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netsurf/render/box_construct.c

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/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
* Copyright 2005 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2006 Richard Wilson <info@tinct.net>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* Conversion of XML tree to box tree (implementation).
*/
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "utils/config.h"
#include "content/content_protected.h"
#include "css/css.h"
#include "css/utils.h"
#include "css/select.h"
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/locale.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/utils.h"
#include "desktop/gui_misc.h"
#include "desktop/gui_internal.h"
#include "render/box.h"
#include "render/box_textarea.h"
#include "render/form_internal.h"
#include "render/html_internal.h"
/**
* Context for box tree construction
*/
struct box_construct_ctx {
html_content *content; /**< Content we're constructing for */
dom_node *n; /**< Current node to process */
struct box *root_box; /**< Root box in the tree */
box_construct_complete_cb cb; /**< Callback to invoke on completion */
int *bctx; /**< talloc context */
};
/**
* Transient properties for construction of current node
*/
struct box_construct_props {
/** Style from which to inherit, or NULL if none */
const css_computed_style *parent_style;
/** Current link target, or NULL if none */
nsurl *href;
/** Current frame target, or NULL if none */
const char *target;
/** Current title attribute, or NULL if none */
const char *title;
/** Identity of the current block-level container */
struct box *containing_block;
/** Current container for inlines, or NULL if none
* \note If non-NULL, will be the last child of containing_block */
struct box *inline_container;
/** Whether the current node is the root of the DOM tree */
bool node_is_root;
};
static const content_type image_types = CONTENT_IMAGE;
/* the strings are not important, since we just compare the pointers */
const char *TARGET_SELF = "_self";
const char *TARGET_PARENT = "_parent";
const char *TARGET_TOP = "_top";
const char *TARGET_BLANK = "_blank";
static void convert_xml_to_box(struct box_construct_ctx *ctx);
static bool box_construct_element(struct box_construct_ctx *ctx,
bool *convert_children);
static void box_construct_element_after(dom_node *n, html_content *content);
static bool box_construct_text(struct box_construct_ctx *ctx);
static css_select_results * box_get_style(html_content *c,
const css_computed_style *parent_style, dom_node *n);
static void box_text_transform(char *s, unsigned int len,
enum css_text_transform_e tt);
#define BOX_SPECIAL_PARAMS dom_node *n, html_content *content, \
struct box *box, bool *convert_children
static bool box_a(BOX_SPECIAL_PARAMS);
static bool box_body(BOX_SPECIAL_PARAMS);
static bool box_br(BOX_SPECIAL_PARAMS);
static bool box_image(BOX_SPECIAL_PARAMS);
static bool box_textarea(BOX_SPECIAL_PARAMS);
static bool box_select(BOX_SPECIAL_PARAMS);
static bool box_input(BOX_SPECIAL_PARAMS);
static bool box_button(BOX_SPECIAL_PARAMS);
static bool box_frameset(BOX_SPECIAL_PARAMS);
static bool box_create_frameset(struct content_html_frames *f, dom_node *n,
html_content *content);
static bool box_select_add_option(struct form_control *control, dom_node *n);
static bool box_noscript(BOX_SPECIAL_PARAMS);
static bool box_object(BOX_SPECIAL_PARAMS);
static bool box_embed(BOX_SPECIAL_PARAMS);
static bool box_pre(BOX_SPECIAL_PARAMS);
static bool box_iframe(BOX_SPECIAL_PARAMS);
static bool box_get_attribute(dom_node *n, const char *attribute,
void *context, char **value);
static struct frame_dimension *box_parse_multi_lengths(const char *s,
unsigned int *count);
/* element_table must be sorted by name */
struct element_entry {
char name[10]; /* element type */
bool (*convert)(BOX_SPECIAL_PARAMS);
};
static const struct element_entry element_table[] = {
{"a", box_a},
{"body", box_body},
{"br", box_br},
{"button", box_button},
{"embed", box_embed},
{"frameset", box_frameset},
{"iframe", box_iframe},
{"image", box_image},
{"img", box_image},
{"input", box_input},
{"noscript", box_noscript},
{"object", box_object},
{"pre", box_pre},
{"select", box_select},
{"textarea", box_textarea}
};
#define ELEMENT_TABLE_COUNT (sizeof(element_table) / sizeof(element_table[0]))
/**
* Construct a box tree from an xml tree and stylesheets.
*
* \param n xml tree
* \param c content of type CONTENT_HTML to construct box tree in
* \param cb callback to report conversion completion
* \return netsurf error code indicating status of call
*/
nserror dom_to_box(dom_node *n, html_content *c, box_construct_complete_cb cb)
{
struct box_construct_ctx *ctx;
if (c->bctx == NULL) {
/* create a context allocation for this box tree */
c->bctx = talloc_zero(0, int);
if (c->bctx == NULL) {
return NSERROR_NOMEM;
}
}
ctx = malloc(sizeof(*ctx));
if (ctx == NULL) {
return NSERROR_NOMEM;
}
ctx->content = c;
ctx->n = dom_node_ref(n);
ctx->root_box = NULL;
ctx->cb = cb;
ctx->bctx = c->bctx;
return guit->browser->schedule(0, (void *)convert_xml_to_box, ctx);
}
/* mapping from CSS display to box type
* this table must be in sync with libcss' css_display enum */
static const box_type box_map[] = {
0, /*CSS_DISPLAY_INHERIT,*/
BOX_INLINE, /*CSS_DISPLAY_INLINE,*/
BOX_BLOCK, /*CSS_DISPLAY_BLOCK,*/
BOX_BLOCK, /*CSS_DISPLAY_LIST_ITEM,*/
BOX_INLINE, /*CSS_DISPLAY_RUN_IN,*/
BOX_INLINE_BLOCK, /*CSS_DISPLAY_INLINE_BLOCK,*/
BOX_TABLE, /*CSS_DISPLAY_TABLE,*/
BOX_TABLE, /*CSS_DISPLAY_INLINE_TABLE,*/
BOX_TABLE_ROW_GROUP, /*CSS_DISPLAY_TABLE_ROW_GROUP,*/
BOX_TABLE_ROW_GROUP, /*CSS_DISPLAY_TABLE_HEADER_GROUP,*/
BOX_TABLE_ROW_GROUP, /*CSS_DISPLAY_TABLE_FOOTER_GROUP,*/
BOX_TABLE_ROW, /*CSS_DISPLAY_TABLE_ROW,*/
BOX_NONE, /*CSS_DISPLAY_TABLE_COLUMN_GROUP,*/
BOX_NONE, /*CSS_DISPLAY_TABLE_COLUMN,*/
BOX_TABLE_CELL, /*CSS_DISPLAY_TABLE_CELL,*/
BOX_INLINE, /*CSS_DISPLAY_TABLE_CAPTION,*/
BOX_NONE /*CSS_DISPLAY_NONE*/
};
static inline struct box *box_for_node(dom_node *n)
{
struct box *box = NULL;
dom_exception err;
err = dom_node_get_user_data(n, corestring_dom___ns_key_box_node_data,
(void *) &box);
if (err != DOM_NO_ERR)
return NULL;
return box;
}
static inline bool box_is_root(dom_node *n)
{
dom_node *parent;
dom_node_type type;
dom_exception err;
err = dom_node_get_parent_node(n, &parent);
if (err != DOM_NO_ERR)
return false;
if (parent != NULL) {
err = dom_node_get_node_type(parent, &type);
dom_node_unref(parent);
if (err != DOM_NO_ERR)
return false;
if (type != DOM_DOCUMENT_NODE)
return false;
}
return true;
}
/**
* Find the next node in the DOM tree, completing
* element construction where appropriate.
