calc++-scanner.cc

GNU的词法/语法分析器bison源码

        4,    5,    6,    7,    8,    9,    4,   10,    4,   15,
       13,   12,   11,   14,   13,   12,   11,   16,    3,   16,
       16,   16,   16,   16,   16,   16,   16,   16
    } ;

static yyconst flex_int16_t yy_chk[29] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    1,   17,
       13,   12,   11,    9,    8,    6,    5,    3,   16,   16,
       16,   16,   16,   16,   16,   16,   16,   16
    } ;

static yy_state_type yy_last_accepting_state;
static char *yy_last_accepting_cpos;

extern int yy_flex_debug;
int yy_flex_debug = 1;

static yyconst flex_int16_t yy_rule_linenum[8] =
    {   0,
       23,   24,   26,   27,   28,   36,   37
    } ;

/* The intent behind this definition is that it'll catch
 * any uses of REJECT which flex missed.
 */
#define REJECT reject_used_but_not_detected
#define yymore() yymore_used_but_not_detected
#define YY_MORE_ADJ 0
#define YY_RESTORE_YY_MORE_OFFSET
char *yytext;
#line 1 "./calc++-scanner.ll"
#line 2 "./calc++-scanner.ll"
# include <cstdlib>
# include <errno.h>
# include <limits.h>
# include <string>
# include "calc++-driver.hh"
# include "calc++-parser.hh"
#line 17 "./calc++-scanner.ll"
# define YY_USER_ACTION  yylloc->columns (yyleng);
#line 539 "calc++-scanner.cc"

#define INITIAL 0

#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 yywrap (void );
#else
extern int yywrap (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( yytext, yyleng, 1, yyout )
/* %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( yyin )) != EOF && c != '\n'; ++n ) \
			buf[n] = (char) c; \
		if ( c == '\n' ) \
			buf[n++] = (char) c; \
		if ( c == EOF && ferror( yyin ) ) \
			YY_FATAL_ERROR( "input in flex scanner failed" ); \
		result = n; \
		} \
	else \
		{ \
		errno=0; \
		while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
			{ \
			if( errno != EINTR) \
				{ \
				YY_FATAL_ERROR( "input in flex scanner failed" ); \
				break; \
				} \
			errno=0; \
			clearerr(yyin); \
			} \
		}\
\
/* %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 yylex (void);

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

/* Code executed at the beginning of each rule, after yytext and yyleng
 * 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 \
	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 19 "./calc++-scanner.ll"


  yylloc->step ();

#line 749 "calc++-scanner.cc"

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

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

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

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

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

		if ( ! YY_CURRENT_BUFFER ) {
			yyensure_buffer_stack ();
			YY_CURRENT_BUFFER_LVALUE =
				yy_create_buffer(yyin,YY_BUF_SIZE );
		}

		yy_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 yytext. */
		*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_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 >= 17 )
					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 != 16 );
		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 yylineno update goes here */

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

/* %% [12.0] debug code goes here */
		if ( yy_flex_debug )
			{
			if ( yy_act == 0 )
				fprintf( stderr, "--scanner backing up\n" );
			else if ( yy_act < 8 )
				fprintf( stderr, "--accepting rule at line %ld (\"%s\")\n",
				         (long)yy_rule_linenum[yy_act], yytext );
			else if ( yy_act == 8 )
				fprintf( stderr, "--accepting default rule (\"%s\")\n",
				         yytext );
			else if ( yy_act == 9 )
				fprintf( stderr, "--(end of buffer or a NUL)\n" );
			else
				fprintf( stderr, "--EOF (start condition %d)\n", YY_START );
			}

		switch ( yy_act )
	{ /* beginning of action switch */
/* %% [13.0] actions go here */
			case 0: /* must back up */
			/* undo the effects of YY_DO_BEFORE_ACTION */
			*yy_cp = (yy_hold_char);
			yy_cp = (yy_last_accepting_cpos);
			yy_current_state = (yy_last_accepting_state);
			goto yy_find_action;

