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netsurf/render/box_construct.c
John Mark Bell 90c0fb6f3e Fix frame targets. 
svn path=/trunk/netsurf/; revision=7729
2009-06-08 09:34:58 +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).
*/
#define _GNU_SOURCE /* for strndup */
#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.h"
#include "css/css.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
CONTENT_UNKNOWN };
#define MAX_SPAN (100)
/* 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";
/* keeps track of markup presentation */
struct markup_track {
enum {
ALIGN_NONE,
ALIGN_LEFT,
ALIGN_CENTER,
ALIGN_RIGHT
} align;
bool cell_border;
colour border_color;
bool cell_padding;
long padding_width;
bool table;
};
static bool convert_xml_to_box(xmlNode *n, struct content *content,
struct css_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title,
struct markup_track markup_track,
struct css_importance *author);
bool box_construct_element(xmlNode *n, struct content *content,
struct css_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title,
struct markup_track markup_track,
struct css_importance *author);
bool box_construct_text(xmlNode *n, struct content *content,
struct css_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title);
static struct css_style * box_get_style(struct content *c,
struct css_style *parent_style,
xmlNode *n, struct markup_track *markup_track,
struct css_importance *author);
static void box_solve_display(struct css_style *style, bool root);
static void box_text_transform(char *s, unsigned int len,
css_text_transform tt);
#define BOX_SPECIAL_PARAMS xmlNode *n, struct content *content, \
struct box *box, bool *convert_children, \
struct markup_track markup_track, \
struct css_importance *author
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);
static void parse_inline_colour(char *text, colour *variable);
/* 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 = 0;
struct css_importance author;
struct markup_track markup_track;
markup_track.cell_border = false;
markup_track.cell_padding = false;
markup_track.align = ALIGN_NONE;
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.style = talloc_memdup(c, &css_base_style,
sizeof css_base_style);
if (!c->data.html.style)
return false;
c->data.html.style->font_size.value.length.value =
option_font_size * 0.1;
/* and get the default font family from the options */
c->data.html.style->font_family = option_font_default;
c->data.html.object_count = 0;
c->data.html.object = 0;
if (!convert_xml_to_box(n, c, c->data.html.style, &root,
&inline_container, 0, 0, 0, markup_track, &author))
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 css/css_enums */
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_INLINE, /*CSS_DISPLAY_TABLE_COLUMN_GROUP,*/
BOX_INLINE, /*CSS_DISPLAY_TABLE_COLUMN,*/
BOX_TABLE_CELL, /*CSS_DISPLAY_TABLE_CELL,*/
BOX_INLINE /*CSS_DISPLAY_TABLE_CAPTION,*/
};
/**
* 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
* \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
* \param markup_track track presentation markup that affects descendents
* \param author denotes whether current style has author level
* importance for certain properties
* \return true on success, false on memory exhaustion
*/
bool convert_xml_to_box(xmlNode *n, struct content *content,
struct css_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title,
struct markup_track markup_track,
struct css_importance *author)
{
switch (n->type) {
case XML_ELEMENT_NODE:
return box_construct_element(n, content, parent_style, parent,
inline_container,
href, target, title, markup_track, author);
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
* \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
* \param markup_track track presentation markup that affects descendents
* \param author denotes whether current style has author level
