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1                                                            -*- Autoconf -*-
2
3# Language-independent M4 Macros for Bison.
4
5# Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
6
7# This program is free software: you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation, either version 3 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
19
20
21## ---------------- ##
22## Identification.  ##
23## ---------------- ##
24
25# b4_copyright(TITLE, YEARS)
26# --------------------------
27m4_define([b4_copyright],
28[b4_comment([A Bison parser, made by GNU Bison b4_version.])
29
30b4_comment([$1
31
32m4_text_wrap([Copyright (C) $2 Free Software Foundation, Inc.], [   ])
33
34This program is free software: you can redistribute it and/or modify
35it under the terms of the GNU General Public License as published by
36the Free Software Foundation, either version 3 of the License, or
37(at your option) any later version.
38
39This program is distributed in the hope that it will be useful,
40but WITHOUT ANY WARRANTY; without even the implied warranty of
41MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
42GNU General Public License for more details.
43
44You should have received a copy of the GNU General Public License
45along with this program.  If not, see <http://www.gnu.org/licenses/>.])
46
47b4_comment([As a special exception, you may create a larger work that contains
48part or all of the Bison parser skeleton and distribute that work
49under terms of your choice, so long as that work isn't itself a
50parser generator using the skeleton or a modified version thereof
51as a parser skeleton.  Alternatively, if you modify or redistribute
52the parser skeleton itself, you may (at your option) remove this
53special exception, which will cause the skeleton and the resulting
54Bison output files to be licensed under the GNU General Public
55License without this special exception.
56
57This special exception was added by the Free Software Foundation in
58version 2.2 of Bison.])])
59
60
61## -------- ##
62## Output.  ##
63## -------- ##
64
65# b4_output_begin(FILE)
66# ---------------------
67# Enable output, i.e., send to diversion 0, expand after "#", and
68# generate the tag to output into FILE.  Must be followed by EOL.
69m4_define([b4_output_begin],
70[m4_changecom()
71m4_divert_push(0)dnl
72@output(m4_unquote([$1])@)@dnl
73])
74
75
76# b4_output_end()
77# ---------------
78# Output nothing, restore # as comment character (no expansions after #).
79m4_define([b4_output_end],
80[m4_divert_pop(0)
81m4_changecom([#])
82])
83
84
85## ---------------- ##
86## Error handling.  ##
87## ---------------- ##
88
89# The following error handling macros print error directives that should not
90# become arguments of other macro invocations since they would likely then be
91# mangled.  Thus, they print to stdout directly.
92
93# b4_cat(TEXT)
94# ------------
95# Write TEXT to stdout.  Precede the final newline with an @ so that it's
96# escaped.  For example:
97#
98#   b4_cat([[@complain(invalid input@)]])
99m4_define([b4_cat],
100[m4_syscmd([cat <<'_m4eof'
101]m4_bpatsubst(m4_dquote($1), [_m4eof], [_m4@`eof])[@
102_m4eof
103])dnl
104m4_if(m4_sysval, [0], [], [m4_fatal([$0: cannot write to stdout])])])
105
106# b4_error(KIND, FORMAT, [ARG1], [ARG2], ...)
107# -------------------------------------------
108# Write @KIND(FORMAT@,ARG1@,ARG2@,...@) to stdout.
109#
110# For example:
111#
112#   b4_error([[warn]], [[invalid value for '%s': %s]], [[foo]], [[3]])
113m4_define([b4_error],
114[b4_cat([[@]$1[(]$2[]]dnl
115[m4_if([$#], [2], [],
116       [m4_foreach([b4_arg],
117                   m4_dquote(m4_shift(m4_shift($@))),
118                   [[@,]b4_arg])])[@)]])])
119
120# b4_error_at(KIND, START, END, FORMAT, [ARG1], [ARG2], ...)
121# ----------------------------------------------------------
122# Write @KIND_at(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
123#
124# For example:
125#
126#   b4_error_at([[complain]], [[input.y:2.3]], [[input.y:5.4]],
127#               [[invalid %s]], [[foo]])
128m4_define([b4_error_at],
129[b4_cat([[@]$1[_at(]$2[@,]$3[@,]$4[]]dnl
130[m4_if([$#], [4], [],
131       [m4_foreach([b4_arg],
132                   m4_dquote(m4_shift(m4_shift(m4_shift(m4_shift($@))))),
133                   [[@,]b4_arg])])[@)]])])
134
135# b4_warn(FORMAT, [ARG1], [ARG2], ...)
