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cipher.js
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cipher.js
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// short hand for logging
const log = (txt) => { console.log(txt); };
// some field accessors
const secretInput = document.getElementById('secret');
const bookInput = document.getElementById('book');
// getters/setters for en-/decode fields
const getDecoded = () => {
if (document.getElementById('decoded')) {
return document.getElementById('decoded').innerHTML;
} else {
return '';
}
};
const setDecoded = (val) => {
document.getElementById('decoded').innerHTML = val;
log('Setting decode to ' + val + '.');
};
const getEncoded = () => {
if (document.getElementById('encoded')) {
return document.getElementById('encoded').innerHTML;
} else {
return '';
}
};
const setEncoded = (val) => {
document.getElementById('encoded').innerHTML = val;
log('Setting encode to ' + val + '.');
};
// helper functions
const valueFromEvent = (event) => { return event.target.value };
const allowedCharacters = (character) => { return '. '.indexOf(character) === -1; };
// element to observable
const observableElement = (element) => {
return Rx.Observable.fromEvent(element, 'input')
.map(valueFromEvent)
.debounce(150);
};
// inputs as observables:
const secret$ = observableElement(secretInput);
const book$ = observableElement(bookInput);
// current encode/decode maps
var encodeMap;
var decodeMap;
// the encodeMap has type Character => [Number]
var createEncodeMap = (text) => {
var buildEncodeMap = (map, character, idx) => {
var cipher = [idx];
if (map.has(character)) {
cipher = cipher.concat(map.get(character));
}
return map.set(character.toLowerCase(), cipher);
};
Rx.Observable
.from(text)
.where(allowedCharacters)
.reduce(buildEncodeMap, new Map())
.subscribe((map) => { encodeMap = map });
};
// the decodeMap has type Number => Character
var createDecodeMap = (text) => {
var buildDecodeMap = (map, character, idx) => { return map.set(idx, character) };
Rx.Observable
.from(text)
.where(allowedCharacters)
.reduce(buildDecodeMap, new Map())
.subscribe(it => { decodeMap = it });
};
var encode = (text, map) => {
if (!text) {
log('No text to encode, resultung to default.');
text = secretInput.value;
}
if (!map) {
log('No map to encode, resorting to default.');
map = encodeMap;
}
var safeEncodeCharacter = (character, map) => {
var key = character.toLowerCase();
if (map.has(key)) {
var list = map.get(key);
var idx = Math.round(Math.random() * (list.length - 1));
return list[idx];
} else {
return character;
}
};
var result;
Rx.Observable
.from(text)
.map(c => safeEncodeCharacter(c, encodeMap))
.reduce((string, cipher) => { return string + ' ' + cipher; }, '')
.subscribe(code => {
setEncoded(code);
result = code;
});
return result;
};
var decode = (code, map) => {
if (!code) {
log('No code to decode, resorting to default.');
code = getEncoded();
}
if (!map) {
log('No map to decode, resorting to default.');
map = decodeMap;
}
const safeDecodeCipher = (cipher, decodeMap) => {
var key = parseInt(cipher);
if (decodeMap.has(key)) {
log(key + ' ' + decodeMap.get(key));
return decodeMap.get(key);
} else {
return cipher;
}
};
//var result;
var ciphers = code.split(' ');
Rx.Observable
.from(ciphers)
.filter((cipher) => { return cipher !== '' })
.map((cipher) => safeDecodeCipher(cipher, map))
.reduce((string, character) => { return string + character; }, '')
.subscribe(decodedString => { setDecoded(decodedString); });
};
var createMaps = (txt) => {
var book = txt;
if (!txt) {
book = bookInput.value;
}
createEncodeMap(book);
createDecodeMap(book);
};
// 0.0 couple encoding to observable secret/book
var watchSecret = function () {
secret$.subscribe((txt) => {
encode(txt, encodeMap);
decode(document.getElementById('encoded').innerHTML, decodeMap);
});
};
// 0.0 couple decoding to observable encoding
var watchBook = function () {
book$.subscribe((book) => { createMaps(book); });
};
(function () {
createMaps();
encode();
decode();
book$.subscribe((book) => { createMaps(book); });
secret$.subscribe((txt) => {
encode(txt, encodeMap);
decode(document.getElementById('encoded').innerHTML, decodeMap);
});
})();
// do something with instead of spaces.