calc_flex.c

绘制一元函数曲线的工具 输入C语言语法的函数公式, 即可绘制函数的二维曲线 采用内置编译器和虚拟机(这是调整OK的版本)

#ifndef YY_EXTRA_TYPE
#define YY_EXTRA_TYPE void *
#endif

static int yy_init_globals (void );

/* 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

    static void yyunput (int c,char *buf_ptr  );
    
#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

#ifdef __cplusplus
static int yyinput (void );
#else
static int input (void );
#endif

#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
/* 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

/* 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) \
	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); \
			} \
		}\
\

#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
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif

/* end tables serialization structures and prototypes */

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL_IS_OURS 1

extern int yylex (void);

#define YY_DECL int yylex (void)
#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

#define YY_RULE_SETUP \
	YY_USER_ACTION

/** 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;
    
#line 33 "calc_flex.l"


#line 730 "calc_flex.c"

	if ( !(yy_init) )
		{
		(yy_init) = 1;

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

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

		if ( ! yyin )
			yyin = stdin;

		if ( ! yyout )
			yyout = stdout;

		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 */
		{
		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;

		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 >= 114 )
					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_base[yy_current_state] != 183 );

yy_find_action:
		yy_act = yy_accept[yy_current_state];
		if ( yy_act == 0 )
			{ /* have to back up */
			yy_cp = (yy_last_accepting_cpos);
			yy_current_state = (yy_last_accepting_state);
			yy_act = yy_accept[yy_current_state];
			}

		YY_DO_BEFORE_ACTION;

