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netsurf/css/select.c
John Mark Bell cf561c8a6e Sync selection engine binding with latest libcss 
svn path=/trunk/netsurf/; revision=11561
2011-01-31 08:49:39 +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 <stdbool.h>
#include <string.h>
#include <strings.h>
#include "content/content_protected.h"
#include "content/urldb.h"
#include "css/internal.h"
#include "css/select.h"
#include "css/utils.h"
#include "desktop/gui.h"
#include "desktop/options.h"
#include "utils/log.h"
#include "utils/url.h"
#include "utils/utils.h"
static css_error node_name(void *pw, void *node, lwc_string **name);
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,
lwc_string *name, void **ancestor);
static css_error named_parent_node(void *pw, void *node,
lwc_string *name, void **parent);
static css_error named_sibling_node(void *pw, void *node,
lwc_string *name, void **sibling);
static css_error named_generic_sibling_node(void *pw, void *node,
lwc_string *name, 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,
lwc_string *name, 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,
lwc_string *name, bool *match);
static css_error node_has_attribute_equal(void *pw, void *node,
lwc_string *name, lwc_string *value,
bool *match);
static css_error node_has_attribute_dashmatch(void *pw, void *node,
lwc_string *name, lwc_string *value,
bool *match);
static css_error node_has_attribute_includes(void *pw, void *node,
lwc_string *name, lwc_string *value,
bool *match);
static css_error node_has_attribute_prefix(void *pw, void *node,
lwc_string *name, lwc_string *value,
bool *match);
static css_error node_has_attribute_suffix(void *pw, void *node,
lwc_string *name, lwc_string *value,
bool *match);
static css_error node_has_attribute_substring(void *pw, void *node,
lwc_string *name, 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 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 css_computed_style *nscss_get_initial_style(struct content *html,
css_allocator_fn, void *pw);
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 = {
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
};
/**
* 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 URL of document containing data
* \param allow_quirks True to permit CSS parsing quirks
* \param alloc Memory allocation function
* \param pw Private word for allocator
* \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_allocator_fn alloc, void *pw)
{
css_stylesheet_params params;
css_stylesheet *sheet;
css_error error;
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 = gui_system_colour;
params.color_pw = NULL;
error = css_stylesheet_create(&params, alloc, pw, &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;
}
/**
* Get a style selection results (partial computed styles) for an element
*
* \param html HTML document
* \param n Element to select for
* \param media Permitted media types
* \param inline_style Inline style associated with element, or NULL
* \param alloc Memory allocation function
* \param pw Private word for allocator
* \return Pointer to selection results (containing partial computed styles),
* or NULL on failure
*/
css_select_results *nscss_get_style(struct content *html, xmlNode *n,
uint64_t media, const css_stylesheet *inline_style,
css_allocator_fn alloc, void *pw)
{
css_select_results *styles;
css_error error;
assert(html->type == CONTENT_HTML);
error = css_select_style(html->data.html.select_ctx, n, media,
inline_style, &selection_handler, html, &styles);
if (error != CSS_OK) {
return NULL;
}
return styles;
}
/**
* Get an initial style
*
* \param html HTML document
* \param alloc Memory allocation function
* \param pw Private word for allocator
* \return Pointer to partial computed style, or NULL on failure
*/
css_computed_style *nscss_get_initial_style(struct content *html,
css_allocator_fn alloc, void *pw)
{
css_computed_style *style;
css_error error;
assert(html->type == CONTENT_HTML);
error = css_computed_style_create(alloc, pw, &style);
if (error != CSS_OK)
return NULL;
error = css_computed_style_initialise(style, &selection_handler, html);
if (error != CSS_OK) {
css_computed_style_destroy(style);
return NULL;
}
return style;
}
/**
* Get a blank style
*
* \param html HTML document
* \param parent Parent style to cascade inherited properties from
* \param alloc Memory allocation function
* \param pw Private word for allocator
* \return Pointer to blank style, or NULL on failure
*/
css_computed_style *nscss_get_blank_style(struct content *html,
const css_computed_style *parent,
css_allocator_fn alloc, void *pw)
{
css_computed_style *partial;
css_error error;
assert(html->type == CONTENT_HTML);
partial = nscss_get_initial_style(html, alloc, pw);
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 = FDIVI(
FMULI(factors[CSS_FONT_SIZE_MEDIUM - 1],
