@hyperbytes/wappler-codediff/server_connect/modules/textdiff.js

Compare two texts for differences

// JavaScript Document
const diff = require('diff');
exports.textdiff = async function (options, name) {

    const oldText = this.parseRequired(options.text1, "*", "No old text sent");
    const newText = this.parseRequired(options.text2, "*", "No new text sent");
    const multiline = this.parseOptional(options.multiline, "*", false);
    const usebr = this.parseOptional(options.usebr, "*", false);
    return analyzeTextChange(oldText, newText)

    function analyzeTextChange(oldText, newText) {
        const changes = diff.diffWords(oldText, newText);
        let changedWords = 0;
        let totalWords = 0;
        let addedChars = 0;
        let removedChars = 0;
        let changeDetails = [];
        let multidelim = usebr ? "<br>" : "/n";
        changes.forEach(part => {
            const trimmed = part.value.trim();
            const wordCount = trimmed.split(/\s+/).filter(Boolean).length;
            totalWords += wordCount;

            if (part.added) {
                changedWords += wordCount;
                addedChars += trimmed.length;
                changeDetails.push(`change: "Added: ${trimmed}"`);
            } else if (part.removed) {
                changedWords += wordCount;
                removedChars += trimmed.length;
                changeDetails.push(`change: "Removed: ${trimmed}"`);
            }
        });

        if (multiline) { changeDetails = changeDetails.join(multidelim) }
        const changeScore = totalWords === 0 ? 0 : Math.round((changedWords / totalWords) * 100);

        return {
            changes: changeDetails,
            changeScore,
            addedChars,
            removedChars
        };
    }


}