===================================================================
RCS file: /cvs/mandoc/term.c,v
retrieving revision 1.119
retrieving revision 1.129
diff -u -p -r1.119 -r1.129
--- mandoc/term.c	2009/10/30 18:53:09	1.119
+++ mandoc/term.c	2010/03/23 12:42:22	1.129
@@ -1,4 +1,4 @@
-/*	$Id: term.c,v 1.119 2009/10/30 18:53:09 kristaps Exp $ */
+/*	$Id: term.c,v 1.129 2010/03/23 12:42:22 kristaps Exp $ */
 /*
  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
  *
@@ -14,7 +14,14 @@
  * 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 <sys/types.h>
+
 #include <assert.h>
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -27,21 +34,16 @@
 #include "mdoc.h"
 #include "main.h"
 
-/* FIXME: accomodate non-breaking, non-collapsing white-space. */
-/* FIXME: accomodate non-breaking, collapsing white-space. */
-
 static	struct termp	 *term_alloc(enum termenc);
 static	void		  term_free(struct termp *);
+static	void		  spec(struct termp *, const char *, size_t);
+static	void		  res(struct termp *, const char *, size_t);
+static	void		  buffera(struct termp *, const char *, size_t);
+static	void		  bufferc(struct termp *, char);
+static	void		  adjbuf(struct termp *p, size_t);
+static	void		  encode(struct termp *, const char *, size_t);
 
-static	void		  do_escaped(struct termp *, const char **);
-static	void		  do_special(struct termp *,
-				const char *, size_t);
-static	void		  do_reserved(struct termp *,
-				const char *, size_t);
-static	void		  buffer(struct termp *, char);
-static	void		  encode(struct termp *, char);
 
-
 void *
 ascii_alloc(void)
 {
@@ -78,10 +80,9 @@ term_alloc(enum termenc enc)
 
 	p = calloc(1, sizeof(struct termp));
 	if (NULL == p) {
-		fprintf(stderr, "memory exhausted\n");
+		perror(NULL);
 		exit(EXIT_FAILURE);
 	}
-	p->maxrmargin = 78;
 	p->enc = enc;
 	return(p);
 }
@@ -134,7 +135,6 @@ term_flushln(struct termp *p)
 	size_t		 bp;    /* visual right border position */
 	int		 j;     /* temporary loop index */
 	size_t		 maxvis, mmax;
-	static int	 overstep = 0;
 
 	/*
 	 * First, establish the maximum columns of "visible" content.
@@ -145,12 +145,12 @@ term_flushln(struct termp *p)
 
 	assert(p->offset < p->rmargin);
 
-	maxvis = (int)(p->rmargin - p->offset) - overstep < 0 ?
+	maxvis = (int)(p->rmargin - p->offset) - p->overstep < 0 ?
 		/* LINTED */ 
-		0 : p->rmargin - p->offset - overstep;
-	mmax = (int)(p->maxrmargin - p->offset) - overstep < 0 ?
+		0 : p->rmargin - p->offset - p->overstep;
+	mmax = (int)(p->maxrmargin - p->offset) - p->overstep < 0 ?
 		/* LINTED */
-		0 : p->maxrmargin - p->offset - overstep;
+		0 : p->maxrmargin - p->offset - p->overstep;
 
 	bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
 
@@ -213,10 +213,10 @@ term_flushln(struct termp *p)
 					putchar(' ');
 				vis = 0;
 			}
-			/* Remove the overstep width. */
+			/* Remove the p->overstep width. */
 			bp += (int)/* LINTED */
-				overstep;
-			overstep = 0;
+				p->overstep;
+			p->overstep = 0;
 		} else {
 			for (j = 0; j < (int)vbl; j++)
 				putchar(' ');
@@ -229,13 +229,18 @@ term_flushln(struct termp *p)
 		for ( ; i < (int)p->col; i++) {
 			if (' ' == p->buf[i])
 				break;
-			putchar(p->buf[i]);
+
+			/* The unit sep. is a non-breaking space. */
+			if (31 == p->buf[i])
+				putchar(' ');
+			else
+				putchar(p->buf[i]);
 		}
 		vis += vsz;
 	}
 
