taraskevizer/dist/lib/highlight-diff.js

Канвэртацыя акадэмічнага правапісу ў клясычны

import { replaceG } from './replace-g.js';
import { gobj } from '../dict/index.js';
const replaceGByOpposite = replaceG(($0) => gobj[$0]);
export const highlightDiff = (text, orig, isCyrillic, highlight) => {
    highlighting: for (let i = 0; i < text.length; i++) {
        const word = text[i];
        const oWord = orig[i];
        if (oWord === word)
            continue;
        const wordH = isCyrillic ? replaceGByOpposite(word) : word;
        if (oWord === wordH)
            continue;
        if (!word.includes('(')) {
            if (word.length === oWord.length) {
                text[i] = '';
                let j = 0;
                while (j < word.length) {
                    while (wordH[j] === oWord[j]) {
                        text[i] += word[j];
                        ++j;
                        if (j === word.length)
                            continue highlighting;
                    }
                    const first = j;
                    while (wordH[j] !== oWord[j] && j < word.length) {
                        ++j;
                    }
                    text[i] += highlight(word.slice(first, j));
                }
                continue;
            }
            if (isCyrillic) {
                const noSoftWord = word.replace(/ь/g, '');
                switch (oWord) {
                    case noSoftWord:
                        text[i] = word.replace(/ь/g, highlight('ь'));
                        continue;
                    case noSoftWord + 'ь':
                        text[i] = word.replace(/ь(?!$)/g, highlight('ь'));
                        continue;
                }
            }
        }
        const oWordEnd = oWord.length - 1;
        let lastI = word.length - 1;
        let lastOI = oWordEnd;
        while (wordH[lastI] === oWord[lastOI]) {
            --lastI;
            --lastOI;
        }
        if (lastI < 1) {
            // beginning removed -> first letter
            text[i] = highlight(word[0]) + word.slice(1);
            continue;
        }
        let firstI = 0;
        while (wordH[firstI] === oWord[firstI])
            ++firstI;
        if (firstI === word.length) {
            // ending removed -> last letter
            text[i] = word.slice(0, lastI) + highlight(word[lastI]);
        }
        else if (firstI === 0 && lastOI === oWordEnd) {
            // first and last letters changed -> whole word
            text[i] = highlight(word);
            continue;
        }
        ++lastI;
        if (firstI === lastI) {
            // part removed -> surrounding letters
            --firstI;
            ++lastI;
        }
        text[i] =
            word.slice(0, firstI) +
                highlight(word.slice(firstI, lastI)) +
                word.slice(lastI);
    }
};