Re: Include column in syntax error message

[Chet Ramey]

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On 12/22/15 6:17 PM, Karl-Philipp Richter wrote:
> Hi,
> Currently, syntax error messages like ``bash: syntax error near
> unexpected token `;'``, e.g. after issuing `echo a &; echo b &; echo c
> &;` aren't as helpful as they could be. It'd be nice to know at which
> column, i.e. which `;`, the message refers to by adding the column to
> the error message, e.g. ``bash: syntax error near unexpected token `;'
> (col. y)``.

That's not easy to do with yacc/bison, which often reads one or more tokens
ahead before determining whether or not a syntax error occurred.  That's
why the error message uses the token that caused the error, not the current
input string index.


- -- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/
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