Don't depend on C99 features.

[bison.git] / data / bison.m4

diff --git a/data/bison.m4 b/data/bison.m4
index 4f60e8cc290af2148024b9e2fccd27ab1f179af1..644b66d78999bc857949b9078bb2852077493b64 100644 (file)
--- a/data/bison.m4
+++ b/data/bison.m4
@@ -1,4 +1,4 @@
-m4_divert(-1)                                               -*- Autoconf -*-
+                                                            -*- Autoconf -*-

 
 # Language-independent M4 Macros for Bison.
 # Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
 
 # Language-independent M4 Macros for Bison.
 # Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.


@@ -61,11 +61,102 @@ This special exception was added by the Free Software Foundation in
 version 2.2 of Bison.])])
 
 
 version 2.2 of Bison.])])
 
 

+## ---------------- ##
+## Error handling.  ##
+## ---------------- ##
+
+# b4_error(KIND, FORMAT, [ARG1], [ARG2], ...)
+# -------------------------------------------
+# Write @KIND(FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+m4_define([b4_error],
+[m4_divert_push(0)[@]$1[(]$2[]m4_if([$#], [2], [],
+[m4_foreach([b4_arg],
+            m4_dquote(m4_shift(m4_shift($@))),
+            [[@,]b4_arg])])[@)]m4_divert_pop(0)])
+
+# b4_error_at(KIND, START, END, FORMAT, [ARG1], [ARG2], ...)
+# ----------------------------------------------------------
+# Write @KIND(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+m4_define([b4_error_at],
+[m4_divert_push(0)[@]$1[_at(]$2[@,]$3[@,]$4[]m4_if([$#], [4], [],
+[m4_foreach([b4_arg],
+            m4_dquote(m4_shift(m4_shift(m4_shift(m4_shift($@))))),
+            [[@,]b4_arg])])[@)]m4_divert_pop(0)])
+
+# b4_warn(FORMAT, [ARG1], [ARG2], ...)
+# ------------------------------------
+# Write @warn(FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+#
+# As a simple test suite, this:
+#
+#   m4_define([asdf], [ASDF])
+#   m4_define([fsa], [FSA])
+#   m4_define([fdsa], [FDSA])
+#   b4_warn([[[asdf), asdf]]], [[[fsa), fsa]]], [[[fdsa), fdsa]]])
+#   m4_divert(0)
+#   b4_warn([[asdf), asdf]], [[fsa), fsa]], [[fdsa), fdsa]])
+#   m4_divert(0)
+#   b4_warn([asdf), asdf], [fsa), fsa], [fdsa), fdsa])
+#   m4_divert(0)
+#   b4_warn()
+#   m4_divert(0)
+#   b4_warn(1)
+#   m4_divert(0)
+#   b4_warn(1, 2)
+#
+# Should produce this:
+#
+#   @warn([asdf), asdf]@,[fsa), fsa]@,[fdsa), fdsa]@)
+#   @warn(asdf), asdf@,fsa), fsa@,fdsa), fdsa@)
+#   @warn(ASDF), ASDF@,FSA), FSA@,FDSA), FDSA@)
+#   @warn(@)
+#   @warn(1@)
+#   @warn(1@,2@)
+m4_define([b4_warn],
+[b4_error([[warn]], $@)])
+
+# b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
+# ---------------------------------------------------
+# Write @warn(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+m4_define([b4_warn_at],
+[b4_error_at([[warn]], $@)])
+
+# b4_complain(FORMAT, [ARG1], [ARG2], ...)
+# ----------------------------------------
+# Write @complain(FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+#
+# See the test suite for b4_warn above.
+m4_define([b4_complain],
+[b4_error([[complain]], $@)])
+
+# b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
+# -------------------------------------------------------
+# Write @complain(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+m4_define([b4_complain_at],
+[b4_error_at([[complain]], $@)])
+
+# b4_fatal(FORMAT, [ARG1], [ARG2], ...)
+# -------------------------------------
+# Write @fatal(FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+#
+# See the test suite for b4_warn above.
+m4_define([b4_fatal],
+[b4_error([[fatal]], $@)])
+
+# b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
+# ----------------------------------------------------
+# Write @fatal(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to diversion 0.
+m4_define([b4_fatal_at],
+[b4_error_at([[fatal]], $@)])
+
+

