scan.c

关系型数据库 Postgresql 6.5.2

#ifdef  YY_READ_BUF_SIZE
#undef  YY_READ_BUF_SIZE
#endif
#define YY_READ_BUF_SIZE	MAX_PARSE_BUFFER

#ifdef  YY_READ_BUF_SIZE
#undef  YY_READ_BUF_SIZE
#endif
#define YY_READ_BUF_SIZE	MAX_PARSE_BUFFER

extern char *parseString;
static char *parseCh;

/* some versions of lex define this as a macro */
#if defined(yywrap)
#undef yywrap
#endif /* yywrap */

#if defined(FLEX_SCANNER)
/* MAX_PARSE_BUFFER is defined in miscadmin.h */
#define YYLMAX MAX_PARSE_BUFFER
#define YY_NO_UNPUT
static int myinput(char* buf, int max);
#undef YY_INPUT
#define YY_INPUT(buf,result,max) {result = myinput(buf,max);}
#else
#undef input
int input();
#undef unput
void unput(char);
#endif /* FLEX_SCANNER */

extern YYSTYPE yylval;

int llen;
char literal[MAX_PARSE_BUFFER];

/* OK, here is a short description of lex/flex rules behavior.
 * The longest pattern which matches an input string is always chosen.
 * For equal-length patterns, the first occurring in the rules list is chosen.
 * INITIAL is the starting condition, to which all non-conditional rules apply.
 * When in an exclusive condition, only those rules defined for that condition apply.
 *
 * Exclusive states change parsing rules while the state is active.
 * There are exclusive states for quoted strings, extended comments,
 *  and to eliminate parsing troubles for numeric strings.
 * Exclusive states:
 *  <xb> binary numeric string - thomas 1997-11-16
 *  <xc> extended C-style comments - tgl 1997-07-12
 *  <xd> delimited identifiers (double-quoted identifiers) - tgl 1997-10-27
 *  <xh> hexadecimal numeric string - thomas 1997-11-16
 *  <xm> numeric strings with embedded minus sign - tgl 1997-09-05
 *  <xq> quoted strings - tgl 1997-07-30
 *
 * The "extended comment" syntax closely resembles allowable operator syntax.
 * So, when in condition <xc>, only strings which would terminate the
 *  "extended comment" trigger any action other than "ignore".
 * Be sure to match _any_ candidate comment, including those with appended
 *	operator-like symbols. - thomas 1997-07-14
 */
#define xb 1

#define xc 2

#define xd 3

#define xh 4

#define xm 5

#define xq 6

/* Binary number
 */
/* Hexadecimal number
 */
/* Extended quote
 * xqdouble implements SQL92 embedded quote
 * xqcat allows strings to cross input lines
 * Note: reduction of '' and \ sequences to output text is done in scanstr(),
 * not by rules here.
 */
/* Delimited quote
 * Allows embedded spaces and other special characters into identifiers.
 */
/* Comments
 * Ignored by the scanner and parser.
 */
/*
real			[\-]?(((({digit}*\.{digit}+)|({digit}+\.{digit}*))([Ee][-+]?{digit}+)?)|({digit}+[Ee][-+]?{digit}+))
*/
/* DO NOT PUT ANY COMMENTS IN THE FOLLOWING SECTION.
 * AT&T lex does not properly handle C-style comments in this second lex block.
 * So, put comments here. tgl - 1997-09-08
 *
 * Quoted strings must allow some special characters such as single-quote
 *  and newline.
 * Embedded single-quotes are implemented both in the SQL/92-standard
 *  style of two adjacent single quotes "''" and in the Postgres/Java style
 *  of escaped-quote "\'".
 * Other embedded escaped characters are matched explicitly and the leading
 *  backslash is dropped from the string. - thomas 1997-09-24
 */
#line 688 "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
static int input YY_PROTO(( void ));
#endif
#endif

