data/java.m4

   1                                                             -*- Autoconf -*-
   2
   3 # Java language support for Bison
   4
   5 # Copyright (C) 2007-2012 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 m4_include(b4_pkgdatadir/[c-like.m4])
  21
  22 # b4_comment(TEXT)
  23 # ----------------
  24 m4_define([b4_comment], [/* m4_bpatsubst([$1], [
  25 ], [
  26    ])  */])
  27
  28
  29 # b4_list2(LIST1, LIST2)
  30 # --------------------------
  31 # Join two lists with a comma if necessary.
  32 m4_define([b4_list2],
  33           [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
  34
  35
  36 # b4_percent_define_get3(DEF, PRE, POST, NOT)
  37 # -------------------------------------------
  38 # Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
  39 # otherwise NOT.
  40 m4_define([b4_percent_define_get3],
  41           [m4_ifval(m4_quote(b4_percent_define_get([$1])),
  42                 [$2[]b4_percent_define_get([$1])[]$3], [$4])])
  43
  44
  45
  46 # b4_flag_value(BOOLEAN-FLAG)
  47 # ---------------------------
  48 m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
  49
  50
  51 # b4_public_if(TRUE, FALSE)
  52 # -------------------------
  53 b4_percent_define_default([[public]], [[false]])
  54 m4_define([b4_public_if],
  55 [b4_percent_define_flag_if([public], [$1], [$2])])
  56
  57
  58 # b4_abstract_if(TRUE, FALSE)
  59 # ---------------------------
  60 b4_percent_define_default([[abstract]], [[false]])
  61 m4_define([b4_abstract_if],
  62 [b4_percent_define_flag_if([abstract], [$1], [$2])])
  63
  64
  65 # b4_final_if(TRUE, FALSE)
  66 # ---------------------------
  67 b4_percent_define_default([[final]], [[false]])
  68 m4_define([b4_final_if],
  69 [b4_percent_define_flag_if([final], [$1], [$2])])
  70
  71
  72 # b4_strictfp_if(TRUE, FALSE)
  73 # ---------------------------
  74 b4_percent_define_default([[strictfp]], [[false]])
  75 m4_define([b4_strictfp_if],
  76 [b4_percent_define_flag_if([strictfp], [$1], [$2])])
  77
  78
  79 # b4_lexer_if(TRUE, FALSE)
  80 # ------------------------
  81 m4_define([b4_lexer_if],
  82 [b4_percent_code_ifdef([[lexer]], [$1], [$2])])
  83
  84
  85 # b4_identification
  86 # -----------------
  87 m4_define([b4_identification],
  88 [  /** Version number for the Bison executable that generated this parser.  */
  89   public static final String bisonVersion = "b4_version";
  90
  91   /** Name of the skeleton that generated this parser.  */
  92   public static final String bisonSkeleton = b4_skeleton;
  93 ])
  94
  95
  96 ## ------------ ##
  97 ## Data types.  ##
  98 ## ------------ ##
  99
 100 # b4_int_type(MIN, MAX)
 101 # ---------------------
 102 # Return the smallest int type able to handle numbers ranging from
 103 # MIN to MAX (included).
 104 m4_define([b4_int_type],
 105 [m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
 106        b4_ints_in($@, [-32768], [32767]), [1], [short],
 107                                                [int])])
 108
 109 # b4_int_type_for(NAME)
 110 # ---------------------
 111 # Return the smallest int type able to handle numbers ranging from
 112 # `NAME_min' to `NAME_max' (included).
 113 m4_define([b4_int_type_for],
 114 [b4_int_type($1_min, $1_max)])
 115
 116 # b4_null
 117 # -------
 118 m4_define([b4_null], [null])
 119
 120
 121 ## ------------------------- ##
 122 ## Assigning token numbers.  ##
 123 ## ------------------------- ##
 124
 125 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
 126 # ---------------------------------------
 127 # Output the definition of this token as an enum.
 128 m4_define([b4_token_enum],
 129 [  /** Token number, to be returned by the scanner.  */
 130   public static final int $1 = $2;
 131 ])
 132
 133
 134 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 135 # -----------------------------------------------------
 136 # Output the definition of the tokens (if there are) as enums.
 137 m4_define([b4_token_enums],
 138 [m4_if([$#$1], [1], [],
 139 [/* Tokens.  */
 140 m4_map([b4_token_enum], [$@])])
 141 ])
 142
 143 # b4-case(ID, CODE)
 144 # -----------------
 145 # We need to fool Java's stupid unreachable code detection.
