`ig' support in all its glory. Try

  .ig ig
  asdf
  .ig
  fdsa
  ..

or

  .ig if
  asdf
  .if n \
  foo

for a laugh.  It all works.  Lots of regression tests supporting this
and documentation for the same.

1 files changed, 125 insertions, 22 deletions

diff --git a/roff.c b/roff.c
index 09d3527b..a6544c9f 100644
--- a/roff.c
+++ b/roff.c
@@ -1,4 +1,4 @@
-/*	$Id: roff.c,v 1.77 2010/05/16 19:08:11 kristaps Exp $ */
+/*	$Id: roff.c,v 1.78 2010/05/16 22:28:33 kristaps Exp $ */
 /*
  * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -81,24 +81,21 @@ typedef	enum rofferr (*roffproc)(ROFF_ARGS);
 struct	roffmac {
 	const char	*name; /* macro name */
 	roffproc	 proc;
+	roffproc	 text;
 };
 
 static	enum rofferr	 roff_if(ROFF_ARGS);
+static	enum rofferr	 roff_if_text(ROFF_ARGS);
 static	enum rofferr	 roff_ig(ROFF_ARGS);
+static	enum rofferr	 roff_ig_text(ROFF_ARGS);
 static	enum rofferr	 roff_cblock(ROFF_ARGS);
 static	enum rofferr	 roff_ccond(ROFF_ARGS);
 
 const	struct roffmac	 roffs[ROFF_MAX] = {
-	{ "if", roff_if },
-	{ "ig", roff_ig },
-	{ ".", roff_cblock },
-	{ "\\}", roff_ccond },
-#if 0
-	{ "am", roff_sub_ig, roff_new_ig },
-	{ "ami", roff_sub_ig, roff_new_ig },
-	{ "de", roff_sub_ig, roff_new_ig },
-	{ "dei", roff_sub_ig, roff_new_ig },
-#endif
+	{ "if", roff_if, roff_if_text },
+	{ "ig", roff_ig, roff_ig_text },
+	{ ".", roff_cblock, NULL },
+	{ "\\}", roff_ccond, NULL },
 };
 
 static	void		 roff_free1(struct roff *);
@@ -218,28 +215,72 @@ roff_parseln(struct roff *r, int ln,
 		char **bufp, size_t *szp, int pos, int *offs)
 {
 	enum rofft	 t;
-	int		 ppos;
+	int		 ppos, i, j, wtf;
 
 	if (r->last && ! ROFF_CTL((*bufp)[pos])) {
-		if (ROFF_ig == r->last->tok)
-			return(ROFF_IGN);
-		roffnode_cleanscope(r);
-		/* FIXME: this assumes we're discarding! */
-		return(ROFF_IGN);
+		/*
+		 * If a scope is open and we're not a macro, pass it
+		 * through our text detector and continue as quickly as
+		 * possible.
+		 */
+		t = r->last->tok;
+		assert(roffs[t].text);
+		return((*roffs[t].text)
+				(r, t, bufp, szp, ln, pos, pos, offs));
 	} else if ( ! ROFF_CTL((*bufp)[pos]))
+		/*
+		 * Don't do anything if we're free-form text.
+		 */
 		return(ROFF_CONT);
 
-	/* There's nothing on the stack: make us anew. */
+	/* A macro-ish line with a possibly-open macro context. */
+
+	wtf = 0;
+
+	if (r->last && r->last->end) {
+		/*
+		 * We have a scope open that has a custom end-macro
+		 * handler.  Try to match it against the input.
+		 */
+		i = pos + 1;
+		while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
+			i++;
+
+		for (j = 0; r->last->end[j]; j++, i++)
+			if ((*bufp)[i] != r->last->end[j])
+				break;
+
+		if ('\0' == r->last->end[j] && 
+				('\0' == (*bufp)[i] ||
+				 ' ' == (*bufp)[i] ||
+				 '\t' == (*bufp)[i])) {
+			roffnode_pop(r);
+			roffnode_cleanscope(r);
+			wtf = 1;
+		}
+	}
 
 	ppos = pos;
 	if (ROFF_MAX == (t = roff_parse(*bufp, &pos))) {
-		if (r->last && ROFF_ig == r->last->tok)
+		/* 
+		 * This is some of groff's stranger behaviours.  If we
+		 * encountered a custom end-scope tag and that tag also
+		 * happens to be a "real" macro, then we need to try
+		 * interpreting it again as a real macro.  If it's not,
+		 * then return ignore.  Else continue.
+		 */
+		if (wtf)
 			return(ROFF_IGN);
-		return(ROFF_CONT);
+		else if (NULL == r->last)
+			return(ROFF_CONT);
+
+		/* FIXME: this assumes that we ignore!? */
+		return(ROFF_IGN);
 	}
 
 	assert(roffs[t].proc);
-	return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
+	return((*roffs[t].proc)
+			(r, t, bufp, szp, ln, ppos, pos, offs));
 }
 
 
@@ -375,11 +416,42 @@ roff_ccond(ROFF_ARGS)
 static enum rofferr
 roff_ig(ROFF_ARGS)
 {
+	int		sv;
+	size_t		sz;
 
 	if ( ! roffnode_push(r, tok, ln, ppos))
 		return(ROFF_ERR);
 
-	ROFF_MDEBUG(r, "opening ignore block");
+	if ('\0' == (*bufp)[pos]) {
+		ROFF_MDEBUG(r, "opening ignore block");
+		return(ROFF_IGN);
+	}
+
+	sv = pos;
+	while ((*bufp)[pos] && ' ' != (*bufp)[pos] && 
+			'\t' != (*bufp)[pos])
+		pos++;
+
+	/*
+	 * Note: groff does NOT like escape characters in the input.
+	 * Instead of detecting this, we're just going to let it fly and
+	 * to hell with it.
+	 */
+
+	assert(pos > sv);
+	sz = (size_t)(pos - sv);
+
+	r->last->end = malloc(sz + 1);
+
+	if (NULL == r->last->end) {
+		(*r->msg)(MANDOCERR_MEM, r->data, ln, pos, NULL);
+		return(ROFF_ERR);
+	}
+
+	memcpy(r->last->end, *bufp + sv, sz);
+	r->last->end[(int)sz] = '\0';
+
+	ROFF_MDEBUG(r, "opening explicit ignore block");
 
 	if ((*bufp)[pos])
 		if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
@@ -391,6 +463,37 @@ roff_ig(ROFF_ARGS)
 
 /* ARGSUSED */
 static enum rofferr
+roff_ig_text(ROFF_ARGS)
+{
+
+	return(ROFF_IGN);
+}
+
+
+/* ARGSUSED */
+static enum rofferr
+roff_if_text(ROFF_ARGS)
+{
+	char		*ep, *st;
+
+	st = &(*bufp)[pos];
+	if (NULL == (ep = strstr(st, "\\}"))) {
+		roffnode_cleanscope(r);
+		return(ROFF_IGN);
+	}
+
+	if (ep > st && '\\' != *(ep - 1)) {
+		ROFF_MDEBUG(r, "closing explicit scope (in-line)");
+		roffnode_pop(r);
+	}
+
+	roffnode_cleanscope(r);
+	return(ROFF_IGN);
+}
+
+
+/* ARGSUSED */
+static enum rofferr
 roff_if(ROFF_ARGS)
 {
 	int		 sv;