Re: Qeustion about Ftreesit_pattern_expand

[Yuan Fu <casouri@gmail.com>]

> On Jun 24, 2024, at 2:26 PM, Gerd Möllmann <gerd.moellmann@gmail.com> wrote:
> 
> Not important, just as context: I wanted to see if igc works with
> treesit Lisp objects, built with treesitter, and finally even got
> grammars for C and C++ installed :-/. Font-locking didn't work in my
> fork (CL packages), which I fixed.
> 
> My question:
> 
> Function Ftreesit_pattern_expand uses this to print Lisp objects:
> 
>  return Fprin1_to_string (pattern, Qnil, Qt);
> 
> where prin1 prints readably, and second arg nil means add escapes as
> needed to that the result can be read back, by function read.
> 
> Why is it printing readably with escapes?
> 
> I know tree-sitter doesn't understand Lisp escaping because that was my
> problem with the font-locking. Or, in other words, should the second arg
> be Qt for don't escape?
> 

Thanks for checking this Gerd. IIUC, readably is controlled by the second argument, so it’s not redundant: if the second arg is Qnil, print readably (prin1), if it’s Qt, print without quotes and escapes (princ). I guess the function should’ve been called print-to-string to avoid confusion.

Yuan