scan-gram.c

GNU的词法/语法分析器bison源码

#include <get-errno.h>
#include <quote.h>

#include "complain.h"
#include "files.h"
#include "getargs.h"
#include "gram.h"
#include "quotearg.h"
#include "reader.h"
#include "uniqstr.h"

#define YY_USER_INIT					\
  do							\
    {							\
      scanner_cursor.file = current_file;		\
      scanner_cursor.line = 1;				\
      scanner_cursor.column = 1;			\
      code_start = scanner_cursor;			\
    }							\
  while (0)

/* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
int gram_get_lineno (void);
FILE *gram_get_in (void);
FILE *gram_get_out (void);
int gram_get_leng (void);
char *gram_get_text (void);
void gram_set_lineno (int);
void gram_set_in (FILE *);
void gram_set_out (FILE *);
int gram_get_debug (void);
void gram_set_debug (int);
int gram_lex_destroy (void);

/* Location of scanner cursor.  */
boundary scanner_cursor;

static void adjust_location (location *, char const *, size_t);
#define YY_USER_ACTION  adjust_location (loc, gram_text, gram_leng);

static size_t no_cr_read (FILE *, char *, size_t);
#define YY_INPUT(buf, result, size) ((result) = no_cr_read (gram_in, buf, size))


/* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
   keep (to construct ID, STRINGS etc.).  Use the following macros to
   use it.

   Use STRING_GROW to append what has just been matched, and
   STRING_FINISH to end the string (it puts the ending 0).
   STRING_FINISH also stores this string in LAST_STRING, which can be
   used, and which is used by STRING_FREE to free the last string.  */

static struct obstack obstack_for_string;

/* A string representing the most recently saved token.  */
static char *last_string;


#define STRING_GROW   \
  obstack_grow (&obstack_for_string, gram_text, gram_leng)

#define STRING_FINISH					\
  do {							\
    obstack_1grow (&obstack_for_string, '\0');		\
    last_string = obstack_finish (&obstack_for_string);	\
  } while (0)

#define STRING_FREE \
  obstack_free (&obstack_for_string, last_string)

void
scanner_last_string_free (void)
{
  STRING_FREE;
}

/* Within well-formed rules, RULE_LENGTH is the number of values in
   the current rule so far, which says where to find `$0' with respect
   to the top of the stack.  It is not the same as the rule->length in
   the case of mid rule actions.

   Outside of well-formed rules, RULE_LENGTH has an undefined value.  */
static int rule_length;

static void handle_dollar (int token_type, char *cp, location loc);
static void handle_at (int token_type, char *cp, location loc);
static void handle_syncline (char *args);
static unsigned long int scan_integer (char const *p, int base, location loc);
static int convert_ucn_to_byte (char const *hex_text);
static void unexpected_eof (boundary, char const *);
static void unexpected_newline (boundary, char const *);






/* POSIX says that a tag must be both an id and a C union member, but
   historically almost any character is allowed in a tag.  We disallow
   NUL and newline, as this simplifies our implementation.  */
/* Zero or more instances of backslash-newline.  Following GCC, allow
   white space between the backslash and the newline.  */
#line 989 "scan-gram.c"

#define INITIAL 0
#define SC_COMMENT 1
#define SC_LINE_COMMENT 2
#define SC_YACC_COMMENT 3
#define SC_STRING 4
#define SC_CHARACTER 5
#define SC_AFTER_IDENTIFIER 6
#define SC_ESCAPED_STRING 7
#define SC_ESCAPED_CHARACTER 8
#define SC_PRE_CODE 9
#define SC_BRACED_CODE 10
#define SC_PROLOGUE 11
#define SC_EPILOGUE 12

#ifndef YY_NO_UNISTD_H
/* Special case for "unistd.h", since it is non-ANSI. We include it way
 * down here because we want the user's section 1 to have been scanned first.
 * The user has a chance to override it with an option.
 */
/* %if-c-only */
#include <unistd.h>
/* %endif */
/* %if-c++-only */
/* %endif */
#endif

#ifndef YY_EXTRA_TYPE
#define YY_EXTRA_TYPE void *
#endif

/* %if-c-only Reentrant structure and macros (non-C++). */
/* %if-reentrant */
/* %if-reentrant */
/* %endif */
/* %if-bison-bridge */
/* %endif */
/* %endif End reentrant structures and macros. */

/* Macros after this point can all be overridden by user definitions in
 * section 1.
 */

#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int gram_wrap (void );
#else
extern int gram_wrap (void );
#endif
#endif

/* %not-for-header */

/* %ok-for-header */

/* %endif */

#ifndef yytext_ptr
static void yy_flex_strncpy (char *,yyconst char *,int );
#endif

#ifdef YY_NEED_STRLEN
static int yy_flex_strlen (yyconst char * );
#endif

#ifndef YY_NO_INPUT
/* %if-c-only Standard (non-C++) definition */
/* %not-for-header */

#ifdef __cplusplus
static int yyinput (void );
#else
static int input (void );
#endif
/* %ok-for-header */

/* %endif */
#endif

/* %if-c-only */

/* %endif */

/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif

/* Copy whatever the last rule matched to the standard output. */
#ifndef ECHO
/* %if-c-only Standard (non-C++) definition */
/* This used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite().
 */
#define ECHO (void) fwrite( gram_text, gram_leng, 1, gram_out )
/* %endif */
/* %if-c++-only C++ definition */
/* %endif */
#endif

