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netsurf/render/box_construct.c
Michael Drake 749dfa52ba Completion of first-letter and first-line pseudo element computed styles is not handled yet. 
svn path=/trunk/netsurf/; revision=11228
2011-01-06 11:11:47 +00:00

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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/browser.h"
#include "desktop/options.h"
#include "render/box.h"
#include "render/form.h"
#include "render/html.h"
#include "desktop/gui.h"
#include "utils/locale.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/url.h"
#include "utils/utils.h"
static const content_type image_types[] = {
#ifdef WITH_JPEG
CONTENT_JPEG,
#endif
#ifdef WITH_GIF
CONTENT_GIF,
#endif
#ifdef WITH_BMP
CONTENT_BMP,
#endif
#if defined(WITH_MNG) || defined(WITH_PNG)
CONTENT_PNG,
#endif
#ifdef WITH_MNG
CONTENT_JNG,
CONTENT_MNG,
#endif
#if defined(WITH_NS_SVG) || defined(WITH_RSVG)
CONTENT_SVG,
#endif
#if defined(WITH_SPRITE) || defined(WITH_NSSPRITE)
CONTENT_SPRITE,
#endif
#ifdef WITH_DRAW
CONTENT_DRAW,
#endif
#ifdef WITH_ARTWORKS
CONTENT_ARTWORKS,
#endif
#ifdef WITH_WEBP
CONTENT_WEBP,
#endif
#ifdef WITH_AMIGA_ICON
CONTENT_AMIGA_ICON,
#endif
CONTENT_UNKNOWN };
/* 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 bool convert_xml_to_box(xmlNode *n, struct content *content,
const css_computed_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title);
bool box_construct_element(xmlNode *n, struct content *content,
const css_computed_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title);
void box_construct_after(xmlNode *n, struct content *content,
struct box *box, const css_computed_style *after_style);
bool box_construct_text(xmlNode *n, struct content *content,
const css_computed_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title);
static css_select_results * box_get_style(struct 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, struct 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,
struct 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_applet(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},
/* {"applet", box_applet},*/
{"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
* \return true on success, false on memory exhaustion
*/
bool xml_to_box(xmlNode *n, struct content *c)
{
struct box root;
struct box *inline_container = NULL;
assert(c->type == CONTENT_HTML);
root.type = BOX_BLOCK;
root.style = NULL;
root.next = NULL;
root.prev = NULL;
root.children = NULL;
root.last = NULL;
root.parent = NULL;
root.float_children = NULL;
root.next_float = NULL;
c->data.html.object_count = 0;
c->data.html.object = 0;
/* The root box's style */
if (!convert_xml_to_box(n, c, NULL, &root,
&inline_container, 0, 0, 0))
return false;
if (!box_normalise_block(&root, c))
return false;
c->data.html.layout = root.children;
c->data.html.layout->parent = NULL;
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*/
};
/**
* Recursively construct a box tree from an xml tree and stylesheets.
*
* \param n fragment of xml tree
* \param content content of type CONTENT_HTML that is being processed
* \param parent_style style at this point in xml tree, or NULL for root box
* \param parent parent in box tree
* \param inline_container current inline container box, or 0, updated to
* new current inline container on exit
* \param href current link URL, or 0 if not in a link
* \param target current link target, or 0 if none
* \param title current title, or 0 if none
* \return true on success, false on memory exhaustion
*/
bool convert_xml_to_box(xmlNode *n, struct content *content,
const css_computed_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title)
{
switch (n->type) {
case XML_ELEMENT_NODE:
return box_construct_element(n, content, parent_style, parent,
inline_container, href, target, title);
case XML_TEXT_NODE:
return box_construct_text(n, content, parent_style, parent,
inline_container, href, target, title);
default:
/* not an element or text node: ignore it (eg. comment) */
return true;
}
}
/**
* Construct the box tree for an XML element.
