xml: beware of user strings used to give a %prec to rules.

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

diff --git a/src/parse-gram.y b/src/parse-gram.y
index cada04f7687adf9f8a1188ae32e05d3a3069cd45..8718a6d39a79f136bd19e2aeb313ff9fa808e19a 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,6 +1,6 @@
 %{/* Bison Grammar Parser                             -*- C -*-
 
 %{/* Bison Grammar Parser                             -*- C -*-
 

-   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software

    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.


@@ -26,7 +26,7 @@
 #include "files.h"
 #include "getargs.h"
 #include "gram.h"
 #include "files.h"
 #include "getargs.h"
 #include "gram.h"

-#include "muscle_tab.h"
+#include "muscle-tab.h"

 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"
 #include "quotearg.h"
 #include "reader.h"
 #include "symlist.h"


@@ -128,19 +128,17 @@ static int current_prec = 0;
 
 %token
   PERCENT_CODE            "%code"
 
 %token
   PERCENT_CODE            "%code"

-  PERCENT_DEBUG           "%debug"

   PERCENT_DEFAULT_PREC    "%default-prec"
   PERCENT_DEFINE          "%define"
   PERCENT_DEFINES         "%defines"
   PERCENT_DEFAULT_PREC    "%default-prec"
   PERCENT_DEFINE          "%define"
   PERCENT_DEFINES         "%defines"

-  PERCENT_ERROR_VERBOSE   "%error-verbose"

   PERCENT_EXPECT          "%expect"
   PERCENT_EXPECT_RR      "%expect-rr"
   PERCENT_EXPECT          "%expect"
   PERCENT_EXPECT_RR      "%expect-rr"

+  PERCENT_FLAG            "%<flag>"

   PERCENT_FILE_PREFIX     "%file-prefix"
   PERCENT_GLR_PARSER      "%glr-parser"
   PERCENT_INITIAL_ACTION  "%initial-action"
   PERCENT_LANGUAGE        "%language"
   PERCENT_LEX_PARAM       "%lex-param"
   PERCENT_FILE_PREFIX     "%file-prefix"
   PERCENT_GLR_PARSER      "%glr-parser"
   PERCENT_INITIAL_ACTION  "%initial-action"
   PERCENT_LANGUAGE        "%language"
   PERCENT_LEX_PARAM       "%lex-param"

-  PERCENT_LOCATIONS       "%locations"

   PERCENT_NAME_PREFIX     "%name-prefix"
   PERCENT_NO_DEFAULT_PREC "%no-default-prec"
   PERCENT_NO_LINES        "%no-lines"
   PERCENT_NAME_PREFIX     "%name-prefix"
   PERCENT_NO_DEFAULT_PREC "%no-default-prec"
   PERCENT_NO_LINES        "%no-lines"


@@ -148,7 +146,6 @@ static int current_prec = 0;
                          "%nondeterministic-parser"
   PERCENT_OUTPUT          "%output"
   PERCENT_PARSE_PARAM     "%parse-param"
                          "%nondeterministic-parser"
   PERCENT_OUTPUT          "%output"
   PERCENT_PARSE_PARAM     "%parse-param"

-  PERCENT_PURE_PARSER     "%pure-parser"

   PERCENT_REQUIRE        "%require"
   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"
   PERCENT_REQUIRE        "%require"
   PERCENT_SKELETON        "%skeleton"
   PERCENT_START           "%start"


@@ -183,10 +180,11 @@ static int current_prec = 0;
 %printer { fprintf (stderr, "{\n%s\n}", $$); }
         braceless content.opt "{...}" "%{...%}" EPILOGUE
 
 %printer { fprintf (stderr, "{\n%s\n}", $$); }
         braceless content.opt "{...}" "%{...%}" EPILOGUE
 

-%type <uniqstr> TAG ID ID_COLON variable
-%printer { fprintf (stderr, "<%s>", $$); } TAG
+%type <uniqstr> TAG ID ID_COLON PERCENT_FLAG variable

 %printer { fputs ($$, stderr); } ID variable
 %printer { fprintf (stderr, "%s:", $$); } ID_COLON
 %printer { fputs ($$, stderr); } ID variable
 %printer { fprintf (stderr, "%s:", $$); } ID_COLON

