Implement in-line equations, much needed by Xenocara manuals.

Put the steering into the roff parser rather than into the mdoc
parser such that it works for all macro languages and on both text
and macro lines.
Line breaks and blank characters generated before and after in-line
equations are not perfect yet, but let's do one thing at a time.

1 files changed, 14 insertions, 10 deletions

diff --git a/libroff.h b/libroff.h
index 465d2da9..03619c82 100644
--- a/libroff.h
+++ b/libroff.h
@@ -1,6 +1,7 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2014 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -43,16 +44,19 @@ struct	tbl_node {
 };
 
 struct	eqn_node {
-	struct eqn_def	 *defs;
-	size_t		  defsz;
-	char		 *data;
-	size_t		  rew;
-	size_t		  cur;
-	size_t		  sz;
-	int		  gsize;
-	struct eqn	  eqn;
-	struct mparse	 *parse;
-	struct eqn_node  *next;
+	struct eqn	  eqn;    /* syntax tree of this equation */
+	struct mparse	 *parse;  /* main parser, for error reporting */
+	struct eqn_node  *next;   /* singly linked list of equations */
+	struct eqn_def	 *defs;   /* array of definitions */
+	char		 *data;   /* source code of this equation */
+	size_t		  defsz;  /* number of definitions */
+	size_t		  sz;     /* length of the source code */
+	size_t		  cur;    /* parse point in the source code */
+	size_t		  rew;    /* beginning of the current token */
+	int		  gsize;  /* default point size */
+	int		  delim;  /* in-line delimiters enabled */
+	char		  odelim; /* in-line opening delimiter */
+	char		  cdelim; /* in-line closing delimiter */
 };
 
 struct	eqn_def {