#if YY_STACK_USED
static int yy_start_stack_ptr = 0;
static int yy_start_stack_depth = 0;
static int *yy_start_stack = 0;
#ifndef YY_NO_PUSH_STATE
static void yy_push_state YY_PROTO(( int new_state ));
#endif
#ifndef YY_NO_POP_STATE
static void yy_pop_state YY_PROTO(( void ));
#endif
#ifndef YY_NO_TOP_STATE
static int yy_top_state YY_PROTO(( void ));
#endif

#else
#define YY_NO_PUSH_STATE 1
#define YY_NO_POP_STATE 1
#define YY_NO_TOP_STATE 1
#endif

#ifdef YY_MALLOC_DECL
YY_MALLOC_DECL
#else
#if __STDC__
#ifndef __cplusplus
#include <stdlib.h>
#endif
#else
/* Just try to get by without declaring the routines.  This will fail
 * miserably on non-ANSI systems for which sizeof(size_t) != sizeof(int)
 * or sizeof(void*) != sizeof(int).
 */
#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->yy_is_interactive ) \
		{ \
		int c = '*', 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 if ( ((result = fread( buf, 1, max_size, yyin )) == 0) \
		  && ferror( yyin ) ) \
		YY_FATAL_ERROR( "input in flex scanner failed" );
#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

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL int yylex YY_PROTO(( void ))
#endif

/* 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

YY_DECL
	{
	register yy_state_type yy_current_state;
	register char *yy_cp, *yy_bp;
	register int yy_act;

#line 191 "scan.l"

#line 841 "lex.yy.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 ( ! yyin )
			yyin = stdin;

		if ( ! yyout )
			yyout = stdout;

		if ( ! yy_current_buffer )
			yy_current_buffer =
				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_state_ptr = yy_state_buf;
		*yy_state_ptr++ = yy_current_state;
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*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 >= 133 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			*yy_state_ptr++ = yy_current_state;
			++yy_cp;
			}
		while ( yy_base[yy_current_state] != 466 );

yy_find_action:
		yy_current_state = *--yy_state_ptr;
		yy_lp = yy_accept[yy_current_state];
find_rule: /* we branch to this label when backing up */
		for ( ; ; ) /* until we find what rule we matched */
			{
			if ( yy_lp && yy_lp < yy_accept[yy_current_state + 1] )
				{
				yy_act = yy_acclist[yy_lp];
				if ( yy_act & YY_TRAILING_HEAD_MASK ||
				     yy_looking_for_trail_begin )
					{
					if ( yy_act == yy_looking_for_trail_begin )
						{
						yy_looking_for_trail_begin = 0;
						yy_act &= ~YY_TRAILING_HEAD_MASK;
						break;
						}
					}
				else if ( yy_act & YY_TRAILING_MASK )
					{
					yy_looking_for_trail_begin = yy_act & ~YY_TRAILING_MASK;
					yy_looking_for_trail_begin |= YY_TRAILING_HEAD_MASK;
					}
				else
					{
					yy_full_match = yy_cp;
					yy_full_state = yy_state_ptr;
					yy_full_lp = yy_lp;
					break;
					}
				++yy_lp;
				goto find_rule;
				}
			--yy_cp;
			yy_current_state = *--yy_state_ptr;
			yy_lp = 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 1:
YY_RULE_SETUP
#line 192 "scan.l"
{ /* ignore */ }
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 194 "scan.l"
{ /* ignore */ }
	YY_BREAK
case 3:
#line 197 "scan.l"
case 4:
YY_RULE_SETUP
#line 197 "scan.l"
{ BEGIN(xc); }
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 199 "scan.l"
{ BEGIN(INITIAL); }
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 201 "scan.l"
{ /* ignore */ }
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 203 "scan.l"
{
					BEGIN(xb);
					llen = 0;
					*literal = '\0';
				}
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 208 "scan.l"
{
					char* endptr;