 ## ---------------- ##
 ## Default values.  ##
 ## ---------------- ##
 
 # m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
 ## ---------------- ##
 ## Default values.  ##
 ## ---------------- ##
 
 # m4_define_default([b4_lex_param], [])   dnl breaks other skeletons

+m4_define_default([b4_pre_prologue], [])
+m4_define_default([b4_post_prologue], [])

 m4_define_default([b4_epilogue], [])
 m4_define_default([b4_parse_param], [])
 
 m4_define_default([b4_epilogue], [])
 m4_define_default([b4_parse_param], [])
 


@@ -193,36 +284,176 @@ b4_define_user_code([post_prologue])
 b4_define_user_code([pre_prologue])
 b4_define_user_code([stype])
 
 b4_define_user_code([pre_prologue])
 b4_define_user_code([stype])
 

-# b4_check_percent_code_qualifiers([VAILD_QUALIFIER], [VALID_QUALIFIER], ...)
-# ---------------------------------------------------------------------------
-# Complain if any %code qualifier used in the grammar is not a valid qualifier.
-#
-# b4_used_percent_code_qualifiers must expand to a comma-delimited list of the
-# %code qualifiers used in the grammar.  The list as a whole must be quoted,
-# but individual qualifiers in it must not be.  Qualifiers will not be
-# M4-expanded.  Whitespace will not be stripped from the qualifiers.  Any
-# qualifier that is the empty string will be correctly parsed as such.  If
-# b4_used_percent_code_qualifiers expands to the empty string, then the list
-# contains one qualifier that is the empty string.  If
-# b4_used_percent_code_qualifiers is undefined, then the list contains no
-# qualifiers.  Multiple occurrences of the same qualifier are fine.
-#
-# Each VALID_QUALIFIER will be M4-expanded once to define a valid qualifier.  A
-# VALID_QUALIFIER that expands to the empty string will correctly define the
-# empty string as a valid qualifier.  If b4_used_percent_code_qualifiers is
-# invoked with empty parens, then there is one valid qualifier and it is the
-# empty string.  To specify that there are no valid qualifiers, invoke
-# b4_check_percent_code_qualifiers without parens.  Multiple occurrences of the
-# same valid qualifier are fine.
-#
-# Qualifiers and valid qualifiers must not contain the characters `,' or `&'.
-m4_define([b4_check_percent_code_qualifiers],
-[m4_ifdef([b4_used_percent_code_qualifiers], [
-m4_foreach([b4_qualifier],
-           m4_dquote(m4_substr(m4_split(m4_translit(m4_dquote([,]b4_used_percent_code_qualifiers), [,], [&]), [[&]]), 4)),
-           [m4_if(m4_index(m4_if($#, 0, [], [[,]m4_quote($*)[,]]),
-                           [,]m4_defn([b4_qualifier])[,]),
-                  [-1],
-                  [m4_fatal([`]m4_defn([b4_qualifier])[' is not a recognized %code qualifier.])])
-           ])
+
+# b4_check_user_names(WHAT, USER-LIST, BISON-NAMESPACE)
+# --------------------------------------------------------
+# Warn if any name of type WHAT is used by the user (as recorded in USER-LIST)
+# but is not used by Bison (as recorded by macros in the namespace
+# BISON-NAMESPACE).
+#
+# USER-LIST must expand to a list specifying all grammar occurrences of all
+# names of type WHAT.   Each item in the list must be a triplet specifying one
+# occurrence: name, start boundary, and end boundary.  Empty string names are
+# fine.  An empty list is fine.
+#
+# For example, to define b4_foo_user_names to be used for USER-LIST with three
+# name occurrences and with correct quoting:
+#
+#   m4_define([b4_foo_user_names],
+#             [[[[[[bar]], [[parser.y:1.7]], [[parser.y:1.16]]]],
+#               [[[[bar]], [[parser.y:5.7]], [[parser.y:5.16]]]],
+#               [[[[baz]], [[parser.y:8.7]], [[parser.y:8.16]]]]]])
+#
+# The macro BISON-NAMESPACE(bar) must be defined iff the name bar of type WHAT
+# is used by Bison (in the front-end or in the skeleton).  Empty string names
+# are fine, but it would be ugly for Bison to actually use one.
+#
+# For example, to use b4_foo_bison_names for BISON-NAMESPACE and define that
+# the names bar and baz are used by Bison:
+#
+#   m4_define([b4_foo_bison_names(bar)])
+#   m4_define([b4_foo_bison_names(baz)])
+#
+# To invoke b4_check_user_names with TYPE foo, with USER-LIST
+# b4_foo_user_names, with BISON-NAMESPACE b4_foo_bison_names, and with correct
+# quoting:
+#
+#   b4_check_user_names([[foo]], [b4_foo_user_names],
+#                       [[b4_foo_bison_names]])
+m4_define([b4_check_user_names],
+[m4_foreach([b4_occurrence], $2,
+[m4_pushdef([b4_occurrence], b4_occurrence)dnl
+m4_pushdef([b4_user_name], m4_car(b4_occurrence))dnl
+m4_pushdef([b4_start], m4_car(m4_shift(b4_occurrence)))dnl
+m4_pushdef([b4_end], m4_shift(m4_shift(b4_occurrence)))dnl
+m4_ifndef($3[(]m4_quote(b4_user_name)[)],
+          [b4_warn_at([b4_start], [b4_end],
+                      [[%s `%s' is not used]],
+                      [$1], [b4_user_name])])[]dnl
+m4_popdef([b4_occurrence])dnl
+m4_popdef([b4_user_name])dnl
+m4_popdef([b4_start])dnl
+m4_popdef([b4_end])dnl

