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netsurf/css/select.c
Michael Drake 8e580ccd19 Split out presentational hints handling.
2016-02-05 10:49:58 +00:00

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/*
* Copyright 2009 John-Mark Bell <jmb@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/>.
*/
#include <assert.h>
#include <string.h>
#include <strings.h>
#include "content/urldb.h"
#include "desktop/system_colour.h"
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/log.h"
#include "css/internal.h"
#include "css/hints.h"
#include "css/select.h"
static css_error node_name(void *pw, void *node, css_qname *qname);
static css_error node_classes(void *pw, void *node,
lwc_string ***classes, uint32_t *n_classes);
static css_error node_id(void *pw, void *node, lwc_string **id);
static css_error named_parent_node(void *pw, void *node,
const css_qname *qname, void **parent);
static css_error named_sibling_node(void *pw, void *node,
const css_qname *qname, void **sibling);
static css_error named_generic_sibling_node(void *pw, void *node,
const css_qname *qname, void **sibling);
static css_error parent_node(void *pw, void *node, void **parent);
static css_error sibling_node(void *pw, void *node, void **sibling);
static css_error node_has_name(void *pw, void *node,
const css_qname *qname, bool *match);
static css_error node_has_class(void *pw, void *node,
lwc_string *name, bool *match);
static css_error node_has_id(void *pw, void *node,
lwc_string *name, bool *match);
static css_error node_has_attribute(void *pw, void *node,
const css_qname *qname, bool *match);
static css_error node_has_attribute_equal(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match);
static css_error node_has_attribute_dashmatch(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match);
static css_error node_has_attribute_includes(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match);
static css_error node_has_attribute_prefix(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match);
static css_error node_has_attribute_suffix(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match);
static css_error node_has_attribute_substring(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match);
static css_error node_is_root(void *pw, void *node, bool *match);
static css_error node_count_siblings(void *pw, void *node,
bool same_name, bool after, int32_t *count);
static css_error node_is_empty(void *pw, void *node, bool *match);
static css_error node_is_link(void *pw, void *node, bool *match);
static css_error node_is_hover(void *pw, void *node, bool *match);
static css_error node_is_active(void *pw, void *node, bool *match);
static css_error node_is_focus(void *pw, void *node, bool *match);
static css_error node_is_enabled(void *pw, void *node, bool *match);
static css_error node_is_disabled(void *pw, void *node, bool *match);
static css_error node_is_checked(void *pw, void *node, bool *match);
static css_error node_is_target(void *pw, void *node, bool *match);
static css_error node_is_lang(void *pw, void *node,
lwc_string *lang, bool *match);
static css_error ua_default_for_property(void *pw, uint32_t property,
css_hint *hint);
static css_error set_libcss_node_data(void *pw, void *node,
void *libcss_node_data);
static css_error get_libcss_node_data(void *pw, void *node,
void **libcss_node_data);
static css_error nscss_compute_font_size(void *pw, const css_hint *parent,
css_hint *size);
/**
* Selection callback table for libcss
*/
static css_select_handler selection_handler = {
CSS_SELECT_HANDLER_VERSION_1,
node_name,
node_classes,
node_id,
named_ancestor_node,
named_parent_node,
named_sibling_node,
named_generic_sibling_node,
parent_node,
sibling_node,
node_has_name,
node_has_class,
node_has_id,
node_has_attribute,
node_has_attribute_equal,
node_has_attribute_dashmatch,
node_has_attribute_includes,
node_has_attribute_prefix,
node_has_attribute_suffix,
node_has_attribute_substring,
node_is_root,
node_count_siblings,
node_is_empty,
node_is_link,
node_is_visited,
node_is_hover,
node_is_active,
node_is_focus,
node_is_enabled,
node_is_disabled,
node_is_checked,
node_is_target,
node_is_lang,
node_presentational_hint,
ua_default_for_property,
nscss_compute_font_size,
set_libcss_node_data,
get_libcss_node_data
};
/**
* Create an inline style
*
* \param data Source data
* \param len Length of data in bytes
* \param charset Charset of data, or NULL if unknown
* \param url Base URL of document containing data
* \param allow_quirks True to permit CSS parsing quirks
* \return Pointer to stylesheet, or NULL on failure.
