/* $Id$ */
/*
* Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
*
* 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.
*/
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "libman.h"
#define REW_REWIND (0) /* See rew_scope(). */
#define REW_NOHALT (1) /* See rew_scope(). */
#define REW_HALT (2) /* See rew_scope(). */
static int in_line_eoln(MACRO_PROT_ARGS);
static int blk_imp(MACRO_PROT_ARGS);
static int blk_close(MACRO_PROT_ARGS);
static int rew_scope(enum man_type, struct man *, int);
static int rew_dohalt(int, enum man_type,
const struct man_node *);
static int rew_block(int, enum man_type,
const struct man_node *);
const struct man_macro __man_macros[MAN_MAX] = {
{ in_line_eoln, 0 }, /* br */
{ in_line_eoln, 0 }, /* TH */
{ blk_imp, 0 }, /* SH */
{ blk_imp, 0 }, /* SS */
{ blk_imp, MAN_SCOPED }, /* TP */
{ blk_imp, 0 }, /* LP */
{ blk_imp, 0 }, /* PP */
{ blk_imp, 0 }, /* P */
{ blk_imp, 0 }, /* IP */
{ blk_imp, 0 }, /* HP */
{ in_line_eoln, MAN_SCOPED }, /* SM */
{ in_line_eoln, MAN_SCOPED }, /* SB */
{ in_line_eoln, 0 }, /* BI */
{ in_line_eoln, 0 }, /* IB */
{ in_line_eoln, 0 }, /* BR */
{ in_line_eoln, 0 }, /* RB */
{ in_line_eoln, MAN_SCOPED }, /* R */
{ in_line_eoln, MAN_SCOPED }, /* B */
{ in_line_eoln, MAN_SCOPED }, /* I */
{ in_line_eoln, 0 }, /* IR */
{ in_line_eoln, 0 }, /* RI */
{ in_line_eoln, 0 }, /* na */
{ in_line_eoln, 0 }, /* i */
{ in_line_eoln, 0 }, /* sp */
{ in_line_eoln, 0 }, /* nf */
{ in_line_eoln, 0 }, /* fi */
{ in_line_eoln, 0 }, /* r */
{ blk_close, 0 }, /* RE */
{ blk_imp, MAN_EXPLICIT }, /* RS */
{ in_line_eoln, 0 }, /* DT */
};
const struct man_macro * const man_macros = __man_macros;
int
man_unscope(struct man *m, const struct man_node *n)
{
assert(n);
m->next = MAN_NEXT_SIBLING;
/* LINTED */
while (m->last != n) {
if ( ! man_valid_post(m))
return(0);
if ( ! man_action_post(m))
return(0);
m->last = m->last->parent;
assert(m->last);
}
if ( ! man_valid_post(m))
return(0);
return(man_action_post(m));
}
static int
rew_block(int ntok, enum man_type type, const struct man_node *n)
{
if (MAN_BLOCK == type && ntok == n->parent->tok &&
MAN_BODY == n->parent->type)
return(REW_REWIND);
return(ntok == n->tok ? REW_HALT : REW_NOHALT);
}
/*
* There are three scope levels: scoped to the root (all), scoped to the
* section (all less sections), and scoped to subsections (all less
* sections and subsections).
*/
static int
rew_dohalt(int tok, enum man_type type, const struct man_node *n)
{
int c;
if (MAN_ROOT == n->type)
return(REW_HALT);
assert(n->parent);
if (MAN_ROOT == n->parent->type)
return(REW_REWIND);
if (MAN_VALID & n->flags)
return(REW_NOHALT);
/* Rewind to ourselves, first. */
if (type == n->type && tok == n->tok)
return(REW_REWIND);
switch (tok) {
case (MAN_SH):
break;
case (MAN_SS):
/* Rewind to a section, if a block. */
if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
return(c);
break;
case (MAN_RS):
/* Rewind to a subsection, if a block. */
if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
return(c);
/* Rewind to a section, if a block. */
if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
return(c);
break;
default:
/* Rewind to an offsetter, if a block. */
if (REW_NOHALT != (c = rew_block(MAN_RS, type, n)))
return(c);
/* Rewind to a subsection, if a block. */
if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
return(c);
/* Rewind to a section, if a block. */
if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
return(c);
break;
}
return(REW_NOHALT);
}
/*
* Rewinding entails ascending the parse tree until a coherent point,
* for example, the `SH' macro will close out any intervening `SS'
* scopes. When a scope is closed, it must be validated and actioned.