136# ------------------------------------
137# Write @warn(FORMAT@,ARG1@,ARG2@,...@) to stdout.
138#
139# For example:
140#
141#   b4_warn([[invalid value for '%s': %s]], [[foo]], [[3]])
142#
143# As a simple test suite, this:
144#
145#   m4_divert(-1)
146#   m4_define([asdf], [ASDF])
147#   m4_define([fsa], [FSA])
148#   m4_define([fdsa], [FDSA])
149#   b4_warn([[[asdf), asdf]]], [[[fsa), fsa]]], [[[fdsa), fdsa]]])
150#   b4_warn([[asdf), asdf]], [[fsa), fsa]], [[fdsa), fdsa]])
151#   b4_warn()
152#   b4_warn(1)
153#   b4_warn(1, 2)
154#
155# Should produce this without newlines:
156#
157#   @warn([asdf), asdf]@,[fsa), fsa]@,[fdsa), fdsa]@)
158#   @warn(asdf), asdf@,fsa), fsa@,fdsa), fdsa@)
159#   @warn(@)
160#   @warn(1@)
161#   @warn(1@,2@)
162m4_define([b4_warn],
163[b4_error([[warn]], $@)])
164
165# b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
166# ---------------------------------------------------
167# Write @warn(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
168#
169# For example:
170#
171#   b4_warn_at([[input.y:2.3]], [[input.y:5.4]], [[invalid %s]], [[foo]])
172m4_define([b4_warn_at],
173[b4_error_at([[warn]], $@)])
174
175# b4_complain(FORMAT, [ARG1], [ARG2], ...)
176# ----------------------------------------
177# Write @complain(FORMAT@,ARG1@,ARG2@,...@) to stdout.
178#
179# See b4_warn example.
180m4_define([b4_complain],
181[b4_error([[complain]], $@)])
182
183# b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
184# -------------------------------------------------------
185# Write @complain(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
186#
187# See b4_warn_at example.
188m4_define([b4_complain_at],
189[b4_error_at([[complain]], $@)])
190
191# b4_fatal(FORMAT, [ARG1], [ARG2], ...)
192# -------------------------------------
193# Write @fatal(FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
194#
195# See b4_warn example.
196m4_define([b4_fatal],
197[b4_error([[fatal]], $@)dnl
198m4_exit(1)])
199
200# b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
201# ----------------------------------------------------
202# Write @fatal(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
203#
204# See b4_warn_at example.
205m4_define([b4_fatal_at],
206[b4_error_at([[fatal]], $@)dnl
207m4_exit(1)])
208
209
210## ------------ ##
211## Data Types.  ##
212## ------------ ##
213
214# b4_ints_in(INT1, INT2, LOW, HIGH)
215# ---------------------------------
216# Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
217m4_define([b4_ints_in],
218[m4_eval([$3 <= $1 && $1 <= $4 && $3 <= $2 && $2 <= $4])])
219
220
221
222## ------------------ ##
223## Decoding options.  ##
224## ------------------ ##
225
226# b4_flag_if(FLAG, IF-TRUE, IF-FALSE)
227# -----------------------------------
228# Run IF-TRUE if b4_FLAG_flag is 1, IF-FALSE if FLAG is 0, otherwise fail.
229m4_define([b4_flag_if],
230[m4_case(b4_$1_flag,
231         [0], [$3],
232	 [1], [$2],
233	 [m4_fatal([invalid $1 value: ]$1)])])
234
235
236# b4_define_flag_if(FLAG)
237# -----------------------
238# Define "b4_FLAG_if(IF-TRUE, IF-FALSE)" that depends on the
239# value of the Boolean FLAG.
240m4_define([b4_define_flag_if],
241[_b4_define_flag_if($[1], $[2], [$1])])
242
243# _b4_define_flag_if($1, $2, FLAG)
244# --------------------------------
245# Work around the impossibility to define macros inside macros,
246# because issuing `[$1]' is not possible in M4.  GNU M4 should provide
247# $$1 a la M5/TeX.
