Akim Demaille 1b70f687fa diagnostics: fix styling issues ...

Single point locations (equal boundaries) are troublesome, and we were
incorrectly ending the style in their case.  Which results in an abort
in libtextstyle.

There is also a confusion between columns as displayed on the
screen (which take into account multibyte characters and tabulations),
and the number of bytes.  Counting the screen-column
incrementally (character by character) is uneasy (because of multibyte
characters), and I don't want to maintain a buffer of the current line
when displaying the diagnostic.  So I believe the simplest solution is
to track the byte number in addition to the screen column.

* src/location.h, src/location.c (boundary): Add the byte-column.
Adjust dependencies.
* src/getargs.c, src/scan-gram.l: Adjust.
* tests/diagnostics.at: Check zero-width locations.

2019-04-23 18:29:10 +02:00

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