1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2006, 2007, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "libpspp/assertion.h"
24 #include "libpspp/message.h"
25 #include "language/expressions/helpers.h"
26 #include "language/expressions/private.h"
27 #include "language/lexer/value-parser.h"
28 #include "libpspp/pool.h"
29 #include "output/driver.h"
34 expr_evaluate (struct expression *e, const struct ccase *c, int case_idx,
37 struct dataset *ds = e->ds;
38 union operation_data *op = e->ops;
40 double *ns = e->number_stack;
41 struct substring *ss = e->string_stack;
43 /* Without a dictionary/dataset, the expression can't refer to variables,
44 and you don't need to specify a case when you evaluate the
45 expression. With a dictionary/dataset, the expression can refer
46 to variables, so you must specify a case when you evaluate the
48 assert ((c != NULL) == (e->ds != NULL));
50 pool_clear (e->eval_pool);
54 assert (op < e->ops + e->op_cnt);
55 switch (op++->operation)
64 const struct substring *s = &op++->string;
65 *ss++ = copy_string (e, s->string, s->length);
69 case OP_return_number:
70 *(double *) result = isfinite (ns[-1]) ? ns[-1] : SYSMIS;
73 case OP_return_string:
74 *(struct substring *) result = ss[-1];
77 #include "evaluate.inc"
86 expr_evaluate_num (struct expression *e, const struct ccase *c, int case_idx)
90 assert (e->type == OP_number || e->type == OP_boolean);
91 expr_evaluate (e, c, case_idx, &d);
96 expr_evaluate_str (struct expression *e, const struct ccase *c, int case_idx,
97 char *dst, size_t dst_size)
101 assert (e->type == OP_string);
102 assert ((dst == NULL) == (dst_size == 0));
103 expr_evaluate (e, c, case_idx, &s);
105 buf_copy_rpad (dst, dst_size, s.string, s.length, ' ');
108 #include "language/lexer/lexer.h"
109 #include "language/command.h"
112 cmd_debug_evaluate (struct lexer *lexer, struct dataset *dsother UNUSED)
114 bool optimize = true;
115 int retval = CMD_FAILURE;
116 bool dump_postfix = false;
118 struct ccase *c = NULL;
120 struct dataset *ds = NULL;
124 struct expression *expr;
128 struct dictionary *d = NULL;
129 if (lex_match_id (lexer, "NOOPTIMIZE"))
131 else if (lex_match_id (lexer, "POSTFIX"))
133 else if (lex_match (lexer, T_LPAREN))
138 if (!lex_force_id (lexer))
140 name = xstrdup (lex_tokcstr (lexer));
143 if (!lex_force_match (lexer, T_EQUALS))
146 if (lex_is_number (lexer))
148 else if (lex_is_string (lexer))
149 width = ss_length (lex_tokss (lexer));
152 lex_error (lexer, _("expecting number or string"));
158 ds = dataset_create (NULL, "");
159 d = dataset_dict (ds);
162 v = dict_create_var (d, name, width);
165 msg (SE, _("Duplicate variable name %s."), name);
172 c = case_create (dict_get_proto (d));
174 c = case_unshare_and_resize (c, dict_get_proto (d));
176 if (!parse_value (lexer, case_data_rw (c, v), v))
179 if (!lex_force_match (lexer, T_RPAREN))
186 if (!lex_force_match (lexer, T_SLASH))
189 expr = expr_parse_any (lexer, ds, optimize);
190 if (!expr || lex_end_of_command (lexer) != CMD_SUCCESS)
194 output_log ("error");
199 expr_debug_print_postfix (expr);
205 double d = expr_evaluate_num (expr, c, 0);
207 output_log ("sysmis");
209 output_log ("%.2f", d);
215 double b = expr_evaluate_num (expr, c, 0);
217 b == SYSMIS ? "sysmis" : b == 0.0 ? "false" : "true");
223 struct substring out;
224 expr_evaluate (expr, c, 0, &out);
225 output_log ("\"%.*s\"", (int) out.length, out.string);
234 retval = CMD_SUCCESS;
237 dataset_destroy (ds);
247 expr_debug_print_postfix (const struct expression *e)
249 struct string s = DS_EMPTY_INITIALIZER;
251 for (size_t i = 0; i < e->op_cnt; i++)
253 union operation_data *op = &e->ops[i];
255 ds_put_byte (&s, ' ');
256 switch (e->op_types[i])
259 if (op->operation == OP_return_number)
260 ds_put_cstr (&s, "return_number");
261 else if (op->operation == OP_return_string)
262 ds_put_cstr (&s, "return_string");
263 else if (is_function (op->operation))
264 ds_put_format (&s, "%s", operations[op->operation].prototype);
265 else if (is_composite (op->operation))
266 ds_put_format (&s, "%s", operations[op->operation].name);
268 ds_put_format (&s, "%s:", operations[op->operation].name);
271 if (op->number != SYSMIS)
272 ds_put_format (&s, "n<%g>", op->number);
274 ds_put_cstr (&s, "n<SYSMIS>");
277 ds_put_cstr (&s, "s<");
278 ds_put_substring (&s, op->string);
279 ds_put_byte (&s, '>');
283 char str[FMT_STRING_LEN_MAX + 1];
284 fmt_to_string (op->format, str);
285 ds_put_format (&s, "f<%s>", str);
289 ds_put_format (&s, "v<%s>", var_get_name (op->variable));
292 ds_put_format (&s, "vec<%s>", vector_get_name (op->vector));
295 ds_put_format (&s, "i<%d>", op->integer);
301 output_log_nocopy (ds_steal_cstr (&s));