+++ /dev/null
-/* PSPP - a program for statistical analysis.
- Copyright (C) 2006, 2010, 2011, 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 "language/data-io/placement-parser.h"
-
-#include <assert.h>
-
-#include "data/format.h"
-#include "language/lexer/format-parser.h"
-#include "language/lexer/lexer.h"
-#include "libpspp/message.h"
-#include "libpspp/pool.h"
-#include "libpspp/str.h"
-
-#include "gl/c-strcase.h"
-#include "gl/xalloc.h"
-#include "gl/xsize.h"
-
-#include "gettext.h"
-#define _(msgid) gettext (msgid)
-
-/* Extensions to the format specifiers used only for
- placement. */
-enum
- {
- PRS_TYPE_T = SCHAR_MAX - 3, /* Tab to absolute column. */
- PRS_TYPE_X, /* Skip columns. */
- PRS_TYPE_NEW_REC /* Next record. */
- };
-
-static bool fixed_parse_columns (struct lexer *, struct pool *, size_t n_vars,
- enum fmt_use, struct fmt_spec **, size_t *);
-static bool fixed_parse_fortran (struct lexer *l, struct pool *, enum fmt_use,
- struct fmt_spec **, size_t *);
-
-/* Parses Fortran-like or column-based specifications for placing
- variable data in fixed positions in columns and rows, that is,
- formats like those parsed by DATA LIST or PRINT. Returns true
- only if successful.
-
- The formats parsed are either input or output formats, according
- to USE.
-
- If USE is FMT_FOR_INPUT, then T, X, and / "formats" are parsed,
- in addition to regular formats. If USE is FMT_FOR_OUTPUT, then
- T and X "formats" are parsed but not /.
-
- If successful, formats for N_VARS variables are stored in
- *FORMATS, and the number of formats required is stored in
- *FORMAT_CNT. *FORMAT_CNT may be greater than N_VARS because
- of T, X, and / "formats", but success guarantees that exactly
- N_VARS variables will be placed by the output formats. The
- caller should call execute_placement_format to process those
- "formats" in interpreting the output.
-
- Uses POOL for allocation. When the caller is finished
- interpreting *FORMATS, POOL may be destroyed. */
-bool
-parse_var_placements (struct lexer *lexer, struct pool *pool, size_t n_vars,
- enum fmt_use use,
- struct fmt_spec **formats, size_t *n_formats)
-{
- assert (n_vars > 0);
- if (lex_is_number (lexer))
- return fixed_parse_columns (lexer, pool, n_vars, use,
- formats, n_formats);
- else if (lex_match (lexer, T_LPAREN))
- {
- int start_ofs = lex_ofs (lexer);
- if (!fixed_parse_fortran (lexer, pool, use, formats, n_formats))
- return false;
- int end_ofs = lex_ofs (lexer) - 1;
-
- size_t n_assignments = 0;
- for (size_t i = 0; i < *n_formats; i++)
- n_assignments += (*formats)[i].type < FMT_NUMBER_OF_FORMATS;
-
- if (n_assignments != n_vars)
- {
- lex_ofs_error (lexer, start_ofs, end_ofs,
- _("Number of variables specified (%zu) "
- "differs from number of variable formats (%zu)."),
- n_vars, n_assignments);
- return false;
- }
-
- return true;
- }
- else
- {
- lex_error (lexer, _("SPSS-like or Fortran-like format "
- "specification expected after variable names."));
- return false;
- }
-}
-
-/* Implements parse_var_placements for column-based formats. */
-static bool
-fixed_parse_columns (struct lexer *lexer, struct pool *pool, size_t n_vars,
- enum fmt_use use,
- struct fmt_spec **formats, size_t *n_formats)
-{
- int start_ofs = lex_ofs (lexer);
-
- int fc, lc;
- if (!parse_column_range (lexer, 1, &fc, &lc, NULL))
- return false;
-
- /* Divide columns evenly. */
- int w = (lc - fc + 1) / n_vars;
- if ((lc - fc + 1) % n_vars)
- {
- lex_ofs_error (lexer, start_ofs, lex_ofs (lexer) - 1,
- _("The %d columns %d-%d "
- "can't be evenly divided into %zu fields."),
- lc - fc + 1, fc, lc, n_vars);
- return false;
- }
-
