Intro

graphml-js is a simple GraphML parser written in TypeScript, for use in JavaScript projects. It is far from feature complete, and currently only includes the minimum functionality I need for a project I'm working on. However, it should be easy to add features in the future as needed by me or others.

Example Usage

graphml-js takes in a GraphML file, and returns a Graph object, which contains nodes and edges properties, which are both arrays of Node and Edge objects, respectively.

The following example is included in the examples directory.

Given the following graph taken from the GraphML Primer:

primer.graphml:

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"  
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns 
        http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
  <key id="d0" for="node" attr.name="color" attr.type="string">
    <default>yellow</default>
  </key>
  <key id="d1" for="edge" attr.name="weight" attr.type="double"/>
  <graph id="G" edgedefault="undirected">
    <node id="n0">
      <data key="d0">green</data>
    </node>
    <node id="n1"/>
    <node id="n2">
      <data key="d0">blue</data>
    </node>
    <node id="n3">
      <data key="d0">red</data>
    </node>
    <node id="n4"/>
    <node id="n5">
      <data key="d0">turquoise</data>
    </node>
    <edge id="e0" source="n0" target="n2">
      <data key="d1">1.0</data>
    </edge>
    <edge id="e1" source="n0" target="n1">
      <data key="d1">1.0</data>
    </edge>
    <edge id="e2" source="n1" target="n3">
      <data key="d1">2.0</data>
    </edge>
    <edge id="e3" source="n3" target="n2"/>
    <edge id="e4" source="n2" target="n4"/>
    <edge id="e5" source="n3" target="n5"/>
    <edge id="e6" source="n5" target="n4">
      <data key="d1">1.1</data>
    </edge>
  </graph>
</graphml>

And the following node code:

simple_example.js:

var graphml = require('graphml-js');
var fs = require('fs');

var graphmlText = fs.readFileSync('primer.graphml');
var parser = new graphml.GraphMLParser();

parser.parse(graphmlText, function(err, graph) {
    console.log(graph);
});

The output is:

Graph {
  nodes: 
   [ Node { _id: 'n0', _attributes: [Object] },
     Node { _id: 'n1', _attributes: {} },
     Node { _id: 'n2', _attributes: [Object] },
     Node { _id: 'n3', _attributes: [Object] },
     Node { _id: 'n4', _attributes: {} },
     Node { _id: 'n5', _attributes: [Object] } ],
  edges: 
   [ Edge { _id: 'e0', _attributes: [Object], _source: 'n0', _target: 'n2' },
     Edge { _id: 'e1', _attributes: [Object], _source: 'n0', _target: 'n1' },
     Edge { _id: 'e2', _attributes: [Object], _source: 'n1', _target: 'n3' },
     Edge { _id: 'e3', _attributes: {}, _source: 'n3', _target: 'n2' },
     Edge { _id: 'e4', _attributes: {}, _source: 'n2', _target: 'n4' },
     Edge { _id: 'e5', _attributes: {}, _source: 'n3', _target: 'n5' },
     Edge { _id: 'e6', _attributes: [Object], _source: 'n5', _target: 'n4' } ] }