Formatting changes.

[bison.git] / src / parse-gram.y

diff --git a/src/parse-gram.y b/src/parse-gram.y
index df92d6421ed0d48c2271bcb8a9b80355e83a5960..745dbc4e2d899db90732d040b510fd3a8880b81f 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,13 +1,13 @@
 %{/* Bison Grammar Parser                             -*- C -*-
 
-   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation,
-   Inc.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
+   Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   This program is free software; you can redistribute it and/or modify
+   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
+   the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -16,16 +16,11 @@
    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
-*/
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include "system.h"
 
-#include <strverscmp.h>
-
 #include "complain.h"
 #include "conflicts.h"
 #include "files.h"
@@ -153,9 +148,6 @@ static int current_prec = 0;
   PERCENT_OUTPUT          "%output"
   PERCENT_PARSE_PARAM     "%parse-param"
   PERCENT_PURE_PARSER     "%pure-parser"
-  PERCENT_PUSH_PARSER     "%push-parser"
-  PERCENT_PUSH_PULL_PARSER
-                          "%push-pull-parser"
   PERCENT_REQUIRE        "%require"
   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"
@@ -198,12 +190,12 @@ static int current_prec = 0;
 %type <integer> INT
 %printer { fprintf (stderr, "%d", $$); } INT
 
-%type <symbol> id id_colon symbol string_as_id
+%type <symbol> id id_colon symbol symbol.prec string_as_id
 %printer { fprintf (stderr, "%s", $$->tag); } id symbol string_as_id
 %printer { fprintf (stderr, "%s:", $$->tag); } id_colon
 
 %type <assoc> precedence_declarator
-%type <list>  symbols.1 generic_symlist generic_symlist_item
+%type <list>  symbols.1 symbols.prec generic_symlist generic_symlist_item
 %%
 
 input:
@@ -272,9 +264,19 @@ prologue_declaration:
 | "%output" STRING              { spec_outfile = $2; }
 | "%output" "=" STRING          { spec_outfile = $3; }  /* deprecated */
 | "%parse-param" "{...}"       { add_param ("parse_param", $2, @2); }
-| "%pure-parser"                { pure_parser = true; }
-| "%push-parser"                { push_parser = true; pull_parser = false; }
-| "%push-pull-parser"           { push_parser = true; pull_parser = true; }
+| "%pure-parser"
+    {
+      /* %pure-parser is deprecated in favor of `%define api.pure', so use
+         `%define api.pure' in a backward-compatible manner here.  First, don't
+         complain if %pure-parser is specified multiple times.  */
+      if (!muscle_find_const ("percent_define(api.pure)"))
+        muscle_percent_define_insert ("api.pure", @1, "");
+      /* In all cases, use api.pure now so that the backend doesn't complain if
+         the skeleton ignores api.pure, but do warn now if there's a previous
+         conflicting definition from an actual %define.  */
+      if (!muscle_percent_define_flag_if ("api.pure"))
+        muscle_percent_define_insert ("api.pure", @1, "");
+    }
 | "%require" STRING             { version_check (&@2, $2); }
 | "%skeleton" STRING
     {
@@ -301,7 +303,7 @@ prologue_declaration:
       skeleton_arg (skeleton_user, 1, &@1);
     }
 | "%token-table"                { token_table_flag = true; }
-| "%verbose"                    { report_flag = report_states; }
+| "%verbose"                    { report_flag |= report_states; }
 | "%yacc"                       { yacc_flag = true; }
 | /*FIXME: Err?  What is this horror doing here? */ ";"
 ;
@@ -350,9 +352,9 @@ grammar_declaration:
 ;
 
 
-/*----------*
- | %union.  |
- *----------*/
+/*---------.
+| %union.  |
+`---------*/
 
 %token PERCENT_UNION "%union";
 
@@ -395,7 +397,7 @@ symbol_declaration:
 ;
 
 precedence_declaration:
-  precedence_declarator type.opt symbols.1
+  precedence_declarator type.opt symbols.prec
     {
       symbol_list *list;
       ++current_prec;
@@ -420,6 +422,19 @@ type.opt:
 | TYPE           { current_type = $1; tag_seen = true; }
 ;
 
+/* Just like symbols.1 but accept INT for the sake of POSIX.  */
+symbols.prec:
+  symbol.prec
+    { $$ = symbol_list_sym_new ($1, @1); }
+| symbols.prec symbol.prec
+    { $$ = symbol_list_prepend ($1, symbol_list_sym_new ($2, @2)); }
+;
+
+symbol.prec:
+    symbol { $$ = $1; }
+  | symbol INT { $$ = $1; symbol_user_token_number_set ($1, $2, @2); }
+  ;
+
 /* One or more symbols to be %typed. */
 symbols.1:
   symbol
@@ -526,14 +541,14 @@ rhs:
 ;
 
 
-/*----------------------------*
- | variable and content.opt.  |
- *---------------------------*/
+/*---------------------------.
+| variable and content.opt.  |
+`---------------------------*/
 
 variable:
   ID
-  | STRING { $$ = uniqstr_new ($1); } /* deprecated and not M4-friendly */
-  ;
+| STRING { $$ = uniqstr_new ($1); } /* deprecated and not M4-friendly */
+;
 
 /* Some content or empty by default. */
 content.opt:
@@ -545,9 +560,9 @@ content.opt:
 ;
 
 
-/*-------------*
- | braceless.  |
- *-------------*/
+/*------------.
+| braceless.  |
+`------------*/
 
 braceless:
   "{...}"
@@ -562,9 +577,9 @@ braceless:
 ;
 
 
-/*---------------*
- | Identifiers.  |
- *---------------*/
+/*--------------.
+| Identifiers.  |
+`--------------*/
 
 /* Identifiers are returned as uniqstr values by the scanner.
    Depending on their use, we may need to make them genuine symbols.  */