+++ /dev/null
-/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000, 2009-2012 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/dataset.h"
-#include "data/transformations.h"
-#include "language/command.h"
-#include "language/data-io/inpt-pgm.h"
-#include "language/expressions/public.h"
-#include "language/lexer/lexer.h"
-#include "libpspp/compiler.h"
-#include "libpspp/message.h"
-#include "libpspp/str.h"
-
-#include "gl/xalloc.h"
-
-#include "gettext.h"
-#define _(msgid) gettext (msgid)
-
-/* A conditional clause. */
-struct clause
- {
- struct msg_location *location;
- struct expression *condition; /* Test expression; NULL for ELSE clause. */
- struct trns_chain xforms;
- };
-
-/* DO IF transformation. */
-struct do_if_trns
- {
- struct clause *clauses; /* Clauses. */
- size_t n_clauses; /* Number of clauses. */
-
- const struct trns_chain *resume;
- size_t ofs;
- };
-
-static const struct trns_class do_if_trns_class;
-
-static void
-start_clause (struct lexer *lexer, struct dataset *ds,
- bool condition, struct do_if_trns *do_if,
- size_t *allocated_clauses, bool *ok)
-{
- if (*ok && do_if->n_clauses > 0
- && !do_if->clauses[do_if->n_clauses - 1].condition)
- {
- if (condition)
- lex_ofs_error (lexer, 0, 1,
- _("ELSE IF is not allowed following ELSE "
- "within DO IF...END IF."));
- else
- lex_ofs_error (lexer, 0, 0,
- _("Only one ELSE is allowed within DO IF...END IF."));
-
- msg_at (SN, do_if->clauses[do_if->n_clauses - 1].location,
- _("This is the location of the previous ELSE clause."));
-
- msg_at (SN, do_if->clauses[0].location,
- _("This is the location of the DO IF command."));
-
- *ok = false;
- }
-
- if (do_if->n_clauses >= *allocated_clauses)
- do_if->clauses = x2nrealloc (do_if->clauses, allocated_clauses,
- sizeof *do_if->clauses);
- struct clause *clause = &do_if->clauses[do_if->n_clauses++];
-
- *clause = (struct clause) { .location = NULL };
- if (condition)
- {
- clause->condition = expr_parse_bool (lexer, ds);
- if (!clause->condition)
- lex_discard_rest_of_command (lexer);
- }
- clause->location = lex_ofs_location (lexer, 0, lex_ofs (lexer));
-
- lex_end_of_command (lexer);
- lex_get (lexer);
-
- proc_push_transformations (ds);
-}
-
-static void
-finish_clause (struct dataset *ds, struct do_if_trns *do_if)
-{
- struct clause *clause = &do_if->clauses[do_if->n_clauses - 1];
- proc_pop_transformations (ds, &clause->xforms);
-}
-
-/* Parse DO IF. */
-int
-cmd_do_if (struct lexer *lexer, struct dataset *ds)
-{
- struct do_if_trns *do_if = xmalloc (sizeof *do_if);
- *do_if = (struct do_if_trns) { .n_clauses = 0 };
-
- size_t allocated_clauses = 0;
- bool ok = true;
-
- start_clause (lexer, ds, true, do_if, &allocated_clauses, &ok);
- while (!lex_match_phrase (lexer, "END IF"))
- {
- if (lex_token (lexer) == T_STOP)
- {
- lex_error_expecting (lexer, "END IF");
- break;
- }
- else if (lex_match_phrase (lexer, "ELSE IF"))
- {
- finish_clause (ds, do_if);
- start_clause (lexer, ds, true, do_if, &allocated_clauses, &ok);
- }
- else if (lex_match_id (lexer, "ELSE"))
- {
- finish_clause (ds, do_if);
- start_clause (lexer, ds, false, do_if, &allocated_clauses, &ok);
- }
- else
- cmd_parse_in_state (lexer, ds,
- (in_input_program ()
- ? CMD_STATE_NESTED_INPUT_PROGRAM
- : CMD_STATE_NESTED_DATA));
- }
- finish_clause (ds, do_if);
-
- add_transformation (ds, &do_if_trns_class, do_if);
-
- return ok ? CMD_SUCCESS : CMD_FAILURE;
-}
-
-int
-cmd_inside_do_if (struct lexer *lexer, struct dataset *ds UNUSED)
-{
- lex_ofs_error (lexer, 0, lex_ofs (lexer) - 1,
- _("This command cannot appear outside DO IF...END IF."));
- return CMD_FAILURE;
-}
-
-static const struct trns_chain *
-do_if_find_clause (const struct do_if_trns *do_if,
- struct ccase *c, casenumber case_num)
-{
- for (size_t i = 0; i < do_if->n_clauses; i++)
- {
- const struct clause *clause = &do_if->clauses[i];
- if (!clause->condition)
- return &clause->xforms;
-
- double boolean = expr_evaluate_num (clause->condition, c, case_num);
- if (boolean != 0.0)
- return boolean == SYSMIS ? NULL : &clause->xforms;
- }
- return NULL;
-}
-
-static enum trns_result
-do_if_trns_proc (void *do_if_, struct ccase **c, casenumber case_num)
-{
- struct do_if_trns *do_if = do_if_;
-
- const struct trns_chain *chain;
- size_t start;
- if (do_if->resume)
- {
- chain = do_if->resume;
- start = do_if->ofs;
- do_if->resume = NULL;
- do_if->ofs = 0;
- }
- else
- {
- chain = do_if_find_clause (do_if, *c, case_num);
- if (!chain)
- return TRNS_CONTINUE;
- start = 0;
- }
-
- for (size_t i = start; i < chain->n; i++)
- {
- const struct transformation *trns = &chain->xforms[i];
- enum trns_result r = trns->class->execute (trns->aux, c, case_num);
- switch (r)
- {
- case TRNS_CONTINUE:
- break;
-
- case TRNS_BREAK:
- case TRNS_DROP_CASE:
- case TRNS_ERROR:
- case TRNS_END_FILE:
- return r;
-
- case TRNS_END_CASE:
- do_if->resume = chain;
- do_if->ofs = i;
- return r;
- }
- }
- return TRNS_CONTINUE;
-}
-
-static bool
-do_if_trns_free (void *do_if_)
-{
- struct do_if_trns *do_if = do_if_;
-
- for (size_t i = 0; i < do_if->n_clauses; i++)
- {
- struct clause *clause = &do_if->clauses[i];
-
- msg_location_destroy (clause->location);
- expr_free (clause->condition);
-
- trns_chain_uninit (&clause->xforms);
- }
- free (do_if->clauses);
- free (do_if);
- return true;
-}
-
-static const struct trns_class do_if_trns_class = {
- .name = "DO IF",
- .execute = do_if_trns_proc,
- .destroy = do_if_trns_free,
-};
projects / pspp / blobdiff