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- Reverted to manual flex push/pup structure for include files.

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This commit is contained in:
ccremers 2006-08-01 09:09:44 +00:00
parent 5e10206df1
commit 18d4b94b1e
1 changed files with 40 additions and 17 deletions
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31
src/scanner.l
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@ -50,17 +50,37 @@ id @?({letter}|{digit}|[\^\-!'])+
/* the "incl" state is used for picking up the name of an include file
*/
%x incl inclend
%{
#define MAX_INCLUDE_DEPTH 10
YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
int include_stack_ptr = 0;
%}
%%
include BEGIN(incl);
<incl>[ \t]*\" /* eat the whitespace */
<incl>[^\"]+ { /* got the include file name */
if ( include_stack_ptr >= MAX_INCLUDE_DEPTH )
{
fprintf( stderr, "Includes nested too deeply" );
exit( 1 );
}
include_stack[include_stack_ptr++] =
YY_CURRENT_BUFFER;
/* try to open, using scytherdirs environment variable as well. */
yyin = openFileSearch (yytext, NULL);
if (! yyin)
{
error ("Could not open include file %s.", yytext);
error ("could not open include file %s.", yytext);
}
yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE ));
yy_switch_to_buffer(
yy_create_buffer( yyin, YY_BUF_SIZE ) );
BEGIN(INITIAL);
}
@ -69,13 +89,16 @@ include BEGIN(incl);
}
<INITIAL><<EOF>> {
yypop_buffer_state();
if (! YY_CURRENT_BUFFER )
if ( --include_stack_ptr < 0 )
{
yyterminate();
}
else
{
yy_delete_buffer( YY_CURRENT_BUFFER );
yy_switch_to_buffer(
include_stack[include_stack_ptr] );
BEGIN(inclend);
}
}