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parse_dna.js
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parse_dna.js
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// Imports a JSON object with a listing of parts,
// including a count of their appearances.
//
// The definitions object this format:
// {
// mouths: {
// <part string>: {
// count: <number>,
// tags: [ <tag stings> ]
// },
//
// ...
// },
//
// eyes: { ... },
//
// ...
// }
import definitions from './part_definitions.json';
const DNA_BITS = 2 * 8;
const GENE_SIZE = 2 ** DNA_BITS;
const HEX_COUNT = DNA_BITS / 4;
const MAX_WHITESPACE = 4;
const GENE_TYPES = [
'mouths',
'WHITESPACE',
'eyes',
'insides',
'WHITESPACE',
'sides',
'arms',
'outsides',
'WHITESPACE'
];
// Creates an empty array of a given length
const emptyArray = length => {
return Array.apply(null, Array(length));
};
// A shallow non-recursive flatten to use with reduce
const flatten = (flattened, itemOrArray) => {
return flattened.concat(itemOrArray);
};
// A predicate function for use with filter
const unique = (item, i, items) => {
return !items.slice(0, i).includes(item);
};
// Transform the part definitions into arrays of tuples, where each part
// gets one entry per appearance. The first index of the tuple is the part,
// the second is the tags associated with the part.
//
// The final object will follow this format:
// {
// mouths: [[<part>, [<tags>]], [<part>, [<tags>]]],
// eyes: [ ... ],
// ...
// }
const PARTS = Object.keys(definitions).reduce((parts, type) => {
parts[type] = Object.keys(definitions[type]).map(part => {
const { count, tags } = definitions[type][part];
return emptyArray(count).map(() => [part, tags]);
}).reduce(flatten, []);
return parts;
}, {});
// Converts a hexadecimal string into an array of integers
const hexToInts = hexString => {
return hexString
.match(RegExp(`[0-9a-f]{${HEX_COUNT},${HEX_COUNT}}`, 'g'))
.map(hex => parseInt(hex, 16));
};
// Converts an integer into an array of booleans
const intToSpacingGuide = (spacingInt) => {
const bits = spacingInt.toString(2);
return ('0'.repeat(DNA_BITS) + bits).slice(-DNA_BITS)
.split('')
.map(bit => !Number(bit))
.map((space, i, spaces) => {
const tooManySpaces = i >= MAX_WHITESPACE
&& spaces.slice(i - MAX_WHITESPACE, i).every(s => s);
return tooManySpaces
? [ false, space ]
: space;
})
.reduce(flatten, []);
};
// Convert an array of integers to part tuples
const intsToParts = ints => {
return ints.map((int, i) => {
const type = GENE_TYPES[i];
if (type === 'WHITESPACE') {
return [ intToSpacingGuide(int), [] ];
}
const index = Math.floor(int * (PARTS[type].length / GENE_SIZE));
return PARTS[type][index];
});
};
// Pad the characters of a part with whitespace
const spacePart = (partChars, spacingGuide) => {
const chars = partChars.split('').reverse();
let spacedPart = '';
for (let i = 0; true; i++) {
if (i >= spacingGuide.length) {
i = 0;
}
if (spacingGuide[i]) {
spacedPart += ' ';
} else {
const char = chars.pop();
if (!char) {
return spacedPart;
}
spacedPart += char;
}
}
};
// A function to be used with map, which spaces out parts
const spaceParts = (part, i, parts) => {
if (Array.isArray(parts[i])) {
return null;
}
if (Array.isArray(parts[i + 1])) {
return spacePart(part, parts[i + 1]);
}
return part;
};
// Combines an array of parts into a single kaomoji string
const combineParts = parts => {
const armsIndex = GENE_TYPES
.filter(type => type !== 'WHITESPACE')
.findIndex(type => type === 'arms');
const combined = parts.reduce((combined, part, i) => {
if (i !== armsIndex) {
return part.replace('%', combined);
}
const isOffRight = part.length === 3
&& part[0] === '%'
&& part[1] === part[2];
if (isOffRight) {
return combined[0] + part[1] + combined.slice(1) + part[2];
}
const isOffLeft = part.length === 3 &&
part[2] === '%' &&
part[0] === part[1];
if (isOffLeft) {
return part[0] + combined.slice(0, -1) + part[1] + combined.slice(-1);
}
return part.replace('%', combined);
});
return combined.trim();
};
/**
* Takes a 36 character hexadecimal DNA string and returns an object
* with two keys:
* - view: a string, the actual characters of the moji to display
* - tags: an array of strings, tags associated with this moji
*
* Example:
* const moji = parseDna('ad41bd46798e8fc24aa33c29b564ba3a644e');
* console.log(moji.view) // '٩( * ᵒ⌄ ᵒ ꐐ * )۶'
* console.log(moji.tags) // [ 'happy', 'bear', 'sad' ]
*/
export const parseDna = dna => {
const dnaArray = hexToInts(dna);
const partsAndTags = intsToParts(dnaArray);
const parts = partsAndTags
.map(([ part, _ ]) => part)
.map(spaceParts)
.filter(part => part !== null);
const tags = partsAndTags
.map(([ _, tags ]) => tags)
.reduce(flatten, [])
.filter(unique);
return {
tags,
view: combineParts(parts)
};
};