* src/gram.h, src/gram.c (pure_parser, glr_parser): Move to...

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

diff --git a/src/parse-gram.y b/src/parse-gram.y
index 303e3cee6cfce103befb9bae9921c3d0f6d8498f..606ec569fc49fe53f41a35b1fc5c95fa763d7aa6 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,5 +1,6 @@
 /* Bison Grammar Parser                             -*- C -*-
 /* Bison Grammar Parser                             -*- C -*-

-   Copyright (C) 2002 Free Software Foundation, Inc.
+
+   Copyright (C) 2002, 2003 Free Software Foundation, Inc.

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


@@ -30,62 +31,54 @@
 
 %{
 #include "system.h"
 
 %{
 #include "system.h"

+

 #include "complain.h"
 #include "complain.h"

-#include "muscle_tab.h"
+#include "conflicts.h"

 #include "files.h"
 #include "getargs.h"
 #include "files.h"
 #include "getargs.h"

-#include "output.h"
-#include "symlist.h"

 #include "gram.h"
 #include "gram.h"

+#include "muscle_tab.h"
+#include "output.h"

 #include "reader.h"
 #include "reader.h"

-#include "conflicts.h"
+#include "symlist.h"

 
 /* Produce verbose syntax errors.  */
 #define YYERROR_VERBOSE 1
 
 /* Produce verbose syntax errors.  */
 #define YYERROR_VERBOSE 1

-#define YYLLOC_DEFAULT(Current, Rhs, N)                        \
-do {                                                   \
-  if (N)                                               \
-  {                                                    \
-    Current.first_column  = Rhs[1].first_column;       \
-    Current.first_line    = Rhs[1].first_line;         \
-    Current.last_column   = Rhs[N].last_column;                \
-    Current.last_line     = Rhs[N].last_line;          \
-  }                                                    \
-  else                                                 \
-  {                                                    \
-    Current = Rhs[0];                                  \
-  }                                                    \
-} while (0)
+
+#define YYLLOC_DEFAULT(Current, Rhs, N)  (Current) = lloc_default (Rhs, N)
+static YYLTYPE lloc_default (YYLTYPE const *, int);

 
 /* Request detailed syntax error messages, and pass them to GRAM_ERROR.
    FIXME: depends on the undocumented availability of YYLLOC.  */
 #undef  yyerror
 #define yyerror(Msg) \
         gram_error (&yylloc, Msg)
 
 /* Request detailed syntax error messages, and pass them to GRAM_ERROR.
    FIXME: depends on the undocumented availability of YYLLOC.  */
 #undef  yyerror
 #define yyerror(Msg) \
         gram_error (&yylloc, Msg)

+static void gram_error (location const *, char const *);

 
 #define YYPRINT(File, Type, Value) \
        print_token_value (File, Type, &Value)
 
 #define YYPRINT(File, Type, Value) \
        print_token_value (File, Type, &Value)

-static void print_token_value (FILE *file, int type, YYSTYPE const *value);
+static void print_token_value (FILE *, int, YYSTYPE const *);
+
+static void add_param (char const *, char *, location);

 
 symbol_class current_class = unknown_sym;
 
 symbol_class current_class = unknown_sym;

-struniq_t current_type = 0;
-symbol_t *current_lhs;
-location_t current_lhs_location;
-assoc_t current_assoc;
+uniqstr current_type = 0;
+symbol *current_lhs;
+location current_lhs_location;
+assoc current_assoc;

 int current_prec = 0;
 int current_prec = 0;

-braced_code_t current_braced_code = action_braced_code;

 %}
 
 
 /* Only NUMBERS have a value.  */
 %union
 {
 %}
 
 
 /* Only NUMBERS have a value.  */
 %union
 {

-  symbol_t *symbol;
-  symbol_list_t *list;
+  symbol *symbol;
+  symbol_list *list;

   int integer;
   int integer;

-  char *string;
-  assoc_t assoc;
-  struniq_t struniq;
+  char *chars;
+  assoc assoc;
+  uniqstr uniqstr;

