Implement variable and data file attributes.

[pspp-builds.git] / src / language / dictionary / attributes.c

diff --git a/src/language/dictionary/attributes.c b/src/language/dictionary/attributes.c
new file mode 100644 (file)
index 0000000..9e9b808
--- /dev/null
+++ b/src/language/dictionary/attributes.c
@@ -0,0 +1,200 @@
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2008 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/>. */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include <data/attributes.h>
+#include <data/dictionary.h>
+#include <data/procedure.h>
+#include <data/variable.h>
+#include <language/command.h>
+#include <language/lexer/lexer.h>
+#include <language/lexer/variable-parser.h>
+#include <libpspp/message.h>
+
+#include "xalloc.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+static enum cmd_result parse_attributes (struct lexer *, struct attrset **,
+                                         size_t n);
+
+/* Parses the DATAFILE ATTRIBUTE command. */
+int
+cmd_datafile_attribute (struct lexer *lexer, struct dataset *ds)
+{
+  struct attrset *set = dict_get_attributes (dataset_dict (ds));
+  return parse_attributes (lexer, &set, 1);
+}
+
+/* Parses the VARIABLE ATTRIBUTE command. */
+int
+cmd_variable_attribute (struct lexer *lexer, struct dataset *ds)
+{
+  do 
+    {
+      struct variable **vars;
+      struct attrset **sets;
+      size_t n_vars, i;
+      bool ok;
+
+      if (!lex_force_match_id (lexer, "VARIABLES")
+          || !lex_force_match (lexer, '=')
+          || !parse_variables (lexer, dataset_dict (ds), &vars, &n_vars,
+                               PV_NONE))
+        return CMD_FAILURE;
+
+      sets = xmalloc (n_vars * sizeof *sets);
+      for (i = 0; i < n_vars; i++)
+        sets[i] = var_get_attributes (vars[i]);
+
+      ok = parse_attributes (lexer, sets, n_vars);
+      free (vars);
+      free (sets);
+      if (!ok)
+        return CMD_FAILURE;
+    }
+  while (lex_match (lexer, '/'));
+
+  return lex_end_of_command (lexer);
+}
+
+static bool
+match_subcommand (struct lexer *lexer, const char *keyword) 
+{
+  if (lex_token (lexer) == T_ID
+      && lex_id_match (ss_cstr (lex_tokid (lexer)), ss_cstr (keyword))
+      && lex_look_ahead (lexer) == '=') 
+    {
+      lex_get (lexer);          /* Skip keyword. */
+      lex_get (lexer);          /* Skip '='. */
+      return true;
+    }
+  else
+    return false;
+}
+
+static bool
+parse_attribute_name (struct lexer *lexer, char name[VAR_NAME_LEN + 1],
+                      size_t *index) 
+{
+  if (!lex_force_id (lexer))
+    return false;
+  strcpy (name, lex_tokid (lexer));
+  lex_get (lexer);
+
+  if (lex_match (lexer, '[')) 
+    {
+      if (!lex_force_int (lexer))
+        return false;
+      if (lex_integer (lexer) < 1 || lex_integer (lexer) > 65535)
+        {
+          msg (SE, _("Attribute array index must be between 1 and 65535."));
+          return false;
+        }
+      *index = lex_integer (lexer);
+      lex_get (lexer);
+      if (!lex_force_match (lexer, ']'))
+        return false;
+    }
+  else
+    *index = 0;
+  return true;
+}
+
+static bool
+add_attribute (struct lexer *lexer, struct attrset **sets, size_t n) 
+{
+  char name[VAR_NAME_LEN + 1];
+  size_t index, i;
+  char *value;
+
+  if (!parse_attribute_name (lexer, name, &index)
+      || !lex_force_match (lexer, '(')
+      || !lex_force_string (lexer))
+    return false;
+  value = ds_cstr (lex_tokstr (lexer));
+
+  for (i = 0; i < n; i++)
+    {
+      struct attribute *attr = attrset_lookup (sets[i], name);
+      if (attr == NULL) 
+        {
+          attr = attribute_create (name);
+          attrset_add (sets[i], attr); 
+        }
+      attribute_set_value (attr, index ? index - 1 : 0, value);
+    }
+
+  lex_get (lexer);
+  return lex_force_match (lexer, ')');
+}
+
+static bool
+delete_attribute (struct lexer *lexer, struct attrset **sets, size_t n) 
+{
+  char name[VAR_NAME_LEN + 1];
+  size_t index, i;
+
+  if (!parse_attribute_name (lexer, name, &index))
+    return false;
+
+  for (i = 0; i < n; i++) 
+    {
+      struct attrset *set = sets[i];
+      if (index == 0)
+        attrset_delete (set, name);
+      else
+        {
+          struct attribute *attr = attrset_lookup (set, name);
+          if (attr != NULL) 
+            {
+              attribute_del_value (attr, index - 1);
+              if (attribute_get_n_values (attr) == 0)
+                attrset_delete (set, name); 
+            }
+        }
+    }
+  return true;
+}
+
+static enum cmd_result
+parse_attributes (struct lexer *lexer, struct attrset **sets, size_t n) 
+{
+  enum { UNKNOWN, ADD, DELETE } command = UNKNOWN;
+  do 
+    {
+      if (match_subcommand (lexer, "ATTRIBUTE"))
+        command = ADD;
+      else if (match_subcommand (lexer, "DELETE"))
+        command = DELETE;
+      else if (command == UNKNOWN)
+        {
+          lex_error (lexer, _("expecting ATTRIBUTE= or DELETE="));
+          return CMD_FAILURE;
+        }
+
+      if (!(command == ADD
+            ? add_attribute (lexer, sets, n)
+            : delete_attribute (lexer, sets, n)))
+        return CMD_FAILURE;
+    }
+  while (lex_token (lexer) != '/' && lex_token (lexer) != '.');
+  return CMD_SUCCESS;
+}