Merge, with considerable changes, tbl.bsd.lv's layout-handling code.

1 files changed, 289 insertions, 0 deletions

diff --git a/tbl_layout.c b/tbl_layout.c
new file mode 100644
index 00000000..004b3337
--- /dev/null
+++ b/tbl_layout.c
@@ -0,0 +1,289 @@
+/*	$Id$ */
+/*
+ * Copyright (c) 2009, 2010 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.
+ */
+#include <assert.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mandoc.h"
+#include "libmandoc.h"
+#include "libroff.h"
+
+struct	tbl_phrase {
+	char		 name;
+	enum tbl_cellt	 key;
+};
+
+#define	KEYS_MAX	 17
+
+static	const struct tbl_phrase keys[KEYS_MAX] = {
+	{ 'c',		 TBL_CELL_CENTRE },
+	{ 'C',		 TBL_CELL_CENTRE },
+	{ 'r',		 TBL_CELL_RIGHT },
+	{ 'R',		 TBL_CELL_RIGHT },
+	{ 'l',		 TBL_CELL_LEFT },
+	{ 'L',		 TBL_CELL_LEFT },
+	{ 'n',		 TBL_CELL_NUMBER },
+	{ 'N',		 TBL_CELL_NUMBER },
+	{ 's',		 TBL_CELL_SPAN },
+	{ 'S',		 TBL_CELL_SPAN },
+	{ 'a',		 TBL_CELL_LONG },
+	{ 'A',		 TBL_CELL_LONG },
+	{ '^',		 TBL_CELL_DOWN },
+	{ '-',		 TBL_CELL_HORIZ },
+	{ '_',		 TBL_CELL_HORIZ },
+	{ '=',		 TBL_CELL_DHORIZ },
+	{ '|',		 TBL_CELL_VERT }
+};
+
+static	int	 mods(struct tbl *, struct tbl_cell *, 
+			int, const char *, int *);
+static	int	 cell(struct tbl *, struct tbl_row *, 
+			int, const char *, int *);
+static	void	 row(struct tbl *, int, const char *, int *);
+
+static int
+mods(struct tbl *tbl, struct tbl_cell *cp, 
+		int ln, const char *p, int *pos)
+{
+	char		 buf[5];
+	int		 i;
+
+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;
+	}
+
+	/* 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) {
+			TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos);
+			return(0);
+		}
+
+		*pos += i;
+		cp->spacing = atoi(buf);
+
+		goto mod;
+		/* NOTREACHED */
+	} 
+
+	/* TODO: GNU has many more extensions. */
+
+	switch (p[(*pos)++]) {
+	case ('z'):
+		/* FALLTHROUGH */
+	case ('Z'):
+		cp->flags |= TBL_CELL_WIGN;
+		goto mod;
+	case ('u'):
+		/* FALLTHROUGH */
+	case ('U'):
+		cp->flags |= TBL_CELL_UP;
+		goto mod;
+	case ('e'):
+		/* FALLTHROUGH */
+	case ('E'):
+		cp->flags |= TBL_CELL_EQUAL;
+		goto mod;
+	case ('t'):
+		/* FALLTHROUGH */
+	case ('T'):
+		cp->flags |= TBL_CELL_TALIGN;
+		goto mod;
+	case ('d'):
+		/* FALLTHROUGH */
+	case ('D'):
+		cp->flags |= TBL_CELL_BALIGN;
+		goto mod;
+	case ('f'):
+		/* FALLTHROUGH */
+	case ('B'):
+		/* FALLTHROUGH */
+	case ('I'):
+		/* FALLTHROUGH */
+	case ('b'):
+		/* FALLTHROUGH */
+	case ('i'):
+		break;
+	default:
+		TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
+		return(0);
+	}
+
+	switch (p[(*pos)++]) {
+	case ('b'):
+		/* FALLTHROUGH */
+	case ('B'):
+		cp->flags |= TBL_CELL_BOLD;
+		goto mod;
+	case ('i'):
+		/* FALLTHROUGH */
+	case ('I'):
+		cp->flags |= TBL_CELL_ITALIC;
+		goto mod;
+	default:
+		break;
+	}
+
+	TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
+	return(0);
+}
+
+static int
+cell(struct tbl *tbl, struct tbl_row *rp, 
+		int ln, const char *p, int *pos)
+{
+	struct tbl_cell	*cp;
+	int		 i;
+	enum tbl_cellt	 c;
+
+	/* Parse the column position (`r', `R', `|', ...). */
+
+	for (i = 0; i < KEYS_MAX; i++)
+		if (p[*pos] == keys[i].name)
+			break;
+
+	if (KEYS_MAX == i) {
+		TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos);
+		return(0);
+	}
+
+	(*pos)++;
+	c = keys[i].key;
+
+	/* 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)) {
+		TBL_MSG(tbl, MANDOCERR_TBLLAYOUT, ln, *pos - 1);
+		return(0);
+	}
+
+	/* Allocate cell then parse its modifiers. */
+
+	cp = mandoc_calloc(1, sizeof(struct tbl_cell));
+	cp->pos = c;
+
+	if (rp->last) {
+		rp->last->next = cp;
+		rp->last = cp;
+	} else
+		rp->last = rp->first = cp;
+
+	return(mods(tbl, cp, ln, p, pos));
+}
+
+
+static void
+row(struct tbl *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) {
+		tbl->last->next = rp;
+		tbl->last = rp;
+	} else
+		tbl->last = tbl->first = 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) 
+			TBL_MSG(tbl, MANDOCERR_TBLNOLAYOUT, ln, *pos);
+		(*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 *tbl, int ln, const char *p)
+{
+	int		 pos;
+
+	pos = 0;
+	row(tbl, ln, p, &pos);
+
+	/* Always succeed. */
+	return(1);
+}