mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-22 22:41:30 +03:00
368 lines
8.3 KiB
C
368 lines
8.3 KiB
C
/*
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* Copyright 2012 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* libdom utilities (implementation).
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*/
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#include <assert.h>
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#include <dom/dom.h>
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#include "utils/config.h"
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#include "utils/log.h"
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#include "utils/libdom.h"
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/* exported interface documented in libdom.h */
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bool libdom_treewalk(dom_node *root,
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bool (*callback)(dom_node *node, dom_string *name, void *ctx),
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void *ctx)
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{
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dom_node *node;
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bool result = true;
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node = dom_node_ref(root); /* tree root */
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while (node != NULL) {
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dom_node *next = NULL;
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dom_node_type type;
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dom_string *name;
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dom_exception exc;
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exc = dom_node_get_first_child(node, &next);
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if (exc != DOM_NO_ERR) {
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dom_node_unref(node);
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break;
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}
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if (next != NULL) {
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/* 1. Got children */
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dom_node_unref(node);
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node = next;
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} else {
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/* No children; siblings & ancestor's siblings */
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while (node != NULL) {
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exc = dom_node_get_next_sibling(node, &next);
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if (exc != DOM_NO_ERR) {
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dom_node_unref(node);
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node = NULL;
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break;
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}
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if (next != NULL) {
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/* 2. Got sibling */
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break;
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}
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exc = dom_node_get_parent_node(node, &next);
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if (exc != DOM_NO_ERR) {
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dom_node_unref(node);
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node = NULL;
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break;
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}
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/* 3. Try parent */
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dom_node_unref(node);
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node = next;
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}
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if (node == NULL)
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break;
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dom_node_unref(node);
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node = next;
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}
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assert(node != NULL);
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exc = dom_node_get_node_type(node, &type);
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if ((exc != DOM_NO_ERR) || (type != DOM_ELEMENT_NODE))
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continue;
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exc = dom_node_get_node_name(node, &name);
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if (exc != DOM_NO_ERR)
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continue;
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result = callback(node, name, ctx);
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dom_string_unref(name);
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if (result == false) {
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break; /* callback caused early termination */
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}
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}
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return result;
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}
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/* libdom_treewalk context for libdom_find_element */
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struct find_element_ctx {
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lwc_string *search;
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dom_node *found;
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};
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/* libdom_treewalk callback for libdom_find_element */
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static bool libdom_find_element_callback(dom_node *node, dom_string *name,
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void *ctx)
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{
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struct find_element_ctx *data = ctx;
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if (dom_string_caseless_lwc_isequal(name, data->search)) {
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/* Found element */
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data->found = node;
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return false; /* Discontinue search */
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}
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return true; /* Continue search */
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}
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/* exported interface documented in libdom.h */
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dom_node *libdom_find_element(dom_node *node, lwc_string *element_name)
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{
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struct find_element_ctx data;
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assert(element_name != NULL);
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if (node == NULL)
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return NULL;
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data.search = element_name;
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data.found = NULL;
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libdom_treewalk(node, libdom_find_element_callback, &data);
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return data.found;
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}
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/* exported interface documented in libdom.h */
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dom_node *libdom_find_first_element(dom_node *parent, lwc_string *element_name)
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{
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dom_node *element;
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dom_exception exc;
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dom_string *node_name = NULL;
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dom_node_type node_type;
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dom_node *next_node;
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exc = dom_node_get_first_child(parent, &element);
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if ((exc != DOM_NO_ERR) || (element == NULL)) {
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return NULL;
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}
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/* find first node thats a element */
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do {
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exc = dom_node_get_node_type(element, &node_type);
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if ((exc == DOM_NO_ERR) && (node_type == DOM_ELEMENT_NODE)) {
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exc = dom_node_get_node_name(element, &node_name);
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if ((exc == DOM_NO_ERR) && (node_name != NULL)) {
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if (dom_string_caseless_lwc_isequal(node_name,
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element_name)) {
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dom_string_unref(node_name);
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break;
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}
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dom_string_unref(node_name);
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}
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}
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exc = dom_node_get_next_sibling(element, &next_node);
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dom_node_unref(element);
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if (exc == DOM_NO_ERR) {
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element = next_node;
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} else {
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element = NULL;
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}
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} while (element != NULL);
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return element;
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}
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/* exported interface documented in libdom.h */
