lex.l

来自「編譯器的虛擬yacc工具」· L 代码 · 共 26 行

%{
#include <stdio.h>
/* The purpose of this lex specification is to do some simple
fixes to lex specifications to use this tool.  In particular, any
default definition for yylval needs to be removed and any use of
this variable needs to be updated to use the generated union values
appropriately 
E. White
*/

%}
%s CCODE
%%
<INITIAL>"%{"		{BEGIN CCODE;ECHO;}
<CCODE>^.*"yylval".*$ 	;
<CCODE>"%}"			{BEGIN INITIAL;ECHO;}
<INITIAL>"yylval"	{ECHO;printf(".vyacc_attrs.x[0]"); }
<INITIAL>"yylval"\.	{ECHO;printf("vyacc_attrs."); }
.			{ECHO;}
[\n]			{ECHO;}
%%

main() {
  yylex();
}