*/
css_stylesheet *nscss_create_inline_style(const uint8_t *data, size_t len,
const char *charset, const char *url, bool allow_quirks)
{
css_stylesheet_params params;
css_stylesheet *sheet;
css_error error;
params.params_version = CSS_STYLESHEET_PARAMS_VERSION_1;
params.level = CSS_LEVEL_DEFAULT;
params.charset = charset;
params.url = url;
params.title = NULL;
params.allow_quirks = allow_quirks;
params.inline_style = true;
params.resolve = nscss_resolve_url;
params.resolve_pw = NULL;
params.import = NULL;
params.import_pw = NULL;
params.color = ns_system_colour;
params.color_pw = NULL;
params.font = NULL;
params.font_pw = NULL;
error = css_stylesheet_create(&params, &sheet);
if (error != CSS_OK) {
LOG("Failed creating sheet: %d", error);
return NULL;
}
error = css_stylesheet_append_data(sheet, data, len);
if (error != CSS_OK && error != CSS_NEEDDATA) {
LOG("failed appending data: %d", error);
css_stylesheet_destroy(sheet);
return NULL;
}
error = css_stylesheet_data_done(sheet);
if (error != CSS_OK) {
LOG("failed completing parse: %d", error);
css_stylesheet_destroy(sheet);
return NULL;
}
return sheet;
}
/* Handler for libcss_node_data, stored as libdom node user data */
static void nscss_dom_user_data_handler(dom_node_operation operation,
dom_string *key, void *data, struct dom_node *src,
struct dom_node *dst)
{
css_error error;
if (dom_string_isequal(corestring_dom___ns_key_libcss_node_data,
key) == false || data == NULL) {
return;
}
switch (operation) {
case DOM_NODE_CLONED:
error = css_libcss_node_data_handler(&selection_handler,
CSS_NODE_CLONED,
NULL, src, dst, data);
if (error != CSS_OK)
LOG("Failed to clone libcss_node_data.");
break;
case DOM_NODE_RENAMED:
error = css_libcss_node_data_handler(&selection_handler,
CSS_NODE_MODIFIED,
NULL, src, NULL, data);
if (error != CSS_OK)
LOG("Failed to update libcss_node_data.");
break;
case DOM_NODE_IMPORTED:
case DOM_NODE_ADOPTED:
case DOM_NODE_DELETED:
error = css_libcss_node_data_handler(&selection_handler,
CSS_NODE_DELETED,
NULL, src, NULL, data);
if (error != CSS_OK)
LOG("Failed to delete libcss_node_data.");
break;
default:
LOG("User data operation not handled.");
assert(0);
}
}
/**
* Get style selection results for an element
*
* \param ctx CSS selection context
* \param n Element to select for
* \param media Permitted media types
* \param inline_style Inline style associated with element, or NULL
* \return Pointer to selection results (containing computed styles),
* or NULL on failure
*/
css_select_results *nscss_get_style(nscss_select_ctx *ctx, dom_node *n,
uint64_t media, const css_stylesheet *inline_style)
{
css_select_results *styles;
int pseudo_element;
css_error error;
/* Select style for node */
error = css_select_style(ctx->ctx, n, media, inline_style,
&selection_handler, ctx, &styles);
if (error != CSS_OK || styles == NULL) {
/* Failed selecting partial style -- bail out */
return NULL;
}
/* If there's a parent style, compose with partial to obtain
* complete computed style for element */
if (ctx->parent_style != NULL) {
/* Complete the computed style, by composing with the parent
* element's style */
error = css_computed_style_compose(ctx->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;
}
/**
* Get an initial style
*
* \param ctx CSS selection context
* \return Pointer to partial computed style, or NULL on failure
*/
static css_computed_style *nscss_get_initial_style(nscss_select_ctx *ctx)
{
css_computed_style *style;
css_error error;
error = css_computed_style_create(&style);
if (error != CSS_OK)
return NULL;
error = css_computed_style_initialise(style, &selection_handler, ctx);
if (error != CSS_OK) {
css_computed_style_destroy(style);
return NULL;
}
return style;
}
/**
* Get a blank style
*
* \param ctx CSS selection context
* \param parent Parent style to cascade inherited properties from
* \return Pointer to blank style, or NULL on failure
*/
css_computed_style *nscss_get_blank_style(nscss_select_ctx *ctx,
const css_computed_style *parent)
{
css_computed_style *partial;
css_error error;
partial = nscss_get_initial_style(ctx);
if (partial == NULL)
return NULL;
error = css_computed_style_compose(parent, partial,
nscss_compute_font_size, NULL, partial);