 ])])
 ])])

+
+# b4_percent_define_get(VARIABLE)
+# -------------------------------
+# Mimic muscle_percent_define_get in ../src/muscle_tab.h exactly.  That is, if
+# the %define variable VARIABLE is defined, emit its value.  Also, record
+# Bison's usage of VARIABLE by defining
+# b4_percent_define_bison_variables(VARIABLE).
+#
+# For example:
+#
+#   b4_percent_define_get([[foo]])
+m4_define([b4_percent_define_get],
+[m4_define([b4_percent_define_bison_variables(]$1[)])dnl
+m4_ifdef([b4_percent_define(]$1[)], [m4_indir([b4_percent_define(]$1[)])])])
+
+# b4_percent_define_ifdef(VARIABLE, IF-TRUE, [IF-FALSE])
+# ------------------------------------------------------
+# Mimic muscle_percent_define_ifdef in ../src/muscle_tab.h exactly.  That is,
+# if the %define variable VARIABLE is defined, expand IF-TRUE, else expand
+# IF-FALSE.  Also, record Bison's usage of VARIABLE by defining
+# b4_percent_define_bison_variables(VARIABLE).
+#
+# For example:
+#
+#   b4_percent_define_ifdef([[foo]], [[it's defined]], [[it's undefined]])
+m4_define([b4_percent_define_ifdef],
+[m4_ifdef([b4_percent_define(]$1[)],
+         [m4_define([b4_percent_define_bison_variables(]$1[)])$2],
+         [$3])])
+
+# b4_percent_define_flag_if(VARIABLE, IF-TRUE, [IF-FALSE])
+# --------------------------------------------------------
+# Mimic muscle_percent_define_flag_if in ../src/muscle_tab.h exactly.  That is,
+# if the %define variable VARIABLE is defined to "" or "true", expand IF-TRUE.
+# If it is defined to "false", expand IF-FALSE.  Complain if it is undefined
+# (a Bison or skeleton error since the default value should have been set
+# already) or defined to any other value (possibly a user error).  Also, record
+# Bison's usage of VARIABLE by defining
+# b4_percent_define_bison_variables(VARIABLE).
+#
+# For example:
+#
+#   b4_percent_define_flag_if([[foo]], [[it's true]], [[it's false]])
+m4_define([b4_percent_define_flag_if],
+[b4_percent_define_ifdef([$1],
+  [m4_case(b4_percent_define_get([$1]),
+           [], [$2], [true], [$2], [false], [$3],
+           [m4_expand_once([dnl
+             m4_pushdef([b4_loc], m4_indir([b4_percent_define_loc(]$1[)]))dnl
+             b4_complain_at(b4_loc,
+                            [[invalid value for %%define boolean variable `%s']],
+                            [$1])dnl
+             m4_popdef([b4_loc])],
+             [[b4_percent_define_flag_if($1)]])])],
+  [b4_fatal([[undefined %%define variable `%s' passed to b4_percent_define_flag_if]], [$1])])])
+
+# b4_percent_define_default(VARIABLE, DEFAULT)
+# --------------------------------------------
+# Mimic muscle_percent_define_default in ../src/muscle_tab.h exactly.  That is,
