--- /dev/null
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 2011, 2012, 2013, 2019 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 "data/case.h"
+#include "data/casegrouper.h"
+#include "data/casereader.h"
+#include "data/dataset.h"
+#include "data/dictionary.h"
+#include "data/format.h"
+#include "data/variable.h"
+
+#include "language/lexer/lexer.h"
+#include "language/lexer/variable-parser.h"
+
+#include "libpspp/pool.h"
+
+#include "means.h"
+
+/* Parse the /TABLES stanza of the command. */
+static bool
+parse_means_table_syntax (struct lexer *lexer, const struct means *cmd,
+ struct mtable *table)
+{
+ memset (table, 0, sizeof *table);
+
+ /* Dependent variable (s) */
+ if (!parse_variables_const_pool (lexer, cmd->pool, cmd->dict,
+ &table->dep_vars, &table->n_dep_vars,
+ PV_NO_DUPLICATE | PV_NUMERIC))
+ return false;
+
+ /* Factor variable (s) */
+ while (lex_match (lexer, T_BY))
+ {
+ struct layer *layer = pool_zalloc (cmd->pool, sizeof *layer);
+
+ table->layers =
+ pool_nrealloc (cmd->pool, table->layers, table->n_layers + 1,
+ sizeof *table->layers);
+ table->layers[table->n_layers] = layer;
+ table->n_layers++;
+
+ if (!parse_variables_const_pool
+ (lexer, cmd->pool, cmd->dict,
+ &layer->factor_vars,
+ &layer->n_factor_vars,
+ PV_NO_DUPLICATE))
+ return false;
+ }
+
+ return true;
+}
+
+/* Match a variable.
+ If the match succeeds, the variable will be placed in VAR.
+ Returns true if successful */
+static bool
+lex_is_variable (struct lexer *lexer, const struct dictionary *dict,
+ int n)
+{
+ if (lex_next_token (lexer, n) != T_ID)
+ return false;
+
+ const char *tstr = lex_next_tokcstr (lexer, n);
+ return dict_lookup_var (dict, tstr) != NULL;
+}
+
+static const struct cell_spec *
+match_cell (struct lexer *lexer)
+{
+ for (size_t i = 0; i < n_MEANS_STATISTICS; ++i)
+ {
+ const struct cell_spec *cs = &cell_spec[i];
+ if (lex_match_id (lexer, cs->keyword))
+ return cs;
+ }
+ return NULL;
+}
+
+static void
+add_statistic (struct means *means, int statistic)
+{
+ if (means->n_statistics >= means->allocated_statistics)
+ means->statistics = pool_2nrealloc (means->pool, means->statistics,
+ &means->allocated_statistics,
+ sizeof *means->statistics);
+ means->statistics[means->n_statistics++] = statistic;
+}
+
+void
+means_set_default_statistics (struct means *means)
+{
+ means->n_statistics = 0;
+ add_statistic (means, MEANS_MEAN);
+ add_statistic (means, MEANS_N);
+ add_statistic (means, MEANS_STDDEV);
+}
+
+bool
+means_parse (struct lexer *lexer, struct means *means)
+{
+ /* Optional TABLES=. */
+ if (lex_match_id (lexer, "TABLES") && !lex_force_match (lexer, T_EQUALS))
+ return false;
+
+ /* Parse the "tables" */
+ for (;;)
+ {
+ means->table = pool_realloc (means->pool, means->table,
+ (means->n_tables + 1) * sizeof *means->table);
+
+ if (!parse_means_table_syntax (lexer, means,
+ &means->table[means->n_tables]))
+ return false;
+ means->n_tables++;
+
+ /* Look ahead to see if there are more tables to be parsed */
+ if (lex_next_token (lexer, 0) != T_SLASH
+ || !lex_is_variable (lexer, means->dict, 1))
+ break;
+ lex_match (lexer, T_SLASH);
+ }
+
+ /* /MISSING subcommand */
+ while (lex_token (lexer) != T_ENDCMD)
+ {
+ lex_match (lexer, T_SLASH);
+
+ if (lex_match_id (lexer, "MISSING"))
+ {
+ /* If no MISSING subcommand is specified, each combination of a
+ dependent variable and categorical variables is handled
+ separately. */
+ lex_match (lexer, T_EQUALS);
+ if (lex_match_id (lexer, "INCLUDE"))
+ {
+ /* Use the subcommand "/MISSING=INCLUDE" to include user-missing
+ values in the analysis. */
+
+ means->ctrl_exclude = MV_SYSTEM;
+ means->dep_exclude = MV_SYSTEM;
+ }
+ else if (lex_match_id (lexer, "DEPENDENT"))
+ /* Use the command "/MISSING=DEPENDENT" to include user-missing
+ values for the categorical variables, while excluding them for
+ the dependent variables.
+
+ Cases are dropped only when user-missing values appear in
+ dependent variables. User-missing values for categorical
+ variables are treated according to their face value.
+
+ Cases are ALWAYS dropped when System Missing values appear in
+ the categorical variables. */
+ {
+ means->dep_exclude = MV_ANY;
+ means->ctrl_exclude = MV_SYSTEM;
+ }
+ else
+ {
+ lex_error_expecting (lexer, "INCLUDE", "DEPENDENT");
+ return false;
+ }
+ }
+ else if (lex_match_id (lexer, "CELLS"))
+ {
+ lex_match (lexer, T_EQUALS);
+
+ /* The default values become overwritten */
+ means->n_statistics = 0;
+ while (lex_token (lexer) != T_ENDCMD && lex_token (lexer) != T_SLASH)
+ {
+ if (lex_match (lexer, T_ALL))
+ {
+ means->n_statistics = 0;
+ for (int i = 0; i < n_MEANS_STATISTICS; ++i)
+ add_statistic (means, i);
+ }
+ else if (lex_match_id (lexer, "NONE"))
+ means->n_statistics = 0;
+ else if (lex_match_id (lexer, "DEFAULT"))
+ means_set_default_statistics (means);
+ else
+ {
+ const struct cell_spec *cs = match_cell (lexer);
+ if (cs)
+ add_statistic (means, cs - cell_spec);
+ else
+ {
+ const char *keywords[n_MEANS_STATISTICS];
+ for (int i = 0; i < n_MEANS_STATISTICS; ++i)
+ keywords[i] = cell_spec[i].keyword;
+ lex_error_expecting_array (lexer, keywords,
+ n_MEANS_STATISTICS);
+ return false;
+ }
+ }
+ }
+ }
+ else
+ {
+ lex_error_expecting (lexer, "MISSING", "CELLS");
+ return false;
+ }
+ }
+ return true;
+}
projects / pspp / blobdiff