case 1:
YY_RULE_SETUP
#line 23 "./calc++-scanner.ll"
yylloc->step ();
	YY_BREAK
case 2:
/* rule 2 can match eol */
YY_RULE_SETUP
#line 24 "./calc++-scanner.ll"
yylloc->lines (yyleng); yylloc->step ();
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 26 "./calc++-scanner.ll"
return yytext[0];
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 27 "./calc++-scanner.ll"
return TOKEN_ASSIGN;
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 28 "./calc++-scanner.ll"
{
  errno = 0;
  long n = strtol (yytext, NULL, 10);
  if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE))
    driver.error (*yylloc, "integer is out of range");
  yylval->ival = n;
  return TOKEN_NUMBER;
}
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 36 "./calc++-scanner.ll"
yylval->sval = new std::string (yytext); return TOKEN_IDENTIFIER;
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 37 "./calc++-scanner.ll"
driver.error (*yylloc, "invalid character");
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 38 "./calc++-scanner.ll"
ECHO;
	YY_BREAK
#line 907 "calc++-scanner.cc"
case YY_STATE_EOF(INITIAL):
	yyterminate();

	case YY_END_OF_BUFFER:
		{
		/* Amount of text matched not including the EOB char. */
		int yy_amount_of_matched_text = (int) (yy_cp - (yytext_ptr)) - 1;

		/* Undo the effects of YY_DO_BEFORE_ACTION. */
		*yy_cp = (yy_hold_char);
		YY_RESTORE_YY_MORE_OFFSET

		if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
			{
			/* We're scanning a new file or input source.  It's
			 * possible that this happened because the user
			 * just pointed yyin at a new source and called
			 * yylex().  If so, then we have to assure
			 * consistency between YY_CURRENT_BUFFER and our
			 * globals.  Here is the right place to do so, because
			 * this is the first action (other than possibly a
			 * back-up) that will match for the new input source.
			 */
			(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
			YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin;
			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
			}

		/* Note that here we test for yy_c_buf_p "<=" to the position
		 * of the first EOB in the buffer, since yy_c_buf_p will
		 * already have been incremented past the NUL character
		 * (since all states make transitions on EOB to the
		 * end-of-buffer state).  Contrast this with the test
		 * in input().
		 */
		if ( (yy_c_buf_p) <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
			{ /* This was really a NUL. */
			yy_state_type yy_next_state;

			(yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text;

			yy_current_state = yy_get_previous_state(  );

			/* Okay, we're now positioned to make the NUL
			 * transition.  We couldn't have
			 * yy_get_previous_state() go ahead and do it
			 * for us because it doesn't know how to deal
			 * with the possibility of jamming (and we don't
			 * want to build jamming into it because then it
			 * will run more slowly).
			 */

			yy_next_state = yy_try_NUL_trans( yy_current_state );

			yy_bp = (yytext_ptr) + YY_MORE_ADJ;

			if ( yy_next_state )
				{
				/* Consume the NUL. */
				yy_cp = ++(yy_c_buf_p);
				yy_current_state = yy_next_state;
				goto yy_match;
				}

			else
				{
/* %% [14.0] code to do back-up for compressed tables and set up yy_cp goes here */
				yy_cp = (yy_last_accepting_cpos);
				yy_current_state = (yy_last_accepting_state);
				goto yy_find_action;
				}
			}

		else switch ( yy_get_next_buffer(  ) )
			{
			case EOB_ACT_END_OF_FILE:
				{
				(yy_did_buffer_switch_on_eof) = 0;

				if ( yywrap( ) )
					{
					/* Note: because we've taken care in
					 * yy_get_next_buffer() to have set up
					 * yytext, we can now set up
					 * yy_c_buf_p so that if some total
					 * hoser (like flex itself) wants to