*
* \param n XML node of type XML_ELEMENT_NODE
* \param content content of type CONTENT_HTML that is being processed
* \param parent_style style at this point in xml tree, or NULL for root node
* \param parent parent in box tree
* \param inline_container current inline container box, or 0, updated to
* new current inline container on exit
* \param href current link URL, or 0 if not in a link
* \param target current link target, or 0 if none
* \param title current title, or 0 if none
* \return true on success, false on memory exhaustion
*/
bool box_construct_element(xmlNode *n, struct content *content,
const css_computed_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title)
{
bool convert_children = true;
char *id = 0;
char *s;
struct box *box = 0;
struct box *inline_container_c;
struct box *inline_end;
css_select_results *styles = NULL;
struct element_entry *element;
xmlChar *title0;
xmlNode *c;
lwc_string *bgimage_uri;
assert(n);
assert(n->type == XML_ELEMENT_NODE);
assert(parent);
assert(inline_container);
gui_multitask();
/* In case the parent is a pre block, we clear the
* strip_leading_newline flag since it is not used if we
* follow the pre with a tag
*/
parent->strip_leading_newline = 0;
styles = box_get_style(content, parent_style, n);
if (!styles)
return false;
/* extract title attribute, if present */
if ((title0 = xmlGetProp(n, (const xmlChar *) "title"))) {
char *title1 = squash_whitespace((char *) title0);
xmlFree(title0);
if (!title1)
return false;
title = talloc_strdup(content, title1);
free(title1);
if (!title)
return false;
}
/* extract id attribute, if present */
if (!box_get_attribute(n, "id", content, &id))
return false;
/* create box for this element */
box = box_create(styles, styles->styles[CSS_PSEUDO_ELEMENT_NONE], false,
href, target, title, id, content);
if (!box)
return false;
/* 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,
n->parent == NULL)];
}
/* special elements */
element = bsearch((const char *) n->name, element_table,
ELEMENT_TABLE_COUNT, sizeof(element_table[0]),
(int (*)(const void *, const void *)) strcmp);
if (element) {
/* a special convert function exists for this element */
if (!element->convert(n, content, box, &convert_children))
return false;
href = box->href;
target = box->target;
}
if (box->type == BOX_NONE || css_computed_display(box->style,
n->parent == NULL) == CSS_DISPLAY_NONE) {
/* Free style and invalidate box's style pointer */
css_select_results_destroy(styles);
box->styles = NULL;
box->style = NULL;
/* If this box has an associated gadget, invalidate the
* gadget's box pointer and our pointer to the gadget. */
if (box->gadget) {
box->gadget->box = NULL;
box->gadget = NULL;
}
/* We can't do this, as it will destroy any gadget
* associated with the box, thus making any form usage
* access freed memory. The box is in the talloc context,
* anyway, so will get cleaned up with the content. */
/* box_free_box(box); */
return true;
}
if (!*inline_container &&
(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)) {
/* this is the first inline in a block: make a container */
*inline_container = box_create(NULL, 0, false, 0, 0, 0, 0,
content);
if (!*inline_container)
return false;
(*inline_container)->type = BOX_INLINE_CONTAINER;
box_add_child(parent, *inline_container);
}
if (box->type == BOX_INLINE || box->type == BOX_BR) {
/* inline box: add to tree and recurse */
box_add_child(*inline_container, box);
if (convert_children && n->children) {
for (c = n->children; c; c = c->next)
if (!convert_xml_to_box(c, content, box->style,
parent, inline_container,
href, target, title))
return false;
inline_end = box_create(NULL, box->style, false, href,
target, title, id, content);
if (!inline_end)
return false;
inline_end->type = BOX_INLINE_END;
if (*inline_container)
box_add_child(*inline_container, inline_end);
else
box_add_child(box->parent, inline_end);
box->inline_end = inline_end;
inline_end->inline_end = box;
}
} else if (box->type == BOX_INLINE_BLOCK) {
/* inline block box: add to tree and recurse */
box_add_child(*inline_container, box);
inline_container_c = 0;
for (c = n->children; convert_children && c; c = c->next)
if (!convert_xml_to_box(c, content, box->style, box,
&inline_container_c,
href, target, title))
return false;