/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
/* %% [5.0] fread()/read() definition of YY_INPUT goes here unless we're doing C++ \ */\
	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
		{ \
		int c = '*'; \
		size_t n; \
		for ( n = 0; n < max_size && \
			     (c = getc( gram_in )) != EOF && c != '\n'; ++n ) \
			buf[n] = (char) c; \
		if ( c == '\n' ) \
			buf[n++] = (char) c; \
		if ( c == EOF && ferror( gram_in ) ) \
			YY_FATAL_ERROR( "input in flex scanner failed" ); \
		result = n; \
		} \
	else \
		{ \
		errno=0; \
		while ( (result = fread(buf, 1, max_size, gram_in))==0 && ferror(gram_in)) \
			{ \
			if( errno != EINTR) \
				{ \
				YY_FATAL_ERROR( "input in flex scanner failed" ); \
				break; \
				} \
			errno=0; \
			clearerr(gram_in); \
			} \
		}\
\
/* %if-c++-only C++ definition \ */\
/* %endif */

#endif

/* No semi-colon after return; correct usage is to write "yyterminate();" -
 * we don't want an extra ';' after the "return" because that will cause
 * some compilers to complain about unreachable statements.
 */
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif

/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif

/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
/* %if-c-only */
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
/* %endif */
/* %if-c++-only */
/* %endif */
#endif

/* %if-tables-serialization structures and prototypes */
/* %not-for-header */

/* %ok-for-header */

/* %not-for-header */

/* %tables-yydmap generated elements */
/* %endif */
/* end tables serialization structures and prototypes */

/* %ok-for-header */

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL_IS_OURS 1
/* %if-c-only Standard (non-C++) definition */

extern int gram_lex (void);

#define YY_DECL int gram_lex (void)
/* %endif */
/* %if-c++-only C++ definition */
/* %endif */
#endif /* !YY_DECL */

/* Code executed at the beginning of each rule, after gram_text and gram_leng
 * have been set up.
 */
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif

/* %% [6.0] YY_RULE_SETUP definition goes here */
#define YY_RULE_SETUP \
	if ( gram_leng > 0 ) \
		YY_CURRENT_BUFFER_LVALUE->yy_at_bol = \
				(gram_text[gram_leng - 1] == '\n'); \
	YY_USER_ACTION

/* %not-for-header */

/** The main scanner function which does all the work.
 */
YY_DECL
{
	register yy_state_type yy_current_state;
	register char *yy_cp, *yy_bp;
	register int yy_act;
    
/* %% [7.0] user's declarations go here */
#line 144 "scan-gram.l"


  /* Nesting level of the current code in braces.  */
  int braces_level IF_LINT (= 0);

  /* Parent context state, when applicable.  */
  int context_state IF_LINT (= 0);

  /* Token type to return, when applicable.  */
  int token_type IF_LINT (= 0);

  /* Location of most recent identifier, when applicable.  */
  location id_loc IF_LINT (= empty_location);

  /* Where containing code started, when applicable.  Its initial
     value is relevant only when gram_lex is invoked in the SC_EPILOGUE
     start condition.  */
  boundary code_start = scanner_cursor;

  /* Where containing comment or string or character literal started,
     when applicable.  */
  boundary token_start IF_LINT (= scanner_cursor);



  /*-----------------------.
  | Scanning white space.  |
  `-----------------------*/

#line 1239 "scan-gram.c"

	if ( (yy_init) )
		{
		(yy_init) = 0;

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

		if ( ! (yy_start) )
			(yy_start) = 1;	/* first start state */

		if ( ! gram_in )
/* %if-c-only */
			gram_in = stdin;
/* %endif */
/* %if-c++-only */
/* %endif */

		if ( ! gram_out )
/* %if-c-only */
			gram_out = stdout;
/* %endif */
/* %if-c++-only */
/* %endif */

		if ( ! YY_CURRENT_BUFFER ) {
			gram_ensure_buffer_stack ();
			YY_CURRENT_BUFFER_LVALUE =
				gram__create_buffer(gram_in,YY_BUF_SIZE );
		}

		gram__load_buffer_state( );
		}

	while ( 1 )		/* loops until end-of-file is reached */
		{
/* %% [8.0] yymore()-related code goes here */
		yy_cp = (yy_c_buf_p);

		/* Support of gram_text. */
		*yy_cp = (yy_hold_char);

		/* yy_bp points to the position in yy_ch_buf of the start of
		 * the current run.
		 */
		yy_bp = yy_cp;

/* %% [9.0] code to set up and find next match goes here */
		yy_current_state = (yy_start);
		yy_current_state += YY_AT_BOL();
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
			if ( yy_accept[yy_current_state] )
				{
				(yy_last_accepting_state) = yy_current_state;
				(yy_last_accepting_cpos) = yy_cp;
				}
			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
				{
				yy_current_state = (int) yy_def[yy_current_state];
				if ( yy_current_state >= 455 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			++yy_cp;
			}
		while ( yy_current_state != 454 );
		yy_cp = (yy_last_accepting_cpos);
		yy_current_state = (yy_last_accepting_state);

yy_find_action:
/* %% [10.0] code to find the action number goes here */
		yy_act = yy_accept[yy_current_state];

		YY_DO_BEFORE_ACTION;

/* %% [11.0] code for gram_lineno update goes here */

do_action:	/* This label is used only to access EOF actions. */

/* %% [12.0] debug code goes here */
		if ( gram__flex_debug )
			{
			if ( yy_act == 0 )
				fprintf( stderr, "--scanner backing up\n" );