 };
 
 /* Define the tokens together with their human representation.  */
 };
 
 /* Define the tokens together with their human representation.  */


@@ -97,10 +90,10 @@ braced_code_t current_braced_code = action_braced_code;
 %token PERCENT_NTERM       "%nterm"
 
 %token PERCENT_TYPE        "%type"
 %token PERCENT_NTERM       "%nterm"
 
 %token PERCENT_TYPE        "%type"

-%token PERCENT_DESTRUCTOR  "%destructor"
-%token PERCENT_PRINTER     "%printer"
+%token PERCENT_DESTRUCTOR  "%destructor {...}"
+%token PERCENT_PRINTER     "%printer {...}"

 
 

-%token PERCENT_UNION       "%union"
+%token PERCENT_UNION       "%union {...}"

 
 %token PERCENT_LEFT        "%left"
 %token PERCENT_RIGHT       "%right"
 
 %token PERCENT_LEFT        "%left"
 %token PERCENT_RIGHT       "%right"


@@ -123,12 +116,13 @@ braced_code_t current_braced_code = action_braced_code;
   PERCENT_EXPECT        "%expect"
   PERCENT_FILE_PREFIX   "%file-prefix"
   PERCENT_GLR_PARSER    "%glr-parser"
   PERCENT_EXPECT        "%expect"
   PERCENT_FILE_PREFIX   "%file-prefix"
   PERCENT_GLR_PARSER    "%glr-parser"

-  PERCENT_LEX_PARAM     "%lex-param"
+  PERCENT_LEX_PARAM     "%lex-param {...}"

   PERCENT_LOCATIONS     "%locations"
   PERCENT_NAME_PREFIX   "%name-prefix"
   PERCENT_NO_LINES      "%no-lines"
   PERCENT_LOCATIONS     "%locations"
   PERCENT_NAME_PREFIX   "%name-prefix"
   PERCENT_NO_LINES      "%no-lines"

+  PERCENT_NONDETERMINISTIC_PARSER    "%nondeterministic-parser"

   PERCENT_OUTPUT        "%output"
   PERCENT_OUTPUT        "%output"

-  PERCENT_PARSE_PARAM   "%parse-param"
+  PERCENT_PARSE_PARAM   "%parse-param {...}"

   PERCENT_PURE_PARSER   "%pure-parser"
   PERCENT_SKELETON      "%skeleton"
   PERCENT_START         "%start"
   PERCENT_PURE_PARSER   "%pure-parser"
   PERCENT_SKELETON      "%skeleton"
   PERCENT_START         "%start"


@@ -140,22 +134,26 @@ braced_code_t current_braced_code = action_braced_code;
 %token TYPE            "type"
 %token EQUAL           "="
 %token SEMICOLON       ";"
 %token TYPE            "type"
 %token EQUAL           "="
 %token SEMICOLON       ";"

-%token COLON           ":"
-%token COMMA           ","

 %token PIPE            "|"
 %token ID              "identifier"
 %token PIPE            "|"
 %token ID              "identifier"

+%token ID_COLON        "identifier:"

 %token PERCENT_PERCENT "%%"
 %token PROLOGUE        "%{...%}"
 %token EPILOGUE        "epilogue"
 %token BRACED_CODE     "{...}"
 
 
 %token PERCENT_PERCENT "%%"
 %token PROLOGUE        "%{...%}"
 %token EPILOGUE        "epilogue"
 %token BRACED_CODE     "{...}"
 
 

-%type <string> STRING string_content
-               BRACED_CODE code_content action
-               PROLOGUE EPILOGUE
-%type <struniq> TYPE
+%type <chars> STRING string_content
+             "%destructor {...}"
+             "%lex-param {...}"
+             "%parse-param {...}"
+             "%printer {...}"
+             "%union {...}"
+             BRACED_CODE action
+             PROLOGUE EPILOGUE
+%type <uniqstr> TYPE

 %type <integer> INT
 %type <integer> INT

-%type <symbol> ID symbol string_as_id
+%type <symbol> ID ID_COLON symbol string_as_id

