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Support multiple arguments to m4_defn, m4_popdef, and m4_undefine.

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* lib/m4sugar/m4sugar.m4 (m4_defn, m4_popdef, m4_undefine): Loop
through all variables, per POSIX and newer m4.
(_m4_text_wrap): Exploit the looping capabilities.
* tests/m4sugar.at (m4@&t@_defn): Test this.
* NEWS: Document it.
* doc/autoconf.texi (Redefined M4 Macros) <m4_defn, m4_popdef>
<m4_undefine>: Likewise.

Signed-off-by: Eric Blake <ebb9@byu.net>
This commit is contained in:
Eric Blake 2008-07-18 14:26:41 -06:00
parent 8c938c72f0
commit 36d8106f6d
5 changed files with 47 additions and 27 deletions
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9
ChangeLog
View File

@ -1,5 +1,14 @@
2008-07-19 Eric Blake <ebb9@byu.net>
Support multiple arguments to m4_defn, m4_popdef, and m4_undefine.
* lib/m4sugar/m4sugar.m4 (m4_defn, m4_popdef, m4_undefine): Loop
through all variables, per POSIX and newer m4.
(_m4_text_wrap): Exploit the looping capabilities.
* tests/m4sugar.at (m4@&t@_defn): Test this.
* NEWS: Document it.
* doc/autoconf.texi (Redefined M4 Macros) <m4_defn, m4_popdef>
<m4_undefine>: Likewise.
Reduce overhead of m4_builtin([defn]).
* lib/m4sugar/m4sugar.m4 (_m4_defn, _m4_popdef, _m4_undefine): New
internal macros, which are slightly more efficient than

4
NEWS
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@ -22,6 +22,10 @@ GNU Autoconf NEWS - User visible changes.
** The following m4sugar macros are new:
m4_joinall
** The following m4sugar macros now accept multiple arguments, as is the
case with underlying m4:
m4_defn m4_popdef m4_undefine
** AT_KEYWORDS once again performs expansion on its argument, such that
AT_KEYWORDS([m4_if([$1], [], [default])]) no longer complains about
the possibly unexpanded m4_if [regression introduced in 2.62].

29
doc/autoconf.texi
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@ -10323,12 +10323,14 @@ is kept for future versions of M4sugar, once @acronym{GNU} M4 2.0 is
released and supports extended regular expression syntax.
@end defmac
@defmac m4_defn (@var{macro})
@defmac m4_defn (@var{macro}@dots{})
@msindex{defn}
Unlike the M4 builtin, this macro fails if @var{macro} is not
defined. Also, while newer M4 can concatenate multiple definitions,
this version currently only supports a single @var{macro}. See
@code{m4_undefine}.
This macro fails if @var{macro} is not defined, even when using older
versions of M4 that did not warn. See @code{m4_undefine}.
Unfortunately, in order to support these older versions of M4, there are
some situations involving unbalanced quotes where concatenating multiple
macros together will work in newer M4 but not in m4sugar; use
quadrigraphs to work around this.
@end defmac
@defmac m4_divert (@var{diversion})
@ -10380,26 +10382,23 @@ and both have the secure semantics regardless of which macro the
underlying M4 provides.
@end defmac
@defmac m4_popdef (@var{macro})
@defmac m4_popdef (@var{macro}@dots{})
@msindex{popdef}
Unlike the M4 builtin, this macro fails if @var{macro} is not
defined. Also, while newer M4 can pop multiple definitions at once,
this version currently only supports a single @var{macro}. See
@code{m4_undefine}.
This macro fails if @var{macro} is not defined, even when using older
versions of M4 that did not warn. See @code{m4_undefine}.
@end defmac
@defmac m4_undefine (@var{macro})
@defmac m4_undefine (@var{macro}@dots{})
@msindex{undefine}
Unlike the M4 builtin, this macro fails if @var{macro} is not
defined. Also, while newer M4 can undefine multiple definitions at
once, this version currently only supports a single @var{macro}. Use
This macro fails if @var{macro} is not defined, even when using older
versions of M4 that did not warn. Use
@example
m4_ifdef([@var{macro}], [m4_undefine([@var{macro}])])
@end example
@noindent
to recover the behavior of the builtin.
if you are not sure whether @var{macro} is defined.
@end defmac
@defmac m4_undivert (@var{diversion})

