===================================================================
RCS file: /cvs/mandoc/eqn.c,v
retrieving revision 1.14
retrieving revision 1.22
diff -u -p -r1.14 -r1.22
--- mandoc/eqn.c	2011/07/21 11:57:56	1.14
+++ mandoc/eqn.c	2011/07/22 00:16:37	1.22
@@ -1,4 +1,4 @@
-/*	$Id: eqn.c,v 1.14 2011/07/21 11:57:56 kristaps Exp $ */
+/*	$Id: eqn.c,v 1.22 2011/07/22 00:16:37 kristaps Exp $ */
 /*
  * Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -19,6 +19,7 @@
 #endif
 
 #include <assert.h>
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -31,9 +32,20 @@
 #define	EQN_NEST_MAX	 128 /* maximum nesting of defines */
 #define	EQN_MSG(t, x)	 mandoc_msg((t), (x)->parse, (x)->eqn.ln, (x)->eqn.pos, NULL)
 
-struct	eqnpart {
+enum	eqn_rest {
+	EQN_DESCOPE,
+	EQN_ERR,
+	EQN_OK,
+	EQN_EOF
+};
+
+struct	eqnstr {
 	const char	*name;
 	size_t		 sz;
+};
+
+struct	eqnpart {
+	struct eqnstr	 str;
 	int		(*fp)(struct eqn_node *);
 };
 
@@ -44,6 +56,7 @@ enum	eqnpartt {
 	EQN__MAX
 };
 
+static	struct eqn_box	*eqn_box_alloc(struct eqn_box *);
 static	void		 eqn_box_free(struct eqn_box *);
 static	struct eqn_def	*eqn_def_find(struct eqn_node *, 
 				const char *, size_t);
@@ -54,14 +67,51 @@ static	const char	*eqn_nexttok(struct eqn_node *, size
 static	const char	*eqn_nextrawtok(struct eqn_node *, size_t *);
 static	const char	*eqn_next(struct eqn_node *, 
 				char, size_t *, int);
-static	int		 eqn_box(struct eqn_node *, struct eqn_box *);
+static	void		 eqn_rewind(struct eqn_node *);
+static	enum eqn_rest	 eqn_eqn(struct eqn_node *, struct eqn_box *);
+static	enum eqn_rest	 eqn_box(struct eqn_node *, struct eqn_box *);
 
 static	const struct eqnpart eqnparts[EQN__MAX] = {
-	{ "define", 6, eqn_do_define }, /* EQN_DEFINE */
-	{ "set", 3, eqn_do_set }, /* EQN_SET */
-	{ "undef", 5, eqn_do_undef }, /* EQN_UNDEF */
+	{ { "define", 6 }, eqn_do_define }, /* EQN_DEFINE */
+	{ { "set", 3 }, eqn_do_set }, /* EQN_SET */
+	{ { "undef", 5 }, eqn_do_undef }, /* EQN_UNDEF */
 };
 
+static	const struct eqnstr eqnmarks[EQNMARK__MAX] = {
+	{ "", 0 }, /* EQNMARK_NONE */
+	{ "dot", 3 }, /* EQNMARK_DOT */
+	{ "dotdot", 6 }, /* EQNMARK_DOTDOT */
+	{ "hat", 3 }, /* EQNMARK_HAT */
+	{ "tilde", 5 }, /* EQNMARK_TILDE */
+	{ "vec", 3 }, /* EQNMARK_VEC */
+	{ "dyad", 4 }, /* EQNMARK_DYAD */
+	{ "bar", 3 }, /* EQNMARK_BAR */
+	{ "under", 5 }, /* EQNMARK_UNDER */
+};
+
+static	const struct eqnstr eqnfonts[EQNFONT__MAX] = {
+	{ "", 0 }, /* EQNFONT_NONE */
+	{ "roman", 5 }, /* EQNFONT_ROMAN */
+	{ "bold", 4 }, /* EQNFONT_BOLD */
+	{ "italic", 6 }, /* EQNFONT_ITALIC */
+};
+
+static	const struct eqnstr eqnposs[EQNPOS__MAX] = {
+	{ "", 0 }, /* EQNPOS_NONE */
+	{ "over", 4 }, /* EQNPOS_OVER */
+	{ "sup", 3 }, /* EQNPOS_SUP */
+	{ "sub", 3 }, /* EQNPOS_SUB */
+	{ "to", 2 }, /* EQNPOS_TO */
+	{ "from", 4 }, /* EQNPOS_FROM */
+};
+
+static	const struct eqnstr eqnpiles[EQNPILE__MAX] = {
+	{ "", 0 }, /* EQNPILE_NONE */
+	{ "cpile", 5 }, /* EQNPILE_CPILE */
+	{ "rpile", 5 }, /* EQNPILE_RPILE */
+	{ "lpile", 5 }, /* EQNPILE_LPILE */
+};
+
 /* ARGSUSED */
 enum rofferr
 eqn_read(struct eqn_node **epp, int ln, 
@@ -120,61 +170,211 @@ enum rofferr
 eqn_end(struct eqn_node *ep)
 {
 	struct eqn_box	*root;
+	enum eqn_rest	 c;
 
