/* 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.
%defines
%locations
%pure-parser
-%error-verbose
+// %error-verbose
%defines
%name-prefix="gram_"
%{
#include "system.h"
-#include "muscle_tab.h"
+
+#include "complain.h"
+#include "conflicts.h"
#include "files.h"
#include "getargs.h"
-#include "output.h"
#include "gram.h"
+#include "muscle_tab.h"
+#include "output.h"
#include "reader.h"
-#include "conflicts.h"
+#include "symlist.h"
-/* Pass the control structure to YYPARSE and YYLEX. */
-#define YYPARSE_PARAM gram_control
-#define YYLEX_PARAM gram_control
-/* YYPARSE receives GRAM_CONTROL as a void *. Provide a
- correctly typed access to it. */
-#define yycontrol ((gram_control_t *) gram_control)
+/* Produce verbose syntax errors. */
+#define YYERROR_VERBOSE 1
-/* Request detailed parse error messages, and pass them to
- GRAM_ERROR. */
+#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 (yycontrol, &yylloc, Msg)
+ gram_error (&yylloc, Msg)
+static void gram_error (location const *, char const *);
-/* When debugging our pure parser, we want to see values and locations
- of the tokens. */
#define YYPRINT(File, Type, Value) \
- yyprint (File, &yylloc, Type, &Value)
-static void yyprint (FILE *file, const yyltype *loc,
- int type, const yystype *value);
+ print_token_value (File, Type, &Value)
+static void print_token_value (FILE *, int, YYSTYPE const *);
+
+static void add_param (char const *, char *, location);
symbol_class current_class = unknown_sym;
-char *current_type = 0;
-symbol_t *current_lhs;
-associativity current_assoc;
+uniqstr current_type = 0;
+symbol *current_lhs;
+location current_lhs_location;
+assoc current_assoc;
int current_prec = 0;
%}
/* Only NUMBERS have a value. */
%union
{
- symbol_t *symbol;
+ symbol *symbol;
+ symbol_list *list;
int integer;
- char *string;
- associativity assoc;
+ char *chars;
+ assoc assoc;
+ uniqstr uniqstr;
};
-/* Define the tokens together with there human representation. */
-%token GRAM_EOF 0 "end of string"
-%token STRING CHARACTER
-%token INT
-
-%token PERCENT_TOKEN "%token"
-%token PERCENT_NTERM "%nterm"
-%token PERCENT_TYPE "%type"
-%token PERCENT_UNION "%union"
-%token PERCENT_EXPECT "%expect"
-%token PERCENT_START "%start"
-%token PERCENT_LEFT "%left"
-%token PERCENT_RIGHT "%right"
-%token PERCENT_NONASSOC "%nonassoc"
-%token PERCENT_PREC "%prec"
-%token PERCENT_VERBOSE "%verbose"
-%token PERCENT_ERROR_VERBOSE "%error-verbose"
-
-%token PERCENT_OUTPUT "%output"
-%token PERCENT_FILE_PREFIX "%file-prefix"
-%token PERCENT_NAME_PREFIX "%name-prefix"
-
-%token PERCENT_DEFINE "%define"
-%token PERCENT_PURE_PARSER "%pure-parser"
-
-%token PERCENT_DEFINES "%defines"
-
-%token PERCENT_YACC "%yacc"
-
-%token PERCENT_DEBUG "%debug"
-%token PERCENT_LOCATIONS "%locations"
-%token PERCENT_NO_LINES "%no-lines"
-%token PERCENT_SKELETON "%skeleton"
-%token PERCENT_TOKEN_TABLE "%token-table"
-
-%token TYPE
-%token EQUAL "="
-%token SEMICOLON ";"
-%token COLON ":"
-%token PIPE "|"
-%token ID "identifier"
-%token PERCENT_PERCENT "%%"
-%token PROLOGUE EPILOGUE
-%token BRACED_CODE
+/* Define the tokens together with their human representation. */
+%token GRAM_EOF 0 "end of file"
+%token STRING "string"
+%token INT "integer"
+
+%token PERCENT_TOKEN "%token"
+%token PERCENT_NTERM "%nterm"
+
+%token PERCENT_TYPE "%type"
+%token PERCENT_DESTRUCTOR "%destructor {...}"
+%token PERCENT_PRINTER "%printer {...}"
+
+%token PERCENT_UNION "%union {...}"
+
+%token PERCENT_LEFT "%left"
+%token PERCENT_RIGHT "%right"
+%token PERCENT_NONASSOC "%nonassoc"
+
+%token PERCENT_PREC "%prec"
+%token PERCENT_DPREC "%dprec"
+%token PERCENT_MERGE "%merge"
+
+
+/*----------------------.
