wc.l

YYCC语言编译器

%{
/************************************************************
wc.l
Simple word count program. main is defined in the programs
section since the one in the library calls yyparse instead. 
************************************************************/

int wc = 0;		/* word count */
%}

%%
[a-zA-Z]+	{ wc++; }
\n|.		{ /* gobble up */ }

%%
int main(void)
{
	int n = yylex();
	return n;
}

int yywrap(void)
{
	printf("word count: %d\n", wc);
	return 1;
}