 %type <assoc> precedence_declarator
 %type <list>  symbols.1
 %%
 %type <assoc> precedence_declarator
 %type <list>  symbols.1
 %%


@@ -171,7 +169,7 @@ input:
 
 declarations:
   /* Nothing */
 
 declarations:
   /* Nothing */

-| declarations declaration semi_colon.opt
+| declarations declaration

 ;
 
 declaration:
 ;
 
 declaration:


@@ -183,26 +181,21 @@ declaration:
 | "%error-verbose"                         { error_verbose = 1; }
 | "%expect" INT                            { expected_conflicts = $2; }
 | "%file-prefix" "=" string_content        { spec_file_prefix = $3; }
 | "%error-verbose"                         { error_verbose = 1; }
 | "%expect" INT                            { expected_conflicts = $2; }
 | "%file-prefix" "=" string_content        { spec_file_prefix = $3; }

-| "%glr-parser"                           { glr_parser = 1; }
-| "%lex-param" code_content "," code_content
-                           {
-                            muscle_pair_list_grow ("lex_param", $2, $4);
-                            scanner_last_string_free ();
-                          }
+| "%glr-parser"                           { nondeterministic_parser = true;
+                                             glr_parser = true; }
+| "%lex-param {...}"                      { add_param ("lex_param", $1, @1); }

 | "%locations"                             { locations_flag = 1; }
 | "%name-prefix" "=" string_content        { spec_name_prefix = $3; }
 | "%no-lines"                              { no_lines_flag = 1; }
 | "%locations"                             { locations_flag = 1; }
 | "%name-prefix" "=" string_content        { spec_name_prefix = $3; }
 | "%no-lines"                              { no_lines_flag = 1; }

+| "%nondeterministic-parser"              { nondeterministic_parser = true; }

 | "%output" "=" string_content             { spec_outfile = $3; }
 | "%output" "=" string_content             { spec_outfile = $3; }

-| "%parse-param" code_content "," code_content
-                           {
-                            muscle_pair_list_grow ("parse_param", $2, $4);
-                            scanner_last_string_free ();
-                          }
-| "%pure-parser"                           { pure_parser = 1; }
+| "%parse-param {...}"                  { add_param ("parse_param", $1, @1); }
+| "%pure-parser"                           { pure_parser = true; }

 | "%skeleton" string_content               { skeleton = $2; }
 | "%token-table"                           { token_table_flag = 1; }
 | "%skeleton" string_content               { skeleton = $2; }
 | "%token-table"                           { token_table_flag = 1; }

-| "%verbose"                               { report_flag = 1; }
+| "%verbose"                               { report_flag = report_states; }

 | "%yacc"                                  { yacc_flag = 1; }
 | "%yacc"                                  { yacc_flag = 1; }

+| ";"

 ;
 
 grammar_declaration:
 ;
 
 grammar_declaration:


@@ -212,31 +205,25 @@ grammar_declaration:
     {
       grammar_start_symbol_set ($2, @2);
     }
     {
       grammar_start_symbol_set ($2, @2);
     }

-| "%union" BRACED_CODE
+| "%union {...}"

     {
       typed = 1;
     {
       typed = 1;

-      MUSCLE_INSERT_INT ("stype_line", @2.first_line);
-      muscle_insert ("stype", $2);
+      MUSCLE_INSERT_INT ("stype_line", @1.start.line);
+      muscle_insert ("stype", $1);

     }
     }

-| "%destructor"
-    { current_braced_code = destructor_braced_code; }
-  BRACED_CODE symbols.1
+| "%destructor {...}" symbols.1

     {
     {

-      symbol_list_t *list;
-      for (list = $4; list; list = list->next)
-       symbol_destructor_set (list->sym, $3, @3);
-      symbol_list_free ($4);
-      current_braced_code = action_braced_code;
+      symbol_list *list;
+      for (list = $2; list; list = list->next)
+       symbol_destructor_set (list->sym, $1, @1);
+      symbol_list_free ($2);

