Flip eqn into using parsed nodes. I've temporarily disabled printing

these in the front-ends except for -Ttree, which will display the parsed
tree.

While here, fix that quoted strings aren't scanned for replacement parts.

1 files changed, 13 insertions, 2 deletions

diff --git a/mandoc.h b/mandoc.h
index b16b1fc9..e6ee928a 100644
--- a/mandoc.h
+++ b/mandoc.h
@@ -277,9 +277,20 @@ struct	tbl_span {
 	struct tbl_span	 *next;
 };
 
+enum	eqn_boxt {
+	EQN_ROOT,
+	EQN_TEXT
+};
+
+struct	eqn_box {
+	enum eqn_boxt	  type;
+	struct eqn_box	 *child;
+	struct eqn_box	 *next;
+	char		 *text;
+};
+
 struct	eqn {
-	size_t		  sz;
-	char		 *data;
+	struct eqn_box	 *root;
 	int		  ln; /* invocation line */
 	int		  pos; /* invocation position */
 };