3 # Java language support for Bison
5 # Copyright (C) 2007, 2008 Free Software Foundation, Inc.
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.
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.
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/>.
23 m4_define([b4_comment], [/* m4_bpatsubst([$1], [
28 # b4_list2(LIST1, LIST2)
29 # --------------------------
30 # Join two lists with a comma if necessary.
32 [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
35 # b4_percent_define_get3(DEF, PRE, POST, NOT)
36 # -------------------------------------------
37 # Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
39 m4_define([b4_percent_define_get3],
40 [m4_ifval(m4_quote(b4_percent_define_get([$1])),
41 [$2[]b4_percent_define_get([$1])[]$3], [$4])])
45 # b4_flag_value(BOOLEAN-FLAG)
46 # ---------------------------
47 m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
50 # b4_public_if(TRUE, FALSE)
51 # -------------------------
52 b4_percent_define_default([[public]], [[false]])
53 m4_define([b4_public_if],
54 [b4_percent_define_flag_if([public], [$1], [$2])])
57 # b4_abstract_if(TRUE, FALSE)
58 # ---------------------------
59 b4_percent_define_default([[abstract]], [[false]])
60 m4_define([b4_abstract_if],
61 [b4_percent_define_flag_if([abstract], [$1], [$2])])
64 # b4_final_if(TRUE, FALSE)
65 # ---------------------------
66 b4_percent_define_default([[final]], [[false]])
67 m4_define([b4_final_if],
68 [b4_percent_define_flag_if([final], [$1], [$2])])
71 # b4_strictfp_if(TRUE, FALSE)
72 # ---------------------------
73 b4_percent_define_default([[strictfp]], [[false]])
74 m4_define([b4_strictfp_if],
75 [b4_percent_define_flag_if([strictfp], [$1], [$2])])
78 # b4_lexer_if(TRUE, FALSE)
79 # ------------------------
80 m4_define([b4_lexer_if],
81 [b4_percent_code_ifdef([[lexer]], [$1], [$2])])
86 m4_define([b4_identification],
87 [ /** Version number for the Bison executable that generated this parser. */
88 public static final String bisonVersion = "b4_version";
90 /** Name of the skeleton that generated this parser. */
91 public static final String bisonSkeleton = b4_skeleton;
99 # b4_int_type(MIN, MAX)
100 # ---------------------
101 # Return the smallest int type able to handle numbers ranging from
102 # MIN to MAX (included).
103 m4_define([b4_int_type],
104 [m4_if(b4_ints_in($@, [-128], [127]), [1], [byte],
105 b4_ints_in($@, [-32768], [32767]), [1], [short],
108 # b4_int_type_for(NAME)
109 # ---------------------
110 # Return the smallest int type able to handle numbers ranging from
111 # `NAME_min' to `NAME_max' (included).
112 m4_define([b4_int_type_for],
113 [b4_int_type($1_min, $1_max)])
117 m4_define([b4_null], [null])
120 # b4_typed_parser_table_define(TYPE, NAME, DATA, COMMENT)
121 # -------------------------------------------------------
122 m4_define([b4_typed_parser_table_define],
123 [m4_ifval([$4], [b4_comment([$4])
125 [private static final ]$1[ yy$2_[] = yy$2_init();
126 private static final ]$1[[] yy$2_init()
135 # b4_integral_parser_table_define(NAME, DATA, COMMENT)
136 #-----------------------------------------------------
137 m4_define([b4_integral_parser_table_define],
138 [b4_typed_parser_table_define([b4_int_type_for([$2])], [$1], [$2], [$3])])
141 ## ------------------------- ##
142 ## Assigning token numbers. ##
143 ## ------------------------- ##
145 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
146 # ---------------------------------------
147 # Output the definition of this token as an enum.
148 m4_define([b4_token_enum],
149 [ /** Token number, to be returned by the scanner. */
150 static final int b4_percent_define_get([token.prefix])$1 = $2;
154 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
155 # -----------------------------------------------------
156 # Output the definition of the tokens (if there are) as enums.
157 m4_define([b4_token_enums],
158 [m4_if([$#$1], [1], [],
160 m4_map([b4_token_enum], [$@])])
165 # We need to fool Java's stupid unreachable code detection.
