abnf.flx

来自「mgcp协议源代码和测试程序,还有一个编译器」· FLX 代码 · 共 68 行

%{
#include <stdio.h>
#include <string.h>
#include "abnf.tab.h"

int iAbnfFileNumber;
%}

%option noyywrap

%x STRING
%s NORMAL
%s HEXVAL

%% 
[;][^\n]*		{}     /* eat up comment */ 
"%d"                    {
							return DEC_VAL;
						}
"%x"                    {
							BEGIN(HEXVAL);
							return HEX_VAL;
						}
<HEXVAL>[0-9A-Fa-f]+	{
							yylval.sz = strdup(yytext);
							return HEXDIG;
						}
<HEXVAL>[/)]		{
						BEGIN(NORMAL);
						return yytext[0];
					}
<HEXVAL>[ \t\r\n]	{
						BEGIN(NORMAL);
					}

\"					{
						BEGIN(STRING);
					}
<STRING>[^"]+\"		{
						yylval.sz = malloc(strlen(yytext)+2); 
						sprintf(yylval.sz,"\"%s", yytext);
						BEGIN(NORMAL);
						return QUOTED_STRING;
					}
^[a-zA-Z][_a-zA-Z0-9\-]*	{
								yylval.sz = strdup(yytext);
								return RULE_NAME;
							}
[a-zA-Z][_a-zA-Z0-9\-]*		{
								yylval.sz = strdup(yytext);
								return ELEMENT_NAME;
							}
[0-9]+		{
				yylval.sz = strdup(yytext);
				return DIGIT; 
			}
[ \t\r\n]           /* eat up space and line */
[-=*()/\[\]] 		{
						return yytext[0];
					}

<<EOF>>			{
					yyterminate();
			    }
.		 /* eat up the remainder char */

%%