+%printer { fprintf (stderr, "%%%s", $$); } PERCENT_FLAG
+%printer { fprintf (stderr, "<%s>", $$); } TAG

 
 %type <integer> INT
 %printer { fprintf (stderr, "%d", $$); } INT
 
 %type <integer> INT
 %printer { fprintf (stderr, "%d", $$); } INT


@@ -225,10 +223,14 @@ prologue_declaration:
                         plain_code.code, @1);
       code_scanner_last_string_free ();
     }
                         plain_code.code, @1);
       code_scanner_last_string_free ();
     }

-| "%debug"                         { debug_flag = true; }
+| "%<flag>"
+    {
+      muscle_percent_define_ensure ($1, @1, true);
+    }

 | "%define" variable content.opt
     {
 | "%define" variable content.opt
     {

-      muscle_percent_define_insert ($2, @2, $3);
+      muscle_percent_define_insert ($2, @2, $3,
+                                    MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);

     }
 | "%defines"                       { defines_flag = true; }
 | "%defines" STRING
     }
 | "%defines"                       { defines_flag = true; }
 | "%defines" STRING


@@ -236,7 +238,6 @@ prologue_declaration:
       defines_flag = true;
       spec_defines_file = xstrdup ($2);
     }
       defines_flag = true;
       spec_defines_file = xstrdup ($2);
     }

-| "%error-verbose"                 { error_verbose = true; }

 | "%expect" INT                    { expected_sr_conflicts = $2; }
 | "%expect-rr" INT                { expected_rr_conflicts = $2; }
 | "%file-prefix" STRING            { spec_file_prefix = $2; }
 | "%expect" INT                    { expected_sr_conflicts = $2; }
 | "%expect-rr" INT                { expected_rr_conflicts = $2; }
 | "%file-prefix" STRING            { spec_file_prefix = $2; }


@@ -257,7 +258,6 @@ prologue_declaration:
     }
 | "%language" STRING           { language_argmatch ($2, grammar_prio, @1); }
 | "%lex-param" "{...}"         { add_param ("lex_param", $2, @2); }
     }
 | "%language" STRING           { language_argmatch ($2, grammar_prio, @1); }
 | "%lex-param" "{...}"         { add_param ("lex_param", $2, @2); }

-| "%locations"                  { locations_flag = true; }

 | "%name-prefix" STRING         { spec_name_prefix = $2; }
 | "%name-prefix" "=" STRING     { spec_name_prefix = $3; } /* deprecated */
 | "%no-lines"                   { no_lines_flag = true; }
 | "%name-prefix" STRING         { spec_name_prefix = $2; }
 | "%name-prefix" "=" STRING     { spec_name_prefix = $3; } /* deprecated */
 | "%no-lines"                   { no_lines_flag = true; }


@@ -265,19 +265,6 @@ prologue_declaration:
 | "%output" STRING              { spec_outfile = $2; }
 | "%output" "=" STRING          { spec_outfile = $3; }  /* deprecated */
 | "%parse-param" "{...}"       { add_param ("parse_param", $2, @2); }
 | "%output" STRING              { spec_outfile = $2; }
 | "%output" "=" STRING          { spec_outfile = $3; }  /* deprecated */
 | "%parse-param" "{...}"       { add_param ("parse_param", $2, @2); }

-| "%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
     {
 | "%require" STRING             { version_check (&@2, $2); }
 | "%skeleton" STRING
     {


@@ -547,17 +534,16 @@ rhs:
 | variable and content.opt.  |
 `---------------------------*/
 
 | variable and content.opt.  |
 `---------------------------*/
 

+/* The STRING form of variable is deprecated and is not M4-friendly.
+   For example, M4 fails for `%define "[" "value"'.  */

 variable:
   ID
 variable:
   ID

-| STRING { $$ = uniqstr_new ($1); } /* deprecated and not M4-friendly */
+| STRING { $$ = uniqstr_new ($1); }

 ;
 
 /* Some content or empty by default. */
 content.opt:
 ;
 
 /* Some content or empty by default. */
 content.opt:

-  /* Nothing. */
-    {
-      $$ = "";
-    }
+  /* Nothing. */   { $$ = ""; }

 | STRING
 ;
 
 | STRING
 ;