A node.js script to add node ids as node labels for a GraphML format readable by yEd. As next step after exporting without the label apparatus.

graphml-augment.js

const fs = require('fs');
const parser = require('xml2json');
const format = require('xml-formatter');

// true only for debugging, it messes the labels up because the space after <y:NodeLabel> and before the string gets included
const prettyPrint = false; 

const replaceAll = (str, find, replace) => {
    return str.replace(new RegExp(find, 'g'), replace);
};

const cleanId = id => {
    id = replaceAll(id, '<', '&lt;');
    id = replaceAll(id, '>', '&gt;');
    id = replaceAll(id, '&', '&amp;');
    return id;
};

fs.readFile( './dev.xml', (err, data) => {
    let jsonIn = JSON.parse(parser.toJson(data, { reversible: true }));
    let nodes = jsonIn.graph.node;
    let edges = jsonIn.graph.edge;

    // doesn't work if its just one node or one edge, then they are not an array but one object
    for (let i = 0; i < nodes.length; i ++) {
        let id = cleanId(nodes[i].id);
        nodes[i] = {
            id: id,
            data: {
                key: 'd6',
                'y:ShapeNode' : {
                    'y:NodeLabel': {
                        '$t': id
                    }
                }
            }
        };
    }

    for (let j = 0; j < edges.length; j ++) {
        edges[j] = {
            source: cleanId(edges[j].source),
            target: cleanId(edges[j].target)
        }
    }

    let jsonOut = {
        graphml: {
            'xmlns': 'http://graphml.graphdrawing.org/xmlns',
            'xmlns:java': 'http://www.yworks.com/xml/yfiles-common/1.0/java',
            'xmlns:sys': 'http://www.yworks.com/xml/yfiles-common/markup/primitives/2.0',
            'xmlns:x': 'http://www.yworks.com/xml/yfiles-common/markup/2.0',
            'xmlns:xsi': 'http://www.w3.org/2001/XMLSchema-instance',
            'xmlns:y': 'http://www.yworks.com/xml/graphml',
            'xmlns:yed': 'http://www.yworks.com/xml/yed/3',
            'xsi:schemaLocation': 'http://graphml.graphdrawing.org/xmlns http://www.yworks.com/xml/schema/graphml/1.1/ygraphml.xsd',
            // key: {
            //     for: 'hah',
            //     id: 'd6',
            //     'yfiles.type': 'nodegraphics'
            // }, 
            // DOES NOT WORK, it gets mixed up with the first node somehow
            // copy this above <graph> manually: <key for="node" id="d6" yfiles.type="nodegraphics"/>
            graph: {
                id: jsonIn.graph.id,
                node: nodes,
                edge: edges
            }
        }
    };

    let xml = parser.toXml(JSON.stringify(jsonOut));
    if (prettyPrint) {
        xml = format(xml);
    }

    fs.writeFile('out.graphml', xml, (err, data) => {
        if (err) { console.log(err); }
        else { console.log('export done'); }
    });
});