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Release ZWUS-7 as the default encoding

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multipleof4
2026-09-16 16:50:55 -07:00
parent adc877d743
commit 5ede2507d7
3 changed files with 23 additions and 14 deletions
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index.js
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@@ -4,37 +4,44 @@
const zwus = {
3: {unifier: "\u{00AD}", 0: "\u{180E}", 1: "\u{200B}", 2: "\u{200D}"},
6: {unifier: "\u{200C}", 0: "\u{200D}", 1: "\u{200F}", 2: "\u{00AD}", 3: "\u{2060}", 4: "\u{200B}", 5: "\u{200E}"},
8: {unifier: "\u{200C}", 0: "\u{200D}", 1: "\u{200F}", 2: "\u{00AD}", 3: "\u{2060}", 4: "\u{200B}", 5: "\u{200E}", 6: "\u{180E}", 7: "\u{FEFF}"},
7: {unifier: "\u{200C}", 0: "\u{200D}", 1: "\u{200F}", 2: "\u{00AD}", 3: "\u{2060}", 4: "\u{200B}", 5: "\u{200E}", 6: "\u{FEFF}"},
/**
* Encodes a string into a sequence of zero-width characters.
* @param {string} text - The input text to encode.
* @param {number} base - The numerical base for encoding. Defaults to 6. Options: 3, 6, 8. Larger the base, the smaller the output, but the more likely the zero width will be detectable by sight.
* @param {number} base - The numerical base for encoding. Defaults to 7. Options: 3, 6, 7.
* @returns {string} The encoded string.
*/
encodeString: (text, base = 6) => Array.from(text, u => u.codePointAt(0).toString(base).split('').map(x => zwus[base][x]).join('')).join(zwus[base].unifier),
encodeString: (text, base = 7) => Array.from(text, u => (+base === 7 ? rankOf(u) : u.codePointAt(0)).toString(base).split('').map(x => zwus[base][x]).join('')).join(zwus[base].unifier),
/**
* Encodes an array of numbers into a sequence of zero-width characters.
* @param {Array<number>} arr - The array of numbers to encode.
* @param {number} base - The numerical base for encoding. Defaults to 6. Options: 3, 6, 8. Larger the base, the smaller the output, but the more likely the zero width will be detectable by sight.
* @param {number} base - The numerical base for encoding. Defaults to 7. Options: 3, 6, 7.
* @returns {string} The encoded array.
*/
encodeNumberArray: (arr, base = 6) => arr.map(n => n.toString(base).split('').map(x => zwus[base][x]).join('')).join(zwus[base].unifier),
encodeNumberArray: (arr, base = 7) => arr.map(n => n.toString(base).split('').map(x => zwus[base][x]).join('')).join(zwus[base].unifier),
/**
* Decodes a string of zero-width characters back into the original string.
* NOTE: Decoding accuracy is contingent upon the original encoding base and alphabet.
* @param {string} text - The encoded text to decode.
* @param {number} base - The numerical base for decoding. Defaults to 6. Must match the base used for encoding.
* @param {number} base - The numerical base for decoding. Defaults to 7. Must match the base used for encoding.
* @returns {string} The decoded string.
*/
decodeToString: (text, base = 6) => text.split(zwus[base].unifier).map(x => String.fromCodePoint(parseInt(Array.from(x).map(z => Object.keys(zwus[base]).find(k => zwus[base][k] === z)).join(''), base))).join(''),
decodeToString: (text, base = 7) => zwus.decodeToNumberArray(text, base).map(n => String.fromCodePoint(+base === 7 ? pointOf(n) : n)).join(''),
/**
* Decodes a string of zero-width characters back into the original array of numbers.
* NOTE: Decoding accuracy is contingent upon the original encoding base and alphabet.
* @param {string} text - The encoded text to decode.
* @param {number} base - The numerical base for decoding. Defaults to 6. Must match the base used for encoding.
* @param {number} base - The numerical base for decoding. Defaults to 7. Must match the base used for encoding.
* @returns {Array<number>} The decoded array of numbers.
*/
decodeToNumberArray: (text, base = 6) => text.split(zwus[base].unifier).map(x => parseInt(Array.from(x).map(z => Object.keys(zwus[base]).find(k => zwus[base][k] === z)).join(''), base)),
decodeToNumberArray: (text, base = 7) => text.split(zwus[base].unifier).map(x => Array.from(x).map(z => Object.keys(zwus[base]).find(k => zwus[base][k] === z)).join('')).filter(Boolean).map(x => parseInt(x, base)),
};
// Printable ASCII gets short base-7 values; other code points keep their value.
const priority = "te aoinshrdlucmfwypvbgkjqxz.,!?'-:;()0123456789ETAOINSHRDLUCMFWYPVBGKJQXZ";
const order = [...new Set([...priority, ...Array.from({length: 95}, (_, i) => String.fromCharCode(i + 32))])];
const ranks = new Map(order.map((char, rank) => [char, rank]));
const rankOf = char => ranks.get(char) ?? (char.codePointAt(0) < 32 ? char.codePointAt(0) + 95 : char.codePointAt(0));
const pointOf = rank => rank < 95 ? order[rank].codePointAt(0) : rank < 127 ? rank - 95 : rank;
export default zwus;