if (error != CSS_OK) {
css_computed_style_destroy(partial);
return NULL;
}
return partial;
}
/**
* Font size computation callback for libcss
*
* \param pw Computation context
* \param parent Parent font size (absolute)
* \param size Font size to compute
* \return CSS_OK on success
*
* \post \a size will be an absolute font size
*/
css_error nscss_compute_font_size(void *pw, const css_hint *parent,
css_hint *size)
{
/**
* Table of font-size keyword scale factors
*
* These are multiplied by the configured default font size
* to produce an absolute size for the relevant keyword
*/
static const css_fixed factors[] = {
FLTTOFIX(0.5625), /* xx-small */
FLTTOFIX(0.6250), /* x-small */
FLTTOFIX(0.8125), /* small */
FLTTOFIX(1.0000), /* medium */
FLTTOFIX(1.1250), /* large */
FLTTOFIX(1.5000), /* x-large */
FLTTOFIX(2.0000) /* xx-large */
};
css_hint_length parent_size;
/* Grab parent size, defaulting to medium if none */
if (parent == NULL) {
parent_size.value = FDIV(FMUL(factors[CSS_FONT_SIZE_MEDIUM - 1],
INTTOFIX(nsoption_int(font_size))),
INTTOFIX(10));
parent_size.unit = CSS_UNIT_PT;
} else {
assert(parent->status == CSS_FONT_SIZE_DIMENSION);
assert(parent->data.length.unit != CSS_UNIT_EM);
assert(parent->data.length.unit != CSS_UNIT_EX);
assert(parent->data.length.unit != CSS_UNIT_PCT);
parent_size = parent->data.length;
}
assert(size->status != CSS_FONT_SIZE_INHERIT);
if (size->status < CSS_FONT_SIZE_LARGER) {
/* Keyword -- simple */
size->data.length.value = FDIV(FMUL(factors[size->status - 1],
INTTOFIX(nsoption_int(font_size))), F_10);
size->data.length.unit = CSS_UNIT_PT;
} else if (size->status == CSS_FONT_SIZE_LARGER) {
/** \todo Step within table, if appropriate */
size->data.length.value =
FMUL(parent_size.value, FLTTOFIX(1.2));
size->data.length.unit = parent_size.unit;
} else if (size->status == CSS_FONT_SIZE_SMALLER) {
/** \todo Step within table, if appropriate */
size->data.length.value =
FDIV(parent_size.value, FLTTOFIX(1.2));
size->data.length.unit = parent_size.unit;
} else if (size->data.length.unit == CSS_UNIT_EM ||
size->data.length.unit == CSS_UNIT_EX) {
size->data.length.value =
FMUL(size->data.length.value, parent_size.value);
if (size->data.length.unit == CSS_UNIT_EX) {
/* 1ex = 0.6em in NetSurf */
size->data.length.value = FMUL(size->data.length.value,
FLTTOFIX(0.6));
}
size->data.length.unit = parent_size.unit;
} else if (size->data.length.unit == CSS_UNIT_PCT) {
size->data.length.value = FDIV(FMUL(size->data.length.value,
parent_size.value), INTTOFIX(100));
size->data.length.unit = parent_size.unit;
}
size->status = CSS_FONT_SIZE_DIMENSION;
return CSS_OK;
}
/******************************************************************************
* Style selection callbacks *
******************************************************************************/
/**
* Callback to retrieve a node's name.
*
* \param pw HTML document
* \param node DOM node
* \param qname Pointer to location to receive node name
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*/
css_error node_name(void *pw, void *node, css_qname *qname)
{
dom_node *n = node;
dom_string *name;
dom_exception err;
err = dom_node_get_node_name(n, &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
qname->ns = NULL;
err = dom_string_intern(name, &qname->name);
if (err != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_NOMEM;
}
dom_string_unref(name);
return CSS_OK;
}
/**
* Callback to retrieve a node's classes.
*
* \param pw HTML document
* \param node DOM node
* \param classes Pointer to location to receive class name array
* \param n_classes Pointer to location to receive length of class name array
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \note The returned array will be destroyed by libcss. Therefore, it must
* be allocated using the same allocator as used by libcss during style
* selection.
*/
css_error node_classes(void *pw, void *node,
lwc_string ***classes, uint32_t *n_classes)
{
dom_node *n = node;
dom_exception err;
*classes = NULL;
*n_classes = 0;
err = dom_element_get_classes(n, classes, n_classes);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
return CSS_OK;
}
/**
* Callback to retrieve a node's ID.
