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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 <libxml/HTMLparser.h>
#include <libxml/parserInternals.h>
#include "utils/config.h"
#include "content/content_protected.h"
#include "css/css.h"
#include "css/utils.h"
#include "css/select.h"
#include "desktop/options.h"
#include "render/box.h"
#include "render/form.h"
#include "render/html_internal.h"
#include "utils/locale.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/schedule.h"
#include "utils/talloc.h"
#include "utils/url.h"
#include "utils/utils.h"
/**
* Context for box tree construction
*/
struct box_construct_ctx {
html_content *content; /**< Content we're constructing for */
xmlNode *n; /**< Current node to process */
struct box *root_box; /**< Root box in the tree */
box_construct_complete_cb cb; /**< Callback to invoke on completion */
};
/**
* 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(xmlNode *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, xmlNode *n);
static void box_text_transform(char *s, unsigned int len,
enum css_text_transform_e tt);
#define BOX_SPECIAL_PARAMS xmlNode *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_input_text(BOX_SPECIAL_PARAMS, bool password);
static bool box_button(BOX_SPECIAL_PARAMS);
static bool box_frameset(BOX_SPECIAL_PARAMS);
static bool box_create_frameset(struct content_html_frames *f, xmlNode *n,
html_content *content);
static bool box_select_add_option(struct form_control *control, xmlNode *n);
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(xmlNode *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},
{"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 true on success, false on memory exhaustion
*/
bool xml_to_box(xmlNode *n, html_content *c, box_construct_complete_cb cb)
{
struct box_construct_ctx *ctx;
ctx = malloc(sizeof(*ctx));
if (ctx == NULL)
return false;
ctx->content = c;
ctx->n = n;
ctx->root_box = NULL;
ctx->cb = cb;
schedule(0, (schedule_callback_fn) convert_xml_to_box, ctx);
return true;
}
/* 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(const xmlNode *n)
{
return ((binding_private *) n->_private)->box;
}
static inline bool box_is_root(const xmlNode *n)
{
return n->parent == NULL || n->parent->type == XML_HTML_DOCUMENT_NODE;
}
/**
* 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
*/
static xmlNode *next_node(xmlNode *n, html_content *content,
bool convert_children)
{
xmlNode *next = NULL;
if (convert_children && n->children != NULL) {
next = n->children;
} else if (n->next != NULL) {
if (box_for_node(n) != NULL)
box_construct_element_after(n, content);
next = n->next;
} else {
if (box_for_node(n) != NULL)
box_construct_element_after(n, content);
while (box_is_root(n) == false && n->parent->next == NULL) {
n = n->parent;
if (box_for_node(n) != NULL)
box_construct_element_after(n, content);
}
if (box_is_root(n) == false) {
if (box_for_node(n->parent) != NULL) {
box_construct_element_after(n->parent, content);
}
next = n->parent->next;
}
}
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)
{
xmlNode *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);
assert(ctx->n->type == XML_ELEMENT_NODE);
if (box_construct_element(ctx, &convert_children) == false) {
ctx->cb(ctx->content, false);
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 && next->type != XML_ELEMENT_NODE) {
if (next->type == XML_TEXT_NODE) {
ctx->n = next;
if (box_construct_text(ctx) == false) {
ctx->cb(ctx->content, false);
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);
}
free(ctx);
return;
}
} while (++num_processed < max_processed_before_yield);
/* More work to do: schedule a continuation */
schedule(0, (schedule_callback_fn) convert_xml_to_box, ctx);
}
/**
* Construct a list marker box
*
* \param box Box to attach marker to
* \param title Current title attribute
* \param content Containing content
* \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,
html_content *content, struct box *parent)
{
lwc_string *image_uri;
struct box *marker;
marker = box_create(NULL, box->style, false, NULL, NULL, title,
NULL, content);
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) {
if (last->list_marker != NULL)
break;
last = last->last;
}
if (last && last->list_marker) {
marker->rows = last->list_marker->rows + 1;
