pdf-to-markdown/src/javascript/models/TextItemLineGrouper.jsx

import TextItem from './TextItem.jsx';
import { sortByX } from '../textItemFunctions.jsx'

//Groups all text items which are on the same y line
export default class TextItemLineGrouper {

    constructor(options) {
        this.mostUsedDistance = options.mostUsedDistance || 12;
    }

    // returns a CombineResult 
    group(textItems: TextItem[]) {
        return this.groupItemsByLine(textItems);
    }


    groupItemsByLine(textItems:TextItem[]) {
        const lines = [];
        var currentLine = [];
        textItems.forEach(item => {
            if (currentLine.length > 0 && Math.abs(currentLine[0].y - item.y) >= this.mostUsedDistance / 2) {
                lines.push(currentLine);
                currentLine = [];
            }
            currentLine.push(item);
        });
        lines.push(currentLine);

        lines.forEach(lineItems => {
            // we can't trust order of occurence, esp. footnoteLinks like to come last
            sortByX(lineItems);
        });
        return lines;
    }

}