adding the rest of vern's files

1 files changed, 65 insertions, 0 deletions

diff --git a/examples/manual/eof_rules.lex b/examples/manual/eof_rules.lex
new file mode 100644
index 0000000..b575f2c
--- /dev/null
+++ b/examples/manual/eof_rules.lex
@@ -0,0 +1,65 @@
+/*
+ * 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
+
+%%
+
+^"#include"[ \t]*\"  BEGIN(INCLUDE);
+<INCLUDE>\"          BEGIN(INITIAL); 
+<INCLUDE>[^\"]+ {      /* 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\"\n",yytext);
+             exit( 1 );
+          }
+
+          yy_switch_to_buffer(yy_create_buffer(yyin,YY_BUF_SIZE));
+
+          BEGIN(INITIAL);
+        }
+<INCLUDE><<EOF>> 
+        {
+            fprintf( stderr, "EOF in include" );
+            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;
+
+
+
+
+
+
+
+
+
+