lex.yy.c

针对“虎书”中的tiger语言写的词法分析器 实现了多重注释嵌套、字符串中特殊转义字符和文件结束等处理。 具体请参考Readme.txt

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 34 "tiger.lex"

#line 625 "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_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 >= 116 )
					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] != 140 );

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 "tiger.lex"
{adjust(); return ARRAY;}
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 36 "tiger.lex"
{adjust(); return IF;}
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 37 "tiger.lex"
{adjust(); return THEN;}
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 38 "tiger.lex"
{adjust(); return ELSE;}
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 39 "tiger.lex"
{adjust(); return WHILE;}
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 40 "tiger.lex"
{adjust(); return FOR;}
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 41 "tiger.lex"
{adjust(); return TO;}
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 42 "tiger.lex"
{adjust(); return DO;}
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 43 "tiger.lex"
{adjust(); return LET;}
	YY_BREAK
case 10:
YY_RULE_SETUP
#line 44 "tiger.lex"
{adjust(); return IN;}
	YY_BREAK
case 11:
YY_RULE_SETUP
#line 45 "tiger.lex"
{adjust(); return END;}
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 46 "tiger.lex"
{adjust(); return OF;}
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 47 "tiger.lex"
{adjust(); return BREAK;}
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 48 "tiger.lex"
{adjust(); return NIL;}
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 49 "tiger.lex"
{adjust(); return FUNCTION;}
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 50 "tiger.lex"
{adjust(); return VAR;}
	YY_BREAK
case 17:
YY_RULE_SETUP
#line 51 "tiger.lex"
{adjust(); return TYPE;}
	YY_BREAK
case 18:
YY_RULE_SETUP
#line 52 "tiger.lex"
{adjust(); return COMMA;}
	YY_BREAK
case 19:
YY_RULE_SETUP
#line 53 "tiger.lex"
{adjust(); return COLON;}
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 54 "tiger.lex"
{adjust(); return SEMICOLON;}
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 55 "tiger.lex"
{adjust(); return LPAREN;}
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 56 "tiger.lex"
{adjust(); return RPAREN;}
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 57 "tiger.lex"
{adjust(); return LBRACK;}
	YY_BREAK
case 24:
YY_RULE_SETUP
#line 58 "tiger.lex"
{adjust(); return RBRACK;}
	YY_BREAK
case 25:
YY_RULE_SETUP
#line 59 "tiger.lex"
{adjust(); return LBRACE;}
	YY_BREAK
case 26:
YY_RULE_SETUP
#line 60 "tiger.lex"
{adjust(); return RBRACE;}
	YY_BREAK
case 27:
YY_RULE_SETUP
#line 61 "tiger.lex"
{adjust(); return DOT;}
	YY_BREAK
case 28:
YY_RULE_SETUP
#line 62 "tiger.lex"
{adjust(); return PLUS;}
	YY_BREAK
case 29:
YY_RULE_SETUP
#line 63 "tiger.lex"
{adjust(); return MINUS;}
	YY_BREAK
case 30:
YY_RULE_SETUP
#line 64 "tiger.lex"
{adjust(); return TIMES;}
	YY_BREAK
case 31:
YY_RULE_SETUP
#line 65 "tiger.lex"
{adjust(); return DIVIDE;}
	YY_BREAK
case 32:
YY_RULE_SETUP
#line 66 "tiger.lex"
{adjust(); return EQ;}
	YY_BREAK
case 33:
YY_RULE_SETUP
#line 67 "tiger.lex"
{adjust(); return NEQ;}
	YY_BREAK
case 34:
YY_RULE_SETUP
#line 68 "tiger.lex"
{adjust(); return LT;}
	YY_BREAK
case 35:
YY_RULE_SETUP
#line 69 "tiger.lex"
{adjust(); return LE;}
	YY_BREAK
case 36:
YY_RULE_SETUP
#line 70 "tiger.lex"
{adjust(); return GT;}
	YY_BREAK
case 37:
YY_RULE_SETUP
#line 71 "tiger.lex"
{adjust(); return GE;}
	YY_BREAK
case 38:
YY_RULE_SETUP
#line 72 "tiger.lex"
{adjust(); return AND;}
	YY_BREAK
case 39:
YY_RULE_SETUP
#line 73 "tiger.lex"
{adjust(); return OR;}
	YY_BREAK
case 40:
YY_RULE_SETUP
#line 74 "tiger.lex"
{adjust(); return ASSIGN;}
	YY_BREAK
case 41:
YY_RULE_SETUP
#line 75 "tiger.lex"
{adjust();continue;}
	YY_BREAK
case 42:
YY_RULE_SETUP
#line 76 "tiger.lex"
{adjust();continue;}
	YY_BREAK
case 43:
YY_RULE_SETUP
#line 77 "tiger.lex"
{adjust();EM_newline(); continue;}
	YY_BREAK
case 44:
YY_RULE_SETUP
#line 78 "tiger.lex"
{	
						/* 转向COMMENT */
						adjust();
						begin_comment=end_comment=0;
						begin_comment++;						
						BEGIN COMMENT;
					}
	YY_BREAK
case 45:
YY_RULE_SETUP
#line 85 "tiger.lex"
{adjust();yylval.sval=String(yytext);return ID;}
	YY_BREAK
case 46:
YY_RULE_SETUP
#line 86 "tiger.lex"
{adjust();yylval.ival=atoi(yytext);return INT;}
	YY_BREAK
case 47:
YY_RULE_SETUP
#line 87 "tiger.lex"
{adjust();EM_error(EM_tokPos,"注释嵌套错误");}
	YY_BREAK
case 48:
YY_RULE_SETUP
#line 88 "tiger.lex"
{adjust();str[0]='\0';BEGIN STR;}
	YY_BREAK
case 49:
YY_RULE_SETUP
#line 89 "tiger.lex"
{adjust();EM_error(EM_tokPos,"非法字符");}
	YY_BREAK
case YY_STATE_EOF(INITIAL):
#line 90 "tiger.lex"
{adjust();yyterminate();}
	YY_BREAK
case 50:
YY_RULE_SETUP
#line 92 "tiger.lex"
{adjust();strcat(str,"\n");}
	YY_BREAK
case 51:
YY_RULE_SETUP
#line 93 "tiger.lex"
{adjust();strcat(str,"\\");}