*
* \param n Current node
* \param content Containing content
* \param convert_children Whether to consider children of \a n
* \return Next node to process, or NULL if complete
*
* \note \a n will be unreferenced
*/
static dom_node *next_node(dom_node *n, html_content *content,
bool convert_children)
{
dom_node *next = NULL;
bool has_children;
dom_exception err;
err = dom_node_has_child_nodes(n, &has_children);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return NULL;
}
if (convert_children && has_children) {
err = dom_node_get_first_child(n, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return NULL;
}
dom_node_unref(n);
} else {
err = dom_node_get_next_sibling(n, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return NULL;
}
if (next != NULL) {
if (box_for_node(n) != NULL)
box_construct_element_after(n, content);
dom_node_unref(n);
} else {
if (box_for_node(n) != NULL)
box_construct_element_after(n, content);
while (box_is_root(n) == false) {
dom_node *parent = NULL;
dom_node *parent_next = NULL;
err = dom_node_get_parent_node(n, &parent);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return NULL;
}
assert(parent != NULL);
err = dom_node_get_next_sibling(parent,
&parent_next);
if (err != DOM_NO_ERR) {
dom_node_unref(parent);
dom_node_unref(n);
return NULL;
}
if (parent_next != NULL) {
dom_node_unref(parent_next);
dom_node_unref(parent);
break;
}
dom_node_unref(n);
n = parent;
parent = NULL;
if (box_for_node(n) != NULL) {
box_construct_element_after(
n, content);
}
}
if (box_is_root(n) == false) {
dom_node *parent = NULL;
err = dom_node_get_parent_node(n, &parent);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return NULL;
}
assert(parent != NULL);
err = dom_node_get_next_sibling(parent, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(parent);
dom_node_unref(n);
return NULL;
}
if (box_for_node(parent) != NULL) {
box_construct_element_after(parent,
content);
}
dom_node_unref(parent);
}
dom_node_unref(n);
}
}
return next;
}
/**
* Convert an ELEMENT node to a box tree fragment,
* then schedule conversion of the next ELEMENT node
*/
void convert_xml_to_box(struct box_construct_ctx *ctx)
{
dom_node *next;
bool convert_children;
uint32_t num_processed = 0;
const uint32_t max_processed_before_yield = 10;
do {
convert_children = true;
assert(ctx->n != NULL);
if (box_construct_element(ctx, &convert_children) == false) {
ctx->cb(ctx->content, false);
dom_node_unref(ctx->n);
free(ctx);
return;
}
/* Find next element to process, converting text nodes as we go */
next = next_node(ctx->n, ctx->content, convert_children);
while (next != NULL) {
dom_node_type type;
dom_exception err;
err = dom_node_get_node_type(next, &type);
if (err != DOM_NO_ERR) {
ctx->cb(ctx->content, false);
dom_node_unref(next);
free(ctx);
return;
}
if (type == DOM_ELEMENT_NODE)
break;
if (type == DOM_TEXT_NODE) {
ctx->n = next;
if (box_construct_text(ctx) == false) {
ctx->cb(ctx->content, false);
dom_node_unref(ctx->n);
free(ctx);
return;
}
}
next = next_node(next, ctx->content, true);
}
ctx->n = next;
if (next == NULL) {
/* Conversion complete */
struct box root;
memset(&root, 0, sizeof(root));
root.type = BOX_BLOCK;
root.children = root.last = ctx->root_box;
root.children->parent = &root;
/** \todo Remove box_normalise_block */
if (box_normalise_block(&root, ctx->content) == false) {
ctx->cb(ctx->content, false);
} else {
ctx->content->layout = root.children;
ctx->content->layout->parent = NULL;
ctx->cb(ctx->content, true);
}
assert(ctx->n == NULL);
free(ctx);
return;
}
} while (++num_processed < max_processed_before_yield);
/* More work to do: schedule a continuation */
guit->browser->schedule(0, (void *)convert_xml_to_box, ctx);
}
/**
* Construct a list marker box
*
* \param box Box to attach marker to
* \param title Current title attribute
* \param ctx Box construction context
* \param parent Current block-level container
* \return true on success, false on memory exhaustion
*/
static bool box_construct_marker(struct box *box, const char *title,
struct box_construct_ctx *ctx, struct box *parent)
{
lwc_string *image_uri;
struct box *marker;
marker = box_create(NULL, box->style, false, NULL, NULL, title,
NULL, ctx->bctx);
if (marker == false)
return false;
marker->type = BOX_BLOCK;
/** \todo marker content (list-style-type) */
switch (css_computed_list_style_type(box->style)) {
case CSS_LIST_STYLE_TYPE_DISC:
/* 2022 BULLET */
marker->text = (char *) "\342\200\242";
marker->length = 3;
break;
case CSS_LIST_STYLE_TYPE_CIRCLE:
/* 25CB WHITE CIRCLE */
marker->text = (char *) "\342\227\213";
marker->length = 3;
break;
case CSS_LIST_STYLE_TYPE_SQUARE:
/* 25AA BLACK SMALL SQUARE */
marker->text = (char *) "\342\226\252";
marker->length = 3;
break;
case CSS_LIST_STYLE_TYPE_DECIMAL:
case CSS_LIST_STYLE_TYPE_LOWER_ALPHA:
case CSS_LIST_STYLE_TYPE_LOWER_ROMAN:
case CSS_LIST_STYLE_TYPE_UPPER_ALPHA:
case CSS_LIST_STYLE_TYPE_UPPER_ROMAN:
default:
if (parent->last) {
struct box *last = parent->last;
/* Drill down into last child of parent
* to find the list marker (if any)
*
* Floated list boxes end up as:
*
* parent
* BOX_INLINE_CONTAINER
* BOX_FLOAT_{LEFT,RIGHT}
* BOX_BLOCK <-- list box
* ...
*/
while (last != NULL && last->list_marker == NULL) {
struct box *last_inner = last;
while (last_inner != NULL) {
if (last_inner->list_marker != NULL)
break;
if (last_inner->type ==
BOX_INLINE_CONTAINER ||
last_inner->type ==
BOX_FLOAT_LEFT ||
last_inner->type ==
BOX_FLOAT_RIGHT) {
last_inner = last_inner->last;
} else {
last_inner = NULL;
}
}
if (last_inner != NULL) {
last = last_inner;
} else {
last = last->prev;
}
}
if (last && last->list_marker) {
marker->rows = last->list_marker->rows + 1;
}
}
marker->text = talloc_array(ctx->bctx, char, 20);
if (marker->text == NULL)
return false;
snprintf(marker->text, 20, "%u.", marker->rows);
marker->length = strlen(marker->text);
break;
case CSS_LIST_STYLE_TYPE_NONE:
marker->text = 0;
marker->length = 0;
break;
}
if (css_computed_list_style_image(box->style, &image_uri) == CSS_LIST_STYLE_IMAGE_URI &&
(image_uri != NULL) &&
(nsoption_bool(foreground_images) == true)) {
nsurl *url;
nserror error;
/* TODO: we get a url out of libcss as a lwc string, but
* earlier we already had it as a nsurl after we
* nsurl_joined it. Can this be improved?
* For now, just making another nsurl. */
error = nsurl_create(lwc_string_data(image_uri), &url);
if (error != NSERROR_OK)
return false;
if (html_fetch_object(ctx->content, url, marker, image_types,
ctx->content->base.available_width, 1000, false) ==
false) {
nsurl_unref(url);
return false;
}
nsurl_unref(url);
}
box->list_marker = marker;
marker->parent = box;
return true;
}
/**
* Construct the box required for a generated element.
*
* \param n XML node of type XML_ELEMENT_NODE
* \param content Content of type CONTENT_HTML that is being processed
* \param box Box which may have generated content
* \param style Complete computed style for pseudo element, or NULL
*
* TODO:
* This is currently incomplete. It just does enough to support the clearfix
* hack. ( http://www.positioniseverything.net/easyclearing.html )
*/
static void box_construct_generate(dom_node *n, html_content *content,
struct box *box, const css_computed_style *style)
{
struct box *gen = NULL;
const css_computed_content_item *c_item;
/* Nothing to generate if the parent box is not a block */
if (box->type != BOX_BLOCK)
return;
/* To determine if an element has a pseudo element, we select
* for it and test to see if the returned style's content
* property is set to normal. */
if (style == NULL ||
css_computed_content(style, &c_item) ==
CSS_CONTENT_NORMAL) {
/* No pseudo element */
return;
}
/* create box for this element */
if (css_computed_display(style, box_is_root(n)) == CSS_DISPLAY_BLOCK) {
/* currently only support block level elements */
/** \todo Not wise to drop const from the computed style */
gen = box_create(NULL, (css_computed_style *) style,
false, NULL, NULL, NULL, NULL, content->bctx);
if (gen == NULL) {
return;
}
/* set box type from computed display */
gen->type = box_map[css_computed_display(
style, box_is_root(n))];
box_add_child(box, gen);
}
}
/**
* Extract transient construction properties
*
* \param n Current DOM node to convert
* \param props Property object to populate
*/
static void box_extract_properties(dom_node *n,
struct box_construct_props *props)
{
memset(props, 0, sizeof(*props));
props->node_is_root = box_is_root(n);
/* Extract properties from containing DOM node */
if (props->node_is_root == false) {
dom_node *current_node = n;
dom_node *parent_node = NULL;
struct box *parent_box;
dom_exception err;
/* Find ancestor node containing parent box */
while (true) {
err = dom_node_get_parent_node(current_node,
&parent_node);
if (err != DOM_NO_ERR || parent_node == NULL)
break;
parent_box = box_for_node(parent_node);
if (parent_box != NULL) {
props->parent_style = parent_box->style;
props->href = parent_box->href;
props->target = parent_box->target;
props->title = parent_box->title;
dom_node_unref(parent_node);
break;
} else {
if (current_node != n)
dom_node_unref(current_node);
current_node = parent_node;
parent_node = NULL;
}
}
/* Find containing block (may be parent) */
while (true) {
struct box *b;
err = dom_node_get_parent_node(current_node,
&parent_node);
if (err != DOM_NO_ERR || parent_node == NULL) {
if (current_node != n)
dom_node_unref(current_node);
break;
}
if (current_node != n)
dom_node_unref(current_node);
b = box_for_node(parent_node);
/* Children of nodes that created an inline box
* will generate boxes which are attached as
* _siblings_ of the box generated for their
* parent node. Note, however, that we'll still
* use the parent node's styling as the parent
* style, above. */
if (b != NULL && b->type != BOX_INLINE &&
b->type != BOX_BR) {
props->containing_block = b;
dom_node_unref(parent_node);
break;
} else {
current_node = parent_node;
parent_node = NULL;
}
}
}
/* Compute current inline container, if any */
if (props->containing_block != NULL &&
props->containing_block->last != NULL &&
props->containing_block->last->type ==
BOX_INLINE_CONTAINER)
props->inline_container = props->containing_block->last;
}
/**
* Construct the box tree for an XML element.
