1/*	$Id: tbl_layout.c,v 1.44 2017/06/27 18:25:02 schwarze Exp $ */
2/*
3 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2012, 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18#include "config.h"
19
20#include <sys/types.h>
21
22#include <ctype.h>
23#include <stdint.h>
24#include <stdlib.h>
25#include <string.h>
26#include <time.h>
27
28#include "mandoc.h"
29#include "mandoc_aux.h"
30#include "libmandoc.h"
31#include "libroff.h"
32
33struct	tbl_phrase {
34	char		 name;
35	enum tbl_cellt	 key;
36};
37
38static	const struct tbl_phrase keys[] = {
39	{ 'c',		 TBL_CELL_CENTRE },
40	{ 'r',		 TBL_CELL_RIGHT },
41	{ 'l',		 TBL_CELL_LEFT },
42	{ 'n',		 TBL_CELL_NUMBER },
43	{ 's',		 TBL_CELL_SPAN },
44	{ 'a',		 TBL_CELL_LONG },
45	{ '^',		 TBL_CELL_DOWN },
46	{ '-',		 TBL_CELL_HORIZ },
47	{ '_',		 TBL_CELL_HORIZ },
48	{ '=',		 TBL_CELL_DHORIZ }
49};
50
51#define KEYS_MAX ((int)(sizeof(keys)/sizeof(keys[0])))
52
53static	void		 mods(struct tbl_node *, struct tbl_cell *,
54				int, const char *, int *);
55static	void		 cell(struct tbl_node *, struct tbl_row *,
56				int, const char *, int *);
57static	struct tbl_cell *cell_alloc(struct tbl_node *, struct tbl_row *,
58				enum tbl_cellt);
59
60
61static void
62mods(struct tbl_node *tbl, struct tbl_cell *cp,
63		int ln, const char *p, int *pos)
64{
65	char		*endptr;
66	size_t		 sz;
67
68mod:
69	while (p[*pos] == ' ' || p[*pos] == '\t')
70		(*pos)++;
71
72	/* Row delimiters and cell specifiers end modifier lists. */
73
74	if (strchr(".,-=^_ACLNRSaclnrs", p[*pos]) != NULL)
75		return;
76
77	/* Throw away parenthesised expression. */
78
79	if ('(' == p[*pos]) {
80		(*pos)++;
81		while (p[*pos] && ')' != p[*pos])
82			(*pos)++;
83		if (')' == p[*pos]) {
84			(*pos)++;
85			goto mod;
86		}
87		mandoc_msg(MANDOCERR_TBLLAYOUT_PAR, tbl->parse,
88		    ln, *pos, NULL);
89		return;
90	}
91
92	/* Parse numerical spacing from modifier string. */
93
94	if (isdigit((unsigned char)p[*pos])) {
95		cp->spacing = strtoull(p + *pos, &endptr, 10);
96		*pos = endptr - p;
97		goto mod;
98	}
99
100	switch (tolower((unsigned char)p[(*pos)++])) {
101	case 'b':
102		cp->flags |= TBL_CELL_BOLD;
103		goto mod;
104	case 'd':
105		cp->flags |= TBL_CELL_BALIGN;
106		goto mod;
107	case 'e':
108		cp->flags |= TBL_CELL_EQUAL;
109		goto mod;
110	case 'f':
111		break;
112	case 'i':
113		cp->flags |= TBL_CELL_ITALIC;
114		goto mod;
115	case 'm':
116		mandoc_msg(MANDOCERR_TBLLAYOUT_MOD, tbl->parse,
117		    ln, *pos, "m");
118		goto mod;
119	case 'p':
120	case 'v':
121		if (p[*pos] == '-' || p[*pos] == '+')
122			(*pos)++;
123		while (isdigit((unsigned char)p[*pos]))
124			(*pos)++;
125		goto mod;
126	case 't':
127		cp->flags |= TBL_CELL_TALIGN;
128		goto mod;
129	case 'u':
130		cp->flags |= TBL_CELL_UP;
131		goto mod;
132	case 'w':
133		sz = 0;
134		if (p[*pos] == '(') {
135			(*pos)++;
136			while (p[*pos + sz] != '\0' && p[*pos + sz] != ')')
