mirror of
https://github.com/rkd77/elinks.git
synced 2024-09-06 23:44:43 -04:00
591 lines
13 KiB
C
591 lines
13 KiB
C
/* The DOM node handling */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "elinks.h"
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#include "dom/node.h"
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#include "dom/string.h"
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#include "util/hash.h"
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#include "util/memory.h"
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static void done_dom_node_data(struct dom_node *node);
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/* Node lists */
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#define DOM_NODE_LIST_GRANULARITY 0x7
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#define DOM_NODE_LIST_BLOCK_SIZE \
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(ALIGN_MEMORY_SIZE(1, DOM_NODE_LIST_GRANULARITY) * sizeof(struct dom_node *))
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/* The node list struct has one node pointer */
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#define DOM_NODE_LIST_SIZE(size) \
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((size - 1) * sizeof(struct dom_node *) + sizeof(struct dom_node_list))
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static inline struct dom_node_list *
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realloc_dom_node_list(struct dom_node_list **oldlist)
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{
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struct dom_node_list *list = *oldlist;
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size_t size = list ? list->size : 0;
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size_t oldsize = ALIGN_MEMORY_SIZE(size, DOM_NODE_LIST_GRANULARITY);
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size_t newsize = ALIGN_MEMORY_SIZE(size + 1, DOM_NODE_LIST_GRANULARITY);
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if (newsize <= oldsize) return list;
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list = (struct dom_node_list *)mem_realloc(list, DOM_NODE_LIST_SIZE(newsize));
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if (!list) return NULL;
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/* If this is the first reallocation clear the size */
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if (!size) list->size = 0;
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/* Clear the new block of entries */
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memset(&list->entries[oldsize], 0, DOM_NODE_LIST_BLOCK_SIZE);
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*oldlist = list;
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return list;
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}
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struct dom_node_list *
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add_to_dom_node_list(struct dom_node_list **list_ptr,
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struct dom_node *node, int position)
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{
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struct dom_node_list *list;
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assert(list_ptr && node);
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list = realloc_dom_node_list(list_ptr);
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if (!list) return NULL;
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assertm(position < 0 || position <= list->size,
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"position out of bound %d > %zu", position, list->size);
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if (position < 0) {
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position = list->size;
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} else if (position < list->size) {
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/* Make room if we have to add the node in the middle of the list */
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struct dom_node **offset = &list->entries[position];
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size_t size = (list->size - position) * sizeof(*offset);
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memmove(offset + 1, offset, size);
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}
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list->size++;
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list->entries[position] = node;
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return list;
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}
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static void
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del_from_dom_node_list(struct dom_node_list *list, struct dom_node *node)
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{
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struct dom_node *entry;
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size_t i;
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if (!list) return;
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foreach_dom_node (list, entry, i) {
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size_t successors;
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if (entry != node) continue;
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successors = list->size - (i + 1);
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if (successors)
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memmove(&list->entries[i], &list->entries[i+1],
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sizeof(*list->entries) * successors);
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list->size--;
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}
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}
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void
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done_dom_node_list(struct dom_node_list *list)
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{
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struct dom_node *node;
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int i;
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assert(list);
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foreach_dom_node (list, node, i) {
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/* Avoid that the node start messing with the node list. */
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done_dom_node_data(node);
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}
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mem_free(list);
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}
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/* Node map */
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struct dom_node_search {
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struct dom_node *key;
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int from, pos, to;
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};
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#define INIT_DOM_NODE_SEARCH(key, list) \
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{ (key), -1, 0, (int)(list)->size, }
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int
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dom_node_casecmp(struct dom_node *node1, struct dom_node *node2)
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{
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if (node1->type == node2->type) {
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switch (node1->type) {
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case DOM_NODE_ELEMENT:
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if (node1->data.element.type && node2->data.element.type)
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return node1->data.element.type - node2->data.element.type;
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break;
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case DOM_NODE_ATTRIBUTE:
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if (node1->data.attribute.type && node2->data.attribute.type)
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return node1->data.attribute.type - node2->data.attribute.type;
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break;
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default:
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break;
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}
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}
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return dom_string_casecmp(&node1->string, &node2->string);
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}
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static inline int
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get_bsearch_position(struct dom_node_list *list, int from, int to)
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{
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int pos = from + ((to - from) / 2);