option_font_size), 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 = FDIVI(
FMULI(factors[size->status - 1],
option_font_size), 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 name 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, lwc_string **name)
{
xmlNode *n = node;
lwc_error lerror;
lerror = lwc_intern_string((const char *) n->name,
strlen((const char *) n->name), name);
switch (lerror) {
case lwc_error_oom:
return CSS_NOMEM;
case lwc_error_range:
assert(0);
default:
break;
}
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)
{
xmlNode *n = node;
xmlAttr *class;
xmlChar *value = NULL;
const char *p;
const char *start;
lwc_string **result = NULL;
uint32_t items = 0;
lwc_error lerror;
css_error error = CSS_OK;
*classes = NULL;
*n_classes = 0;
/* See if there is a class attribute on this node */
class = xmlHasProp(n, (const xmlChar *) "class");
if (class == NULL)
return CSS_OK;
/* We have a class attribute -- extract its value */
if (class->children != NULL && class->children->next == NULL &&
class->children->children == NULL) {
/* Simple case -- no XML entities */
start = (const char *) class->children->content;
} else {
/* Awkward case -- fall back to string copying */
value = xmlGetProp(n, (const xmlChar *) "class");
if (value == NULL)
return CSS_OK;
start = (const char *) value;
}
/* The class attribute is a space separated list of tokens. */
do {
lwc_string **temp;
/* Find next space or end of string */
p = strchrnul(start, ' ');
temp = realloc(result, (items + 1) * sizeof(lwc_string *));
if (temp == NULL) {
error = CSS_NOMEM;
goto cleanup;
}
result = temp;
lerror = lwc_intern_string(start, p - start, &result[items]);
switch (lerror) {
case lwc_error_oom:
error = CSS_NOMEM;
goto cleanup;
case lwc_error_range:
assert(0);
default:
break;
}
items++;
/* Move to start of next token in string */
start = p + 1;
} while (*p != '\0');
/* Clean up, if necessary */
if (value != NULL) {
xmlFree(value);
}
*classes = result;
*n_classes = items;
return CSS_OK;
cleanup:
if (result != NULL) {
uint32_t i;
for (i = 0; i < items; i++)
lwc_string_unref(result[i]);
free(result);
}
if (value != NULL) {
xmlFree(value);
}
return error;
}
/**
* 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)
{
xmlNode *n = node;
xmlAttr *attr;
xmlChar *value = NULL;
const char *start;
lwc_error lerror;
css_error error = CSS_OK;
*id = NULL;
/* See if there's an id attribute on this node */
attr = xmlHasProp(n, (const xmlChar *) "id");
if (attr == NULL)
return CSS_OK;
/* We have an id attribute -- extract its value */
if (attr->children != NULL && attr->children->next == NULL &&
attr->children->children == NULL) {
/* Simple case -- no XML entities */
start = (const char *) attr->children->content;
} else {
/* Awkward case -- fall back to string copying */
value = xmlGetProp(n, (const xmlChar *) "id");
if (value == NULL)
return CSS_OK;
start = (const char *) value;
}
/* Intern value */
lerror = lwc_intern_string(start, strlen(start), id);
switch (lerror) {
case lwc_error_oom:
error = CSS_NOMEM;
break;
case lwc_error_range:
assert(0);
break;
default:
break;
}
/* Clean up if necessary */
if (value != NULL) {
xmlFree(value);
}
return error;
}
/**
* Callback to find a named ancestor node.
*
* \param pw HTML document
* \param node DOM node
* \param name 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,
lwc_string *name, void **ancestor)
{
xmlNode *n = node;
size_t len = lwc_string_length(name);
const char *data = lwc_string_data(name);
*ancestor = NULL;
for (n = n->parent; n != NULL && n->type == XML_ELEMENT_NODE;
n = n->parent) {
bool match = strlen((const char *) n->name) == len &&
strncasecmp((const char *) n->name,
data, len) == 0;
if (match) {
*ancestor = (void *) n;
break;
}
}
return CSS_OK;
}
/**
* Callback to find a named parent node
*
* \param pw HTML document
* \param node DOM node
* \param name 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,
lwc_string *name, void **parent)
{
xmlNode *n = node;
size_t len = lwc_string_length(name);
const char *data = lwc_string_data(name);
*parent = NULL;
if (n->parent != NULL && n->parent->type == XML_ELEMENT_NODE &&
strlen((const char *) n->parent->name) == len &&
strncasecmp((const char *) n->parent->name,
data, len) == 0)
*parent = (void *) n->parent;
return CSS_OK;
}
/**
* Callback to find a named sibling node.
*
* \param pw HTML document
* \param node DOM node
* \param name 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,
lwc_string *name, void **sibling)
{
xmlNode *n = node;
size_t len = lwc_string_length(name);
const char *data = lwc_string_data(name);
*sibling = NULL;
while (n->prev != NULL && n->prev->type != XML_ELEMENT_NODE)
n = n->prev;
if (n->prev != NULL && strlen((const char *) n->prev->name) == len &&
strncasecmp((const char *) n->prev->name,
data, len) == 0)
*sibling = (void *) n->prev;
return CSS_OK;
}
/**
* Callback to find a named generic sibling node.
