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Diffstat (limited to 'usr/src/cmd/mandoc/tbl_layout.c')
-rw-r--r--usr/src/cmd/mandoc/tbl_layout.c472
1 files changed, 472 insertions, 0 deletions
diff --git a/usr/src/cmd/mandoc/tbl_layout.c b/usr/src/cmd/mandoc/tbl_layout.c
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index 0000000000..7601f146ca
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+++ b/usr/src/cmd/mandoc/tbl_layout.c
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+/* $Id: tbl_layout.c,v 1.22 2011/09/18 14:14:15 schwarze Exp $ */
+/*
+ * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <assert.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "mandoc.h"
+#include "libmandoc.h"
+#include "libroff.h"
+
+struct tbl_phrase {
+ char name;
+ enum tbl_cellt key;
+};
+
+/*
+ * FIXME: we can make this parse a lot nicer by, when an error is
+ * encountered in a layout key, bailing to the next key (i.e. to the
+ * next whitespace then continuing).
+ */
+
+#define KEYS_MAX 11
+
+static const struct tbl_phrase keys[KEYS_MAX] = {
+ { 'c', TBL_CELL_CENTRE },
+ { 'r', TBL_CELL_RIGHT },
+ { 'l', TBL_CELL_LEFT },
+ { 'n', TBL_CELL_NUMBER },
+ { 's', TBL_CELL_SPAN },
+ { 'a', TBL_CELL_LONG },
+ { '^', TBL_CELL_DOWN },
+ { '-', TBL_CELL_HORIZ },
+ { '_', TBL_CELL_HORIZ },
+ { '=', TBL_CELL_DHORIZ },
+ { '|', TBL_CELL_VERT }
+};
+
+static int mods(struct tbl_node *, struct tbl_cell *,
+ int, const char *, int *);
+static int cell(struct tbl_node *, struct tbl_row *,
+ int, const char *, int *);
+static void row(struct tbl_node *, int, const char *, int *);
+static struct tbl_cell *cell_alloc(struct tbl_node *,
+ struct tbl_row *, enum tbl_cellt);
+static void head_adjust(const struct tbl_cell *,
+ struct tbl_head *);
+
+static int
+mods(struct tbl_node *tbl, struct tbl_cell *cp,
+ int ln, const char *p, int *pos)
+{
+ char buf[5];
+ int i;
+
+ /* Not all types accept modifiers. */
+
+ switch (cp->pos) {
+ case (TBL_CELL_DOWN):
+ /* FALLTHROUGH */
+ case (TBL_CELL_HORIZ):
+ /* FALLTHROUGH */
+ case (TBL_CELL_DHORIZ):
+ /* FALLTHROUGH */
+ case (TBL_CELL_VERT):
+ /* FALLTHROUGH */
+ case (TBL_CELL_DVERT):
+ return(1);
+ default:
+ break;
+ }
+
+mod:
+ /*
+ * XXX: since, at least for now, modifiers are non-conflicting
+ * (are separable by value, regardless of position), we let
+ * modifiers come in any order. The existing tbl doesn't let
+ * this happen.
+ */
+ switch (p[*pos]) {
+ case ('\0'):
+ /* FALLTHROUGH */
+ case (' '):
+ /* FALLTHROUGH */
+ case ('\t'):
+ /* FALLTHROUGH */
+ case (','):
+ /* FALLTHROUGH */
+ case ('.'):
+ return(1);
+ default:
+ break;
+ }
+
+ /* Throw away parenthesised expression. */
+
+ if ('(' == p[*pos]) {
+ (*pos)++;
+ while (p[*pos] && ')' != p[*pos])
+ (*pos)++;
+ if (')' == p[*pos]) {
+ (*pos)++;
+ goto mod;
+ }
+ mandoc_msg(MANDOCERR_TBLLAYOUT,
+ tbl->parse, ln, *pos, NULL);
+ return(0);
+ }
+
+ /* Parse numerical spacing from modifier string. */
+
+ if (isdigit((unsigned char)p[*pos])) {
+ for (i = 0; i < 4; i++) {
+ if ( ! isdigit((unsigned char)p[*pos + i]))
+ break;
+ buf[i] = p[*pos + i];
+ }
+ buf[i] = '\0';
+
+ /* No greater than 4 digits. */
+
+ if (4 == i) {
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
+ ln, *pos, NULL);
+ return(0);
+ }
+
+ *pos += i;
+ cp->spacing = (size_t)atoi(buf);
+
+ goto mod;