248m4_define([_b4_define_flag_if],
249[m4_if([$1$2], $[1]$[2], [],
250       [m4_fatal([$0: Invalid arguments: $@])])dnl
251m4_define([b4_$3_if],
252          [b4_flag_if([$3], [$1], [$2])])])
253
254
255# b4_FLAG_if(IF-TRUE, IF-FALSE)
256# -----------------------------
257# Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
258b4_define_flag_if([defines])            # Whether headers are requested.
259b4_define_flag_if([error_verbose])      # Whether error are verbose.
260b4_define_flag_if([glr])                # Whether a GLR parser is requested.
261b4_define_flag_if([locations])          # Whether locations are tracked.
262b4_define_flag_if([nondeterministic])   # Whether conflicts should be handled.
263b4_define_flag_if([token_table])        # Whether yytoken_table is demanded.
264b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
265
266# yytoken_table is needed to support verbose errors.
267b4_error_verbose_if([m4_define([b4_token_table_flag], [1])])
268
269
270
271## ----------- ##
272## Synclines.  ##
273## ----------- ##
274
275# b4_basename(NAME)
276# -----------------
277# Similar to POSIX basename; the differences don't matter here.
278# Beware that NAME is not evaluated.
279m4_define([b4_basename],
280[m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
281
282
283# b4_syncline(LINE, FILE)
284# -----------------------
285m4_define([b4_syncline],
286[b4_flag_if([synclines],
287[b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
288b4_sync_start([$1], [$2])])])
289
290m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
291m4_define([b4_sync_start], [b4_comment([Line $1 of $2])])
292
293# b4_user_code(USER-CODE)
294# -----------------------
295# Emit code from the user, ending it with synclines.
296m4_define([b4_user_code],
297[$1
298b4_syncline([@oline@], [@ofile@])])
299
300
301# b4_define_user_code(MACRO)
302# --------------------------
303# From b4_MACRO, build b4_user_MACRO that includes the synclines.
304m4_define([b4_define_user_code],
305[m4_define([b4_user_$1],
306[b4_user_code([b4_$1])])])
307
308
309# b4_user_actions
310# b4_user_initial_action
311# b4_user_post_prologue
312# b4_user_pre_prologue
313# b4_user_stype
314# ----------------------
315# Macros that issue user code, ending with synclines.
316b4_define_user_code([actions])
317b4_define_user_code([initial_action])
318b4_define_user_code([post_prologue])
319b4_define_user_code([pre_prologue])
320b4_define_user_code([stype])
321
322
323# b4_check_user_names(WHAT, USER-LIST, BISON-NAMESPACE)
324# -----------------------------------------------------
325# Complain if any name of type WHAT is used by the user (as recorded in
326# USER-LIST) but is not used by Bison (as recorded by macros in the
327# namespace BISON-NAMESPACE).
328#
329# USER-LIST must expand to a list specifying all user occurrences of all names
330# of type WHAT.   Each item in the list must be a triplet specifying one
331# occurrence: name, start boundary, and end boundary.  Empty string names are
332# fine.  An empty list is fine.
333#
334# For example, to define b4_foo_user_names to be used for USER-LIST with three
335# name occurrences and with correct quoting:
336#
337#   m4_define([b4_foo_user_names],
338#             [[[[[[bar]], [[parser.y:1.7]], [[parser.y:1.16]]]],
339#               [[[[bar]], [[parser.y:5.7]], [[parser.y:5.16]]]],
340#               [[[[baz]], [[parser.y:8.7]], [[parser.y:8.16]]]]]])
341#
342# The macro BISON-NAMESPACE(bar) must be defined iff the name bar of type WHAT
343# is used by Bison (in the front-end or in the skeleton).  Empty string names
344# are fine, but it would be ugly for Bison to actually use one.