*
* \param pw HTML document
* \param node DOM node
* \param name 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,
lwc_string *name, void **sibling)
{
xmlNode *n = node;
size_t len = lwc_string_length(name);
const char *data = lwc_string_data(name);
*sibling = NULL;
for (n = n->prev; n != NULL && n->type == XML_ELEMENT_NODE;
n = n->prev) {
bool match = strlen((const char *) n->name) == len &&
strncasecmp((const char *) n->name,
data, len) == 0;
if (match) {
*sibling = (void *) n;
break;
}
}
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)
{
xmlNode *n = node;
if (n->parent != NULL && n->parent->type == XML_ELEMENT_NODE)
*parent = (void *) n->parent;
else
*parent = NULL;
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)
{
xmlNode *n = node;
while (n->prev != NULL && n->prev->type != XML_ELEMENT_NODE)
n = n->prev;
*sibling = (void *) n->prev;
return CSS_OK;
}
/**
* Callback to determine if a node has the given name.
*
* \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_name(void *pw, void *node,
lwc_string *name, bool *match)
{
xmlNode *n = node;
size_t len = lwc_string_length(name);
const char *data = lwc_string_data(name);
/* Element names are case insensitive in HTML */
*match = strlen((const char *) n->name) == len &&
strncasecmp((const char *) n->name, data, len) == 0;
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)
{
struct content *html = pw;
xmlNode *n = node;
xmlAttr *class;
xmlChar *value = NULL;
const char *p;
const char *start;
const char *data;
size_t len;
int (*cmp)(const char *, const char *, size_t);
/* Class names are case insensitive in quirks mode */
if (html->data.html.quirks == BINDING_QUIRKS_MODE_FULL)
cmp = strncasecmp;
else
cmp = strncmp;
*match = false;
/* See if there is a class attribute on this node */
class = xmlHasProp(n, (const xmlChar *) "class");
if (class == NULL)
return CSS_OK;
/* We have a class attribute -- extract its value */
if (class->children != NULL && class->children->next == NULL &&
class->children->children == NULL) {
/* Simple case -- no XML entities */
start = (const char *) class->children->content;
} else {
/* Awkward case -- fall back to string copying */
value = xmlGetProp(n, (const xmlChar *) "class");
if (value == NULL)
return CSS_OK;
start = (const char *) value;
}
/* Extract expected class name data */
data = lwc_string_data(name);
len = lwc_string_length(name);
/* The class attribute is a space separated list of tokens.
* Search it for the one we're looking for.
*/
do {
/* Find next space or end of string */
p = strchrnul(start, ' ');
/* Does it match? */
if ((size_t) (p - start) == len && cmp(start, data, len) == 0) {
*match = true;
break;
}
/* Move to start of next token in string */
start = p + 1;
} while (*p != '\0');
/* Clean up, if necessary */
if (value != NULL) {
xmlFree(value);
}
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)
{
xmlNode *n = node;
xmlAttr *id;
xmlChar *value = NULL;
const char *start;
const char *data;
size_t len;
*match = false;
/* See if there's an id attribute on this node */
id = xmlHasProp(n, (const xmlChar *) "id");
if (id == NULL)
return CSS_OK;
/* We have an id attribute -- extract its value */
if (id->children != NULL && id->children->next == NULL &&
id->children->children == NULL) {
/* Simple case -- no XML entities */
start = (const char *) id->children->content;
} else {
/* Awkward case -- fall back to string copying */
value = xmlGetProp(n, (const xmlChar *) "id");
if (value == NULL)
return CSS_OK;
start = (const char *) value;
}
/* Extract expected id data */
len = lwc_string_length(name);
data = lwc_string_data(name);
/* Compare */
*match = strlen(start) == len && strncmp(start, data, len) == 0;
/* Clean up if necessary */
if (value != NULL) {
xmlFree(value);
}
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 name 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,
lwc_string *name, bool *match)
{
xmlNode *n = node;
xmlAttr *attr;
attr = xmlHasProp(n, (const xmlChar *) lwc_string_data(name));
*match = attr != NULL;
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 name 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,
lwc_string *name, lwc_string *value,
bool *match)
{
xmlNode *n = node;
xmlChar *attr;
*match = false;
attr = xmlGetProp(n, (const xmlChar *) lwc_string_data(name));
if (attr != NULL) {
*match = strlen((const char *) attr) ==
lwc_string_length(value) &&
strncasecmp((const char *) attr,
lwc_string_data(value),
lwc_string_length(value)) == 0;
xmlFree(attr);
}
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 name 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,
lwc_string *name, lwc_string *value,
bool *match)
{
xmlNode *n = node;
xmlChar *attr;
