(*
  Source:  https://github.com/io7m/jsom0
  License: ISC
*)

vertex_p3n3_name =
  "vertex_p3n3" ;

vertex_p3n3t2_name =
  "vertex_p3n3t2" ;

vertex_type =
  vertex_p3n3_name | vertex_p3n3t2_name ;

vertex_position =
  "position" , real , real , real , ";" ;

vertex_normal =
  "normal" , real , real , real , ";" ;

vertex_uv =
  "uv" , real , real , ";" ;

vertex_p3n3 =
  vertex_p3n3_name , vertex_position , vertex_normal , "end" , ";" ;

vertex_p3n3t2 =
  vertex_p3n3t2_name , vertex_position , vertex_normal , vertex_uv , "end" , ";" ;

vertex =
  vertex_p3n3 | vertex_p3n3t2 ;

vertex_array =
  "array" , positive , vertex_type , { vertex } , "end" , ";" ;

vertices =
  "vertices" , ";" , vertex_array , "end" , ";" ;

triangle =
  "triangle" , natural , natural , natural , ";" ;

triangle_array =
  "array" , positive, "triangle" , { triangle } , "end" , ";" ;

triangles =
  "triangles" , ";" , triangle_array , "end" , ";" ;

name =
  "name" , string , ";" ;

material_name =
  "material_name" , string , ";" ;

object =
  "object" , ";" ,
    name ,
    material_name ,
    vertices ,
    triangles ,
  "end" , ";" ;