Re: Syntax error messages

[Hans Åberg]

> On 27 Sep 2021, at 22:02, Akim Demaille <akim@lrde.epita.fr> wrote:
> 
> Hi Hans,
> 
>> Le 27 sept. 2021 à 20:54, Hans Åberg <haberg-1@telia.com> a écrit :
>> 
>> In order to generate better syntax error messages writing out the input line 
>> with the error and a line with a marker underneath, I thought of checking 
>> how Bison does it, but I could not find the place in its sources. 
>> —Specifically, a suggestion is to tweak YY_INPUT in the lexer to buffer one 
>> input line at a time, but Bison does not seem to do that.
> 
> No, I keep track of the byte offset in the file, and print from the file, 
> which I reopen to quote the source.

In C++, I can do that using tellg and seekg without reopening the file, and 
then search for the line, which is an easy hack.