lex.yy.c

一个小计算器的实现(编译原理),用Lex和bison

/* A lexical scanner generated by flex */

/* Scanner skeleton version:
 * $Header: /home/daffy/u0/vern/flex/RCS/flex.skl,v 2.91 96/09/10 16:58:48 vern Exp $
 */

#define FLEX_SCANNER
#define YY_FLEX_MAJOR_VERSION 2
#define YY_FLEX_MINOR_VERSION 5

#include <stdio.h>
 


/* cfront 1.2 defines "c_plusplus" instead of "__cplusplus" */
#ifdef c_plusplus
#ifndef __cplusplus
#define __cplusplus
#endif
#endif


#ifdef __cplusplus

#include <stdlib.h>

/* Use prototypes in function declarations. */
#define YY_USE_PROTOS

/* The "const" storage-class-modifier is valid. */
#define YY_USE_CONST

#else	/* ! __cplusplus */

#if __STDC__

#define YY_USE_PROTOS
#define YY_USE_CONST

#endif	/* __STDC__ */
#endif	/* ! __cplusplus */

#ifdef __TURBOC__
 #pragma warn -rch
 #pragma warn -use
#include <io.h>
#include <stdlib.h>
#define YY_USE_CONST
#define YY_USE_PROTOS
#endif

#ifdef YY_USE_CONST
#define yyconst const
#else
#define yyconst
#endif


#ifdef YY_USE_PROTOS
#define YY_PROTO(proto) proto
#else
#define YY_PROTO(proto) ()
#endif

/* Returned upon end-of-file. */
#define YY_NULL 0

/* Promotes a possibly negative, possibly signed char to an unsigned
 * integer for use as an array index.  If the signed char is negative,
 * we want to instead treat it as an 8-bit unsigned char, hence the
 * double cast.
 */
#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)

/* Enter a start condition.  This macro really ought to take a parameter,
 * but we do it the disgusting crufty way forced on us by the ()-less
 * definition of BEGIN.
 */
#define BEGIN yy_start = 1 + 2 *

/* Translate the current start state into a value that can be later handed
 * to BEGIN to return to the state.  The YYSTATE alias is for lex
 * compatibility.
 */
#define YY_START ((yy_start - 1) / 2)
#define YYSTATE YY_START

/* Action number for EOF rule of a given start state. */
#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)

/* Special action meaning "start processing a new file". */
#define YY_NEW_FILE yyrestart( yyin )

#define YY_END_OF_BUFFER_CHAR 0

/* Size of default input buffer. */
#define YY_BUF_SIZE 16384

typedef struct yy_buffer_state *YY_BUFFER_STATE;

extern int yyleng;
extern FILE *yyin, *yyout;

#define EOB_ACT_CONTINUE_SCAN 0
#define EOB_ACT_END_OF_FILE 1
#define EOB_ACT_LAST_MATCH 2

/* The funky do-while in the following #define is used to turn the definition
 * int a single C statement (which needs a semi-colon terminator).  This
 * avoids problems with code like:
 *
 * 	if ( condition_holds )
 *		yyless( 5 );
 *	else
 *		do_something_else();
 *
 * Prior to using the do-while the compiler would get upset at the
 * "else" because it interpreted the "if" statement as being all
 * done when it reached the ';' after the yyless() call.
 */

/* Return all but the first 'n' matched characters back to the input stream. */

#define yyless(n) \
	do \
		{ \
		/* Undo effects of setting up yytext. */ \
		*yy_cp = yy_hold_char; \
		YY_RESTORE_YY_MORE_OFFSET \
		yy_c_buf_p = yy_cp = yy_bp + n - YY_MORE_ADJ; \
		YY_DO_BEFORE_ACTION; /* set up yytext again */ \
		} \
	while ( 0 )

#define unput(c) yyunput( c, yytext_ptr )

/* The following is because we cannot portably get our hands on size_t
 * (without autoconf's help, which isn't available because we want
 * flex-generated scanners to compile on their own).
 */
typedef unsigned int yy_size_t;


struct yy_buffer_state
	{
	FILE *yy_input_file;

	char *yy_ch_buf;		/* input buffer */
	char *yy_buf_pos;		/* current position in input buffer */

	/* Size of input buffer in bytes, not including room for EOB
	 * characters.
	 */
	yy_size_t yy_buf_size;