}
}
marker->text = talloc_array(content, 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) {
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(content, url, marker, image_types,
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(xmlNode *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);
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(const xmlNode *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) {
struct box *parent_box;
/* Find ancestor node containing parent box */
while (n->parent != NULL && box_for_node(n->parent) == NULL)
n = n->parent;
parent_box = box_for_node(n->parent);
props->parent_style = parent_box->style;
props->href = parent_box->href;
props->target = parent_box->target;
props->title = parent_box->title;
/* Find containing block (may be parent) */
for (n = n->parent; n != NULL; n = n->parent) {
struct box *b = box_for_node(n);
/* 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;
break;
}
}
}
/* 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)
{
xmlChar *title0, *s;
lwc_string *id = NULL;
struct box *box = NULL;
css_select_results *styles = NULL;
struct element_entry *element;
lwc_string *bgimage_uri;
struct box_construct_props props;
assert(ctx->n != NULL);
assert(ctx->n->type == XML_ELEMENT_NODE);
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 */
if ((title0 = xmlGetProp(ctx->n, (const xmlChar *) "title")) != NULL) {
char *t = squash_whitespace((char *) title0);
xmlFree(title0);
if (t == NULL)
return false;
props.title = talloc_strdup(ctx->content, t);
free(t);
if (props.title == NULL)
return false;
}
/* Extract id attribute, if present */
s = xmlGetProp(ctx->n, (const xmlChar *) "id");
if (s) {
lwc_error lerror = lwc_intern_string((const char *) s,
strlen((const char *) s), &id);
xmlFree(s);
if (lerror != lwc_error_ok)
id = NULL;
}
box = box_create(styles, styles->styles[CSS_PSEUDO_ELEMENT_NONE], false,
props.href, props.target, props.title, id,
ctx->content);
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 */
if ((s = xmlGetProp(ctx->n, (const xmlChar *) "colspan")) != NULL) {
if ('0' <= s[0] && s[0] <= '9')
box->columns = strtol((char *) s, NULL, 10);
xmlFree(s);
}
if ((s = xmlGetProp(ctx->n, (const xmlChar *) "rowspan")) != NULL) {
if ('0' <= s[0] && s[0] <= '9')
box->rows = strtol((char *) s, NULL, 10);
xmlFree(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 {
/* 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]);
/* Special elements */
element = bsearch((const char *) ctx->n->name, element_table,
ELEMENT_TABLE_COUNT, sizeof(element_table[0]),
(int (*)(const void *, const void *)) strcmp);
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) {
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 box to DOM node */
((binding_private *) ctx->n->_private)->box = box;
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)) {
/* 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 &&
"Root box must not be inline or floated");
props.inline_container = box_create(NULL, NULL, false, NULL,
NULL, NULL, NULL, ctx->content);
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) {
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)
return false;
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->content,
props.containing_block) == false)
return false;
}
if (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->content);
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(xmlNode *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;
if (n->children == NULL ||
(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);
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);
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;
assert(ctx->n != NULL);
assert(ctx->n->type == XML_TEXT_NODE);
box_extract_properties(ctx->n, &props);
assert(props.containing_block != NULL);
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 = squash_whitespace((char *) ctx->n->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->content);
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->content);
if (box == NULL) {
free(text);
return false;
}
box->type = BOX_TEXT;
box->text = talloc_strdup(ctx->content, 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));
if (css_computed_white_space(props.parent_style) ==