+| Global Declarations. |
+`----------------------*/
+
+%token
+ PERCENT_DEBUG "%debug"
+ PERCENT_DEFINE "%define"
+ PERCENT_DEFINES "%defines"
+ PERCENT_ERROR_VERBOSE "%error-verbose"
+ PERCENT_EXPECT "%expect"
+ PERCENT_FILE_PREFIX "%file-prefix"
+ PERCENT_GLR_PARSER "%glr-parser"
+ PERCENT_LEX_PARAM "%lex-param {...}"
+ PERCENT_LOCATIONS "%locations"
+ PERCENT_NAME_PREFIX "%name-prefix"
+ PERCENT_NO_LINES "%no-lines"
+ PERCENT_NONDETERMINISTIC_PARSER "%nondeterministic-parser"
+ PERCENT_OUTPUT "%output"
+ PERCENT_PARSE_PARAM "%parse-param {...}"
+ PERCENT_PURE_PARSER "%pure-parser"
+ PERCENT_SKELETON "%skeleton"
+ PERCENT_START "%start"
+ PERCENT_TOKEN_TABLE "%token-table"
+ PERCENT_VERBOSE "%verbose"
+ PERCENT_YACC "%yacc"
+;
-%type <string> CHARACTER TYPE BRACED_CODE PROLOGUE EPILOGUE epilogue.opt action STRING string_content
+%token TYPE "type"
+%token EQUAL "="
+%token SEMICOLON ";"
+%token PIPE "|"
+%token ID "identifier"
+%token ID_COLON "identifier:"
+%token PERCENT_PERCENT "%%"
+%token PROLOGUE "%{...%}"
+%token EPILOGUE "epilogue"
+%token BRACED_CODE "{...}"
+
+
+%type <chars> STRING string_content
+ "%destructor {...}"
+ "%lex-param {...}"
+ "%parse-param {...}"
+ "%printer {...}"
+ "%union {...}"
+ BRACED_CODE action
+ PROLOGUE EPILOGUE
+%type <uniqstr> TYPE
%type <integer> INT
-%type <symbol> ID symbol string_as_id
-%type <assoc> precedence_directive
+%type <symbol> ID ID_COLON symbol string_as_id
+%type <assoc> precedence_declarator
+%type <list> symbols.1
%%
-input: { LOCATION_RESET (yylloc); }
- directives "%%" gram epilogue.opt
- {
- yycontrol->errcode = 0;
- epilogue_set ($5, @5.first_line);
- }
+
+input:
+ declarations "%%" grammar epilogue.opt
;
-directives:
+
+ /*------------------------------------.
