/*
* eof_rules.lex : An example of using multiple buffers
* EOF rules, and start states
*/
%{
#define MAX_NEST 10
YY_BUFFER_STATE include_stack[MAX_NEST];
int include_count = -1;
%}
%x INCLUDE
%x COMMENT
%%
"{" BEGIN(COMMENT);
<COMMENT>"}" BEGIN(INITIAL);
<COMMENT>"$include"[ \t]*"(" BEGIN(INCLUDE);
<COMMENT>[ \t]* /* skip whitespace */
<INCLUDE>")" BEGIN(COMMENT);
<INCLUDE>[ \t]* /* skip whitespace */
<INCLUDE>[^ \t\n() ]+ { /* get the include file name */
if ( include_count >= MAX_NEST){
fprintf( stderr, "Too many include files" );
exit( 1 );
}
include_stack[++include_count] = YY_CURRENT_BUFFER;
yyin = fopen( yytext, "r" );
if ( ! yyin ){
fprintf( stderr, "Unable to open %s",yytext);
exit( 1 );
}
yy_switch_to_buffer(yy_create_buffer(yyin,YY_BUF_SIZE));
BEGIN(INITIAL);
}
<INCLUDE><<EOF>>
{
fprintf( stderr, "EOF in include" );
yyterminate();
}
<COMMENT><<EOF>>
{
fprintf( stderr, "EOF in comment" );
yyterminate();
}
<<EOF>> {
if ( include_count <= 0 ){
yyterminate();
} else {
yy_delete_buffer(include_stack[include_count--] );
yy_switch_to_buffer(include_stack[include_count] );
BEGIN(INCLUDE);
}
}
[a-z]+ ECHO;
.|\n ECHO;
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*© Formatika GbR, Deutschland