*/
static int
rew_scope(enum man_type type, struct man *m, int tok)
{
struct man_node *n;
int c;
/* LINTED */
for (n = m->last; n; n = n->parent) {
/*
* Whether we should stop immediately (REW_HALT), stop
* and rewind until this point (REW_REWIND), or keep
* rewinding (REW_NOHALT).
*/
c = rew_dohalt(tok, type, n);
if (REW_HALT == c)
return(1);
if (REW_REWIND == c)
break;
}
/* Rewind until the current point. */
assert(n);
return(man_unscope(m, n));
}
/* ARGSUSED */
int
blk_close(MACRO_PROT_ARGS)
{
int ntok;
const struct man_node *nn;
switch (tok) {
case (MAN_RE):
ntok = MAN_RS;
break;
default:
abort();
/* NOTREACHED */
}
for (nn = m->last->parent; nn; nn = nn->parent)
if (ntok == nn->tok)
break;
if (NULL == nn)
if ( ! man_pwarn(m, line, ppos, WNOSCOPE))
return(0);
if ( ! rew_scope(MAN_BODY, m, ntok))
return(0);
if ( ! rew_scope(MAN_BLOCK, m, ntok))
return(0);
m->next = MAN_NEXT_SIBLING;
return(1);
}
/*
* Parse an implicit-block macro. These contain a MAN_HEAD and a
* MAN_BODY contained within a MAN_BLOCK. Rules for closing out other
* scopes, such as `SH' closing out an `SS', are defined in the rew
* routines.
*/
int
blk_imp(MACRO_PROT_ARGS)
{
int w, la;
char *p;
/* Close out prior scopes. */
if ( ! rew_scope(MAN_BODY, m, tok))
return(0);
if ( ! rew_scope(MAN_BLOCK, m, tok))
return(0);
/* Allocate new block & head scope. */
if ( ! man_block_alloc(m, line, ppos, tok))
return(0);
if ( ! man_head_alloc(m, line, ppos, tok))
return(0);
/* Add line arguments. */
for (;;) {
la = *pos;
w = man_args(m, line, pos, buf, &p);
if (-1 == w)
return(0);
if (0 == w)
break;
if ( ! man_word_alloc(m, line, la, p))
return(0);
}
/* Close out head and open body (unless MAN_SCOPE). */
if (MAN_SCOPED & man_macros[tok].flags) {
m->flags |= MAN_BLINE;
return(1);
} else if ( ! rew_scope(MAN_HEAD, m, tok))
return(0);
return(man_body_alloc(m, line, ppos, tok));
}
int
in_line_eoln(MACRO_PROT_ARGS)
{
int w, la;
char *p;
struct man_node *n;
if ( ! man_elem_alloc(m, line, ppos, tok))
return(0);
n = m->last;
for (;;) {
la = *pos;
w = man_args(m, line, pos, buf, &p);
if (-1 == w)
return(0);
if (0 == w)
break;
if ( ! man_word_alloc(m, line, la, p))
return(0);
}
if (n == m->last && (MAN_SCOPED & man_macros[tok].flags)) {
m->flags |= MAN_ELINE;
return(1);
}
/*
* Note that when TH is pruned, we'll be back at the root, so
* make sure that we don't clobber as its sibling.
*/
for ( ; m->last; m->last = m->last->parent) {
if (m->last == n)
break;
if (m->last->type == MAN_ROOT)
break;
if ( ! man_valid_post(m))
return(0);
if ( ! man_action_post(m))
return(0);
}
assert(m->last);
/*
* Same here regarding whether we're back at the root.
*/
if (m->last->type != MAN_ROOT && ! man_valid_post(m))
return(0);
if (m->last->type != MAN_ROOT && ! man_action_post(m))
return(0);
if (m->last->type != MAN_ROOT)
m->next = MAN_NEXT_SIBLING;
return(1);
}
int
man_macroend(struct man *m)
{
struct man_node *n;
n = MAN_VALID & m->last->flags ?
m->last->parent : m->last;
for ( ; n; n = n->parent) {
if (MAN_BLOCK != n->type)
continue;
if ( ! (MAN_EXPLICIT & man_macros[n->tok].flags))
continue;
return(man_nerr(m, n, WEXITSCOPE));
}
return(man_unscope(m, m->first));
}