* importance for certain properties
* \return true on success, false on memory exhaustion
*/
bool box_construct_element(xmlNode *n, struct content *content,
struct css_style *parent_style,
struct box *parent, struct box **inline_container,
char *href, const char *target, char *title,
struct markup_track markup_track,
struct css_importance *author)
{
bool convert_children = true;
char *id = 0;
char *s;
struct box *box = 0;
struct box *inline_container_c;
struct box *inline_end;
struct css_style *style = 0;
struct element_entry *element;
xmlChar *title0;
xmlNode *c;
assert(n);
assert(n->type == XML_ELEMENT_NODE);
assert(parent_style);
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;
style = box_get_style(content, parent_style, n, &markup_track, author);
if (!style)
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(style, href, target, title, id, content);
if (!box)
return false;
/* set box type from style */
box->type = box_map[style->display];
/* 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,
markup_track, author))
return false;
href = box->href;
target = box->target;
}
if (style->display == CSS_DISPLAY_NONE) {
/* Free style and invalidate box's style pointer */
talloc_free(style);
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 ||
style->float_ == CSS_FLOAT_LEFT ||
style->float_ == CSS_FLOAT_RIGHT)) {
/* this is the first inline in a block: make a container */
*inline_container = box_create(0, 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, style,
parent, inline_container,
href, target, title,
markup_track, author))
return false;
inline_end = box_create(style, 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, style, box,
&inline_container_c,
href, target, title, markup_track,
author))
return false;
} else {
/* list item: compute marker, then treat as non-inline box */
if (style->display == CSS_DISPLAY_LIST_ITEM) {
struct box *marker;
marker = box_create(style, 0, 0, title, 0, content);
if (!marker)
return false;
marker->type = BOX_BLOCK;
/** \todo marker content (list-style-type) */
switch (style->list_style_type) {
case CSS_LIST_STYLE_TYPE_DISC:
default:
/* 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:
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 (style->list_style_image.type ==
CSS_LIST_STYLE_IMAGE_URI) {
if (!html_fetch_object(content,
style->list_style_image.uri,
marker,
0, 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 (style->float_ == CSS_FLOAT_LEFT ||
style->float_ == CSS_FLOAT_RIGHT) {
parent = box_create(0, href, target, title, 0, content);
if (!parent)
return false;
if (style->float_ == 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, style, box,
&inline_container_c,
href, target, title, markup_track,
author))
return false;
if (style->float_ == 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);
if ((MAX_SPAN < box->columns) || (box->columns < 1))
box->columns = 1;
}
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "rowspan"))) {
if (isdigit(s[0])) {
box->rows = strtol(s, NULL, 10);
if ((MAX_SPAN < box->rows) || (box->rows < 1))
box->rows = 1;
}
xmlFree(s);
}
/* fetch any background image for this box */
if (style->background_image.type == CSS_BACKGROUND_IMAGE_URI) {
if (!html_fetch_object(content, style->background_image.uri,
box, image_types, content->available_width,
1000, true))
return false;
}
return true;
}
/**
* 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,
struct css_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 (parent_style->white_space == CSS_WHITE_SPACE_NORMAL ||
parent_style->white_space == 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(0, 0, 0, 0, 0, content);
if (!*inline_container) {
free(text);
return false;
}
(*inline_container)->type = BOX_INLINE_CONTAINER;
box_add_child(parent, *inline_container);
}