} else {
/* list item: compute marker, then treat as non-inline box */
if (css_computed_display(box->style, n->parent == NULL) ==
CSS_DISPLAY_LIST_ITEM) {
lwc_string *image_uri;
struct box *marker;
marker = box_create(NULL, box->style, false, 0, 0,
title, 0, content);
if (!marker)
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)
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) {
if (!html_fetch_object(content,
lwc_string_data(image_uri),
marker, image_types,
content->available_width,
1000, false))
return false;
}
box->list_marker = marker;
marker->parent = box;
}
/* float: insert a float box between the parent and
* current node. Note: new parent will be the float */
if (css_computed_float(box->style) == CSS_FLOAT_LEFT ||
css_computed_float(box->style) ==
CSS_FLOAT_RIGHT) {
parent = box_create(NULL, 0, false, href, target, title,
0, content);
if (!parent)
return false;
if (css_computed_float(box->style) == CSS_FLOAT_LEFT)
parent->type = BOX_FLOAT_LEFT;
else
parent->type = BOX_FLOAT_RIGHT;
box_add_child(*inline_container, parent);
}
/* non-inline box: add to tree and recurse */
box_add_child(parent, box);
inline_container_c = 0;
for (c = n->children; convert_children && c; c = c->next)
if (!convert_xml_to_box(c, content, box->style, box,
&inline_container_c,
href, target, title))
return false;
if (css_computed_float(box->style) == CSS_FLOAT_NONE)
/* new inline container unless this is a float */
*inline_container = 0;
}
/* misc. attributes that can't be handled in box_get_style() */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "colspan"))) {
if (isdigit(s[0])) {
box->columns = strtol(s, NULL, 10);
}
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "rowspan"))) {
if (isdigit(s[0])) {
box->rows = strtol(s, NULL, 10);
}
xmlFree(s);
}
/* fetch any background image for this box */
if (css_computed_background_image(box->style, &bgimage_uri) ==
CSS_BACKGROUND_IMAGE_IMAGE &&
bgimage_uri != NULL) {
if (!html_fetch_object(content,
lwc_string_data(bgimage_uri),
box, image_types, content->available_width,
1000, true))
return false;
}
/* handle the :after pseudo element */
/* TODO: Replace with true implementation.
* Currently we only implement enough of this to support the
* 'clearfix' hack, which is in widespread use and the layout
* of many sites depend on. As such, only bother if box is a
* block for now. */
if (box->type == BOX_BLOCK) {
box_construct_after(n, content, box,
box->styles->styles[CSS_PSEUDO_ELEMENT_AFTER]);
}
return true;
}
/**
* Construct the box required for an :after pseudo 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 an :after s
* \param after_style complete computed style for after pseudo element
*
* TODO:
* This is currently incomplete. It just does enough to support the clearfix
* hack. ( http://www.positioniseverything.net/easyclearing.html )
*
* 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.
*
* We don't actually support generated content yet.
*/
void box_construct_after(xmlNode *n, struct content *content,
struct box *box, const css_computed_style *after_style)
{
struct box *after = 0;
const css_computed_content_item *c_item;
if (after_style == NULL ||
css_computed_content(after_style, &c_item) ==
CSS_CONTENT_NORMAL) {
/* No pseudo element */
return;
}
/* create box for this element */
if (css_computed_display(after_style, n->parent == NULL) ==
CSS_DISPLAY_BLOCK) {
/* currently only support block level after elements */
/** \todo Not wise to drop const from the computed style */
after = box_create(NULL, (css_computed_style *)after_style,
false, NULL, NULL, NULL, NULL, content);
if (after == NULL) {
return;
}
/* set box type from computed display */
if ((css_computed_position(after_style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(after_style) ==
CSS_POSITION_FIXED) &&
(css_computed_display_static(after_style) ==
CSS_DISPLAY_INLINE ||
css_computed_display_static(after_style) ==
CSS_DISPLAY_INLINE_BLOCK ||
css_computed_display_static(after_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. */
after->type = box_map[CSS_DISPLAY_INLINE_BLOCK];
} else {
/* Normal mapping */
after->type = box_map[css_computed_display(
after_style, n->parent == NULL)];
}
box_add_child(box, after);
}
}
/**
* Construct the box tree for an XML text node.