     }
     }

-| "%printer"
-    { current_braced_code = printer_braced_code; }
-  BRACED_CODE symbols.1
+| "%printer {...}" symbols.1

     {
     {

-      symbol_list_t *list;
-      for (list = $4; list; list = list->next)
-       symbol_printer_set (list->sym, $3, list->location);
-      symbol_list_free ($4);
-      current_braced_code = action_braced_code;
+      symbol_list *list;
+      for (list = $2; list; list = list->next)
+       symbol_printer_set (list->sym, $1, list->location);
+      symbol_list_free ($2);

     }
 ;
 
     }
 ;
 


@@ -253,7 +240,7 @@ symbol_declaration:
     }
 | "%type" TYPE symbols.1
     {
     }
 | "%type" TYPE symbols.1
     {

-      symbol_list_t *list;
+      symbol_list *list;

       for (list = $3; list; list = list->next)
        symbol_type_set (list->sym, $2, @2);
       symbol_list_free ($3);
       for (list = $3; list; list = list->next)
        symbol_type_set (list->sym, $2, @2);
       symbol_list_free ($3);


@@ -263,7 +250,7 @@ symbol_declaration:
 precedence_declaration:
   precedence_declarator type.opt symbols.1
     {
 precedence_declaration:
   precedence_declarator type.opt symbols.1
     {

-      symbol_list_t *list;
+      symbol_list *list;

       ++current_prec;
       for (list = $3; list; list = list->next)
        {
       ++current_prec;
       for (list = $3; list; list = list->next)
        {


@@ -328,9 +315,7 @@ symbol_def:
 /* One or more symbol definitions. */
 symbol_defs.1:
   symbol_def
 /* One or more symbol definitions. */
 symbol_defs.1:
   symbol_def

-    {;}

 | symbol_defs.1 symbol_def
 | symbol_defs.1 symbol_def

-    {;}

 ;
 
 
 ;
 
 


@@ -344,11 +329,10 @@ grammar:
 ;
 
 /* As a Bison extension, one can use the grammar declarations in the
 ;
 
 /* As a Bison extension, one can use the grammar declarations in the

-   body of the grammar.  But to remain LALR(1), they must be ended
-   with a semi-colon.  */
+   body of the grammar.  */

 rules_or_grammar_declaration:
   rules
 rules_or_grammar_declaration:
   rules

-| grammar_declaration ";"
+| grammar_declaration

     {
       if (yacc_flag)
        complain_at (@$, _("POSIX forbids declarations in the grammar"));
     {
       if (yacc_flag)
        complain_at (@$, _("POSIX forbids declarations in the grammar"));


@@ -357,11 +341,11 @@ rules_or_grammar_declaration:
     {
       yyerrok;
     }
     {
       yyerrok;
     }

+| ";"

 ;
 
 rules:
 ;
 
 rules:

-  ID ":" { current_lhs = $1; current_lhs_location = @1; } rhses.1 ";"
-    {;}
+  ID_COLON { current_lhs = $1; current_lhs_location = @1; } rhses.1

 ;
 
 rhses.1:
 ;
 
 rhses.1:


@@ -412,15 +396,6 @@ string_content:
     };
 
 
     };
 
 

-/* A BRACED_CODE used for its contents.  Strip the braces. */
-code_content:
-  BRACED_CODE
-    {
-      $$ = $1 + 1;
-      $$[strlen ($$) - 1] = '\0';
-    };
-
-

 epilogue.opt:
   /* Nothing.  */
 | "%%" EPILOGUE
 epilogue.opt:
   /* Nothing.  */
 | "%%" EPILOGUE


@@ -430,14 +405,83 @@ epilogue.opt:
     }
 ;
 
     }
 ;
 

-semi_colon.opt:
-  /* Nothing.  */
-| ";"
-;