*
* \param ctx Tree construction context
* \param convert_children Whether to convert children
* \return true on success, false on memory exhaustion
*/
bool box_construct_element(struct box_construct_ctx *ctx,
bool *convert_children)
{
dom_string *title0, *s;
lwc_string *id = NULL;
struct box *box = NULL, *old_box;
css_select_results *styles = NULL;
struct element_entry *element;
lwc_string *bgimage_uri;
dom_exception err;
struct box_construct_props props;
assert(ctx->n != NULL);
box_extract_properties(ctx->n, &props);
if (props.containing_block != NULL) {
/* In case the containing block is a pre block, we clear
* the PRE_STRIP flag since it is not used if we follow
* the pre with a tag */
props.containing_block->flags &= ~PRE_STRIP;
}
styles = box_get_style(ctx->content, props.parent_style, ctx->n);
if (styles == NULL)
return false;
/* Extract title attribute, if present */
err = dom_element_get_attribute(ctx->n, corestring_dom_title, &title0);
if (err != DOM_NO_ERR)
return false;
if (title0 != NULL) {
char *t = squash_whitespace(dom_string_data(title0));
dom_string_unref(title0);
if (t == NULL)
return false;
props.title = talloc_strdup(ctx->bctx, t);
free(t);
if (props.title == NULL)
return false;
}
/* Extract id attribute, if present */
err = dom_element_get_attribute(ctx->n, corestring_dom_id, &s);
if (err != DOM_NO_ERR)
return false;
if (s != NULL) {
err = dom_string_intern(s, &id);
if (err != DOM_NO_ERR)
id = NULL;
dom_string_unref(s);
}
box = box_create(styles, styles->styles[CSS_PSEUDO_ELEMENT_NONE], false,
props.href, props.target, props.title, id,
ctx->bctx);
if (box == NULL)
return false;
/* If this is the root box, add it to the context */
if (props.node_is_root)
ctx->root_box = box;
/* Deal with colspan/rowspan */
err = dom_element_get_attribute(ctx->n, corestring_dom_colspan, &s);
if (err != DOM_NO_ERR)
return false;
if (s != NULL) {
const char *val = dom_string_data(s);
if ('0' <= val[0] && val[0] <= '9')
box->columns = strtol(val, NULL, 10);
dom_string_unref(s);
}
err = dom_element_get_attribute(ctx->n, corestring_dom_rowspan, &s);
if (err != DOM_NO_ERR)
return false;
if (s != NULL) {
const char *val = dom_string_data(s);
if ('0' <= val[0] && val[0] <= '9')
box->rows = strtol(val, NULL, 10);
dom_string_unref(s);
}
/* Set box type from computed display */
if ((css_computed_position(box->style) == CSS_POSITION_ABSOLUTE ||
css_computed_position(box->style) ==
CSS_POSITION_FIXED) &&
(css_computed_display_static(box->style) ==
CSS_DISPLAY_INLINE ||
css_computed_display_static(box->style) ==
CSS_DISPLAY_INLINE_BLOCK ||
css_computed_display_static(box->style) ==
CSS_DISPLAY_INLINE_TABLE)) {
/* Special case for absolute positioning: make absolute inlines
* into inline block so that the boxes are constructed in an
* inline container as if they were not absolutely positioned.
* Layout expects and handles this. */
box->type = box_map[CSS_DISPLAY_INLINE_BLOCK];
} else if (props.node_is_root) {
/* Special case for root element: force it to BLOCK, or the
* rest of the layout will break. */
box->type = BOX_BLOCK;
} else {
/* Normal mapping */
box->type = box_map[css_computed_display(box->style,
props.node_is_root)];
}
/* Handle the :before pseudo element */
box_construct_generate(ctx->n, ctx->content, box,
box->styles->styles[CSS_PSEUDO_ELEMENT_BEFORE]);
err = dom_node_get_node_name(ctx->n, &s);
if (err != DOM_NO_ERR || s == NULL)
return false;
/* Special elements */
element = bsearch(dom_string_data(s), element_table,
ELEMENT_TABLE_COUNT, sizeof(element_table[0]),
(int (*)(const void *, const void *)) strcasecmp);
dom_string_unref(s);
if (element != NULL) {
/* A special convert function exists for this element */
if (element->convert(ctx->n, ctx->content, box,
convert_children) == false)
return false;
}
if (box->type == BOX_NONE || (css_computed_display(box->style,
props.node_is_root) == CSS_DISPLAY_NONE &&
props.node_is_root == false)) {
css_select_results_destroy(styles);
box->styles = NULL;
box->style = NULL;
/* Invalidate associated gadget, if any */
if (box->gadget != NULL) {
box->gadget->box = NULL;
box->gadget = NULL;
}
/* Can't do this, because the lifetimes of boxes and gadgets
* are inextricably linked. Fortunately, talloc will save us
* (for now) */
/* box_free_box(box); */
*convert_children = false;
return true;
}
/* Attach DOM node to box */
err = dom_node_set_user_data(ctx->n,
corestring_dom___ns_key_box_node_data, box, NULL,
(void *) &old_box);
if (err != DOM_NO_ERR)
return false;
/* Attach box to DOM node */
box->node = dom_node_ref(ctx->n);
if (props.inline_container == NULL &&
(box->type == BOX_INLINE ||
box->type == BOX_BR ||
box->type == BOX_INLINE_BLOCK ||
css_computed_float(box->style) == CSS_FLOAT_LEFT ||
css_computed_float(box->style) == CSS_FLOAT_RIGHT) &&
props.node_is_root == false) {
/* Found an inline child of a block without a current container
* (i.e. this box is the first child of its parent, or was
* preceded by block-level siblings) */
assert(props.containing_block != NULL &&
"Box must have containing block.");
props.inline_container = box_create(NULL, NULL, false, NULL,
NULL, NULL, NULL, ctx->bctx);
if (props.inline_container == NULL)
return false;
props.inline_container->type = BOX_INLINE_CONTAINER;
box_add_child(props.containing_block, props.inline_container);
}
/* Kick off fetch for any background image */
if (css_computed_background_image(box->style, &bgimage_uri) ==
CSS_BACKGROUND_IMAGE_IMAGE && bgimage_uri != NULL &&
nsoption_bool(background_images) == true) {
nsurl *url;
nserror error;
/* TODO: we get a url out of libcss as a lwc string, but
* earlier we already had it as a nsurl after we
* nsurl_joined it. Can this be improved?
* For now, just making another nsurl. */
error = nsurl_create(lwc_string_data(bgimage_uri), &url);
if (error == NSERROR_OK) {
/* Fetch image if we got a valid URL */
if (html_fetch_object(ctx->content, url, box,
image_types,
ctx->content->base.available_width,
1000, true) == false) {
nsurl_unref(url);
return false;
}
nsurl_unref(url);
}
}
if (*convert_children)
box->flags |= CONVERT_CHILDREN;
if (box->type == BOX_INLINE || box->type == BOX_BR ||
box->type == BOX_INLINE_BLOCK) {
/* Inline container must exist, as we'll have
* created it above if it didn't */
assert(props.inline_container != NULL);
box_add_child(props.inline_container, box);
} else {
if (css_computed_display(box->style, props.node_is_root) ==
CSS_DISPLAY_LIST_ITEM) {
/* List item: compute marker */
if (box_construct_marker(box, props.title, ctx,
props.containing_block) == false)
return false;
}
if (props.node_is_root == false &&
(css_computed_float(box->style) ==
CSS_FLOAT_LEFT ||
css_computed_float(box->style) ==
CSS_FLOAT_RIGHT)) {
/* Float: insert a float between the parent and box. */
struct box *flt = box_create(NULL, NULL, false,
props.href, props.target, props.title,
NULL, ctx->bctx);
if (flt == NULL)
return false;
if (css_computed_float(box->style) == CSS_FLOAT_LEFT)
flt->type = BOX_FLOAT_LEFT;
else
flt->type = BOX_FLOAT_RIGHT;
box_add_child(props.inline_container, flt);
box_add_child(flt, box);
} else {
/* Non-floated block-level box: add to containing block
* if there is one. If we're the root box, then there
* won't be. */
if (props.containing_block != NULL)
box_add_child(props.containing_block, box);
}
}
return true;
}
/**
* Complete construction of the box tree for an element.