	/* Number of characters read into yy_ch_buf, not including EOB
	 * characters.
	 */
	int yy_n_chars;

	/* Whether we "own" the buffer - i.e., we know we created it,
	 * and can realloc() it to grow it, and should free() it to
	 * delete it.
	 */
	int yy_is_our_buffer;

	/* Whether this is an "interactive" input source; if so, and
	 * if we're using stdio for input, then we want to use getc()
	 * instead of fread(), to make sure we stop fetching input after
	 * each newline.
	 */
	int yy_is_interactive;

	/* Whether we're considered to be at the beginning of a line.
	 * If so, '^' rules will be active on the next match, otherwise
	 * not.
	 */
	int yy_at_bol;

	/* Whether to try to fill the input buffer when we reach the
	 * end of it.
	 */
	int yy_fill_buffer;

	int yy_buffer_status;
#define YY_BUFFER_NEW 0
#define YY_BUFFER_NORMAL 1
	/* When an EOF's been seen but there's still some text to process
	 * then we mark the buffer as YY_EOF_PENDING, to indicate that we
	 * shouldn't try reading from the input source any more.  We might
	 * still have a bunch of tokens to match, though, because of
	 * possible backing-up.
	 *
	 * When we actually see the EOF, we change the status to "new"
	 * (via yyrestart()), so that the user can continue scanning by
	 * just pointing yyin at a new input file.
	 */
#define YY_BUFFER_EOF_PENDING 2
	};

static YY_BUFFER_STATE yy_current_buffer = 0;

/* We provide macros for accessing buffer states in case in the
 * future we want to put the buffer states in a more general
 * "scanner state".
 */
#define YY_CURRENT_BUFFER yy_current_buffer


/* yy_hold_char holds the character lost when yytext is formed. */
static char yy_hold_char;

static int yy_n_chars;		/* number of characters read into yy_ch_buf */


int yyleng;

/* Points to current character in buffer. */
static char *yy_c_buf_p = (char *) 0;
static int yy_init = 1;		/* whether we need to initialize */
static int yy_start = 0;	/* start state number */

/* Flag which is used to allow yywrap()'s to do buffer switches
 * instead of setting up a fresh yyin.  A bit of a hack ...
 */
static int yy_did_buffer_switch_on_eof;

void yyrestart YY_PROTO(( FILE *input_file ));

void yy_switch_to_buffer YY_PROTO(( YY_BUFFER_STATE new_buffer ));
void yy_load_buffer_state YY_PROTO(( void ));
YY_BUFFER_STATE yy_create_buffer YY_PROTO(( FILE *file, int size ));
void yy_delete_buffer YY_PROTO(( YY_BUFFER_STATE b ));
void yy_init_buffer YY_PROTO(( YY_BUFFER_STATE b, FILE *file ));
void yy_flush_buffer YY_PROTO(( YY_BUFFER_STATE b ));
#define YY_FLUSH_BUFFER yy_flush_buffer( yy_current_buffer )

YY_BUFFER_STATE yy_scan_buffer YY_PROTO(( char *base, yy_size_t size ));
YY_BUFFER_STATE yy_scan_string YY_PROTO(( yyconst char *yy_str ));
YY_BUFFER_STATE yy_scan_bytes YY_PROTO(( yyconst char *bytes, int len ));

static void *yy_flex_alloc YY_PROTO(( yy_size_t ));
static void *yy_flex_realloc YY_PROTO(( void *, yy_size_t ));
static void yy_flex_free YY_PROTO(( void * ));

#define yy_new_buffer yy_create_buffer

#define yy_set_interactive(is_interactive) \
	{ \
	if ( ! yy_current_buffer ) \
		yy_current_buffer = yy_create_buffer( yyin, YY_BUF_SIZE ); \
	yy_current_buffer->yy_is_interactive = is_interactive; \
	}

#define yy_set_bol(at_bol) \
	{ \
	if ( ! yy_current_buffer ) \
		yy_current_buffer = yy_create_buffer( yyin, YY_BUF_SIZE ); \
	yy_current_buffer->yy_at_bol = at_bol; \
	}