					BEGIN(INITIAL);
					errno = 0;
					yylval.ival = strtol((char *)literal,&endptr,2);
					if (*endptr != '\0' || errno == ERANGE)
						elog(ERROR,"Bad binary integer input '%s'",literal);
					return ICONST;
				}
	YY_BREAK
case 9:
#line 219 "scan.l"
case 10:
YY_RULE_SETUP
#line 219 "scan.l"
{
					if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1))
						elog(ERROR,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
					memcpy(literal+llen, yytext, yyleng+1);
					llen += yyleng;
				}
	YY_BREAK
case 11:
#line 226 "scan.l"
case 12:
YY_RULE_SETUP
#line 226 "scan.l"
{
				}
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 229 "scan.l"
{
					BEGIN(xh);
					llen = 0;
					*literal = '\0';
				}
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 234 "scan.l"
{
					char* endptr;

					BEGIN(INITIAL);
					errno = 0;
					yylval.ival = strtol((char *)literal,&endptr,16);
					if (*endptr != '\0' || errno == ERANGE)
						elog(ERROR,"Bad hexadecimal integer input '%s'",literal);
					return ICONST;
				}
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 245 "scan.l"
{
					BEGIN(xq);
					llen = 0;
					*literal = '\0';
				}
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 250 "scan.l"
{
					BEGIN(INITIAL);
					yylval.str = pstrdup(scanstr(literal));
					return SCONST;
				}
	YY_BREAK
case 17:
#line 256 "scan.l"
case 18:
#line 257 "scan.l"
case 19:
YY_RULE_SETUP
#line 257 "scan.l"
{
					if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1))
						elog(ERROR,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
					memcpy(literal+llen, yytext, yyleng+1);
					llen += yyleng;
				}
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 263 "scan.l"
{
				}
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 267 "scan.l"
{
					BEGIN(xd);
					llen = 0;
					*literal = '\0';
				}
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 272 "scan.l"
{
					BEGIN(INITIAL);
					yylval.str = pstrdup(literal);
					return IDENT;
				}
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 277 "scan.l"
{
					if ((llen+yyleng) > (MAX_PARSE_BUFFER - 1))
						elog(ERROR,"quoted string parse buffer of %d chars exceeded",MAX_PARSE_BUFFER);
					memcpy(literal+llen, yytext, yyleng+1);
					llen += yyleng;
				}
	YY_BREAK
case 24:
YY_RULE_SETUP
#line 285 "scan.l"
{ /* ignore */ }
	YY_BREAK
case 25:
YY_RULE_SETUP
#line 286 "scan.l"
{
					BEGIN(INITIAL);
					return yytext[0];
				}
	YY_BREAK
case 26:
YY_RULE_SETUP
#line 292 "scan.l"
{ return TYPECAST; }
	YY_BREAK
case 27:
*yy_cp = yy_hold_char; /* undo effects of setting up yytext */
yy_c_buf_p = yy_cp = yy_bp + 1;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
#line 294 "scan.l"
{
					BEGIN(xm);
					return yytext[0];
				}
	YY_BREAK
case 28:
YY_RULE_SETUP
#line 298 "scan.l"
{ 	return yytext[0]; }
	YY_BREAK
case 29:
YY_RULE_SETUP
#line 299 "scan.l"
{ 	return yytext[0]; }
	YY_BREAK
case 30:
*yy_cp = yy_hold_char; /* undo effects of setting up yytext */
yy_c_buf_p = yy_cp -= 2;
YY_DO_BEFORE_ACTION; /* set up yytext again */
YY_RULE_SETUP
#line 300 "scan.l"
{
					yylval.str = pstrdup((char*)yytext);
					return Op;
				}
	YY_BREAK
case 31:
YY_RULE_SETUP
#line 304 "scan.l"
{
					if (strcmp((char*)yytext,"!=") == 0)
						yylval.str = pstrdup("<>"); /* compatability */
					else
						yylval.str = pstrdup((char*)yytext);
					return Op;
				}
	YY_BREAK
case 32: