/* $Id$ */
/*
* 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
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#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_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);
}
void
roff_reset(struct roff *r)
{
roff_free1(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));
}
