X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/dfcc5959446a87785cad51a5c5fa7d0cca6b6373..a0cd287e64e2d53bc5896e0a7c5ad072cb8bf469:/data/m4sugar/m4sugar.m4?ds=sidebyside diff --git a/data/m4sugar/m4sugar.m4 b/data/m4sugar/m4sugar.m4 deleted file mode 100644 index 3ac4e00d..00000000 --- a/data/m4sugar/m4sugar.m4 +++ /dev/null @@ -1,1792 +0,0 @@ -divert(-1)# -*- Autoconf -*- -# This file is part of Autoconf. -# Base M4 layer. -# Requires GNU M4. -# -# Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, -# 2008 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 . - -# As a special exception, the Free Software Foundation gives unlimited -# permission to copy, distribute and modify the configure scripts that -# are the output of Autoconf. You need not follow the terms of the GNU -# General Public License when using or distributing such scripts, even -# though portions of the text of Autoconf appear in them. The GNU -# General Public License (GPL) does govern all other use of the material -# that constitutes the Autoconf program. -# -# Certain portions of the Autoconf source text are designed to be copied -# (in certain cases, depending on the input) into the output of -# Autoconf. We call these the "data" portions. The rest of the Autoconf -# source text consists of comments plus executable code that decides which -# of the data portions to output in any given case. We call these -# comments and executable code the "non-data" portions. Autoconf never -# copies any of the non-data portions into its output. -# -# This special exception to the GPL applies to versions of Autoconf -# released by the Free Software Foundation. When you make and -# distribute a modified version of Autoconf, you may extend this special -# exception to the GPL to apply to your modified version as well, *unless* -# your modified version has the potential to copy into its output some -# of the text that was the non-data portion of the version that you started -# with. (In other words, unless your change moves or copies text from -# the non-data portions to the data portions.) If your modification has -# such potential, you must delete any notice of this special exception -# to the GPL from your modified version. -# -# Written by Akim Demaille. -# - -# Set the quotes, whatever the current quoting system. -changequote() -changequote([, ]) - -# Some old m4's don't support m4exit. But they provide -# equivalent functionality by core dumping because of the -# long macros we define. -ifdef([__gnu__], , -[errprint(M4sugar requires GNU M4. Install it before installing M4sugar or -set the M4 environment variable to its absolute file name.) -m4exit(2)]) - - -## ------------------------------- ## -## 1. Simulate --prefix-builtins. ## -## ------------------------------- ## - -# m4_define -# m4_defn -# m4_undefine -define([m4_define], defn([define])) -define([m4_defn], defn([defn])) -define([m4_undefine], defn([undefine])) - -m4_undefine([define]) -m4_undefine([defn]) -m4_undefine([undefine]) - - -# m4_copy(SRC, DST) -# ----------------- -# Define DST as the definition of SRC. -# What's the difference between: -# 1. m4_copy([from], [to]) -# 2. m4_define([to], [from($@)]) -# Well, obviously 1 is more expensive in space. Maybe 2 is more expensive -# in time, but because of the space cost of 1, it's not that obvious. -# Nevertheless, one huge difference is the handling of `$0'. If `from' -# uses `$0', then with 1, `to''s `$0' is `to', while it is `from' in 2. -# The user would certainly prefer to see `to'. -m4_define([m4_copy], -[m4_define([$2], m4_defn([$1]))]) - - -# m4_rename(SRC, DST) -# ------------------- -# Rename the macro SRC to DST. -m4_define([m4_rename], -[m4_copy([$1], [$2])m4_undefine([$1])]) - - -# m4_rename_m4(MACRO-NAME) -# ------------------------ -# Rename MACRO-NAME to m4_MACRO-NAME. -m4_define([m4_rename_m4], -[m4_rename([$1], [m4_$1])]) - - -# m4_copy_unm4(m4_MACRO-NAME) -# --------------------------- -# Copy m4_MACRO-NAME to MACRO-NAME. -m4_define([m4_copy_unm4], -[m4_copy([$1], m4_bpatsubst([$1], [^m4_\(.*\)], [[\1]]))]) - - -# Some m4 internals have names colliding with tokens we might use. -# Rename them a` la `m4 --prefix-builtins'. Conditionals first, since -# some subsequent renames are conditional. -m4_rename_m4([ifdef]) -m4_rename([ifelse], [m4_if]) - -m4_rename_m4([builtin]) -m4_rename_m4([changecom]) -m4_rename_m4([changequote]) -m4_ifdef([changeword],dnl conditionally available in 1.4.x -[m4_undefine([changeword])]) -m4_rename_m4([debugfile]) -m4_rename_m4([debugmode]) -m4_rename_m4([decr]) -m4_undefine([divert]) -m4_rename_m4([divnum]) -m4_rename_m4([dumpdef]) -m4_rename_m4([errprint]) -m4_rename_m4([esyscmd]) -m4_rename_m4([eval]) -m4_rename_m4([format]) -m4_undefine([include]) -m4_rename_m4([incr]) -m4_rename_m4([index]) -m4_rename_m4([indir]) -m4_rename_m4([len]) -m4_rename([m4exit], [m4_exit]) -m4_rename([m4wrap], [m4_wrap]) -m4_ifdef([mkstemp],dnl added in M4 1.4.8 -[m4_rename_m4([mkstemp]) -m4_copy([m4_mkstemp], [m4_maketemp]) -m4_undefine([maketemp])], -[m4_rename_m4([maketemp]) -m4_copy([m4_maketemp], [m4_mkstemp])]) -m4_rename([patsubst], [m4_bpatsubst]) -m4_undefine([popdef]) -m4_rename_m4([pushdef]) -m4_rename([regexp], [m4_bregexp]) -m4_rename_m4([shift]) -m4_undefine([sinclude]) -m4_rename_m4([substr]) -m4_ifdef([symbols],dnl present only in alpha-quality 1.4o -[m4_rename_m4([symbols])]) -m4_rename_m4([syscmd]) -m4_rename_m4([sysval]) -m4_rename_m4([traceoff]) -m4_rename_m4([traceon]) -m4_rename_m4([translit]) -m4_undefine([undivert]) - - -## ------------------- ## -## 2. Error messages. ## -## ------------------- ## - - -# m4_location -# ----------- -m4_define([m4_location], -[__file__:__line__]) - - -# m4_errprintn(MSG) -# ----------------- -# Same as `errprint', but with the missing end of line. -m4_define([m4_errprintn], -[m4_errprint([$1 -])]) - - -# m4_warning(MSG) -# --------------- -# Warn the user. -m4_define([m4_warning], -[m4_errprintn(m4_location[: warning: $1])]) - - -# m4_fatal(MSG, [EXIT-STATUS]) -# ---------------------------- -# Fatal the user. :) -m4_define([m4_fatal], -[m4_errprintn(m4_location[: error: $1])dnl -m4_expansion_stack_dump()dnl -m4_exit(m4_if([$2],, 1, [$2]))]) - - -# m4_assert(EXPRESSION, [EXIT-STATUS = 1]) -# ---------------------------------------- -# This macro ensures that EXPRESSION evaluates to true, and exits if -# EXPRESSION evaluates to false. -m4_define([m4_assert], -[m4_if(m4_eval([$1]), 0, - [m4_fatal([assert failed: $1], [$2])])]) - - - -## ------------- ## -## 3. Warnings. ## -## ------------- ## - - -# _m4_warn(CATEGORY, MESSAGE, STACK-TRACE) -# ---------------------------------------- -# Report a MESSAGE to the user if the CATEGORY of warnings is