#define YY_AT_BOL() (yy_current_buffer->yy_at_bol)

typedef unsigned char YY_CHAR;
FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
typedef int yy_state_type;
extern char *yytext;
#define yytext_ptr yytext

static yy_state_type yy_get_previous_state YY_PROTO(( void ));
static yy_state_type yy_try_NUL_trans YY_PROTO(( yy_state_type current_state ));
static int yy_get_next_buffer YY_PROTO(( void ));
static void yy_fatal_error YY_PROTO(( yyconst char msg[] ));

/* Done after the current pattern has been matched and before the
 * corresponding action - sets up yytext.
 */
#define YY_DO_BEFORE_ACTION \
	yytext_ptr = yy_bp; \
	yyleng = (int) (yy_cp - yy_bp); \
	yy_hold_char = *yy_cp; \
	*yy_cp = '\0'; \
	yy_c_buf_p = yy_cp;

#define YY_NUM_RULES 65
#define YY_END_OF_BUFFER 66
static yyconst short int yy_accept[162] =
    {   0,
        0,    0,    0,    0,   66,   64,   62,   63,   64,    1,
       53,   64,   53,   53,   53,   47,   47,   53,   53,   53,
       46,   51,   52,   46,   46,   46,   46,   46,   46,   46,
       46,   46,   46,   46,   46,   46,   46,   64,    5,   65,
        4,    5,   62,   57,   58,   60,   61,   44,   45,   48,
       49,    0,   48,   47,   55,   56,   54,   46,   46,   46,
       46,   46,   46,   46,   46,   46,   46,   46,   46,   46,
       46,   46,   46,   14,   46,   46,   46,   22,   46,   46,
       46,   46,   46,   46,   46,   46,   59,    3,    2,   48,
       50,   48,   46,   46,   46,   46,   46,   21,   32,   25,

       46,   46,   46,   46,   34,   46,   46,   13,   46,   26,
        6,   46,   37,   46,   27,   46,   46,   39,   46,   46,
       42,   46,   28,   29,   30,   31,   46,   33,   46,   15,
       46,   17,   35,   46,   46,   24,   23,   46,    9,   46,
       18,   40,   41,   46,   46,   43,   46,   20,   46,   19,
        7,   36,   38,   16,   46,   46,   12,    8,   10,   11,
        0
    } ;

static yyconst int yy_ec[256] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    2,    4,    5,    1,    1,    6,    7,    1,    6,
        6,    8,    9,    6,   10,   11,   12,   13,   14,   15,
       15,   15,   15,   15,   15,   16,   16,    1,    6,   17,
       18,   19,    1,    1,   20,   20,   20,   20,   20,   20,
       21,   21,   21,   21,   21,   21,   21,   21,   21,   21,
       21,   21,   21,   21,   21,   21,   21,   22,   21,   21,
       23,   24,   25,    1,    1,    1,   26,   27,   28,   29,

       30,   31,   32,   33,   34,   21,   21,   35,   21,   36,
       37,   38,   39,   40,   41,   42,   43,   21,   44,   45,
       21,   21,    6,   46,    6,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,

        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1
    } ;

static yyconst int yy_meta[47] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    2,    2,    2,    2,    1,    1,    1,    2,
        3,    3,    1,    1,    1,    2,    2,    2,    2,    2,
        2,    3,    3,    3,    3,    3,    3,    3,    3,    3,
        3,    3,    3,    3,    3,    1
    } ;

static yyconst short int yy_base[165] =
    {   0,
        0,    0,   44,   45,  204,  205,  201,  205,  184,  205,
      205,  194,  191,  189,   43,   43,   48,  180,  179,  178,
        0,  205,  205,   25,   40,   41,   39,   46,  165,   49,
       52,  166,  153,  149,   48,  165,  157,  143,  205,  205,
      205,   55,  186,  205,  205,  205,  205,  205,  205,   85,
       81,    0,   89,   95,  205,  205,  205,    0,  150,  152,
      159,  150,   77,  142,  154,  138,  139,  153,   78,  151,
      140,  136,   78,    0,  133,  133,   83,    0,  131,  138,
      137,  134,  129,  128,  131,  132,  205,  205,  205,  111,
        0,  115,  124,  128,  127,  127,  135,    0,  127,    0,