*
* \param n DOM node to construct for
* \param content Containing document
*
* This will be called after all children of an element have been processed
*/
void box_construct_element_after(dom_node *n, html_content *content)
{
struct box_construct_props props;
struct box *box = box_for_node(n);
assert(box != NULL);
box_extract_properties(n, &props);
if (box->type == BOX_INLINE || box->type == BOX_BR) {
/* Insert INLINE_END into containing block */
struct box *inline_end;
bool has_children;
dom_exception err;
err = dom_node_has_child_nodes(n, &has_children);
if (err != DOM_NO_ERR)
return;
if (has_children == false ||
(box->flags & CONVERT_CHILDREN) == 0) {
/* No children, or didn't want children converted */
return;
}
if (props.inline_container == NULL) {
/* Create inline container if we don't have one */
props.inline_container = box_create(NULL, NULL, false,
NULL, NULL, NULL, NULL, content->bctx);
if (props.inline_container == NULL)
return;
props.inline_container->type = BOX_INLINE_CONTAINER;
box_add_child(props.containing_block,
props.inline_container);
}
inline_end = box_create(NULL, box->style, false,
box->href, box->target, box->title,
box->id == NULL ? NULL :
lwc_string_ref(box->id), content->bctx);
if (inline_end != NULL) {
inline_end->type = BOX_INLINE_END;
assert(props.inline_container != NULL);
box_add_child(props.inline_container, inline_end);
box->inline_end = inline_end;
inline_end->inline_end = box;
}
} else {
/* Handle the :after pseudo element */
box_construct_generate(n, content, box,
box->styles->styles[CSS_PSEUDO_ELEMENT_AFTER]);
}
}
/**
* Construct the box tree for an XML text node.
*
* \param ctx Tree construction context
* \return true on success, false on memory exhaustion
*/
bool box_construct_text(struct box_construct_ctx *ctx)
{
struct box_construct_props props;
struct box *box = NULL;
dom_string *content;
dom_exception err;
assert(ctx->n != NULL);
box_extract_properties(ctx->n, &props);
assert(props.containing_block != NULL);
err = dom_characterdata_get_data(ctx->n, &content);
if (err != DOM_NO_ERR || content == NULL)
return false;
if (css_computed_white_space(props.parent_style) ==
CSS_WHITE_SPACE_NORMAL ||
css_computed_white_space(props.parent_style) ==
CSS_WHITE_SPACE_NOWRAP) {
char *text;
text = squash_whitespace(dom_string_data(content));
dom_string_unref(content);
if (text == NULL)
return false;
/* if the text is just a space, combine it with the preceding
* text node, if any */
if (text[0] == ' ' && text[1] == 0) {
if (props.inline_container != NULL) {
assert(props.inline_container->last != NULL);
props.inline_container->last->space =
UNKNOWN_WIDTH;
}
free(text);
return true;
}
if (props.inline_container == NULL) {
/* Child of a block without a current container
* (i.e. this box is the first child of its parent, or
* was preceded by block-level siblings) */
props.inline_container = box_create(NULL, NULL, false,
NULL, NULL, NULL, NULL, ctx->bctx);
if (props.inline_container == NULL) {
free(text);
return false;
}
props.inline_container->type = BOX_INLINE_CONTAINER;
box_add_child(props.containing_block,
props.inline_container);
}
/** \todo Dropping const here is not clever */
box = box_create(NULL,
(css_computed_style *) props.parent_style,
false, props.href, props.target, props.title,
NULL, ctx->bctx);
if (box == NULL) {
free(text);
return false;
}
box->type = BOX_TEXT;
box->text = talloc_strdup(ctx->bctx, text);
free(text);
if (box->text == NULL)
return false;
box->length = strlen(box->text);
/* strip ending space char off */
if (box->length > 1 && box->text[box->length - 1] == ' ') {
box->space = UNKNOWN_WIDTH;
box->length--;
}
if (css_computed_text_transform(props.parent_style) !=
CSS_TEXT_TRANSFORM_NONE)
box_text_transform(box->text, box->length,
css_computed_text_transform(
props.parent_style));
box_add_child(props.inline_container, box);
if (box->text[0] == ' ') {
box->length--;
memmove(box->text, &box->text[1], box->length);
if (box->prev != NULL)
box->prev->space = UNKNOWN_WIDTH;
}
} else {
/* white-space: pre */
char *text;
size_t text_len = dom_string_byte_length(content);
size_t i;
char *current;
enum css_white_space_e white_space =
css_computed_white_space(props.parent_style);
/* note: pre-wrap/pre-line are unimplemented */
assert(white_space == CSS_WHITE_SPACE_PRE ||
white_space == CSS_WHITE_SPACE_PRE_LINE ||
white_space == CSS_WHITE_SPACE_PRE_WRAP);
text = malloc(text_len + 1);
dom_string_unref(content);
if (text == NULL)
return false;
memcpy(text, dom_string_data(content), text_len);
text[text_len] = '\0';
/* TODO: Handle tabs properly */
for (i = 0; i < text_len; i++)
if (text[i] == '\t')
text[i] = ' ';
if (css_computed_text_transform(props.parent_style) !=
CSS_TEXT_TRANSFORM_NONE)
box_text_transform(text, strlen(text),
css_computed_text_transform(
props.parent_style));
current = text;
/* swallow a single leading new line */
if (props.containing_block->flags & PRE_STRIP) {
switch (*current) {
case '\n':
current++;
break;
case '\r':
current++;
if (*current == '\n')
current++;
break;
}
props.containing_block->flags &= ~PRE_STRIP;
}
do {
size_t len = strcspn(current, "\r\n");
char old = current[len];
current[len] = 0;
if (props.inline_container == NULL) {
/* Child of a block without a current container
* (i.e. this box is the first child of its
* parent, or was preceded by block-level
* siblings) */
props.inline_container = box_create(NULL, NULL,
false, NULL, NULL, NULL, NULL,
ctx->bctx);
if (props.inline_container == NULL) {
free(text);
return false;
}
props.inline_container->type =
BOX_INLINE_CONTAINER;
box_add_child(props.containing_block,
props.inline_container);
}
/** \todo Dropping const isn't clever */
box = box_create(NULL,
(css_computed_style *) props.parent_style,
false, props.href, props.target, props.title,
NULL, ctx->bctx);
if (box == NULL) {
free(text);
return false;
}
box->type = BOX_TEXT;
box->text = talloc_strdup(ctx->bctx, current);
if (box->text == NULL) {
free(text);
return false;
}
box->length = strlen(box->text);
box_add_child(props.inline_container, box);
current[len] = old;
current += len;
if (current[0] != '\0') {
/* Linebreak: create new inline container */
props.inline_container = box_create(NULL, NULL,
false, NULL, NULL, NULL, NULL,
ctx->bctx);
if (props.inline_container == NULL) {
free(text);
return false;
}
props.inline_container->type =
BOX_INLINE_CONTAINER;
box_add_child(props.containing_block,
props.inline_container);
if (current[0] == '\r' && current[1] == '\n')
current += 2;
else
current++;
}
} while (*current);
free(text);
}
return true;
}
/**
* Get the style for an element.
*
* \param c content of type CONTENT_HTML that is being processed
* \param parent_style style at this point in xml tree, or NULL for root
* \param n node in xml tree
* \return the new style, or NULL on memory exhaustion
*/
css_select_results *box_get_style(html_content *c,
const css_computed_style *parent_style, dom_node *n)
{
dom_string *s;
dom_exception err;
css_stylesheet *inline_style = NULL;
css_select_results *styles;
nscss_select_ctx ctx;
/* Firstly, construct inline stylesheet, if any */
err = dom_element_get_attribute(n, corestring_dom_style, &s);
if (err != DOM_NO_ERR)
return NULL;
if (s != NULL) {
inline_style = nscss_create_inline_style(
(const uint8_t *) dom_string_data(s),
dom_string_byte_length(s),
c->encoding,
nsurl_access(c->base_url),
c->quirks != DOM_DOCUMENT_QUIRKS_MODE_NONE);
dom_string_unref(s);
if (inline_style == NULL)
return NULL;
}
/* Populate selection context */
ctx.ctx = c->select_ctx;
ctx.quirks = (c->quirks == DOM_DOCUMENT_QUIRKS_MODE_FULL);
ctx.base_url = c->base_url;
ctx.universal = c->universal;
ctx.parent_style = parent_style;
/* Select style for element */
styles = nscss_get_style(&ctx, n, CSS_MEDIA_SCREEN, inline_style);
/* No longer need inline style */
if (inline_style != NULL)
css_stylesheet_destroy(inline_style);
return styles;
}
/**
* Apply the CSS text-transform property to given text for its ASCII chars.
*
* \param s string to transform
* \param len length of s
* \param tt transform type
*/
void box_text_transform(char *s, unsigned int len, enum css_text_transform_e tt)
{
unsigned int i;
if (len == 0)
return;
switch (tt) {
case CSS_TEXT_TRANSFORM_UPPERCASE:
for (i = 0; i < len; ++i)
if ((unsigned char) s[i] < 0x80)
s[i] = ls_toupper(s[i]);
break;
case CSS_TEXT_TRANSFORM_LOWERCASE:
for (i = 0; i < len; ++i)
if ((unsigned char) s[i] < 0x80)
s[i] = ls_tolower(s[i]);
break;
case CSS_TEXT_TRANSFORM_CAPITALIZE:
if ((unsigned char) s[0] < 0x80)
s[0] = ls_toupper(s[0]);
for (i = 1; i < len; ++i)
if ((unsigned char) s[i] < 0x80 &&
ls_isspace(s[i - 1]))
s[i] = ls_toupper(s[i]);
break;
default:
break;
}
}
/**
* \name Special case element handlers
*
* These functions are called by box_construct_element() when an element is
* being converted, according to the entries in element_table.
*
* The parameters are the xmlNode, the content for the document, and a partly
* filled in box structure for the element.