enabled. -# This is for traces only. -# The STACK-TRACE is a \n-separated list of "LOCATION: MESSAGE". -# -# Within m4, the macro is a no-op. This macro really matters -# when autom4te post-processes the trace output. -m4_define([_m4_warn], []) - - -# m4_warn(CATEGORY, MESSAGE) -# -------------------------- -# Report a MESSAGE to the user if the CATEGORY of warnings is enabled. -m4_define([m4_warn], -[_m4_warn([$1], [$2], -m4_ifdef([m4_expansion_stack], - [m4_defn([m4_expansion_stack]) -m4_location[: the top level]]))dnl -]) - - - -## ------------------- ## -## 4. File inclusion. ## -## ------------------- ## - - -# We also want to neutralize include (and sinclude for symmetry), -# but we want to extend them slightly: warn when a file is included -# several times. This is, in general, a dangerous operation, because -# too many people forget to quote the first argument of m4_define. -# -# For instance in the following case: -# m4_define(foo, [bar]) -# then a second reading will turn into -# m4_define(bar, [bar]) -# which is certainly not what was meant. - -# m4_include_unique(FILE) -# ----------------------- -# Declare that the FILE was loading; and warn if it has already -# been included. -m4_define([m4_include_unique], -[m4_ifdef([m4_include($1)], - [m4_warn([syntax], [file `$1' included several times])])dnl -m4_define([m4_include($1)])]) - - -# m4_include(FILE) -# ---------------- -# Like the builtin include, but warns against multiple inclusions. -m4_define([m4_include], -[m4_include_unique([$1])dnl -m4_builtin([include], [$1])]) - - -# m4_sinclude(FILE) -# ----------------- -# Like the builtin sinclude, but warns against multiple inclusions. -m4_define([m4_sinclude], -[m4_include_unique([$1])dnl -m4_builtin([sinclude], [$1])]) - - - -## ------------------------------------ ## -## 5. Additional branching constructs. ## -## ------------------------------------ ## - -# Both `m4_ifval' and `m4_ifset' tests against the empty string. The -# difference is that `m4_ifset' is specialized on macros. -# -# In case of arguments of macros, eg. $1, it makes little difference. -# In the case of a macro `FOO', you don't want to check `m4_ifval(FOO, -# TRUE)', because if `FOO' expands with commas, there is a shifting of -# the arguments. So you want to run `m4_ifval([FOO])', but then you just -# compare the *string* `FOO' against `', which, of course fails. -# -# So you want the variation `m4_ifset' that expects a macro name as $1. -# If this macro is both defined and defined to a non empty value, then -# it runs TRUE, etc. - - -# m4_ifval(COND, [IF-TRUE], [IF-FALSE]) -# ------------------------------------- -# If COND is not the empty string, expand IF-TRUE, otherwise IF-FALSE. -# Comparable to m4_ifdef. -m4_define([m4_ifval], -[m4_if([$1], [], [$3], [$2])]) - - -# m4_n(TEXT) -# ---------- -# If TEXT is not empty, return TEXT and a new line, otherwise nothing. -m4_define([m4_n], -[m4_if([$1], - [], [], - [$1 -])]) - - -# m4_ifvaln(COND, [IF-TRUE], [IF-FALSE]) -# -------------------------------------- -# Same as `m4_ifval', but add an extra newline to IF-TRUE or IF-FALSE -# unless that argument is empty. -m4_define([m4_ifvaln], -[m4_if([$1], - [], [m4_n([$3])], - [m4_n([$2])])]) - - -# m4_ifset(MACRO, [IF-TRUE], [IF-FALSE]) -# -------------------------------------- -# If MACRO has no definition, or of its definition is the empty string, -# expand IF-FALSE, otherwise IF-TRUE. -m4_define([m4_ifset], -[m4_ifdef([$1], - [m4_ifval(m4_defn([$1]), [$2], [$3])], - [$3])]) - - -# m4_ifndef(NAME, [IF-NOT-DEFINED], [IF-DEFINED]) -# ----------------------------------------------- -m4_define([m4_ifndef], -[m4_ifdef([$1], [$3], [$2])]) - - -# m4_case(SWITCH, VAL1, IF-VAL1, VAL2, IF-VAL2, ..., DEFAULT) -# ----------------------------------------------------------- -# m4 equivalent of -# switch (SWITCH) -# { -# case VAL1: -# IF-VAL1; -# break; -# case VAL2: -# IF-VAL2; -# break; -# ... -# default: -# DEFAULT; -# break; -# }. -# All the values are optional, and the macro is robust to active -# symbols properly quoted. -m4_define([m4_case], -[m4_if([$#], 0, [], - [$#], 1, [], - [$#], 2, [$2], - [$1], [$2], [$3], - [$0([$1], m4_shiftn(3, $@))])]) - - -# m4_bmatch(SWITCH, RE1, VAL1, RE2, VAL2, ..., DEFAULT) -# ----------------------------------------------------- -# m4 equivalent of -# -# if (SWITCH =~ RE1) -# VAL1; -# elif (SWITCH =~ RE2) -# VAL2; -# elif ... -# ... -# else -# DEFAULT -# -# All the values are optional, and the macro is robust to active symbols -# properly quoted. -m4_define([m4_bmatch], -[m4_if([$#], 0, [m4_fatal([$0: too few arguments: $#])], - [$#], 1, [m4_fatal([$0: too few arguments: $#: $1])], - [$#], 2, [$2], - [m4_if(m4_bregexp([$1], [$2]), -1, [$0([$1], m4_shiftn(3, $@))], - [$3])])]) - - -# m4_car(LIST) -# m4_cdr(LIST) -# ------------ -# Manipulate m4 lists. -m4_define([m4_car], [[$1]]) -m4_define([m4_cdr], -[m4_if([$#], 0, [m4_fatal([$0: cannot be called without arguments])], - [$#], 1, [], - [m4_dquote(m4_shift($@))])]) - - -# m4_map(MACRO, LIST) -# ------------------- -# Invoke MACRO($1), MACRO($2) etc. where $1, $2... are the elements -# of LIST (which can be lists themselves, for multiple arguments MACROs). -m4_define([m4_fst], [$1]) -m4_define([m4_map], -[m4_if([$2], [[]], [], - [_m4_map([$1], [$2])])]) -m4_define([_m4_map], -[m4_ifval([$2], - [$1(m4_fst($2))[]_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))[]_m4_map([$2[]$1], m4_cdr($3))])]) - - -## ---------------------------------------- ## -## 6. Enhanced version of some primitives. ## -## ---------------------------------------- ## - -# m4_bpatsubsts(STRING, RE1, SUBST1, RE2, SUBST2, ...) -# ---------------------------------------------------- -# m4 equivalent of -# -# $_ = STRING; -# s/RE1/SUBST1/g; -# s/RE2/SUBST2/g; -# ... -# -# All the values are optional, and the macro is robust to active symbols -# properly quoted. -# -# I would have liked to name this macro `m4_bpatsubst', unfortunately, -# due to quotation problems, I need to double quote $1 below, therefore -# the anchors are broken :( I can't let users be trapped by that. -m4_define([m4_bpatsubsts], -[m4_if([$#], 0, [m4_fatal([$0: too few arguments: $#])], - [$#], 1, [m4_fatal([$0: too few arguments: $#: $1])], - [$#], 2, [m4_builtin([patsubst], $@)], - [$0(m4_builtin([patsubst], [[$1]], [$2], [$3]), - m4_shiftn(3, $@))])]) - - - -# m4_do(STRING, ...) -# ------------------ -# This macro invokes all its arguments (in sequence, of course). It is -# useful for making your macros more structured and readable by dropping -# unnecessary dnl's and have the macros indented properly. -m4_define([m4_do], -[m4_if($#, 0, [], - $#, 1, [$1], - [$1[]m4_do(m4_shift($@))])]) - - -# m4_define_default(MACRO, VALUE) -# ------------------------------- -# If