Add mandoc.h, which will eventually replace compilers' inner enum errors with unified ones.

Add initial roff pre-processor shim, a compiler sitting outside of the other compilers that processes pure roff instructions.

1 files changed, 305 insertions, 1 deletions

diff --git a/roff.c b/roff.c
index 0c663270..e79de28d 100644
--- a/roff.c
+++ b/roff.c
@@ -1,6 +1,6 @@
 /*	$Id$ */
 /*
- * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -18,7 +18,311 @@
 #include "config.h"
 #endif
 
+#include <assert.h>
 #include <stdlib.h>
+#include <string.h>
 
+#include "mandoc.h"
 #include "roff.h"
 
+enum	rofft {
+	ROFF_de,
+	ROFF_dei,
+	ROFF_am,
+	ROFF_ami,
+	ROFF_ig,
+	ROFF_close,
+	ROFF_MAX
+};
+
+struct	roff {
+	struct roffnode	*last; /* leaf of stack */
+	mandocmsg	 msg; /* err/warn/fatal messages */
+	void		*data; /* privdata for messages */
+};
+
+struct	roffnode {
+	enum rofft	 tok; /* type of node */
+	struct roffnode	*parent; /* up one in stack */
+	int		 line; /* parse line */
+	int		 col; /* parse col */
+};
+
+#define	ROFF_ARGS	 struct roff *r, /* parse ctx */ \
+		 	 char **bufp, /* input buffer */ \
+			 size_t *szp, /* size of input buffer */ \
+			 int ln, /* parse line */ \
+			 int ppos /* current pos in buffer */
+
+typedef	enum rofferr (*roffproc)(ROFF_ARGS);
+
+struct	roffmac {
+	const char	*name; /* macro name */
+	roffproc	 sub; /* child of control black */
+	roffproc	 new; /* root of stack (type = ROFF_MAX) */
+};
+
+static	enum rofferr	 roff_ignore(ROFF_ARGS);
+static	enum rofferr	 roff_new_close(ROFF_ARGS);
+static	enum rofferr	 roff_new_ig(ROFF_ARGS);
+static	enum rofferr	 roff_sub_ig(ROFF_ARGS);
+
+const	struct roffmac	 roffs[ROFF_MAX] = {
+	{ "de", NULL, roff_ignore },
+	{ "dei", NULL, roff_ignore },
+	{ "am", NULL, roff_ignore },
+	{ "ami", NULL, roff_ignore },
+	{ "ig", roff_sub_ig, roff_new_ig },
+	{ ".", NULL, roff_new_close },
+};
+
+static	void		 roff_alloc1(struct roff *);
+static	void		 roff_free1(struct roff *);
+static	enum rofft	 roff_hash_find(const char *);
+static	int		 roffnode_push(struct roff *, 
+				enum rofft, int, int);
+static	void		 roffnode_pop(struct roff *);
+static	enum rofft	 roff_parse(const char *, int *);
+
+
+/*
+ * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
+ * the nil-terminated string name could be found.
+ */
+static enum rofft
+roff_hash_find(const char *p)
+{
+	int		 i;
+
+	/* FIXME: make this be fast and efficient. */
+
+	for (i = 0; i < (int)ROFF_MAX; i++)
+		if (0 == strcmp(roffs[i].name, p))
+			return((enum rofft)i);
+
+	return(ROFF_MAX);
+}
+
+
+/*
+ * Pop the current node off of the stack of roff instructions currently
+ * pending.
+ */
+static void
+roffnode_pop(struct roff *r)
+{
+	struct roffnode	*p;
+
+	if (NULL == (p = r->last))
+		return;
+	r->last = p->parent;
+	free(p);
+}
+
+
+/*
+ * Push a roff node onto the instruction stack.  This must later be
+ * removed with roffnode_pop().
+ */
+static int
+roffnode_push(struct roff *r, enum rofft tok, int line, int col)
+{
+	struct roffnode	*p;
+
+	if (NULL == (p = calloc(1, sizeof(struct roffnode)))) {