 %%
 %%

-/*------------------------------------------------------------------.
-| When debugging the parser, display tokens' locations and values.  |
-`------------------------------------------------------------------*/
+
+
+/* Return the location of the left-hand side of a rule whose
+   right-hand side is RHS[1] ... RHS[N].  Ignore empty nonterminals in
+   the right-hand side, and return an empty location equal to the end
+   boundary of RHS[0] if the right-hand side is empty.  */
+
+static YYLTYPE
+lloc_default (YYLTYPE const *rhs, int n)
+{
+  int i;
+  YYLTYPE loc;
+  loc.start = loc.end = rhs[n].end;
+
+  /* Ignore empty nonterminals the start of the the right-hand side.
+     Do not bother to ignore them at the end of the right-hand side,
+     since empty nonterminals have the same end as their predecessors.  */
+  for (i = 1; i <= n; i++)
+    if (! equal_boundaries (rhs[i].start, rhs[i].end))
+      {
+       loc.start = rhs[i].start;
+       break;
+      }
+
+  return loc;
+}
+
+
+/* Add a lex-param or a parse-param (depending on TYPE) with
+   declaration DECL and location LOC.  */
+
+static void
+add_param (char const *type, char *decl, location loc)
+{
+  static char const alphanum[] =
+    "0123456789"
+    "abcdefghijklmnopqrstuvwxyz"
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    "_";
+  char const *alpha = alphanum + 10;
+  char const *name_start = NULL;
+  char *p;
+
+  for (p = decl; *p; p++)
+    if ((p == decl || ! strchr (alphanum, p[-1])) && strchr (alpha, p[0]))
+      name_start = p;
+
+  /* Strip the surrounding '{' and '}'.  */
+  decl++;
+  p[-1] = '\0';
+
+  if (! name_start)
+    complain_at (loc, _("missing identifier in parameter declaration"));
+  else
+    {
+      char *name;
+      size_t name_len;
+
+      for (name_len = 1;
+          name_start[name_len] && strchr (alphanum, name_start[name_len]);
+          name_len++)
+       continue;
+
+      name = xmalloc (name_len + 1);
+      memcpy (name, name_start, name_len);
+      name[name_len] = '\0';
+      muscle_pair_list_grow (type, decl, name);
+      free (name);
+    }
+
+  scanner_last_string_free ();
+}
+
+/*----------------------------------------------------.
+| When debugging the parser, display tokens' values.  |
+`----------------------------------------------------*/

 
 static void
 print_token_value (FILE *file, int type, YYSTYPE const *value)
 
 static void
 print_token_value (FILE *file, int type, YYSTYPE const *value)


@@ -454,17 +498,22 @@ print_token_value (FILE *file, int type, YYSTYPE const *value)
       break;
 
     case STRING:
       break;
 
     case STRING:

-      fprintf (file, " = \"%s\"", value->string);
+      fprintf (file, " = \"%s\"", value->chars);

       break;
 
     case TYPE:
       break;
 
     case TYPE:

-      fprintf (file, " = <%s>", value->struniq);
+      fprintf (file, " = <%s>", value->uniqstr);

       break;
 
     case BRACED_CODE:
       break;
 
     case BRACED_CODE:

+    case PERCENT_DESTRUCTOR:
+    case PERCENT_LEX_PARAM:
+    case PERCENT_PARSE_PARAM:
+    case PERCENT_PRINTER:
+    case PERCENT_UNION:

     case PROLOGUE:
     case EPILOGUE:
     case PROLOGUE:
     case EPILOGUE:

-      fprintf (file, " = {{ %s }}", value->string);
+      fprintf (file, " = {{ %s }}", value->chars);

       break;
 
     default:
       break;
 
     default:


@@ -473,8 +522,14 @@ print_token_value (FILE *file, int type, YYSTYPE const *value)
     }
 }
 
     }
 }
 

-void
-gram_error (location_t const *loc, char const *msg)
+static void
+gram_error (location const *loc, char const *msg)

 {
   complain_at (*loc, "%s", msg);
 }
 {
   complain_at (*loc, "%s", msg);
 }

+
+char const *
+token_name (int type)
+{
+  return yytname[type];
+}