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| function CreateSequence(encodeLen, alphabetLen) { | |
| let sequence = [Math.pow(10, encodeLen)] | |
| for (let i = 1; i <= encodeLen; i++) { | |
| sequence.push( | |
| sequence[i-1] + | |
| Math.pow(10, encodeLen - i) * Math.pow(alphabetLen, i) | |
| ); | |
| } | |
| return sequence | |
| } | |
| // Value, valor a convertir | |
| // encodeLen, tamaño de la codificación | |
| // alphabetLen tamaño del alfabeto | |
| // Encode(17575, 3, 26) => "ZZZ" | |
| // Encode(3601, 3, 26) => "1AA" | |
| // Encode(3600, 3, 26) => "0AA" | |
| // Encode(3599, 3, 26) => "99A" | |
| // Encode(0, 3, 26) => "000" | |
| function Encode(value, encodeLen, alphabetLen) { | |
| let sequence = CreateSequence(encodeLen, alphabetLen) | |
| let ix = 0 | |
| // Se busca en la secuencia los niveles donde la base cambia y se obtiene la base | |
| // de las letras | |
| while (value >= sequence[ix]) ix++; | |
| ix--; | |
| // El caso de que no hay letras | |
| let newValue | |
| if (ix < 0) { | |
| newValue = value | |
| } | |
| else { | |
| newValue = value - sequence[ix] | |
| } | |
| console.log(newValue) | |
| // Se obtienen las letras según la base anterior ix | |
| let letters = [] | |
| for (let i = ix; i >= 0; i--) { | |
| let result = Math.pow(10, encodeLen - 1 - ix) * Math.pow(alphabetLen, i) | |
| letters.push(GetChar(newValue / result)) | |
| newValue = newValue % result; | |
| } | |
| return (newValue != 0 ? newValue : "0".repeat(encodeLen - 1 - ix)) + letters.join("") | |
| } | |
| function GetChar(value) { | |
| return String.fromCharCode(65 + value) | |
| } | |
| function Decode(charExpr, alphabetLen) { | |
| // TODO | |
| } | |
| // export default {CreateSequence, Encode, GetChar} |
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