Add initial EQN support to mandoc. This parses, then throws away, data

between EQ and EN roff blocks.  EQN is different from TBL in that data
after .EQ is unilaterally considered an equation until an .EN.  Thus,
there's no need to jump through hoops in having table spans and so on.
This is ONLY the parse code framework in libroff.  EQN is not yet passed
into the backends.

1 files changed, 11 insertions, 0 deletions

diff --git a/libroff.h b/libroff.h
index 9bf9bf9c..c882d487 100644
--- a/libroff.h
+++ b/libroff.h
@@ -43,6 +43,13 @@ struct	tbl_node {
 	struct tbl_node	 *next;
 };
 
+struct	eqn_node {
+	int		  pos; /* invocation column */
+	int		  line; /* invocation line */
+	struct eqn	  eqn;
+	struct eqn_node	 *next;
+};
+
 #define	TBL_MSG(tblp, type, line, col) \
 	(*(tblp)->msg)((type), (tblp)->data, (line), (col), NULL)
 
@@ -57,6 +64,10 @@ int		 tbl_data(struct tbl_node *, int, const char *);
 int		 tbl_cdata(struct tbl_node *, int, const char *);
 const struct tbl_span	*tbl_span(struct tbl_node *);
 void		 tbl_end(struct tbl_node *);
+struct eqn_node	*eqn_alloc(int, int);
+void		 eqn_end(struct eqn_node *);
+void		 eqn_free(struct eqn_node *);
+enum rofferr 	 eqn_read(struct eqn_node **, int, const char *, int);
 
 __END_DECLS