CSS_WHITE_SPACE_NOWRAP) {
unsigned int i;
for (i = 0; i != box->length &&
box->text[i] != ' '; ++i)
; /* no body */
if (i != box->length) {
/* there is a space in text block and we
* want all spaces to be converted to NBSP
*/
/*box->text = cnv_space2nbsp(text);
if (!box->text) {
free(text);
goto no_memory;
}
box->length = strlen(box->text);*/
}
}
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 = cnv_space2nbsp((char *) ctx->n->content);
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);
if (text == NULL)
return false;
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->content);
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->content);
if (box == NULL) {
free(text);
return false;
}
box->type = BOX_TEXT;
box->text = talloc_strdup(ctx->content, 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->content);
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, xmlNode *n)
{
char *s;
int pseudo_element;
css_error error;
css_stylesheet *inline_style = NULL;
css_select_results *styles;
nscss_select_ctx ctx;
/* Firstly, construct inline stylesheet, if any */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "style"))) {
inline_style = nscss_create_inline_style(
(uint8_t *) s, strlen(s),
c->encoding,
nsurl_access(content_get_url(&c->base)),
c->quirks != BINDING_QUIRKS_MODE_NONE,
box_style_alloc, NULL);
xmlFree(s);
if (inline_style == NULL)
return NULL;
}
/* Populate selection context */
ctx.ctx = c->select_ctx;
ctx.quirks = (c->quirks == BINDING_QUIRKS_MODE_FULL);
ctx.base_url = c->base_url;
ctx.universal = c->universal;
/* Select partial style for element */
styles = nscss_get_style(&ctx, n, CSS_MEDIA_SCREEN, inline_style,
box_style_alloc, NULL);
/* No longer need inline style */
if (inline_style != NULL)
css_stylesheet_destroy(inline_style);
/* Failed selecting partial style -- bail out */
if (styles == NULL)
return NULL;
/* If there's a parent style, compose with partial to obtain
* complete computed style for element */
if (parent_style != NULL) {
/* Complete the computed style, by composing with the parent
* element's style */
error = css_computed_style_compose(parent_style,
styles->styles[CSS_PSEUDO_ELEMENT_NONE],
nscss_compute_font_size, NULL,
styles->styles[CSS_PSEUDO_ELEMENT_NONE]);
if (error != CSS_OK) {
css_select_results_destroy(styles);
return NULL;
}
}
for (pseudo_element = CSS_PSEUDO_ELEMENT_NONE + 1;
pseudo_element < CSS_PSEUDO_ELEMENT_COUNT;
pseudo_element++) {
if (pseudo_element == CSS_PSEUDO_ELEMENT_FIRST_LETTER ||
pseudo_element == CSS_PSEUDO_ELEMENT_FIRST_LINE)
/* TODO: Handle first-line and first-letter pseudo
* element computed style completion */
continue;
if (styles->styles[pseudo_element] == NULL)
/* There were no rules concerning this pseudo element */
continue;
/* Complete the pseudo element's computed style, by composing
* with the base element's style */
error = css_computed_style_compose(
styles->styles[CSS_PSEUDO_ELEMENT_NONE],
styles->styles[pseudo_element],
nscss_compute_font_size, NULL,
styles->styles[pseudo_element]);
if (error != CSS_OK) {
/* TODO: perhaps this shouldn't be quite so
* catastrophic? */
css_select_results_destroy(styles);
return NULL;
}
}
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;
xmlChar *s;
if ((s = xmlGetProp(n, (const xmlChar *) "href"))) {
ok = box_extract_link((const char *) s,
content->base_url, &url);
xmlFree(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 */
s = xmlGetProp(n, (const xmlChar *) "name");
if (s) {
lwc_error lerror;
lwc_string *lwc_name;
lerror = lwc_intern_string((const char *) s,
strlen((const char *) s), &lwc_name);
xmlFree(s);
if (lerror == lwc_error_ok) {
/* name replaces existing id
* TODO: really? */
if (box->id != NULL)
lwc_string_unref(box->id);
box->id = lwc_name;
}
}
/* target frame [16.3] */
if ((s = xmlGetProp(n, (const xmlChar *) "target"))) {
if (!strcasecmp((const char *) s, "_blank"))
box->target = TARGET_BLANK;
else if (!strcasecmp((const char *) s, "_top"))
box->target = TARGET_TOP;
else if (!strcasecmp((const char *) s, "_parent"))
box->target = TARGET_PARENT;
else if (!strcasecmp((const char *) s, "_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, (const char *) s);
if (!box->target) {
xmlFree(s);
return false;
}
}
xmlFree(s);
}
return true;
}
/**
* Embedded image [13.2].