345#
346# For example, to use b4_foo_bison_names for BISON-NAMESPACE and define that
347# the names bar and baz are used by Bison:
348#
349#   m4_define([b4_foo_bison_names(bar)])
350#   m4_define([b4_foo_bison_names(baz)])
351#
352# To invoke b4_check_user_names with TYPE foo, with USER-LIST
353# b4_foo_user_names, with BISON-NAMESPACE b4_foo_bison_names, and with correct
354# quoting:
355#
356#   b4_check_user_names([[foo]], [b4_foo_user_names],
357#                       [[b4_foo_bison_names]])
358m4_define([b4_check_user_names],
359[m4_foreach([b4_occurrence], $2,
360[m4_pushdef([b4_occurrence], b4_occurrence)dnl
361m4_pushdef([b4_user_name], m4_car(b4_occurrence))dnl
362m4_pushdef([b4_start], m4_car(m4_shift(b4_occurrence)))dnl
363m4_pushdef([b4_end], m4_shift(m4_shift(b4_occurrence)))dnl
364m4_ifndef($3[(]m4_quote(b4_user_name)[)],
365          [b4_complain_at([b4_start], [b4_end],
366                          [[%s '%s' is not used]],
367                          [$1], [b4_user_name])])[]dnl
368m4_popdef([b4_occurrence])dnl
369m4_popdef([b4_user_name])dnl
370m4_popdef([b4_start])dnl
371m4_popdef([b4_end])dnl
372])])
373
374
375
376
377## --------------------- ##
378## b4_percent_define_*.  ##
379## --------------------- ##
380
381
382# b4_percent_define_use(VARIABLE)
383# -------------------------------
384# Declare that VARIABLE was used.
385m4_define([b4_percent_define_use],
386[m4_define([b4_percent_define_bison_variables(]$1[)])dnl
387])
388
389# b4_percent_define_get(VARIABLE, [DEFAULT])
390# ------------------------------------------
391# Mimic muscle_percent_define_get in ../src/muscle-tab.h.  That is, if
392# the %define variable VARIABLE is defined, emit its value.  Contrary
393# to its C counterpart, return DEFAULT otherwise.  Also, record
394# Bison's usage of VARIABLE by defining
395# b4_percent_define_bison_variables(VARIABLE).
396#
397# For example:
398#
399#   b4_percent_define_get([[foo]])
400m4_define([b4_percent_define_get],
401[b4_percent_define_use([$1])dnl
402m4_ifdef([b4_percent_define(]$1[)],
403         [m4_indir([b4_percent_define(]$1[)])],
404         [$2])])
405
406
407# b4_percent_define_get_loc(VARIABLE)
408# -----------------------------------
409# Mimic muscle_percent_define_get_loc in ../src/muscle-tab.h exactly.  That is,
410# if the %define variable VARIABLE is undefined, complain fatally since that's
411# a Bison or skeleton error.  Otherwise, return its definition location in a
412# form approriate for the first two arguments of b4_warn_at, b4_complain_at, or
413# b4_fatal_at.  Don't record this as a Bison usage of VARIABLE as there's no
414# reason to suspect that the user-supplied value has yet influenced the output.
415#
416# For example:
417#
418#   b4_complain_at(b4_percent_define_get_loc([[foo]]), [[invalid foo]])
419m4_define([b4_percent_define_get_loc],
420[m4_ifdef([b4_percent_define_loc(]$1[)],
421          [m4_pushdef([b4_loc], m4_indir([b4_percent_define_loc(]$1[)]))dnl
422b4_loc[]dnl
423m4_popdef([b4_loc])],
424          [b4_fatal([[b4_percent_define_get_loc: undefined %%define variable '%s']], [$1])])])
425
426# b4_percent_define_get_syncline(VARIABLE)
427# ----------------------------------------
428# Mimic muscle_percent_define_get_syncline in ../src/muscle-tab.h exactly.
429# That is, if the %define variable VARIABLE is undefined, complain fatally
430# since that's a Bison or skeleton error.  Otherwise, return its definition
431# location as a b4_syncline invocation.  Don't record this as a Bison usage of
432# VARIABLE as there's no reason to suspect that the user-supplied value has yet
433# influenced the output.