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

		switch ( yy_act )
	{ /* beginning of action switch */
			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 35 "calc_flex.l"
{ skip_comment(); }
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 37 "calc_flex.l"
{ save_tokenOP(yytext); return(IF); }
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 38 "calc_flex.l"
{ save_tokenOP(yytext); return(ELSE); }
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 39 "calc_flex.l"
{ save_tokenOP(yytext); return(GOTO); }
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 41 "calc_flex.l"
{ save_tokenOP(yytext); return(DO); }
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 42 "calc_flex.l"
{ save_tokenOP(yytext); return(FOR); }
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 43 "calc_flex.l"
{ save_tokenOP(yytext); return(WHILE); }
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 44 "calc_flex.l"
{ save_tokenOP(yytext); return(BREAK); }
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 45 "calc_flex.l"
{ save_tokenOP(yytext); return(CONTI); }
	YY_BREAK
case 10:
YY_RULE_SETUP
#line 47 "calc_flex.l"
{ save_tokenID(yytext); return(IDENTIFIER); }
	YY_BREAK
case 11:
/* rule 11 can match eol */
YY_RULE_SETUP
#line 49 "calc_flex.l"
{ save_tokenCS(yytext); return(CONSTANT_S); }
	YY_BREAK
case 12:
/* rule 12 can match eol */
YY_RULE_SETUP
#line 50 "calc_flex.l"
{ save_tokenCC(yytext); return(CONSTANT_C); }
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 52 "calc_flex.l"
{ save_tokenCH(yytext); return(CONSTANT_I); }
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 53 "calc_flex.l"
{ save_tokenCI(yytext); return(CONSTANT_I); }
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 55 "calc_flex.l"
{ save_tokenCF(yytext); return(CONSTANT_R); }
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 56 "calc_flex.l"
{ save_tokenCF(yytext); return(CONSTANT_R); }
	YY_BREAK
case 17:
YY_RULE_SETUP
#line 57 "calc_flex.l"
{ save_tokenCF(yytext); return(CONSTANT_R); }
	YY_BREAK
case 18:
YY_RULE_SETUP
#line 59 "calc_flex.l"
{ save_tokenAS(ASSADD); return(ASS); }
	YY_BREAK
case 19:
YY_RULE_SETUP
#line 60 "calc_flex.l"
{ save_tokenAS(ASSSUB); return(ASS); }
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 61 "calc_flex.l"
{ save_tokenAS(ASSMUL); return(ASS); }
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 62 "calc_flex.l"
{ save_tokenAS(ASSDIV); return(ASS); }
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 63 "calc_flex.l"
{ save_tokenAS(ASSBAL); return(ASS); }
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 65 "calc_flex.l"
{ save_tokenAS(ASSAND); return(ASS); }
	YY_BREAK
case 24:
YY_RULE_SETUP
#line 66 "calc_flex.l"
{ save_tokenAS(ASSXOR); return(ASS); }
	YY_BREAK
case 25:
YY_RULE_SETUP
#line 67 "calc_flex.l"
{ save_tokenAS(ASSOOR); return(ASS); }
	YY_BREAK
case 26:
YY_RULE_SETUP
#line 69 "calc_flex.l"
{ save_tokenAS(ASSSHL); return(ASS); }
	YY_BREAK
case 27:
YY_RULE_SETUP
#line 70 "calc_flex.l"
{ save_tokenAS(ASSSHR); return(ASS); }
	YY_BREAK
case 28:
YY_RULE_SETUP
#line 72 "calc_flex.l"
{ save_tokenOP(yytext); return(AND); }
	YY_BREAK
case 29:
YY_RULE_SETUP
#line 73 "calc_flex.l"
{ save_tokenOP(yytext); return(OOR); }
	YY_BREAK
case 30:
YY_RULE_SETUP
#line 75 "calc_flex.l"
{ save_tokenOP(yytext); return(CEQ); }
	YY_BREAK
case 31:
YY_RULE_SETUP
#line 76 "calc_flex.l"
{ save_tokenOP(yytext); return(CNE); }
	YY_BREAK
case 32:
YY_RULE_SETUP
#line 78 "calc_flex.l"
{ save_tokenOP(yytext); return(CGE); }
	YY_BREAK
case 33:
YY_RULE_SETUP
#line 79 "calc_flex.l"
{ save_tokenOP(yytext); return(CLE); }
	YY_BREAK
case 34:
YY_RULE_SETUP
#line 81 "calc_flex.l"
{ save_tokenOP(yytext); return(SHL); }
	YY_BREAK
case 35:
YY_RULE_SETUP
#line 82 "calc_flex.l"
{ save_tokenOP(yytext); return(SHR); }
	YY_BREAK
case 36:
YY_RULE_SETUP
#line 84 "calc_flex.l"
{ save_tokenOP(yytext); return(INC); }
	YY_BREAK
case 37:
YY_RULE_SETUP
#line 85 "calc_flex.l"
{ save_tokenOP(yytext); return(DEC); }
	YY_BREAK
case 38:
YY_RULE_SETUP
#line 87 "calc_flex.l"
{ save_tokenOP(yytext); return('+'); }
	YY_BREAK
case 39:
YY_RULE_SETUP
#line 88 "calc_flex.l"
{ save_tokenOP(yytext); return('-'); }
	YY_BREAK
case 40:
YY_RULE_SETUP
#line 89 "calc_flex.l"
{ save_tokenOP(yytext); return('*'); }
	YY_BREAK
case 41:
YY_RULE_SETUP
#line 90 "calc_flex.l"
{ save_tokenOP(yytext); return('/'); }
	YY_BREAK
case 42:
YY_RULE_SETUP
#line 91 "calc_flex.l"
{ save_tokenOP(yytext); return('%'); }
	YY_BREAK
case 43:
YY_RULE_SETUP
#line 93 "calc_flex.l"
{ save_tokenOP(yytext); return('&'); }
	YY_BREAK
case 44:
YY_RULE_SETUP
#line 94 "calc_flex.l"
{ save_tokenOP(yytext); return('^'); }
	YY_BREAK
case 45:
YY_RULE_SETUP
#line 95 "calc_flex.l"
{ save_tokenOP(yytext); return('|'); }
	YY_BREAK
case 46:
YY_RULE_SETUP
#line 97 "calc_flex.l"
{ save_tokenOP(yytext); return('!'); }
	YY_BREAK
case 47:
YY_RULE_SETUP
#line 98 "calc_flex.l"
{ save_tokenOP(yytext); return('~'); }
	YY_BREAK
case 48:
YY_RULE_SETUP
#line 100 "calc_flex.l"
{ save_tokenOP(yytext); return('('); }
	YY_BREAK
case 49:
YY_RULE_SETUP
#line 101 "calc_flex.l"
{ save_tokenOP(yytext); return(')'); }
	YY_BREAK
case 50:
YY_RULE_SETUP
#line 103 "calc_flex.l"
{ save_tokenOP(yytext); return('['); }
	YY_BREAK
case 51:
YY_RULE_SETUP
#line 104 "calc_flex.l"
{ save_tokenOP(yytext); return(']'); }
	YY_BREAK
case 52:
YY_RULE_SETUP
#line 106 "calc_flex.l"
{ save_tokenOP(yytext); return('{'); }
	YY_BREAK
case 53:
YY_RULE_SETUP
#line 107 "calc_flex.l"
{ save_tokenOP(yytext); return('}'); }
	YY_BREAK
case 54:
YY_RULE_SETUP
#line 109 "calc_flex.l"
{ save_tokenOP(yytext); return('>'); }
	YY_BREAK
case 55:
YY_RULE_SETUP
#line 110 "calc_flex.l"
{ save_tokenOP(yytext); return('<'); }
	YY_BREAK
case 56:
YY_RULE_SETUP
#line 112 "calc_flex.l"
{ save_tokenOP(yytext); return(','); }
	YY_BREAK
case 57:
YY_RULE_SETUP
#line 113 "calc_flex.l"
{ save_tokenOP(yytext); return(';'); }
	YY_BREAK
case 58:
YY_RULE_SETUP
#line 114 "calc_flex.l"
{ save_tokenOP(yytext); return('.'); }
	YY_BREAK
case 59:
YY_RULE_SETUP
#line 115 "calc_flex.l"
{ save_tokenAS(ASSIGN); return(ASS); }
	YY_BREAK
case 60:
YY_RULE_SETUP
#line 116 "calc_flex.l"
{ save_tokenOP(yytext); return(':'); }
	YY_BREAK
case 61:
/* rule 61 can match eol */
YY_RULE_SETUP
#line 118 "calc_flex.l"
{ skip_spaceSS(); }
	YY_BREAK
case 62:
YY_RULE_SETUP
#line 120 "calc_flex.l"
ECHO;
	YY_BREAK
#line 1126 "calc_flex.c"
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(  );