*
* \param n XML node of type XML_TEXT_NODE
* \param content content of type CONTENT_HTML that is being processed
* \param parent_style style at this point in xml tree
* \param parent parent in box tree
* \param inline_container current inline container box, or 0, updated to
* new current inline container on exit
* \param href current link URL, or 0 if not in a link
* \param target current link target, or 0 if none
* \param title current title, or 0 if none
* \return true on success, false on memory exhaustion
*/
bool box_construct_text(xmlNode *n, struct content *content,
const css_computed_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title)
{
struct box *box = 0;
assert(n);
assert(n->type == XML_TEXT_NODE);
assert(parent_style);
assert(parent);
assert(inline_container);
if (css_computed_white_space(parent_style) == CSS_WHITE_SPACE_NORMAL ||
css_computed_white_space(parent_style) ==
CSS_WHITE_SPACE_NOWRAP) {
char *text = squash_whitespace((char *) n->content);
if (!text)
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 (*inline_container) {
if ((*inline_container)->last == 0) {
LOG(("empty inline_container %p",
*inline_container));
while (parent->parent &&
parent->parent->parent)
parent = parent->parent;
box_dump(stderr, parent, 0);
}
assert((*inline_container)->last != 0);
(*inline_container)->last->space = 1;
}
free(text);
return true;
}
if (!*inline_container) {
/* this is the first inline node: make a container */
*inline_container = box_create(NULL, 0, false, 0, 0, 0,
0, content);
if (!*inline_container) {
free(text);
return false;
}
(*inline_container)->type = BOX_INLINE_CONTAINER;
box_add_child(parent, *inline_container);
}
/** \todo Dropping const here is not clever */
box = box_create(NULL, (css_computed_style *) parent_style,
false, href, target, title, 0, content);
if (!box) {
free(text);
return false;
}
box->type = BOX_TEXT;
box->text = talloc_strdup(content, text);
free(text);
if (!box->text)
return false;
box->length = strlen(box->text);
/* strip ending space char off */
if (box->length > 1 && box->text[box->length - 1] == ' ') {
box->space = 1;
box->length--;
}
if (css_computed_text_transform(parent_style) !=
CSS_TEXT_TRANSFORM_NONE)
box_text_transform(box->text, box->length,
css_computed_text_transform(parent_style));
if (css_computed_white_space(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(*inline_container, box);
if (box->text[0] == ' ') {
box->length--;
memmove(box->text, &box->text[1], box->length);
if (box->prev != NULL)
box->prev->space = 1;
}
} else {
/* white-space: pre */
char *text = cnv_space2nbsp((char *) n->content);
char *current;
enum css_white_space_e white_space =
css_computed_white_space(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)
return false;
if (css_computed_text_transform(parent_style) !=
CSS_TEXT_TRANSFORM_NONE)
box_text_transform(text, strlen(text),
css_computed_text_transform(parent_style));
current = text;
/* swallow a single leading new line */
if (parent->strip_leading_newline) {
switch (*current) {
case '\n':
current++; break;
case '\r':
current++;
if (*current == '\n') current++;
break;
}
parent->strip_leading_newline = 0;
}
do {
size_t len = strcspn(current, "\r\n");
char old = current[len];
current[len] = 0;
if (!*inline_container) {
*inline_container = box_create(NULL, 0, false,
0, 0, 0, 0, content);
if (!*inline_container) {
free(text);
return false;
}
(*inline_container)->type =
BOX_INLINE_CONTAINER;
box_add_child(parent, *inline_container);
}
/** \todo Dropping const isn't clever */
box = box_create(NULL,
(css_computed_style *) parent_style,
false, href, target, title, 0, content);
if (!box) {
free(text);
return false;
}
box->type = BOX_TEXT;
box->text = talloc_strdup(content, current);
if (!box->text) {
free(text);
return false;
}
box->length = strlen(box->text);
box_add_child(*inline_container, box);
current[len] = old;
current += len;
if (current[0] == '\r' && current[1] == '\n') {
current += 2;
*inline_container = 0;
} else if (current[0] != 0) {
current++;
*inline_container = 0;
}
} 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(struct 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;
/* 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->data.html.encoding, content__get_url(c),
c->data.html.quirks != BINDING_QUIRKS_MODE_NONE,
box_style_alloc, NULL);
xmlFree(s);
if (inline_style == NULL)
return NULL;
}
/* Select partial style for element */
styles = nscss_get_style(c, 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)
{
enum css_background_color_e type;
css_color color;
type = css_computed_background_color(box->style, &color);
if (type == CSS_BACKGROUND_COLOR_TRANSPARENT)
content->data.html.background_colour = NS_TRANSPARENT;
else
content->data.html.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->strip_leading_newline = 1;
return true;
}
/**
* Anchor [12.2].