434#
435# For example:
436#
437#   b4_percent_define_get_syncline([[foo]])
438m4_define([b4_percent_define_get_syncline],
439[m4_ifdef([b4_percent_define_syncline(]$1[)],
440          [m4_indir([b4_percent_define_syncline(]$1[)])],
441          [b4_fatal([[b4_percent_define_get_syncline: undefined %%define variable '%s']], [$1])])])
442
443# b4_percent_define_ifdef(VARIABLE, IF-TRUE, [IF-FALSE])
444# ------------------------------------------------------
445# Mimic muscle_percent_define_ifdef in ../src/muscle-tab.h exactly.  That is,
446# if the %define variable VARIABLE is defined, expand IF-TRUE, else expand
447# IF-FALSE.  Also, record Bison's usage of VARIABLE by defining
448# b4_percent_define_bison_variables(VARIABLE).
449#
450# For example:
451#
452#   b4_percent_define_ifdef([[foo]], [[it's defined]], [[it's undefined]])
453m4_define([b4_percent_define_ifdef],
454[m4_ifdef([b4_percent_define(]$1[)],
455	  [m4_define([b4_percent_define_bison_variables(]$1[)])$2],
456	  [$3])])
457
458# b4_percent_define_flag_if(VARIABLE, IF-TRUE, [IF-FALSE])
459# --------------------------------------------------------
460# Mimic muscle_percent_define_flag_if in ../src/muscle-tab.h exactly.  That is,
461# if the %define variable VARIABLE is defined to "" or "true", expand IF-TRUE.
462# If it is defined to "false", expand IF-FALSE.  Complain if it is undefined
463# (a Bison or skeleton error since the default value should have been set
464# already) or defined to any other value (possibly a user error).  Also, record
465# Bison's usage of VARIABLE by defining
466# b4_percent_define_bison_variables(VARIABLE).
467#
468# For example:
469#
470#   b4_percent_define_flag_if([[foo]], [[it's true]], [[it's false]])
471m4_define([b4_percent_define_flag_if],
472[b4_percent_define_ifdef([$1],
473  [m4_case(b4_percent_define_get([$1]),
474           [], [$2], [true], [$2], [false], [$3],
475           [m4_expand_once([b4_complain_at(b4_percent_define_get_loc([$1]),
476                                           [[invalid value for %%define Boolean variable '%s']],
477                                           [$1])],
478                           [[b4_percent_define_flag_if($1)]])])],
479  [b4_fatal([[b4_percent_define_flag_if: undefined %%define variable '%s']], [$1])])])
480
481# b4_percent_define_default(VARIABLE, DEFAULT)
482# --------------------------------------------
483# Mimic muscle_percent_define_default in ../src/muscle-tab.h exactly.  That is,
484# if the %define variable VARIABLE is undefined, set its value to DEFAULT.
485# Don't record this as a Bison usage of VARIABLE as there's no reason to
486# suspect that the value has yet influenced the output.
487#
488# For example:
489#
490#   b4_percent_define_default([[foo]], [[default value]])
491m4_define([b4_percent_define_default],
492[m4_ifndef([b4_percent_define(]$1[)],
493           [m4_define([b4_percent_define(]$1[)], [$2])dnl
494            m4_define([b4_percent_define_loc(]$1[)],
495                      [[[[<skeleton default value>:-1.-1]],
496                        [[<skeleton default value>:-1.-1]]]])dnl
497            m4_define([b4_percent_define_syncline(]$1[)], [[]])])])
498
499# b4_percent_define_check_values(VALUES)
500# --------------------------------------
501# Mimic muscle_percent_define_check_values in ../src/muscle-tab.h exactly
502# except that the VALUES structure is more appropriate for M4.  That is, VALUES
503# is a list of sublists of strings.  For each sublist, the first string is the
504# name of a %define variable, and all remaining strings in that sublist are the
505# valid values for that variable.  Complain if such a variable is undefined (a
506# Bison error since the default value should have been set already) or defined
507# to any other value (possibly a user error).  Don't record this as a Bison
508# usage of the variable as there's no reason to suspect that the value has yet
509# influenced the output.