+ /* NOTREACHED */
+ }
+
+ /* TODO: GNU has many more extensions. */
+
+ switch (tolower((unsigned char)p[(*pos)++])) {
+ case ('z'):
+ cp->flags |= TBL_CELL_WIGN;
+ goto mod;
+ case ('u'):
+ cp->flags |= TBL_CELL_UP;
+ goto mod;
+ case ('e'):
+ cp->flags |= TBL_CELL_EQUAL;
+ goto mod;
+ case ('t'):
+ cp->flags |= TBL_CELL_TALIGN;
+ goto mod;
+ case ('d'):
+ cp->flags |= TBL_CELL_BALIGN;
+ goto mod;
+ case ('w'): /* XXX for now, ignore minimal column width */
+ goto mod;
+ case ('f'):
+ break;
+ case ('r'):
+ /* FALLTHROUGH */
+ case ('b'):
+ /* FALLTHROUGH */
+ case ('i'):
+ (*pos)--;
+ break;
+ default:
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
+ ln, *pos - 1, NULL);
+ return(0);
+ }
+
+ switch (tolower((unsigned char)p[(*pos)++])) {
+ case ('3'):
+ /* FALLTHROUGH */
+ case ('b'):
+ cp->flags |= TBL_CELL_BOLD;
+ goto mod;
+ case ('2'):
+ /* FALLTHROUGH */
+ case ('i'):
+ cp->flags |= TBL_CELL_ITALIC;
+ goto mod;
+ case ('1'):
+ /* FALLTHROUGH */
+ case ('r'):
+ goto mod;
+ default:
+ break;
+ }
+
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
+ ln, *pos - 1, NULL);
+ return(0);
+}
+
+static int
+cell(struct tbl_node *tbl, struct tbl_row *rp,
+ int ln, const char *p, int *pos)
+{
+ int i;
+ enum tbl_cellt c;
+
+ /* Parse the column position (`r', `R', `|', ...). */
+
+ for (i = 0; i < KEYS_MAX; i++)
+ if (tolower((unsigned char)p[*pos]) == keys[i].name)
+ break;
+
+ if (KEYS_MAX == i) {
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
+ ln, *pos, NULL);
+ return(0);
+ }
+
+ c = keys[i].key;
+
+ /*
+ * If a span cell is found first, raise a warning and abort the
+ * parse. If a span cell is found and the last layout element
+ * isn't a "normal" layout, bail.
+ *
+ * FIXME: recover from this somehow?
+ */
+
+ if (TBL_CELL_SPAN == c) {
+ if (NULL == rp->first) {
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
+ ln, *pos, NULL);
+ return(0);
+ } else if (rp->last)
+ switch (rp->last->pos) {
+ case (TBL_CELL_VERT):
+ case (TBL_CELL_DVERT):
+ case (TBL_CELL_HORIZ):
+ case (TBL_CELL_DHORIZ):
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse,
+ ln, *pos, NULL);
+ return(0);
+ default:
+ break;
+ }
+ }
+
+ /*
+ * If a vertical spanner is found, we may not be in the first
+ * row.
+ */
+
+ if (TBL_CELL_DOWN == c && rp == tbl->first_row) {
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos, NULL);
+ return(0);
+ }
+
+ (*pos)++;
+
+ /* Extra check for the double-vertical. */
+
+ if (TBL_CELL_VERT == c && '|' == p[*pos]) {
+ (*pos)++;
+ c = TBL_CELL_DVERT;
+ }
+
+ /* Disallow adjacent spacers. */
+
+ if (rp->last && (TBL_CELL_VERT == c || TBL_CELL_DVERT == c) &&
+ (TBL_CELL_VERT == rp->last->pos ||
+ TBL_CELL_DVERT == rp->last->pos)) {
+ mandoc_msg(MANDOCERR_TBLLAYOUT, tbl->parse, ln, *pos - 1, NULL);
+ return(0);
+ }
+
+ /* Allocate cell then parse its modifiers. */
+
+ return(mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos));
+}
+
+
+static void
+row(struct tbl_node *tbl, int ln, const char *p, int *pos)
+{
+ struct tbl_row *rp;
+
+row: /*
+ * EBNF describing this section:
+ *
+ * row ::= row_list [:space:]* [.]?[\n]
+ * row_list ::= [:space:]* row_elem row_tail
+ * row_tail ::= [:space:]*[,] row_list |
+ * epsilon
+ * row_elem ::= [\t\ ]*[:alpha:]+
+ */
+
+ rp = mandoc_calloc(1, sizeof(struct tbl_row));
+ if (tbl->last_row) {
+ tbl->last_row->next = rp;