*
* \param pw HTML document
* \param node DOM node
* \param id Pointer to location to receive id value
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*/
css_error node_id(void *pw, void *node, lwc_string **id)
{
dom_node *n = node;
dom_string *attr;
dom_exception err;
*id = NULL;
/** \todo Assumes an HTML DOM */
err = dom_html_element_get_id(n, &attr);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
if (attr != NULL) {
err = dom_string_intern(attr, id);
if (err != DOM_NO_ERR) {
dom_string_unref(attr);
return CSS_NOMEM;
}
dom_string_unref(attr);
}
return CSS_OK;
}
/**
* Callback to find a named ancestor node.
*
* \param pw HTML document
* \param node DOM node
* \param qname Node name to search for
* \param ancestor Pointer to location to receive ancestor
* \return CSS_OK.
*
* \post \a ancestor will contain the result, or NULL if there is no match
*/
css_error named_ancestor_node(void *pw, void *node,
const css_qname *qname, void **ancestor)
{
dom_element_named_ancestor_node(node, qname->name,
(struct dom_element **)ancestor);
return CSS_OK;
}
/**
* Callback to find a named parent node
*
* \param pw HTML document
* \param node DOM node
* \param qname Node name to search for
* \param parent Pointer to location to receive parent
* \return CSS_OK.
*
* \post \a parent will contain the result, or NULL if there is no match
*/
css_error named_parent_node(void *pw, void *node,
const css_qname *qname, void **parent)
{
dom_element_named_parent_node(node, qname->name,
(struct dom_element **)parent);
return CSS_OK;
}
/**
* Callback to find a named sibling node.
*
* \param pw HTML document
* \param node DOM node
* \param qname Node name to search for
* \param sibling Pointer to location to receive sibling
* \return CSS_OK.
*
* \post \a sibling will contain the result, or NULL if there is no match
*/
css_error named_sibling_node(void *pw, void *node,
const css_qname *qname, void **sibling)
{
dom_node *n = node;
dom_node *prev;
dom_exception err;
*sibling = NULL;
/* Find sibling element */
err = dom_node_get_previous_sibling(n, &n);
if (err != DOM_NO_ERR)
return CSS_OK;
while (n != NULL) {
dom_node_type type;
err = dom_node_get_node_type(n, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
if (type == DOM_ELEMENT_NODE)
break;
err = dom_node_get_previous_sibling(n, &prev);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
dom_node_unref(n);
n = prev;
}
if (n != NULL) {
dom_string *name;
err = dom_node_get_node_name(n, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
dom_node_unref(n);
if (dom_string_caseless_lwc_isequal(name, qname->name)) {
*sibling = n;
}
dom_string_unref(name);
}
return CSS_OK;
}
/**
* Callback to find a named generic sibling node.
*
* \param pw HTML document
* \param node DOM node
* \param qname Node name to search for
* \param sibling Pointer to location to receive ancestor
* \return CSS_OK.
*
* \post \a sibling will contain the result, or NULL if there is no match
*/
css_error named_generic_sibling_node(void *pw, void *node,
const css_qname *qname, void **sibling)
{
dom_node *n = node;
dom_node *prev;
dom_exception err;
*sibling = NULL;
err = dom_node_get_previous_sibling(n, &n);
if (err != DOM_NO_ERR)
return CSS_OK;
while (n != NULL) {
dom_node_type type;
dom_string *name;
err = dom_node_get_node_type(n, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
if (type == DOM_ELEMENT_NODE) {
err = dom_node_get_node_name(n, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
if (dom_string_caseless_lwc_isequal(name,
qname->name)) {
dom_string_unref(name);
dom_node_unref(n);
*sibling = n;
break;
}
dom_string_unref(name);
}
err = dom_node_get_previous_sibling(n, &prev);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
dom_node_unref(n);
n = prev;
}
return CSS_OK;
}
/**
* Callback to retrieve the parent of a node.
*
* \param pw HTML document
* \param node DOM node
* \param parent Pointer to location to receive parent
* \return CSS_OK.
*
* \post \a parent will contain the result, or NULL if there is no match
*/
css_error parent_node(void *pw, void *node, void **parent)
{
dom_element_parent_node(node, (struct dom_element **)parent);
return CSS_OK;
}
/**
* Callback to retrieve the preceding sibling of a node.
*
* \param pw HTML document
* \param node DOM node
* \param sibling Pointer to location to receive sibling
* \return CSS_OK.