MACRO is undefined, set it to VALUE. -m4_define([m4_define_default], -[m4_ifndef([$1], [m4_define($@)])]) - - -# m4_default(EXP1, EXP2) -# ---------------------- -# Returns EXP1 if non empty, otherwise EXP2. -m4_define([m4_default], -[m4_ifval([$1], [$1], [$2])]) - - -# m4_defn(NAME) -# ------------- -# Unlike to the original, don't tolerate popping something which is -# undefined. -m4_define([m4_defn], -[m4_ifndef([$1], - [m4_fatal([$0: undefined macro: $1])])dnl -m4_builtin([defn], $@)]) - - -# _m4_dumpdefs_up(NAME) -# --------------------- -m4_define([_m4_dumpdefs_up], -[m4_ifdef([$1], - [m4_pushdef([_m4_dumpdefs], m4_defn([$1]))dnl -m4_dumpdef([$1])dnl -m4_popdef([$1])dnl -_m4_dumpdefs_up([$1])])]) - - -# _m4_dumpdefs_down(NAME) -# ----------------------- -m4_define([_m4_dumpdefs_down], -[m4_ifdef([_m4_dumpdefs], - [m4_pushdef([$1], m4_defn([_m4_dumpdefs]))dnl -m4_popdef([_m4_dumpdefs])dnl -_m4_dumpdefs_down([$1])])]) - - -# m4_dumpdefs(NAME) -# ----------------- -# Similar to `m4_dumpdef(NAME)', but if NAME was m4_pushdef'ed, display its -# value stack (most recent displayed first). -m4_define([m4_dumpdefs], -[_m4_dumpdefs_up([$1])dnl -_m4_dumpdefs_down([$1])]) - - -# m4_popdef(NAME) -# --------------- -# Unlike to the original, don't tolerate popping something which is -# undefined. -m4_define([m4_popdef], -[m4_ifndef([$1], - [m4_fatal([$0: undefined macro: $1])])dnl -m4_builtin([popdef], $@)]) - - -# m4_quote(ARGS) -# -------------- -# Return ARGS as a single arguments. -# -# It is important to realize the difference between `m4_quote(exp)' and -# `[exp]': in the first case you obtain the quoted *result* of the -# expansion of EXP, while in the latter you just obtain the string -# `exp'. -m4_define([m4_quote], [[$*]]) -m4_define([m4_dquote], [[$@]]) - - -# m4_noquote(STRING) -# ------------------ -# Return the result of ignoring all quotes in STRING and invoking the -# macros it contains. Amongst other things, this is useful for enabling -# macro invocations inside strings with [] blocks (for instance regexps -# and help-strings). On the other hand, since all quotes are disabled, -# any macro expanded during this time that relies on nested [] quoting -# will likely crash and burn. This macro is seldom useful; consider -# m4_unquote or m4_expand instead. -m4_define([m4_noquote], -[m4_changequote(-=<{,}>=-)$1-=<{}>=-m4_changequote([,])]) - - -# m4_shiftn(N, ...) -# ----------------- -# Returns ... shifted N times. Useful for recursive "varargs" constructs. -m4_define([m4_shiftn], -[m4_assert(($1 >= 0) && ($# > $1))dnl -_m4_shiftn($@)]) - -m4_define([_m4_shiftn], -[m4_if([$1], 0, - [m4_shift($@)], - [_m4_shiftn(m4_eval([$1]-1), m4_shift(m4_shift($@)))])]) - - -# m4_undefine(NAME) -# ----------------- -# Unlike to the original, don't tolerate undefining something which is -# undefined. -m4_define([m4_undefine], -[m4_ifndef([$1], - [m4_fatal([$0: undefined macro: $1])])dnl -m4_builtin([undefine], $@)]) - - -## -------------------------- ## -## 8. Implementing m4 loops. ## -## -------------------------- ## - - -# m4_for(VARIABLE, FIRST, LAST, [STEP = +/-1], EXPRESSION) -# -------------------------------------------------------- -# Expand EXPRESSION defining VARIABLE to FROM, FROM + 1, ..., TO with -# increments of STEP. -# Both limits are included, and bounds are checked for consistency. -m4_define([m4_for], -[m4_case(m4_sign(m4_eval($3 - $2)), - 1, [m4_assert(m4_sign(m4_default($4, 1)) == 1)], - -1, [m4_assert(m4_sign(m4_default($4, -1)) == -1)])dnl -m4_pushdef([$1], [$2])dnl -m4_if(m4_eval([$3 > $2]), 1, - [_m4_for([$1], [$3], m4_default([$4], 1), [$5])], - [_m4_for([$1], [$3], m4_default([$4], -1), [$5])])dnl -m4_popdef([$1])]) - - -# _m4_for(VARIABLE, FIRST, LAST, STEP, EXPRESSION) -# ------------------------------------------------ -# Core of the loop, no consistency checks. -m4_define([_m4_for], -[$4[]dnl -m4_if($1, [$2], [], - [m4_define([$1], m4_eval($1+[$3]))_m4_for([$1], [$2], [$3], [$4])])]) - - -# Implementing `foreach' loops in m4 is much more tricky than it may -# seem. For example, the old M4 1.4.4 manual had an incorrect example, -# which looked like this (when translated to m4sugar): -# -# | # foreach(VAR, (LIST), STMT) -# | m4_define([foreach], -# | [m4_pushdef([$1])_foreach([$1], [$2], [$3])m4_popdef([$1])]) -# | m4_define([_arg1], [$1]) -# | m4_define([_foreach], -# | [m4_if([$2], [()], , -# | [m4_define([$1], _arg1$2)$3[]_foreach([$1], (m4_shift$2), [$3])])]) -# -# But then if you run -# -# | m4_define(a, 1) -# | m4_define(b, 2) -# | m4_define(c, 3) -# | foreach([f], [([a], [(b], [c)])], [echo f -# | ]) -# -# it gives -# -# => echo 1 -# => echo (2,3) -# -# which is not what is expected. -# -# Of course the problem is that many quotes are missing. So you add -# plenty of quotes at random places, until you reach the expected -# result. Alternatively, if you are a quoting wizard, you directly -# reach the following implementation (but if you really did, then -# apply to the maintenance of m4sugar!). -# -# | # foreach(VAR, (LIST), STMT) -# | m4_define([foreach], [m4_pushdef([$1])_foreach($@)m4_popdef([$1])]) -# | m4_define([_arg1], [[$1]]) -# | m4_define([_foreach], -# | [m4_if($2, [()], , -# | [m4_define([$1], [_arg1$2])$3[]_foreach([$1], [(m4_shift$2)], [$3])])]) -# -# which this time answers -# -# => echo a -# => echo (b -# => echo c) -# -# Bingo! -# -# Well, not quite. -# -# With a better look, you realize that the parens are more a pain than -# a help: since anyway you need to quote properly the list, you end up -# with always using an outermost pair of parens and an outermost pair -# of quotes. Rejecting the parens both eases the implementation, and -# simplifies the use: -# -# | # foreach(VAR, (LIST), STMT) -# | m4_define([foreach], [m4_pushdef([$1])_foreach($@)m4_popdef([$1])]) -# | m4_define([_arg1], [$1]) -# | m4_define([_foreach], -# | [m4_if($2, [], , -# | [m4_define([$1], [_arg1($2)])$3[]_foreach([$1], [m4_shift($2)], [$3])])]) -# -# -# Now, just replace the `$2' with `m4_quote($2)' in the outer `m4_if' -# to improve robustness, and you come up with a nice implementation -# that doesn't require extra parentheses in the user's LIST. -# -# But wait - now the algorithm is quadratic, because every recursion of -# the algorithm keeps the entire LIST and merely adds another m4_shift to -# the quoted text. If the user has a lot of elements in LIST, you can -# bring the system to its knees with the memory m4 then requires, or trip -# the m4 --nesting-limit recursion factor. The only way to avoid -# quadratic growth is ensure m4_shift is expanded prior to the recursion. -# Hence the design below. -# -# The M4 manual now includes a chapter devoted