Disable adjacent string concatenation.

The adjacent string concatenation feature doesn't work well with
multiple-argument statements.  The common example (found in GNU
pies) is the "env" statement:

  env "PATH=/sbin:$PATH" "PRELOAD=true"

The intent was to pass it two arguments, but in fact they get
concatenated into one.

To control this, the grecs_parser_options variable is introduced.
If it has the GRECS_OPTION_QUOTED_STRING_CONCAT bit set, adjacent
string concatenation is enabled.  By default it is disabled.

The GRECS_OPTION_ADJUST_STRING_LOCATIONS bit controls the way the
quoted sring locations are computed.  If it is set, the beginning of
the string is counted at the first character after the opening double
quote, and its end at the character immediately preceding the closing
double quote.  Otherwise, both double-quote characters are included in
the location (the default).

The change is backward incompatible.

* doc/grecs-syntax.texi: Update.
* include/grecs/parser.h (grecs_adjust_string_locations): Remove.
(grecs_parser_options): New extern.
* src/grecs-lex.l: QSTRING is returned only if
GRECS_OPTION_QUOTED_STRING_CONCAT option is set.
The GRECS_OPTION_ADJUST_STRING_LOCATIONS option controls string locus
adjustment.
* src/parser.c (grecs_adjust_string_locations): Remove.
(grecs_parser_options): New variable.

* tests/Makefile.am: Add strcat.at, stradj.at
* tests/testsuite.at: Likewise.
* tests/gcffmt.c: New options -strcat and -stradj
* tests/stradj.at: New test case.
* tests/strcat.at: New test case.

1 files changed, 2 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9bf28da..65f590a 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -121,6 +121,8 @@ TESTSUITE_AT = \
  set.at\
  sort00.at\
  sort01.at\
+ stradj.at\
+ strcat.at\
  testsuite.at\
  vercmp.at\
  wordsplit.at\