*
* Return true on success, false on memory exhaustion. Set *convert_children
* to false if children of this element in the XML tree should be skipped (for
* example, if they have been processed in some special way already).
*
* Elements ordered as in the HTML 4.01 specification. Section numbers in
* brackets [] refer to the spec.
*
* \{
*/
/**
* Document body [7.5.1].
*/
bool box_body(BOX_SPECIAL_PARAMS)
{
css_color color;
css_computed_background_color(box->style, &color);
if (nscss_color_is_transparent(color))
content->background_colour = NS_TRANSPARENT;
else
content->background_colour = nscss_color_to_ns(color);
return true;
}
/**
* Forced line break [9.3.2].
*/
bool box_br(BOX_SPECIAL_PARAMS)
{
box->type = BOX_BR;
return true;
}
/**
* Preformatted text [9.3.4].
*/
bool box_pre(BOX_SPECIAL_PARAMS)
{
box->flags |= PRE_STRIP;
return true;
}
/**
* Anchor [12.2].
*/
bool box_a(BOX_SPECIAL_PARAMS)
{
bool ok;
nsurl *url;
dom_string *s;
dom_exception err;
err = dom_element_get_attribute(n, corestring_dom_href, &s);
if (err == DOM_NO_ERR && s != NULL) {
ok = box_extract_link(dom_string_data(s),
content->base_url, &url);
dom_string_unref(s);
if (!ok)
return false;
if (url) {
if (box->href != NULL)
nsurl_unref(box->href);
box->href = url;
}
}
/* name and id share the same namespace */
err = dom_element_get_attribute(n, corestring_dom_name, &s);
if (err == DOM_NO_ERR && s != NULL) {
lwc_string *lwc_name;
err = dom_string_intern(s, &lwc_name);
dom_string_unref(s);
if (err == DOM_NO_ERR) {
/* name replaces existing id
* TODO: really? */
if (box->id != NULL)
lwc_string_unref(box->id);
box->id = lwc_name;
}
}
/* target frame [16.3] */
err = dom_element_get_attribute(n, corestring_dom_target, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__blank))
box->target = TARGET_BLANK;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__top))
box->target = TARGET_TOP;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__parent))
box->target = TARGET_PARENT;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__self))
/* the default may have been overridden by a
* <base target=...>, so this is different to 0 */
box->target = TARGET_SELF;
else {
/* 6.16 says that frame names must begin with [a-zA-Z]
* This doesn't match reality, so just take anything */
box->target = talloc_strdup(content->bctx,
dom_string_data(s));
if (!box->target) {
dom_string_unref(s);
return false;
}
}
dom_string_unref(s);
}
return true;
}
/**
* Embedded image [13.2].
*/
bool box_image(BOX_SPECIAL_PARAMS)
{
bool ok;
dom_string *s;
dom_exception err;
nsurl *url;
enum css_width_e wtype;
enum css_height_e htype;
css_fixed value = 0;
css_unit wunit = CSS_UNIT_PX;
css_unit hunit = CSS_UNIT_PX;
if (box->style && css_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
/* handle alt text */
err = dom_element_get_attribute(n, corestring_dom_alt, &s);
if (err == DOM_NO_ERR && s != NULL) {
char *alt = squash_whitespace(dom_string_data(s));
dom_string_unref(s);
if (alt == NULL)
return false;
box->text = talloc_strdup(content->bctx, alt);
free(alt);
if (box->text == NULL)
return false;
box->length = strlen(box->text);
}
if (nsoption_bool(foreground_images) == false) {
return true;
}
/* imagemap associated with this image */
if (!box_get_attribute(n, "usemap", content->bctx, &box->usemap))
return false;
if (box->usemap && box->usemap[0] == '#')
box->usemap++;
/* get image URL */
err = dom_element_get_attribute(n, corestring_dom_src, &s);
if (err != DOM_NO_ERR || s == NULL)
return true;
if (box_extract_link(dom_string_data(s), content->base_url,
&url) == false) {
dom_string_unref(s);
return false;
}
dom_string_unref(s);
if (url == NULL)
return true;
/* start fetch */
ok = html_fetch_object(content, url, box, image_types,
content->base.available_width, 1000, false);
nsurl_unref(url);
wtype = css_computed_width(box->style, &value, &wunit);
htype = css_computed_height(box->style, &value, &hunit);
if (wtype == CSS_WIDTH_SET && wunit != CSS_UNIT_PCT &&
htype == CSS_HEIGHT_SET && hunit != CSS_UNIT_PCT) {
/* We know the dimensions the image will be shown at before it's
* fetched. */
box->flags |= REPLACE_DIM;
}
return ok;
}
/**
* Noscript element
*/
bool box_noscript(BOX_SPECIAL_PARAMS)
{
/* If scripting is enabled, do not display the contents of noscript */
if (nsoption_bool(enable_javascript))
*convert_children = false;
return true;
}
/**
* Destructor for object_params, for &lt;object&gt; elements
*
* \param o The object params being destroyed.
* \return 0 to allow talloc to continue destroying the tree.
*/
static int box_object_talloc_destructor(struct object_params *o)
{
if (o->codebase != NULL)
nsurl_unref(o->codebase);
if (o->classid != NULL)
nsurl_unref(o->classid);
if (o->data != NULL)
nsurl_unref(o->data);
return 0;
}
/**
* Generic embedded object [13.3].
*/
bool box_object(BOX_SPECIAL_PARAMS)
{
struct object_params *params;
struct object_param *param;
dom_string *codebase, *classid, *data;
dom_node *c;
dom_exception err;
if (box->style && css_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
if (box_get_attribute(n, "usemap", content->bctx, &box->usemap) ==
false)
return false;
if (box->usemap && box->usemap[0] == '#')
box->usemap++;
params = talloc(content->bctx, struct object_params);
if (params == NULL)
return false;
talloc_set_destructor(params, box_object_talloc_destructor);
params->data = NULL;
params->type = NULL;
params->codetype = NULL;
params->codebase = NULL;
params->classid = NULL;
params->params = NULL;
/* codebase, classid, and data are URLs
* (codebase is the base for the other two) */
err = dom_element_get_attribute(n, corestring_dom_codebase, &codebase);
if (err == DOM_NO_ERR && codebase != NULL) {
if (box_extract_link(dom_string_data(codebase),
content->base_url,
&params->codebase) == false) {
dom_string_unref(codebase);
return false;
}
dom_string_unref(codebase);
}
if (params->codebase == NULL)
params->codebase = nsurl_ref(content->base_url);
err = dom_element_get_attribute(n, corestring_dom_classid, &classid);
if (err == DOM_NO_ERR && classid != NULL) {
if (box_extract_link(dom_string_data(classid), params->codebase,
&params->classid) == false) {
dom_string_unref(classid);
return false;
}
dom_string_unref(classid);
}
err = dom_element_get_attribute(n, corestring_dom_data, &data);
if (err == DOM_NO_ERR && data != NULL) {
if (box_extract_link(dom_string_data(data), params->codebase,
&params->data) == false) {
dom_string_unref(data);
return false;
}
dom_string_unref(data);
}
if (params->classid == NULL && params->data == NULL)
/* nothing to embed; ignore */
return true;
/* Don't include ourself */
if (params->classid != NULL && nsurl_compare(content->base_url,
params->classid, NSURL_COMPLETE))
return true;
if (params->data != NULL && nsurl_compare(content->base_url,
params->data, NSURL_COMPLETE))
return true;
/* codetype and type are MIME types */
if (box_get_attribute(n, "codetype", params,
&params->codetype) == false)
return false;
if (box_get_attribute(n, "type", params, &params->type) == false)
return false;
/* classid && !data => classid is used (consult codetype)
* (classid || !classid) && data => data is used (consult type)
* !classid && !data => invalid; ignored */
if (params->classid != NULL && params->data == NULL &&
params->codetype != NULL) {
lwc_string *icodetype;
lwc_error lerror;
lerror = lwc_intern_string(params->codetype,
strlen(params->codetype), &icodetype);
if (lerror != lwc_error_ok)
return false;
if (content_factory_type_from_mime_type(icodetype) ==
CONTENT_NONE) {
/* can't handle this MIME type */
lwc_string_unref(icodetype);
return true;
}
lwc_string_unref(icodetype);
}
if (params->data != NULL && params->type != NULL) {
lwc_string *itype;
lwc_error lerror;
lerror = lwc_intern_string(params->type, strlen(params->type),
&itype);
if (lerror != lwc_error_ok)
return false;
if (content_factory_type_from_mime_type(itype) ==
CONTENT_NONE) {
/* can't handle this MIME type */
lwc_string_unref(itype);
return true;
}
lwc_string_unref(itype);
}
/* add parameters to linked list */
err = dom_node_get_first_child(n, &c);
if (err != DOM_NO_ERR)
return false;
while (c != NULL) {
dom_node *next;
dom_node_type type;
err = dom_node_get_node_type(c, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (type == DOM_ELEMENT_NODE) {
dom_string *name;
err = dom_node_get_node_name(c, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (!dom_string_caseless_lwc_isequal(name,
corestring_lwc_param)) {
/* The first non-param child is the start of
* the alt html. Therefore, we should break
* out of this loop. */
dom_node_unref(c);
break;
}
param = talloc(params, struct object_param);
if (param == NULL) {
dom_node_unref(c);
return false;
}
param->name = NULL;
param->value = NULL;
param->type = NULL;
param->valuetype = NULL;
param->next = NULL;
if (box_get_attribute(c, "name", param,
&param->name) == false) {
dom_node_unref(c);
return false;
}
if (box_get_attribute(c, "value", param,
&param->value) == false) {
dom_node_unref(c);
return false;
}
if (box_get_attribute(c, "type", param,
&param->type) == false) {
dom_node_unref(c);
return false;
}
if (box_get_attribute(c, "valuetype", param,
&param->valuetype) == false) {
dom_node_unref(c);
return false;
}
if (param->valuetype == NULL) {
param->valuetype = talloc_strdup(param, "data");
if (param->valuetype == NULL) {
dom_node_unref(c);
return false;
}
}
param->next = params->params;
params->params = param;
}
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
dom_node_unref(c);
c = next;
}
box->object_params = params;
/* start fetch (MIME type is ok or not specified) */
if (!html_fetch_object(content,
params->data ? params->data : params->classid,
box, CONTENT_ANY, content->base.available_width, 1000,
false))
return false;
*convert_children = false;
return true;
}
/**
* Window subdivision [16.2.1].
