Initial abstraction of front-end decoration events (special characters, text decorations, etc.).

2 files changed, 204 insertions, 0 deletions

diff --git a/out.c b/out.c
index 41904b7e..6165d240 100644
--- a/out.c
+++ b/out.c
@@ -166,3 +166,195 @@ time2a(time_t t, char *dst, size_t sz)
 	(void)strftime(p, sz, "%Y", &tm);
 }
 
+
+/* Returns length of parsed string. */
+int
+a2roffdeco(enum roffdeco *d,
+		const char **word, size_t *sz)
+{
+	int		 j, type, sv, t, lim;
+	const char	*wp;
+
+	*d = DECO_NONE;
+
+	wp = *word;
+	type = 1;
+
+	switch (*wp) {
+	case ('\0'):
+		return(0);
+
+	case ('('):
+		wp++;
+		if ('\0' == *wp)
+			return(1);
+		if ('\0' == *(wp + 1))
+			return(2);
+
+		*d = DECO_SPECIAL;
+		*sz = 2;
+		*word = wp;
+		return(3);
+
+	case ('*'):
+		wp++;
+
+		switch (*wp) {
+		case ('\0'):
+			return(1);
+
+		case ('('):
+			wp++;
+			if ('\0' == *wp)
+				return(2);
+			if ('\0' == *(wp + 1))
+				return(3);
+
+			*d = DECO_RESERVED;
+			*sz = 2;
+			*word = wp;
+			return(4);
+
+		case ('['):
+			type = 0;
+			break;
+
+		default:
+			*d = DECO_RESERVED;
+			*sz = 1;
+			*word = wp;
+			return(3);
+		}
+		break;
+
+#if 0
+	case ('s'):
+		wp++;
+
+		/* This closely follows mandoc_special(). */
+		if ('\0' == *wp) 
+			return(1);
+
+		t = 0;
+		lim = 1;
+
+		if (*wp == '\'') {
+			lim = 0;
+			t = 1;
+			++wp;
+		} else if (*wp == '[') {
+			lim = 0;
+			t = 2;
+			++wp;
+		} else if (*wp == '(') {
+			lim = 2;
+			t = 3;
+			++wp;
+		}
+
+		if (*wp == '+' || *wp == '-')
+			++wp;
+
+		if (*wp == '\'') {
+			if (t) {
+				*word = wp;
+				return;
+			}
+			lim = 0;
+			t = 1;
+			++wp;
+		} else if (*wp == '[') {
+			if (t) {
+				*word = wp;
+				return;
+			}
+			lim = 0;
+			t = 2;
+			++wp;
+		} else if (*wp == '(') {
+			if (t) {
+				*word = wp;
+				return;
+			}
+			lim = 2;
+			t = 3;
+			++wp;
+		}
+
+		if ( ! isdigit((u_char)*wp)) {
+			*word = --wp;
+			return;
+		}
+
+		for (j = 0; isdigit((u_char)*wp); j++) {
+			if (lim && j >= lim)
+				break;
+			++wp;
+		}
+
+		if (t && t < 3) {
+			if (1 == t && *wp != '\'') {
+				*word = --wp;
+				return;
+			}
+			if (2 == t && *wp != ']') {
+				*word = --wp;
+				return;
+			}
+			++wp;
+		}
+		*word = --wp;
+		return;
+#endif
+
+	case ('f'):
+		wp++;
+
+		switch (*wp) {
+		case ('\0'):
+			return(1);
+		case ('3'):
+			/* FALLTHROUGH */
+		case ('B'):
+			*d = DECO_BOLD;
+			break;
+		case ('2'):
+			/* FALLTHROUGH */
+		case ('I'):
+			*d = DECO_ITALIC;
+			break;
+		case ('P'):
+			*d = DECO_PREVIOUS;
+			break;
+		case ('1'):
+			/* FALLTHROUGH */
+		case ('R'):
+			*d = DECO_ROMAN;
+			break;
+		default:
+			break;
+		}
+
+		return(2);
+
+	case ('['):
+		break;
+
+	default:
+		*d = DECO_SPECIAL;
+		*word = wp;
+		*sz = 1;
+		return(1);
+	}
+
+	*word = ++wp;
+	for (j = 0; *wp && ']' != *wp; wp++, j++)
+		/* Loop... */ ;
+
+	if ('\0' == *wp)
+		return(j + 1);
+
+	*d = type ? DECO_SPECIAL : DECO_RESERVED;
+	*sz = j;
+	return (j + 2);
+}
diff --git a/out.h b/out.h
index 92ebbba9..822f9d12 100644
--- a/out.h
+++ b/out.h
@@ -35,6 +35,17 @@ enum	roffscale {
 	SCALE_MAX
 };
 
+enum	roffdeco {
+	DECO_NONE,
+	DECO_SPECIAL,
+	DECO_RESERVED,
+	DECO_BOLD,
+	DECO_ITALIC,
+	DECO_ROMAN,
+	DECO_PREVIOUS,
+	DECO_MAX
+};
+
 struct	roffsu {
 	enum roffscale	  unit;
 	double		  scale;
@@ -54,6 +65,7 @@ struct	roffsu {
 
 int		  a2roffsu(const char *, 
 			struct roffsu *, enum roffscale);
+int		  a2roffdeco(enum roffdeco *, const char **, size_t *);
 void		  time2a(time_t, char *, size_t);
 
 __END_DECLS