*/
bool box_image(BOX_SPECIAL_PARAMS)
{
bool ok;
char *s;
nsurl *url;
xmlChar *alt, *src;
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,
n->parent == NULL) == CSS_DISPLAY_NONE)
return true;
/* handle alt text */
if ((alt = xmlGetProp(n, (const xmlChar *) "alt"))) {
s = squash_whitespace((const char *) alt);
xmlFree(alt);
if (!s)
return false;
box->text = talloc_strdup(content, s);
free(s);
if (!box->text)
return false;
box->length = strlen(box->text);
}
/* imagemap associated with this image */
if (!box_get_attribute(n, "usemap", content, &box->usemap))
return false;
if (box->usemap && box->usemap[0] == '#')
box->usemap++;
/* get image URL */
if (!(src = xmlGetProp(n, (const xmlChar *) "src")))
return true;
if (!box_extract_link((char *) src, content->base_url, &url))
return false;
xmlFree(src);
if (!url)
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;
}
/**
* Destructor for object_params, for <object> elements
*
* \param b 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;
xmlChar *codebase, *classid, *data;
xmlNode *c;
if (box->style && css_computed_display(box->style,
n->parent == NULL) == CSS_DISPLAY_NONE)
return true;
if (!box_get_attribute(n, "usemap", content, &box->usemap))
return false;
if (box->usemap && box->usemap[0] == '#')
box->usemap++;
params = talloc(content, struct object_params);
if (!params)
return false;
talloc_set_destructor(params, box_object_talloc_destructor);
params->data = 0;
params->type = 0;
params->codetype = 0;
params->codebase = 0;
params->classid = 0;
params->params = 0;
/* codebase, classid, and data are URLs
* (codebase is the base for the other two) */
if ((codebase = xmlGetProp(n, (const xmlChar *) "codebase"))) {
if (!box_extract_link((char *) codebase, content->base_url,
&params->codebase))
return false;
xmlFree(codebase);
}
if (!params->codebase)
params->codebase = nsurl_ref(content->base_url);
if ((classid = xmlGetProp(n, (const xmlChar *) "classid"))) {
if (!box_extract_link((char *) classid, params->codebase,
&params->classid))
return false;
xmlFree(classid);
}
if ((data = xmlGetProp(n, (const xmlChar *) "data"))) {
if (!box_extract_link((char *) data, params->codebase,
&params->data))
return false;
xmlFree(data);
}
if (!params->classid && !params->data)
/* nothing to embed; ignore */
return true;
/* Don't include ourself */
if (params->classid && nsurl_compare(content->base_url,
params->classid, NSURL_COMPLETE))
return true;
if (params->data && 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))
return false;
if (!box_get_attribute(n, "type", params, &params->type))
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 */
for (c = n->children; c; c = c->next) {
if (c->type != XML_ELEMENT_NODE)
continue;
if (strcmp((const char *) c->name, "param") != 0)
/* The first non-param child is the start of the alt
* html. Therefore, we should break out of this loop. */
break;
param = talloc(params, struct object_param);
if (!param)
return false;
param->name = 0;
param->value = 0;
param->type = 0;
param->valuetype = 0;
param->next = 0;
if (!box_get_attribute(c, "name", param, &param->name))
return false;
if (!box_get_attribute(c, "value", param, &param->value))
return false;
if (!box_get_attribute(c, "type", param, &param->type))
return false;
if (!box_get_attribute(c, "valuetype", param,
&param->valuetype))
return false;
if (!param->valuetype) {
param->valuetype = talloc_strdup(param, "data");
if (!param->valuetype)
return false;
}
param->next = params->params;
params->params = param;
}
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, 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 b 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, xmlNode *n,
html_content *content) {
unsigned int row, col, index, i;
unsigned int rows = 1, cols = 1;