-	ep->eqn.root = root = 
-		mandoc_calloc(1, sizeof(struct eqn_box));
+	ep->eqn.root = mandoc_calloc(1, sizeof(struct eqn_box));
+
+	root = ep->eqn.root;
 	root->type = EQN_ROOT;
 
 	if (0 == ep->sz)
 		return(ROFF_IGN);
 
-	/*
-	 * Validate the expression.
-	 * Use the grammar found in the literature.
-	 */
+	if (EQN_DESCOPE == (c = eqn_eqn(ep, root))) {
+		EQN_MSG(MANDOCERR_EQNNSCOPE, ep);
+		c = EQN_ERR;
+	}
 
-	return(eqn_box(ep, root) < 0 ? ROFF_IGN : ROFF_EQN);
+	return(EQN_EOF == c ? ROFF_EQN : ROFF_IGN);
 }
 
-static int
+static enum eqn_rest
+eqn_eqn(struct eqn_node *ep, struct eqn_box *last)
+{
+	struct eqn_box	*bp;
+	enum eqn_rest	 c;
+
+	bp = eqn_box_alloc(last);
+	bp->type = EQN_SUBEXPR;
+
+	while (EQN_OK == (c = eqn_box(ep, bp)))
+		/* Spin! */ ;
+
+	return(c);
+}
+
+static enum eqn_rest
 eqn_box(struct eqn_node *ep, struct eqn_box *last)
 {
 	size_t		 sz;
 	const char	*start;
-	int		 i, nextc;
+	char		*left;
+	enum eqn_rest	 c;
+	int		 i, size;
 	struct eqn_box	*bp;
 
-	nextc = 1;
-again:
 	if (NULL == (start = eqn_nexttok(ep, &sz)))
-		return(0);
+		return(EQN_EOF);
 
+	if (1 == sz && 0 == strncmp("}", start, 1))
+		return(EQN_DESCOPE);
+	else if (5 == sz && 0 == strncmp("right", start, 5))
+		return(EQN_DESCOPE);
+	else if (5 == sz && 0 == strncmp("above", start, 5))
+		return(EQN_DESCOPE);
+
 	for (i = 0; i < (int)EQN__MAX; i++) {
-		if (eqnparts[i].sz != sz)
+		if (eqnparts[i].str.sz != sz)
 			continue;
-		if (strncmp(eqnparts[i].name, start, sz))
+		if (strncmp(eqnparts[i].str.name, start, sz))
 			continue;
-		if ( ! (*eqnparts[i].fp)(ep))
-			return(-1);
+		return((*eqnparts[i].fp)(ep) ? EQN_OK : EQN_ERR);
+	} 
 
-		goto again;
+	if (1 == sz && 0 == strncmp("{", start, 1)) {
+		if (EQN_DESCOPE != (c = eqn_eqn(ep, last))) {
+			if (EQN_ERR != c)
+				EQN_MSG(MANDOCERR_EQNSCOPE, ep);
+			return(EQN_ERR);
+		}
+		eqn_rewind(ep);
+		start = eqn_nexttok(ep, &sz);
+		assert(start);
+		if (1 == sz && 0 == strncmp("}", start, 1))
+			return(EQN_OK);
+		EQN_MSG(MANDOCERR_EQNBADSCOPE, ep);
+		return(EQN_ERR);
 	} 
 