137				sz++;
138		} else
139			while (isdigit((unsigned char)p[*pos + sz]))
140				sz++;
141		if (sz) {
142			free(cp->wstr);
143			cp->wstr = mandoc_strndup(p + *pos, sz);
144			*pos += sz;
145			if (p[*pos] == ')')
146				(*pos)++;
147		}
148		goto mod;
149	case 'x':
150		cp->flags |= TBL_CELL_WMAX;
151		goto mod;
152	case 'z':
153		cp->flags |= TBL_CELL_WIGN;
154		goto mod;
155	case '|':
156		if (cp->vert < 2)
157			cp->vert++;
158		else
159			mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
160			    tbl->parse, ln, *pos - 1, NULL);
161		goto mod;
162	default:
163		mandoc_vmsg(MANDOCERR_TBLLAYOUT_CHAR, tbl->parse,
164		    ln, *pos - 1, "%c", p[*pos - 1]);
165		goto mod;
166	}
167
168	/* Ignore parenthised font names for now. */
169
170	if (p[*pos] == '(')
171		goto mod;
172
173	/* Support only one-character font-names for now. */
174
175	if (p[*pos] == '\0' || (p[*pos + 1] != ' ' && p[*pos + 1] != '.')) {
176		mandoc_vmsg(MANDOCERR_FT_BAD, tbl->parse,
177		    ln, *pos, "TS %s", p + *pos - 1);
178		if (p[*pos] != '\0')
179			(*pos)++;
180		if (p[*pos] != '\0')
181			(*pos)++;
182		goto mod;
183	}
184
185	switch (p[(*pos)++]) {
186	case '3':
187	case 'B':
188		cp->flags |= TBL_CELL_BOLD;
189		goto mod;
190	case '2':
191	case 'I':
192		cp->flags |= TBL_CELL_ITALIC;
193		goto mod;
194	case '1':
195	case 'R':
196		goto mod;
197	default:
198		mandoc_vmsg(MANDOCERR_FT_BAD, tbl->parse,
199		    ln, *pos - 1, "TS f%c", p[*pos - 1]);
200		goto mod;
201	}
202}
203
204static void
205cell(struct tbl_node *tbl, struct tbl_row *rp,
206		int ln, const char *p, int *pos)
207{
208	int		 i;
209	enum tbl_cellt	 c;
210
211	/* Handle leading vertical lines */
212
213	while (p[*pos] == ' ' || p[*pos] == '\t' || p[*pos] == '|') {
214		if (p[*pos] == '|') {
215			if (rp->vert < 2)
216				rp->vert++;
217			else
218				mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
219				    tbl->parse, ln, *pos, NULL);
220		}
221		(*pos)++;
222	}
223
224again:
225	while (p[*pos] == ' ' || p[*pos] == '\t')
226		(*pos)++;
227
228	if (p[*pos] == '.' || p[*pos] == '\0')
229		return;
230
231	/* Parse the column position (`c', `l', `r', ...). */
232
233	for (i = 0; i < KEYS_MAX; i++)
234		if (tolower((unsigned char)p[*pos]) == keys[i].name)
235			break;
236
237	if (i == KEYS_MAX) {
238		mandoc_vmsg(MANDOCERR_TBLLAYOUT_CHAR, tbl->parse,
239		    ln, *pos, "%c", p[*pos]);
240		(*pos)++;
241		goto again;
242	}
243	c = keys[i].key;
244
245	/* Special cases of spanners. */
246
247	if (c == TBL_CELL_SPAN) {
248		if (rp->last == NULL)
249			mandoc_msg(MANDOCERR_TBLLAYOUT_SPAN,
250			    tbl->parse, ln, *pos, NULL);
251		else if (rp->last->pos == TBL_CELL_HORIZ ||
252		    rp->last->pos == TBL_CELL_DHORIZ)
253			c = rp->last->pos;
254	} else if (c == TBL_CELL_DOWN && rp == tbl->first_row)
255		mandoc_msg(MANDOCERR_TBLLAYOUT_DOWN,
