scan.l - The First Step


Detect a pattern and return a token for Yacc to chew on. Straightforward.

(...)
"for"          { count(); return(FOR); }
"goto"         { count(); return(GOTO); }
"if"           { count(); return(IF); }
"int"          { count(); return(INT); }
"long"         { count(); return(LONG); }
"return"       { count(); return(RETURN); }
"void"         { count(); return(VOID); }
"while"        { count(); return(WHILE); }
"..."          { count(); return(VAR_ARGS); } /* CAUTION! varargs */
[1-9]{D}*{IS}?   { count(); yylval.val = const_v(yytext); return(CONSTANT); }
L?\"(\\.|[^\\"])*\"  { count(); yylval.val = str_val(yytext);return(STRING_LITERAL); }