char *s;
nsurl *url;
struct frame_dimension *row_height = 0, *col_width = 0;
xmlNode *c;
struct content_html_frames *frame;
bool default_border = true;
colour default_border_colour = 0x000000;
/* parse rows and columns */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "rows"))) {
row_height = box_parse_multi_lengths(s, &rows);
xmlFree(s);
if (!row_height)
return false;
} else {
row_height = calloc(1, sizeof(struct frame_dimension));
if (!row_height)
return false;
row_height->value = 100;
row_height->unit = FRAME_DIMENSION_PERCENT;
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "cols"))) {
col_width = box_parse_multi_lengths(s, &cols);
xmlFree(s);
if (!col_width)
return false;
} else {
col_width = calloc(1, sizeof(struct frame_dimension));
if (!col_width)
return false;
col_width->value = 100;
col_width->unit = FRAME_DIMENSION_PERCENT;
}
/* common extension: border="0|1" to control all children */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "border"))) {
if ((s[0] == '0') && (s[1] == '\0'))
default_border = false;
xmlFree(s);
}
/* common extension: frameborder="yes|no" to control all children */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "frameborder"))) {
if (!strcasecmp(s, "no"))
default_border = false;
xmlFree(s);
}
/* common extension: bordercolor="#RRGGBB|<named colour>" to control
*all children */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "bordercolor"))) {
css_color color;
if (nscss_parse_colour((const char *) s, &color))
default_border_colour = nscss_color_to_ns(color);
xmlFree(s);
}
/* update frameset and create default children */
f->cols = cols;
f->rows = rows;
f->scrolling = SCROLLING_NO;
f->children = talloc_array(content, 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 = 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 */
c = n->children;
for (row = 0; c && row < rows; row++) {
for (col = 0; c && col < cols; col++) {
while (c && !(c->type == XML_ELEMENT_NODE && (
strcmp((const char *) c->name, "frame") == 0 ||
strcmp((const char *) c->name, "frameset") == 0
)))
c = c->next;
if (!c)
break;
/* get current frame */
index = (row * cols) + col;
frame = &f->children[index];
/* nest framesets */
if (strcmp((const char *) c->name, "frameset") == 0) {
frame->border = 0;
if (!box_create_frameset(frame, c, content))
return false;
c = c->next;
continue;
}
/* get frame URL (not required) */
url = NULL;
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "src"))) {
box_extract_link(s, content->base_url, &url);
xmlFree(s);
}
/* copy url */
if (url) {
/* no self-references */
if (nsurl_compare(content->base_url, url,
NSURL_COMPLETE) == false)
frame->url = url;
url = NULL;
}
/* fill in specified values */
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "name"))) {
frame->name = talloc_strdup(content, s);
xmlFree(s);
}
frame->no_resize = xmlHasProp(c,
(const xmlChar *) "noresize") != NULL;
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "frameborder"))) {
i = atoi(s);
frame->border = (i != 0);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "scrolling"))) {
if (!strcasecmp(s, "yes"))
frame->scrolling = SCROLLING_YES;
else if (!strcasecmp(s, "no"))
frame->scrolling = SCROLLING_NO;
xmlFree(s);
}
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "marginwidth"))) {
frame->margin_width = atoi(s);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "marginheight"))) {
frame->margin_height = atoi(s);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(c, (const xmlChar *)
"bordercolor"))) {
css_color color;
if (nscss_parse_colour((const char *) s,
&color))
frame->border_colour =
nscss_color_to_ns(color);
xmlFree(s);
}
/* advance */
c = c->next;
}
}
return true;
}
/**
* Destructor for content_html_iframe, for <iframe> elements
*