*/
bool box_a(BOX_SPECIAL_PARAMS)
{
bool ok;
char *url;
xmlChar *s;
if ((s = xmlGetProp(n, (const xmlChar *) "href"))) {
ok = box_extract_link((const char *) s,
content->data.html.base_url, &url);
xmlFree(s);
if (!ok)
return false;
if (url) {
box->href = talloc_strdup(content, url);
free(url);
if (!box->href)
return false;
}
}
/* name and id share the same namespace */
if (!box_get_attribute(n, "name", content, &box->id))
return false;
/* 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, *url;
xmlChar *alt, *src;
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->data.html.base_url, &url))
return false;
xmlFree(src);
if (!url)
return true;
/* start fetch */
ok = html_fetch_object(content, url, box, image_types,
content->available_width, 1000, false);
free(url);
return ok;
}
/**
* 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;
struct box *inline_container = 0;
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;
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->data.html.base_url,
&params->codebase))
return false;
xmlFree(codebase);
}
if (!params->codebase)
params->codebase = content->data.html.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 &&
strcmp(content->data.html.base_url,
params->classid) == 0)
return true;
if (params->data &&
strcmp(content->data.html.base_url,
params->data) == 0)
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 && !params->data && params->codetype &&
content_lookup(params->codetype) == CONTENT_OTHER)
/* can't handle this MIME type */
return true;
if (params->data && params->type &&
content_lookup(params->type) == CONTENT_OTHER)
/* can't handle this MIME type */
return true;
/* 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, 0, content->available_width, 1000, false))
return false;
/* convert children and place into fallback */
for (c = n->children; c; c = c->next) {
if (!convert_xml_to_box(c, content, box->style, box,
&inline_container, 0, 0, 0))
return false;
}
box->fallback = box->children;
box->children = box->last = 0;
*convert_children = false;
return true;
}
#if 0 /**
* "Java applet" [13.4].
*
* \todo This needs reworking to be compliant to the spec
* For now, we simply ignore all applet tags.
*/
struct box_result box_applet(xmlNode *n, struct box_status *status,
struct css_style *style)
{
struct box *box;
struct object_params *po;
struct object_param *pp = NULL;
char *s;
xmlNode *c;
po = calloc(1, sizeof(struct object_params));
if (!po)
return (struct box_result) {0, false, true};
box = box_create(style, false, status->href, 0, status->id,
status->content->data.html.box_pool);
if (!box) {
free(po);
return (struct box_result) {0, false, true};
}
/* archive */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "archive")) != NULL) {
/** \todo tokenise this comma separated list */
LOG(("archive '%s'", s));
po->data = strdup(s);
xmlFree(s);
if (!po->data)
goto no_memory;
}
/* code */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "code")) != NULL) {
LOG(("applet '%s'", s));
po->classid = strdup(s);
xmlFree(s);
if (!po->classid)
goto no_memory;
}
/* object codebase */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "codebase")) != NULL) {
po->codebase = strdup(s);
LOG(("codebase: %s", s));
xmlFree(s);
if (!po->codebase)
goto no_memory;
}
/* parameters
* parameter data is stored in a singly linked list.
* po->params points to the head of the list.
* new parameters are added to the head of the list.
*/
for (c = n->children; c != 0; c = c->next) {
if (c->type != XML_ELEMENT_NODE)
continue;
if (strcmp((const char *) c->name, "param") == 0) {
pp = calloc(1, sizeof(struct object_param));
if (!pp)
goto no_memory;
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "name")) != NULL) {
pp->name = strdup(s);
xmlFree(s);
if (!pp->name)
goto no_memory;
}
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "value")) != NULL) {
pp->value = strdup(s);
xmlFree(s);
if (!pp->value)
goto no_memory;
}
if ((s = (char *) xmlGetProp(c,
(const xmlChar *) "type")) != NULL) {
pp->type = strdup(s);
xmlFree(s);
if (!pp->type)
goto no_memory;
}
if ((s = (char *) xmlGetProp(c, (const xmlChar *)
"valuetype")) != NULL) {
pp->valuetype = strdup(s);
xmlFree(s);
if (!pp->valuetype)
goto no_memory;
} else {
pp->valuetype = strdup("data");
if (!pp->valuetype)
goto no_memory;
}
pp->next = po->params;
po->params = pp;
} else {
/* The first non-param child is the start
* of the alt html. Therefore, we should
* break out of this loop.