box = box_create(parent_style, 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 (parent_style->text_transform != CSS_TEXT_TRANSFORM_NONE)
box_text_transform(box->text, box->length,
parent_style->text_transform);
if (parent_style->white_space == 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;
/* note: pre-wrap/pre-line are unimplemented */
assert(parent_style->white_space == CSS_WHITE_SPACE_PRE ||
parent_style->white_space ==
CSS_WHITE_SPACE_PRE_LINE ||
parent_style->white_space ==
CSS_WHITE_SPACE_PRE_WRAP);
if (!text)
return false;
if (parent_style->text_transform != CSS_TEXT_TRANSFORM_NONE)
box_text_transform(text, strlen(text),
parent_style->text_transform);
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(0, 0, 0, 0, 0,
content);
if (!*inline_container) {
free(text);
return false;
}
(*inline_container)->type =
BOX_INLINE_CONTAINER;
box_add_child(parent, *inline_container);
}
box = box_create(parent_style, 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
* \param n node in xml tree
* \param markup_track track presentation markup that affects descendents
* \param author denotes whether current style has author level
* importance for certain properties
* \return the new style, or 0 on memory exhaustion
*
* The style is collected from three sources:
* 1. any styles for this element in the document stylesheet(s)
* 2. the 'style' attribute
* 3. non-CSS HTML attributes (subject to importance of CSS style properties)
*/
struct css_style * box_get_style(struct content *c,
struct css_style *parent_style,
xmlNode *n, struct markup_track *markup_track,
struct css_importance *author)
{
char *s;
struct css_style *style;
struct css_style *style_new;
char *url;
url_func_result res;
colour border_color = 0x888888; /* mid-grey default for tables */
/* if not in a table, switch off cellpadding and cell borders
* and record that we're not in a table */
if (strcmp((const char *) n->name, "thead") != 0 &&
strcmp((const char *) n->name, "tbody") != 0 &&
strcmp((const char *) n->name, "tfoot") != 0 &&
strcmp((const char *) n->name, "tr") != 0 &&
strcmp((const char *) n->name, "td") != 0 &&
strcmp((const char *) n->name, "th") != 0 &&
strcmp((const char *) n->name, "col") != 0 &&
strcmp((const char *) n->name, "colgroup") != 0) {
markup_track->cell_border = false;
markup_track->cell_padding = false;
markup_track->table = false;
}
style = talloc_memdup(c, parent_style, sizeof *style);
if (!style)
return 0;
style_new = talloc_memdup(c, &css_blank_style, sizeof *style_new);
if (!style_new)
return 0;
css_get_style(c->data.html.working_stylesheet, n, style_new, author);
css_cascade(style, style_new, NULL);
/* style_new isn't needed past this point */
talloc_free(style_new);
/* Handle style attribute. (style attribute values have high enough
* specificity to override existing style data.) */
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "style"))) {
struct css_style *astyle;
astyle = css_duplicate_style(&css_empty_style);
if (!astyle) {
xmlFree(s);
return 0;
}
css_parse_property_list(c, astyle, s);
css_cascade(style, astyle, author);
css_free_style(astyle);
xmlFree(s);
}
/* Apply presentational HTML attributes to style
* (Only apply if style property does not have "author" level
* importance or higher.)
*/
/* This property only applies to the body element, if you believe
* the spec. Many browsers seem to allow it on other elements too,
* so let's be generic ;) */
if (!author->background_image && (s = (char *) xmlGetProp(n,
(const xmlChar *) "background"))) {
res = url_join(s, c->data.html.base_url, &url);
xmlFree(s);
if (res == URL_FUNC_NOMEM) {
return 0;
} else if (res == URL_FUNC_OK) {
/* if url is equivalent to the parent's url,
* we've got infinite inclusion: ignore */
if (strcmp(url, c->data.html.base_url) == 0)
free(url);
else {
style->background_image.type =
CSS_BACKGROUND_IMAGE_URI;
style->background_image.uri = talloc_strdup(
c, url);
free(url);