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/* TODO: return appropriate errors */
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nserror libdom_iterate_child_elements(dom_node *parent,
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libdom_iterate_cb cb, void *ctx)
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{
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dom_nodelist *children;
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uint32_t index, num_children;
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dom_exception error;
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error = dom_node_get_child_nodes(parent, &children);
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if (error != DOM_NO_ERR || children == NULL)
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return NSERROR_NOMEM;
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error = dom_nodelist_get_length(children, &num_children);
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if (error != DOM_NO_ERR) {
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dom_nodelist_unref(children);
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return NSERROR_NOMEM;
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}
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for (index = 0; index < num_children; index++) {
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dom_node *child;
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dom_node_type type;
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error = dom_nodelist_item(children, index, &child);
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if (error != DOM_NO_ERR) {
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dom_nodelist_unref(children);
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return NSERROR_NOMEM;
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}
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error = dom_node_get_node_type(child, &type);
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if (error == DOM_NO_ERR && type == DOM_ELEMENT_NODE) {
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nserror err = cb(child, ctx);
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if (err != NSERROR_OK) {
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dom_node_unref(child);
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dom_nodelist_unref(children);
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return err;
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}
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}
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dom_node_unref(child);
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}
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dom_nodelist_unref(children);
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return NSERROR_OK;
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}
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/* exported interface documented in libdom.h */
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nserror libdom_hubbub_error_to_nserror(dom_hubbub_error error)
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{
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switch (error) {
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/* HUBBUB_REPROCESS is not handled here because it can
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* never occur outside the hubbub treebuilder
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*/
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case DOM_HUBBUB_OK:
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/* parsed ok */
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return NSERROR_OK;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_PAUSED):
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/* hubbub input paused */
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return NSERROR_OK;
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case DOM_HUBBUB_NOMEM:
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/* out of memory error from DOM */
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return NSERROR_NOMEM;
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case DOM_HUBBUB_BADPARM:
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/* Bad parameter passed to creation */
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return NSERROR_BAD_PARAMETER;
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case DOM_HUBBUB_DOM:
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/* DOM call returned error */
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return NSERROR_DOM;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_ENCODINGCHANGE):
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/* encoding changed */
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return NSERROR_ENCODING_CHANGE;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_NOMEM):
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/* out of memory error from parser */
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return NSERROR_NOMEM;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_BADPARM):
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return NSERROR_BAD_PARAMETER;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_INVALID):
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return NSERROR_INVALID;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_FILENOTFOUND):
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return NSERROR_NOT_FOUND;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_NEEDDATA):
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return NSERROR_NEED_DATA;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_BADENCODING):
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return NSERROR_BAD_ENCODING;
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case (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_UNKNOWN):
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/* currently only generated by the libdom hubbub binding */
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return NSERROR_DOM;
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default:
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/* unknown error */
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/** @todo better error handling and reporting */
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return NSERROR_UNKNOWN;
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}
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return NSERROR_UNKNOWN;
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}
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static void ignore_dom_msg(uint32_t severity, void *ctx, const char *msg, ...)
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{
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}
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/* exported interface documented in libdom.h */
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nserror libdom_parse_file(const char *filename, const char *encoding, dom_document **doc)
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{
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dom_hubbub_parser_params parse_params;
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dom_hubbub_error error;
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dom_hubbub_parser *parser;
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dom_document *document;
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FILE *fp = NULL;
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#define BUF_SIZE 512
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uint8_t buf[BUF_SIZE];
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fp = fopen(filename, "r");
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if (fp == NULL) {
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return NSERROR_NOT_FOUND;
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}
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parse_params.enc = encoding;
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parse_params.fix_enc = false;
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parse_params.enable_script = false;
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parse_params.msg = ignore_dom_msg;
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parse_params.script = NULL;
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parse_params.ctx = NULL;
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parse_params.daf = NULL;
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error = dom_hubbub_parser_create(&parse_params, &parser, &document);
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if (error != DOM_HUBBUB_OK) {
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fclose(fp);
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return libdom_hubbub_error_to_nserror(error);
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}
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while (feof(fp) == 0) {
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size_t read = fread(buf, sizeof(buf[0]), BUF_SIZE, fp);
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error = dom_hubbub_parser_parse_chunk(parser, buf, read);
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if (error != DOM_HUBBUB_OK) {
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dom_node_unref(document);
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dom_hubbub_parser_destroy(parser);
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fclose(fp);
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return NSERROR_DOM;
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}
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}
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error = dom_hubbub_parser_completed(parser);
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if (error != DOM_HUBBUB_OK) {
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dom_node_unref(document);
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dom_hubbub_parser_destroy(parser);
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fclose(fp);
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return libdom_hubbub_error_to_nserror(error);
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}
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dom_hubbub_parser_destroy(parser);
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fclose(fp);
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*doc = document;
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return NSERROR_OK;
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}
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