*
* \post \a sibling will contain the result, or NULL if there is no match
*/
css_error sibling_node(void *pw, void *node, void **sibling)
{
dom_node *n = node;
dom_node *prev;
dom_exception err;
*sibling = NULL;
/* Find sibling element */
err = dom_node_get_previous_sibling(n, &n);
if (err != DOM_NO_ERR)
return CSS_OK;
while (n != NULL) {
dom_node_type type;
err = dom_node_get_node_type(n, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
if (type == DOM_ELEMENT_NODE)
break;
err = dom_node_get_previous_sibling(n, &prev);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_OK;
}
dom_node_unref(n);
n = prev;
}
if (n != NULL) {
/** \todo Sort out reference counting */
dom_node_unref(n);
*sibling = n;
}
return CSS_OK;
}
/**
* Callback to determine if a node has the given name.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_name(void *pw, void *node,
const css_qname *qname, bool *match)
{
nscss_select_ctx *ctx = pw;
dom_node *n = node;
if (lwc_string_isequal(qname->name, ctx->universal, match) ==
lwc_error_ok && *match == false) {
dom_string *name;
dom_exception err;
err = dom_node_get_node_name(n, &name);
if (err != DOM_NO_ERR)
return CSS_OK;
/* Element names are case insensitive in HTML */
*match = dom_string_caseless_lwc_isequal(name, qname->name);
dom_string_unref(name);
}
return CSS_OK;
}
/**
* Callback to determine if a node has the given class.
*
* \param pw HTML document
* \param node DOM node
* \param name Name to match
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_class(void *pw, void *node,
lwc_string *name, bool *match)
{
dom_node *n = node;
dom_exception err;
/** \todo: Ensure that libdom performs case-insensitive
* matching in quirks mode */
err = dom_element_has_class(n, name, match);
assert(err == DOM_NO_ERR);
return CSS_OK;
}
/**
* Callback to determine if a node has the given id.
*
* \param pw HTML document
* \param node DOM node
* \param name Name to match
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_id(void *pw, void *node,
lwc_string *name, bool *match)
{
dom_node *n = node;
dom_string *attr;
dom_exception err;
*match = false;
/** \todo Assumes an HTML DOM */
err = dom_html_element_get_id(n, &attr);
if (err != DOM_NO_ERR)
return CSS_OK;
if (attr != NULL) {
*match = dom_string_lwc_isequal(attr, name);
dom_string_unref(attr);
}
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with the given name.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute(void *pw, void *node,
const css_qname *qname, bool *match)
{
dom_node *n = node;
dom_string *name;
dom_exception err;
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_has_attribute(n, name, match);
if (err != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_OK;
}
dom_string_unref(name);
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with given name and value.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param value Value to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute_equal(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match)
{
dom_node *n = node;
dom_string *name;
dom_string *atr_val;
dom_exception err;
size_t vlen = lwc_string_length(value);
if (vlen == 0) {
*match = false;
return CSS_OK;
}
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_get_attribute(n, name, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
dom_string_unref(name);
*match = false;
return CSS_OK;
}
dom_string_unref(name);
*match = dom_string_caseless_lwc_isequal(atr_val, value);
dom_string_unref(atr_val);
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with the given name whose
* value dashmatches that given.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param value Value to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute_dashmatch(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match)
{
dom_node *n = node;
dom_string *name;
dom_string *atr_val;
dom_exception err;
size_t vlen = lwc_string_length(value);
if (vlen == 0) {
*match = false;
return CSS_OK;
}
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_get_attribute(n, name, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
dom_string_unref(name);
*match = false;
return CSS_OK;
}
dom_string_unref(name);
/* check for exact match */
*match = dom_string_caseless_lwc_isequal(atr_val, value);
/* check for dashmatch */
if (*match == false) {
const char *vdata = lwc_string_data(value);
const char *data = (const char *) dom_string_data(atr_val);
size_t len = dom_string_byte_length(atr_val);
if (len > vlen && data[vlen] == '-' &&
strncasecmp(data, vdata, vlen) == 0) {
*match = true;
}
}
dom_string_unref(atr_val);
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with the given name whose
* value includes that given.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param value Value to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute_includes(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match)
{
dom_node *n = node;
dom_string *name;
dom_string *atr_val;
dom_exception err;
size_t vlen = lwc_string_length(value);
const char *p;
const char *start;
const char *end;
*match = false;
if (vlen == 0) {
return CSS_OK;
}
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_get_attribute(n, name, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