if (!style->background_image.uri)
return 0;
}
}
}
if (!author->background_color && (s = (char *) xmlGetProp(n,
(const xmlChar *) "bgcolor"))) {
parse_inline_colour(s, &style->background_color);
xmlFree(s);
}
if (!author->color && (s = (char *) xmlGetProp(n,
(const xmlChar *) "color"))) {
parse_inline_colour(s, &style->color);
xmlFree(s);
}
if (!author->height && (s = (char *) xmlGetProp(n,
(const xmlChar *) "height")) &&
((strcmp((const char *) n->name, "iframe") == 0) ||
(strcmp((const char *) n->name, "td") == 0) ||
(strcmp((const char *) n->name, "th") == 0) ||
(strcmp((const char *) n->name, "tr") == 0) ||
(strcmp((const char *) n->name, "img") == 0) ||
(strcmp((const char *) n->name, "object") == 0) ||
(strcmp((const char *) n->name, "applet") == 0))) {
float value = isdigit(s[0]) ? atof(s) : -1;
if (value <= 0 || strlen(s) == 0) {
/* ignore negative values and height="" */
} else if (strrchr(s, '%')) {
style->height.height = CSS_HEIGHT_PERCENT;
style->height.value.percent = value;
} else {
style->height.height = CSS_HEIGHT_LENGTH;
style->height.value.length.unit = CSS_UNIT_PX;
style->height.value.length.value = value;
}
xmlFree(s);
}
if (!author->width && strcmp((const char *) n->name, "input") == 0) {
int size = -1;
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "size"))) {
size = isdigit(s[0]) ? atoi(s): -1;
if (0 < size) {
char *type = (char *) xmlGetProp(n,
(const xmlChar *) "type");
style->width.width = CSS_WIDTH_LENGTH;
if (!type || strcasecmp(type, "text") == 0 ||
strcasecmp(type, "password") == 0)
/* in characters for text, password */
style->width.value.length.unit =
CSS_UNIT_EX;
else if (strcasecmp(type, "file") != 0)
/* in pixels otherwise; ignore width
* on file, because we do them
* differently to most browsers */
style->width.value.length.unit =
CSS_UNIT_PX;
style->width.value.length.value = size;
if (type)
xmlFree(type);
}
xmlFree(s);
}
/* If valid maxlength value is provided, the size attribute is
* unset and maxlength is small, use it to reduce input width
* to sensible size */
if ((s = (char *) xmlGetProp(n, (const xmlChar *)
"maxlength"))) {
int maxlength = isdigit(s[0]) ? atoi(s): -1;
if (0 < maxlength && size == -1 && maxlength < 10) {
char *type;
/* Bump up really small widths */
maxlength = maxlength < 5 ? maxlength + 1 :
maxlength;
type = (char *) xmlGetProp(n,
(const xmlChar *) "type");
style->width.width = CSS_WIDTH_LENGTH;
if (!type || strcasecmp(type, "text") == 0 ||
strcasecmp(type, "password") == 0)
/* in characters for text, password */
style->width.value.length.unit =
CSS_UNIT_EX;
style->width.value.length.value = maxlength;
if (type)
xmlFree(type);
}
xmlFree(s);
}
}
if (!author->color && strcmp((const char *) n->name, "body") == 0) {
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "text"))) {
parse_inline_colour(s, &style->color);
xmlFree(s);
}
}
if (!author->width && (s = (char *) xmlGetProp(n,
(const xmlChar *) "width")) &&
((strcmp((const char *) n->name, "hr") == 0) ||
(strcmp((const char *) n->name, "iframe") == 0) ||
(strcmp((const char *) n->name, "img") == 0) ||
(strcmp((const char *) n->name, "object") == 0) ||
(strcmp((const char *) n->name, "table") == 0) ||
(strcmp((const char *) n->name, "td") == 0) ||
(strcmp((const char *) n->name, "th") == 0) ||
(strcmp((const char *) n->name, "applet") == 0))) {
float value = isdigit(s[0]) ? atof(s) : -1;
if (value < 0 || strlen(s) == 0) {
/* ignore negative values and width="" */
} else if (strrchr(s, '%')) {
style->width.width = CSS_WIDTH_PERCENT;
style->width.value.percent = value;
} else {
style->width.width = CSS_WIDTH_LENGTH;
style->width.value.length.unit = CSS_UNIT_PX;
style->width.value.length.value = value;
}
xmlFree(s);
}
if (strcmp((const char *) n->name, "textarea") == 0) {
if (!author->height && (s = (char *) xmlGetProp(n,
(const xmlChar *) "rows"))) {
int value = isdigit(s[0]) ? atoi(s): -1;
if (0 < value) {
