Have Bison grammars parsed by a Bison grammar.

* src/reader.c, src/reader.h (prologue_augment): New.
* src/reader.c (copy_definition): Remove.
* src/reader.h, src/reader.c (gram_start_symbol_set, prologue_augment)
(grammar_symbol_append, grammar_rule_begin, grammar_midrule_action)
(grammar_current_rule_prec_set, grammar_current_rule_check)
(grammar_current_rule_symbol_append)
(grammar_current_rule_action_append): Export.
* src/parse-gram.y (symbol_list_new, symbol_list_symbol_append_
(symbol_list_action_append): Remove.
Hook the routines from reader.
* src/scan-gram.l: In INITIAL, characters and strings are tokens.
* src/system.h (ATTRIBUTE_NORETURN, ATTRIBUTE_UNUSED): Now.
* src/reader.c (read_declarations): Remove, unused.
* src/parse-gram.y: Handle the epilogue.
* src/reader.h, src/reader.c (gram_start_symbol_set): Rename as...
(grammar_start_symbol_set): this.
* src/scan-gram.l: Be sure to ``use'' yycontrol to keep GCC quiet.
* src/reader.c (readgram): Remove, unused.
(reader): Adjust to insert eoftoken and axiom where appropriate.
* src/reader.c (copy_dollar): Replace with...
* src/scan-gram.h (handle_dollar): this.
* src/parse-gram.y: Remove `%thong'.
* src/reader.c (copy_at): Replace with...
* src/scan-gram.h (handle_at): this.
* src/complain.h, src/complain.c (warn_at, complain_at, fatal_at):
New.
* src/scan-gram.l (YY_LINES): Keep lineno synchronized for the
time being.
* src/reader.h, src/reader.c (grammar_rule_end): New.
* src/parse.y (current_type, current_class): New.
Implement `%nterm', `%token' support.
Merge `%term' into `%token'.
(string_as_id): New.
* src/symtab.h, src/symtab.c (symbol_make_alias): Don't pass the
type name.
* src/parse-gram.y: Be sure to handle properly the beginning of
rules.
* src/parse-gram.y: Handle %type.
* src/reader.c (grammar_rule_end): Call grammar_current_rule_check.
* src/parse-gram.y: More directives support.
* src/options.c: No longer handle source directives.
* src/parse-gram.y: Fix %output.
* src/parse-gram.y: Handle %union.
Use the prologue locations.
* src/reader.c (parse_union_decl): Remove.
* src/reader.h, src/reader.c (epilogue_set): New.
* src/parse-gram.y: Use it.
* data/bison.simple, data/bison.c++: b4_stype is now either not
defined, then default to int, or to the contents of %union,
without `union' itself.
Adjust.
* src/muscle_tab.c (muscle_init): Don't predefine `stype'.
* src/output.c (actions_output): Don't output braces, as they are
already handled by the scanner.
* src/scan-gram.l (SC_CHARACTER): Set the user_token_number of
characters to themselves.
* tests/reduce.at (Reduced Automaton): End the grammars with %% so
that the epilogue has a proper #line.
* src/parse-gram.y: Handle precedence/associativity.
* src/symtab.c (symbol_precedence_set): Requires the symbol to be
a terminal.
* src/scan-gram.l (SC_BRACED_CODE): Catch strings and characters.
* tests/calc.at: Do not use `%token "foo"' as it makes not sense
at all to define terminals that cannot be emitted.
* src/scan-gram.l: Escape M4 characters.
* src/scan-gram.l: Working properly with escapes in user
strings/characters.
* tests/torture.at (AT_DATA_TRIANGULAR_GRAMMAR)
(AT_DATA_HORIZONTAL_GRAMMAR): Respect the `%token ID NUM STRING'
grammar.
Use more modest sizes, as for the time being the parser does not
release memory, and therefore the process swallows a huge amount
of memory.
* tests/torture.at (AT_DATA_LOOKAHEADS_GRAMMAR): Adjust to the
stricter %token grammar.
* src/symtab.h (associativity): Add `undef_assoc'.
(symbol_precedence_set): Do nothing when passed an undef_assoc.
* src/symtab.c (symbol_check_alias_consistence): Adjust.
* tests/regression.at (Invalid %directive): Remove, as it is now
meaningless.
(Invalid inputs): Adjust to the new error messages.
(Token definitions): The new grammar doesn't allow too many
eccentricities.
* src/lex.h, src/lex.c: Remove.
* src/reader.c (lastprec, skip_to_char, read_signed_integer)
(copy_character, copy_string2, copy_string, copy_identifier)
(copy_comment, parse_token_decl, parse_type_decl, parse_assoc_decl)
(parse_muscle_decl, parse_dquoted_param, parse_skel_decl)
(parse_action): Remove.
* po/POTFILES.in: Adjust.

