lexer.c

这是一个非常有价值的参考代码

		/* 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 >= 552 )
					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] != 629 );

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 55 "../lexer.l"
{ yylval = number(yytext); return TKN_NUMBER; }
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 56 "../lexer.l"
{ yylval = number(yytext); return TKN_NUMBER; }
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 57 "../lexer.l"
{ yylval = number(yytext); return TKN_NUMBER; }
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 59 "../lexer.l"
{ string_buf_ptr = string_buf; BEGIN(str); }
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 61 "../lexer.l"
{ yylval = hexnumber(yytext); return TKN_NUMBER; }
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 65 "../lexer.l"
{ /* The following eats '#' style comments to end of line */
       BEGIN(comment); }
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 67 "../lexer.l"
/* eat comments */ 
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 68 "../lexer.l"
{ lineno++; BEGIN(INITIAL); }
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 71 "../lexer.l"
{  /* The following eats multiline C style comments */
        int c;
        int comment_start;
        
        comment_start = lineno;
        while (1) {
          while (((c = input()) != '*') && (c != EOF)) {
            /* eat up text of comment, but keep counting lines */
            if (c == '\n')
              lineno++;
          }
          
          if (c == '*') {
            while ((c = input()) == '*')
              ;
            if (c == '/')
              break;    /* found the end */
          }
          
          if (c == EOF) {
            fprintf(stderr, "error at %s:%d: EOF in comment\n", 
                    infile, lineno);
            fprintf(stderr, "    comment started on line %d\n", 
                    comment_start);
            exit(1);
            break;
          }
        }
     }
	YY_BREAK

case 10:
YY_RULE_SETUP
#line 103 "../lexer.l"
{ *string_buf_ptr = 0; string_buf_ptr = string_buf; 
         yylval = string(string_buf_ptr); BEGIN(INITIAL); return TKN_STRING; }
	YY_BREAK
case 11:
YY_RULE_SETUP
#line 105 "../lexer.l"
*string_buf_ptr++ = '\n';
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 106 "../lexer.l"
*string_buf_ptr++ = '\t';
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 107 "../lexer.l"
*string_buf_ptr++ = '\r';
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 108 "../lexer.l"
*string_buf_ptr++ = '\b';
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 109 "../lexer.l"
*string_buf_ptr++ = '\f';
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 110 "../lexer.l"
*(string_buf_ptr++) = yytext[1];
	YY_BREAK
case 17:
YY_RULE_SETUP
#line 111 "../lexer.l"
{ char *yptr = yytext; while (*yptr) 
                                         *(string_buf_ptr++) = *(yptr++); }
	YY_BREAK
case 18:
YY_RULE_SETUP
#line 113 "../lexer.l"
{ fprintf(stderr, "error at line %d: unterminated character constant\n",
         lineno); 
         exit(1); }
	YY_BREAK

