Add support for comments before class-definition

[AnHeuermann]

Description

Base Modelica generated by OpenModelica will always include a comment at the beginning of the file to note the Base Modelica "version" used to generate it. This breaks the parser. It expects the first word to be package.

How to reproduce

Comment.mo

//! base 0.1.0
package 'Comment'
  model 'Comment'
    Real 'x';
  equation
    der('x') = 'x';
  end 'Comment';
end 'Comment';

julia> BaseModelica.parse_basemodelica("comment.mo")
ERROR: ParserCombinator.ParserException("cannot parse")
Stacktrace:
 [1] once(channel::Channel{Any})
   @ ParserCombinator ~/.julia/packages/ParserCombinator/kIa3L/src/core/parsers.jl:196
 [2] single_result
   @ ~/.julia/packages/ParserCombinator/kIa3L/src/core/parsers.jl:201 [inlined]
 [3] (::ParserCombinator.var"#single_result#36"{ParserCombinator.var"#single_result#35#37"{@Kwargs{}, UnionAll}})(source::String, matcher::ParserCombinator.Transform)
   @ ParserCombinator ~/.julia/packages/ParserCombinator/kIa3L/src/core/parsers.jl:200
 [4] parse_str(data::String)
   @ BaseModelica ~/.julia/packages/BaseModelica/qCG6a/src/parser.jl:603
 [5] parse_file
   @ ~/.julia/packages/BaseModelica/qCG6a/src/parser.jl:610 [inlined]
 [6] parse_basemodelica(filename::String)
   @ BaseModelica ~/.julia/packages/BaseModelica/qCG6a/src/BaseModelica.jl:22
 [7] top-level scope
   @ REPL[4]:1

Versions 'n Stuff

• Julia Version 1.11.6
• BaseModelica v1.1.0
• OS: Ubuntu 24.04.3 LTS

[ChrisRackauckas]

#40