1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997, 1998, 1999, 2000, 2009, 2011, 2013, 2014, 2018 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/>. */
17 #ifndef OUTPUT_TABLE_PROVIDER
18 #define OUTPUT_TABLE_PROVIDER 1
20 #include "output/table.h"
22 /* An item of contents within a table cell. */
25 unsigned int options; /* TAB_*. */
26 char *text; /* A paragraph of text. */
28 /* Optional footnote(s). */
33 /* A cell in a table. */
36 /* Occupied table region.
38 d[TABLE_HORZ][0] is the leftmost column.
39 d[TABLE_HORZ][1] is the rightmost column, plus 1.
40 d[TABLE_VERT][0] is the top row.
41 d[TABLE_VERT][1] is the bottom row, plus 1.
44 d[TABLE_HORZ][1] == d[TABLE_HORZ][0] + 1
45 and d[TABLE_VERT][1] == d[TABLE_VERT][0] + 1
48 d[TABLE_HORZ][1] > d[TABLE_HORZ][0] + 1
49 or d[TABLE_VERT][1] > d[TABLE_VERT][0] + 1
51 int d[TABLE_N_AXES][2];
53 /* The cell's contents.
55 Most table cells contain only one item (a paragraph of text), but cells
56 are allowed to be empty (n_contents == 0) or contain a nested table, or
59 'inline_contents' provides a place to store a single item to handle the
62 const struct cell_contents *contents;
64 struct cell_contents inline_contents;
66 /* Called to free the cell's data, if nonnull. */
67 void (*destructor) (void *destructor_aux);
71 void table_cell_free (struct table_cell *);
73 /* Returns the number of columns that CELL spans. This is 1 for an ordinary
74 cell and greater than one for a cell that joins multiple columns. */
76 table_cell_colspan (const struct table_cell *cell)
78 return cell->d[TABLE_HORZ][1] - cell->d[TABLE_HORZ][0];
81 /* Returns the number of rows that CELL spans. This is 1 for an ordinary cell
82 and greater than one for a cell that joins multiple rows. */
84 table_cell_rowspan (const struct table_cell *cell)
86 return cell->d[TABLE_VERT][1] - cell->d[TABLE_VERT][0];
89 /* Returns true if CELL is a joined cell, that is, if it spans multiple rows
90 or columns. Otherwise, returns false. */
92 table_cell_is_joined (const struct table_cell *cell)
94 return table_cell_colspan (cell) > 1 || table_cell_rowspan (cell) > 1;
97 /* Declarations to allow defining table classes. */
103 The table class may assume that any cells that were retrieved by calling
104 the 'get_cell' function have been freed (by calling their destructors)
105 before this function is called. */
106 void (*destroy) (struct table *table);
108 /* Initializes CELL with the contents of the table cell at column X and row
109 Y within TABLE. All members of CELL must be initialized, except that if
110 'destructor' is set to a null pointer, then 'destructor_aux' need not be
111 initialized. The 'contents' member of CELL must be set to a nonnull
114 The table class must allow any number of cells in the table to be
115 retrieved simultaneously; that is, TABLE must not assume that a given
116 cell will be freed before another one is retrieved using 'get_cell'.
118 The table class must allow joined cells to be retrieved, with identical
119 contents, using any (X,Y) location inside the cell.
121 The table class must not allow cells to overlap.
123 The table class should not allow a joined cell to cross the border
124 between header rows/columns and the interior of the table. That is, a
125 joined cell should be entirely within headers rows and columns or
126 entirely outside them.
128 The table class may assume that CELL will be freed before TABLE is
130 void (*get_cell) (const struct table *table, int x, int y,
131 struct table_cell *cell);
133 /* Returns one of the TAL_* enumeration constants (declared in
134 output/table.h) representing a rule running alongside one of the cells
137 See table_get_rule() in table.c for a detailed explanation of the
138 meaning of AXIS and X and Y, including a diagram. */
139 int (*get_rule) (const struct table *table,
140 enum table_axis axis, int x, int y);
142 /* This function is optional and most table classes will not implement it.
144 If provided, this function must take ownership of A and B and return a
145 table that consists of tables A and B "pasted together", that is, a
146 table whose size is the sum of the sizes of A and B along the axis
147 specified by ORIENTATION. A and B will ordinarily have the same size
148 along the axis opposite ORIENTATION; no particular handling of tables
149 that have different sizes along that axis is required.
151 The handling of rules at the seam between A and B is not specified, but
152 table_rule_combine() is one reasonable way to do it.
154 Called only if neither A and B is shared (as returned by
157 Called if A or B or both is of the class defined by this table class.
158 That is, the implementation must be prepared to deal with the case where
159 A or B is not the ordinarily expected table class.
161 This function may return a null pointer if it cannot implement the paste
162 operation, in which case the caller will use a fallback
165 This function is used to implement table_paste(). */
166 struct table *(*paste) (struct table *a, struct table *b,
167 enum table_axis orientation);
169 /* This function is optional and most table classes will not implement it.
171 If provided, this function must take ownership of TABLE and return a new
172 table whose contents are the TABLE's rows RECT[TABLE_VERT][0] through
173 RECT[TABLE_VERT][1], exclusive, and the TABLE's columns
174 RECT[TABLE_HORZ][0] through RECT[TABLE_HORZ][1].
176 Called only if TABLE is not shared (as returned by table_is_shared()).
178 This function may return a null pointer if it cannot implement the
179 select operation, in which case the caller will use a fallback
182 This function is used to implement table_select(). */
183 struct table *(*select) (struct table *table, int rect[TABLE_N_AXES][2]);
186 void table_init (struct table *, const struct table_class *);
188 /* Table class implementations can call these functions or just set the
189 table's n[] and h[][] members directly. */
190 void table_set_nc (struct table *, int nc);
191 void table_set_nr (struct table *, int nr);
193 /* For use primarily by output drivers. */
195 void table_get_cell (const struct table *, int x, int y, struct table_cell *);
196 int table_get_rule (const struct table *, enum table_axis, int x, int y);
198 #endif /* output/table-provider.h */