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netsurf/css/select.c
Michael Drake 35f7f2b9f3 Resolve relative URLs in inline CSS relative to document's base URL, rather than its content URL. 
This means passing the base URL as the URL param to LibCSS's
css_stylesheet_create, rather than the URL of the source of
the style data.
2014-09-18 18:07:52 +01:00

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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 <stdbool.h>
#include <string.h>
#include <strings.h>
#include "content/content_protected.h"
#include "content/urldb.h"
#include "desktop/system_colour.h"
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/log.h"
#include "utils/utils.h"
#include "css/internal.h"
#include "css/select.h"
#include "css/utils.h"
#undef PRINT_NODE_BLOOM_DETAILS
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_ancestor_node(void *pw, void *node,
const css_qname *qname, void **ancestor);
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_visited(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 node_presentational_hint(void *pw, void *node,
uint32_t property, css_hint *hint);
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 int cmp_colour_name(const void *a, const void *b);
static bool parse_named_colour(const char *data, css_color *result);
static bool parse_dimension(const char *data, bool strict,
css_fixed *length, css_unit *unit);
static bool parse_number(const char *data, bool non_negative, bool real,
css_fixed *value, size_t *consumed);
static bool parse_font_size(const char *size, uint8_t *val,
css_fixed *len, css_unit *unit);
static bool isWhitespace(char c);
static bool isHex(char c);
static uint8_t charToHex(char c);
/**
* 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;
}
/**
* Parser for colours specified in attribute values.
*
* \param data Data to parse (NUL-terminated)
* \param result Pointer to location to receive resulting css_color
* \return true on success, false on invalid input
*/
bool nscss_parse_colour(const char *data, css_color *result)
{
size_t len = strlen(data);
uint8_t r, g, b;
/* 2 */
if (len == 0)
return false;
/* 3 */
if (len == SLEN("transparent") && strcasecmp(data, "transparent") == 0)
return false;
/* 4 */
if (parse_named_colour(data, result))
return true;
/** \todo Implement HTML5's utterly insane legacy colour parsing */
if (data[0] == '#') {
data++;
len--;
}
if (len == 3 && isHex(data[0]) && isHex(data[1]) && isHex(data[2])) {
r = charToHex(data[0]);
g = charToHex(data[1]);
b = charToHex(data[2]);
r |= (r << 4);
g |= (g << 4);
b |= (b << 4);
*result = (0xff << 24) | (r << 16) | (g << 8) | b;
return true;
} else if (len == 6 && isHex(data[0]) && isHex(data[1]) &&
isHex(data[2]) && isHex(data[3]) && isHex(data[4]) &&
isHex(data[5])) {
r = (charToHex(data[0]) << 4) | charToHex(data[1]);
g = (charToHex(data[2]) << 4) | charToHex(data[3]);
b = (charToHex(data[4]) << 4) | charToHex(data[5]);
*result = (0xff << 24) | (r << 16) | (g << 8) | b;
return true;
}
return false;
}
/******************************************************************************
* 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 node 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;
}
static css_error
node_presentational_hint_vertical_align(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_string *valign = NULL;
dom_exception err;
err = dom_node_get_node_name(node, &name);
if (err != DOM_NO_ERR)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_col) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_thead) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_tbody) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_tfoot) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_tr) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th)) {
err = dom_element_get_attribute(node,
corestring_dom_valign, &valign);
if (err != DOM_NO_ERR || valign == NULL) {
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_top)) {
hint->status = CSS_VERTICAL_ALIGN_TOP;
} else if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_middle)) {
hint->status = CSS_VERTICAL_ALIGN_MIDDLE;
} else if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_bottom)) {
hint->status = CSS_VERTICAL_ALIGN_BOTTOM;
} else if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_baseline)) {
hint->status = CSS_VERTICAL_ALIGN_BASELINE;
} else {
dom_string_unref(valign);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(valign);
dom_string_unref(name);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_applet) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_embed) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_iframe) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_img) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_object)) {
/** \todo input[type=image][align=*] - $11.3.3 */
err = dom_element_get_attribute(node,
corestring_dom_align, &valign);
if (err != DOM_NO_ERR || valign == NULL) {
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_top)) {
hint->status = CSS_VERTICAL_ALIGN_TOP;
} else if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_bottom) ||
dom_string_caseless_lwc_isequal(valign,
corestring_lwc_baseline)) {
hint->status = CSS_VERTICAL_ALIGN_BASELINE;
} else if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_texttop)) {
hint->status = CSS_VERTICAL_ALIGN_TEXT_TOP;
} else if (dom_string_caseless_lwc_isequal(valign,
corestring_lwc_absmiddle) ||
dom_string_caseless_lwc_isequal(valign,
corestring_lwc_abscenter)) {
hint->status = CSS_VERTICAL_ALIGN_MIDDLE;
} else {
dom_string_unref(valign);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(valign);
dom_string_unref(name);
return CSS_OK;
}
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_text_align(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_string *align = NULL;
dom_exception err;
err = dom_node_get_node_name(node, &name);
