control-stack: Move from language to data directory.

[pspp] / src / data / control-stack.h

diff --git a/src/data/control-stack.h b/src/data/control-stack.h
new file mode 100644 (file)
index 0000000..9c6824b
--- /dev/null
+++ b/src/data/control-stack.h
@@ -0,0 +1,43 @@
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 1997-9, 2000, 2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef CTL_STACK_H
+#define CTL_STACK_H 1
+
+#include <stdbool.h>
+
+/* The following #include avoids a potential problem when Gnulib substitutes
+ * for close() by putting "#define close rpl_close" into <unistd.h>, by
+ * ensuring that every source file that includes this one sees the #define..
+ * (It would probably be better to rename the 'close' member of struct
+ * ctl_class.)  */
+#include <unistd.h>
+
+struct ctl_class
+  {
+    const char *start_name;     /* e.g. LOOP. */
+    const char *end_name;       /* e.g. END LOOP. */
+    void (*close) (void *);     /* Closes the control structure. */
+  };
+
+void ctl_stack_clear (void);
+void ctl_stack_push (const struct ctl_class *, void *private);
+void *ctl_stack_top (const struct ctl_class *);
+void *ctl_stack_search (const struct ctl_class *);
+void ctl_stack_pop (void *);
+bool ctl_stack_is_empty (void);
+
+#endif /* ctl_stack.h */