to this issue, with -# the lessons learned from m4sugar. - - -# m4_foreach(VARIABLE, LIST, EXPRESSION) -# -------------------------------------- -# -# Expand EXPRESSION assigning each value of the LIST to VARIABLE. -# LIST should have the form `item_1, item_2, ..., item_n', i.e. the -# whole list must *quoted*. Quote members too if you don't want them -# to be expanded. -# -# This macro is robust to active symbols: -# | m4_define(active, [ACT, IVE]) -# | m4_foreach(Var, [active, active], [-Var-]) -# => -ACT--IVE--ACT--IVE- -# -# | m4_foreach(Var, [[active], [active]], [-Var-]) -# => -ACT, IVE--ACT, IVE- -# -# | m4_foreach(Var, [[[active]], [[active]]], [-Var-]) -# => -active--active- -m4_define([m4_foreach], -[m4_pushdef([$1])_m4_foreach($@)m4_popdef([$1])]) - -m4_define([_m4_foreach], -[m4_ifval([$2], - [m4_define([$1], m4_car($2))$3[]dnl -_m4_foreach([$1], m4_cdr($2), [$3])])]) - - -# m4_foreach_w(VARIABLE, LIST, EXPRESSION) -# ---------------------------------------- -# -# Like m4_foreach, but the list is whitespace separated. -# -# This macro is robust to active symbols: -# m4_foreach_w([Var], [ active -# b act\ -# ive ], [-Var-])end -# => -active--b--active-end -# -m4_define([m4_foreach_w], -[m4_foreach([$1], m4_split(m4_normalize([$2])), [$3])]) - - - -## --------------------------- ## -## 9. More diversion support. ## -## --------------------------- ## - - -# _m4_divert(DIVERSION-NAME or NUMBER) -# ------------------------------------ -# If DIVERSION-NAME is the name of a diversion, return its number, -# otherwise if it is a NUMBER return it. -m4_define([_m4_divert], -[m4_ifdef([_m4_divert($1)], - [m4_indir([_m4_divert($1)])], - [$1])]) - -# KILL is only used to suppress output. -m4_define([_m4_divert(KILL)], -1) - - -# _m4_divert_n_stack -# ------------------ -# Print m4_divert_stack with newline prepended, if it's nonempty. -m4_define([_m4_divert_n_stack], -[m4_ifdef([m4_divert_stack], [ -m4_defn([m4_divert_stack])])]) - - -# m4_divert(DIVERSION-NAME) -# ------------------------- -# Change the diversion stream to DIVERSION-NAME. -m4_define([m4_divert], -[m4_define([m4_divert_stack], m4_location[: $0: $1]_m4_divert_n_stack)dnl -m4_builtin([divert], _m4_divert([$1]))dnl -]) - - -# m4_divert_push(DIVERSION-NAME) -# ------------------------------ -# Change the diversion stream to DIVERSION-NAME, while stacking old values. -m4_define([m4_divert_push], -[m4_pushdef([m4_divert_stack], m4_location[: $0: $1]_m4_divert_n_stack)dnl -m4_pushdef([_m4_divert_diversion], [$1])dnl -m4_builtin([divert], _m4_divert([$1]))dnl -]) - - -# m4_divert_pop([DIVERSION-NAME]) -# ------------------------------- -# Change the diversion stream to its previous value, unstacking it. -# If specified, verify we left DIVERSION-NAME. -# When we pop the last value from the stack, we divert to -1. -m4_define([m4_divert_pop], -[m4_ifndef([_m4_divert_diversion], - [m4_fatal([too many m4_divert_pop])])dnl -m4_if([$1], [], [], - [$1], m4_defn([_m4_divert_diversion]), [], - [m4_fatal([$0($1): diversion mismatch: ]_m4_divert_n_stack)])dnl -m4_popdef([m4_divert_stack])dnl -m4_popdef([_m4_divert_diversion])dnl -m4_builtin([divert], - m4_ifdef([_m4_divert_diversion], - [_m4_divert(m4_defn([_m4_divert_diversion]))], - -1))dnl -]) - - -# m4_divert_text(DIVERSION-NAME, CONTENT) -# --------------------------------------- -# Output CONTENT into DIVERSION-NAME (which may be a number actually). -# An end of line is appended for free to CONTENT. -m4_define([m4_divert_text], -[m4_divert_push([$1])dnl -$2 -m4_divert_pop([$1])dnl -]) - - -# m4_divert_once(DIVERSION-NAME, CONTENT) -# --------------------------------------- -# Output CONTENT into DIVERSION-NAME once, if not already there. -# An end of line is appended for free to CONTENT. -m4_define([m4_divert_once], -[m4_expand_once([m4_divert_text([$1], [$2])])]) - - -# m4_undivert(DIVERSION-NAME) -# --------------------------- -# Undivert DIVERSION-NAME. Unlike the M4 version, this only takes a single -# diversion identifier, and should not be used to undivert files. -m4_define([m4_undivert], -[m4_builtin([undivert], _m4_divert([$1]))]) - - -## --------------------------------------------- ## -## 10. Defining macros with bells and whistles. ## -## --------------------------------------------- ## - -# `m4_defun' is basically `m4_define' but it equips the macro with the -# needed machinery for `m4_require'. A macro must be m4_defun'd if -# either it is m4_require'd, or it m4_require's. -# -# Two things deserve attention and are detailed below: -# 1. Implementation of m4_require -# 2. Keeping track of the expansion stack -# -# 1. Implementation of m4_require -# =============================== -# -# Of course m4_defun AC_PROVIDE's the macro, so that a macro which has -# been expanded is not expanded again when m4_require'd, but the -# difficult part is the proper expansion of macros when they are -# m4_require'd. -# -# The implementation is based on two ideas, (i) using diversions to -# prepare the expansion of the macro and its dependencies (by Franc,ois -# Pinard), and (ii) expand the most recently m4_require'd macros _after_ -# the previous macros (by Axel Thimm). -# -# -# The first idea: why use diversions? -# ----------------------------------- -# -# When a macro requires another, the other macro is expanded in new -# diversion, GROW. When the outer macro is fully expanded, we first -# undivert the most nested diversions (GROW - 1...), and finally -# undivert GROW. To understand why we need several diversions, -# consider the following example: -# -# | m4_defun([TEST1], [Test...REQUIRE([TEST2])1]) -# | m4_defun([TEST2], [Test...REQUIRE([TEST3])2]) -# | m4_defun([TEST3], [Test...3]) -# -# Because m4_require is not required to be first in the outer macros, we -# must keep the expansions of the various levels of m4_require separated. -# Right before executing the epilogue of TEST1, we have: -# -# GROW - 2: Test...3 -# GROW - 1: Test...2 -# GROW: Test...1 -# BODY: -# -# Finally the epilogue of TEST1 undiverts GROW - 2, GROW - 1, and -# GROW into the regular flow, BODY. -# -# GROW - 2: -# GROW - 1: -# GROW: -# BODY: Test...3; Test...2; Test...1 -# -# (The semicolons are here for clarification, but of course are not -# emitted.) This is what Autoconf 2.0 (I think) to 2.13 (I'm sure) -# implement. -# -# -# The second idea: first required first out -# ----------------------------------------- -# -# The natural implementation of the idea above is buggy and produces -# very surprising results in some situations. Let's consider the -# following example to explain the bug: -# -# | m4_defun([TEST1], [REQUIRE([TEST2a])REQUIRE([TEST2b])]) -# | m4_defun([TEST2a], []) -# | m4_defun([TEST2b], [REQUIRE([TEST3])]) -# | m4_defun([TEST3], [REQUIRE([TEST2a])]) -# | -# | AC_INIT -# | TEST1 -# -# The dependencies between the macros are: -# -# 3 --- 2b -# / \ is m4_require'd by -# / \ left -------------------- right -# 2a ------------ 1 -# -# If you strictly apply the rules given in the previous section you get: -# -# GROW - 2: TEST3 -# GROW - 1: TEST2a; TEST2b -# GROW: TEST1 -# BODY: -# -# (TEST2a, although required by TEST3 is not expanded in GROW - 3 -# because is has already been expanded before in GROW - 1, so it has -# been AC_PROVIDE'd, so it is not expanded again) so when you undivert -# the stack of diversions, you get: -# -# GROW - 2: -# GROW - 1: -# GROW: -# BODY: TEST3; TEST2a; TEST2b; TEST1 -# -# i.e., TEST2a is expanded after TEST3 although the latter required the -# former. -# -# Starting from 2.50, we use an implementation provided by Axel Thimm. -# The idea is simple: the order in which macros are emitted must be the -# same as the one in which macros are expanded. (The bug above can -# indeed be described as: a macro has been AC_PROVIDE'd before its -# dependent, but it is emitted after: the lack of correlation between -# emission and expansion order is guilty). -# -# How to do that? You keep the stack of diversions to elaborate the -# macros, but each time a macro is fully expanded, emit it immediately. -# -# In the example above, when TEST2a is expanded, but it's epilogue is -# not run yet, you have: -# -# GROW - 2: -# GROW - 1: TEST2a -# GROW: Elaboration of TEST1 -# BODY: -# -# The epilogue of TEST2a emits it immediately: -# -# GROW - 2: -# GROW - 1: -# GROW: Elaboration of TEST1 -# BODY: TEST2a -# -# TEST2b then requires TEST3, so right before the epilogue of TEST3, you -# have: -# -# GROW - 2: TEST3 -# GROW - 1: Elaboration of TEST2b -# GROW: Elaboration of TEST1 -# BODY: TEST2a -# -# The epilogue of TEST3 emits it: -# -# GROW - 2: -# GROW - 1: Elaboration of TEST2b -# GROW: Elaboration of TEST1 -# BODY: TEST2a; TEST3 -# -# TEST2b is now completely expanded, and emitted: -# -# GROW - 2: -# GROW - 1: -# GROW: Elaboration of TEST1 -# BODY: TEST2a; TEST3; TEST2b -# -# and finally, TEST1 is finished and emitted: -# -# GROW - 2: -# GROW - 1: -# GROW: -# BODY: TEST2a; TEST3; TEST2b: TEST1 -# -# The idea is simple, but the implementation is a bit evolved. If you -# are like me, you will want to see the actual functioning of this -# implementation to be convinced. The next section gives the full -# details. -# -# -# The Axel Thimm implementation at work -# ------------------------------------- -# -# We consider the macros above, and this configure.ac: -# -# AC_INIT -# TEST1 -# -# You should keep the definitions of _m4_defun_pro, _m4_defun_epi, and -# m4_require at hand to follow the steps. -# -# This implements tries not to assume that the current diversion is -# BODY, so as soon as a macro (m4_defun'd) is expanded, we first -# record the current diversion under the name _m4_divert_dump (denoted -# DUMP below for short). This introduces an important difference with -# the previous versions of Autoconf: you cannot use m4_require if you -# are not inside an m4_defun'd macro, and especially, you cannot -# m4_require directly from the top level. -# -# We have not tried to simulate the old behavior (better yet, we -# diagnose it), because it is too dangerous: a macro m4_require'd from -# the top level is expanded before the body of `configure', i.e., before -# any other test was run. I let you imagine the result of requiring -# AC_STDC_HEADERS for instance, before AC_PROG_CC was actually run.... -# -# After AC_INIT was run, the current diversion is BODY. -# * AC_INIT was run -# DUMP: undefined -# diversion stack: BODY |- -# -# * TEST1 is expanded -# The prologue of TEST1 sets _m4_divert_dump, which is the diversion -# where the current elaboration will be dumped, to the current -# diversion. It also m4_divert_push to GROW, where the full -# expansion of TEST1 and its dependencies will be elaborated. -# DUMP: BODY -# BODY: empty -# diversions: GROW, BODY |- -# -# * TEST1 requires TEST2a -# _m4_require_call m4_divert_pushes another temporary diversion, -# GROW - 1, and expands TEST2a in there. -# DUMP: BODY -# BODY: empty -# GROW - 1: TEST2a -# diversions: GROW - 1, GROW, BODY |- -# Than the content of the temporary diversion is moved to DUMP and the -# temporary diversion is popped. -# DUMP: BODY -# BODY: TEST2a -# diversions: GROW, BODY |- -# -# * TEST1 requires TEST2b -# Again, _m4_require_call pushes GROW - 1 and heads to expand TEST2b. -# DUMP: BODY -# BODY: TEST2a -# diversions: GROW - 1, GROW, BODY |- -# -# * TEST2b requires TEST3 -# _m4_require_call pushes GROW - 2 and expands TEST3 here. -# (TEST3 requires TEST2a, but TEST2a has already been m4_provide'd, so -# nothing happens.) -# DUMP: BODY -# BODY: TEST2a -# GROW - 2: TEST3 -# diversions: GROW - 2, GROW - 1, GROW, BODY |- -# Than the diversion is appended to DUMP, and popped. -# DUMP: BODY -# BODY: TEST2a; TEST3 -# diversions: GROW - 1, GROW, BODY |- -# -# * TEST1 requires TEST2b (contd.) -# The content of TEST2b is expanded... -# DUMP: BODY -# BODY: TEST2a; TEST3 -# GROW - 1: TEST2b, -# diversions: GROW - 1, GROW, BODY |- -# ... and moved to DUMP. -# DUMP: BODY -# BODY: TEST2a; TEST3; TEST2b -# diversions: GROW, BODY |- -# -# * TEST1 is expanded: epilogue -# TEST1's own content is in GROW... -# DUMP: BODY -# BODY: TEST2a; TEST3; TEST2b -# GROW: TEST1 -# diversions: BODY |- -# ... and it's epilogue moves it to DUMP and then undefines DUMP. -# DUMP: undefined -# BODY: TEST2a; TEST3; TEST2b; TEST1 -# diversions: BODY |- -# -# -# 2. Keeping track of the expansion stack -# ======================================= -# -# When M4 expansion goes wrong it is often extremely hard to find the -# path amongst macros that drove to the failure. What is needed is -# the stack of macro `calls'. One could imagine that GNU M4 would -# maintain a stack of macro expansions, unfortunately it doesn't, so -# we do it by hand. This is of course extremely costly, but the help -# this stack provides is worth it. Nevertheless to limit the -# performance penalty this is implemented only for m4_defun'd macros, -# not for define'd macros. -# -# The scheme is simplistic: each time we enter an m4_defun'd macros, -# we prepend its name in m4_expansion_stack, and when we exit the -# macro, we remove it (thanks to pushdef/popdef). -# -# In addition, we want to detect circular m4_require dependencies. -# Each time we expand a macro FOO we define _m4_expanding(FOO); and -# m4_require(BAR) simply checks whether _m4_expanding(BAR) is defined. - - -# m4_expansion_stack_push(TEXT) -# ----------------------------- -m4_define([m4_expansion_stack_push], -[m4_pushdef([m4_expansion_stack], - [$1]m4_ifdef([m4_expansion_stack], [ -m4_defn([m4_expansion_stack])]))]) - - -# m4_expansion_stack_pop -# ---------------------- -m4_define([m4_expansion_stack_pop], -[m4_popdef([m4_expansion_stack])]) - - -# m4_expansion_stack_dump -# ----------------------- -# Dump the expansion stack. -m4_define([m4_expansion_stack_dump], -[m4_ifdef([m4_expansion_stack], - [m4_errprintn(m4_defn([m4_expansion_stack]))])dnl -m4_errprintn(m4_location[: the top level])]) - - -# _m4_divert(GROW) -# ---------------- -# This diversion is used by the m4_defun/m4_require machinery. It is -# important to keep room before GROW because for each nested -# AC_REQUIRE we use an additional diversion (i.e., two m4_require's -# will use GROW - 2. More than 3 levels has never seemed to be -# needed.) -# -# ... -# - GROW - 2 -# m4_require'd code, 2 level deep -# - GROW - 1 -# m4_require'd code, 1 level deep -# - GROW -# m4_defun'd macros are elaborated here. - -m4_define([_m4_divert(GROW)], 10000) - - -# _m4_defun_pro(MACRO-NAME) -# ------------------------- -# The prologue for Autoconf macros. -m4_define([_m4_defun_pro], -[m4_ifndef([m4_expansion_stack], [_m4_defun_pro_outer[]])dnl -m4_expansion_stack_push(m4_defn([m4_location($1)])[: $1 is expanded from...])dnl -m4_pushdef([_m4_expanding($1)])dnl -]) - -m4_define([_m4_defun_pro_outer], -[m4_copy([_m4_divert_diversion], [_m4_divert_dump])dnl -m4_divert_push([GROW])dnl -]) - -# _m4_defun_epi(MACRO-NAME) -# ------------------------- -# The Epilogue for Autoconf macros. MACRO-NAME only helps tracing -# the PRO/EPI pairs. -m4_define([_m4_defun_epi], -[m4_popdef([_m4_expanding($1)])dnl -m4_expansion_stack_pop()dnl -m4_ifndef([m4_expansion_stack], [_m4_defun_epi_outer[]])dnl -m4_provide([$1])dnl -]) - -m4_define([_m4_defun_epi_outer], -[m4_undefine([_m4_divert_dump])dnl -m4_divert_pop([GROW])dnl -m4_undivert([GROW])dnl -]) - - -# m4_defun(NAME, EXPANSION) -# ------------------------- -# Define a macro which automatically provides itself. Add machinery -# so the macro automatically switches expansion to the diversion -# stack if it is not already using it. In this case, once finished, -# it will bring back all the code accumulated in the diversion stack. -# This, combined with m4_require, achieves the topological ordering of -# macros. We don't use this macro to define some frequently called -# macros that are not involved in ordering constraints, to save m4 -# processing. -m4_define([m4_defun], -[m4_define([m4_location($1)], m4_location)dnl -m4_define([$1], - [_m4_defun_pro([$1])$2[]_m4_defun_epi([$1])])]) - - -# m4_defun_once(NAME, EXPANSION) -# ------------------------------ -# As m4_defun, but issues the EXPANSION only once, and warns if used -# several times. -m4_define([m4_defun_once], -[m4_define([m4_location($1)], m4_location)dnl -m4_define([$1], - [m4_provide_if([$1], - [m4_warn([syntax], [$1 invoked multiple times])], - [_m4_defun_pro([$1])$2[]_m4_defun_epi([$1])])])]) - - -# m4_pattern_forbid(ERE, [WHY]) -# ----------------------------- -# Declare that no token matching the forbidden extended regular -# expression ERE should be seen in the output unless... -m4_define([m4_pattern_forbid], []) - - -# m4_pattern_allow(ERE) -# --------------------- -# ... that token also matches the allowed extended regular expression ERE. -# Both used via traces. -m4_define([m4_pattern_allow], []) - - -## --------------------------------- ## -## 11. Dependencies between macros. ## -## --------------------------------- ## - - -# m4_before(THIS-MACRO-NAME, CALLED-MACRO-NAME) -# --------------------------------------------- -# Issue a warning if CALLED-MACRO-NAME was called before THIS-MACRO-NAME. -m4_define([m4_before], -[m4_provide_if([$2], - [m4_warn([syntax], [$2 was called before $1])])]) - - -# m4_require(NAME-TO-CHECK, [BODY-TO-EXPAND = NAME-TO-CHECK]) -# ----------------------------------------------------------- -# If NAME-TO-CHECK has never been expanded (actually, if it is not -# m4_provide'd), expand BODY-TO-EXPAND *before* the current macro -# expansion. Once expanded, emit it in _m4_divert_dump. Keep track -# of the m4_require chain in m4_expansion_stack. -# -# The normal cases are: -# -# - NAME-TO-CHECK == BODY-TO-EXPAND -# Which you can use for regular macros with or without arguments, e.g., -# m4_require([AC_PROG_CC], [AC_PROG_CC]) -# m4_require([AC_CHECK_HEADERS(limits.h)], [AC_CHECK_HEADERS(limits.h)]) -# which is just the same as -# m4_require([AC_PROG_CC]) -# m4_require([AC_CHECK_HEADERS(limits.h)]) -# -# - BODY-TO-EXPAND == m4_indir([NAME-TO-CHECK]) -# In the case of macros with irregular names. For instance: -# m4_require([AC_LANG_COMPILER(C)], [indir([AC_LANG_COMPILER(C)])]) -# which means `if the macro named `AC_LANG_COMPILER(C)' (the parens are -# part of the name, it is not an argument) has not been run, then -# call it.' -# Had you used -# m4_require([AC_LANG_COMPILER(C)], [AC_LANG_COMPILER(C)]) -# then m4_require would have tried to expand `AC_LANG_COMPILER(C)', i.e., -# call the macro `AC_LANG_COMPILER' with `C' as argument. -# -# You could argue that `AC_LANG_COMPILER', when it receives an argument -# such as `C' should dispatch the call to `AC_LANG_COMPILER(C)'. But this -# `extension' prevents `AC_LANG_COMPILER' from having actual arguments that -# it passes to `AC_LANG_COMPILER(C)'. -m4_define([m4_require], -[m4_ifdef([_m4_expanding($1)], - [m4_fatal([$0: circular dependency of $1])])dnl -m4_ifndef([_m4_divert_dump], - [m4_fatal([$0($1): cannot be used outside of an m4_defun'd macro])])dnl -m4_provide_if([$1], - [], - [_m4_require_call([$1], [$2])])dnl -]) - - -# _m4_require_call(BODY-TO-EXPAND) -# -------------------------------- -# If m4_require decides to expand the body, it calls this macro. -m4_define([_m4_require_call], -[m4_define([_m4_divert_grow], m4_decr(_m4_divert_grow))dnl -m4_divert_push(_m4_divert_grow)dnl -m4_default([$2], [$1]) -m4_provide_if([$1], - [], - [m4_warn([syntax], - [$1 is m4_require'd but not m4_defun'd])])dnl -m4_divert(m4_defn([_m4_divert_dump]))dnl -m4_undivert(_m4_divert_grow)dnl -m4_divert_pop(_m4_divert_grow)dnl -m4_define([_m4_divert_grow], m4_incr(_m4_divert_grow))dnl -]) - - -# _m4_divert_grow -# --------------- -# The counter for _m4_require_call. -m4_define([_m4_divert_grow], _m4_divert([GROW])) - - -# m4_expand_once(TEXT, [WITNESS = TEXT]) -# -------------------------------------- -# If TEXT has never been expanded, expand it *here*. Use WITNESS as -# as a memory that TEXT has already been expanded. -m4_define([m4_expand_once], -[m4_provide_if(m4_ifval([$2], [[$2]], [[$1]]), - [], - [m4_provide(m4_ifval([$2], [[$2]], [[$1]]))[]$1])]) - - -# m4_provide(MACRO-NAME) -# ---------------------- -m4_define([m4_provide], -[m4_define([m4_provide($1)])]) - - -# m4_provide_if(MACRO-NAME, IF-PROVIDED, IF-NOT-PROVIDED) -# ------------------------------------------------------- -# If