simplemind2plantuml.js

//Usage: node simplemind2plantuml.js <path/to/smmx> > output.plantuml
//Requires fast-xml-parser and he npm modules
const xml = require('fast-xml-parser');
const he = require('he');
const fs = require('fs').promises;

function componentToHex(c) {
    const hex = parseInt(c).toString(16);
    return hex.length == 1 ? "0" + hex : hex;
  }
  
  function rgbToHex(r, g, b) {
    return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
  }

function traverse(root, prefix = '*') {
    let flags = '';
    if(root.style && root.style.fillcolor) {
        const {r,g,b} = root.style.fillcolor;
        flags += '['+rgbToHex(r,g,b)+']';
    }

    let text = root.text.replace(/\\N/g, '\n');
    
    if(text.includes('\n')) {
        text += ';';
        flags += ':';
    }

    console.log(prefix + flags, text);
    root.children.forEach(child => traverse(child, prefix+'*'));
}

fs.readFile(process.argv[2], 'utf-8').then(data => {
    const mmdata = xml.parse(data, {
        attributeNamePrefix: '',
        ignoreAttributes: false,
        attrValueProcessor: (val, attrName) => he.decode(val, {isAttributeValue: true}),//default is a=>a
    });
    const mindmap = mmdata['simplemind-mindmaps'].mindmap.topics.topic;

    const lookup = new Map();
    const root = mindmap.find(topic => topic.parent === '-1');
    mindmap.forEach(topic => {
        topic.children = [];
        lookup.set(topic.id, topic);
    });

    mindmap.forEach(topic => {
        if(topic.parent === '-1') return;
        lookup.get(topic.parent).children.push(topic);
    });

    console.log('@startmindmap');
    traverse(root);
    console.log('@endmindmap');
});