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base45: Implement highlighting

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This commit is contained in:
Thomas Weißschuh 2021-09-17 08:32:08 +02:00
parent 6017578964
commit 7db1f39473
3 changed files with 37 additions and 4 deletions
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27
src/core/lib/Base45.mjs Normal file
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@ -0,0 +1,27 @@
/**
* Base45 resources.
*
* @author Thomas Weißschuh [thomas@t-8ch.de]
* @copyright Crown Copyright 2021
* @license Apache-2.0
*/
/**
* Highlight to Base45
*/
export function highlightToBase45(pos, args) {
pos[0].start = Math.floor(pos[0].start / 2) * 3;
pos[0].end = Math.ceil(pos[0].end / 2) * 3;
return pos;
}
/**
* Highlight from Base45
*/
export function highlightFromBase45(pos, args) {
pos[0].start = Math.floor(pos[0].start / 3) * 2;
pos[0].end = Math.ceil(pos[0].end / 3) * 2;
return pos;
}
export const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:";

7
src/core/operations/FromBase45.mjs
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@ -4,6 +4,7 @@
* @license Apache-2.0
*/
import {ALPHABET, highlightToBase45, highlightFromBase45} from "../lib/Base45.mjs";
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils.mjs";
@ -26,6 +27,9 @@ class FromBase45 extends Operation {
this.infoURL = "https://wikipedia.org/wiki/List_of_numeral_systems";
this.inputType = "string";
this.outputType = "byteArray";
this.highlight = highlightFromBase45;
this.highlightReverse = highlightToBase45;
}
/**
@ -34,7 +38,6 @@ class FromBase45 extends Operation {
* @returns {byteArray}
*/
run(input, args) {
const alphabet = Utils.expandAlphRange("0-9A-Z $%*+-./:").join("");
if (!input) return [];
const res = [];
@ -43,7 +46,7 @@ class FromBase45 extends Operation {
triple.reverse();
let b = 0;
for (const c of triple) {
const idx = alphabet.indexOf(c);
const idx = ALPHABET.indexOf(c);
if (idx === -1) {
throw new OperationError(`Character not in alphabet: '${c}'`);
}

7
src/core/operations/ToBase45.mjs
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@ -4,6 +4,7 @@
* @license Apache-2.0
*/
import {ALPHABET, highlightToBase45, highlightFromBase45} from "../lib/Base45.mjs";
import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
@ -31,6 +32,9 @@ class ToBase45 extends Operation {
value: "0-9A-Za-z"
}
];
this.highlight = highlightToBase45;
this.highlightReverse = highlightFromBase45;
}
/**
@ -39,7 +43,6 @@ class ToBase45 extends Operation {
* @returns {string}
*/
run(input, args) {
const alphabet = Utils.expandAlphRange("0-9A-Z $%*+-./:").join("");
input = new Uint8Array(input);
if (!input) return "";
@ -54,7 +57,7 @@ class ToBase45 extends Operation {
let chars = 0;
do {
res.push(alphabet[b % 45]);
res.push(ALPHABET[b % 45]);
chars++;
b = Math.floor(b / 45);
} while (b > 0);