* \param b 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;
char *s;
struct content_html_iframe *iframe;
int i;
if (box->style && css_computed_display(box->style,
n->parent == NULL) == 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 */
if (!(s = (char *) xmlGetProp(n,
(const xmlChar *) "src")))
return true;
if (!box_extract_link(s, content->base_url, &url)) {
xmlFree(s);
return false;
}
xmlFree(s);
if (!url)
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, struct content_html_iframe);
if (!iframe) {
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 = 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 */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "name"))) {
iframe->name = talloc_strdup(content, s);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "frameborder"))) {
i = atoi(s);
iframe->border = (i != 0);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "bordercolor"))) {
css_color color;
if (nscss_parse_colour(s, &color))
iframe->border_colour = nscss_color_to_ns(color);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "scrolling"))) {
if (!strcasecmp(s, "yes"))
iframe->scrolling = SCROLLING_YES;
else if (!strcasecmp(s, "no"))
iframe->scrolling = SCROLLING_NO;
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "marginwidth"))) {
iframe->margin_width = atoi(s);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "marginheight"))) {
iframe->margin_height = atoi(s);
xmlFree(s);
}
/* box */
assert(box->style);
box->flags |= IFRAME;
/* Showing iframe, so don't show alternate content */
if (convert_children)
*convert_children = false;
return true;
}
/**
* Form control [17.4].
*/
bool box_input(BOX_SPECIAL_PARAMS)
{
struct form_control *gadget = NULL;
char *s, *type;
nsurl *url;
nserror error;
type = (char *) xmlGetProp(n, (const xmlChar *) "type");
gadget = binding_get_control_for_node(content->parser_binding, n);
if (!gadget)
goto no_memory;
box->gadget = gadget;
gadget->box = box;
if (type && strcasecmp(type, "password") == 0) {
if (!box_input_text(n, content, box, 0, true))
goto no_memory;
} else if (type && strcasecmp(type, "file") == 0) {
box->type = BOX_INLINE_BLOCK;
} else if (type && strcasecmp(type, "hidden") == 0) {
/* no box for hidden inputs */
box->type = BOX_NONE;
} else if (type && (strcasecmp(type, "checkbox") == 0 ||
strcasecmp(type, "radio") == 0)) {
} else if (type && (strcasecmp(type, "submit") == 0 ||
strcasecmp(type, "reset") == 0 ||
strcasecmp(type, "button") == 0)) {
struct box *inline_container, *inline_box;
if (!box_button(n, content, box, 0))
goto no_memory;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0,
content);
if (!inline_container)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0,
box->title, 0, content);
if (!inline_box)
goto no_memory;
inline_box->type = BOX_TEXT;
if (box->gadget->value != NULL)
inline_box->text = talloc_strdup(content,
box->gadget->value);
else if (box->gadget->type == GADGET_SUBMIT)
inline_box->text = talloc_strdup(content,
messages_get("Form_Submit"));
else if (box->gadget->type == GADGET_RESET)
inline_box->text = talloc_strdup(content,
messages_get("Form_Reset"));
else
inline_box->text = talloc_strdup(content, "Button");
if (!inline_box->text)
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 && strcasecmp(type, "image") == 0) {
gadget->type = GADGET_IMAGE;
if (box->style && css_computed_display(box->style,
n->parent == NULL) != CSS_DISPLAY_NONE) {
if ((s = (char *) xmlGetProp(n,
(const xmlChar*) "src"))) {
error = nsurl_join(content->base_url, s, &url);
xmlFree(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(n, content, box, 0, false))
goto no_memory;
}
if (type)
xmlFree(type);
*convert_children = false;
return true;
no_memory:
if (type)
xmlFree(type);
return false;
}
/**
* Helper function for box_input().