if (err != DOM_NO_ERR)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_p) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_h1) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_h2) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_h3) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_h4) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_h5) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_h6)) {
err = dom_element_get_attribute(node,
corestring_dom_align, &align);
if (err != DOM_NO_ERR || align == NULL) {
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->status = CSS_TEXT_ALIGN_LEFT;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_center)) {
hint->status = CSS_TEXT_ALIGN_CENTER;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->status = CSS_TEXT_ALIGN_RIGHT;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_justify)) {
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
} else {
dom_string_unref(align);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(align);
dom_string_unref(name);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_center)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
dom_string_unref(name);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_caption)) {
err = dom_element_get_attribute(node,
corestring_dom_align, &align);
if (err != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
if (align == NULL || dom_string_caseless_lwc_isequal(align,
corestring_lwc_center)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_LEFT;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_RIGHT;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_justify)) {
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
} else {
dom_string_unref(align);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
if (align != NULL)
dom_string_unref(align);
dom_string_unref(name);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_div) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_thead) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_tbody) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_tfoot) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_tr) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name,
corestring_lwc_th)) {
err = dom_element_get_attribute(node,
corestring_dom_align, &align);
if (err != DOM_NO_ERR || align == NULL) {
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_center)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_LEFT;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_RIGHT;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_justify)) {
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
} else {
dom_string_unref(align);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(align);
dom_string_unref(name);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_table)) {
/* Tables usually reset alignment */
hint->status = CSS_TEXT_ALIGN_INHERIT_IF_NON_MAGIC;
dom_string_unref(name);
return CSS_OK;
} else {
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
}
static css_error
node_presentational_hint_padding_trbl(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_exception exc;
dom_string *cellpadding = NULL;
css_error result = CSS_PROPERTY_NOT_SET;
exc = dom_node_get_node_name(node, &name);
if (exc != DOM_NO_ERR)
return CSS_BADPARM;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th)) {
css_qname qs;
dom_node *tablenode = NULL;
qs.ns = NULL;
qs.name = lwc_string_ref(corestring_lwc_table);
if (named_ancestor_node(ctx, node, &qs,
(void *)&tablenode) != CSS_OK) {
/* Didn't find, or had error */
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
lwc_string_unref(qs.name);
if (tablenode != NULL) {
exc = dom_element_get_attribute(tablenode,
corestring_dom_cellpadding,
&cellpadding);
if (exc != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_BADPARM;
}
}
/* No need to unref tablenode, named_ancestor_node does not
* return a reffed node to the CSS
*/
}
dom_string_unref(name);
if (cellpadding != NULL) {
if (parse_dimension(dom_string_data(cellpadding), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_PADDING_SET;
result = CSS_OK;
}
dom_string_unref(cellpadding);
}
return result;
}
static css_error
node_presentational_hint_margin_rl(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint,
uint32_t property)
{
dom_string *n;
dom_exception exc;
exc = dom_node_get_node_name(node, &n);
if (exc != DOM_NO_ERR)
return CSS_BADPARM;
if (dom_string_caseless_lwc_isequal(n, corestring_lwc_img) ||
dom_string_caseless_lwc_isequal(n, corestring_lwc_applet)) {
dom_string_unref(n);
exc = dom_element_get_attribute(node,
corestring_dom_hspace, &n);
if (exc != DOM_NO_ERR) {
return CSS_BADPARM;
}
if (n == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension(dom_string_data(n), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_MARGIN_SET;
} else {
dom_string_unref(n);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(n);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(n, corestring_lwc_table) ||
dom_string_caseless_lwc_isequal(n, corestring_lwc_align)) {
dom_string_unref(n);
exc = dom_element_get_attribute(node,
corestring_dom_align, &n);
if (exc != DOM_NO_ERR) {
return CSS_BADPARM;
}
if (n == NULL)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(n,
corestring_lwc_center) ||
dom_string_caseless_lwc_isequal(n,
corestring_lwc_abscenter) ||
dom_string_caseless_lwc_isequal(n,
corestring_lwc_middle) ||
dom_string_caseless_lwc_isequal(n,
corestring_lwc_absmiddle)) {
hint->status = CSS_MARGIN_AUTO;
} else {
dom_string_unref(n);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(n);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(n, corestring_lwc_hr)) {
dom_string_unref(n);
exc = dom_element_get_attribute(node,
corestring_dom_align, &n);
if (exc != DOM_NO_ERR)
return CSS_BADPARM;
if (n == NULL)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(n,
corestring_lwc_left)) {
if (property == CSS_PROP_MARGIN_LEFT) {
hint->data.length.value = 0;
hint->data.length.unit = CSS_UNIT_PX;
hint->status = CSS_MARGIN_SET;
} else {
hint->status = CSS_MARGIN_AUTO;
}
} else if (dom_string_caseless_lwc_isequal(n,
corestring_lwc_center)) {
hint->status = CSS_MARGIN_AUTO;
} else if (dom_string_caseless_lwc_isequal(n,
corestring_lwc_right)) {