- /* Format specifier. */
- enum fmt_type type;
- int d;
- if (lex_match (lexer, T_LPAREN))
- {
- /* Get format type. */
- if (lex_token (lexer) == T_ID)
- {
- if (!parse_format_specifier_name (lexer, &type))
- return false;
- lex_match (lexer, T_COMMA);
- }
- else
- type = FMT_F;
-
- /* Get decimal places. */
- if (lex_is_integer (lexer))
- {
- d = lex_integer (lexer);
- lex_get (lexer);
- }
- else
- d = 0;
-
- if (!lex_force_match (lexer, T_RPAREN))
- return false;
- }
- else
- {
- type = FMT_F;
- d = 0;
- }
- int end_ofs = lex_ofs (lexer) - 1;
-
- struct fmt_spec format = { .type = type, .w = w, .d = d };
- char *error = fmt_check__ (&format, use);
- if (error)
- {
- lex_ofs_error (lexer, start_ofs, end_ofs, "%s", error);
- free (error);
- return false;
- }
-
- *formats = pool_nalloc (pool, n_vars + 1, sizeof **formats);
- *n_formats = n_vars + 1;
- (*formats)[0].type = (enum fmt_type) PRS_TYPE_T;
- (*formats)[0].w = fc;
- for (size_t i = 1; i <= n_vars; i++)
- (*formats)[i] = format;
- return true;
-}
-
-/* Implements parse_var_placements for Fortran-like formats. */
-static bool
-fixed_parse_fortran (struct lexer *lexer, struct pool *pool, enum fmt_use use,
- struct fmt_spec **formats, size_t *n_formats)
-{
- size_t formats_allocated = 0;
- size_t formats_used = 0;
-
- *formats = NULL;
- while (!lex_match (lexer, T_RPAREN))
- {
- struct fmt_spec f;
- struct fmt_spec *new_formats;
- size_t n_new_formats;
- size_t count;
- size_t formats_needed;
-
- /* Parse count. */
- if (lex_is_integer (lexer))
- {
- count = lex_integer (lexer);
- lex_get (lexer);
- }
- else
- count = 1;
-
- /* Parse format specifier. */
- if (lex_match (lexer, T_LPAREN))
- {
- /* Call ourselves recursively to handle parentheses. */
- if (!fixed_parse_fortran (lexer, pool, use,
- &new_formats, &n_new_formats))
- return false;
- }
- else
- {
- new_formats = &f;
- n_new_formats = 1;
- if (use == FMT_FOR_INPUT && lex_match (lexer, T_SLASH))
- f.type = (enum fmt_type) PRS_TYPE_NEW_REC;
- else
- {
- int ofs = lex_ofs (lexer);
- char type[FMT_TYPE_LEN_MAX + 1];
- if (!parse_abstract_format_specifier (lexer, type, &f.w, &f.d))
- return false;
-
- if (!c_strcasecmp (type, "T"))
- f.type = (enum fmt_type) PRS_TYPE_T;
- else if (!c_strcasecmp (type, "X"))
- {
- f.type = (enum fmt_type) PRS_TYPE_X;
- f.w = count;
- count = 1;
- }
- else
- {
- if (!fmt_from_name (type, &f.type))
- {
- lex_ofs_error (lexer, ofs, ofs,
- _("Unknown format type `%s'."), type);
- return false;
- }
- char *error = fmt_check__ (&f, use);
- if (error)
- {
- lex_ofs_error (lexer, ofs, ofs, "%s", error);
- free (error);
- return false;
- }
- }
- }
- }
-
- /* Add COUNT copies of the NEW_FORMAT_CNT formats in
- NEW_FORMATS to FORMATS. */
- if (n_new_formats != 0
- && size_overflow_p (xtimes (xsum (formats_used,
- xtimes (count, n_new_formats)),
- sizeof *formats)))
- xalloc_die ();
- formats_needed = count * n_new_formats;
- if (formats_used + formats_needed > formats_allocated)
- {
- formats_allocated = formats_used + formats_needed;
- *formats = pool_2nrealloc (pool, *formats, &formats_allocated,
- sizeof **formats);
- }
- for (; count > 0; count--)
- {
- memcpy (&(*formats)[formats_used], new_formats,
- sizeof **formats * n_new_formats);
- formats_used += n_new_formats;
- }
-
- lex_match (lexer, T_COMMA);
- }
-
- *n_formats = formats_used;
- return true;
-}
-
-/* Checks whether FORMAT represents one of the special "formats"
- for T, X, or /. If so, updates *RECORD or *COLUMN (or both)
- as appropriate, and returns true. Otherwise, returns false
- without any side effects. */
-bool
-execute_placement_format (const struct fmt_spec *format,
