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, 27 insertions, 1 deletions

diff --git a/eqn.c b/eqn.c
index 1cc0874a..e36df60a 100644
--- a/eqn.c
+++ b/eqn.c
@@ -1,4 +1,4 @@
-/*	$Id: eqn.c,v 1.53 2014/10/12 20:08:58 schwarze Exp $ */
+/*	$Id: eqn.c,v 1.54 2014/10/16 01:11:20 schwarze Exp $ */
 /*
  * Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -588,6 +588,30 @@ eqn_box_makebinary(struct eqn_node *ep,
 }
 
 /*
+ * Parse the "delim" control statement.
+ */
+static void
+eqn_delim(struct eqn_node *ep)
+{
+	const char	*start;
+	size_t		 sz;
+
+	if ((start = eqn_nextrawtok(ep, &sz)) == NULL)
+		mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse,
+		    ep->eqn.ln, ep->eqn.pos, "delim");
+	else if (strncmp(start, "off", 3) == 0)
+		ep->delim = 0;
+	else if (strncmp(start, "on", 2) == 0) {
+		if (ep->odelim && ep->cdelim)
+			ep->delim = 1;
+	} else if (start[1] != '\0') {
+		ep->odelim = start[0];
+		ep->cdelim = start[1];
+		ep->delim = 1;
+	}
+}
+
+/*
  * Undefine a previously-defined string.
  */
 static int
@@ -698,6 +722,8 @@ this_tok:
 			EQN_MSG(MANDOCERR_EQNEOF, ep);
 		break;
 	case (EQN_TOK_DELIM):
+		eqn_delim(ep);
+		break;
 	case (EQN_TOK_GFONT):
 		if (eqn_nextrawtok(ep, NULL) == NULL)
 			mandoc_msg(MANDOCERR_REQ_EMPTY, ep->parse,