if (property == CSS_PROP_MARGIN_RIGHT) {
hint->data.length.value = 0;
hint->data.length.unit = CSS_UNIT_PX;
hint->status = CSS_MARGIN_SET;
} else {
hint->status = CSS_MARGIN_AUTO;
}
} else {
dom_string_unref(n);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(n);
return CSS_OK;
}
dom_string_unref(n);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_margin_tb(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name, *vspace = NULL;
dom_exception exc;
exc = dom_node_get_node_name(node, &name);
if (exc != DOM_NO_ERR)
return CSS_BADPARM;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_img) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_applet)) {
exc = dom_element_get_attribute(node, corestring_dom_vspace,
&vspace);
if (exc != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_BADPARM;
}
}
dom_string_unref(name);
if (vspace == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension(dom_string_data(vspace), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_MARGIN_SET;
} else {
dom_string_unref(vspace);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(vspace);
return CSS_OK;
}
static css_error
node_presentational_hint_border_trbl_width(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_exception exc;
dom_string *width = NULL;
bool is_table_cell = false;
exc = dom_node_get_node_name(node, &name);
if (exc != DOM_NO_ERR)
return CSS_BADPARM;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th)) {
css_qname qs;
dom_node *tablenode = NULL;
qs.ns = NULL;
qs.name = lwc_string_ref(corestring_lwc_table);
if (named_ancestor_node(ctx, node, &qs,
(void *)&tablenode) != CSS_OK) {
/* Didn't find, or had error */
lwc_string_unref(qs.name);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
lwc_string_unref(qs.name);
if (tablenode != NULL) {
exc = dom_element_get_attribute(tablenode,
corestring_dom_border, &width);
if (exc != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_BADPARM;
}
}
/* No need to unref tablenode, named_ancestor_node does not
* return a reffed node to the CSS
*/
is_table_cell = true;
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_table)) {
exc = dom_element_get_attribute(node, corestring_dom_border,
&width);
if (exc != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_BADPARM;
}
}
dom_string_unref(name);
if (width == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension(dom_string_data(width), false,
&hint->data.length.value,
&hint->data.length.unit)) {
if (is_table_cell &&
INTTOFIX(0) !=
hint->data.length.value) {
hint->data.length.value = INTTOFIX(1);
hint->data.length.unit = CSS_UNIT_PX;
}
hint->status = CSS_BORDER_WIDTH_WIDTH;
} else {
dom_string_unref(width);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(width);
return CSS_OK;
}
static css_error
node_presentational_hint_border_trbl_style(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_exception exc;
exc = dom_node_get_node_name(node, &name);
if (exc != DOM_NO_ERR)
return CSS_BADPARM;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th)) {
css_qname qs;
dom_node *tablenode = NULL;
qs.ns = NULL;
qs.name = lwc_string_ref(corestring_lwc_table);
if (named_ancestor_node(ctx, node, &qs,
(void *)&tablenode) != CSS_OK) {
/* Didn't find, or had error */
lwc_string_unref(qs.name);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
lwc_string_unref(qs.name);
if (tablenode != NULL) {
bool has_border = false;
exc = dom_element_has_attribute(tablenode,
corestring_dom_border,
&has_border);
if (exc != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_BADPARM;
}
if (has_border) {
hint->status = CSS_BORDER_STYLE_INSET;
dom_string_unref(name);
return CSS_OK;
}
}
/* No need to unref tablenode, named_ancestor_node does not
* return a reffed node to the CSS
*/
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_table)) {
bool has_border = false;
exc = dom_element_has_attribute(node,
corestring_dom_border,
&has_border);
if (exc != DOM_NO_ERR) {
dom_string_unref(name);
return CSS_BADPARM;
}
if (has_border) {
hint->status = CSS_BORDER_STYLE_OUTSET;
dom_string_unref(name);
return CSS_OK;
}
}
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_border_trbl_color(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_string *bordercolor = NULL;
dom_exception err;
err = dom_node_get_node_name(node, &name);
if (err != DOM_NO_ERR)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th)) {
css_qname qs;
dom_node *tablenode = NULL;
qs.ns = NULL;
qs.name = lwc_string_ref(corestring_lwc_table);
if (named_ancestor_node(ctx, node, &qs,
(void *)&tablenode) != CSS_OK) {
/* Didn't find, or had error */
lwc_string_unref(qs.name);
dom_string_unref(name);
return CSS_PROPERTY_NOT_SET;
}
lwc_string_unref(qs.name);
if (tablenode != NULL) {
err = dom_element_get_attribute(node,
corestring_dom_bordercolor,
&bordercolor);
}
/* No need to unref tablenode, named_ancestor_node does not
* return a reffed node to the CSS
*/
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_table)) {
err = dom_element_get_attribute(node,
corestring_dom_bordercolor,
&bordercolor);
}
dom_string_unref(name);
if ((err != DOM_NO_ERR) || (bordercolor == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (nscss_parse_colour((const char *)dom_string_data(bordercolor),
&hint->data.color)) {
hint->status = CSS_BORDER_COLOR_COLOR;
dom_string_unref(bordercolor);
return CSS_OK;
}
dom_string_unref(bordercolor);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_border_spacing(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_exception err;
dom_string *node_name = NULL;
dom_string *cellspacing = NULL;
err = dom_node_get_node_name(node, &node_name);
if ((err != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_table)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(node_name);
err = dom_element_get_attribute(node,
corestring_dom_cellspacing, &cellspacing);
if ((err != DOM_NO_ERR) || (cellspacing == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (parse_dimension((const char *)dom_string_data(cellspacing),
false,
&hint->data.position.h.value,
&hint->data.position.h.unit)) {
hint->data.position.v = hint->data.position.h;
