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7172e23e8f
instead of passing a yylexp argument to yypull_parse, and don't generate yypull_parse or yyparse unless %push-pull-parser is declared. Discussed starting at <http://lists.gnu.org/archive/html/bison-patches/2006-12/msg00163.html>. * data/bison.m4 (b4_pull_if): New. * data/c.m4 (b4_identification): Define YYPULL similar to YYPUSH. * data/push.c: Improve M4 quoting a little. (b4_generate_macro_args, b4_parenthesize): Remove. (yyparse): If there's a b4_prefix, #define this to b4_prefix[parse] any time a pull parser is requested. Don't #define this as a wrapper around yypull_parse. Instead, when both push and pull are requested, make it a function that does that same thing. (yypull_parse): If there's a b4_prefix, #define this to b4_prefix[pull_parse] when both push and pull are requested. Don't define this as a function unless both push and pull are requested. Remove the yylexp argument and hard-code yylex invocation instead. * etc/bench.pl.in (bench_grammar): Use %push-pull-parser instead of %push-parser. * src/getargs.c (pull_parser): New global initialized to true. * getargs.h (pull_parser): extern it. * src/output.c (prepare): Insert pull_flag muscle. * src/parse-gram.y (PERCENT_PUSH_PULL_PARSER): New token. (prologue_declaration): Set both push_parser and pull_parser = true for %push-pull-parser. Set push_parser = true and pull_parser = false for %push-parser. * src/scan-gram.l: Don't accept %push_parser as an alternative to %push-parser since there's no backward-compatibility concern here. Scan %push-pull-parser. * tests/calc.at (Simple LALR(1) Calculator): Use %push-pull-parser instead of %push-parser. * tests/headers.at (export YYLTYPE): Make yylex static, and don't prototype it in the module that calls yyparse. * tests/input.at (Torturing the Scanner): Likewise. * tests/local.at (AT_PUSH_IF): Check for %push-pull-parser as well.
197 lines
6.3 KiB
Plaintext
197 lines
6.3 KiB
Plaintext
m4_divert(-1) -*- Autoconf -*-
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# Language-independent M4 Macros for Bison.
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# Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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## ---------------- ##
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## Identification. ##
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## ---------------- ##
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# b4_copyright(TITLE, YEARS)
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# --------------------------
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m4_define([b4_copyright],
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[b4_comment([A Bison parser, made by GNU Bison b4_version.])
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b4_comment([$1
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m4_text_wrap([Copyright (C) $2 Free Software Foundation, Inc.], [ ])
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.])
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b4_comment([As a special exception, you may create a larger work that contains
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part or all of the Bison parser skeleton and distribute that work
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under terms of your choice, so long as that work isn't itself a
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parser generator using the skeleton or a modified version thereof
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as a parser skeleton. Alternatively, if you modify or redistribute
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the parser skeleton itself, you may (at your option) remove this
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special exception, which will cause the skeleton and the resulting
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Bison output files to be licensed under the GNU General Public
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License without this special exception.
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This special exception was added by the Free Software Foundation in
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version 2.2 of Bison.])])
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## ---------------- ##
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## Default values. ##
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## ---------------- ##
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# m4_define_default([b4_lex_param], []) dnl breaks other skeletons
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m4_define_default([b4_epilogue], [])
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m4_define_default([b4_parse_param], [])
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# The initial column and line.
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m4_define_default([b4_location_initial_column], [1])
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m4_define_default([b4_location_initial_line], [1])
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## ------------ ##
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## Data Types. ##
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## ------------ ##
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# b4_ints_in(INT1, INT2, LOW, HIGH)
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# ---------------------------------
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# Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
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m4_define([b4_ints_in],
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[m4_eval([$3 <= $1 && $1 <= $4 && $3 <= $2 && $2 <= $4])])
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## ------------------ ##
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## Decoding options. ##
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## ------------------ ##
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# b4_flag_if(FLAG, IF-TRUE, IF-FALSE)
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# -----------------------------------
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# Run IF-TRUE if b4_FLAG_flag is 1, IF-FALSE if FLAG is 0, otherwise fail.
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m4_define([b4_flag_if],
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[m4_case(b4_$1_flag,
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[0], [$3],
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[1], [$2],
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[m4_fatal([invalid $1 value: ]$1)])])
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# b4_define_flag_if(FLAG)
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# -----------------------
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# Define "b4_FLAG_if(IF-TRUE, IF-FALSE)" that depends on the
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# value of the Boolean FLAG.
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m4_define([b4_define_flag_if],
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[_b4_define_flag_if($[1], $[2], [$1])])
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# _b4_define_flag_if($1, $2, FLAG)
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# --------------------------------
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# This macro works around the impossibility to define macros
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# inside macros, because issuing `[$1]' is not possible in M4 :(.
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# This sucks hard, GNU M4 should really provide M5 like $$1.
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m4_define([_b4_define_flag_if],
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[m4_if([$1$2], $[1]$[2], [],
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[m4_fatal([$0: Invalid arguments: $@])])dnl
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m4_define([b4_$3_if],
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[b4_flag_if([$3], [$1], [$2])])])
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# b4_FLAG_if(IF-TRUE, IF-FALSE)
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# -----------------------------
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# Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
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b4_define_flag_if([defines]) # Whether headers are requested.
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b4_define_flag_if([error_verbose]) # Whether error are verbose.
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b4_define_flag_if([glr]) # Whether a GLR parser is requested.
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b4_define_flag_if([locations]) # Whether locations are tracked.
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b4_define_flag_if([nondeterministic]) # Whether conflicts should be handled.
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b4_define_flag_if([pull]) # Whether pull parsing is requested.
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b4_define_flag_if([pure]) # Whether the interface is pure.
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b4_define_flag_if([push]) # Whether push parsing is requested.
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b4_define_flag_if([yacc]) # Whether POSIX Yacc is emulated.
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## ------------------------- ##
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## Assigning token numbers. ##
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## ------------------------- ##
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## ----------- ##
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## Synclines. ##
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## ----------- ##
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# b4_basename(NAME)
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# -----------------
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# Similar to POSIX basename; the differences don't matter here.
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# Beware that NAME is not evaluated.
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m4_define([b4_basename],
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[m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
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# b4_syncline(LINE, FILE)
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# -----------------------
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m4_define([b4_syncline],
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[b4_flag_if([synclines], [
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b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
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b4_sync_start([$1], [$2])])])
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m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
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m4_define([b4_sync_start], [b4_comment([Line $1 of $2])])
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# b4_user_code(USER-CODE)
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# -----------------------
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# Emit code from the user, ending it with synclines.
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m4_define([b4_user_code],
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[$1
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b4_syncline([@oline@], [@ofile@])])
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# b4_define_user_code(MACRO)
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# --------------------------
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# From b4_MACRO, build b4_user_MACRO that includes the synclines.
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m4_define([b4_define_user_code],
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[m4_define([b4_user_$1],
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[b4_user_code([b4_$1])])])
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# b4_user_actions
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# b4_user_initial_action
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# b4_user_post_prologue
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# b4_user_pre_prologue
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# b4_user_provides
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# b4_user_requires
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# b4_user_stype
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# ----------------------
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# Macros that issue user code, ending with synclines.
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b4_define_user_code([actions])
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b4_define_user_code([initial_action])
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b4_define_user_code([post_prologue])
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b4_define_user_code([pre_prologue])
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b4_define_user_code([provides])
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b4_define_user_code([requires])
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b4_define_user_code([stype])
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