*/
bool box_input_text(BOX_SPECIAL_PARAMS, bool password)
{
struct box *inline_container, *inline_box;
box->type = BOX_INLINE_BLOCK;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0, content);
if (!inline_container)
return false;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0, box->title, 0,
content);
if (!inline_box)
return false;
inline_box->type = BOX_TEXT;
if (password) {
inline_box->length = strlen(box->gadget->value);
inline_box->text = talloc_array(content, char,
inline_box->length + 1);
if (!inline_box->text)
return false;
memset(inline_box->text, '*', inline_box->length);
inline_box->text[inline_box->length] = '\0';
} else {
/* replace spaces/TABs with hard spaces to prevent line
* wrapping */
char *text = cnv_space2nbsp(box->gadget->value);
if (!text)
return false;
inline_box->text = talloc_strdup(content, text);
free(text);
if (!inline_box->text)
return false;
inline_box->length = strlen(inline_box->text);
}
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
return true;
}
/**
* Push button [17.5].
*/
bool box_button(BOX_SPECIAL_PARAMS)
{
struct form_control *gadget;
gadget = binding_get_control_for_node(content->parser_binding, n);
if (!gadget)
return false;
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;
xmlNode *c, *c2;
gadget = binding_get_control_for_node(content->parser_binding, n);
if (!gadget)
return false;
for (c = n->children; c; c = c->next) {
if (strcmp((const char *) c->name, "option") == 0) {
if (!box_select_add_option(gadget, c))
goto no_memory;
} else if (strcmp((const char *) c->name, "optgroup") == 0) {
for (c2 = c->children; c2; c2 = c2->next) {
if (strcmp((const char *) c2->name,
"option") == 0) {
if (!box_select_add_option(gadget, c2))
goto no_memory;
}
}
}
}
if (gadget->data.select.num_items == 0) {
/* no options: ignore entire select */
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);
if (!inline_container)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0, box->title, 0,
content);
if (!inline_box)
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 &&
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;
}
if (gadget->data.select.num_selected == 0)
inline_box->text = talloc_strdup(content,
messages_get("Form_None"));
else if (gadget->data.select.num_selected == 1)
inline_box->text = talloc_strdup(content,
gadget->data.select.current->text);
else
inline_box->text = talloc_strdup(content,
messages_get("Form_Many"));
if (!inline_box->text)
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 option
* \param n xml element node for <option>
* \return true on success, false on memory exhaustion
*/
bool box_select_add_option(struct form_control *control, xmlNode *n)
{
char *value = 0;
char *text = 0;
char *text_nowrap = 0;
bool selected;
xmlChar *content;
char *s;
content = xmlNodeGetContent(n);
if (!content)
goto no_memory;
text = squash_whitespace((const char *) content);
xmlFree(content);
if (!text)
goto no_memory;
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "value"))) {
value = strdup(s);
xmlFree(s);
} else
value = strdup(text);
if (!value)
goto no_memory;
selected = xmlHasProp(n, (const xmlChar *) "selected") != NULL;
/* replace spaces/TABs with hard spaces to prevent line wrapping */
text_nowrap = cnv_space2nbsp(text);
if (!text_nowrap)
goto no_memory;
if (!form_add_option(control, value, text_nowrap, selected))
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)
{
/* A textarea is an INLINE_BLOCK containing a single INLINE_CONTAINER,
* which contains the text as runs of TEXT separated by BR. There is
* at least one TEXT. The first and last boxes are TEXT.
* Consecutive BR may not be present. These constraints are satisfied
* by using a 0-length TEXT for blank lines. */
xmlChar *current, *string;
xmlNode *n2;
xmlBufferPtr buf;
xmlParserCtxtPtr ctxt;
struct box *inline_container, *inline_box, *br_box;
char *s;
size_t len;
box->type = BOX_INLINE_BLOCK;
box->gadget = binding_get_control_for_node(content->parser_binding, n);
if (!box->gadget)
return false;
box->gadget->box = box;
inline_container = box_create(NULL, 0, false, 0, 0, box->title, 0,
content);
if (!inline_container)
return false;
inline_container->type = BOX_INLINE_CONTAINER;
box_add_child(box, inline_container);
/** \todo Is it really necessary to reparse the content of a
* textarea element to remove entities? Hubbub will do that for us.