MACRO-NAME is provided do IF-PROVIDED, else IF-NOT-PROVIDED. -# The purpose of this macro is to provide the user with a means to -# check macros which are provided without letting her know how the -# information is coded. -m4_define([m4_provide_if], -[m4_ifdef([m4_provide($1)], - [$2], [$3])]) - - -## --------------------- ## -## 12. Text processing. ## -## --------------------- ## - - -# m4_cr_letters -# m4_cr_LETTERS -# m4_cr_Letters -# ------------- -m4_define([m4_cr_letters], [abcdefghijklmnopqrstuvwxyz]) -m4_define([m4_cr_LETTERS], [ABCDEFGHIJKLMNOPQRSTUVWXYZ]) -m4_define([m4_cr_Letters], -m4_defn([m4_cr_letters])dnl -m4_defn([m4_cr_LETTERS])dnl -) - - -# m4_cr_digits -# ------------ -m4_define([m4_cr_digits], [0123456789]) - - -# m4_cr_symbols1 & m4_cr_symbols2 -# ------------------------------- -m4_define([m4_cr_symbols1], -m4_defn([m4_cr_Letters])dnl -_) - -m4_define([m4_cr_symbols2], -m4_defn([m4_cr_symbols1])dnl -m4_defn([m4_cr_digits])dnl -) - - -# m4_re_escape(STRING) -# -------------------- -# Escape RE active characters in STRING. -m4_define([m4_re_escape], -[m4_bpatsubst([$1], - [[][*+.?\^$]], [\\\&])]) - - -# m4_re_string -# ------------ -# Regexp for `[a-zA-Z_0-9]*' -# m4_dquote provides literal [] for the character class. -m4_define([m4_re_string], -m4_dquote(m4_defn([m4_cr_symbols2]))dnl -[*]dnl -) - - -# m4_re_word -# ---------- -# Regexp for `[a-zA-Z_][a-zA-Z_0-9]*' -m4_define([m4_re_word], -m4_dquote(m4_defn([m4_cr_symbols1]))dnl -m4_defn([m4_re_string])dnl -) - - -# m4_tolower(STRING) -# m4_toupper(STRING) -# ------------------ -# These macros lowercase and uppercase strings. -m4_define([m4_tolower], -[m4_translit([$1], m4_defn([m4_cr_LETTERS]), m4_defn([m4_cr_letters]))]) -m4_define([m4_toupper], -[m4_translit([$1], m4_defn([m4_cr_letters]), m4_defn([m4_cr_LETTERS]))]) - - -# m4_split(STRING, [REGEXP]) -# -------------------------- -# -# Split STRING into an m4 list of quoted elements. The elements are -# quoted with [ and ]. Beginning spaces and end spaces *are kept*. -# Use m4_strip to remove them. -# -# REGEXP specifies where to split. Default is [\t ]+. -# -# If STRING is empty, the result is an empty list. -# -# Pay attention to the m4_changequotes. When m4 reads the definition of -# m4_split, it still has quotes set to [ and ]. Luckily, these are matched -# in the macro body, so the definition is stored correctly. -# -# Also, notice that $1 is quoted twice, since we want the result to -# be quoted. Then you should understand that the argument of -# patsubst is ``STRING'' (i.e., with additional `` and ''). -# -# This macro is safe on active symbols, i.e.: -# m4_define(active, ACTIVE) -# m4_split([active active ])end -# => [active], [active], []end - -m4_define([m4_split], -[m4_ifval([$1], [_m4_split($@)])]) - -m4_define([_m4_split], -[m4_changequote(``, '')dnl -[dnl Can't use m4_default here instead of m4_if, because m4_default uses -dnl [ and ] as quotes. -m4_bpatsubst(````$1'''', - m4_if(``$2'',, ``[ ]+'', ``$2''), - ``], ['')]dnl -m4_changequote([, ])]) - - - -# m4_flatten(STRING) -# ------------------ -# If STRING contains end of lines, replace them with spaces. If there -# are backslashed end of lines, remove them. This macro is safe with -# active symbols. -# m4_define(active, ACTIVE) -# m4_flatten([active -# act\ -# ive])end -# => active activeend -m4_define([m4_flatten], -[m4_translit(m4_bpatsubst([[[$1]]], [\\ -]), [ -], [ ])]) - - -# m4_strip(STRING) -# ---------------- -# Expands into STRING with tabs and spaces singled out into a single -# space, and removing leading and trailing spaces. -# -# This macro is robust to active symbols. -# m4_define(active, ACTIVE) -# m4_strip([ active active ])end -# => active activeend -# -# Because we want to preserve active symbols, STRING must be double-quoted. -# -# 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* -# character, since there are two leading `['; equally for the last pattern. -m4_define([m4_strip], -[m4_bpatsubsts([[$1]], - [[ ]+], [ ], - [^\(..\) ], [\1], - [ \(..\)$], [\1])]) - - -# m4_normalize(STRING) -# -------------------- -# Apply m4_flatten and m4_strip to STRING. -# -# The argument is quoted, so that the macro is robust to active symbols: -# -# m4_define(active, ACTIVE) -# m4_normalize([ act\ -# ive -# active ])end -# => active activeend - -m4_define([m4_normalize], -[m4_strip(m4_flatten([$1]))]) - - - -# m4_join(SEP, ARG1, ARG2...) -# --------------------------- -# Produce ARG1SEPARG2...SEPARGn. -m4_defun([m4_join], -[m4_case([$#], - [1], [], - [2], [[$2]], - [[$2][$1]$0([$1], m4_shiftn(2, $@))])]) - - - -# m4_append(MACRO-NAME, STRING, [SEPARATOR]) -# ------------------------------------------ -# Redefine MACRO-NAME to hold its former content plus `SEPARATOR`'STRING' -# at the end. It is valid to use this macro with MACRO-NAME undefined, -# in which case no SEPARATOR is added. Be aware that the criterion is -# `not being defined', and not `not being empty'. -# -# This macro is robust to active symbols. It can be used to grow -# strings. -# -# | m4_define(active, ACTIVE) -# | m4_append([sentence], [This is an]) -# | m4_append([sentence], [ active ]) -# | m4_append([sentence], [symbol.]) -# | sentence -# | m4_undefine([active])dnl -# | sentence -# => This is an ACTIVE symbol. -# => This is an active symbol. -# -# It can be used to define hooks. -# -# | m4_define(active, ACTIVE) -# | m4_append([hooks], [m4_define([act1], [act2])]) -# | m4_append([hooks], [m4_define([act2], [active])]) -# | m4_undefine([active]) -# | act1 -# | hooks -# | act1 -# => act1 -# => -# => active -m4_define([m4_append], -[m4_define([$1], - m4_ifdef([$1], [m4_defn([$1])$3])[$2])]) - -# m4_append_uniq(MACRO-NAME, STRING, [SEPARATOR]) -# ----------------------------------------------- -# As `m4_append', but append only if not yet present. -m4_define([m4_append_uniq], -[m4_ifdef([$1], - [m4_bmatch([$3]m4_defn([$1])[$3], m4_re_escape([$3$2$3]), [], - [m4_append($@)])], - [m4_append($@)])]) - - -# m4_text_wrap(STRING, [PREFIX], [FIRST-PREFIX], [WIDTH]) -# ------------------------------------------------------- -# Expands into STRING wrapped to hold in WIDTH columns (default = 79). -# If PREFIX is given, each line is prefixed with it. If FIRST-PREFIX is -# specified, then the first line is prefixed with it. As a special case, -# if the length of FIRST-PREFIX is greater than that of PREFIX, then -# FIRST-PREFIX will be left alone on the first line. -# -# Typical outputs are: -# -# m4_text_wrap([Short string */], [ ], [/* ], 20) -# => /* Short string */ -# -# m4_text_wrap([Much longer string */], [ ], [/* ], 20) -# => /* Much