d: support api.parser.extends and api.parser.implements

The D skeleton was not properly supporting them.

* data/skeletons/d.m4: Fix it.
* tests/d.at: Check it.
* tests/local.mk, tests/testsuite.at: Adjust.

data/skeletons/d.m4

@@ -58,6 +58,23 @@ m4_define([b4_percent_define_get3],
           [m4_ifval(m4_quote(b4_percent_define_get([$1])),
                 [$2[]b4_percent_define_get([$1])[]$3], [$4])])
 
+# b4_percent_define_if_get2(ARG1, ARG2, DEF, NOT)
+# -----------------------------------------------
+# Expand to the value of DEF if ARG1 or ARG2 are %define'ed,
+# otherwise NOT.
+m4_define([b4_percent_define_if_get2],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$3], [m4_ifval(m4_quote(b4_percent_define_get([$2])),
+                      [$3], [$4])])])
+
+# b4_percent_define_class_before_interface(CLASS, INTERFACE)
+# ----------------------------------------------------------
+# Expand to a ', ' if both a class and an interface have been %define'ed
+m4_define([b4_percent_define_class_before_interface],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [m4_ifval(m4_quote(b4_percent_define_get([$2])),
+                      [, ])])])
+
 
 # b4_flag_value(BOOLEAN-FLAG)
 # ---------------------------
@@ -78,8 +95,10 @@ b4_percent_define_flag_if([api.parser.public],   [public ])dnl
 b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
 b4_percent_define_flag_if([api.parser.final],    [final ])dnl
 [class ]b4_parser_class[]dnl
-b4_percent_define_get3([api.parser.extends], [ extends ])dnl
+b4_percent_define_if_get2([api.parser.extends], [api.parser.implements], [ : ])dnl
-b4_percent_define_get3([api.parser.implements], [ implements ])])
+b4_percent_define_get([api.parser.extends])dnl
+b4_percent_define_class_before_interface([api.parser.extends], [api.parser.implements])dnl
+b4_percent_define_get([api.parser.implements])])
 
 
 # b4_lexer_if(TRUE, FALSE)

tests/d.at

@@ -0,0 +1,82 @@
+# D features tests.                      -*- Autotest -*-
+
+# Copyright (C) 2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_BANNER([[D Features.]])
+
+# AT_CHECK_D_MINIMAL([DIRECTIVES], [PARSER_ACTION], [POSITION_CLASS], [EXTRA_USER_CODE])
+# ----------------------------------------------------------------------
+# Check that a minimal parser with DIRECTIVES compiles in D.
+# Put the D code in YYParser.d.
+m4_define([AT_CHECK_D_MINIMAL],
+[
+AT_DATA([[YYParser.y]], [
+%language "D"
+%token END "end"
+[$1]
+%%
+start: END {$2};
+%%
+[$4]
+void main() {}
+])
+AT_BISON_CHECK([[-Wno-deprecated YYParser.y]])
+AT_CHECK([[grep '[mb]4_' YYParser.y]], [1], [ignore])
+AT_COMPILE_D([[YYParser]])
+])
+
+# AT_CHECK_D_GREP([LINE], [COUNT=1])
+# -------------------------------------
+# Check that YYParser.d contains exactly COUNT lines matching ^LINE$
+# with grep.
+m4_define([AT_CHECK_D_GREP],
+[AT_CHECK([grep -c '^$1$' YYParser.d], [ignore], [m4_default([$2], [1])
+])])
+
+## -------------------------------------- ##
+## D parser class extends and implements. ##
+## -------------------------------------- ##
+
+AT_SETUP([D parser class extends and implements])
+AT_KEYWORDS([d])
+
+AT_CHECK_D_MINIMAL([])
+AT_CHECK_D_GREP([[class YYParser]])
+
+AT_CHECK_D_MINIMAL([%define api.parser.extends {BaseClass}], [], [], [class BaseClass {}])
+AT_CHECK_D_GREP([[class YYParser : BaseClass]])
+
+AT_CHECK_D_MINIMAL([%define api.parser.extends {Interface}], [], [], [interface Interface {}])
+AT_CHECK_D_GREP([[class YYParser : Interface]])
+
+AT_CHECK_D_MINIMAL(
+[%define api.parser.extends {BaseClass}
+%define api.parser.implements {Interface}], [], [],
+[class BaseClass {}
+interface Interface {}
+])
+AT_CHECK_D_GREP([[class YYParser : BaseClass, Interface]])
+
+AT_CHECK_D_MINIMAL(
+[%define api.parser.extends {BaseClass}
+%define api.parser.implements {Interface1, Interface2}], [], [],
+[class BaseClass {}
+interface Interface1 {}
+interface Interface2 {}
+])
+AT_CHECK_D_GREP([[class YYParser : BaseClass, Interface1, Interface2]])
+
+AT_CLEANUP

tests/local.mk

@@ -57,6 +57,7 @@ TESTSUITE_AT =                                \
   %D%/conflicts.at                            \
   %D%/counterexample.at                       \
   %D%/cxx-type.at                             \
+  %D%/d.at                                    \
   %D%/diagnostics.at                          \
   %D%/existing.at                             \
   %D%/glr-regression.at                       \

tests/testsuite.at

@@ -87,6 +87,9 @@ m4_include([c++.at])
 m4_include([java.at])
 m4_include([javapush.at])
 
+# Parsers in D
+m4_include([d.at])
+
 # GLR.
 # C++ types, simplified
 m4_include([cxx-type.at])