dom_string_unref(name);
*match = false;
return CSS_OK;
}
dom_string_unref(name);
/* check for match */
start = (const char *) dom_string_data(atr_val);
end = start + dom_string_byte_length(atr_val);
for (p = start; p <= end; p++) {
if (*p == ' ' || *p == '\0') {
if ((size_t) (p - start) == vlen &&
strncasecmp(start,
lwc_string_data(value),
vlen) == 0) {
*match = true;
break;
}
start = p + 1;
}
}
dom_string_unref(atr_val);
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with the given name whose
* value has the prefix given.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param value Value to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute_prefix(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match)
{
dom_node *n = node;
dom_string *name;
dom_string *atr_val;
dom_exception err;
size_t vlen = lwc_string_length(value);
if (vlen == 0) {
*match = false;
return CSS_OK;
}
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_get_attribute(n, name, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
dom_string_unref(name);
*match = false;
return CSS_OK;
}
dom_string_unref(name);
/* check for exact match */
*match = dom_string_caseless_lwc_isequal(atr_val, value);
/* check for prefix match */
if (*match == false) {
const char *data = (const char *) dom_string_data(atr_val);
size_t len = dom_string_byte_length(atr_val);
if ((len >= vlen) &&
(strncasecmp(data, lwc_string_data(value), vlen) == 0)) {
*match = true;
}
}
dom_string_unref(atr_val);
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with the given name whose
* value has the suffix given.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param value Value to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute_suffix(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match)
{
dom_node *n = node;
dom_string *name;
dom_string *atr_val;
dom_exception err;
size_t vlen = lwc_string_length(value);
if (vlen == 0) {
*match = false;
return CSS_OK;
}
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_get_attribute(n, name, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
dom_string_unref(name);
*match = false;
return CSS_OK;
}
dom_string_unref(name);
/* check for exact match */
*match = dom_string_caseless_lwc_isequal(atr_val, value);
/* check for prefix match */
if (*match == false) {
const char *data = (const char *) dom_string_data(atr_val);
size_t len = dom_string_byte_length(atr_val);
const char *start = (char *) data + len - vlen;
if ((len >= vlen) &&
(strncasecmp(start, lwc_string_data(value), vlen) == 0)) {
*match = true;
}
}
dom_string_unref(atr_val);
return CSS_OK;
}
/**
* Callback to determine if a node has an attribute with the given name whose
* value contains the substring given.
*
* \param pw HTML document
* \param node DOM node
* \param qname Name to match
* \param value Value to match
* \param match Pointer to location to receive result
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_has_attribute_substring(void *pw, void *node,
const css_qname *qname, lwc_string *value,
bool *match)
{
dom_node *n = node;
dom_string *name;
dom_string *atr_val;
dom_exception err;
size_t vlen = lwc_string_length(value);
if (vlen == 0) {
*match = false;
return CSS_OK;
}
err = dom_string_create_interned(
(const uint8_t *) lwc_string_data(qname->name),
lwc_string_length(qname->name), &name);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
err = dom_element_get_attribute(n, name, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
dom_string_unref(name);
*match = false;
return CSS_OK;
}
dom_string_unref(name);
/* check for exact match */
*match = dom_string_caseless_lwc_isequal(atr_val, value);
/* check for prefix match */
if (*match == false) {
const char *vdata = lwc_string_data(value);
const char *start = (const char *) dom_string_data(atr_val);
size_t len = dom_string_byte_length(atr_val);
const char *last_start = start + len - vlen;
if (len >= vlen) {
while (start <= last_start) {
if (strncasecmp(start, vdata,
vlen) == 0) {
*match = true;
break;
}
start++;
}
}
}
dom_string_unref(atr_val);
return CSS_OK;
}
/**
* Callback to determine if a node is the root node of the document.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_root(void *pw, void *node, bool *match)
{
dom_node *n = node;
dom_node *parent;
dom_node_type type;
dom_exception err;
err = dom_node_get_parent_node(n, &parent);
if (err != DOM_NO_ERR) {
return CSS_NOMEM;
}
if (parent != NULL) {
err = dom_node_get_node_type(parent, &type);
dom_node_unref(parent);
if (err != DOM_NO_ERR)
return CSS_NOMEM;
if (type != DOM_DOCUMENT_NODE) {
*match = false;
return CSS_OK;
}
}
*match = true;
return CSS_OK;
}
static int
node_count_siblings_check(dom_node *node,
bool check_name,
dom_string *name)
{
dom_node_type type;
int ret = 0;
dom_exception exc;
if (node == NULL)
return 0;
exc = dom_node_get_node_type(node, &type);
if ((exc != DOM_NO_ERR) || (type != DOM_ELEMENT_NODE)) {
return 0;
}
if (check_name) {
dom_string *node_name = NULL;
exc = dom_node_get_node_name(node, &node_name);
if ((exc == DOM_NO_ERR) && (node_name != NULL)) {
if (dom_string_caseless_isequal(name,
node_name)) {
ret = 1;
}
dom_string_unref(node_name);
}
} else {
ret = 1;
}
return ret;
}
/**
* Callback to count a node's siblings.
