[CI Broken] Format Check failing due to unformatted files and malformed code blocks

[ChrisRackauckas-Claude]

Summary

The Format Check CI job is failing on the main branch. All actual tests pass, but the formatting check is broken.

Failed CI job: Format Check / Check Formatting
CI Run: https://github.com/SciML/BaseModelica.jl/actions/runs/20581996115/job/59111253685

What's broken

1. Files not formatted according to SciMLStyle

The following files need to be formatted with JuliaFormatter using SciMLStyle:

• grammar/README.md
• src/ast.jl
• src/evaluator.jl
• src/julia_parser.jl
• src/scratch.jl
• test/test_antlr_parser.jl
• test/test_error_messages.jl
• test/test_julia_parser.jl

2. Files with parsing errors (JuliaFormatter cannot process)

These files have malformed code blocks that cause JuliaFormatter to fail with parsing errors:

• README.md: Unterminated string literal at line 4:59 (likely a malformed code block)
• src/BaseModelica.jl: Unterminated string literal at line 5:44 (docstring contains unescaped backticks)
• src/antlr_parser.jl: Unterminated string literal at line 3:70 (docstring contains unescaped backticks)

Error messages from CI logs:

Warning: Failed to format file /home/runner/work/BaseModelica.jl/BaseModelica.jl/README.md due to a parsing error, skipping file
  error =
   ParseError:
   # Error @ line 4:59
   sys = parse_basemodelica("path/to/ExampleFirstOrder.bmo")
   # └ ── unterminated string literal

Root Cause Analysis

The docstrings in src/BaseModelica.jl and src/antlr_parser.jl contain triple-backtick code blocks that confuse JuliaFormatter's parser. The README.md also has a duplicated \``juliaon line 47 (the markdown has```juliafollowed immediately by```julia` on the next line).

Suggested Fix Approach

1. Fix the malformed code block in README.md (remove the duplicate \``julia` line)
2. Format all the source and test files using JuliaFormatter:

   using JuliaFormatter
   format("src/ast.jl", SciMLStyle())
   format("src/evaluator.jl", SciMLStyle())
   format("src/julia_parser.jl", SciMLStyle())
   format("src/scratch.jl", SciMLStyle())
   format("test/test_antlr_parser.jl", SciMLStyle())
   format("test/test_error_messages.jl", SciMLStyle())
   format("test/test_julia_parser.jl", SciMLStyle())
   format("grammar/README.md", SciMLStyle())

3. For the docstrings with code blocks, either escape the backticks or restructure the docstrings

Note

This issue was discovered during an automated CI health check. All actual tests pass - this is purely a formatting check issue.

cc @ChrisRackauckas