Multiple input files

[liangjs]

How do we handle multiple input files during parsing? For example, when the C/C++ preprocessor encounters the include macro, it needs to continue parsing the included file.

[liangjs]

By the way, how to get the current file name when reporting errors?

[foonathan]

You need to store the file name in the error reporting callback. If you're using lexy_ext::report_error you can use .path:

lexy/include/lexy_ext/report_error.hpp

Lines 360 to 364 in b53bd4a

	/// Specifies a path that will be printed alongside the diagnostic.
	constexpr _report_error path(const char* path) const
	{
	return {_iter, _opts, path};
	}

[foonathan]

This isn't something lexy supports natively. You need to record the #include statement and resolve it in a second pass.

If you absolutely need the contents to continue parsing, which is an unfortunate situation to be in, you can do that directly in side a scan rule: https://lexy.foonathan.net/reference/dsl/scan/#scan