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/* $Id: tag.c,v 1.30 2020/03/21 00:17:31 schwarze Exp $ */
/*
* Copyright (c) 2015,2016,2018,2019,2020 Ingo Schwarze <schwarze@openbsd.org>
*
* 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.
*
* Functions to tag syntax tree nodes.
* For internal use by mandoc(1) validation modules only.
*/
#include "config.h"
#include <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "mandoc_aux.h"
#include "mandoc_ohash.h"
#include "roff.h"
#include "tag.h"
struct tag_entry {
struct roff_node **nodes;
size_t maxnodes;
size_t nnodes;
int prio;
char s[];
};
static struct ohash tag_data;
/*
* Set up the ohash table to collect nodes
* where various marked-up terms are documented.
*/
void
tag_alloc(void)
{
mandoc_ohash_init(&tag_data, 4, offsetof(struct tag_entry, s));
}
void
tag_free(void)
{
struct tag_entry *entry;
unsigned int slot;
if (tag_data.info.free == NULL)
return;
entry = ohash_first(&tag_data, &slot);
while (entry != NULL) {
free(entry->nodes);
free(entry);
entry = ohash_next(&tag_data, &slot);
}
ohash_delete(&tag_data);
tag_data.info.free = NULL;
}
/*
* Set a node where a term is defined,
* unless it is already defined at a lower priority.
*/
void
tag_put(const char *s, int prio, struct roff_node *n)
{
struct tag_entry *entry;
const char *se;
size_t len;
unsigned int slot;
assert(prio <= TAG_FALLBACK);
if (s == NULL) {
if (n->child == NULL || n->child->type != ROFFT_TEXT)
return;
s = n->child->string;
switch (s[0]) {
case '-':
s++;
break;
case '\\':
switch (s[1]) {
case '&':
case '-':
case 'e':
s += 2;
break;
default:
break;
}
break;
default:
break;
}
}
/*
* Skip whitespace and escapes and whatever follows,
* and if there is any, downgrade the priority.
*/
len = strcspn(s, " \t\\");
if (len == 0)
return;
se = s + len;
if (*se != '\0' && prio < TAG_WEAK)
prio = TAG_WEAK;
slot = ohash_qlookupi(&tag_data, s, &se);
entry = ohash_find(&tag_data, slot);
/* Build a new entry. */
if (entry == NULL) {
entry = mandoc_malloc(sizeof(*entry) + len + 1);
memcpy(entry->s, s, len);
entry->s[len] = '\0';
entry->nodes = NULL;
entry->maxnodes = entry->nnodes = 0;
ohash_insert(&tag_data, slot, entry);
}
/*
* Lower priority numbers take precedence.
* If a better entry is already present, ignore the new one.
*/
else if (entry->prio < prio)
return;
/*
* If the existing entry is worse, clear it.
* In addition, a tag with priority TAG_FALLBACK
* is only used if the tag occurs exactly once.
*/
else if (entry->prio > prio || prio == TAG_FALLBACK) {
while (entry->nnodes > 0)
entry->nodes[--entry->nnodes]->flags &= ~NODE_ID;
if (prio == TAG_FALLBACK) {
entry->prio = TAG_DELETE;
return;
}
}
/* Remember the new node. */
if (entry->maxnodes == entry->nnodes) {
entry->maxnodes += 4;
entry->nodes = mandoc_reallocarray(entry->nodes,
entry->maxnodes, sizeof(*entry->nodes));
}
entry->nodes[entry->nnodes++] = n;
entry->prio = prio;
n->flags |= NODE_ID;
if (n->child == NULL || n->child->string != s || *se != '\0') {
assert(n->string == NULL);
n->string = mandoc_strndup(s, len);
}
}
enum tag_result
tag_check(const char *test_tag)
{
unsigned int slot;
if (ohash_first(&tag_data, &slot) == NULL)
return TAG_EMPTY;
else if (test_tag != NULL && ohash_find(&tag_data,
ohash_qlookup(&tag_data, test_tag)) == NULL)
return TAG_MISS;
else
return TAG_OK;
}
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