-	bp = mandoc_calloc(1, sizeof(struct eqn_box));
-	bp->type = EQN_TEXT;
+	for (i = 0; i < (int)EQNPILE__MAX; i++) {
+		if (eqnpiles[i].sz != sz)
+			continue;
+		if (strncmp(eqnpiles[i].name, start, sz))
+			continue;
+		if (NULL == (start = eqn_nexttok(ep, &sz))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		}
+		if (1 != sz || strncmp("{", start, 1)) {
+			EQN_MSG(MANDOCERR_EQNSYNT, ep);
+			return(EQN_ERR);
+		}
 
-	if (nextc)
-		last->child = bp;
-	else
-		last->next = bp;
+		while (EQN_DESCOPE == (c = eqn_eqn(ep, last))) {
+			assert(last->last);
+			last->last->pile = (enum eqn_pilet)i;
+			eqn_rewind(ep);
+			start = eqn_nexttok(ep, &sz);
+			assert(start);
+			if (5 != sz || strncmp("above", start, 5))
+				break;
+			last->last->above = 1;
+		}
 
-	bp->text = mandoc_malloc(sz + 1);
-	*bp->text = '\0';
-	strlcat(bp->text, start, sz + 1);
+		if (EQN_DESCOPE != c) {
+			if (EQN_ERR != c)
+				EQN_MSG(MANDOCERR_EQNSCOPE, ep);
+			return(EQN_ERR);
+		}
 
-	last = bp;
-	nextc = 0;
-	goto again;
+		eqn_rewind(ep);
+		start = eqn_nexttok(ep, &sz);
+		assert(start);
+		if (1 == sz && 0 == strncmp("}", start, 1))
+			return(EQN_OK);
+
+		EQN_MSG(MANDOCERR_EQNBADSCOPE, ep);
+		return(EQN_ERR);
+	}
+
+	if (4 == sz && 0 == strncmp("left", start, 4)) {
+		if (NULL == (start = eqn_nexttok(ep, &sz))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		}
+		left = mandoc_strndup(start, sz);
+		if (EQN_DESCOPE != (c = eqn_eqn(ep, last)))
+			return(c);
+		assert(last->last);
+		last->last->left = left;
+		eqn_rewind(ep);
+		start = eqn_nexttok(ep, &sz);
+		assert(start);
+		if (5 != sz || strncmp("right", start, 5))
+			return(EQN_DESCOPE);
+		if (NULL == (start = eqn_nexttok(ep, &sz))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		}
+		last->last->right = mandoc_strndup(start, sz);
+		return(EQN_OK);
+	}
+
+	for (i = 0; i < (int)EQNPOS__MAX; i++) {
+		if (eqnposs[i].sz != sz)
+			continue;
+		if (strncmp(eqnposs[i].name, start, sz))
+			continue;
+		if (NULL == last->last) {
+			EQN_MSG(MANDOCERR_EQNSYNT, ep);
+			return(EQN_ERR);
+		} 
+		last->last->pos = (enum eqn_post)i;
+		if (EQN_EOF == (c = eqn_box(ep, last))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		}
+		return(c);
+	}
+
+	for (i = 0; i < (int)EQNMARK__MAX; i++) {
+		if (eqnmarks[i].sz != sz)
+			continue;
+		if (strncmp(eqnmarks[i].name, start, sz))
+			continue;
+		if (NULL == last->last) {
+			EQN_MSG(MANDOCERR_EQNSYNT, ep);
+			return(EQN_ERR);
+		} 
+		last->last->mark = (enum eqn_markt)i;
+		if (EQN_EOF == (c = eqn_box(ep, last))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		}
+		return(c);
+	}
+
+	for (i = 0; i < (int)EQNFONT__MAX; i++) {
+		if (eqnfonts[i].sz != sz)
+			continue;
+		if (strncmp(eqnfonts[i].name, start, sz))
+			continue;
+		if (EQN_EOF == (c = eqn_box(ep, last))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		} else if (EQN_OK == c)
+			last->last->font = (enum eqn_fontt)i;
+		return(c);
+	}
+
+	if (4 == sz && 0 == strncmp("size", start, 4)) {
+		if (NULL == (start = eqn_nexttok(ep, &sz))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		}
+		size = mandoc_strntoi(start, sz, 10);
+		if (EQN_EOF == (c = eqn_box(ep, last))) {
+			EQN_MSG(MANDOCERR_EQNEOF, ep);
+			return(EQN_ERR);
+		} else if (EQN_OK != c)
+			return(c);
+		last->last->size = size;
+	}
+
+	bp = eqn_box_alloc(last);
+	bp->type = EQN_TEXT;
+	bp->text = mandoc_strndup(start, sz);
+	return(EQN_OK);
 }
 