+ | Declarations: before the first %%. |
+ `------------------------------------*/
+
+declarations:
/* Nothing */
-| directives directive
+| declarations declaration
;
-directive:
- grammar_directives
-| PROLOGUE { prologue_augment ($1, @1.first_line); }
+declaration:
+ grammar_declaration
+| PROLOGUE { prologue_augment ($1, @1); }
| "%debug" { debug_flag = 1; }
| "%define" string_content string_content { muscle_insert ($2, $3); }
| "%defines" { defines_flag = 1; }
| "%error-verbose" { error_verbose = 1; }
| "%expect" INT { expected_conflicts = $2; }
| "%file-prefix" "=" string_content { spec_file_prefix = $3; }
+| "%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; }
+| "%nondeterministic-parser" { nondeterministic_parser = true; }
| "%output" "=" string_content { spec_outfile = $3; }
-| "%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; }
-| "%verbose" { report_flag = 1; }
+| "%verbose" { report_flag = report_states; }
| "%yacc" { yacc_flag = 1; }
+| ";"
;
-grammar_directives:
- precedence_directives
-| "%nterm" { current_class = nterm_sym; } symbol_defs.1
+grammar_declaration:
+ precedence_declaration
+| symbol_declaration
+| "%start" symbol
{
- current_class = unknown_sym;
- current_type = NULL;
+ grammar_start_symbol_set ($2, @2);
}
-| "%start" symbol
+| "%union {...}"
{
- grammar_start_symbol_set ($2);
+ typed = 1;
+ MUSCLE_INSERT_INT ("stype_line", @1.start.line);
+ muscle_insert ("stype", $1);
}
-| "%token" { current_class = token_sym; } symbol_defs.1
+| "%destructor {...}" symbols.1
+ {
+ symbol_list *list;
+ for (list = $2; list; list = list->next)
+ symbol_destructor_set (list->sym, $1, @1);
+ symbol_list_free ($2);
+ }
+| "%printer {...}" symbols.1
+ {
+ symbol_list *list;
+ for (list = $2; list; list = list->next)
+ symbol_printer_set (list->sym, $1, list->location);
+ symbol_list_free ($2);
+ }
+;
+
+symbol_declaration:
+ "%nterm" { current_class = nterm_sym; } symbol_defs.1
{
current_class = unknown_sym;
current_type = NULL;
}
-| "%type" TYPE {current_type = $2; } nterms_to_type.1
+| "%token" { current_class = token_sym; } symbol_defs.1
{
+ current_class = unknown_sym;
current_type = NULL;
}
-| "%union" BRACED_CODE semi_colon_opt
+| "%type" TYPE symbols.1
{
- typed = 1;
- MUSCLE_INSERT_INT ("stype_line", @2.first_line);
- muscle_insert ("stype", $2);
+ symbol_list *list;
+ for (list = $3; list; list = list->next)
+ symbol_type_set (list->sym, $2, @2);
+ symbol_list_free ($3);
}
;
-precedence_directives:
- precedence_directive type.opt
- { current_assoc = $1; ++current_prec; }
- terms_to_prec.1
- { current_assoc = non_assoc; current_type = NULL; }
+precedence_declaration:
+ precedence_declarator type.opt symbols.1
+ {
+ symbol_list *list;
+ ++current_prec;
+ for (list = $3; list; list = list->next)
+ {
+ symbol_type_set (list->sym, current_type, @2);
+ symbol_precedence_set (list->sym, current_prec, $1, @1);
+ }
+ symbol_list_free ($3);
+ current_type = NULL;
+ }
;
-precedence_directive:
+precedence_declarator:
"%left" { $$ = left_assoc; }
| "%right" { $$ = right_assoc; }
| "%nonassoc" { $$ = non_assoc; }
;
type.opt:
- /* Nothing. */ { current_type = NULL;}
+ /* Nothing. */ { current_type = NULL; }
| TYPE { current_type = $1; }
;
/* One or more nonterminals to be %typed. */
-nterms_to_type.1:
- ID { symbol_type_set ($1, current_type); }
-| nterms_to_type.1 ID { symbol_type_set ($2, current_type); }
-;
-/* One or more symbols to be given a precedence/associativity. */
-terms_to_prec.1:
- symbol
- {
- symbol_type_set ($1, current_type);
- symbol_precedence_set ($1, current_prec, current_assoc);
- }
-| terms_to_prec.1 symbol
- {
- symbol_type_set ($2, current_type);
- symbol_precedence_set ($2, current_prec, current_assoc);
- }
+symbols.1:
+ symbol { $$ = symbol_list_new ($1, @1); }
+| symbols.1 symbol { $$ = symbol_list_prepend ($1, $2, @2); }
;
-
/* One token definition. */
symbol_def:
TYPE
}
| ID
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
}
| ID INT
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
- symbol_user_token_number_set ($1, $2);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
+ symbol_user_token_number_set ($1, $2, @2);
}
| ID string_as_id
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
- symbol_make_alias ($1, $2);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
+ symbol_make_alias ($1, $2, @$);
}
| ID INT string_as_id
{
- symbol_class_set ($1, current_class);
- symbol_type_set ($1, current_type);
- symbol_user_token_number_set ($1, $2);
- symbol_make_alias ($1, $3);
+ symbol_class_set ($1, current_class, @1);
+ symbol_type_set ($1, current_type, @1);
+ symbol_user_token_number_set ($1, $2, @2);
+ symbol_make_alias ($1, $3, @$);
}
;
/* One or more symbol definitions. */
symbol_defs.1:
symbol_def
- {;}
| symbol_defs.1 symbol_def
- {;}
;
-gram:
+
+ /*------------------------------------------.
