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| -rw-r--r-- | lib/termtable.h | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/lib/termtable.h b/lib/termtable.h new file mode 100644 index 0000000..e61c7fa --- /dev/null +++ b/lib/termtable.h @@ -0,0 +1,297 @@ +/* + * ASCII table generator. + * Copyright (C) 2017 Cumulus Networks + * Quentin Young + * + * 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 2 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; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef _TERMTABLE_H_ +#define _TERMTABLE_H_ + +#include <zebra.h> + +#ifdef __cplusplus +extern "C" { +#endif + +enum ttable_align { + LEFT, + RIGHT, + TOP, + BOTTOM, +}; + +struct ttable_border { + char top; + char bottom; + char left; + char right; + + bool top_on; + bool bottom_on; + bool left_on; + bool right_on; +}; + +/* cell style and cell */ +struct ttable_cellstyle { + short lpad; + short rpad; + enum ttable_align align; + struct ttable_border border; +}; + +struct ttable_cell { + char *text; + struct ttable_cellstyle style; +}; + +/* table style and table */ +struct ttable_style { + char corner; /* intersection */ + int indent; /* left table indent */ + bool rownums_on; /* show row numbers; unimplemented */ + + struct ttable_border border; + struct ttable_cellstyle cell; +}; + +struct ttable { + int nrows; /* number of rows */ + int ncols; /* number of cols */ + struct ttable_cell **table; /* table, row x col */ + size_t size; /* size */ + struct ttable_style style; /* style */ +}; + +/* some predefined styles */ +#define TTSTYLE_ASCII 0 +#define TTSTYLE_BLANK 1 + +extern const struct ttable_style ttable_styles[2]; + +/** + * Creates a new table with the default style, which looks like this: + * + * +----------+----------+ + * | column 1 | column 2 | + * +----------+----------+ + * | data... | data!! | + * +----------+----------+ + * | datums | 12345 | + * +----------+----------+ + * + * @return the created table + */ +struct ttable *ttable_new(const struct ttable_style *tts); + +/** + * Deletes a table and releases all associated resources. + * + * @param tt the table to destroy + */ +void ttable_del(struct ttable *tt); + +/** + * Inserts a new row at the given index. + * + * The row contents are determined by a format string. The format string has + * the same form as a regular printf format string, except that columns are + * delimited by '|'. For example, to make the first column of the table above, + * the call is: + * + * ttable_insert_row(<tt>, <n>, "%s|%s", "column 1", "column 2"); + * + * All features of printf format strings are permissible here. + * + * Caveats: + * - At present you cannot insert '|' into a cell's contents. + * - If there are N columns, '|' must appear n-1 times or the row will not be + * created + * + * @param tt table to insert row into + * @param row the row number (begins at 0) + * @param format column-separated format string + * @param ... arguments to format string + * + * @return pointer to the first cell in the created row, or NULL if not enough + * columns were specified + */ +struct ttable_cell *ttable_insert_row(struct ttable *tt, unsigned int row, + const char *format, ...) PRINTFRR(3, 4); +/** + * Inserts a new row at the end of the table. + * + * The row contents are determined by a format string. The format string has + * the same form as a regular printf format string, except that columns are + * delimited by '|'. For example, to make the first column of the table above, + * the call is: + * + * ttable_add_row(<tt>, "%s|%s", "column 1", "column 2"); + * + * All features of printf format strings are permissible here. + * + * Caveats: + * - At present you cannot insert '|' into a cell's contents. + * - If there are N columns, '|' must appear n-1 times or the row will not be + * created + * + * @param tt table to insert row into + * @param format column-separated format string + * @param ... arguments to format string + * + * @return pointer to the first cell in the created row, or NULL if not enough + * columns were specified + */ +struct ttable_cell *ttable_add_row(struct ttable *tt, const char *format, ...) + PRINTFRR(2, 3); + +/** + * Removes a row from the table. + * + * @param tt table to delete row from + * @param row the row number (begins at 0) + */ +void ttable_del_row(struct ttable *tt, unsigned int row); + +/** + * Sets alignment for a range of cells. + * + * Available alignments are LEFT and RIGHT. Cell contents will be aligned + * accordingly, while respecting padding (if any). Suppose a cell has: + * + * lpad = 1 + * rpad = 1 + * align = RIGHT + * text = 'datums' + * + * The cell would look like: + * + * +-------------------+ + * | datums | + * +-------------------+ + * + * On the other hand: + * + * lpad = 1 + * rpad = 10 + * align = RIGHT + * text = 'datums' + * + * +-------------------+ + * | datums | + * +-------------------+ + * + * The default alignment is LEFT. + * + * @param tt the table to set alignment on + * @param srow starting row index + * @param scol starting column index + * @param nrow # rows to align + * @param ncol # cols to align + * @param align the alignment to set + */ +void ttable_align(struct ttable *tt, unsigned int srow, unsigned int scol, + unsigned int erow, unsigned int ecol, + enum ttable_align align); + +/** + * Sets padding for a range of cells. + * + * Available padding options are LEFT and RIGHT (the alignment enum is reused). + * Both options may be set. Padding is treated as though it is stuck to the + * walls of the cell. Suppose a cell has: + * + * lpad = 4 + * rpad = 2 + * align = RIGHT + * text = 'datums' + * + * The cell padding, marked by '.', would look like: + * + * +--------------+ + * | .datums. | + * +--------------+ + * + * If the column is wider than the cell, the cell contents are aligned in an + * additional padded field according to the cell alignment. + * + * +--------------------+ + * | Data!!!11!~~~~~:-) | + * +--------------------+ + * | . datums. | + * +--------------------+ + * + * @param tt the table to set padding on + * @param srow starting row index + * @param scol starting column index + * @param nrow # rows to pad + * @param ncol # cols to pad + * @param align LEFT or RIGHT + * @param pad # spaces to pad with + */ +void ttable_pad(struct ttable *tt, unsigned int srow, unsigned int scol, + unsigned int nrow, unsigned int ncol, enum ttable_align align, + short pad); + +/** + * Restyle all cells according to table.cell.style. + * + * @param tt table to restyle + */ +void ttable_restyle(struct ttable *tt); + +/** + * Turn left/right column separators on or off for specified column. + * + * @param tt table + * @param col column index + * @param align left or right separators + * @param on true/false for on/off + * @param sep character to use + */ +void ttable_colseps(struct ttable *tt, unsigned int col, + enum ttable_align align, bool on, char sep); + +/** + * Turn bottom row separators on or off for specified row. + * + * @param tt table + * @param row row index + * @param align left or right separators + * @param on true/false for on/off + * @param sep character to use + */ +void ttable_rowseps(struct ttable *tt, unsigned int row, + enum ttable_align align, bool on, char sep); + +/** + * Dumps a table to a heap-allocated string. + * + * Caller must free this string after use with + * + * XFREE (MTYPE_TMP, str); + * + * @param tt the table to dump + * @param newline the desired newline sequence to use, null terminated. + * @return table in text form + */ +char *ttable_dump(struct ttable *tt, const char *newline); + +#ifdef __cplusplus +} +#endif + +#endif /* _TERMTABLE_H */ |