case 19:
YY_RULE_SETUP
#line 118 "../lexer.l"
{ yylval=NULL; return K_ALLOWFULLPAGEBITSTREAM; }
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 119 "../lexer.l"
{ yylval=NULL; return K_AVR910; }
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 120 "../lexer.l"
{ yylval=NULL; return K_AVR910_DEVCODE; }
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 121 "../lexer.l"
{ yylval=NULL; return K_PAGE_SIZE; }
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 122 "../lexer.l"
{ yylval=NULL; return K_PAGED; }
	YY_BREAK
case 24:
YY_RULE_SETUP
#line 123 "../lexer.l"
{ yylval=NULL; return K_BAUDRATE; }
	YY_BREAK
case 25:
YY_RULE_SETUP
#line 124 "../lexer.l"
{ yylval=NULL; return K_BS2; }
	YY_BREAK
case 26:
YY_RULE_SETUP
#line 125 "../lexer.l"
{ yylval=NULL; return K_BUFF; }
	YY_BREAK
case 27:
YY_RULE_SETUP
#line 126 "../lexer.l"
{ yylval=NULL; return K_BUTTERFLY; }
	YY_BREAK
case 28:
YY_RULE_SETUP
#line 127 "../lexer.l"
{ yylval=NULL; return K_CHIP_ERASE_DELAY; }
	YY_BREAK
case 29:
YY_RULE_SETUP
#line 128 "../lexer.l"
{ yylval=NULL; return K_DESC; }
	YY_BREAK
case 30:
YY_RULE_SETUP
#line 129 "../lexer.l"
{ yylval=NULL; return K_DEFAULT_PARALLEL; }
	YY_BREAK
case 31:
YY_RULE_SETUP
#line 130 "../lexer.l"
{ yylval=NULL; return K_DEFAULT_PROGRAMMER; }
	YY_BREAK
case 32:
YY_RULE_SETUP
#line 131 "../lexer.l"
{ yylval=NULL; return K_DEFAULT_SERIAL; }
	YY_BREAK
case 33:
YY_RULE_SETUP
#line 132 "../lexer.l"
{ yylval=NULL; return K_DEVICECODE; }
	YY_BREAK
case 34:
YY_RULE_SETUP
#line 133 "../lexer.l"
{ yylval=NULL; return K_EECR; }
	YY_BREAK
case 35:
YY_RULE_SETUP
#line 134 "../lexer.l"
{ yylval=NULL; return K_EEPROM; }
	YY_BREAK
case 36:
YY_RULE_SETUP
#line 135 "../lexer.l"
{ yylval=NULL; return K_ENABLEPAGEPROGRAMMING; }
	YY_BREAK
case 37:
YY_RULE_SETUP
#line 136 "../lexer.l"
{ yylval=NULL; return K_ERRLED; }
	YY_BREAK
case 38:
YY_RULE_SETUP
#line 137 "../lexer.l"
{ yylval=NULL; return K_FLASH; }
	YY_BREAK
case 39:
YY_RULE_SETUP
#line 138 "../lexer.l"
{ yylval=NULL; return K_HAS_JTAG; }
	YY_BREAK
case 40:
YY_RULE_SETUP
#line 139 "../lexer.l"
{ yylval=NULL; return K_ID; }
	YY_BREAK
case 41:
YY_RULE_SETUP
#line 140 "../lexer.l"
{ yylval=NULL; return K_IDR; }
	YY_BREAK
case 42:
YY_RULE_SETUP
#line 141 "../lexer.l"
{ yylval=NULL; return K_JTAG_MKII; }
	YY_BREAK
case 43:
YY_RULE_SETUP
#line 142 "../lexer.l"
{ yylval=NULL; return K_MAX_WRITE_DELAY; }
	YY_BREAK
case 44:
YY_RULE_SETUP
#line 143 "../lexer.l"
{ yylval=NULL; return K_MEMORY; }
	YY_BREAK
case 45:
YY_RULE_SETUP
#line 144 "../lexer.l"
{ yylval=NULL; return K_MIN_WRITE_DELAY; }
	YY_BREAK
case 46:
YY_RULE_SETUP
#line 145 "../lexer.l"
{ yylval=NULL; return K_MISO; }
	YY_BREAK
case 47:
YY_RULE_SETUP
#line 146 "../lexer.l"
{ yylval=NULL; return K_MOSI; }
	YY_BREAK
case 48:
YY_RULE_SETUP
#line 147 "../lexer.l"
{ yylval=NULL; return K_NUM_PAGES; }
	YY_BREAK
case 49:
YY_RULE_SETUP
#line 148 "../lexer.l"
{ yylval=NULL; return K_NUM_PAGES; }
	YY_BREAK
case 50:
YY_RULE_SETUP
#line 149 "../lexer.l"
{ yylval=NULL; return K_PAGE_SIZE; }
	YY_BREAK
case 51:
YY_RULE_SETUP
#line 150 "../lexer.l"
{ yylval=NULL; return K_PAGED; }
	YY_BREAK
case 52:
YY_RULE_SETUP
#line 151 "../lexer.l"
{ yylval=NULL; return K_PAGEL; }
	YY_BREAK
case 53:
YY_RULE_SETUP
#line 152 "../lexer.l"
{ yylval=NULL; return K_PAR; }
	YY_BREAK
case 54:
YY_RULE_SETUP
#line 153 "../lexer.l"
{ yylval=NULL; return K_PARALLEL; }
	YY_BREAK
case 55:
YY_RULE_SETUP
#line 154 "../lexer.l"
{ yylval=NULL; return K_PART; }
	YY_BREAK
case 56:
YY_RULE_SETUP
#line 155 "../lexer.l"
{ yylval=NULL; return K_PGMLED; }
	YY_BREAK
case 57:
YY_RULE_SETUP
#line 156 "../lexer.l"
{ yylval=NULL; return K_PROGRAMMER; }
	YY_BREAK
case 58:
YY_RULE_SETUP
#line 157 "../lexer.l"
{ yylval=NULL; return K_PWROFF_AFTER_WRITE; }
	YY_BREAK
case 59:
YY_RULE_SETUP
#line 158 "../lexer.l"
{ yylval=NULL; return K_RAMPZ; }
	YY_BREAK
case 60:
YY_RULE_SETUP
#line 159 "../lexer.l"
{ yylval=NULL; return K_RDYLED; }
	YY_BREAK
case 61:
YY_RULE_SETUP
#line 160 "../lexer.l"
{ yylval=NULL; return K_READBACK_P1; }
	YY_BREAK
case 62:
YY_RULE_SETUP
#line 161 "../lexer.l"
{ yylval=NULL; return K_READBACK_P2; }
	YY_BREAK
case 63:
YY_RULE_SETUP
#line 162 "../lexer.l"
{ yylval=NULL; return K_RETRY_PULSE; }
	YY_BREAK
case 64:
YY_RULE_SETUP
#line 163 "../lexer.l"
{ yylval=NULL; return K_SERBB; }
	YY_BREAK
case 65:
YY_RULE_SETUP
#line 164 "../lexer.l"
{ yylval=NULL; return K_SERIAL; }
	YY_BREAK
case 66:
YY_RULE_SETUP
#line 165 "../lexer.l"
{ yylval=NULL; return K_SIZE; }
	YY_BREAK
case 67:
YY_RULE_SETUP
#line 166 "../lexer.l"
{ yylval=NULL; return K_SPMCR; }
	YY_BREAK
case 68:
YY_RULE_SETUP
#line 167 "../lexer.l"
{ yylval=NULL; return K_STK500; }
	YY_BREAK
case 69:
YY_RULE_SETUP
#line 168 "../lexer.l"
{ yylval=NULL; return K_STK500V2; }
	YY_BREAK
case 70:
YY_RULE_SETUP
#line 169 "../lexer.l"
{ yylval=NULL; return K_STK500_DEVCODE; }
	YY_BREAK
case 71:
YY_RULE_SETUP
#line 170 "../lexer.l"
{ yylval=NULL; return K_TYPE; }
	YY_BREAK
case 72:
YY_RULE_SETUP
#line 171 "../lexer.l"
{ yylval=NULL; return K_VCC; }
	YY_BREAK
case 73:
YY_RULE_SETUP
#line 172 "../lexer.l"
{ yylval=NULL; return K_VFYLED; }
	YY_BREAK
case 74:
YY_RULE_SETUP
#line 174 "../lexer.l"
{ yylval=NULL; return K_TIMEOUT; }
	YY_BREAK
case 75:
YY_RULE_SETUP