 	p->col = 0;
-	overstep = 0;
+	p->overstep = 0;
 
 	if ( ! (TERMP_NOBREAK & p->flags)) {
 		putchar('\n');
@@ -244,7 +249,7 @@ term_flushln(struct termp *p)
 
 	if (TERMP_HANG & p->flags) {
 		/* We need one blank after the tag. */
-		overstep = /* LINTED */
+		p->overstep = /* LINTED */
 			vis - maxvis + 1;
 
 		/*
@@ -257,12 +262,12 @@ term_flushln(struct termp *p)
 		 * move it one step LEFT and flag the rest of the line
 		 * to be longer.
 		 */
-		if (overstep >= -1) {
-			assert((int)maxvis + overstep >= 0);
+		if (p->overstep >= -1) {
+			assert((int)maxvis + p->overstep >= 0);
 			/* LINTED */
-			maxvis += overstep;
+			maxvis += p->overstep;
 		} else
-			overstep = 0;
+			p->overstep = 0;
 
 	} else if (TERMP_DANGLE & p->flags)
 		return;
@@ -315,155 +320,94 @@ term_vspace(struct termp *p)
 
 
 static void
-do_special(struct termp *p, const char *word, size_t len)
+spec(struct termp *p, const char *word, size_t len)
 {
 	const char	*rhs;
 	size_t		 sz;
-	int		 i;
 
 	rhs = chars_a2ascii(p->symtab, word, len, &sz);
-
-	if (NULL == rhs) {
-#if 0
-		fputs("Unknown special character: ", stderr);
-		for (i = 0; i < (int)len; i++)
-			fputc(word[i], stderr);
-		fputc('\n', stderr);
-#endif
-		return;
-	}
-	for (i = 0; i < (int)sz; i++) 
-		encode(p, rhs[i]);
+	if (rhs) 
+		encode(p, rhs, sz);
 }
 
 
 static void
-do_reserved(struct termp *p, const char *word, size_t len)
+res(struct termp *p, const char *word, size_t len)
 {
 	const char	*rhs;
 	size_t		 sz;
-	int		 i;
 
 	rhs = chars_a2res(p->symtab, word, len, &sz);
+	if (rhs)
+		encode(p, rhs, sz);
+}
 
-	if (NULL == rhs) {
-#if 0
-		fputs("Unknown reserved word: ", stderr);
-		for (i = 0; i < (int)len; i++)
-			fputc(word[i], stderr);
-		fputc('\n', stderr);
-#endif
-		return;
-	}
-	for (i = 0; i < (int)sz; i++) 
-		encode(p, rhs[i]);
+
+void
+term_fontlast(struct termp *p)
+{
+	enum termfont	 f;
+
+	f = p->fontl;
+	p->fontl = p->fontq[p->fonti];
+	p->fontq[p->fonti] = f;
 }
 
 
-/*
- * Handle an escape sequence: determine its length and pass it to the
- * escape-symbol look table.  Note that we assume mdoc(3) has validated
- * the escape sequence (we assert upon badly-formed escape sequences).
- */
-static void
-do_escaped(struct termp *p, const char **word)
+void
+term_fontrepl(struct termp *p, enum termfont f)
 {
-	int		 j, type;
-	const char	*wp;
 
-	wp = *word;
-	type = 1;
+	p->fontl = p->fontq[p->fonti];
+	p->fontq[p->fonti] = f;
+}
 
-	if (0 == *(++wp)) {
-		*word = wp;
-		return;
-	}
 
-	if ('(' == *wp) {
-		wp++;
-		if (0 == *wp || 0 == *(wp + 1)) {
-			*word = 0 == *wp ? wp : wp + 1;
-			return;
-		}
+void
+term_fontpush(struct termp *p, enum termfont f)
+{
 