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assertm(0 <= pos && pos < list->size, "pos %d", pos);
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return pos;
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}
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#define has_bsearch_node(from, to) ((from) + 1 < (to))
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static inline struct dom_node *
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dom_node_list_bsearch(struct dom_node_search *search, struct dom_node_list *list)
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{
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assert(has_bsearch_node(search->from, search->to));
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do {
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int pos = get_bsearch_position(list, search->from, search->to);
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struct dom_node *node = list->entries[pos];
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int difference = dom_node_casecmp(search->key, node);
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search->pos = pos;
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if (!difference) return node;
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if (difference < 0) {
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search->to = search->pos;
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} else {
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search->from = search->pos;
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}
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} while (has_bsearch_node(search->from, search->to));
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return NULL;
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}
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int
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get_dom_node_map_index(struct dom_node_list *list, struct dom_node *node)
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{
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struct dom_node_search search = INIT_DOM_NODE_SEARCH(node, list);
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struct dom_node *match = dom_node_list_bsearch(&search, list);
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return match ? search.pos : search.to;
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}
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struct dom_node *
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get_dom_node_map_entry(struct dom_node_list *list, /*enum dom_node_type*/ uint16_t type,
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uint16_t subtype, struct dom_string *name)
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{
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struct dom_node node = { type, 0, INIT_DOM_STRING(name->string, name->length) };
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struct dom_node_search search = INIT_DOM_NODE_SEARCH(&node, list);
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if (subtype) {
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/* Set the subtype */
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switch (type) {
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case DOM_NODE_ELEMENT:
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node.data.element.type = subtype;
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break;
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case DOM_NODE_ATTRIBUTE:
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node.data.attribute.type = subtype;
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break;
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case DOM_NODE_PROCESSING_INSTRUCTION:
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node.data.proc_instruction.type = subtype;
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break;
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default:
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break;
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}
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}
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return dom_node_list_bsearch(&search, list);
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}
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static int
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get_dom_node_list_pos(struct dom_node_list *list, struct dom_node *node)
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{
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struct dom_node *entry;
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int i;
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assert(list);
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if_assert_failed return -1;
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foreach_dom_node (list, entry, i) {
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if (entry == node)
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return i;
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}
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return -1;
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}
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int
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get_dom_node_list_index(struct dom_node *parent, struct dom_node *node)
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{
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struct dom_node_list **list = get_dom_node_list(parent, node);
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return (list && *list) ? get_dom_node_list_pos(*list, node) : -1;
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}
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struct dom_node *
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get_dom_node_prev(struct dom_node *node)
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{
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struct dom_node_list **list;
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int index;
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assert(node->parent);
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if_assert_failed return NULL;
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list = get_dom_node_list(node->parent, node);
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/* node->parent != NULL, so the node must be in the
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* appropriate list of the parent; the list thus cannot be
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* empty. */
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if (!list) return NULL;
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assert(*list);
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if_assert_failed return NULL;
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index = get_dom_node_list_pos(*list, node);
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assert(index >= 0); /* in particular, not -1 */
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if_assert_failed return NULL;
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if (index > 0)
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return (*list)->entries[index - 1];
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return NULL;
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}
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struct dom_node *
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get_dom_node_next(struct dom_node *node)
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{
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struct dom_node_list **list;
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int index;
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assert(node->parent);
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if_assert_failed return NULL;
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list = get_dom_node_list(node->parent, node);
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/* node->parent != NULL, so the node must be in the
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* appropriate list of the parent; the list thus cannot be
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* empty. */
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if (!list) return NULL;
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assert(*list);
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if_assert_failed return NULL;
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index = get_dom_node_list_pos(*list, node);
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assert(index >= 0); /* in particular, not -1 */
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if_assert_failed return NULL;
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if (index + 1 < (*list)->size)
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return (*list)->entries[index + 1];
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return NULL;
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}
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struct dom_node *
