121 lines
3.7 KiB
JavaScript
Executable file
121 lines
3.7 KiB
JavaScript
Executable file
'use strict';
|
|
|
|
// Adapted from:
|
|
// Copyright (c) 2017-2019 Justin Ridgewell, MIT Licensed, https://github.com/jridgewell/safe-decode-string-component
|
|
// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>, MIT Licensed, http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
|
|
|
|
|
|
const internals = {};
|
|
|
|
|
|
exports.decode = function (string) {
|
|
|
|
let percentPos = string.indexOf('%');
|
|
if (percentPos === -1) {
|
|
return string;
|
|
}
|
|
|
|
let decoded = '';
|
|
let last = 0;
|
|
let codepoint = 0;
|
|
let startOfOctets = percentPos;
|
|
let state = internals.utf8.accept;
|
|
|
|
while (percentPos > -1 &&
|
|
percentPos < string.length) {
|
|
|
|
const high = internals.resolveHex(string[percentPos + 1], 4);
|
|
const low = internals.resolveHex(string[percentPos + 2], 0);
|
|
const byte = high | low;
|
|
const type = internals.utf8.data[byte];
|
|
state = internals.utf8.data[256 + state + type];
|
|
codepoint = (codepoint << 6) | (byte & internals.utf8.data[364 + type]);
|
|
|
|
if (state === internals.utf8.accept) {
|
|
decoded += string.slice(last, startOfOctets);
|
|
decoded += codepoint <= 0xFFFF
|
|
? String.fromCharCode(codepoint)
|
|
: String.fromCharCode(0xD7C0 + (codepoint >> 10), 0xDC00 + (codepoint & 0x3FF));
|
|
|
|
codepoint = 0;
|
|
last = percentPos + 3;
|
|
percentPos = string.indexOf('%', last);
|
|
startOfOctets = percentPos;
|
|
continue;
|
|
}
|
|
|
|
if (state === internals.utf8.reject) {
|
|
return null;
|
|
}
|
|
|
|
percentPos += 3;
|
|
|
|
if (percentPos >= string.length ||
|
|
string[percentPos] !== '%') {
|
|
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return decoded + string.slice(last);
|
|
};
|
|
|
|
|
|
internals.resolveHex = function (char, shift) {
|
|
|
|
const i = internals.hex[char];
|
|
return i === undefined ? 255 : i << shift;
|
|
};
|
|
|
|
|
|
internals.hex = {
|
|
'0': 0, '1': 1, '2': 2, '3': 3, '4': 4,
|
|
'5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
|
|
'a': 10, 'A': 10, 'b': 11, 'B': 11, 'c': 12,
|
|
'C': 12, 'd': 13, 'D': 13, 'e': 14, 'E': 14,
|
|
'f': 15, 'F': 15
|
|
};
|
|
|
|
|
|
internals.utf8 = {
|
|
accept: 12,
|
|
reject: 0,
|
|
data: [
|
|
|
|
// Maps bytes to character to a transition
|
|
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
|
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
|
|
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
|
|
4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
|
|
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
|
|
6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 7, 7,
|
|
10, 9, 9, 9, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
|
|
|
|
// Maps a state to a new state when adding a transition
|
|
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
12, 0, 0, 0, 0, 24, 36, 48, 60, 72, 84, 96,
|
|
0, 12, 12, 12, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 24, 24, 24, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 24, 24, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 48, 48, 48, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 48, 48, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 48, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
|
|
// Maps the current transition to a mask that needs to apply to the byte
|
|
|
|
0x7F, 0x3F, 0x3F, 0x3F, 0x00, 0x1F, 0x0F, 0x0F, 0x0F, 0x07, 0x07, 0x07
|
|
]
|
|
};
|