slice(split);
return Array.prototype.concat.call([], decodeComponents(left), decodeComponents(right));
}
function decode(input) {
try {
return decodeURIComponent(input);
} catch (err) {
var tokens = input.match(singleMatcher);
for (var i = 1; i < tokens.length; i++) {
input = decodeComponents(tokens, i).join('');
tokens = input.match(singleMatcher);
}
return input;
}
}
function customDecodeURIComponent(input) {
// Keep track of all the replacements and prefill the map with the `BOM`
var replaceMap = {
'%FE%FF': '\uFFFD\uFFFD',
'%FF%FE': '\uFFFD\uFFFD'
};
var match = multiMatcher.exec(input);
while (match) {
try {
// Decode as big chunks as possible
replaceMap[match[0]] = decodeURIComponent(match[0]);
} catch (err) {
var result = decode(match[0]);
if (result !== match[0]) {
replaceMap[match[0]] = result;
}
}
match = multiMatcher.exec(input);
}
// Add `%C2` at the end of the map to make sure it does not replace the combinator before everything else
replaceMap['%C2'] = '\uFFFD';
var entries = Object.keys(replaceMap);
for (var i = 0; i < entries.length; i++) {
// Replace all decoded components
var key = entries[i];
input = input.replace(new RegExp(key, 'g'), replaceMap[key]);
}
return input;
}
module.exports = function (encodedURI) {
if (typeof encodedURI !== 'string') {
throw new TypeError('Expected `encodedURI` to be of type `string`, got `' + typeof encodedURI + '`');
}
try {
encodedURI = encodedURI.replace(/\+/g, ' ');
// Try the built in decoder first
return decodeURIComponent(encodedURI);
} catch (err) {
// Fallback to a more advanced decoder
return customDecodeURIComponent(encodedURI);
}
};
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