-		do_special(p, wp, 2);
-		*word = ++wp;
-		return;
+	assert(p->fonti + 1 < 10);
+	p->fontl = p->fontq[p->fonti];
+	p->fontq[++p->fonti] = f;
+}
 
-	} else if ('*' == *wp) {
-		if (0 == *(++wp)) {
-			*word = wp;
-			return;
-		}
 
-		switch (*wp) {
-		case ('('):
-			wp++;
-			if (0 == *wp || 0 == *(wp + 1)) {
-				*word = 0 == *wp ? wp : wp + 1;
-				return;
-			}
+const void *
+term_fontq(struct termp *p)
+{
 
-			do_reserved(p, wp, 2);
-			*word = ++wp;
-			return;
-		case ('['):
-			type = 0;
-			break;
-		default:
-			do_reserved(p, wp, 1);
-			*word = wp;
-			return;
-		}
-	
-	} else if ('f' == *wp) {
-		if (0 == *(++wp)) {
-			*word = wp;
-			return;
-		}
+	return(&p->fontq[p->fonti]);
+}
 
-		switch (*wp) {
-		case ('B'):
-			p->bold++;
-			break;
-		case ('I'):
-			p->under++;
-			break;
-		case ('P'):
-			/* FALLTHROUGH */
-		case ('R'):
-			p->bold = p->under = 0;
-			break;
-		default:
-			break;
-		}
 
-		*word = wp;
-		return;
+enum termfont
+term_fonttop(struct termp *p)
+{
 
-	} else if ('[' != *wp) {
-		do_special(p, wp, 1);
-		*word = wp;
-		return;
-	}
+	return(p->fontq[p->fonti]);
+}
 
-	wp++;
-	for (j = 0; *wp && ']' != *wp; wp++, j++)
-		/* Loop... */ ;
 
-	if (0 == *wp) {
-		*word = wp;
-		return;
-	}
+void
+term_fontpopq(struct termp *p, const void *key)
+{
 
-	if (type)
-		do_special(p, wp - j, (size_t)j);
-	else
-		do_reserved(p, wp - j, (size_t)j);
-	*word = wp;
+	while (p->fonti >= 0 && key != &p->fontq[p->fonti])
+		p->fonti--;
+	assert(p->fonti >= 0);
 }
 
 
+void
+term_fontpop(struct termp *p)
+{
+
+	assert(p->fonti);
+	p->fonti--;
+}
+
+
 /*
  * Handle pwords, partial words, which may be either a single word or a
  * phrase that cannot be broken down (such as a literal string).  This
@@ -472,11 +416,14 @@ do_escaped(struct termp *p, const char **word)
 void
 term_word(struct termp *p, const char *word)
 {
-	const char	 *sv;
+	const char	*sv, *seq;
+	int		 sz;
+	size_t		 ssz;
+	enum roffdeco	 deco;
 
 	sv = word;
 
-	if (word[0] && 0 == word[1])
+	if (word[0] && '\0' == word[1])
 		switch (word[0]) {
 		case('.'):
 			/* FALLTHROUGH */
@@ -503,17 +450,51 @@ term_word(struct termp *p, const char *word)
 		}
 
 	if ( ! (TERMP_NOSPACE & p->flags))
-		buffer(p, ' ');
+		bufferc(p, ' ');
 
 	if ( ! (p->flags & TERMP_NONOSPACE))
 		p->flags &= ~TERMP_NOSPACE;
 
-	for ( ; *word; word++)
-		if ('\\' != *word)
-			encode(p, *word);
-		else
-			do_escaped(p, &word);
+	/* FIXME: use strcspn. */
 