style->height.height = CSS_HEIGHT_LENGTH;
style->height.value.length.unit = CSS_UNIT_EM;
style->height.value.length.value = value;
}
xmlFree(s);
}
if (!author->width && (s = (char *) xmlGetProp(n,
(const xmlChar *) "cols"))) {
int value = isdigit(s[0]) ? atoi(s): -1;
if (0 < value) {
style->width.width = CSS_WIDTH_LENGTH;
style->width.value.length.unit = CSS_UNIT_EX;
style->width.value.length.value = value;
}
xmlFree(s);
}
}
if (strcmp((const char *) n->name, "table") == 0) {
if (!author->border_spacing && (s = (char *) xmlGetProp(n,
(const xmlChar *) "cellspacing"))) {
/* percentage cellspacing not implemented */
if (!strrchr(s, '%')) {
int value = isdigit(s[0]) ? atoi(s): -1;
if (0 <= value) {
style->border_spacing.border_spacing =
CSS_BORDER_SPACING_LENGTH;
style->border_spacing.horz.unit =
style->border_spacing.vert.unit =
CSS_UNIT_PX;
style->border_spacing.horz.value =
style->border_spacing.vert.value =
value;
}
}
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "bordercolor"))) {
parse_inline_colour(s, &border_color);
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "border"))) {
int border_width = atoi(s);
/* precentage border width not implemented */
if (!strrchr(s, '%') && 0 < border_width) {
unsigned int i;
for (i = 0; i != 4; i++) {
if (!author->border_color[i])
style->border[i].color =
border_color;
if (!author->border_width[i]) {
style->border[i].width.width =
CSS_BORDER_WIDTH_LENGTH;
style->border[i].width.value.
value = border_width;
style->border[i].width.value.
unit = CSS_UNIT_PX;
}
if (!author->border_style[i])
style->border[i].style =
CSS_BORDER_STYLE_OUTSET;
}
}
xmlFree(s);
}
}
if (strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
/* set any cellborders stipulated by associated table */
if (markup_track->cell_border) {
unsigned int i;
for (i = 0; i != 4; i++) {
if (!author->border_color[i])
style->border[i].color = markup_track->
border_color;
if (!author->border_width[i]) {
style->border[i].width.width =
CSS_BORDER_WIDTH_LENGTH;
style->border[i].width.value.value = 1;
style->border[i].width.value.unit =
CSS_UNIT_PX;
}
if (!author->border_style[i])
style->border[i].style =
CSS_BORDER_STYLE_INSET;
}
}
/* set any cellpadding stipulated by associated table */
if (markup_track->cell_padding) {
unsigned int i;
for (i = 0; i != 4; i++) {
if (!author->padding[i]) {
style->padding[i].padding =
CSS_PADDING_LENGTH;
style->padding[i].value.length.value =
markup_track->padding_width;
style->padding[i].value.length.unit =
CSS_UNIT_PX;
}
}
}
}
if ((strcmp((const char *) n->name, "img") == 0) ||
(strcmp((const char *) n->name, "image") == 0) ||
(strcmp((const char *) n->name, "applet") == 0)) {
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "hspace"))) {
/* percentage hspace not implemented */
if (!strrchr(s, '%')) {
int value = isdigit(s[0]) ? atoi(s): -1;
if (0 <= value && !author->margin[LEFT]) {
style->margin[LEFT].margin =
CSS_MARGIN_LENGTH;
style->margin[LEFT].value.length.value =
value;
style->margin[LEFT].value.length.unit =
CSS_UNIT_PX;
}
if (0 <= value && !author->margin[RIGHT]) {
style->margin[RIGHT].margin =
CSS_MARGIN_LENGTH;
style->margin[RIGHT].value.length.
value = value;
style->margin[RIGHT].value.length.unit =
CSS_UNIT_PX;
}
}
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "vspace"))) {
/* percentage vspace not implemented */
if (!strrchr(s, '%')) {
int value = isdigit(s[0]) ? atoi(s): -1;
if (0 <= value && !author->margin[TOP]) {
style->margin[TOP].margin =
CSS_MARGIN_LENGTH;
style->margin[TOP].value.length.value =
value;
style->margin[TOP].value.length.unit =
CSS_UNIT_PX;
}
if (0 <= value && !author->margin[BOTTOM]) {
style->margin[BOTTOM].margin =
CSS_MARGIN_LENGTH;
style->margin[BOTTOM].value.length.
value = value;
style->margin[BOTTOM].value.length.
unit = CSS_UNIT_PX;
}
}
xmlFree(s);
}
}
/* Handle markup-originating alignment of block level elements.