 void
@@ -194,16 +394,36 @@ eqn_free(struct eqn_node *p)
 	free(p);
 }
 
+static struct eqn_box *
+eqn_box_alloc(struct eqn_box *parent)
+{
+	struct eqn_box	*bp;
+
+	bp = mandoc_calloc(1, sizeof(struct eqn_box));
+	bp->parent = parent;
+	bp->size = EQN_DEFSIZE;
+
+	if (NULL == parent->first)
+		parent->first = bp;
+	else
+		parent->last->next = bp;
+
+	parent->last = bp;
+	return(bp);
+}
+
 static void
 eqn_box_free(struct eqn_box *bp)
 {
 
-	if (bp->child)
-		eqn_box_free(bp->child);
+	if (bp->first)
+		eqn_box_free(bp->first);
 	if (bp->next)
 		eqn_box_free(bp->next);
 
 	free(bp->text);
+	free(bp->left);
+	free(bp->right);
 	free(bp);
 }
 
@@ -221,19 +441,26 @@ eqn_nexttok(struct eqn_node *ep, size_t *sz)
 	return(eqn_next(ep, '"', sz, 1));
 }
 
+static void
+eqn_rewind(struct eqn_node *ep)
+{
+
+	ep->cur = ep->rew;
+}
+
 static const char *
 eqn_next(struct eqn_node *ep, char quote, size_t *sz, int repl)
 {
 	char		*start, *next;
 	int		 q, diff, lim;
-	size_t		 sv, ssz;
+	size_t		 ssz, dummy;
 	struct eqn_def	*def;
 
 	if (NULL == sz)
-		sz = &ssz;
+		sz = &dummy;
 
 	lim = 0;
-	sv = ep->cur;
+	ep->rew = ep->cur;
 again:
 	/* Prevent self-definitions. */
 
@@ -242,7 +469,7 @@ again:
 		return(NULL);
 	}
 
-	ep->cur = sv;
+	ep->cur = ep->rew;
 	start = &ep->data[(int)ep->cur];
 	q = 0;
 
@@ -255,14 +482,26 @@ again:
 	}
 
 	start = &ep->data[(int)ep->cur];
-	next = q ? strchr(start, quote) : strchr(start, ' ');
 
+	if ( ! q) {
+		if ('{' == *start || '}' == *start)
+			ssz = 1;
+		else
+			ssz = strcspn(start + 1, " ~\"{}\t") + 1;
+		next = start + (int)ssz;
+		if ('\0' == *next)
+			next = NULL;
+	} else
+		next = strchr(start, quote);
+
 	if (NULL != next) {
 		*sz = (size_t)(next - start);
 		ep->cur += *sz;
 		if (q)
 			ep->cur++;
-		while (' ' == ep->data[(int)ep->cur])
+		while (' ' == ep->data[(int)ep->cur] ||
+				'\t' == ep->data[(int)ep->cur] ||
+				'~' == ep->data[(int)ep->cur])
 			ep->cur++;
 	} else {
 		if (q)
@@ -284,7 +523,7 @@ again:
 			ep->sz += diff;
 			ep->data = mandoc_realloc(ep->data, ep->sz + 1);
 			ep->data[ep->sz] = '\0';
-			start = &ep->data[(int)sv];
+			start = &ep->data[(int)ep->rew];
 		}
 
 		diff = def->valsz - *sz;