20
lib/m4sugar/m4sugar.m4
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@ -506,7 +506,11 @@ m4_define([m4_default],
# m4_defn(NAME)
# -------------
# Like the original, except guarantee a warning when using something which is
# undefined (unlike M4 1.4.x), and only support one argument.
# undefined (unlike M4 1.4.x). This replacement is not a full-featured
# replacement: if any of the defined macros contain unbalanced quoting, but
# when pasted together result in a well-quoted string, then only native m4
# support is able to get it correct. But that's where quadrigraphs come in
# handy, if you really need unbalanced quotes inside your macros.
#
# This macro is called frequently, so minimize the amount of additional
# expansions by skipping m4_ifndef. Better yet, if __m4_version__ exists,
@ -521,7 +525,7 @@ m4_ifdef([__m4_version__], [],
[m4_define([m4_defn],
[m4_ifdef([$1], [],
[m4_fatal([$0: undefined macro: $1])])]dnl
[_m4_defn([$1])])])
[_m4_defn([$1])m4_if([$#], [1], [], [$0(m4_shift($@))])])])
# _m4_dumpdefs_up(NAME)
@ -555,7 +559,7 @@ _m4_dumpdefs_down([$1])])
# m4_popdef(NAME)
# ---------------
# Like the original, except guarantee a warning when using something which is
# undefined (unlike M4 1.4.x), and only support one argument.
# undefined (unlike M4 1.4.x).
#
# This macro is called frequently, so minimize the amount of additional
# expansions by skipping m4_ifndef. Better yet, if __m4_version__ exists,
@ -569,7 +573,7 @@ m4_ifdef([__m4_version__], [],
[m4_define([m4_popdef],
[m4_ifdef([$1], [],
[m4_fatal([$0: undefined macro: $1])])]dnl
[_m4_popdef([$1])])])
[_m4_popdef([$1])m4_if([$#], [1], [], [$0(m4_shift($@))])])])
# m4_shiftn(N, ...)
@ -619,7 +623,7 @@ m4_define([_m4_shift3],
# m4_undefine(NAME)
# -----------------
# Like the original, except guarantee a warning when using something which is
# undefined (unlike M4 1.4.x), and only support one argument.
# undefined (unlike M4 1.4.x).
#
# This macro is called frequently, so minimize the amount of additional
# expansions by skipping m4_ifndef. Better yet, if __m4_version__ exists,
@ -633,7 +637,7 @@ m4_ifdef([__m4_version__], [],
[m4_define([m4_undefine],
[m4_ifdef([$1], [],
[m4_fatal([$0: undefined macro: $1])])]dnl
[_m4_undefine([$1])])])
[_m4_undefine([$1])m4_if([$#], [1], [], [$0(m4_shift($@))])])])
# _m4_wrap(PRE, POST)
# -------------------
@ -2067,9 +2071,7 @@ dnl either way, insert the word
[$2]],
[m4_Separator[]])_m4_defn([m4_Word])])]],
dnl finally, clean up the local variabls
[[_m4_popdef([m4_Separator])]],
[[_m4_popdef([m4_Cursor])]],
[[_m4_popdef([m4_Indent])]]))
[[_m4_popdef([m4_Separator], [m4_Cursor], [m4_Indent])]]))
# m4_text_box(MESSAGE, [FRAME-CHARACTER = `-'])

12
tests/m4sugar.at
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@ -64,24 +64,30 @@ AT_KEYWORDS([m4@&t@_popdef m4@&t@_undefine])
# this is provided by m4 natively or faked by wrappers in m4sugar.
AT_DATA_M4SUGAR([script.4s],
[[m4_defn([oops])
[[m4_define([good])
m4_defn([good], [oops])
]])
AT_CHECK_M4SUGAR([-o-], 1, [], [stderr])
AT_CHECK([grep good stderr], [1])
AT_CHECK([grep 'm4@&t@_defn: undefined.*oops' stderr], [0], [ignore])
AT_DATA_M4SUGAR([script.4s],
[[m4_popdef([oops])
[[m4_define([good])
m4_popdef([good], [oops])
]])
AT_CHECK_M4SUGAR([-o-], 1, [], [stderr])
AT_CHECK([grep good stderr], [1])
AT_CHECK([grep 'm4@&t@_popdef: undefined.*oops' stderr], [0], [ignore])
AT_DATA_M4SUGAR([script.4s],
[[m4_undefine([oops])
[[m4_define([good])
m4_undefine([good], [oops])
]])
AT_CHECK_M4SUGAR([-o-], 1, [], [stderr])
AT_CHECK([grep good stderr], [1])
AT_CHECK([grep 'm4@&t@_undefine: undefined.*oops' stderr], [0], [ignore])
AT_CLEANUP