* Adjust left and right margins. text-align property is handled in
* the default CSS file.
*/
if (markup_track->align != ALIGN_NONE &&
(style->display == CSS_DISPLAY_BLOCK ||
style->display == CSS_DISPLAY_TABLE) &&
(strcmp((const char *) n->name, "blockquote") != 0)) {
if (!author->margin[LEFT]) {
if (markup_track->align == ALIGN_LEFT) {
/* left */
style->margin[LEFT].margin = CSS_MARGIN_LENGTH;
style->margin[LEFT].value.length.value = 0;
style->margin[LEFT].value.length.unit =
CSS_UNIT_PX;
} else
/* center or right */
style->margin[LEFT].margin = CSS_MARGIN_AUTO;
}
if (!author->margin[RIGHT]) {
if (markup_track->align == ALIGN_RIGHT) {
/* right */
style->margin[RIGHT].margin = CSS_MARGIN_LENGTH;
style->margin[RIGHT].value.length.value= 0;
style->margin[RIGHT].value.length.unit =
CSS_UNIT_PX;
} else
/* left or center */
style->margin[RIGHT].margin = CSS_MARGIN_AUTO;
}
if (author->margin[LEFT] || author->margin[RIGHT]) {
/* author stylesheet sets a margin so stop markup
* alignment model propagation */
markup_track->align = ALIGN_NONE;
}
}
/* Centered tables are a special case. The align attribute only
* affects the current element (table) and overrides any existing
* HTML alignment rule. Tables aligned to left or right are floated
* by the default CSS file. */
if (!author->margin[LEFT] && !author->margin[RIGHT] &&
strcmp((const char *) n->name, "table") == 0) {
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "align"))) {
if (strcasecmp(s, "center") == 0) {
style->margin[LEFT].margin = CSS_MARGIN_AUTO;
style->margin[RIGHT].margin = CSS_MARGIN_AUTO;
}
xmlFree(s);
}
}
box_solve_display(style, !n->parent);
/* Update markup_track with attributes which affect children of
* current box. */
/* Handle html block level element alignment model.
* Note that only margins of block level children are considered,
* text-align for the current block can be handled in the default
* CSS file.
*/
if (strcmp((const char *) n->name, "center") == 0)
markup_track->align = ALIGN_CENTER;
else if (strcmp((const char *) n->name, "div") == 0 ||
strcmp((const char *) n->name, "col") == 0 ||
strcmp((const char *) n->name, "colgroup") == 0 ||
strcmp((const char *) n->name, "tbody") == 0 ||
strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "tfoot") == 0 ||
strcmp((const char *) n->name, "th") == 0 ||
strcmp((const char *) n->name, "thead") == 0 ||
strcmp((const char *) n->name, "tr") == 0) {
if ((s = (char *) xmlGetProp(n, (const xmlChar *) "align"))) {
if (strcasecmp(s, "center") == 0)
markup_track->align = ALIGN_CENTER;
else if (strcasecmp(s, "right") == 0)
markup_track->align = ALIGN_RIGHT;
else if (strcasecmp(s, "left") == 0)
markup_track->align = ALIGN_LEFT;
xmlFree(s);
/* Need to remember if we're in a table, so that any
* alignment rules set on the table's elements won't
* get overridden by the default alignment of a cell
* with no align attribute. At this point, we're in a
* table if the element isn't a div */
if (strcmp((const char *) n->name, "div") != 0)
markup_track->table = true;
}
}
/* Table cells without an align value have a default implied
* alignment. */
if (strcmp((const char *) n->name, "td") == 0 && !markup_track->table) {
if (!(s = (char *) xmlGetProp(n, (const xmlChar *) "align")))
markup_track->align = ALIGN_LEFT;
else
xmlFree(s);
}
if (strcmp((const char *) n->name, "th") == 0 && !markup_track->table) {
if (!(s = (char *) xmlGetProp(n, (const xmlChar *) "align")))
markup_track->align = ALIGN_CENTER;
else
xmlFree(s);
}
/* Some of TABLE's attributes apply to the table cells contained
* within the table. Those details are stored so they may be applied
* to the cells when we get to them. */
if (strcmp((const char *) n->name, "table") == 0) {
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "cellpadding"))) {
char *endp;
long value = strtol(s, &endp, 10);
/* precentage padding width not implemented */
if (*endp == 0 && 0 <= value && value < 1000) {
markup_track->padding_width = value;
markup_track->cell_padding = true;
}
xmlFree(s);
}
if ((s = (char *) xmlGetProp(n,
(const xmlChar *) "border"))) {
int border_width = atoi(s);