*/
n2 = n->children;
buf = xmlBufferCreate();
while(n2) {
int ret = xmlNodeDump(buf, n2->doc, n2, 0, 0);
if (ret == -1) {
xmlBufferFree(buf);
return false;
}
n2 = n2->next;
}
ctxt = xmlCreateDocParserCtxt(buf->content);
string = current = NULL;
if (ctxt) {
string = current = xmlStringDecodeEntities(ctxt,
buf->content,
XML_SUBSTITUTE_REF,
0, 0, 0);
xmlFreeParserCtxt(ctxt);
}
if (!string) {
/* If we get here, either the parser context failed to be
* created or we were unable to decode the entities in the
* buffer. Therefore, try to create a blank string in order
* to recover. */
string = current = xmlStrdup((const xmlChar *) "");
if (!string) {
xmlBufferFree(buf);
return false;
}
}
while (1) {
/* BOX_TEXT */
len = strcspn((const char *) current, "\r\n");
s = talloc_strndup(content, (const char *) current, len);
if (!s) {
xmlFree(string);
xmlBufferFree(buf);
return false;
}
inline_box = box_create(NULL, box->style, false, 0, 0,
box->title, 0, content);
if (!inline_box) {
xmlFree(string);
xmlBufferFree(buf);
return false;
}
inline_box->type = BOX_TEXT;
inline_box->text = s;
inline_box->length = len;
box_add_child(inline_container, inline_box);
current += len;
if (current[0] == 0)
/* finished */
break;
/* BOX_BR */
br_box = box_create(NULL, box->style, false, 0, 0, box->title,
0, content);
if (!br_box) {
xmlFree(string);
xmlBufferFree(buf);
return false;
}
br_box->type = BOX_BR;
box_add_child(inline_container, br_box);
if (current[0] == '\r' && current[1] == '\n')
current += 2;
else
current++;
}
xmlFree(string);
xmlBufferFree(buf);
*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;
xmlChar *src;
xmlAttr *a;
if (box->style && css_computed_display(box->style,
n->parent == NULL) == CSS_DISPLAY_NONE)
return true;
params = talloc(content, struct object_params);
if (!params)
return false;
talloc_set_destructor(params, box_object_talloc_destructor);
params->data = 0;
params->type = 0;
params->codetype = 0;
params->codebase = 0;
params->classid = 0;
params->params = 0;
/* src is a URL */
if (!(src = xmlGetProp(n, (const xmlChar *) "src")))
return true;
if (!box_extract_link((char *) src, content->base_url, &params->data))
return false;
xmlFree(src);
if (!params->data)
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 */
for (a = n->properties; a; a = a->next) {
if (strcasecmp((const char *) a->name, "src") == 0)
continue;
if (!a->children || !a->children->content)
continue;
param = talloc(content, struct object_param);
if (!param)
return false;
param->name = talloc_strdup(content, (const char *) a->name);
param->value = talloc_strdup(content,
(char *) a->children->content);
param->type = 0;
param->valuetype = talloc_strdup(content, "data");
param->next = 0;
if (!param->name || !param->value || !param->valuetype)
return false;
param->next = params->params;
params->params = param;
}
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(xmlNode *n, const char *attribute,
void *context, char **value)
{
xmlChar *s = xmlGetProp(n, (const xmlChar *) attribute);
if (!s)
return true;
*value = talloc_strdup(context, (const char *) s);
xmlFree(s);
if (!*value)
return false;
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;
/* 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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