*/
bool box_frameset(BOX_SPECIAL_PARAMS)
{
bool ok;
if (content->frameset) {
LOG(("Error: multiple framesets in document."));
/* Don't convert children */
if (convert_children)
*convert_children = false;
/* And ignore this spurious frameset */
box->type = BOX_NONE;
return true;
}
content->frameset = talloc_zero(content->bctx, struct content_html_frames);
if (!content->frameset)
return false;
ok = box_create_frameset(content->frameset, n, content);
if (ok)
box->type = BOX_NONE;
if (convert_children)
*convert_children = false;
return ok;
}
/**
* Destructor for content_html_frames, for frame elements
*
* \param f The frame params being destroyed.
* \return 0 to allow talloc to continue destroying the tree.
*/
static int box_frames_talloc_destructor(struct content_html_frames *f)
{
if (f->url != NULL) {
nsurl_unref(f->url);
f->url = NULL;
}
return 0;
}
bool box_create_frameset(struct content_html_frames *f, dom_node *n,
html_content *content) {
unsigned int row, col, index, i;
unsigned int rows = 1, cols = 1;
dom_string *s;
dom_exception err;
nsurl *url;
struct frame_dimension *row_height = 0, *col_width = 0;
dom_node *c, *next;
struct content_html_frames *frame;
bool default_border = true;
colour default_border_colour = 0x000000;
/* parse rows and columns */
err = dom_element_get_attribute(n, corestring_dom_rows, &s);
if (err == DOM_NO_ERR && s != NULL) {
row_height = box_parse_multi_lengths(dom_string_data(s), &rows);
dom_string_unref(s);
if (row_height == NULL)
return false;
} else {
row_height = calloc(1, sizeof(struct frame_dimension));
if (row_height == NULL)
return false;
row_height->value = 100;
row_height->unit = FRAME_DIMENSION_PERCENT;
}
err = dom_element_get_attribute(n, corestring_dom_cols, &s);
if (err == DOM_NO_ERR && s != NULL) {
col_width = box_parse_multi_lengths(dom_string_data(s), &cols);
dom_string_unref(s);
if (col_width == NULL) {
free(row_height);
return false;
}
} else {
col_width = calloc(1, sizeof(struct frame_dimension));
if (col_width == NULL) {
free(row_height);
return false;
}
col_width->value = 100;
col_width->unit = FRAME_DIMENSION_PERCENT;
}
/* common extension: border="0|1" to control all children */
err = dom_element_get_attribute(n, corestring_dom_border, &s);
if (err == DOM_NO_ERR && s != NULL) {
if ((dom_string_data(s)[0] == '0') &&
(dom_string_data(s)[1] == '\0'))
default_border = false;
dom_string_unref(s);
}
/* common extension: frameborder="yes|no" to control all children */
err = dom_element_get_attribute(n, corestring_dom_frameborder, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_no) == 0)
default_border = false;
dom_string_unref(s);
}
/* common extension: bordercolor="#RRGGBB|<named colour>" to control
*all children */
err = dom_element_get_attribute(n, corestring_dom_bordercolor, &s);
if (err == DOM_NO_ERR && s != NULL) {
css_color color;
if (nscss_parse_colour(dom_string_data(s), &color))
default_border_colour = nscss_color_to_ns(color);
dom_string_unref(s);
}
/* update frameset and create default children */
f->cols = cols;
f->rows = rows;
f->scrolling = BW_SCROLLING_NO;
f->children = talloc_array(content->bctx, struct content_html_frames,
(rows * cols));
talloc_set_destructor(f->children, box_frames_talloc_destructor);
for (row = 0; row < rows; row++) {
for (col = 0; col < cols; col++) {
index = (row * cols) + col;
frame = &f->children[index];
frame->cols = 0;
frame->rows = 0;
frame->width = col_width[col];
frame->height = row_height[row];
frame->margin_width = 0;
frame->margin_height = 0;
frame->name = NULL;
frame->url = NULL;
frame->no_resize = false;
frame->scrolling = BW_SCROLLING_AUTO;
frame->border = default_border;
frame->border_colour = default_border_colour;
frame->children = NULL;
}
}
free(col_width);
free(row_height);
/* create the frameset windows */
err = dom_node_get_first_child(n, &c);
if (err != DOM_NO_ERR)
return false;
for (row = 0; c != NULL && row < rows; row++) {
for (col = 0; c != NULL && col < cols; col++) {
while (c != NULL) {
dom_node_type type;
dom_string *name;
err = dom_node_get_node_type(c, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
err = dom_node_get_node_name(c, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (type != DOM_ELEMENT_NODE ||
(!dom_string_caseless_lwc_isequal(
name,
corestring_lwc_frame) &&
!dom_string_caseless_lwc_isequal(
name,
corestring_lwc_frameset
))) {
err = dom_node_get_next_sibling(c,
&next);
if (err != DOM_NO_ERR) {
dom_string_unref(name);
dom_node_unref(c);
return false;
}
dom_string_unref(name);
dom_node_unref(c);
c = next;
} else {
/* Got a FRAME or FRAMESET element */
dom_string_unref(name);
break;
}
}
if (c == NULL)
break;
/* get current frame */
index = (row * cols) + col;
frame = &f->children[index];
/* nest framesets */
err = dom_node_get_node_name(c, &s);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_frameset)) {
dom_string_unref(s);
frame->border = 0;
if (box_create_frameset(frame, c,
content) == false) {
dom_node_unref(c);
return false;
}
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
dom_node_unref(c);
c = next;
continue;
}
dom_string_unref(s);
/* get frame URL (not required) */
url = NULL;
err = dom_element_get_attribute(c, corestring_dom_src, &s);
if (err == DOM_NO_ERR && s != NULL) {
box_extract_link(dom_string_data(s),
content->base_url, &url);
dom_string_unref(s);
}
/* copy url */
if (url != NULL) {
/* no self-references */
if (nsurl_compare(content->base_url, url,
NSURL_COMPLETE) == false)
frame->url = url;
url = NULL;
}
/* fill in specified values */
err = dom_element_get_attribute(c, corestring_dom_name, &s);
if (err == DOM_NO_ERR && s != NULL) {
frame->name = talloc_strdup(content->bctx,
dom_string_data(s));
dom_string_unref(s);
}
dom_element_has_attribute(c, corestring_dom_noresize,
&frame->no_resize);
err = dom_element_get_attribute(c, corestring_dom_frameborder,
&s);
if (err == DOM_NO_ERR && s != NULL) {
i = atoi(dom_string_data(s));
frame->border = (i != 0);
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_scrolling, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_yes))
frame->scrolling = BW_SCROLLING_YES;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_no))
frame->scrolling = BW_SCROLLING_NO;
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_marginwidth,
&s);
if (err == DOM_NO_ERR && s != NULL) {
frame->margin_width = atoi(dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_marginheight,
&s);
if (err == DOM_NO_ERR && s != NULL) {
frame->margin_height = atoi(dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_bordercolor,
&s);
if (err == DOM_NO_ERR && s != NULL) {
css_color color;
if (nscss_parse_colour(dom_string_data(s),
&color))
frame->border_colour =
nscss_color_to_ns(color);
dom_string_unref(s);
}
/* advance */
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
dom_node_unref(c);
c = next;
}
}
return true;
}
/**
* Destructor for content_html_iframe, for &lt;iframe&gt; elements
*
* \param f The iframe params being destroyed.
* \return 0 to allow talloc to continue destroying the tree.
*/
static int box_iframes_talloc_destructor(struct content_html_iframe *f)
{
if (f->url != NULL) {
nsurl_unref(f->url);
f->url = NULL;
}
return 0;
}
/**
* Inline subwindow [16.5].
