When support for bold italic font was added to the parsers and to the

generic parts of the formatters some time ago, the PostScript- and
PDF-specific part of the formatters was neglected.

Now pascal@ reports that mandoc -Tps throws an assertion on perl(1),
apparently because that manual actually uses bold italic font.

So here is an overdue implementation of bold italic font support for
PostScript and PDF output.

1 files changed, 139 insertions, 35 deletions

diff --git a/term_ps.c b/term_ps.c
index 24342f74..1ce03e19 100644
--- a/term_ps.c
+++ b/term_ps.c
@@ -67,6 +67,7 @@ struct	termp_ps {
 	size_t		  psmargcur;	/* cur index in margin buf */
 	char		  last;		/* character buffer */
 	enum termfont	  lastf;	/* last set font */
+	enum termfont	  nextf;	/* building next font here */
 	size_t		  scale;	/* font scaling factor */
 	size_t		  pages;	/* number of pages shown */
 	size_t		  lineheight;	/* line height (AFM units) */
@@ -406,6 +407,103 @@ static	const struct font fonts[TERMFONT__MAX] = {
 		{  400 },
 		{  541 },
 	} },
+	{ "Times-BoldItalic", {
+		{  250 },
+		{  389 },
+		{  555 },
+		{  500 },
+		{  500 },
+		{  833 },
+		{  778 },
+		{  333 },
+		{  333 },
+		{  333 },
+		{  500 },
+		{  570 },
+		{  250 },
+		{  333 },
+		{  250 },
+		{  278 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  333 },
+		{  333 },
+		{  570 },
+		{  570 },
+		{  570 },
+		{  500 },
+		{  832 },
+		{  667 },
+		{  667 },
+		{  667 },
+		{  722 },
+		{  667 },
+		{  667 },
+		{  722 },
+		{  778 },
+		{  389 },
+		{  500 },
+		{  667 },
+		{  611 },
+		{  889 },
+		{  722 },
+		{  722 },
+		{  611 },
+		{  722 },
+		{  667 },
+		{  556 },
+		{  611 },
+		{  722 },
+		{  667 },
+		{  889 },
+		{  667 },
+		{  611 },
+		{  611 },
+		{  333 },
+		{  278 },
+		{  333 },
+		{  570 },
+		{  500 },
+		{  333 },
+		{  500 },
+		{  500 },
+		{  444 },
+		{  500 },
+		{  444 },
+		{  333 },
+		{  500 },
+		{  556 },
+		{  278 },
+		{  278 },
+		{  500 },
+		{  278 },
+		{  778 },
+		{  556 },
+		{  500 },
+		{  500 },
+		{  500 },
+		{  389 },
+		{  389 },
+		{  278 },
+		{  556 },
+		{  444 },
+		{  667 },
+		{  500 },
+		{  444 },
+		{  389 },
+		{  348 },
+		{  220 },
+		{  348 },
+		{  570 },
+	} },
 };
 
 void *
@@ -953,11 +1051,13 @@ ps_fclose(struct termp *p)
 	 * Following this, close out any scope that's open.
 	 */
 
-	if ('\0' != p->ps->last) {
-		if (p->ps->lastf != TERMFONT_NONE) {
+	if (p->ps->last != '\0') {
+		assert(p->ps->last != 8);
+		if (p->ps->nextf != p->ps->lastf) {
 			ps_pclose(p);
-			ps_setfont(p, TERMFONT_NONE);
+			ps_setfont(p, p->ps->nextf);
 		}
+		p->ps->nextf = TERMFONT_NONE;
 		ps_pletter(p, p->ps->last);
 		p->ps->last = '\0';
 	}
@@ -971,50 +1071,54 @@ ps_fclose(struct termp *p)
 static void
 ps_letter(struct termp *p, int arg)
 {
-	char		cc, c;
+	char		c;
 
 	c = arg >= 128 || arg <= 0 ? '?' : arg;
 
 	/*
-	 * State machine dictates whether to buffer the last character
-	 * or not.  Basically, encoded words are detected by checking if
-	 * we're an "8" and switching on the buffer.  Then we put "8" in
-	 * our buffer, and on the next charater, flush both character
-	 * and buffer.  Thus, "regular" words are detected by having a
-	 * regular character and a regular buffer character.
+	 * When receiving an initial character, merely buffer it,
+	 * because a backspace might follow to specify formatting.
+	 * When receiving a backspace, use the buffered character
+	 * to build the font instruction and clear the buffer.
+	 * Only when there are two non-backspace characters in a row,
+	 * activate the font built so far and print the first of them;
+	 * the second, again, merely gets buffered.
+	 * The final character will get printed from ps_fclose().
 	 */
 
-	if ('\0' == p->ps->last) {
-		assert(8 != c);
-		p->ps->last = c;
-		return;
-	} else if (8 == p->ps->last) {
-		assert(8 != c);
-		p->ps->last = '\0';
-	} else if (8 == c) {
-		assert(8 != p->ps->last);
+	if (c == 8) {
+		assert(p->ps->last != '\0');
+		assert(p->ps->last != 8);
 		if ('_' == p->ps->last) {
-			if (p->ps->lastf != TERMFONT_UNDER) {
-				ps_pclose(p);
-				ps_setfont(p, TERMFONT_UNDER);
+			switch (p->ps->nextf) {
+			case TERMFONT_BI:
+				break;
+			case TERMFONT_BOLD:
+				p->ps->nextf = TERMFONT_BI;
+				break;
+			default:
+				p->ps->nextf = TERMFONT_UNDER;
+			}
+		} else {
+			switch (p->ps->nextf) {
+			case TERMFONT_BI:
+				break;
+			case TERMFONT_UNDER:
+				p->ps->nextf = TERMFONT_BI;
+				break;
+			default:
+				p->ps->nextf = TERMFONT_BOLD;
 			}
-		} else if (p->ps->lastf != TERMFONT_BOLD) {
-			ps_pclose(p);
-			ps_setfont(p, TERMFONT_BOLD);
 		}
-		p->ps->last = c;
-		return;
-	} else {
-		if (p->ps->lastf != TERMFONT_NONE) {
+	} else if (p->ps->last != '\0' && p->ps->last != 8) {
+		if (p->ps->nextf != p->ps->lastf) {
 			ps_pclose(p);
-			ps_setfont(p, TERMFONT_NONE);
+			ps_setfont(p, p->ps->nextf);
 		}
-		cc = p->ps->last;
-		p->ps->last = c;
-		c = cc;
+		p->ps->nextf = TERMFONT_NONE;
+		ps_pletter(p, p->ps->last);
 	}
-
-	ps_pletter(p, c);
+	p->ps->last = c;
 }
 
 static void