hint->status = CSS_BORDER_SPACING_SET;
dom_string_unref(cellspacing);
return CSS_OK;
}
dom_string_unref(cellspacing);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_width(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_string *width = NULL;
dom_exception err;
bool textarea = false;
bool input = false;
err = dom_node_get_node_name(node, &name);
if (err != DOM_NO_ERR)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_hr) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_iframe) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_img) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_object) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_table) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_applet)) {
err = dom_element_get_attribute(node,
corestring_dom_width, &width);
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_textarea)) {
textarea = true;
err = dom_element_get_attribute(node,
corestring_dom_cols, &width);
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_input)) {
input = true;
err = dom_element_get_attribute(node,
corestring_dom_size, &width);
}
dom_string_unref(name);
if ((err != DOM_NO_ERR) || (width == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (parse_dimension((const char *)dom_string_data(width),
false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_WIDTH_SET;
dom_string_unref(width);
if (textarea) {
hint->data.length.unit = CSS_UNIT_EX;
}
if (input) {
err = dom_element_get_attribute(node,
corestring_dom_type, &width);
if (err != DOM_NO_ERR) {
return CSS_PROPERTY_NOT_SET;
}
if ((width == NULL) ||
dom_string_caseless_lwc_isequal(width,
corestring_lwc_text) ||
dom_string_caseless_lwc_isequal(width,
corestring_lwc_search) ||
dom_string_caseless_lwc_isequal(width,
corestring_lwc_file) ||
dom_string_caseless_lwc_isequal(width,
corestring_lwc_password)) {
hint->data.length.unit = CSS_UNIT_EX;
}
dom_string_unref(width);
}
return CSS_OK;
}
dom_string_unref(width);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_height(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_string *name;
dom_string *height = NULL;
dom_exception err;
bool textarea = false;
err = dom_node_get_node_name(node, &name);
if (err != DOM_NO_ERR)
return CSS_PROPERTY_NOT_SET;
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_iframe) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_td) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_th) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_tr) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_img) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_object) ||
dom_string_caseless_lwc_isequal(name, corestring_lwc_applet)) {
err = dom_element_get_attribute(node,
corestring_dom_height, &height);
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_textarea)) {
textarea = true;
err = dom_element_get_attribute(node,
corestring_dom_rows, &height);
}
dom_string_unref(name);
if ((err != DOM_NO_ERR) || (height == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (parse_dimension((const char *)dom_string_data(height),
false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_HEIGHT_SET;
if (textarea) {
hint->data.length.unit = CSS_UNIT_EM;
}
dom_string_unref(height);
return CSS_OK;
}
dom_string_unref(height);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_font_size(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_exception err;
dom_string *node_name = NULL;
dom_string *size;
err = dom_node_get_node_name(node, &node_name);
if ((err != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_NOMEM;
}
if (!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_font)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(node_name);
err = dom_element_get_attribute(node, corestring_dom_size, &size);
if ((err != DOM_NO_ERR) || (size == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (parse_font_size((const char *)dom_string_data(size),
&hint->status,
&hint->data.length.value,
&hint->data.length.unit)) {
dom_string_unref(size);
return CSS_OK;
}
dom_string_unref(size);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_float(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_exception err;
dom_string *node_name = NULL;
dom_string *align;
err = dom_node_get_node_name(node, &node_name);
if ((err != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_NOMEM;
}
/** \todo input[type=image][align=*] - $11.3.3 */
if (!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_applet) &&
!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_embed) &&
!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_iframe) &&
!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_img) &&
!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_object)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(node_name);
err = dom_element_get_attribute(node, corestring_dom_align, &align);
if ((err != DOM_NO_ERR) || (align == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->status = CSS_FLOAT_LEFT;
dom_string_unref(align);
return CSS_OK;
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->status = CSS_FLOAT_RIGHT;
dom_string_unref(align);
return CSS_OK;
}
dom_string_unref(align);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_color(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
css_error error;
dom_exception err;
dom_string *node_name = NULL;
dom_string *color;
err = dom_node_get_node_name(node, &node_name);
if ((err != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_NOMEM;
}
if (dom_string_caseless_lwc_isequal(node_name, corestring_lwc_a)) {
/* find body node */
css_qname qs;
dom_node *bodynode = NULL;
bool is_visited;
qs.ns = NULL;
qs.name = lwc_string_ref(corestring_lwc_body);
if (named_ancestor_node(ctx, node, &qs,
(void *)&bodynode) != CSS_OK) {
/* Didn't find, or had error */
lwc_string_unref(qs.name);
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
lwc_string_unref(qs.name);
/* deal with missing body ancestor */
if (bodynode == NULL) {
dom_string_unref(node_name);
return CSS_BADPARM;
}
error = node_is_visited(ctx, node, &is_visited);