510#
511# For example:
512#
513#   b4_percent_define_check_values([[[[foo]], [[foo-value1]], [[foo-value2]]]],
514#                                  [[[[bar]], [[bar-value1]]]])
515m4_define([b4_percent_define_check_values],
516[m4_foreach([b4_sublist], m4_quote($@),
517            [_b4_percent_define_check_values(b4_sublist)])])
518
519m4_define([_b4_percent_define_check_values],
520[m4_ifdef([b4_percent_define(]$1[)],
521  [m4_pushdef([b4_good_value], [0])dnl
522   m4_if($#, 1, [],
523         [m4_foreach([b4_value], m4_dquote(m4_shift($@)),
524                     [m4_if(m4_indir([b4_percent_define(]$1[)]), b4_value,
525                            [m4_define([b4_good_value], [1])])])])dnl
526   m4_if(b4_good_value, [0],
527         [b4_complain_at(b4_percent_define_get_loc([$1]),
528                         [[invalid value for %%define variable '%s': '%s']],
529                         [$1],
530                         m4_dquote(m4_indir([b4_percent_define(]$1[)])))
531          m4_foreach([b4_value], m4_dquote(m4_shift($@)),
532                     [b4_complain_at(b4_percent_define_get_loc([$1]),
533                                     [[accepted value: '%s']],
534                                     m4_dquote(b4_value))])])dnl
535   m4_popdef([b4_good_value])],
536  [b4_fatal([[b4_percent_define_check_values: undefined %%define variable '%s']], [$1])])])
537
538# b4_percent_code_get([QUALIFIER])
539# --------------------------------
540# If any %code blocks for QUALIFIER are defined, emit them beginning with a
541# comment and ending with synclines and a newline.  If QUALIFIER is not
542# specified or empty, do this for the unqualified %code blocks.  Also, record
543# Bison's usage of QUALIFIER (if specified) by defining
544# b4_percent_code_bison_qualifiers(QUALIFIER).
545#
546# For example, to emit any unqualified %code blocks followed by any %code
547# blocks for the qualifier foo:
548#
549#   b4_percent_code_get
550#   b4_percent_code_get([[foo]])
551m4_define([b4_percent_code_get],
552[m4_pushdef([b4_macro_name], [[b4_percent_code(]$1[)]])dnl
553m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])dnl
554m4_ifdef(b4_macro_name,
555[b4_comment([m4_if([$#], [0], [[Unqualified %code]],
556                   [["%code ]$1["]])[ blocks.]])
557b4_user_code([m4_indir(b4_macro_name)])
558])dnl
559m4_popdef([b4_macro_name])])
560
561# b4_percent_code_ifdef(QUALIFIER, IF-TRUE, [IF-FALSE])
562# -----------------------------------------------------
563# If any %code blocks for QUALIFIER (or unqualified %code blocks if
564# QUALIFIER is empty) are defined, expand IF-TRUE, else expand IF-FALSE.
565# Also, record Bison's usage of QUALIFIER (if specified) by defining
566# b4_percent_code_bison_qualifiers(QUALIFIER).
567m4_define([b4_percent_code_ifdef],
568[m4_ifdef([b4_percent_code(]$1[)],
569          [m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])$2],
570	  [$3])])
571
572
573## ----------------------------------------------------------- ##
574## After processing the skeletons, check that all the user's   ##
575## %define variables and %code qualifiers were used by Bison.  ##
576## ----------------------------------------------------------- ##
577
578m4_define([b4_check_user_names_wrap],
579[m4_ifdef([b4_percent_]$1[_user_]$2[s],
580          [b4_check_user_names([[%]$1 $2],
581                               [b4_percent_]$1[_user_]$2[s],
582                               [[b4_percent_]$1[_bison_]$2[s]])])])
583
584m4_wrap_lifo([
585b4_check_user_names_wrap([[define]], [[variable]])
586b4_check_user_names_wrap([[code]], [[qualifier]])
587])
588
589
590## ---------------- ##
591## Default values.  ##
592## ---------------- ##
593
594# m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
595m4_define_default([b4_pre_prologue], [])
596m4_define_default([b4_post_prologue], [])
597m4_define_default([b4_epilogue], [])
598m4_define_default([b4_parse_param], [])
599
600# The initial column and line.
601m4_define_default([b4_location_initial_column], [1])
602m4_define_default([b4_location_initial_line],   [1])
603
604# Sanity checks.
605b4_percent_define_ifdef([api.prefix],
606[m4_ifdef([b4_prefix],
607[b4_complain_at(b4_percent_define_get_loc([api.prefix]),
608                [['%s' and '%s' cannot be used together]],
609                [%name-prefix],
610                [%define api.prefix])])])
611