256		    tbl->parse, ln, *pos, NULL);
257
258	(*pos)++;
259
260	/* Allocate cell then parse its modifiers. */
261
262	mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos);
263}
264
265void
266tbl_layout(struct tbl_node *tbl, int ln, const char *p, int pos)
267{
268	struct tbl_row	*rp;
269
270	rp = NULL;
271	for (;;) {
272		/* Skip whitespace before and after each cell. */
273
274		while (p[pos] == ' ' || p[pos] == '\t')
275			pos++;
276
277		switch (p[pos]) {
278		case ',':  /* Next row on this input line. */
279			pos++;
280			rp = NULL;
281			continue;
282		case '\0':  /* Next row on next input line. */
283			return;
284		case '.':  /* End of layout. */
285			pos++;
286			tbl->part = TBL_PART_DATA;
287
288			/*
289			 * When the layout is completely empty,
290			 * default to one left-justified column.
291			 */
292
293			if (tbl->first_row == NULL) {
294				tbl->first_row = tbl->last_row =
295				    mandoc_calloc(1, sizeof(*rp));
296			}
297			if (tbl->first_row->first == NULL) {
298				mandoc_msg(MANDOCERR_TBLLAYOUT_NONE,
299				    tbl->parse, ln, pos, NULL);
300				cell_alloc(tbl, tbl->first_row,
301				    TBL_CELL_LEFT);
302				if (tbl->opts.lvert < tbl->first_row->vert)
303					tbl->opts.lvert = tbl->first_row->vert;
304				return;
305			}
306
307			/*
308			 * Search for the widest line
309			 * along the left and right margins.
310			 */
311
312			for (rp = tbl->first_row; rp; rp = rp->next) {
313				if (tbl->opts.lvert < rp->vert)
314					tbl->opts.lvert = rp->vert;
315				if (rp->last != NULL &&
316				    rp->last->col + 1 == tbl->opts.cols &&
317				    tbl->opts.rvert < rp->last->vert)
318					tbl->opts.rvert = rp->last->vert;
319
320				/* If the last line is empty, drop it. */
321
322				if (rp->next != NULL &&
323				    rp->next->first == NULL) {
324					free(rp->next);
325					rp->next = NULL;
326					tbl->last_row = rp;
327				}
328			}
329			return;
330		default:  /* Cell. */
331			break;
332		}
333
334		/*
335		 * If the last line had at least one cell,
336		 * start a new one; otherwise, continue it.
337		 */
338
339		if (rp == NULL) {
340			if (tbl->last_row == NULL ||
341			    tbl->last_row->first != NULL) {
342				rp = mandoc_calloc(1, sizeof(*rp));
343				if (tbl->last_row)
344					tbl->last_row->next = rp;
345				else
346					tbl->first_row = rp;
347				tbl->last_row = rp;
348			} else
349				rp = tbl->last_row;
350		}
351		cell(tbl, rp, ln, p, &pos);
352	}
353}
354
355static struct tbl_cell *
356cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
357{
358	struct tbl_cell	*p, *pp;
359
360	p = mandoc_calloc(1, sizeof(*p));
361	p->spacing = SIZE_MAX;
362	p->pos = pos;
363
364	if ((pp = rp->last) != NULL) {
365		pp->next = p;
366		p->col = pp->col + 1;
367	} else
368		rp->first = p;
369	rp->last = p;
370
371	if (tbl->opts.cols <= p->col)
372		tbl->opts.cols = p->col + 1;
373
374	return p;
375}
376