*
* \param pw HTML document
* \param n DOM node
* \param same_name Only count siblings with the same name, or all
* \param after Count anteceding instead of preceding siblings
* \param count Pointer to location to receive result
* \return CSS_OK.
*
* \post \a count will contain the number of siblings
*/
css_error node_count_siblings(void *pw, void *n, bool same_name,
bool after, int32_t *count)
{
int32_t cnt = 0;
dom_exception exc;
dom_string *node_name = NULL;
if (same_name) {
dom_node *node = n;
exc = dom_node_get_node_name(node, &node_name);
if ((exc != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_NOMEM;
}
}
if (after) {
dom_node *node = dom_node_ref(n);
dom_node *next;
do {
exc = dom_node_get_next_sibling(node, &next);
if ((exc != DOM_NO_ERR))
break;
dom_node_unref(node);
node = next;
cnt += node_count_siblings_check(node, same_name, node_name);
} while (node != NULL);
} else {
dom_node *node = dom_node_ref(n);
dom_node *next;
do {
exc = dom_node_get_previous_sibling(node, &next);
if ((exc != DOM_NO_ERR))
break;
dom_node_unref(node);
node = next;
cnt += node_count_siblings_check(node, same_name, node_name);
} while (node != NULL);
}
if (node_name != NULL) {
dom_string_unref(node_name);
}
*count = cnt;
return CSS_OK;
}
/**
* Callback to determine if a node is empty.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node is empty and false otherwise.
*/
css_error node_is_empty(void *pw, void *node, bool *match)
{
dom_node *n = node, *next;
dom_exception err;
*match = true;
err = dom_node_get_first_child(n, &n);
if (err != DOM_NO_ERR) {
return CSS_BADPARM;
}
while (n != NULL) {
dom_node_type ntype;
err = dom_node_get_node_type(n, &ntype);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_BADPARM;
}
if (ntype == DOM_ELEMENT_NODE ||
ntype == DOM_TEXT_NODE) {
*match = false;
dom_node_unref(n);
break;
}
err = dom_node_get_next_sibling(n, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(n);
return CSS_BADPARM;
}
dom_node_unref(n);
n = next;
}
return CSS_OK;
}
/**
* Callback to determine if a node is a linking element.
*
* \param pw HTML document
* \param n DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_link(void *pw, void *n, bool *match)
{
dom_node *node = n;
dom_exception exc;
dom_string *node_name = NULL;
exc = dom_node_get_node_name(node, &node_name);
if ((exc != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_NOMEM;
}
if (dom_string_caseless_lwc_isequal(node_name, corestring_lwc_a)) {
bool has_href;
exc = dom_element_has_attribute(node, corestring_dom_href,
&has_href);
if ((exc == DOM_NO_ERR) && (has_href)) {
*match = true;
} else {
*match = false;
}
} else {
*match = false;
}
dom_string_unref(node_name);
return CSS_OK;
}
/**
* Callback to determine if a node is a linking element whose target has been
* visited.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_visited(void *pw, void *node, bool *match)
{
nscss_select_ctx *ctx = pw;
nsurl *url;
nserror error;
const struct url_data *data;
dom_exception exc;
dom_node *n = node;
dom_string *s = NULL;
*match = false;
exc = dom_node_get_node_name(n, &s);
if ((exc != DOM_NO_ERR) || (s == NULL)) {
return CSS_NOMEM;
}
if (!dom_string_caseless_lwc_isequal(s, corestring_lwc_a)) {
/* Can't be visited; not ancher element */
dom_string_unref(s);
return CSS_OK;
}
/* Finished with node name string */
dom_string_unref(s);
s = NULL;
exc = dom_element_get_attribute(n, corestring_dom_href, &s);
if ((exc != DOM_NO_ERR) || (s == NULL)) {
/* Can't be visited; not got a URL */
return CSS_OK;
}
/* Make href absolute */
/* TODO: this duplicates what we do for box->href
* should we put the absolute URL on the dom node? */
error = nsurl_join(ctx->base_url, dom_string_data(s), &url);
/* Finished with href string */
dom_string_unref(s);
if (error != NSERROR_OK) {
/* Couldn't make nsurl object */
return CSS_NOMEM;
}
data = urldb_get_url_data(url);
/* Visited if in the db and has
* non-zero visit count */
if (data != NULL && data->visits > 0)
*match = true;
nsurl_unref(url);
return CSS_OK;
}
/**
* Callback to determine if a node is currently being hovered over.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_hover(void *pw, void *node, bool *match)
{
/** \todo Support hovering */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node is currently activated.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_active(void *pw, void *node, bool *match)
{
/** \todo Support active nodes */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node has the input focus.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_focus(void *pw, void *node, bool *match)
{
/** \todo Support focussed nodes */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node is enabled.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match with contain true if the node is enabled and false otherwise.
