85 lines
1.9 KiB
JavaScript
85 lines
1.9 KiB
JavaScript
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const { Glib, fn } = require('../../lib');
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const MODES = {
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NORMAL: Symbol('normal'),
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ESCAPE: Symbol('escape'),
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HEX: Symbol('hex'),
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};
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const BACKSLASH = '\\';
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const QUOTE = '"';
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const X = 'x';
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const decode = (input) => {
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let mode = MODES.NORMAL;
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let storage = null;
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return Glib.fromIterable(input).flatMap((char) => {
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switch (mode) {
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case MODES.NORMAL:
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switch (char) {
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case QUOTE:
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return [];
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case BACKSLASH:
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mode = MODES.ESCAPE;
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return [];
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default:
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return [char];
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}
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case MODES.ESCAPE:
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switch (char) {
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case BACKSLASH:
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mode = MODES.NORMAL;
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return [BACKSLASH];
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case QUOTE:
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mode = MODES.NORMAL;
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return [QUOTE];
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case X:
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mode = MODES.HEX;
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return [];
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default:
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console.log(char);
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throw new Error('invalid escape');
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}
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case MODES.HEX:
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if (storage == null) {
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storage = char;
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return [];
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} else {
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char = String.fromCharCode(parseInt(`${storage}${char}`, 16));
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storage = null;
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mode = MODES.NORMAL;
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return [char];
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}
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default:
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throw new Error('bad mode');
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}
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});
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};
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const encode = (input) =>
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Glib.concat(
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QUOTE,
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Glib.fromIterable(input).flatMap((char) => {
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switch (char) {
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case QUOTE:
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return [BACKSLASH, QUOTE];
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case BACKSLASH:
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return [BACKSLASH, BACKSLASH];
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default:
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return [char];
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}
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}),
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QUOTE,
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);
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module.exports = {
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'1': (input) =>
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Glib.fromLines(input)
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.map((i) => BigInt(i.length) - decode(i).length)
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.sum(),
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'2': (input) =>
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Glib.fromLines(input)
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.map((i) => encode(i).length - BigInt(i.length))
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.sum(),
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};
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