===================================================================
RCS file: /cvs/mandoc/mandoc.h,v
retrieving revision 1.85
retrieving revision 1.91
diff -u -p -r1.85 -r1.91
--- mandoc/mandoc.h	2011/07/21 13:18:24	1.85
+++ mandoc/mandoc.h	2011/07/22 14:55:07	1.91
@@ -1,4 +1,4 @@
-/*	$Id: mandoc.h,v 1.85 2011/07/21 13:18:24 kristaps Exp $ */
+/*	$Id: mandoc.h,v 1.91 2011/07/22 14:55:07 kristaps Exp $ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -110,10 +110,12 @@ enum	mandocerr {
 	MANDOCERR_ERROR, /* ===== start of errors ===== */
 
 	/* related to equations */
-	MANDOCERR_EQNARGS, /* bad equation macro arguments */
 	MANDOCERR_EQNNEST, /* too many nested equation defines */
 	MANDOCERR_EQNNSCOPE, /* unexpected equation scope closure*/
 	MANDOCERR_EQNSCOPE, /* equation scope open on exit */
+	MANDOCERR_EQNBADSCOPE, /* overlapping equation scopes */
+	MANDOCERR_EQNEOF, /* unexpected end of equation */
+	MANDOCERR_EQNSYNT, /* equation syntax error */
 
 	/* related to tables */
 	MANDOCERR_TBL, /* bad table syntax */
@@ -282,7 +284,8 @@ struct	tbl_span {
 enum	eqn_boxt {
 	EQN_ROOT, /* root of parse tree */
 	EQN_TEXT, /* text (number, variable, whatever) */
-	EQN_SUBEXPR /* nested subexpression */
+	EQN_SUBEXPR, /* nested `eqn' subexpression */
+	EQN_LIST /* list of subexpressions */
 };
 
 enum	eqn_markt {
@@ -298,18 +301,58 @@ enum	eqn_markt {
 	EQNMARK__MAX
 };
 
-/*
+enum	eqn_fontt {
+	EQNFONT_NONE = 0,
+	EQNFONT_ROMAN,
+	EQNFONT_BOLD,
+	EQNFONT_ITALIC,
+	EQNFONT__MAX
+};
+
+enum	eqn_post {
+	EQNPOS_NONE = 0,
+	EQNPOS_OVER,
+	EQNPOS_SUP,
+	EQNPOS_SUB,
+	EQNPOS_TO,
+	EQNPOS_FROM,
+	EQNPOS__MAX
+};
+
+enum	eqn_pilet {
+	EQNPILE_NONE = 0,
+	EQNPILE_CPILE,
+	EQNPILE_RPILE,
+	EQNPILE_LPILE,
+	EQNPILE__MAX
+};
+
+ /*
  * A "box" is a parsed mathematical expression as defined by the eqn.7
  * grammar.
  */
 struct	eqn_box {
+	int		  size; /* font size of expression */
+#define	EQN_DEFSIZE	  INT_MIN
 	enum eqn_boxt	  type; /* type of node */
-	struct eqn_box	 *child; /* child node */
-	struct eqn_box	 *next; /* next in tree */
+	struct eqn_box	 *first; /* first child node */
+	struct eqn_box	 *last; /* last child node */
+	struct eqn_box	 *next; /* node sibling */
+	struct eqn_box	 *parent; /* node sibling */
 	char		 *text; /* text (or NULL) */
-	enum eqn_markt	  mark; /* whether 'marked' */
+	char		 *left;
+	char		 *right;
+	enum eqn_post	  pos; /* position of next box */
+	enum eqn_markt	  mark; /* a mark about the box */
+	enum eqn_fontt	  font; /* font of box */
+	enum eqn_pilet	  pile; /* equation piling */
+	int		  above; /* next node is above */
 };
 
+/*
+ * An equation consists of a tree of expressions starting at a given
+ * line and position. 
+ */
 struct	eqn {
 	struct eqn_box	 *root; /* root mathematical expression */
 	int		  ln; /* invocation line */
@@ -364,6 +407,7 @@ void		 *mandoc_calloc(size_t, size_t);
 void		 *mandoc_malloc(size_t);
 void		 *mandoc_realloc(void *, size_t);
 char		 *mandoc_strdup(const char *);
+char		 *mandoc_strndup(const char *, size_t);
 
 enum mandoc_esc	  mandoc_escape(const char **, const char **, int *);