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get_dom_node_child(struct dom_node *parent, /*enum dom_node_type*/ uint16_t type,
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int16_t subtype)
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{
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struct dom_node_list **list;
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struct dom_node *node;
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int index;
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list = get_dom_node_list_by_type(parent, type);
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if (!list) return NULL; /* parent doesn't support this type */
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if (!*list) return NULL; /* list is empty and not yet allocated */
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foreach_dom_node (*list, node, index) {
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if (node->type != type)
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continue;
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if (!subtype) return node;
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switch (type) {
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case DOM_NODE_ELEMENT:
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if (node->data.element.type == subtype)
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return node;
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break;
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case DOM_NODE_ATTRIBUTE:
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if (node->data.attribute.type == subtype)
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return node;
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break;
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case DOM_NODE_PROCESSING_INSTRUCTION:
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if (node->data.attribute.type == subtype)
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return node;
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break;
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default:
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return node;
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}
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}
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return NULL;
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}
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/* Nodes */
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struct dom_node *
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init_dom_node_at(
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#ifdef DEBUG_MEMLEAK
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char *file, int line,
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#endif
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struct dom_node *parent, /*enum dom_node_type*/ uint16_t type,
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struct dom_string *string, int allocated)
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{
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#ifdef DEBUG_MEMLEAK
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struct dom_node *node = (struct dom_node *)debug_mem_calloc(file, line, 1, sizeof(*node));
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#else
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struct dom_node *node = (struct dom_node *)mem_calloc(1, sizeof(*node));
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#endif
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if (!node) return NULL;
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node->type = type;
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node->parent = parent;
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/* Make it possible to add a node to a parent without allocating the
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* strings. */
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if (allocated >= 0) {
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node->allocated = !!allocated;
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} else if (parent) {
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node->allocated = parent->allocated;
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}
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if (node->allocated) {
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if (!init_dom_string(&node->string, string->string, string->length)) {
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done_dom_node(node);
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return NULL;
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}
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} else {
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copy_dom_string(&node->string, string);
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}
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if (parent) {
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struct dom_node_list **list = get_dom_node_list(parent, node);
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int sort = (type == DOM_NODE_ATTRIBUTE);
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int index;
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assertm(list != NULL, "Adding node %d to bad parent %d",
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node->type, parent->type);
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index = *list && (*list)->size > 0 && sort
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? get_dom_node_map_index(*list, node) : -1;
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if (!add_to_dom_node_list(list, node, index)) {
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done_dom_node(node);
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return NULL;
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}
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}
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return node;
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}
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void
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done_dom_node_data(struct dom_node *node)
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{
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union dom_node_data *data;
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assert(node);
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assert(node->type < DOM_NODES); /* unsigned comparison */
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data = &node->data;
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switch (node->type) {
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case DOM_NODE_ATTRIBUTE:
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if (node->allocated)
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done_dom_string(&data->attribute.value);
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break;
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case DOM_NODE_DOCUMENT:
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if (data->document.children)
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done_dom_node_list(data->document.children);
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break;
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case DOM_NODE_ELEMENT:
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if (data->element.children)
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done_dom_node_list(data->element.children);
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if (data->element.map)
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done_dom_node_list(data->element.map);
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break;
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case DOM_NODE_PROCESSING_INSTRUCTION:
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if (data->proc_instruction.map)
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done_dom_node_list(data->proc_instruction.map);
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if (node->allocated)
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done_dom_string(&data->proc_instruction.instruction);
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break;
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default:
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break;
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}
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if (node->allocated)
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done_dom_string(&node->string);
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/* call_dom_stack_callbacks() asserts that the node type is
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* within range. If assertions are enabled, store an
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* out-of-range value there to make the assertion more likely
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* to fail if a callback has freed the node prematurely.
