The circumflex is also a special space character.

Note this and clean up some documentation in eqn.7.
Also add some version notes, although I'm not ready for a release yet.

3 files changed, 37 insertions, 24 deletions

diff --git a/eqn.7 b/eqn.7
index 71045263..05656558 100644
--- a/eqn.7
+++ b/eqn.7
@@ -64,35 +64,35 @@ case-sensitive literals in the input:
 .Bd -literal -offset indent
 eqn     : box | eqn box
 box     : text
-        | "{" eqn "}"
-        | "define" text text
-        | "gfont" text
-        | "gsize" text
-        | "set" text text
-        | "undef" text
+        | \*q{\*q eqn \*q}\*q
+        | \*qdefine\*q text text
+        | \*qgfont\*q text
+        | \*qgsize\*q text
+        | \*qset\*q text text
+        | \*qundef\*q text
         | box pos box
         | box mark
-        | pile "{" list "}"
+        | pile \*q{\*q list \*q}\*q
         | font box
-        | "size" text box
-        | "left" text eqn ["right" text]
-text    : TEXT
-pile    : "lpile" | "cpile" | "rpile"
-pos     : "over" | "sup" | "sub" | "to" | "from"
-mark	: "dot" | "dotdot" | "hat" | "tilde" | "vec"
-        | "dyad" | "bar" | "under"
-font    : "roman" | "italic" | "bold"
-list    : eqn 
-        | list "above" eqn
+        | \*qsize\*q text box
+        | \*qleft\*q text eqn [\*qright\*q text]
+text    : [^space\e\*q]+ | \e\*q.*\e\*q
+pile    : \*qlpile\*q | \*qcpile\*q | \*qrpile\*q
+pos     : \*qover\*q | \*qsup\*q | \*qsub\*q | \*qto\*q | \*qfrom\*q
+mark	: \*qdot\*q | \*qdotdot\*q | \*qhat\*q | \*qtilde\*q | \*qvec\*q
+        | \*qdyad\*q | \*qbar\*q | \*qunder\*q
+font    : \*qroman\*q | \*qitalic\*q | \*\*qbold\*q
+list    : eqn
+        | list \*qabove\*q eqn
+space   : [\e^~ \et]
 .Ed
 .Pp
-Data in TEXT form is a non-empty sequence of non-space characters or a
-non-empty quoted string.
-Unless within a quoted string, white-space (and enclosing literal quote
-pairs) is thrown away.
-Quoted strings are not scanned for replacement definitions.
+White-space consists of the space, tab, circumflex, and tilde
+characters.
+If within a quoted string, these space characters are retained.
+Quoted strings are also not scanned for replacement definitions.
 .Pp
-The following TEXT terms are translated into a rendered glyph, if
+The following text terms are translated into a rendered glyph, if
 available: alpha, beta, chi, delta, epsilon, eta, gamma, iota, kappa,
 lambda, mu, nu, omega, omicron, phi, pi, psi, rho, sigma, tau, theta,
 upsilon, xi, zeta, DELTA, GAMMA, LAMBDA, OMEGA, PHI, PI, PSI, SIGMA,
@@ -197,6 +197,10 @@ The text string
 .Sq \e\*q
 is interpreted as a literal quote in troff.
 In mandoc, this is interpreted as a comment.
+.It
+In troff, The circumflex and tilde white-space symbols map to
+fixed-width spaces.
+In mandoc, these characters are synonyms for the space character.
 .El
 .Sh SEE ALSO
 .Xr mandoc 1 ,
diff --git a/eqn.c b/eqn.c
index 1fb8d81f..1f82c556 100644
--- a/eqn.c
+++ b/eqn.c
@@ -648,7 +648,7 @@ again:
 		if ('{' == *start || '}' == *start)
 			ssz = 1;
 		else
-			ssz = strcspn(start + 1, " ~\"{}\t") + 1;
+			ssz = strcspn(start + 1, " ^~\"{}\t") + 1;
 		next = start + (int)ssz;
 		if ('\0' == *next)
 			next = NULL;
@@ -662,6 +662,7 @@ again:
 			ep->cur++;
 		while (' ' == ep->data[(int)ep->cur] ||
 				'\t' == ep->data[(int)ep->cur] ||
+				'^' == ep->data[(int)ep->cur] ||
 				'~' == ep->data[(int)ep->cur])
 			ep->cur++;
 	} else {
diff --git a/index.sgml b/index.sgml
index 2f4e352c..60386bcb 100644
--- a/index.sgml
+++ b/index.sgml
@@ -311,6 +311,14 @@
 			<A NAME="news">News</A>
 		</H1>
 		<P CLASS="news">
+			xx-07-2011: version 1.11.5
+		</P>
+		<P>
+			Significant <A HREF="eqn.7.html">eqn</A> improvements.  <SPAN CLASS="nm">mdocml</SPAN> can now parse arbitrary equations
+			(although few GNU troff extensions are accepted, nor is mixing low-level roff with eqn).  See the <A
+			HREF="eqn.7.html">eqn</A> manual for details.  For the time being, equations are rendered as simple in-line text.
+		</P>
+		<P CLASS="news">
 			12-07-2011: version 1.11.4
 		</P>
 		<P>