data/bison.m4

   1 m4_divert(-1)                                               -*- Autoconf -*-
   2
   3 # Language-independent M4 Macros for Bison.
   4 # Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 # 02110-1301  USA
  20
  21
  22 ## ---------------- ##
  23 ## Identification.  ##
  24 ## ---------------- ##
  25
  26 # b4_copyright(TITLE, YEARS)
  27 # --------------------------
  28 m4_define([b4_copyright],
  29 [b4_comment([A Bison parser, made by GNU Bison b4_version.])
  30
  31 b4_comment([$1
  32
  33 m4_text_wrap([Copyright (C) $2 Free Software Foundation, Inc.], [   ])
  34
  35 This program is free software; you can redistribute it and/or modify
  36 it under the terms of the GNU General Public License as published by
  37 the Free Software Foundation; either version 2, or (at your option)
  38 any later version.
  39
  40 This program is distributed in the hope that it will be useful,
  41 but WITHOUT ANY WARRANTY; without even the implied warranty of
  42 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  43 GNU General Public License for more details.
  44
  45 You should have received a copy of the GNU General Public License
  46 along with this program; if not, write to the Free Software
  47 Foundation, Inc., 51 Franklin Street, Fifth Floor,
  48 Boston, MA 02110-1301, USA.])
  49
  50 b4_comment([As a special exception, you may create a larger work that contains
  51 part or all of the Bison parser skeleton and distribute that work
  52 under terms of your choice, so long as that work isn't itself a
  53 parser generator using the skeleton or a modified version thereof
  54 as a parser skeleton.  Alternatively, if you modify or redistribute
  55 the parser skeleton itself, you may (at your option) remove this
  56 special exception, which will cause the skeleton and the resulting
  57 Bison output files to be licensed under the GNU General Public
  58 License without this special exception.
  59
  60 This special exception was added by the Free Software Foundation in
  61 version 2.2 of Bison.])])
  62
  63
  64 ## ---------------- ##
  65 ## Default values.  ##
  66 ## ---------------- ##
  67
  68 # m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
  69 m4_define_default([b4_epilogue], [])
  70 m4_define_default([b4_parse_param], [])
  71
  72 # The initial column and line.
  73 m4_define_default([b4_location_initial_column], [1])
  74 m4_define_default([b4_location_initial_line],   [1])
  75
  76
  77 ## ------------ ##
  78 ## Data Types.  ##
  79 ## ------------ ##
  80
  81 # b4_ints_in(INT1, INT2, LOW, HIGH)
  82 # ---------------------------------
  83 # Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
  84 m4_define([b4_ints_in],
  85 [m4_eval([$3 <= $1 && $1 <= $4 && $3 <= $2 && $2 <= $4])])
  86
  87
  88
  89 ## ------------------ ##
  90 ## Decoding options.  ##
  91 ## ------------------ ##
  92
  93 # b4_flag_if(FLAG, IF-TRUE, IF-FALSE)
  94 # -----------------------------------
  95 # Run IF-TRUE if b4_FLAG_flag is 1, IF-FALSE if FLAG is 0, otherwise fail.
  96 m4_define([b4_flag_if],
  97 [m4_case(b4_$1_flag,
  98          [0], [$3],
  99          [1], [$2],
 100          [m4_fatal([invalid $1 value: ]$1)])])
 101
 102
 103 # b4_define_flag_if(FLAG)
 104 # -----------------------
 105 # Define "b4_FLAG_if(IF-TRUE, IF-FALSE)" that depends on the
 106 # value of the Boolean FLAG.
 107 m4_define([b4_define_flag_if],
 108 [_b4_define_flag_if($[1], $[2], [$1])])
 109
 110 # _b4_define_flag_if($1, $2, FLAG)
 111 # --------------------------------
 112 # This macro works around the impossibility to define macros
 113 # inside macros, because issuing `[$1]' is not possible in M4 :(.
 114 # This sucks hard, GNU M4 should really provide M5 like $$1.
 115 m4_define([_b4_define_flag_if],
 116 [m4_if([$1$2], $[1]$[2], [],
 117        [m4_fatal([$0: Invalid arguments: $@])])dnl
 118 m4_define([b4_$3_if],
 119           [b4_flag_if([$3], [$1], [$2])])])
 120
 121
 122 # b4_FLAG_if(IF-TRUE, IF-FALSE)
 123 # -----------------------------
 124 # Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
 125 b4_define_flag_if([defines])            # Whether headers are requested.
 126 b4_define_flag_if([error_verbose])      # Whether error are verbose.
 127 b4_define_flag_if([glr])                # Whether a GLR parser is requested.
 128 b4_define_flag_if([locations])          # Whether locations are tracked.
 129 b4_define_flag_if([nondeterministic])   # Whether conflicts should be handled.
 130 b4_define_flag_if([pure])               # Whether the interface is pure.
 131 b4_define_flag_if([push])               # Whether push parsing is supported.
 132 b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
 133
 134
 135 ## ------------------------- ##
 136 ## Assigning token numbers.  ##
 137 ## ------------------------- ##
 138
 139
 140 ## ----------- ##
 141 ## Synclines.  ##
 142 ## ----------- ##
 143
 144 # b4_basename(NAME)
 145 # -----------------
 146 # Similar to POSIX basename; the differences don't matter here.
 147 # Beware that NAME is not evaluated.
 148 m4_define([b4_basename],
 149 [m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
 150
 151
 152 # b4_syncline(LINE, FILE)
 153 # -----------------------
 154 m4_define([b4_syncline],
 155 [b4_flag_if([synclines], [
 156 b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
 157 b4_sync_start([$1], [$2])])])
 158
 159 m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
 160 m4_define([b4_sync_start], [b4_comment([Line $1 of $2])])
 161
 162 # b4_user_code(USER-CODE)
 163 # -----------------------
 164 # Emit code from the user, ending it with synclines.
 165 m4_define([b4_user_code],
 166 [$1
 167 b4_syncline([@oline@], [@ofile@])])
 168
 169
 170 # b4_define_user_code(MACRO)
 171 # --------------------------
 172 # From b4_MACRO, build b4_user_MACRO that includes the synclines.
 173 m4_define([b4_define_user_code],
 174 [m4_define([b4_user_$1],
 175 [b4_user_code([b4_$1])])])
 176
 177
 178 # b4_user_actions
 179 # b4_user_initial_action
 180 # b4_user_post_prologue
 181 # b4_user_start_header
 182 # b4_user_stype
 183 # ----------------------
 184 # Macros that issue user code, ending with synclines.
 185 b4_define_user_code([actions])
 186 b4_define_user_code([initial_action])
 187 b4_define_user_code([post_prologue])
 188 b4_define_user_code([start_header])
 189 b4_define_user_code([stype])
 190
 191