- int *record, int *column)
-{
- switch ((int) format->type)
- {
- case PRS_TYPE_X:
- *column += format->w;
- return true;
-
- case PRS_TYPE_T:
- *column = format->w;
- return true;
-
- case PRS_TYPE_NEW_REC:
- (*record)++;
- *column = 1;
- return true;
-
- default:
- assert (format->type < FMT_NUMBER_OF_FORMATS);
- return false;
- }
-}
-
-static bool
-parse_column__ (struct lexer *lexer, bool negative, int base, int *column)
-{
- assert (base == 0 || base == 1);
-
- if (!lex_force_int (lexer))
- return false;
- long int value = lex_integer (lexer);
- if (negative)
- value = -value;
- lex_get (lexer);
-
- *column = value - base + 1;
- if (*column < 1)
- {
- if (base == 1)
- lex_next_error (lexer, -1, -1,
- _("Column positions for fields must be positive."));
- else
- lex_next_error (lexer, -1, -1,
- _("Column positions for fields must not be negative."));
- return false;
- }
- return true;
-}
-
-/* Parses a BASE-based column using LEXER. Returns true and
- stores a 1-based column number into *COLUMN if successful,
- otherwise emits an error message and returns false.
-
- If BASE is 0, zero-based column numbers are parsed; if BASE is
- 1, 1-based column numbers are parsed. Regardless of BASE, the
- values stored in *FIRST_COLUMN and *LAST_COLUMN are
- 1-based. */
-bool
-parse_column (struct lexer *lexer, int base, int *column)
-{
- return parse_column__ (lexer, false, base, column);
-}
-
-/* Parse a column or a range of columns, specified as a single
- integer or two integers delimited by a dash. Stores the range
- in *FIRST_COLUMN and *LAST_COLUMN. (If only a single integer
- is given, it is stored in both.) If RANGE_SPECIFIED is
- non-null, then *RANGE_SPECIFIED is set to true if the syntax
- contained a dash, false otherwise. Returns true if
- successful, false if the syntax was invalid or the values
- specified did not make sense.
-
- If BASE is 0, zero-based column numbers are parsed; if BASE is
- 1, 1-based column numbers are parsed. Regardless of BASE, the
- values stored in *FIRST_COLUMN and *LAST_COLUMN are
- 1-based. */
-bool
-parse_column_range (struct lexer *lexer, int base,
- int *first_column, int *last_column,
- bool *range_specified)
-{
- int start_ofs = lex_ofs (lexer);
-
- /* First column. */
- if (!parse_column__ (lexer, false, base, first_column))
- return false;
-
- /* Last column. */
- if (lex_is_integer (lexer) && lex_integer (lexer) < 0)
- {
- if (!parse_column__ (lexer, true, base, last_column))
- return false;
-
- if (*last_column < *first_column)
- {
- lex_ofs_error (lexer, start_ofs, lex_ofs (lexer) - 1,
- _("The ending column for a field must be "
- "greater than the starting column."));
- return false;
- }
-
- if (range_specified)
- *range_specified = true;
- }
- else
- {
- *last_column = *first_column;
- if (range_specified)
- *range_specified = false;
- }
-
- return true;
-}
-
-/* Parses a (possibly empty) sequence of slashes, each of which
- may be followed by an integer. A slash on its own increases
- *RECORD by 1 and sets *COLUMN to 1. A slash followed by an
- integer sets *RECORD to the integer, as long as that increases
- *RECORD, and sets *COLUMN to 1.
-
- Returns true if successful, false on syntax error. */
-bool
-parse_record_placement (struct lexer *lexer, int *record, int *column)
-{
- while (lex_match (lexer, T_SLASH))
- {
- if (lex_is_number (lexer))
- {
- if (!lex_force_int_range (lexer, NULL, *record + 1, INT_MAX))
- return false;
- *record = lex_integer (lexer);
- lex_get (lexer);
- }
- else
- (*record)++;
- *column = 1;
- }
- assert (*record >= 1);
-
- return true;
-}
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