X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/0d8bed5636c07f932fdcb6ef04df749ab1c162d7..fe22d5d20ff5a88a3a0dba28a11623b235a422ab:/data/m4sugar/m4sugar.m4?ds=sidebyside

diff --git a/data/m4sugar/m4sugar.m4 b/data/m4sugar/m4sugar.m4
index bc965229..e2eced27 100644
--- a/data/m4sugar/m4sugar.m4
+++ b/data/m4sugar/m4sugar.m4
@@ -422,8 +422,8 @@ m4_define([m4_bmatch],
 [m4_if([$#], 0, [],
        [$#], 1, [],
        [$#], 2, [$2],
-       m4_bregexp([$1], [$2]), -1, [$0([$1], m4_shiftn(3, $@))],
-       [$3])])
+       [m4_if(m4_bregexp([$1], [$2]), -1, [$0([$1], m4_shiftn(3, $@))],
+	      [$3])])])
 
 
 # m4_map(MACRO, LIST)
@@ -432,11 +432,26 @@ m4_define([m4_bmatch],
 # of LIST (which can be lists themselves, for multiple arguments MACROs).
 m4_define([m4_fst], [$1])
 m4_define([m4_map],
-[m4_if([$2], [[]], [],
+[m4_if([$2], [], [],
+       [$2], [[]], [],
        [$1(m4_fst($2))[]dnl
 m4_map([$1], m4_cdr($2))])])
 
 
+# m4_map_sep(MACRO, SEPARATOR, LIST)
+# ----------------------------------
+# Invoke MACRO($1), SEPARATOR, MACRO($2), ..., MACRO($N) where $1, $2... $N
+# are the elements of LIST (which can be lists themselves, for multiple
+# arguments MACROs).
+m4_define([m4_map_sep],
+[m4_if([$3], [[]], [],
+       [$1(m4_fst($3))[]dnl
+m4_if(m4_cdr($3),
+      [[]], [],
+      [$2])[]dnl
+m4_map_sep([$1], [$2], m4_cdr($3))])])
+
+
 ## ---------------------------------------- ##
 ## 6. Enhanced version of some primitives.  ##
 ## ---------------------------------------- ##
@@ -469,7 +484,7 @@ m4_define([m4_bpatsubsts],
 # ------------------
 # This macro invokes all its arguments (in sequence, of course).  It is
 # useful for making your macros more structured and readable by dropping
-# unecessary dnl's and have the macros indented properly.
+# unnecessary dnl's and have the macros indented properly.
 m4_define([m4_do],
 [m4_if($#, 0, [],
        $#, 1, [$1],
@@ -615,7 +630,7 @@ m4_if($1, [$2], [],
 # Implementing `foreach' loops in m4 is much more tricky than it may
 # seem.  Actually, the example of a `foreach' loop in the m4
 # documentation is wrong: it does not quote the arguments properly,
-# which leads to undesired expansions.
+# which leads to undesirable expansions.
 #
 # The example in the documentation is:
 #
@@ -1484,7 +1499,7 @@ m4_define([m4_flatten],
 # of brackets around $1 (don't forget that the result must be quoted
 # too, hence one more quoting than applications).
 #
-# Then notice the 2 last pattens: they are in charge of removing the
+# Then notice the 2 last patterns: they are in charge of removing the
 # leading/trailing spaces.  Why not just `[^ ]'?  Because they are
 # applied to doubly quoted strings, i.e. more or less [[STRING]].  So
 # if there is a leading space in STRING, then it is the *third*