-*- Autoconf -*- # Java language support for Bison # Copyright (C) 2007 Free Software Foundation, Inc. # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301 USA # b4_comment(TEXT) # ---------------- m4_define([b4_comment], [/* m4_bpatsubst([$1], [ ], [ ]) */]) # b4_flag_value(BOOLEAN-FLAG) # --------------------------- m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])]) # b4_public_if(TRUE, FALSE) # ------------------------- b4_percent_define_default([[public]], [[false]]) m4_define([b4_public_if], [b4_percent_define_flag_if([public], [$1], [$2])]) # b4_single_class_if(TRUE, FALSE) # ------------------------------- b4_percent_define_default([[single_class]], [[false]]) m4_define([b4_single_class_if], [b4_percent_define_flag_if([single_class], [$1], [$2])]) # b4_abstract_if(TRUE, FALSE) # --------------------------- m4_define([b4_abstract_if], [b4_pure_if([$2], [b4_single_class_if([$2], [$1])])]) # b4_identification # ----------------- m4_define([b4_identification], [/** Always true, identifies Bison output. */ public static final boolean bison = true; /** Version number for the Bison executable that generated this parser. */ public static final String bisonVersion = "b4_version"; /** Name of the skeleton that generated this parser. */ public static final String bisonSkeleton = b4_skeleton; ]) ## ------------ ## ## Data types. ## ## ------------ ## # b4_int_type(MIN, MAX) # --------------------- # Return the smallest int type able to handle numbers ranging from # MIN to MAX (included). m4_define([b4_int_type], [m4_if(b4_ints_in($@, [-128], [127]), [1], [byte], b4_ints_in($@, [-32768], [32767]), [1], [short], [int])]) # b4_int_type_for(NAME) # --------------------- # Return the smallest int type able to handle numbers ranging from # `NAME_min' to `NAME_max' (included). m4_define([b4_int_type_for], [b4_int_type($1_min, $1_max)]) # b4_null # ------- m4_define([b4_null], [null]) ## ------------------------- ## ## Assigning token numbers. ## ## ------------------------- ## # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER) # --------------------------------------- # Output the definition of this token as an enum. m4_define([b4_token_enum], [ /** Token number, to be returned by the scanner. */ public static final int $1 = $2; ]) # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER) # ----------------------------------------------------- # Output the definition of the tokens (if there are) as enums. m4_define([b4_token_enums], [m4_if([$@], [[]], [], [/* Tokens. */ m4_map([b4_token_enum], [$@])]) ]) # b4-case(ID, CODE) # ----------------- # We need to fool Java's stupid unreachable code detection. m4_define([b4_case], [ case $1: if (yyn == $1) $2; break; ]) ## ---------------- ## ## Default values. ## ## ---------------- ## m4_define([b4_union_name], [b4_percent_define_get([[union_name]])]) b4_percent_define_default([[union_name]], [[Object]])]) m4_define_default([[b4_prefix]], [[YY]])]) b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])]) m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])]) b4_percent_define_default([[lex_throws]], [[java.io.IOException]])]) m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])]) b4_percent_define_default([[throws]], [b4_lex_throws])]) m4_define([b4_throws], [b4_percent_define_get([[throws]])]) b4_percent_define_default([[location_type]], [Location])]) m4_define([b4_location_type], [b4_percent_define_get([[location_type]])]) b4_percent_define_default([[position_type]], [Position])]) m4_define([b4_position_type], [b4_percent_define_get([[position_type]])]) ## ----------------- ## ## Semantic Values. ## ## ----------------- ## # b4_lhs_value([TYPE]) # -------------------- # Expansion of $$. m4_define([b4_lhs_value], [yyval]) # b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) # -------------------------------------- # Expansion of $NUM, where the current rule has RULE-LENGTH # symbols on RHS. # # In this simple implementation, %token and %type have class names # between the angle brackets. m4_define([b4_rhs_value], [(m4_ifval([$3], [($3)])[](yystack.valueAt ($1-($2))))]) # b4_lhs_location() # ----------------- # Expansion of @$. m4_define([b4_lhs_location], [(yyloc)]) # b4_rhs_location(RULE-LENGTH, NUM) # --------------------------------- # Expansion of @NUM, where the current rule has RULE-LENGTH symbols # on RHS. m4_define([b4_rhs_location], [yystack.locationAt ($1-($2))]) # b4_lex_param # b4_parse_param # -------------- # If defined, b4_lex_param arrives double quoted, but below we prefer # it to be single quoted. Same for b4_parse_param. # TODO: should be in bison.m4 m4_define_default([b4_lex_param], [[]])) m4_define([b4_lex_param], b4_lex_param)) m4_define([b4_parse_param], b4_parse_param)) # b4_lex_param_decl # ------------------- # Extra formal arguments of the constructor. m4_define([b4_lex_param_decl], [m4_ifset([b4_lex_param], [b4_remove_comma([$1], [m4_map([b4_lex_param_decl_1], [b4_lex_param])])], [$1])]) m4_define([b4_lex_param_decl_1], [, $1]) m4_define([b4_remove_comma], [m4_ifval([$1], [$1, ], [])m4_cdr([m4_cdr($@)])]) # b4_lex_param_call # ------------------- # Extra initialisations of the constructor. m4_define([b4_lex_param_call], [m4_ifset([b4_lex_param], [b4_remove_comma([$1], [b4_lex_param_calls(b4_lex_param)])], [$1])]) m4_define([b4_lex_param_calls], [m4_map([b4_lex_param_call_1], [$@])]) m4_define([b4_lex_param_call_1], [, $2]) # b4_parse_param_decl # ------------------- # Extra formal arguments of the constructor. m4_define([b4_parse_param_decl], [m4_ifset([b4_parse_param], [b4_remove_comma([$1], [m4_map([b4_parse_param_decl_1], [b4_parse_param])])], [$1])]) m4_define([b4_parse_param_decl_1], [, $1]) # b4_parse_param_cons # ------------------- # Extra initialisations of the constructor. m4_define([b4_parse_param_cons], [m4_ifset([b4_parse_param], [b4_constructor_calls(b4_parse_param)])]) m4_define([b4_constructor_calls], [m4_map([b4_constructor_call], [$@])]) m4_define([b4_constructor_call], [this.$2 = $2; ]) # b4_parse_param_vars # ------------------- # Extra instance variables. m4_define([b4_parse_param_vars], [m4_ifset([b4_parse_param], [ /* User arguments. */ b4_var_decls(b4_parse_param)])]) m4_define([b4_var_decls], [m4_map_sep([b4_var_decl], [ ], [$@])]) m4_define([b4_var_decl], [ protected final $1;]) # b4_maybe_throws(THROWS) # ----------------------- # Expand to either an empty string or "throws THROWS". m4_define([b4_maybe_throws], [m4_ifval([$1], [throws $1])])