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* This is not entirely reliable though, because the memory
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* is freed below and may be allocated for some other purpose
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* before the assertion. */
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#ifndef CONFIG_FASTMEM
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node->type = -1;
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#endif
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mem_free(node);
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}
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void
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done_dom_node(struct dom_node *node)
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{
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assert(node);
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if (node->parent) {
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struct dom_node *parent = node->parent;
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union dom_node_data *data = &parent->data;
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switch (parent->type) {
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case DOM_NODE_DOCUMENT:
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del_from_dom_node_list(data->document.children, node);
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break;
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case DOM_NODE_ELEMENT:
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del_from_dom_node_list(data->element.children, node);
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del_from_dom_node_list(data->element.map, node);
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break;
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case DOM_NODE_PROCESSING_INSTRUCTION:
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del_from_dom_node_list(data->proc_instruction.map, node);
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break;
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default:
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break;
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}
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}
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done_dom_node_data(node);
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}
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#define set_node_name(name, namelen, str) \
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do { (name) = (str); (namelen) = sizeof(str) - 1; } while (0)
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struct dom_string *
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get_dom_node_name(struct dom_node *node)
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{
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static struct dom_string cdata_section_str = STATIC_DOM_STRING("#cdata-section");
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static struct dom_string comment_str = STATIC_DOM_STRING("#comment");
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static struct dom_string document_str = STATIC_DOM_STRING("#document");
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static struct dom_string document_fragment_str = STATIC_DOM_STRING("#document-fragment");
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static struct dom_string text_str = STATIC_DOM_STRING("#text");
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assert(node);
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switch (node->type) {
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case DOM_NODE_CDATA_SECTION:
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return &cdata_section_str;
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case DOM_NODE_COMMENT:
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return &comment_str;
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case DOM_NODE_DOCUMENT:
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return &document_str;
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case DOM_NODE_DOCUMENT_FRAGMENT:
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return &document_fragment_str;
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case DOM_NODE_TEXT:
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return &text_str;
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case DOM_NODE_ATTRIBUTE:
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case DOM_NODE_DOCUMENT_TYPE:
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case DOM_NODE_ELEMENT:
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case DOM_NODE_ENTITY:
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case DOM_NODE_ENTITY_REFERENCE:
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case DOM_NODE_NOTATION:
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case DOM_NODE_PROCESSING_INSTRUCTION:
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default:
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return &node->string;
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}
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}
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struct dom_string *
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get_dom_node_value(struct dom_node *node)
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{
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assert(node);
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switch (node->type) {
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case DOM_NODE_ATTRIBUTE:
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return &node->data.attribute.value;
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case DOM_NODE_PROCESSING_INSTRUCTION:
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return &node->data.proc_instruction.instruction;
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case DOM_NODE_CDATA_SECTION:
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case DOM_NODE_COMMENT:
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case DOM_NODE_TEXT:
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return &node->string;
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case DOM_NODE_ENTITY_REFERENCE:
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case DOM_NODE_NOTATION:
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case DOM_NODE_DOCUMENT:
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case DOM_NODE_DOCUMENT_FRAGMENT:
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case DOM_NODE_DOCUMENT_TYPE:
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case DOM_NODE_ELEMENT:
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case DOM_NODE_ENTITY:
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default:
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return NULL;
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}
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}
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struct dom_string *
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get_dom_node_type_name(/*enum dom_node_type*/ uint16_t type)
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{
|
|
static struct dom_string dom_node_type_names[DOM_NODES] = {
|
|
INIT_DOM_STRING(NULL, 0),
|
|
/* DOM_NODE_ELEMENT */ STATIC_DOM_STRING("element"),
|
|
/* DOM_NODE_ATTRIBUTE */ STATIC_DOM_STRING("attribute"),
|
|
/* DOM_NODE_TEXT */ STATIC_DOM_STRING("text"),
|
|
/* DOM_NODE_CDATA_SECTION */ STATIC_DOM_STRING("cdata-section"),
|
|
/* DOM_NODE_ENTITY_REFERENCE */ STATIC_DOM_STRING("entity-reference"),
|
|
/* DOM_NODE_ENTITY */ STATIC_DOM_STRING("entity"),
|
|
/* DOM_NODE_PROCESSING_INSTRUCTION */ STATIC_DOM_STRING("proc-instruction"),
|
|
/* DOM_NODE_COMMENT */ STATIC_DOM_STRING("comment"),
|
|
/* DOM_NODE_DOCUMENT */ STATIC_DOM_STRING("document"),
|
|
/* DOM_NODE_DOCUMENT_TYPE */ STATIC_DOM_STRING("document-type"),
|
|
/* DOM_NODE_DOCUMENT_FRAGMENT */ STATIC_DOM_STRING("document-fragment"),
|
|
/* DOM_NODE_NOTATION */ STATIC_DOM_STRING("notation"),
|
|
};
|
|
|
|
assert(type < DOM_NODES);
|
|
|
|
return &dom_node_type_names[type];
|
|
}
|