TypeError: Parser.parse() got an unexpected keyword argument 'on_error'

[aspizu]

ERROR:root:parser raised exception
Traceback (most recent call last):
  File "/home/aspizu/Projects/goboscript-lsp/goboscript-lsp/diag.py", line 32, in get_diagnostics
    parser.parse(doctext, on_error=on_error)
  File "/usr/lib/python3.11/site-packages/lark/lark.py", line 645, in parse
    return self.parser.parse(text, start=start, on_error=on_error)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/lark/parser_frontends.py", line 96, in parse
    return self.parser.parse(stream, chosen_start, **kw)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Parser.parse() got an unexpected keyword argument 'on_error'

[MegaIng]

on_error is only supported for parser='lalr'. Can you provide an actual reproducer script please?

[aspizu]

yes was using earley, this should be reported

[aspizu]

another suggestion is that instead of a string definiing what parser to use
just impor the parser class and pass it to Lark so you can use typing to convey that earley doesnt support on_error

[erezsh]

I agree, a better error is warranted.

If we want to be type-friendly, we can define different interfaces for each parser, and use @overload to return the correct one based on the parser name (using Literal etc.).