 146 m4_define([b4_case], [  case $1:
 147   if (yyn == $1)
 148     $2;
 149   break;
 150     ])
 151
 152
 153 ## ---------------- ##
 154 ## Default values.  ##
 155 ## ---------------- ##
 156
 157 m4_define([b4_yystype], [b4_percent_define_get([[stype]])])
 158 b4_percent_define_default([[stype]], [[Object]])])
 159
 160 # %name-prefix
 161 m4_define_default([b4_prefix], [[YY]])
 162
 163 b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])])
 164 m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])])
 165
 166 b4_percent_define_default([[lex_throws]], [[java.io.IOException]])])
 167 m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])
 168
 169 b4_percent_define_default([[throws]], [])])
 170 m4_define([b4_throws], [b4_percent_define_get([[throws]])])
 171
 172 b4_percent_define_default([[location_type]], [Location])])
 173 m4_define([b4_location_type], [b4_percent_define_get([[location_type]])])
 174
 175 b4_percent_define_default([[position_type]], [Position])])
 176 m4_define([b4_position_type], [b4_percent_define_get([[position_type]])])
 177
 178
 179 ## ----------------- ##
 180 ## Semantic Values.  ##
 181 ## ----------------- ##
 182
 183
 184 # b4_lhs_value([TYPE])
 185 # --------------------
 186 # Expansion of $<TYPE>$.
 187 m4_define([b4_lhs_value], [yyval])
 188
 189
 190 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
 191 # --------------------------------------
 192 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
 193 # symbols on RHS.
 194 #
 195 # In this simple implementation, %token and %type have class names
 196 # between the angle brackets.
 197 m4_define([b4_rhs_value],
 198 [(m4_ifval($3, [($3)])[](yystack.valueAt ($1-($2))))])
 199
 200 # b4_lhs_location()
 201 # -----------------
 202 # Expansion of @$.
 203 m4_define([b4_lhs_location],
 204 [(yyloc)])
 205
 206
 207 # b4_rhs_location(RULE-LENGTH, NUM)
 208 # ---------------------------------
 209 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols
 210 # on RHS.
 211 m4_define([b4_rhs_location],
 212 [yystack.locationAt ($1-($2))])
 213
 214
 215 # b4_lex_param
 216 # b4_parse_param
 217 # --------------
 218 # If defined, b4_lex_param arrives double quoted, but below we prefer
 219 # it to be single quoted.  Same for b4_parse_param.
 220
 221 # TODO: should be in bison.m4
 222 m4_define_default([b4_lex_param], [[]]))
 223 m4_define([b4_lex_param], b4_lex_param))
 224 m4_define([b4_parse_param], b4_parse_param))
 225
 226 # b4_lex_param_decl
 227 # -------------------
 228 # Extra formal arguments of the constructor.
 229 m4_define([b4_lex_param_decl],
 230 [m4_ifset([b4_lex_param],
 231           [b4_remove_comma([$1],
 232                            b4_param_decls(b4_lex_param))],
 233           [$1])])
 234
 235 m4_define([b4_param_decls],
 236           [m4_map([b4_param_decl], [$@])])
 237 m4_define([b4_param_decl], [, $1])
 238
 239 m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
 240
 241
 242
 243 # b4_parse_param_decl
 244 # -------------------
 245 # Extra formal arguments of the constructor.
 246 m4_define([b4_parse_param_decl],
 247 [m4_ifset([b4_parse_param],
 248           [b4_remove_comma([$1],
 249                            b4_param_decls(b4_parse_param))],
 250           [$1])])
 251
 252
 253
 254 # b4_lex_param_call
 255 # -------------------
 256 # Delegating the lexer parameters to the lexer constructor.
 257 m4_define([b4_lex_param_call],
 258           [m4_ifset([b4_lex_param],
 259                     [b4_remove_comma([$1],
 260                                      b4_param_calls(b4_lex_param))],
 261                     [$1])])
 262 m4_define([b4_param_calls],
 263           [m4_map([b4_param_call], [$@])])
 264 m4_define([b4_param_call], [, $2])
 265
 266
 267
 268 # b4_parse_param_cons
 269 # -------------------
 270 # Extra initialisations of the constructor.
 271 m4_define([b4_parse_param_cons],
 272           [m4_ifset([b4_parse_param],
 273                     [b4_constructor_calls(b4_parse_param)])])
 274
 275 m4_define([b4_constructor_calls],
 276           [m4_map([b4_constructor_call], [$@])])
 277 m4_define([b4_constructor_call],
 278           [this.$2 = $2;
 279           ])
 280
 281
 282
 283 # b4_parse_param_vars
 284 # -------------------
 285 # Extra instance variables.
 286 m4_define([b4_parse_param_vars],
 287           [m4_ifset([b4_parse_param],
 288                     [
 289     /* User arguments.  */
 290 b4_var_decls(b4_parse_param)])])
 291
 292 m4_define([b4_var_decls],
 293           [m4_map_sep([b4_var_decl], [
 294 ], [$@])])
 295 m4_define([b4_var_decl],
 296           [    protected final $1;])
 297
 298
 299
 300 # b4_maybe_throws(THROWS)
 301 # -----------------------
 302 # Expand to either an empty string or "throws THROWS".
 303 m4_define([b4_maybe_throws],
 304           [m4_ifval($1, [throws $1])])