markup_track->border_color = border_color;
/* percentage border width not implemented */
if (!strrchr(s, '%') && 0 < border_width) {
markup_track->cell_border = true;
}
xmlFree(s);
}
}
return style;
}
/**
* Calculate 'display' based on 'display', 'position', and 'float', as given
* by CSS 2.1 9.7.
*
* \param style style to update
* \param root this is the root element
*/
void box_solve_display(struct css_style *style, bool root)
{
if (style->display == CSS_DISPLAY_NONE) /* 1. */
return;
else if (style->position == CSS_POSITION_ABSOLUTE ||
style->position == CSS_POSITION_FIXED) /* 2. */
style->float_ = CSS_FLOAT_NONE;
else if (style->float_ != CSS_FLOAT_NONE) /* 3. */
;
else if (root) /* 4. */
;
else /* 5. */
return;
/* 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. */
if ((style->position == CSS_POSITION_ABSOLUTE ||
style->position == CSS_POSITION_FIXED) &&
(style->display == CSS_DISPLAY_INLINE ||
style->display == CSS_DISPLAY_INLINE_BLOCK ||
style->display == CSS_DISPLAY_INLINE_TABLE)) {
style->display = CSS_DISPLAY_INLINE_BLOCK;
return;
}
/* map specified value to computed value using table given in 9.7 */
if (style->display == CSS_DISPLAY_INLINE_TABLE)
style->display = CSS_DISPLAY_TABLE;
else if (style->display == CSS_DISPLAY_LIST_ITEM ||
style->display == CSS_DISPLAY_TABLE)
; /* same as specified */
else
style->display = CSS_DISPLAY_BLOCK;
}
/**
* 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,
css_text_transform 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)
{
content->data.html.background_colour = box->style->background_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 && box->style->display == 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 && box->style->display == 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, markup_track,
author))
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, 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->style->display = CSS_DISPLAY_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->style->display = CSS_DISPLAY_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"))) {
parse_inline_colour(s, &default_border_colour);
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"))) {
parse_inline_colour(s, &frame->border_colour);
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;
/* 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;
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"))) {
parse_inline_colour(s, &iframe->border_colour);
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);
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, markup_track, author,
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->style->display = CSS_DISPLAY_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, markup_track, author))
goto no_memory;
inline_container = box_create(0, 0, 0, 0, 0, content);
if (!inline_container)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(box->style, 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 && box->style->display != 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, markup_track, author,
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(0, 0, 0, 0, 0, content);
if (!inline_container)
return false;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(box->style, 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(0, 0, 0, 0, 0, content);
if (!inline_container)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(box->style, 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(0, 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(box->style, 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(box->style, 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 && box->style->display == 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;
}
/**
* Parse an inline colour string
*/
static void parse_inline_colour(char *s, colour *variable) {
colour new_colour = CSS_COLOR_NONE;
if (s[0] == '#') {
if (strlen(s) == 7)
new_colour = hex_colour(s + 1, 6);
} else {
new_colour = named_colour(s);
}
if (new_colour != CSS_COLOR_NONE)
*variable = new_colour;
}
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