if (error != CSS_OK)
return error;
if (is_visited) {
err = dom_element_get_attribute(bodynode,
corestring_dom_vlink, &color);
if ((err != DOM_NO_ERR) || (color == NULL)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
} else {
err = dom_element_get_attribute(bodynode,
corestring_dom_link, &color);
if ((err != DOM_NO_ERR) || (color == NULL)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
}
} else if (dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_body)) {
err = dom_element_get_attribute(node,
corestring_dom_text, &color);
if ((err != DOM_NO_ERR) || (color == NULL)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
} else {
err = dom_element_get_attribute(node,
corestring_dom_color, &color);
if ((err != DOM_NO_ERR) || (color == NULL)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
}
if (!nscss_parse_colour((const char *)dom_string_data(color),
&hint->data.color)) {
dom_string_unref(color);
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
hint->status = CSS_COLOR_COLOR;
dom_string_unref(color);
dom_string_unref(node_name);
return CSS_OK;
}
static css_error
node_presentational_hint_caption_side(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_exception err;
dom_string *node_name = NULL;
dom_string *align = NULL;
err = dom_node_get_node_name(node, &node_name);
if ((err != DOM_NO_ERR) || (node_name == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (!dom_string_caseless_lwc_isequal(node_name,
corestring_lwc_caption)) {
dom_string_unref(node_name);
return CSS_PROPERTY_NOT_SET;
}
dom_string_unref(node_name);
err = dom_element_get_attribute(node, corestring_dom_align, &align);
if ((err != DOM_NO_ERR) || (align == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (dom_string_caseless_lwc_isequal(align, corestring_lwc_bottom)) {
hint->status = CSS_CAPTION_SIDE_BOTTOM;
dom_string_unref(align);
return CSS_OK;
}
dom_string_unref(align);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_background_color(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_exception err;
dom_string *bgcolor;
err = dom_element_get_attribute(node,
corestring_dom_bgcolor, &bgcolor);
if ((err != DOM_NO_ERR) || (bgcolor == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
if (nscss_parse_colour((const char *)dom_string_data(bgcolor),
&hint->data.color)) {
hint->status = CSS_BACKGROUND_COLOR_COLOR;
dom_string_unref(bgcolor);
return CSS_OK;
}
dom_string_unref(bgcolor);
return CSS_PROPERTY_NOT_SET;
}
static css_error
node_presentational_hint_background_image(nscss_select_ctx *ctx,
dom_node *node,
css_hint *hint)
{
dom_exception err;
dom_string *atr_val;
nserror error;
nsurl *url;
lwc_string *iurl;
lwc_error lerror;
err = dom_element_get_attribute(node,
corestring_dom_background, &atr_val);
if ((err != DOM_NO_ERR) || (atr_val == NULL)) {
return CSS_PROPERTY_NOT_SET;
}
error = nsurl_join(ctx->base_url,
(const char *)dom_string_data(atr_val), &url);
dom_string_unref(atr_val);
if (error != NSERROR_OK) {
return CSS_NOMEM;
}
lerror = lwc_intern_string(nsurl_access(url),
nsurl_length(url), &iurl);
nsurl_unref(url);
if (lerror == lwc_error_oom) {
return CSS_NOMEM;
}
if (lerror == lwc_error_ok) {
hint->data.string = iurl;
hint->status = CSS_BACKGROUND_IMAGE_IMAGE;
return CSS_OK;
}
return CSS_PROPERTY_NOT_SET;
}
/**
* Callback to retrieve presentational hints for a node
*
* \param pw HTML document
* \param node DOM node
* \param property CSS property to retrieve
* \param hint Pointer to hint object to populate
* \return CSS_OK on success,
* CSS_PROPERTY_NOT_SET if there is no hint for the requested property,
* CSS_NOMEM on memory exhaustion.
*/
css_error node_presentational_hint(void *pw, void *node,
uint32_t property, css_hint *hint)
{
switch (property) {
case CSS_PROP_BACKGROUND_IMAGE:
return node_presentational_hint_background_image(pw, node, hint);
case CSS_PROP_BACKGROUND_COLOR:
return node_presentational_hint_background_color(pw, node, hint);
case CSS_PROP_CAPTION_SIDE:
return node_presentational_hint_caption_side(pw, node, hint);
case CSS_PROP_COLOR:
return node_presentational_hint_color(pw, node, hint);
case CSS_PROP_FLOAT:
return node_presentational_hint_float(pw, node, hint);
case CSS_PROP_FONT_SIZE:
return node_presentational_hint_font_size(pw, node, hint);
case CSS_PROP_HEIGHT:
return node_presentational_hint_height(pw, node, hint);
case CSS_PROP_WIDTH:
return node_presentational_hint_width(pw, node, hint);
case CSS_PROP_BORDER_SPACING:
return node_presentational_hint_border_spacing(pw, node, hint);
case CSS_PROP_BORDER_TOP_COLOR :
case CSS_PROP_BORDER_RIGHT_COLOR :
case CSS_PROP_BORDER_BOTTOM_COLOR :
case CSS_PROP_BORDER_LEFT_COLOR :
return node_presentational_hint_border_trbl_color(pw, node, hint);
case CSS_PROP_BORDER_TOP_STYLE :
case CSS_PROP_BORDER_RIGHT_STYLE :
case CSS_PROP_BORDER_BOTTOM_STYLE :
case CSS_PROP_BORDER_LEFT_STYLE :
return node_presentational_hint_border_trbl_style(pw, node, hint);
case CSS_PROP_BORDER_TOP_WIDTH :
case CSS_PROP_BORDER_RIGHT_WIDTH :
case CSS_PROP_BORDER_BOTTOM_WIDTH :
case CSS_PROP_BORDER_LEFT_WIDTH :
return node_presentational_hint_border_trbl_width(pw, node, hint);
case CSS_PROP_MARGIN_TOP :
case CSS_PROP_MARGIN_BOTTOM :
return node_presentational_hint_margin_tb(pw, node, hint);
case CSS_PROP_MARGIN_RIGHT:
case CSS_PROP_MARGIN_LEFT:
return node_presentational_hint_margin_rl(pw, node, hint, property);
case CSS_PROP_PADDING_TOP:
case CSS_PROP_PADDING_RIGHT :
case CSS_PROP_PADDING_BOTTOM :
case CSS_PROP_PADDING_LEFT:
return node_presentational_hint_padding_trbl(pw, node, hint);
case CSS_PROP_TEXT_ALIGN:
return node_presentational_hint_text_align(pw, node, hint);
case CSS_PROP_VERTICAL_ALIGN:
return node_presentational_hint_vertical_align(pw, node, hint);
}
return CSS_PROPERTY_NOT_SET;
}
/**
* 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;
}
/**
* Mapping of colour name to CSS color
*/
struct colour_map {
const char *name;
css_color color;
};
/**
* Name comparator for named colour matching
*
* \param a Name to match
* \param b Colour map entry to consider
* \return 0 on match,
* < 0 if a < b,
* > 0 if b > a.