longer -# => string */ -# -# m4_text_wrap([Short doc.], [ ], [ --short ], 30) -# => --short Short doc. -# -# m4_text_wrap([Short doc.], [ ], [ --too-wide ], 30) -# => --too-wide -# => Short doc. -# -# m4_text_wrap([Super long documentation.], [ ], [ --too-wide ], 30) -# => --too-wide -# => Super long -# => documentation. -# -# FIXME: there is no checking of a longer PREFIX than WIDTH, but do -# we really want to bother with people trying each single corner -# of a software? -# -# more important: -# FIXME: handle quadrigraphs correctly, both in TEXT and in FIRST_PREFIX. -# -# This macro does not leave a trailing space behind the last word, -# what complicates it a bit. The algorithm is stupid simple: all the -# words are preceded by m4_Separator which is defined to empty for the -# first word, and then ` ' (single space) for all the others. -m4_define([m4_text_wrap], -[m4_pushdef([m4_Prefix], [$2])dnl -m4_pushdef([m4_Prefix1], m4_default([$3], [m4_Prefix]))dnl -m4_pushdef([m4_Width], m4_default([$4], 79))dnl -m4_pushdef([m4_Cursor], m4_len(m4_Prefix1))dnl -m4_pushdef([m4_Separator], [])dnl -m4_Prefix1[]dnl -m4_if(m4_eval(m4_Cursor > m4_len(m4_Prefix)), - 1, [m4_define([m4_Cursor], m4_len(m4_Prefix)) -m4_Prefix])[]dnl -m4_foreach_w([m4_Word], [$1], -[m4_define([m4_Cursor], m4_eval(m4_Cursor + m4_len(m4_defn([m4_Word])) + 1))dnl -dnl New line if too long, else insert a space unless it is the first -dnl of the words. -m4_if(m4_eval(m4_Cursor > m4_Width), - 1, [m4_define([m4_Cursor], - m4_eval(m4_len(m4_Prefix) + m4_len(m4_defn([m4_Word])) + 1))] -m4_Prefix, - [m4_Separator])[]dnl -m4_defn([m4_Word])[]dnl -m4_define([m4_Separator], [ ])])dnl -m4_popdef([m4_Separator])dnl -m4_popdef([m4_Cursor])dnl -m4_popdef([m4_Width])dnl -m4_popdef([m4_Prefix1])dnl -m4_popdef([m4_Prefix])dnl -]) - - -# m4_text_box(MESSAGE, [FRAME-CHARACTER = `-']) -# --------------------------------------------- -m4_define([m4_text_box], -[@%:@@%:@ m4_bpatsubst([$1], [.], m4_if([$2], [], [[-]], [[$2]])) @%:@@%:@ -@%:@@%:@ $1 @%:@@%:@ -@%:@@%:@ m4_bpatsubst([$1], [.], m4_if([$2], [], [[-]], [[$2]])) @%:@@%:@[]dnl -]) - - -# m4_qlen(STRING) -# --------------- -# Expands to the length of STRING after autom4te converts all quadrigraphs. -m4_define([m4_qlen], -[m4_len(m4_bpatsubsts([[$1]], [@\(<:\|:>\|S|\|%:\)@], [P], [@&t@]))]) - - -# m4_qdelta(STRING) -# ----------------- -# Expands to the net change in the length of STRING from autom4te converting the -# quadrigraphs in STRING. This number is always negative or zero. -m4_define([m4_qdelta], -[m4_eval(m4_qlen([$1]) - m4_len([$1]))]) - - - -## ----------------------- ## -## 13. Number processing. ## -## ----------------------- ## - -# m4_sign(A) -# ---------- -# -# The sign of the integer A. -m4_define([m4_sign], -[m4_bmatch([$1], - [^-], -1, - [^0+], 0, - 1)]) - -# m4_cmp(A, B) -# ------------ -# Compare two integer expressions. -# A < B -> -1 -# A = B -> 0 -# A > B -> 1 -m4_define([m4_cmp], -[m4_sign(m4_eval([$1 - $2]))]) - - -# m4_list_cmp(A, B) -# ----------------- -# -# Compare the two lists of integers A and B. For instance: -# m4_list_cmp((1, 0), (1)) -> 0 -# m4_list_cmp((1, 0), (1, 0)) -> 0 -# m4_list_cmp((1, 2), (1, 0)) -> 1 -# m4_list_cmp((1, 2, 3), (1, 2)) -> 1 -# m4_list_cmp((1, 2, -3), (1, 2)) -> -1 -# m4_list_cmp((1, 0), (1, 2)) -> -1 -# m4_list_cmp((1), (1, 2)) -> -1 -m4_define([m4_list_cmp], -[m4_if([$1$2], [()()], 0, - [$1], [()], [$0((0), [$2])], - [$2], [()], [$0([$1], (0))], - [m4_case(m4_cmp(m4_car$1, m4_car$2), - -1, -1, - 1, 1, - 0, [$0((m4_shift$1), (m4_shift$2))])])]) - - - -## ------------------------ ## -## 14. Version processing. ## -## ------------------------ ## - - -# m4_version_unletter(VERSION) -# ---------------------------- -# Normalize beta version numbers with letters to numbers only for comparison. -# -# Nl -> (N+1).-1.(l#) -# -#i.e., 2.14a -> 2.15.-1.1, 2.14b -> 2.15.-1.2, etc. -# This macro is absolutely not robust to active macro, it expects -# reasonable version numbers and is valid up to `z', no double letters. -m4_define([m4_version_unletter], -[m4_translit(m4_bpatsubsts([$1], - [\([0-9]+\)\([abcdefghi]\)], - [m4_eval(\1 + 1).-1.\2], - [\([0-9]+\)\([jklmnopqrs]\)], - [m4_eval(\1 + 1).-1.1\2], - [\([0-9]+\)\([tuvwxyz]\)], - [m4_eval(\1 + 1).-1.2\2]), - [abcdefghijklmnopqrstuvwxyz], - [12345678901234567890123456])]) - - -# m4_version_compare(VERSION-1, VERSION-2) -# ---------------------------------------- -# Compare the two version numbers and expand into -# -1 if VERSION-1 < VERSION-2 -# 0 if = -# 1 if > -m4_define([m4_version_compare], -[m4_list_cmp((m4_split(m4_version_unletter([$1]), [\.])), - (m4_split(m4_version_unletter([$2]), [\.])))]) - - -# m4_PACKAGE_NAME -# m4_PACKAGE_TARNAME -# m4_PACKAGE_VERSION -# m4_PACKAGE_STRING -# m4_PACKAGE_BUGREPORT -# -------------------- -# If m4sugar/version.m4 is present, then define version strings. This -# file is optional, provided by Autoconf but absent in Bison. -m4_sinclude([m4sugar/version.m4]) - - -# m4_version_prereq(VERSION, [IF-OK], [IF-NOT = FAIL]) -# ---------------------------------------------------- -# Check this Autoconf version against VERSION. -m4_define([m4_version_prereq], -m4_ifdef([m4_PACKAGE_VERSION], -[[m4_if(m4_version_compare(]m4_dquote(m4_defn([m4_PACKAGE_VERSION]))[, [$1]), - [-1], - [m4_default([$3], - [m4_fatal([Autoconf version $1 or higher is required], - [63])])], - [$2])]], -[[m4_fatal([m4sugar/version.m4 not found])]])) - - - -## ------------------- ## -## 15. File handling. ## -## ------------------- ## - - -# It is a real pity that M4 comes with no macros to bind a diversion -# to a file. So we have to deal without, which makes us a lot more -# fragile than we should. - - -# m4_file_append(FILE-NAME, CONTENT) -# ---------------------------------- -m4_define([m4_file_append], -[m4_syscmd([cat >>$1 <<_m4eof -$2 -_m4eof -]) -m4_if(m4_sysval, [0], [], - [m4_fatal([$0: cannot write: $1])])]) - - - -## ------------------------ ## -## 16. Setting M4sugar up. ## -## ------------------------ ## - - -# m4_init -# ------- -# Initialize the m4sugar language. -m4_define([m4_init], -[# All the M4sugar macros start with `m4_', except `dnl' kept as is -# for sake of simplicity. -m4_pattern_forbid([^_?m4_]) -m4_pattern_forbid([^dnl$]) - -# Check the divert push/pop perfect balance. -m4_wrap([m4_ifdef([_m4_divert_diversion], - [m4_fatal([$0: unbalanced m4_divert_push:]_m4_divert_n_stack)])[]]) - -m4_divert_push([KILL]) -m4_wrap([m4_divert_pop([KILL])[]]) -]) diff --git a/data/m4sugar/m4sugar.m4 b/data/m4sugar/m4sugar.m4 new file mode 120000 index 00000000..301feb54 --- /dev/null +++ b/data/m4sugar/m4sugar.m4 @@ -0,0 +1 @@ +../../submodules/autoconf/lib/m4sugar/m4sugar.m4 \ No newline at end of file