+		(*r->msg)(MANDOCERR_MEM, r->data, line, col, NULL);
+		return(0);
+	}
+
+	p->tok = tok;
+	p->parent = r->last;
+	p->line = line;
+	p->col = col;
+
+	r->last = p;
+	return(1);
+}
+
+
+static void
+roff_free1(struct roff *r)
+{
+
+	while (r->last)
+		roffnode_pop(r);
+}
+
+
+static void
+roff_alloc1(struct roff *r)
+{
+
+	memset(r, 0, sizeof(struct roff));
+}
+
+
+void
+roff_reset(struct roff *r)
+{
+
+	roff_free1(r);
+	roff_alloc1(r);
+}
+
+
+void
+roff_free(struct roff *r)
+{
+
+	roff_free1(r);
+	free(r);
+}
+
+
+struct roff *
+roff_alloc(const mandocmsg msg, void *data)
+{
+	struct roff	*r;
+
+	if (NULL == (r = calloc(1, sizeof(struct roff)))) {
+		(*msg)(MANDOCERR_MEM, data, 0, 0, NULL);
+		return(0);
+	}
+
+	r->msg = msg;
+	r->data = data;
+	return(r);
+}
+
+
+enum rofferr
+roff_parseln(struct roff *r, int ln, char **bufp, size_t *szp)
+{
+	enum rofft	 t;
+	int		 ppos;
+
+	if (NULL != r->last) {
+		/*
+		 * If there's a node on the stack, then jump directly
+		 * into its processing function.
+		 */
+		t = r->last->tok;
+		assert(roffs[t].sub);
+		return((*roffs[t].sub)(r, bufp, szp, ln, 0));
+	} else if ('.' != (*bufp)[0] && NULL == r->last)
+		/* Return when in free text without a context. */
+		return(ROFF_CONT);
+
+	/* There's nothing on the stack: make us anew. */
+
+	if (ROFF_MAX == (t = roff_parse(*bufp, &ppos)))
+		return(ROFF_CONT);
+
+	assert(roffs[t].new);
+	return((*roffs[t].new)(r, bufp, szp, ln, ppos));
+}
+
+
+/*
+ * Parse a roff node's type from the input buffer.  This must be in the
+ * form of ".foo xxx" in the usual way.
+ */
+static enum rofft
+roff_parse(const char *buf, int *pos)
+{
+	int		 j;
+	char		 mac[5];
+	enum rofft	 t;
+
+	assert('.' == buf[0]);
+	*pos = 1;
+
+	while (buf[*pos] && (' ' == buf[*pos] || '\t' == buf[*pos]))
+		(*pos)++;
+
+	if ('\0' == buf[*pos])
+		return(ROFF_MAX);
+
+	for (j = 0; j < 4; j++, (*pos)++)
+		if ('\0' == (mac[j] = buf[*pos]))
+			break;
+		else if (' ' == buf[*pos])
+			break;
+
+	if (j == 4 || j < 1)
+		return(ROFF_MAX);
+
+	mac[j] = '\0';
+
+	if (ROFF_MAX == (t = roff_hash_find(mac)))
+		return(t);
+
+	while (buf[*pos] && ' ' == buf[*pos])
+		(*pos)++;
+
+	return(t);
+}
+
+
+/* ARGSUSED */
+static enum rofferr
+roff_ignore(ROFF_ARGS)
+{
+
+	return(ROFF_IGN);
+}
+
+
+/* ARGSUSED */
+static enum rofferr
+roff_sub_ig(ROFF_ARGS)
+{
+	enum rofft	 t;
+	int		 pos;
+
+	/* Ignore free-text lines. */
+
+	if ('.' != (*bufp)[ppos])
+		return(ROFF_IGN);
+
+	/* Ignore macros unless it's a closing macro. */
+
+	t = roff_parse(*bufp, &pos);
+	if (ROFF_close != t)
+		return(ROFF_IGN);
+
+	roffnode_pop(r);
+	return(ROFF_IGN);
+}
+
+
+/* ARGSUSED */
+static enum rofferr
+roff_new_close(ROFF_ARGS)
+{
+
+	if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
+		return(ROFF_ERR);
+	return(ROFF_IGN);
+}
+
+
+/* ARGSUSED */
+static enum rofferr
+roff_new_ig(ROFF_ARGS)
+{
+
+	return(roffnode_push(r, ROFF_ig, ln, ppos) ? 
+			ROFF_IGN : ROFF_ERR);
+}
+
+
+int
+roff_endparse(struct roff *r)
+{
+
+	if (NULL == r->last)
+		return(1);
+	return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, 
+				r->last->line, r->last->col, NULL));
+}