*/
int cmp_colour_name(const void *a, const void *b)
{
const char *aa = a;
const struct colour_map *bb = b;
return strcasecmp(aa, bb->name);
}
/**
* Parse a named colour
*
* \param name Name to parse
* \param result Pointer to location to receive css_color
* \return true on success, false on invalid input
*/
bool parse_named_colour(const char *name, css_color *result)
{
static const struct colour_map named_colours[] = {
{ "aliceblue", 0xfff0f8ff },
{ "antiquewhite", 0xfffaebd7 },
{ "aqua", 0xff00ffff },
{ "aquamarine", 0xff7fffd4 },
{ "azure", 0xfff0ffff },
{ "beige", 0xfff5f5dc },
{ "bisque", 0xffffe4c4 },
{ "black", 0xff000000 },
{ "blanchedalmond", 0xffffebcd },
{ "blue", 0xff0000ff },
{ "blueviolet", 0xff8a2be2 },
{ "brown", 0xffa52a2a },
{ "burlywood", 0xffdeb887 },
{ "cadetblue", 0xff5f9ea0 },
{ "chartreuse", 0xff7fff00 },
{ "chocolate", 0xffd2691e },
{ "coral", 0xffff7f50 },
{ "cornflowerblue", 0xff6495ed },
{ "cornsilk", 0xfffff8dc },
{ "crimson", 0xffdc143c },
{ "cyan", 0xff00ffff },
{ "darkblue", 0xff00008b },
{ "darkcyan", 0xff008b8b },
{ "darkgoldenrod", 0xffb8860b },
{ "darkgray", 0xffa9a9a9 },
{ "darkgreen", 0xff006400 },
{ "darkgrey", 0xffa9a9a9 },
{ "darkkhaki", 0xffbdb76b },
{ "darkmagenta", 0xff8b008b },
{ "darkolivegreen", 0xff556b2f },
{ "darkorange", 0xffff8c00 },
{ "darkorchid", 0xff9932cc },
{ "darkred", 0xff8b0000 },
{ "darksalmon", 0xffe9967a },
{ "darkseagreen", 0xff8fbc8f },
{ "darkslateblue", 0xff483d8b },
{ "darkslategray", 0xff2f4f4f },
{ "darkslategrey", 0xff2f4f4f },
{ "darkturquoise", 0xff00ced1 },
{ "darkviolet", 0xff9400d3 },
{ "deeppink", 0xffff1493 },
{ "deepskyblue", 0xff00bfff },
{ "dimgray", 0xff696969 },
{ "dimgrey", 0xff696969 },
{ "dodgerblue", 0xff1e90ff },
{ "feldspar", 0xffd19275 },
{ "firebrick", 0xffb22222 },
{ "floralwhite", 0xfffffaf0 },
{ "forestgreen", 0xff228b22 },
{ "fuchsia", 0xffff00ff },
{ "gainsboro", 0xffdcdcdc },
{ "ghostwhite", 0xfff8f8ff },
{ "gold", 0xffffd700 },
{ "goldenrod", 0xffdaa520 },
{ "gray", 0xff808080 },
{ "green", 0xff008000 },
{ "greenyellow", 0xffadff2f },
{ "grey", 0xff808080 },
{ "honeydew", 0xfff0fff0 },
{ "hotpink", 0xffff69b4 },
{ "indianred", 0xffcd5c5c },
{ "indigo", 0xff4b0082 },
{ "ivory", 0xfffffff0 },
{ "khaki", 0xfff0e68c },
{ "lavender", 0xffe6e6fa },
{ "lavenderblush", 0xfffff0f5 },
{ "lawngreen", 0xff7cfc00 },
{ "lemonchiffon", 0xfffffacd },
{ "lightblue", 0xffadd8e6 },
{ "lightcoral", 0xfff08080 },
{ "lightcyan", 0xffe0ffff },
{ "lightgoldenrodyellow", 0xfffafad2 },
{ "lightgray", 0xffd3d3d3 },
{ "lightgreen", 0xff90ee90 },
{ "lightgrey", 0xffd3d3d3 },
{ "lightpink", 0xffffb6c1 },
{ "lightsalmon", 0xffffa07a },
{ "lightseagreen", 0xff20b2aa },
{ "lightskyblue", 0xff87cefa },
{ "lightslateblue", 0xff8470ff },
{ "lightslategray", 0xff778899 },
{ "lightslategrey", 0xff778899 },
{ "lightsteelblue", 0xffb0c4de },
{ "lightyellow", 0xffffffe0 },
{ "lime", 0xff00ff00 },
{ "limegreen", 0xff32cd32 },
{ "linen", 0xfffaf0e6 },
{ "magenta", 0xffff00ff },
{ "maroon", 0xff800000 },
{ "mediumaquamarine", 0xff66cdaa },
{ "mediumblue", 0xff0000cd },
{ "mediumorchid", 0xffba55d3 },
{ "mediumpurple", 0xff9370db },
{ "mediumseagreen", 0xff3cb371 },
{ "mediumslateblue", 0xff7b68ee },
{ "mediumspringgreen", 0xff00fa9a },
{ "mediumturquoise", 0xff48d1cc },
{ "mediumvioletred", 0xffc71585 },
{ "midnightblue", 0xff191970 },
{ "mintcream", 0xfff5fffa },
{ "mistyrose", 0xffffe4e1 },
{ "moccasin", 0xffffe4b5 },
{ "navajowhite", 0xffffdead },
{ "navy", 0xff000080 },
