Hugging Face's logo

chainr-ai
/
CHAINR

English
web3
blockchain
dapp
smart-contracts
ethereum
solidity
defi
nft
ai-assistant
Model card Files
xet
 Community
CHAINR / backend /node_modules /@sideway /address /lib /decode.js
chainr-ai's picture
chainr-ai
Upload 8536 files
4888678 verified
Raw History Blame Contribute Delete
3.81 kB
'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
]
};