--- /dev/null
+/* PSPP - computes sample statistics.
+ Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
+ Written by Ben Pfaff <blp@gnu.org>.
+
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA. */
+
+#include <stdlib.h>
+
+#include <config.h>
+
+#include "getl.h"
+
+#include <libpspp/str.h>
+#include <libpspp/ll.h>
+#include <libpspp/version.h>
+#include <libpspp/alloc.h>
+
+#include <data/file-name.h>
+
+struct getl_source
+ {
+ struct getl_source *included_from; /* File that this is nested inside. */
+ struct getl_source *includes; /* File nested inside this file. */
+
+ struct ll ll; /* Element in the sources list */
+
+ struct getl_interface *interface;
+ };
+
+/* List of source files. */
+static struct ll_list sources ;
+
+static struct string the_include_path;
+
+const char *
+getl_include_path (void)
+{
+ return ds_cstr (&the_include_path);
+}
+
+static struct getl_source *
+current_source (struct ll_list *list)
+{
+ const struct ll *ll = ll_head (list);
+ return ll_data (ll, struct getl_source, ll );
+}
+
+/* Initialize getl. */
+void
+getl_initialize (void)
+{
+ ll_init (&sources);
+ ds_init_cstr (&the_include_path,
+ fn_getenv_default ("STAT_INCLUDE_PATH", include_path));
+}
+
+/* Delete everything from the include path. */
+void
+getl_clear_include_path (void)
+{
+ ds_clear (&the_include_path);
+}
+
+/* Add to the include path. */
+void
+getl_add_include_dir (const char *path)
+{
+ if (ds_length (&the_include_path))
+ ds_put_char (&the_include_path, ':');
+
+ ds_put_cstr (&the_include_path, path);
+}
+
+/* Appends source S to the list of source files. */
+void
+getl_append_source (struct getl_interface *i)
+{
+ struct getl_source *s = xzalloc (sizeof ( struct getl_source ));
+
+ s->interface = i ;
+
+ ll_push_head (&sources, &s->ll);
+}
+
+/* Nests source S within the current source file. */
+void
+getl_include_source (struct getl_interface *i)
+{
+ struct getl_source *current = current_source (&sources);
+ struct getl_source *s = xzalloc (sizeof ( struct getl_source ));
+
+ s->interface = i;
+
+ s->included_from = current ;
+ s->includes = NULL;
+ current->includes = s;
+
+ ll_push_head (&sources, &s->ll);
+}
+
+/* Closes the current source, and move the current source to the
+ next file in the chain. */
+static void
+close_source (void)
+{
+ struct getl_source *s = current_source (&sources);
+
+ if ( s->interface->close )
+ s->interface->close (s->interface);
+
+ ll_pop_head (&sources);
+
+ if (s->included_from != NULL)
+ current_source (&sources)->includes = NULL;
+
+ free (s);
+}
+
+/* Closes all sources until an interactive source is
+ encountered. */
+void
+getl_abort_noninteractive (void)
+{
+ while ( ! ll_is_empty (&sources))
+ {
+ const struct getl_source *s = current_source (&sources);
+
+ if ( !s->interface->interactive (s->interface) )
+ close_source ();
+ }
+}
+
+/* Returns true if the current source is interactive,
+ false otherwise. */
+bool
+getl_is_interactive (void)
+{
+ const struct getl_source *s = current_source (&sources);
+
+ if (ll_is_empty (&sources) )
+ return false;
+
+ return s->interface->interactive (s->interface);
+}
+
+/* Returns the name of the current source, or NULL if there is no
+ current source */
+const char *
+getl_source_name (void)
+{
+ const struct getl_source *s = current_source (&sources);
+
+ if ( ll_is_empty (&sources) )
+ return NULL;
+
+ if ( ! s->interface->name )
+ return NULL;
+
+ return s->interface->name (s->interface);
+}
+
+/* Returns the location within the current source, or -1 if there is
+ no current source */
+int
+getl_source_location (void)
+{
+ const struct getl_source *s = current_source (&sources);
+
+ if ( ll_is_empty (&sources) )
+ return -1;
+
+ if ( !s->interface->location )
+ return -1;
+
+ return s->interface->location (s->interface);
+}
+
+
+/* Close getl. */
+void
+getl_uninitialize (void)
+{
+ while ( !ll_is_empty (&sources))
+ close_source ();
+ ds_destroy (&the_include_path);
+}
+
+
+/* Reads a single line into LINE.
+ Returns true when a line has been read, false at end of input.
+ If INTERACTIVE is non-null, then when true is returned
+ *INTERACTIVE will be set to true if the line was obtained
+ interactively, false otherwise. */
+bool
+do_read_line (struct string *line, bool *interactive)
+{
+ while (!ll_is_empty (&sources))
+ {
+ struct getl_source *s = current_source (&sources);
+
+ ds_clear (line);
+ if (s->interface->read (s->interface, line))
+ {
+ if (interactive != NULL)
+ *interactive = s->interface->interactive (s->interface);
+
+ while ((s))
+ {
+ if (s->interface->filter)
+ s->interface->filter (s->interface, line);
+ s = s->included_from;
+ }
+
+ return true;
+ }
+ close_source ();
+ }
+
+ return false;
+}
projects / pspp-builds.git / blobdiff