{ "oldlace", 0xfffdf5e6 },
{ "olive", 0xff808000 },
{ "olivedrab", 0xff6b8e23 },
{ "orange", 0xffffa500 },
{ "orangered", 0xffff4500 },
{ "orchid", 0xffda70d6 },
{ "palegoldenrod", 0xffeee8aa },
{ "palegreen", 0xff98fb98 },
{ "paleturquoise", 0xffafeeee },
{ "palevioletred", 0xffdb7093 },
{ "papayawhip", 0xffffefd5 },
{ "peachpuff", 0xffffdab9 },
{ "peru", 0xffcd853f },
{ "pink", 0xffffc0cb },
{ "plum", 0xffdda0dd },
{ "powderblue", 0xffb0e0e6 },
{ "purple", 0xff800080 },
{ "red", 0xffff0000 },
{ "rosybrown", 0xffbc8f8f },
{ "royalblue", 0xff4169e1 },
{ "saddlebrown", 0xff8b4513 },
{ "salmon", 0xfffa8072 },
{ "sandybrown", 0xfff4a460 },
{ "seagreen", 0xff2e8b57 },
{ "seashell", 0xfffff5ee },
{ "sienna", 0xffa0522d },
{ "silver", 0xffc0c0c0 },
{ "skyblue", 0xff87ceeb },
{ "slateblue", 0xff6a5acd },
{ "slategray", 0xff708090 },
{ "slategrey", 0xff708090 },
{ "snow", 0xfffffafa },
{ "springgreen", 0xff00ff7f },
{ "steelblue", 0xff4682b4 },
{ "tan", 0xffd2b48c },
{ "teal", 0xff008080 },
{ "thistle", 0xffd8bfd8 },
{ "tomato", 0xffff6347 },
{ "turquoise", 0xff40e0d0 },
{ "violet", 0xffee82ee },
{ "violetred", 0xffd02090 },
{ "wheat", 0xfff5deb3 },
{ "white", 0xffffffff },
{ "whitesmoke", 0xfff5f5f5 },
{ "yellow", 0xffffff00 },
{ "yellowgreen", 0xff9acd32 }
};
const struct colour_map *entry;
entry = bsearch(name, named_colours,
sizeof(named_colours) / sizeof(named_colours[0]),
sizeof(named_colours[0]),
cmp_colour_name);
if (entry != NULL)
*result = entry->color;
return entry != NULL;
}
/**
* Parse a dimension string
*
* \param data Data to parse (NUL-terminated)
* \param strict Whether to enforce strict parsing rules
* \param length Pointer to location to receive dimension's length
* \param unit Pointer to location to receive dimension's unit
* \return true on success, false on invalid input
*/
bool parse_dimension(const char *data, bool strict, css_fixed *length,
css_unit *unit)
{
size_t len;
size_t read;
css_fixed value;
len = strlen(data);
if (parse_number(data, false, true, &value, &read) == false)
return false;
if (strict && value < INTTOFIX(1))
return false;
*length = value;
if (len > read && data[read] == '%')
*unit = CSS_UNIT_PCT;
else
*unit = CSS_UNIT_PX;
return true;
}
/**
* Parse a number string
*
* \param data Data to parse (NUL-terminated)
* \param maybe_negative Negative numbers permitted
* \param real Floating point numbers permitted
* \param value Pointer to location to receive numeric value
* \param consumed Pointer to location to receive number of input
* bytes consumed
* \return true on success, false on invalid input
*/
bool parse_number(const char *data, bool maybe_negative, bool real,
css_fixed *value, size_t *consumed)
{
size_t len;
const uint8_t *ptr;
int32_t intpart = 0;
int32_t fracpart = 0;
int32_t pwr = 1;
int sign = 1;
*consumed = 0;
len = strlen(data);
ptr = (const uint8_t *) data;
if (len == 0)
return false;
/* Skip leading whitespace */
while (len > 0 && isWhitespace(ptr[0])) {
len--;
ptr++;
}
if (len == 0)
return false;
/* Extract sign, if any */
if (ptr[0] == '+') {
len--;
ptr++;
} else if (ptr[0] == '-' && maybe_negative) {
sign = -1;
len--;
ptr++;
}
if (len == 0)
return false;
/* Must have a digit [0,9] */
if ('0' > ptr[0] || ptr[0] > '9')
return false;
/* Now extract intpart, assuming base 10 */
while (len > 0) {
/* Stop on first non-digit */
if (ptr[0] < '0' || '9' < ptr[0])
break;
/* Prevent overflow of 'intpart'; proper clamping below */
if (intpart < (1 << 22)) {
intpart *= 10;