*/
bool box_iframe(BOX_SPECIAL_PARAMS)
{
nsurl *url;
dom_string *s;
dom_exception err;
struct content_html_iframe *iframe;
int i;
if (box->style && css_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
if (box->style && css_computed_visibility(box->style) ==
CSS_VISIBILITY_HIDDEN)
/* Don't create iframe discriptors for invisible iframes
* TODO: handle hidden iframes at browser_window generation
* time instead? */
return true;
/* get frame URL */
err = dom_element_get_attribute(n, corestring_dom_src, &s);
if (err != DOM_NO_ERR || s == NULL)
return true;
if (box_extract_link(dom_string_data(s), content->base_url,
&url) == false) {
dom_string_unref(s);
return false;
}
dom_string_unref(s);
if (url == NULL)
return true;
/* don't include ourself */
if (nsurl_compare(content->base_url, url, NSURL_COMPLETE)) {
nsurl_unref(url);
return true;
}
/* create a new iframe */
iframe = talloc(content->bctx, struct content_html_iframe);
if (iframe == NULL) {
nsurl_unref(url);
return false;
}
talloc_set_destructor(iframe, box_iframes_talloc_destructor);
iframe->box = box;
iframe->margin_width = 0;
iframe->margin_height = 0;
iframe->name = NULL;
iframe->url = url;
iframe->scrolling = BW_SCROLLING_AUTO;
iframe->border = true;
/* Add this iframe to the linked list of iframes */
iframe->next = content->iframe;
content->iframe = iframe;
/* fill in specified values */
err = dom_element_get_attribute(n, corestring_dom_name, &s);
if (err == DOM_NO_ERR && s != NULL) {
iframe->name = talloc_strdup(content->bctx, dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_frameborder, &s);
if (err == DOM_NO_ERR && s != NULL) {
i = atoi(dom_string_data(s));
iframe->border = (i != 0);
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_bordercolor, &s);
if (err == DOM_NO_ERR && s != NULL) {
css_color color;
if (nscss_parse_colour(dom_string_data(s), &color))
iframe->border_colour = nscss_color_to_ns(color);
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_scrolling, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_yes))
iframe->scrolling = BW_SCROLLING_YES;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_no))
iframe->scrolling = BW_SCROLLING_NO;
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_marginwidth, &s);
if (err == DOM_NO_ERR && s != NULL) {
iframe->margin_width = atoi(dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_marginheight, &s);
if (err == DOM_NO_ERR && s != NULL) {
iframe->margin_height = atoi(dom_string_data(s));
dom_string_unref(s);
}
/* box */
assert(box->style);
box->flags |= IFRAME;
/* Showing iframe, so don't show alternate content */
if (convert_children)
*convert_children = false;
return true;
}
/**
* Helper function for adding textarea widget to box.
*
* This is a load of hacks to ensure boxes replaced with textareas
* can be handled by the layout code.
*/
static bool box_input_text(html_content *html, struct box *box,
struct dom_node *node)
{
struct box *inline_container, *inline_box;
box->type = BOX_INLINE_BLOCK;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0, html->bctx);
if (!inline_container)
return false;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0, box->title, 0,
html->bctx);
if (!inline_box)
return false;
inline_box->type = BOX_TEXT;
inline_box->text = talloc_strdup(html->bctx, "");
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
return box_textarea_create_textarea(html, box, node);
}
/**
* Form control [17.4].
*/
bool box_input(BOX_SPECIAL_PARAMS)
{
struct form_control *gadget = NULL;
dom_string *type = NULL;
dom_exception err;
nsurl *url;
nserror error;
dom_element_get_attribute(n, corestring_dom_type, &type);
gadget = html_forms_get_control_for_node(content->forms, n);
if (gadget == NULL)
goto no_memory;
box->gadget = gadget;
gadget->box = box;
gadget->html = content;
if (type && dom_string_caseless_lwc_isequal(type,
corestring_lwc_password)) {
if (box_input_text(content, box, n) == false)
goto no_memory;
} else if (type && dom_string_caseless_lwc_isequal(type,
corestring_lwc_file)) {
box->type = BOX_INLINE_BLOCK;
} else if (type && dom_string_caseless_lwc_isequal(type,
corestring_lwc_hidden)) {
/* no box for hidden inputs */
box->type = BOX_NONE;
} else if (type &&
(dom_string_caseless_lwc_isequal(type,
corestring_lwc_checkbox) ||
dom_string_caseless_lwc_isequal(type,
corestring_lwc_radio))) {
} else if (type &&
(dom_string_caseless_lwc_isequal(type,
corestring_lwc_submit) ||
dom_string_caseless_lwc_isequal(type,
corestring_lwc_reset) ||
dom_string_caseless_lwc_isequal(type,
corestring_lwc_button))) {
struct box *inline_container, *inline_box;
if (box_button(n, content, box, 0) == false)
goto no_memory;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0,
content->bctx);
if (inline_container == NULL)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0,
box->title, 0, content->bctx);
if (inline_box == NULL)
goto no_memory;
inline_box->type = BOX_TEXT;
if (box->gadget->value != NULL)
inline_box->text = talloc_strdup(content->bctx,
box->gadget->value);
else if (box->gadget->type == GADGET_SUBMIT)
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_Submit"));
else if (box->gadget->type == GADGET_RESET)
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_Reset"));
else
inline_box->text = talloc_strdup(content->bctx,
"Button");
if (inline_box->text == NULL)
goto no_memory;
inline_box->length = strlen(inline_box->text);
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
} else if (type && dom_string_caseless_lwc_isequal(type,
corestring_lwc_image)) {
gadget->type = GADGET_IMAGE;
if (box->style && css_computed_display(box->style,
box_is_root(n)) != CSS_DISPLAY_NONE &&
nsoption_bool(foreground_images) == true) {
dom_string *s;
err = dom_element_get_attribute(n, corestring_dom_src, &s);
if (err == DOM_NO_ERR && s != NULL) {
error = nsurl_join(content->base_url,
dom_string_data(s), &url);
dom_string_unref(s);
if (error != NSERROR_OK)
goto no_memory;
/* if url is equivalent to the parent's url,
* we've got infinite inclusion. stop it here
*/
if (nsurl_compare(url, content->base_url,
NSURL_COMPLETE) == false) {
if (!html_fetch_object(content, url,
box, image_types,
content->base.
available_width,
1000, false)) {
nsurl_unref(url);
goto no_memory;
}
}
nsurl_unref(url);
}
}
} else {
/* the default type is "text" */
if (box_input_text(content, box, n) == false)
goto no_memory;
}
if (type)
dom_string_unref(type);
*convert_children = false;
return true;
no_memory:
if (type)
dom_string_unref(type);
return false;
}
/**
* Push button [17.5].
*/
bool box_button(BOX_SPECIAL_PARAMS)
{
struct form_control *gadget;
gadget = html_forms_get_control_for_node(content->forms, n);
if (!gadget)
return false;
gadget->html = content;
box->gadget = gadget;
gadget->box = box;
box->type = BOX_INLINE_BLOCK;
/* Just render the contents */
return true;
}
/**
* Option selector [17.6].
*/
bool box_select(BOX_SPECIAL_PARAMS)
{
struct box *inline_container;
struct box *inline_box;
struct form_control *gadget;
dom_node *c, *c2;
dom_node *next, *next2;
dom_exception err;
gadget = html_forms_get_control_for_node(content->forms, n);
if (gadget == NULL)
return false;
gadget->html = content;
err = dom_node_get_first_child(n, &c);
if (err != DOM_NO_ERR) {
form_free_control(gadget);
return false;
}
while (c != NULL) {
dom_string *name;
err = dom_node_get_node_name(c, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_option)) {
dom_string_unref(name);
if (box_select_add_option(gadget, c) == false) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_optgroup)) {
dom_string_unref(name);
err = dom_node_get_first_child(c, &c2);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
while (c2 != NULL) {
dom_string *c2_name;
err = dom_node_get_node_name(c2, &c2_name);
if (err != DOM_NO_ERR) {
dom_node_unref(c2);
dom_node_unref(c);
return false;
}
if (dom_string_caseless_lwc_isequal(c2_name,
corestring_lwc_option)) {
dom_string_unref(c2_name);
if (box_select_add_option(gadget,
c2) == false) {
dom_node_unref(c2);
dom_node_unref(c);
return false;
}
} else {
dom_string_unref(c2_name);
}
err = dom_node_get_next_sibling(c2, &next2);
if (err != DOM_NO_ERR) {
dom_node_unref(c2);
dom_node_unref(c);
return false;
}
dom_node_unref(c2);
c2 = next2;
}
} else {
dom_string_unref(name);
}
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
dom_node_unref(c);
c = next;
}
if (gadget->data.select.num_items == 0) {
/* no options: ignore entire select */
form_free_control(gadget);
return true;
}
box->type = BOX_INLINE_BLOCK;
box->gadget = gadget;
gadget->box = box;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0, content->bctx);
if (inline_container == NULL)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0, box->title, 0,
content->bctx);
if (inline_box == NULL)
goto no_memory;
inline_box->type = BOX_TEXT;
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
if (gadget->data.select.multiple == false &&
gadget->data.select.num_selected == 0) {
gadget->data.select.current = gadget->data.select.items;
gadget->data.select.current->initial_selected =
gadget->data.select.current->selected = true;
gadget->data.select.num_selected = 1;
dom_html_option_element_set_selected(
gadget->data.select.current->node, true);
}
if (gadget->data.select.num_selected == 0)
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_None"));
else if (gadget->data.select.num_selected == 1)
inline_box->text = talloc_strdup(content->bctx,
gadget->data.select.current->text);
else
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_Many"));
if (inline_box->text == NULL)
goto no_memory;
inline_box->length = strlen(inline_box->text);
*convert_children = false;
return true;
no_memory:
return false;
}
/**
* Add an option to a form select control (helper function for box_select()).