+	while (*word) {
+		if ('\\' != *word) {
+			encode(p, word, 1);
+			word++;
+			continue;
+		}
+
+		seq = ++word;
+		sz = a2roffdeco(&deco, &seq, &ssz);
+
+		switch (deco) {
+		case (DECO_RESERVED):
+			res(p, seq, ssz);
+			break;
+		case (DECO_SPECIAL):
+			spec(p, seq, ssz);
+			break;
+		case (DECO_BOLD):
+			term_fontrepl(p, TERMFONT_BOLD);
+			break;
+		case (DECO_ITALIC):
+			term_fontrepl(p, TERMFONT_UNDER);
+			break;
+		case (DECO_ROMAN):
+			term_fontrepl(p, TERMFONT_NONE);
+			break;
+		case (DECO_PREVIOUS):
+			term_fontlast(p);
+			break;
+		default:
+			break;
+		}
+
+		word += sz;
+		if (DECO_NOSPACE == deco && '\0' == *word)
+			p->flags |= TERMP_NOSPACE;
+	}
+
 	if (sv[0] && 0 == sv[1])
 		switch (sv[0]) {
 		case('('):
@@ -529,46 +510,77 @@ term_word(struct termp *p, const char *word)
 }
 
 
-/*
- * Insert a single character into the line-buffer.  If the buffer's
- * space is exceeded, then allocate more space by doubling the buffer
- * size.
- */
 static void
-buffer(struct termp *p, char c)
+adjbuf(struct termp *p, size_t sz)
 {
-	size_t		 s;
 
-	if (p->col + 1 >= p->maxcols) {
-		if (0 == p->maxcols)
-			p->maxcols = 256;
-		s = p->maxcols * 2;
-		p->buf = realloc(p->buf, s);
-		if (NULL == p->buf) {
-			fprintf(stderr, "memory exhausted\n");
-			exit(EXIT_FAILURE);
-		}
-		p->maxcols = s;
+	if (0 == p->maxcols)
+		p->maxcols = 1024;
+	while (sz >= p->maxcols)
+		p->maxcols <<= 2;
+
+	p->buf = realloc(p->buf, p->maxcols);
+	if (NULL == p->buf) {
+		perror(NULL);
+		exit(EXIT_FAILURE);
 	}
-	p->buf[(int)(p->col)++] = c;
 }
 
 
 static void
-encode(struct termp *p, char c)
+buffera(struct termp *p, const char *word, size_t sz)
 {
-	
-	if (' ' != c) {
-		if (p->under) {
-			buffer(p, '_');
-			buffer(p, 8);
+
+	if (p->col + sz >= p->maxcols) 
+		adjbuf(p, p->col + sz);
+
+	memcpy(&p->buf[(int)p->col], word, sz);
+	p->col += sz;
+}
+
+
+static void
+bufferc(struct termp *p, char c)
+{
+
+	if (p->col + 1 >= p->maxcols)
+		adjbuf(p, p->col + 1);
+
+	p->buf[(int)p->col++] = c;
+}
+
+
+static void
+encode(struct termp *p, const char *word, size_t sz)
+{
+	enum termfont	  f;
+	int		  i;
+
+	/*
+	 * Encode and buffer a string of characters.  If the current
+	 * font mode is unset, buffer directly, else encode then buffer
+	 * character by character.
+	 */
+
+	if (TERMFONT_NONE == (f = term_fonttop(p))) {
+		buffera(p, word, sz);
+		return;
+	}
+
+	for (i = 0; i < (int)sz; i++) {
+		if ( ! isgraph((u_char)word[i])) {
+			bufferc(p, word[i]);
+			continue;
 		}
-		if (p->bold) {
-			buffer(p, c);
-			buffer(p, 8);
-		}
+
+		if (TERMFONT_UNDER == f)
+			bufferc(p, '_');
+		else
+			bufferc(p, word[i]);
+
+		bufferc(p, 8);
+		bufferc(p, word[i]);
 	}
-	buffer(p, c);
 }