parser: use %empty

[bison.git] / data / c-like.m4

diff --git a/data/c-like.m4 b/data/c-like.m4
index c2abce7e1df55e63b97579642c3f79cf1bafdbc6..eb06de2a4dcf451cfa6c3be8066d21c4631408d0 100644 (file)
--- a/data/c-like.m4
+++ b/data/c-like.m4
@@ -2,7 +2,7 @@
 
 # Common code for C-like languages (C, C++, Java, etc.)
 
-# Copyright (C) 2012 Free Software Foundation, Inc.
+# Copyright (C) 2012-2013 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
@@ -17,16 +17,37 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# b4_comment_(TEXT, OPEN, CONTINUE, END)
+# --------------------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+#
+# Prefix all the output lines with PREFIX.
+m4_define([b4_comment_],
+[$2[]m4_bpatsubst(m4_expand([[$1]]), [
+\(.\)], [
+$3\1])$4])
+
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# Put TEXT in comment.  Prefix all the output lines with PREFIX.
+m4_define([b4_comment],
+[b4_comment_([$1], [$2/* ], [$2   ], [  */])])
+
+
+
+
 # b4_dollar_dollar_(VALUE, FIELD, DEFAULT-FIELD)
 # ----------------------------------------------
 # If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
 # otherwise just VALUE.  Be sure to pass "(VALUE)" is VALUE is a
 # pointer.
 m4_define([b4_dollar_dollar_],
-[m4_if([$2], [[]],
-       [m4_ifval([$3], [($1.$3)],
-                 [$1])],
-       [($1.$2)])])
+[b4_symbol_value([$1],
+                 m4_if([$2], [[]],
+                       [[$3]], [[$2]]))])
 
 # b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION)
 # b4_dollar_popdef