      132,  128,  116,  114,    0,  114,   95,    0,  116,    0,
        0,  111,  138,  119,    0,  114,  107,  115,   99,   99,
      107,  104,    0,    0,    0,    0,   98,    0,  102,    0,
      106,    0,    0,   93,   94,    0,    0,  109,    0,   78,
        0,    0,    0,   81,   86,    0,   62,    0,   61,    0,
        0,    0,    0,    0,   44,   31,    0,    0,    0,    0,
      205,  142,  144,   50
    } ;

static yyconst short int yy_def[165] =
    {   0,
      161,    1,  162,  162,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      163,  161,  161,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  164,  161,  161,  161,  161,  161,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  161,  161,  161,  161,
      164,  161,  163,  163,  163,  163,  163,  163,  163,  163,

      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
      163,  163,  163,  163,  163,  163,  163,  163,  163,  163,
        0,  161,  161,  161
    } ;

static yyconst short int yy_nxt[252] =
    {   0,
        6,    7,    8,    9,   10,   11,   12,   11,   13,   14,
       11,   15,   16,   17,   17,   17,   18,   19,   20,   21,
       21,   21,   22,    6,   23,   24,   21,   25,   26,   27,
       28,   21,   29,   30,   31,   21,   32,   33,   34,   21,
       35,   36,   21,   37,   21,   38,   40,   40,   41,   41,
       48,   91,   59,   50,   49,   51,   51,   51,   53,   88,
       54,   54,   54,   54,   52,   60,   61,   42,   42,   62,
       65,   70,  160,   67,   63,  159,   64,   66,   68,   74,
       71,   82,   72,   69,   75,   76,   83,   52,   77,   84,
      158,  157,   78,   51,   51,   51,   89,   90,   90,   90,

       90,   92,   92,   92,   92,   53,   97,   54,   54,   54,
       54,  104,  109,  156,  113,  105,  155,   98,  114,  154,
      134,  153,  110,   90,   90,   90,   90,   92,   92,   92,
       92,  135,  144,  152,  151,  150,  149,  148,  147,  146,
      143,  145,   39,   39,   39,   58,   58,  142,  141,  140,
      139,  138,  137,  136,  133,  132,  131,  130,  129,  128,
      127,  126,  125,  124,  123,  122,  121,  120,  119,  118,
      117,  116,  115,  112,  111,  108,  107,  106,  103,  102,
      101,  100,   99,   96,   95,   94,   93,   43,   87,   86,
       85,   81,   80,   79,   73,   57,   56,   55,   47,   46,

       45,   44,   43,  161,    5,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161
    } ;

static yyconst short int yy_chk[252] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    3,    4,    3,    4,
       15,  164,   24,   16,   15,   16,   16,   16,   17,   42,
       17,   17,   17,   17,   16,   24,   24,    3,    4,   25,
       26,   28,  156,   27,   25,  155,   25,   26,   27,   30,
       28,   35,   28,   27,   30,   31,   35,   16,   31,   35,
      149,  147,   31,   51,   51,   51,   42,   50,   50,   50,

       50,   53,   53,   53,   53,   54,   63,   54,   54,   54,
       54,   69,   73,  145,   77,   69,  144,   63,   77,  140,
      107,  138,   73,   90,   90,   90,   90,   92,   92,   92,
       92,  107,  120,  135,  134,  131,  129,  127,  122,  121,
      119,  120,  162,  162,  162,  163,  163,  118,  117,  116,
      114,  113,  112,  109,  106,  104,  103,  102,  101,   99,
       97,   96,   95,   94,   93,   86,   85,   84,   83,   82,
       81,   80,   79,   76,   75,   72,   71,   70,   68,   67,
       66,   65,   64,   62,   61,   60,   59,   43,   38,   37,
       36,   34,   33,   32,   29,   20,   19,   18,   14,   13,

       12,    9,    7,    5,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161,  161,  161,  161,  161,  161,  161,  161,  161,  161,
      161
    } ;

static yy_state_type yy_last_accepting_state;
static char *yy_last_accepting_cpos;

/* 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 "nepc.l"
#define INITIAL 0
#line 2 "nepc.l"

#include "nepc.tab.h"
#include "nepc.h"
 static int input();
#define ASTRING 1

#line 479 "lex.yy.c"

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

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

#ifndef YY_NO_UNPUT
static void yyunput YY_PROTO(( int c, char *buf_ptr ));
#endif

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

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

#ifndef YY_NO_INPUT
#ifdef __cplusplus
static int yyinput YY_PROTO(( void ));
#else