andreas-wilm / nim-gmlparser

Experimental code for parsing GML files with Nim

Parsing Graph Modelling Language (GML) files with Nim

This repo contains some Nim code for parsing Graph Modelling Language (GML) files. It's very simple, but did the job for me.

• gml_to_edge_list.nim is a simple application, listing edges in a graph
• graph.nim is the module between the application and the gml.nim
• gml.nim is the interface to GML C library from the Faculty of Computer Science and Mathematics of the University of Passau

gml_to_edge_list.nim

gml_to_edge_list converts a GML file to a list of edges listing a user defined attribute per edge and node (making using of graph.nim see below).

Compile with

nim c gml_to_edge_list.nim

And run with, e.g.

./gml_to_edge_list -e 'weight' -n 'label' -g <your.gml>

graph.nim

A super-simple graph module interfacing with the parser library (see below). It contains a simple demo. Compile with

nim c graph.nim

and run with

./graph <your.gml>

This assumes that your nodes have a numeric id and edges have at least a source and a target.

gml.nim

This is the Nim wrapper for a GML C library from the Faculty of Computer Science and Mathematics of the University of Passau. Its website can still be found at web.archive.org (as also referenced by Networkx's GML section). The contents are mirrored here as gml-parser.tar.gz and the required components can be found in the lib directory, including the license (see lib/COPYING).

A low-level Nim demo, which works similar to the original gml_demo.c and simply prints entries as they are parsed, can be found in gml_demo.nim. Compile with

nim c gml_demo.nim

and run with

./gml_demo <your.gml>