peterson / stl_treetop_parser

STL Treetop Parser

STL Treetop Parser

A nice little example of parsing nested multiline files with Treetop.

An STL file format represents 3D objects.

The treetop grammar doesn't yet return anything but text_value for each node but this could be extended to be a nicer structure.

File format

This is what an STL file looks like:

solid rect
facet normal 0.0 0.0 -1.0
   outer loop
      vertex 116.377952755906 66.1023622047244 0.0
      vertex 0.0 0.0 0.0
      vertex 0.0 66.1023622047244 0.0
   endloop
endfacet
facet normal 0.0 0.0 -1.0
   outer loop
      vertex 0.0 0.0 0.0
      vertex 116.377952755906 66.1023622047244 0.0
      vertex 116.377952755906 0.0 0.0
   endloop
endfacet
endsolid rect

The STL file format spec

Specs

Run the specs with

spec spec/stl_spec.rb --format specdoc