+ | The grammar section: between the two %%. |
+ `------------------------------------------*/
+
+grammar:
+ rules_or_grammar_declaration
+| grammar rules_or_grammar_declaration
+;
+
+/* As a Bison extension, one can use the grammar declarations in the
+ body of the grammar. */
+rules_or_grammar_declaration:
rules
-| gram rules
+| grammar_declaration ";"
+ {
+ if (yacc_flag)
+ complain_at (@$, _("POSIX forbids declarations in the grammar"));
+ }
+| error ";"
+ {
+ yyerrok;
+ }
;
rules:
- ID ":" { current_lhs = $1; } rhses.1 ";"
- {;}
+ ID_COLON { current_lhs = $1; current_lhs_location = @1; } rhses.1
;
rhses.1:
- rhs { grammar_rule_end (); }
-| rhses.1 "|" rhs { grammar_rule_end (); }
+ rhs { grammar_rule_end (@1); }
+| rhses.1 "|" rhs { grammar_rule_end (@3); }
+| rhses.1 ";"
;
rhs:
/* Nothing. */
- { grammar_rule_begin (current_lhs); }
+ { grammar_rule_begin (current_lhs, current_lhs_location); }
| rhs symbol
- { grammar_current_rule_symbol_append ($2); }
+ { grammar_current_rule_symbol_append ($2, @2); }
| rhs action
- { grammar_current_rule_action_append ($2, @2.first_line); }
+ { grammar_current_rule_action_append ($2, @2); }
| rhs "%prec" symbol
- { grammar_current_rule_prec_set ($3); }
+ { grammar_current_rule_prec_set ($3, @3); }
+| rhs "%dprec" INT
+ { grammar_current_rule_dprec_set ($3, @3); }
+| rhs "%merge" TYPE
+ { grammar_current_rule_merge_set ($3, @3); }
;
symbol:
ID { $$ = $1; }
| string_as_id { $$ = $1; }
-| CHARACTER { $$ = getsym ($1); }
;
action:
string_as_id:
STRING
{
- $$ = getsym ($1);
- symbol_class_set ($$, token_sym);
+ $$ = symbol_get ($1, @1);
+ symbol_class_set ($$, token_sym, @1);
}
;
epilogue.opt:
/* Nothing. */
- {
- $$ = xstrdup ("");
- }
| "%%" EPILOGUE
{
- $$ = $2;
+ epilogue_augment ($2, @2);
+ scanner_last_string_free ();
}
;
-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
-yyprint (FILE *file,
- const yyltype *loc, int type, const yystype *value)
+add_param (char const *type, char *decl, location loc)
{
- fputs (" (", file);
- LOCATION_PRINT (file, *loc);
- fputs (")", file);
- switch (type)
+ 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
{
- case CHARACTER:
- fprintf (file, " = '%s'", value->string);
- break;
+ 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)
+{
+ fputc (' ', file);
+ switch (type)
+ {
case ID:
fprintf (file, " = %s", value->symbol->tag);
break;
break;
case STRING:
- fprintf (file, " = \"%s\"", value->string);
+ fprintf (file, " = \"%s\"", value->chars);
break;
case TYPE:
- fprintf (file, " = <%s>", value->string);
+ fprintf (file, " = <%s>", value->uniqstr);
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:
- fprintf (file, " = {{ %s }}", value->string);
+ fprintf (file, " = {{ %s }}", value->chars);
+ break;
+
+ default:
+ fprintf (file, "unknown token type");
break;
}
}
-void
-gram_error (gram_control_t *control ATTRIBUTE_UNUSED,
- yyltype *yylloc, const char *msg)
+static void
+gram_error (location const *loc, char const *msg)
+{
+ complain_at (*loc, "%s", msg);
+}
+
+char const *
+token_name (int type)
{
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": %s\n", msg);
+ return yytname[type];
}
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