+ tbl->last_row = rp;
+ } else
+ tbl->last_row = tbl->first_row = rp;
+
+cell:
+ while (isspace((unsigned char)p[*pos]))
+ (*pos)++;
+
+ /* Safely exit layout context. */
+
+ if ('.' == p[*pos]) {
+ tbl->part = TBL_PART_DATA;
+ if (NULL == tbl->first_row)
+ mandoc_msg(MANDOCERR_TBLNOLAYOUT, tbl->parse,
+ ln, *pos, NULL);
+ (*pos)++;
+ return;
+ }
+
+ /* End (and possibly restart) a row. */
+
+ if (',' == p[*pos]) {
+ (*pos)++;
+ goto row;
+ } else if ('\0' == p[*pos])
+ return;
+
+ if ( ! cell(tbl, rp, ln, p, pos))
+ return;
+
+ goto cell;
+ /* NOTREACHED */
+}
+
+int
+tbl_layout(struct tbl_node *tbl, int ln, const char *p)
+{
+ int pos;
+
+ pos = 0;
+ row(tbl, ln, p, &pos);
+
+ /* Always succeed. */
+ return(1);
+}
+
+static struct tbl_cell *
+cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
+{
+ struct tbl_cell *p, *pp;
+ struct tbl_head *h, *hp;
+
+ p = mandoc_calloc(1, sizeof(struct tbl_cell));
+
+ if (NULL != (pp = rp->last)) {
+ rp->last->next = p;
+ rp->last = p;
+ } else
+ rp->last = rp->first = p;
+
+ p->pos = pos;
+
+ /*
+ * This is a little bit complicated. Here we determine the
+ * header the corresponds to a cell. We add headers dynamically
+ * when need be or re-use them, otherwise. As an example, given
+ * the following:
+ *
+ * 1 c || l
+ * 2 | c | l
+ * 3 l l
+ * 3 || c | l |.
+ *
+ * We first add the new headers (as there are none) in (1); then
+ * in (2) we insert the first spanner (as it doesn't match up
+ * with the header); then we re-use the prior data headers,
+ * skipping over the spanners; then we re-use everything and add
+ * a last spanner. Note that VERT headers are made into DVERT
+ * ones.
+ */
+
+ h = pp ? pp->head->next : tbl->first_head;
+
+ if (h) {
+ /* Re-use data header. */
+ if (TBL_HEAD_DATA == h->pos &&
+ (TBL_CELL_VERT != p->pos &&
+ TBL_CELL_DVERT != p->pos)) {
+ p->head = h;
+ return(p);
+ }
+
+ /* Re-use spanner header. */
+ if (TBL_HEAD_DATA != h->pos &&
+ (TBL_CELL_VERT == p->pos ||
+ TBL_CELL_DVERT == p->pos)) {
+ head_adjust(p, h);
+ p->head = h;
+ return(p);
+ }
+
+ /* Right-shift headers with a new spanner. */
+ if (TBL_HEAD_DATA == h->pos &&
+ (TBL_CELL_VERT == p->pos ||
+ TBL_CELL_DVERT == p->pos)) {
+ hp = mandoc_calloc(1, sizeof(struct tbl_head));
+ hp->ident = tbl->opts.cols++;
+ hp->prev = h->prev;
+ if (h->prev)
+ h->prev->next = hp;
+ if (h == tbl->first_head)
+ tbl->first_head = hp;
+ h->prev = hp;
+ hp->next = h;
+ head_adjust(p, hp);
+ p->head = hp;
+ return(p);
+ }
+
+ if (NULL != (h = h->next)) {
+ head_adjust(p, h);
+ p->head = h;
+ return(p);
+ }
+
+ /* Fall through to default case... */
+ }
+
+ hp = mandoc_calloc(1, sizeof(struct tbl_head));
+ hp->ident = tbl->opts.cols++;
+
+ if (tbl->last_head) {
+ hp->prev = tbl->last_head;
+ tbl->last_head->next = hp;
+ tbl->last_head = hp;
+ } else
+ tbl->last_head = tbl->first_head = hp;
+
+ head_adjust(p, hp);
+ p->head = hp;
+ return(p);
+}
+
+static void
+head_adjust(const struct tbl_cell *cellp, struct tbl_head *head)
+{
+ if (TBL_CELL_VERT != cellp->pos &&
+ TBL_CELL_DVERT != cellp->pos) {
+ head->pos = TBL_HEAD_DATA;
+ return;
+ }
+
+ if (TBL_CELL_VERT == cellp->pos)
+ if (TBL_HEAD_DVERT != head->pos)
+ head->pos = TBL_HEAD_VERT;
+
+ if (TBL_CELL_DVERT == cellp->pos)
+ head->pos = TBL_HEAD_DVERT;
+}
+
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