java: lac: more tests, and some doc

I have more tests to enable for Java, and then we should be
done with this.


commit e9f2774af5673b4de9aa1befb88ecf732a77e06d
Author: Akim Demaille <[email protected]>
Date:   Tue Nov 3 09:15:44 2020 +0100

    java: lac: more tests, and some doc
    
    * doc/bison.texi: C++ and Java support LAC.
    * tests/input.at (LAC: Errors for %define): Generalize the test, and
    apply it to Java.

diff --git a/NEWS b/NEWS
index fd2af67d..f2c3a86d 100644
--- a/NEWS
+++ b/NEWS
@@ -49,6 +49,11 @@ GNU Bison NEWS
     ↳ e1  e2  "a"
       ↳ • ↳ ε
 
+*** Lookahead correction in Java
+
+  The Java skeleton (lalr1.java) now supports LAC, via the %define variable
+  parse.lac.
+
 
 * Noteworthy changes in release 3.7.3 (2020-10-13) [stable]
 
diff --git a/doc/bison.texi b/doc/bison.texi
index 38869b51..009755cd 100644
--- a/doc/bison.texi
+++ b/doc/bison.texi
@@ -6879,7 +6879,7 @@ introduced in 3.0 with support for @code{simple} and @code{verbose}.  Values
 @deffn Directive {%define parse.lac} @var{when}
 
 @itemize
-@item Languages(s): C (deterministic parsers only)
+@item Languages(s): C/C++ (deterministic parsers only), and Java.
 
 @item Purpose: Enable LAC (lookahead correction) to improve
 syntax error handling.  @xref{LAC}.
diff --git a/tests/input.at b/tests/input.at
index f5cd9c10..8cf58914 100644
--- a/tests/input.at
+++ b/tests/input.at
@@ -2608,42 +2608,32 @@ start: %empty;
 
 # Only "full" and "none" are accepted for parse.lac
 # Unknown values (such as "unsupported") are rejected
-AT_BISON_CHECK([[-Dparse.lac=none input.y]])
-AT_BISON_CHECK([[-Dparse.lac=none -L c++ input.y]])
-AT_BISON_CHECK([[-Dparse.lac=full input.y]])
-AT_BISON_CHECK([[-Dparse.lac=full -L c++ input.y]])
-AT_BISON_CHECK([[-Dparse.lac=unsupported input.y]],
+m4_foreach([b4_skel], [[yacc.c], [lalr1.cc], [lalr1.java]],
+[AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=none input.y]])
+AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=full input.y]])
+AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=unsupported input.y]],
                [[1]], [],
-[[<command line>:3: error: invalid value for %define variable 'parse.lac': 'unsupported'
-<command line>:3: note: accepted value: 'full'
-<command line>:3: note: accepted value: 'none'
-]])
-AT_BISON_CHECK([[-Dparse.lac=unsupported -L c++ input.y]],
-               [[1]], [],
-[[<command line>:3: error: invalid value for %define variable 'parse.lac': 'unsupported'
-<command line>:3: note: accepted value: 'full'
-<command line>:3: note: accepted value: 'none'
+[[<command line>:4: error: invalid value for %define variable 'parse.lac': 'unsupported'
+<command line>:4: note: accepted value: 'full'
+<command line>:4: note: accepted value: 'none'
 ]])
+])
 
 # parse.lac.* options are useless if LAC isn't actually activated.
-AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 input.y]],
+AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 -Dparse.lac.memory-trace=full input.y]],
                [[1]], [],
 [[<command line>:3: error: %define variable 'parse.lac.es-capacity-initial' is not used
-]])
-AT_BISON_CHECK([[-Dparse.lac.memory-trace=full input.y]],
-               [[1]], [],
-[[<command line>:3: error: %define variable 'parse.lac.memory-trace' is not used
+<command line>:4: error: %define variable 'parse.lac.memory-trace' is not used
 ]])
 
-# parse.lac.* options are useless in C++ even if LAC isn't actually activated.
-AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 -L C++ -Dparse.lac=full input.y]],
+# parse.lac.* options are useless in C++/Java even if LAC is actually activated.
+m4_foreach([b4_skel], [[lalr1.cc], [lalr1.java]],
+[AT_BISON_CHECK([[-S]b4_skel[ -Dparse.lac=full -Dparse.lac.es-capacity-initial=1 -Dparse.lac.memory-trace=full input.y]],
                [[1]], [],
-[[<command line>:3: error: %define variable 'parse.lac.es-capacity-initial' is not used
-]])
-AT_BISON_CHECK([[-Dparse.lac.memory-trace=full -L C++ -Dparse.lac=full input.y]],
-               [[1]], [],
-[[<command line>:3: error: %define variable 'parse.lac.memory-trace' is not used
+[[<command line>:5: error: %define variable 'parse.lac.es-capacity-initial' is not used
+<command line>:6: error: %define variable 'parse.lac.memory-trace' is not used
 ]])
+])
 
 AT_CLEANUP