*/
css_error node_is_enabled(void *pw, void *node, bool *match)
{
/** \todo Support enabled nodes */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node is disabled.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match with contain true if the node is disabled and false otherwise.
*/
css_error node_is_disabled(void *pw, void *node, bool *match)
{
/** \todo Support disabled nodes */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node is checked.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match with contain true if the node is checked and false otherwise.
*/
css_error node_is_checked(void *pw, void *node, bool *match)
{
/** \todo Support checked nodes */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node is the target of the document URL.
*
* \param pw HTML document
* \param node DOM node
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match with contain true if the node matches and false otherwise.
*/
css_error node_is_target(void *pw, void *node, bool *match)
{
/** \todo Support target */
*match = false;
return CSS_OK;
}
/**
* Callback to determine if a node has the given language
*
* \param pw HTML document
* \param node DOM node
* \param lang Language specifier to match
* \param match Pointer to location to receive result
* \return CSS_OK.
*
* \post \a match will contain true if the node matches and false otherwise.
*/
css_error node_is_lang(void *pw, void *node,
lwc_string *lang, bool *match)
{
/** \todo Support languages */
*match = false;
return CSS_OK;
}
/**
* Callback to retrieve the User-Agent defaults for a CSS property.
*
* \param pw HTML document
* \param property Property to retrieve defaults for
* \param hint Pointer to hint object to populate
* \return CSS_OK on success,
* CSS_INVALID if the property should not have a user-agent default.
*/
css_error ua_default_for_property(void *pw, uint32_t property, css_hint *hint)
{
if (property == CSS_PROP_COLOR) {
hint->data.color = 0xff000000;
hint->status = CSS_COLOR_COLOR;
} else if (property == CSS_PROP_FONT_FAMILY) {
hint->data.strings = NULL;
switch (nsoption_int(font_default)) {
case PLOT_FONT_FAMILY_SANS_SERIF:
hint->status = CSS_FONT_FAMILY_SANS_SERIF;
break;
case PLOT_FONT_FAMILY_SERIF:
hint->status = CSS_FONT_FAMILY_SERIF;
break;
case PLOT_FONT_FAMILY_MONOSPACE:
hint->status = CSS_FONT_FAMILY_MONOSPACE;
break;
case PLOT_FONT_FAMILY_CURSIVE:
hint->status = CSS_FONT_FAMILY_CURSIVE;
break;
case PLOT_FONT_FAMILY_FANTASY:
hint->status = CSS_FONT_FAMILY_FANTASY;
break;
}
} else if (property == CSS_PROP_QUOTES) {
/** \todo Not exactly useful :) */
hint->data.strings = NULL;
hint->status = CSS_QUOTES_NONE;
} else if (property == CSS_PROP_VOICE_FAMILY) {
/** \todo Fix this when we have voice-family done */
hint->data.strings = NULL;
hint->status = 0;
} else {
return CSS_INVALID;
}
return CSS_OK;
}
css_error set_libcss_node_data(void *pw, void *node, void *libcss_node_data)
{
dom_node *n = node;
dom_exception err;
void *old_node_data;
/* Set this node's node data */
err = dom_node_set_user_data(n,
corestring_dom___ns_key_libcss_node_data,
libcss_node_data, nscss_dom_user_data_handler,
(void *) &old_node_data);
if (err != DOM_NO_ERR) {
return CSS_NOMEM;
}
assert(old_node_data == NULL);
return CSS_OK;
}
css_error get_libcss_node_data(void *pw, void *node, void **libcss_node_data)
{
dom_node *n = node;
dom_exception err;
/* Get this node's node data */
err = dom_node_get_user_data(n,
corestring_dom___ns_key_libcss_node_data,
libcss_node_data);
if (err != DOM_NO_ERR) {
return CSS_NOMEM;
}
return CSS_OK;
}
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