intpart += ptr[0] - '0';
}
ptr++;
len--;
}
/* And fracpart, again, assuming base 10 */
if (real && len > 1 && ptr[0] == '.' &&
('0' <= ptr[1] && ptr[1] <= '9')) {
ptr++;
len--;
while (len > 0) {
if (ptr[0] < '0' || '9' < ptr[0])
break;
if (pwr < 1000000) {
pwr *= 10;
fracpart *= 10;
fracpart += ptr[0] - '0';
}
ptr++;
len--;
}
fracpart = ((1 << 10) * fracpart + pwr/2) / pwr;
if (fracpart >= (1 << 10)) {
intpart++;
fracpart &= (1 << 10) - 1;
}
}
if (sign > 0) {
/* If the result is larger than we can represent,
* then clamp to the maximum value we can store. */
if (intpart >= (1 << 21)) {
intpart = (1 << 21) - 1;
fracpart = (1 << 10) - 1;
}
} else {
/* If the negated result is smaller than we can represent
* then clamp to the minimum value we can store. */
if (intpart >= (1 << 21)) {
intpart = -(1 << 21);
fracpart = 0;
} else {
intpart = -intpart;
if (fracpart) {
fracpart = (1 << 10) - fracpart;
intpart--;
}
}
}
*value = (intpart << 10) | fracpart;
*consumed = ptr - (const uint8_t *) data;
return true;
}
/**
* Parse a font \@size attribute
*
* \param size Data to parse (NUL-terminated)
* \param val Pointer to location to receive enum value
* \param len Pointer to location to receive length
* \param unit Pointer to location to receive unit
* \return True on success, false on failure
*/
bool parse_font_size(const char *size, uint8_t *val,
css_fixed *len, css_unit *unit)
{
static const uint8_t size_map[] = {
CSS_FONT_SIZE_XX_SMALL,
CSS_FONT_SIZE_SMALL,
CSS_FONT_SIZE_MEDIUM,
CSS_FONT_SIZE_LARGE,
CSS_FONT_SIZE_X_LARGE,
CSS_FONT_SIZE_XX_LARGE,
CSS_FONT_SIZE_DIMENSION /* xxx-large (see below) */
};
const char *p = size;
char mode;
int value = 0;
/* Skip whitespace */
while (*p != '\0' && isWhitespace(*p))
p++;
mode = *p;
/* Skip +/- */
if (mode == '+' || mode == '-')
p++;
/* Need at least one digit */
if (*p < '0' || *p > '9') {
return false;
}
/* Consume digits, computing value */
while ('0' <= *p && *p <= '9') {
value = value * 10 + (*p - '0');
p++;
}
/* Resolve relative sizes */
if (mode == '+')
value += 3;
else if (mode == '-')
value = 3 - value;
/* Clamp to range [1,7] */
if (value < 1)
value = 1;
else if (value > 7)
value = 7;
if (value == 7) {
/* Manufacture xxx-large */
*len = FDIV(FMUL(INTTOFIX(3), INTTOFIX(nsoption_int(font_size))),
F_10);
} else {
/* Len is irrelevant */
*len = 0;
}
*unit = CSS_UNIT_PT;
*val = size_map[value - 1];
return true;
}
/******************************************************************************
* Utility functions *
******************************************************************************/
/**
* Determine if a given character is whitespace
*
* \param c Character to consider
* \return true if character is whitespace, false otherwise
*/
bool isWhitespace(char c)
{
return c == ' ' || c == '\t' || c == '\f' || c == '\r' || c == '\n';
}
/**
* Determine if a given character is a valid hex digit
*
* \param c Character to consider
* \return true if character is a valid hex digit, false otherwise
*/
bool isHex(char c)
{
return ('0' <= c && c <= '9') ||
('A' <= (c & ~0x20) && (c & ~0x20) <= 'F');
}
/**
* Convert a character representing a hex digit to the corresponding hex value
*
* \param c Character to convert
* \return Hex value represented by character
*
* \note This function assumes an ASCII-compatible character set
*/
uint8_t charToHex(char c)
{
/* 0-9 */
c -= '0';
/* A-F */
if (c > 9)
c -= 'A' - '9' - 1;
/* a-f */
if (c > 15)
c -= 'a' - 'A';
return c;
}
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