*
* \param control select containing the &lt;option&gt;
* \param n xml element node for &lt;option&gt;
* \return true on success, false on memory exhaustion
*/
bool box_select_add_option(struct form_control *control, dom_node *n)
{
char *value = NULL;
char *text = NULL;
char *text_nowrap = NULL;
bool selected;
dom_string *content, *s;
dom_exception err;
err = dom_node_get_text_content(n, &content);
if (err != DOM_NO_ERR)
return false;
if (content != NULL) {
text = squash_whitespace(dom_string_data(content));
dom_string_unref(content);
} else {
text = strdup("");
}
if (text == NULL)
goto no_memory;
err = dom_element_get_attribute(n, corestring_dom_value, &s);
if (err == DOM_NO_ERR && s != NULL) {
value = strdup(dom_string_data(s));
dom_string_unref(s);
} else {
value = strdup(text);
}
if (value == NULL)
goto no_memory;
dom_element_has_attribute(n, corestring_dom_selected, &selected);
/* replace spaces/TABs with hard spaces to prevent line wrapping */
text_nowrap = cnv_space2nbsp(text);
if (text_nowrap == NULL)
goto no_memory;
if (form_add_option(control, value, text_nowrap, selected, n) == false)
goto no_memory;
free(text);
return true;
no_memory:
free(value);
free(text);
free(text_nowrap);
return false;
}
/**
* Multi-line text field [17.7].
*/
bool box_textarea(BOX_SPECIAL_PARAMS)
{
/* Get the form_control for the DOM node */
box->gadget = html_forms_get_control_for_node(content->forms, n);
if (box->gadget == NULL)
return false;
box->gadget->html = content;
box->gadget->box = box;
if (!box_input_text(content, box, n))
return false;
*convert_children = false;
return true;
}
/**
* Embedded object (not in any HTML specification:
* see http://wp.netscape.com/assist/net_sites/new_html3_prop.html )
*/
bool box_embed(BOX_SPECIAL_PARAMS)
{
struct object_params *params;
struct object_param *param;
dom_namednodemap *attrs;
unsigned long idx;
uint32_t num_attrs;
dom_string *src;
dom_exception err;
if (box->style && css_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
params = talloc(content->bctx, struct object_params);
if (params == NULL)
return false;
talloc_set_destructor(params, box_object_talloc_destructor);
params->data = NULL;
params->type = NULL;
params->codetype = NULL;
params->codebase = NULL;
params->classid = NULL;
params->params = NULL;
/* src is a URL */
err = dom_element_get_attribute(n, corestring_dom_src, &src);
if (err != DOM_NO_ERR || src == NULL)
return true;
if (box_extract_link(dom_string_data(src), content->base_url,
&params->data) == false) {
dom_string_unref(src);
return false;
}
dom_string_unref(src);
if (params->data == NULL)
return true;
/* Don't include ourself */
if (nsurl_compare(content->base_url, params->data, NSURL_COMPLETE))
return true;
/* add attributes as parameters to linked list */
err = dom_node_get_attributes(n, &attrs);
if (err != DOM_NO_ERR)
return false;
err = dom_namednodemap_get_length(attrs, &num_attrs);
if (err != DOM_NO_ERR) {
dom_namednodemap_unref(attrs);
return false;
}
for (idx = 0; idx < num_attrs; idx++) {
dom_attr *attr;
dom_string *name, *value;
err = dom_namednodemap_item(attrs, idx, (void *) &attr);
if (err != DOM_NO_ERR) {
dom_namednodemap_unref(attrs);
return false;
}
err = dom_attr_get_name(attr, &name);
if (err != DOM_NO_ERR) {
dom_namednodemap_unref(attrs);
return false;
}
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_src)) {
dom_string_unref(name);
continue;
}
err = dom_attr_get_value(attr, &value);
if (err != DOM_NO_ERR) {
dom_string_unref(name);
dom_namednodemap_unref(attrs);
return false;
}
param = talloc(content->bctx, struct object_param);
if (param == NULL) {
dom_string_unref(value);
dom_string_unref(name);
dom_namednodemap_unref(attrs);
return false;
}
param->name = talloc_strdup(content->bctx, dom_string_data(name));
param->value = talloc_strdup(content->bctx, dom_string_data(value));
param->type = NULL;
param->valuetype = talloc_strdup(content->bctx, "data");
param->next = NULL;
dom_string_unref(value);
dom_string_unref(name);
if (param->name == NULL || param->value == NULL ||
param->valuetype == NULL) {
dom_namednodemap_unref(attrs);
return false;
}
param->next = params->params;
params->params = param;
}
dom_namednodemap_unref(attrs);
box->object_params = params;
/* start fetch */
return html_fetch_object(content, params->data, box, CONTENT_ANY,
content->base.available_width, 1000, false);
}
/**
* \}
*/
/**
* Get the value of an XML element's attribute.
*
* \param n xmlNode, of type XML_ELEMENT_NODE
* \param attribute name of attribute
* \param context talloc context for result buffer
* \param value updated to value, if the attribute is present
* \return true on success, false if attribute present but memory exhausted
*
* Note that returning true does not imply that the attribute was found. If the
* attribute was not found, *value will be unchanged.
*/
bool box_get_attribute(dom_node *n, const char *attribute,
void *context, char **value)
{
char *result;
dom_string *attr, *attr_name;
dom_exception err;
err = dom_string_create_interned((const uint8_t *) attribute,
strlen(attribute), &attr_name);
if (err != DOM_NO_ERR)
return false;
err = dom_element_get_attribute(n, attr_name, &attr);
if (err != DOM_NO_ERR) {
dom_string_unref(attr_name);
return false;
}
dom_string_unref(attr_name);
if (attr != NULL) {
result = talloc_strdup(context, dom_string_data(attr));
dom_string_unref(attr);
if (result == NULL)
return false;
*value = result;
}
return true;
}
/**
* Extract a URL from a relative link, handling junk like whitespace and
* attempting to read a real URL from "javascript:" links.
*
* \param rel relative URL taken from page
* \param base base for relative URLs
* \param result updated to target URL on heap, unchanged if extract failed
* \return true on success, false on memory exhaustion
*/
bool box_extract_link(const char *rel, nsurl *base, nsurl **result)
{
char *s, *s1, *apos0 = 0, *apos1 = 0, *quot0 = 0, *quot1 = 0;
unsigned int i, j, end;
nserror error;
s1 = s = malloc(3 * strlen(rel) + 1);
if (!s)
return false;
/* copy to s, removing white space and control characters */
for (i = 0; rel[i] && isspace(rel[i]); i++)
;
for (end = strlen(rel); end != i && isspace(rel[end - 1]); end--)
;
for (j = 0; i != end; i++) {
if ((unsigned char) rel[i] < 0x20) {
; /* skip control characters */
} else if (rel[i] == ' ') {
s[j++] = '%';
s[j++] = '2';
s[j++] = '0';
} else {
s[j++] = rel[i];
}
}
s[j] = 0;
if (nsoption_bool(enable_javascript) == false) {
/* extract first quoted string out of "javascript:" link */
if (strncmp(s, "javascript:", 11) == 0) {
apos0 = strchr(s, '\'');
if (apos0)
apos1 = strchr(apos0 + 1, '\'');
quot0 = strchr(s, '"');
if (quot0)
quot1 = strchr(quot0 + 1, '"');
if (apos0 && apos1 &&
(!quot0 || !quot1 || apos0 < quot0)) {
*apos1 = 0;
s1 = apos0 + 1;
} else if (quot0 && quot1) {
*quot1 = 0;
s1 = quot0 + 1;
}
}
}
/* construct absolute URL */
error = nsurl_join(base, s1, result);
free(s);
if (error != NSERROR_OK) {
*result = NULL;
return false;
}
return true;
}
/**
* Parse a multi-length-list, as defined by HTML 4.01.
*
* \param s string to parse
* \param count updated to number of entries
* \return array of struct box_multi_length, or 0 on memory exhaustion
*/
struct frame_dimension *box_parse_multi_lengths(const char *s,
unsigned int *count)
{
char *end;
unsigned int i, n;
struct frame_dimension *length;
for (i = 0, n = 1; s[i]; i++)
if (s[i] == ',')
n++;
length = calloc(n, sizeof(struct frame_dimension));
if (!length)
return NULL;
for (i = 0; i != n; i++) {
while (isspace(*s))
s++;
length[i].value = strtof(s, &end);
if (length[i].value <= 0)
length[i].value = 1;
s = end;
switch (*s) {
case '%':
length[i].unit = FRAME_DIMENSION_PERCENT;
break;
case '*':
length[i].unit = FRAME_DIMENSION_RELATIVE;
break;
default:
length[i].unit = FRAME_DIMENSION_PIXELS;
break;
}
while (*s && *s != ',')
s++;
if (*s == ',')
s++;
}
*count = n;
return length;
}
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