+# if the %define variable VARIABLE is undefined, set its value to DEFAULT.
+# Don't record this as a Bison usage of VARIABLE as there's no reason to
+# suspect that the value has yet influenced the output.
+#
+# For example:
+#
+#   b4_percent_define_default([[foo]], [[default value]])
+m4_define([b4_percent_define_default],
+[m4_ifndef([b4_percent_define(]$1[)],
+           [m4_define([b4_percent_define(]$1[)], [$2])dnl
+            m4_define([b4_percent_define_loc(]$1[)],
+                      [[[[[Bison:b4_percent_define_default]:0.0]], [[[Bison:b4_percent_define_default]:0.0]]]])])])
+
+# b4_percent_code_get([QUALIFIER])
+# --------------------------------
+# If any %code blocks for QUALIFIER are defined, emit them beginning with a
+# comment and ending with synclines and a newline.  If QUALIFIER is not
+# specified or empty, do this for the unqualified %code blocks.  Also, record
+# Bison's usage of QUALIFIER (if specified) by defining
+# b4_percent_code_bison_qualifiers(QUALIFIER).
+#
+# For example, to emit any unqualified %code blocks followed by any %code
+# blocks for the qualifier foo:
+#
+#   b4_percent_code_get
+#   b4_percent_code_get([[foo]])
+m4_define([b4_percent_code_get],
+[m4_pushdef([b4_macro_name], [[b4_percent_code(]$1[)]])dnl
+m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])dnl
+m4_ifdef(b4_macro_name,
+[b4_comment([m4_if([$#], [0], [[Unqualified %code]],
+                   [[%code "]$1["]])[ blocks.]])
+b4_user_code([m4_indir(b4_macro_name)])
+])dnl
+m4_popdef([b4_macro_name])])
+
+# b4_percent_code_ifdef(QUALIFIER, IF-TRUE, [IF-FALSE])
+# -----------------------------------------------------
+# If any %code blocks for QUALIFIER (or unqualified %code blocks if
+# QUALIFIER is empty) are defined, expand IF-TRUE, else expand IF-FALSE.
+# Also, record Bison's usage of QUALIFIER (if specified) by defining
+# b4_percent_code_bison_qualifiers(QUALIFIER).
+m4_define([b4_percent_code_ifdef],
+[m4_ifdef([b4_percent_code(]$1[)],
+          [m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])$2],
+         [$3])])
+
+
+## ----------------------------------------------------------- ##
+## After processing the skeletons, check that all the user's   ##
+## %define variables and %code qualifiers were used by Bison.  ##
+## ----------------------------------------------------------- ##
+
+m4_define([b4_check_user_names_wrap],
+[m4_ifdef([b4_percent_]$1[_user_]$2[s],
+          [b4_check_user_names([[%]$1 $2],
+                               [b4_percent_]$1[_user_]$2[s],
+                               [[b4_percent_]$1[_bison_]$2[s]])])])
+
+m4_wrap([
+b4_check_user_names_wrap([[define]], [[variable]])
+b4_check_user_names_wrap([[code]], [[qualifier]])
+])