*/
break;
}
}
box->object_params = po;
/* start fetch */
if (plugin_decode(status->content, box))
return (struct box_result) {box, false, false};
return (struct box_result) {box, true, false};
no_memory:
if (pp && pp != po->params) {
/* ran out of memory creating parameter struct */
free(pp->name);
free(pp->value);
free(pp->type);
free(pp->valuetype);
free(pp);
}
box_free_object_params(po);
box_free_box(box);
return (struct box_result) {0, false, true};
}
#endif
/**
* Window subdivision [16.2.1].
*/
bool box_frameset(BOX_SPECIAL_PARAMS)
{
bool ok;
if (content->data.html.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->data.html.frameset = talloc_zero(content,
struct content_html_frames);
if (!content->data.html.frameset)
return false;
ok = box_create_frameset(content->data.html.frameset, n, content);
if (ok)
box->type = BOX_NONE;
if (convert_children)
*convert_children = false;
return ok;
}
bool box_create_frameset(struct content_html_frames *f, xmlNode *n,
struct content *content) {
unsigned int row, col, index, i;
unsigned int rows = 1, cols = 1;
char *s, *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));
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->data.html.base_url,
&url);
xmlFree(s);
}
/* copy url */
if (url) {
/* no self-references */
if (strcmp(content->data.html.base_url, url))
frame->url = talloc_strdup(content,
url);
free(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;
}
/**
* Inline subwindow [16.5].
*/
bool box_iframe(BOX_SPECIAL_PARAMS)
{
char *url, *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->data.html.base_url, &url)) {
xmlFree(s);
return false;
}
xmlFree(s);
if (!url)
return true;
/* don't include ourself */
if (strcmp(content->data.html.base_url, url) == 0) {
free(url);
return true;
}
/* create a new iframe */
iframe = talloc(content, struct content_html_iframe);
if (!iframe) {
free(url);
return false;
}
iframe->box = box;
iframe->margin_width = 0;
iframe->margin_height = 0;
iframe->name = NULL;
iframe->url = talloc_strdup(content, url);
iframe->scrolling = SCROLLING_AUTO;
iframe->border = true;
/* Add this iframe to the linked list of iframes */
iframe->next = content->data.html.iframe;
content->data.html.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);
}
/* release temporary memory */
free(url);
/* box */
box->type = BOX_INLINE_BLOCK;
assert(box->style);
/* 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, *url;
url_func_result res;
type = (char *) xmlGetProp(n, (const xmlChar *) "type");
gadget = binding_get_control_for_node(content->data.html.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"))) {
res = url_join(s,
content->data.html.base_url, &url);
xmlFree(s);
/* if url is equivalent to the parent's url,
* we've got infinite inclusion. stop it here
* also bail if url_join failed.
*/
if (res == URL_FUNC_OK &&
strcasecmp(url,
content->data.
html.base_url) != 0) {
if (!html_fetch_object(content, url,
box, image_types,
content->
available_width,
1000, false)) {
free(url);
goto no_memory;
}
}
free(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->data.html.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->data.html.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->data.html.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;
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->data.html.base_url,
&params->data))
return false;
xmlFree(src);
if (!params->data)
return true;
/* Don't include ourself */
if (strcmp(content->data.html.base_url, params->data) == 0)
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, 0,
content->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, const char *base, char **result)
{
char *s, *s1, *apos0 = 0, *apos1 = 0, *quot0 = 0, *quot1 = 0;
unsigned int i, j, end;
url_func_result res;
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 */
res = url_join(s1, base, result);
free(s);
if (res == URL_FUNC_NOMEM)
return false;
else if (res == URL_FUNC_FAILED)
return true;
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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