src/parse-gram.h

@@ -0,0 +1,124 @@
+#ifndef BISON_PARSE_GRAM_H
+# define BISON_PARSE_GRAM_H
+
+/* Tokens.  */
+#ifndef YYTOKENTYPE
+# if defined (__STDC__) || defined (__cplusplus)
+   /* Put the tokens into the symbol table, so that GDB and other debuggers
+      know about them.  */
+   enum yytokentype {
+     GRAM_EOF = 0,
+     STRING = 258,
+     CHARACTER = 259,
+     INT = 260,
+     PERCENT_TOKEN = 261,
+     PERCENT_NTERM = 262,
+     PERCENT_TYPE = 263,
+     PERCENT_UNION = 264,
+     PERCENT_EXPECT = 265,
+     PERCENT_START = 266,
+     PERCENT_LEFT = 267,
+     PERCENT_RIGHT = 268,
+     PERCENT_NONASSOC = 269,
+     PERCENT_PREC = 270,
+     PERCENT_VERBOSE = 271,
+     PERCENT_ERROR_VERBOSE = 272,
+     PERCENT_OUTPUT = 273,
+     PERCENT_FILE_PREFIX = 274,
+     PERCENT_NAME_PREFIX = 275,
+     PERCENT_DEFINE = 276,
+     PERCENT_PURE_PARSER = 277,
+     PERCENT_DEFINES = 278,
+     PERCENT_YACC = 279,
+     PERCENT_DEBUG = 280,
+     PERCENT_LOCATIONS = 281,
+     PERCENT_NO_LINES = 282,
+     PERCENT_SKELETON = 283,
+     PERCENT_TOKEN_TABLE = 284,
+     TYPE = 285,
+     EQUAL = 286,
+     SEMICOLON = 287,
+     COLON = 288,
+     PIPE = 289,
+     ID = 290,
+     PERCENT_PERCENT = 291,
+     PROLOGUE = 292,
+     EPILOGUE = 293,
+     BRACED_CODE = 294
+   };
+# endif
+  /* POSIX requires `int' for tokens in interfaces.  */
+# define YYTOKENTYPE int
+#endif /* !YYTOKENTYPE */
+#define GRAM_EOF 0
+#define STRING 258
+#define CHARACTER 259
+#define INT 260
+#define PERCENT_TOKEN 261
+#define PERCENT_NTERM 262
+#define PERCENT_TYPE 263
+#define PERCENT_UNION 264
+#define PERCENT_EXPECT 265
+#define PERCENT_START 266
+#define PERCENT_LEFT 267
+#define PERCENT_RIGHT 268
+#define PERCENT_NONASSOC 269
+#define PERCENT_PREC 270
+#define PERCENT_VERBOSE 271
+#define PERCENT_ERROR_VERBOSE 272
+#define PERCENT_OUTPUT 273
+#define PERCENT_FILE_PREFIX 274
+#define PERCENT_NAME_PREFIX 275
+#define PERCENT_DEFINE 276
+#define PERCENT_PURE_PARSER 277
+#define PERCENT_DEFINES 278
+#define PERCENT_YACC 279
+#define PERCENT_DEBUG 280
+#define PERCENT_LOCATIONS 281
+#define PERCENT_NO_LINES 282
+#define PERCENT_SKELETON 283
+#define PERCENT_TOKEN_TABLE 284
+#define TYPE 285
+#define EQUAL 286
+#define SEMICOLON 287
+#define COLON 288
+#define PIPE 289
+#define ID 290
+#define PERCENT_PERCENT 291
+#define PROLOGUE 292
+#define EPILOGUE 293
+#define BRACED_CODE 294
+
+
+
+
+#ifndef YYSTYPE
+#line 70 "parse-gram.y"
+typedef union
+{
+  symbol_t *symbol;
+  int integer;
+  char *string;
+  associativity assoc;
+}
+yystype;
+# define YYSTYPE yystype
+#endif
+
+
+
+#ifndef YYLTYPE
+typedef struct yyltype
+{
+  int first_line;
+  int first_column;
+  int last_line;
+  int last_column;
+} yyltype;
+# define YYLTYPE yyltype
+#endif
+
+
+
+#endif /* not BISON_PARSE_GRAM_H */
+