166 m4_define([b4_case], [ case $1:
173 ## ---------------- ##
174 ## Default values. ##
175 ## ---------------- ##
177 m4_define([b4_yystype], [b4_percent_define_get([[stype]])])
178 b4_percent_define_default([[stype]], [[Object]])
181 m4_define_default([b4_prefix], [[YY]])
183 b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])
184 m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])])
186 b4_percent_define_default([[lex_throws]], [[java.io.IOException]])
187 m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])
189 b4_percent_define_default([[throws]], [])
190 m4_define([b4_throws], [b4_percent_define_get([[throws]])])
192 b4_percent_define_default([[init_throws]], [])
193 m4_define([b4_init_throws], [b4_percent_define_get([[init_throws]])])
195 b4_percent_define_default([[location_type]], [Location])
196 m4_define([b4_location_type], [b4_percent_define_get([[location_type]])])
198 b4_percent_define_default([[position_type]], [Position])
199 m4_define([b4_position_type], [b4_percent_define_get([[position_type]])])
202 ## ----------------- ##
203 ## Semantic Values. ##
204 ## ----------------- ##
207 # b4_lhs_value([TYPE])
208 # --------------------
209 # Expansion of $<TYPE>$.
210 m4_define([b4_lhs_value], [yyval])
213 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
214 # --------------------------------------
215 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
218 # In this simple implementation, %token and %type have class names
219 # between the angle brackets.
220 m4_define([b4_rhs_value],
221 [(m4_ifval($3, [($3)])[](yystack.valueAt ($1-($2))))])
226 m4_define([b4_lhs_location],
230 # b4_rhs_location(RULE-LENGTH, NUM)
231 # ---------------------------------
232 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols
234 m4_define([b4_rhs_location],
235 [yystack.locationAt ($1-($2))])
241 # If defined, b4_lex_param arrives double quoted, but below we prefer
242 # it to be single quoted. Same for b4_parse_param.
244 # TODO: should be in bison.m4
245 m4_define_default([b4_lex_param], [[]])
246 m4_define([b4_lex_param], b4_lex_param)
247 m4_define([b4_parse_param], b4_parse_param)
250 # -------------------
251 # Extra formal arguments of the constructor.
252 m4_define([b4_lex_param_decl],
253 [m4_ifset([b4_lex_param],
254 [b4_remove_comma([$1],
255 b4_param_decls(b4_lex_param))],
258 m4_define([b4_param_decls],
259 [m4_map([b4_param_decl], [$@])])
260 m4_define([b4_param_decl], [, $1])
262 m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
266 # b4_parse_param_decl
267 # -------------------
268 # Extra formal arguments of the constructor.
269 m4_define([b4_parse_param_decl],
270 [m4_ifset([b4_parse_param],
271 [b4_remove_comma([$1],
272 b4_param_decls(b4_parse_param))],
278 # -------------------
279 # Delegating the lexer parameters to the lexer constructor.
280 m4_define([b4_lex_param_call],
281 [m4_ifset([b4_lex_param],
282 [b4_remove_comma([$1],
283 b4_param_calls(b4_lex_param))],
285 m4_define([b4_param_calls],
286 [m4_map([b4_param_call], [$@])])
287 m4_define([b4_param_call], [, $2])
291 # b4_parse_param_cons
292 # -------------------
293 # Extra initialisations of the constructor.
294 m4_define([b4_parse_param_cons],
295 [m4_ifset([b4_parse_param],
296 [b4_constructor_calls(b4_parse_param)])])
298 m4_define([b4_constructor_calls],
299 [m4_map([b4_constructor_call], [$@])])
300 m4_define([b4_constructor_call],
306 # b4_parse_param_vars
307 # -------------------
308 # Extra instance variables.
309 m4_define([b4_parse_param_vars],
310 [m4_ifset([b4_parse_param],
312 /* User arguments. */
313 b4_var_decls(b4_parse_param)])])
315 m4_define([b4_var_decls],
316 [m4_map_sep([b4_var_decl], [
318 m4_define([b4_var_decl],
319 [ protected final $1;])
323 # b4_maybe_throws(THROWS)
324 # -----------------------
325 # Expand to either an empty string or "throws THROWS".
326 m4_define([b4_maybe_throws],
327 [m4_ifval($1, [throws $1])])