size_t vlen = lwc_string_length(value);
*match = false;
attr = xmlGetProp(n, (const xmlChar *) lwc_string_data(name));
if (attr != NULL) {
const char *p;
const char *start = (const char *) attr;
const char *end = start + strlen(start);
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;
}
}
xmlFree(attr);
}
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 name 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,
lwc_string *name, lwc_string *value,
bool *match)
{
xmlNode *n = node;
xmlChar *attr;
size_t vlen = lwc_string_length(value);
*match = false;
attr = xmlGetProp(n, (const xmlChar *) lwc_string_data(name));
if (attr != NULL) {
const char *p;
const char *start = (const char *) attr;
const char *end = start + strlen(start);
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;
}
}
xmlFree(attr);
}
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 name 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,
lwc_string *name, lwc_string *value,
bool *match)
{
xmlNode *n = node;
xmlChar *attr;
size_t vlen = lwc_string_length(value);
*match = false;
attr = xmlGetProp(n, (const xmlChar *) lwc_string_data(name));
if (attr != NULL) {
if (strlen((char *) attr) >= vlen && strncasecmp((char *) attr,
lwc_string_data(value), vlen) == 0)
*match = true;
xmlFree(attr);
}
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 name 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,
lwc_string *name, lwc_string *value,
bool *match)
{
xmlNode *n = node;
xmlChar *attr;
size_t vlen = lwc_string_length(value);
*match = false;
attr = xmlGetProp(n, (const xmlChar *) lwc_string_data(name));
if (attr != NULL) {
size_t len = strlen((char *) attr);
const char *start = (char *) attr + len - vlen;
if (len >= vlen && strncasecmp(start,
lwc_string_data(value), vlen) == 0)
*match = true;
xmlFree(attr);
}
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 name 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,
lwc_string *name, lwc_string *value,
bool *match)
{
xmlNode *n = node;
xmlChar *attr;
size_t vlen = lwc_string_length(value);
*match = false;
attr = xmlGetProp(n, (const xmlChar *) lwc_string_data(name));
if (attr != NULL) {
const char *vdata = lwc_string_data(value);
size_t len = strlen((char *) attr);
const char *start = (char *) attr;
const char *last_start = start + len - vlen;
if (len >= vlen) {
while (start <= last_start) {
if (strncasecmp(start, vdata, vlen) == 0) {
*match = true;
break;
}
start++;
}
}
xmlFree(attr);
}
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)
{
xmlNode *n = node;
*match = (n->parent != NULL);
return CSS_OK;
}
/**
* 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 *node, bool same_name,
bool after, int32_t *count)
{
xmlNode *n = node;
const char *name = (char *) n->name;
int32_t cnt = 0;
do {
n = after ? n->next : n->prev;
if (n != NULL && n->type != XML_ELEMENT_NODE) {
if (same_name) {
if (strcasecmp(name, (char *) n->name) == 0)
cnt++;
} else {
cnt++;
}
}
} while (n != NULL);
*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)
{
xmlNode *n = node;
/** \todo This may not be sufficient: all children may be
* non-content, or empty content nodes. */
*match = (n->children == NULL);
return CSS_OK;
}
/**
* Callback to determine if a node is a linking element.
*
* \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_link(void *pw, void *node, bool *match)
{
xmlNode *n = node;
*match = (strcasecmp((const char *) n->name, "a") == 0 &&
xmlHasProp(n, (const xmlChar *) "href") != NULL);
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)
{
*match = false;
/** \todo Implement visted check in a more performant way */
#ifdef SUPPORT_VISITED
struct content *html = pw;
xmlNode *n = node;
if (strcasecmp((const char *) n->name, "a") == 0) {
char *url, *nurl;
url_func_result res;
xmlChar *href = xmlGetProp(n, (const xmlChar *) "href");
if (href == NULL)
return CSS_OK;
/* Make href absolute */
res = url_join((const char *) href,
html->data.html.base_url, &url);
xmlFree(href);
if (res == URL_FUNC_NOMEM) {
return CSS_NOMEM;
} else if (res == URL_FUNC_OK) {
/* Normalize it */
res = url_normalize(url, &nurl);
free(url);
if (res == URL_FUNC_NOMEM) {
return CSS_NOMEM;
} else if (res == URL_FUNC_OK) {
const struct url_data *data;
data = urldb_get_url_data(nurl);
/* Visited if in the db and has
* non-zero visit count */
if (data != NULL && data->visits > 0)
*match = true;
free(nurl);
}
}
}
#endif
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 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)
{
struct content *html = pw;
xmlNode *n = node;
if (property == CSS_PROP_BACKGROUND_IMAGE) {
char *url;
url_func_result res;
xmlChar *bg = xmlGetProp(n, (const xmlChar *) "background");
if (bg == NULL)
return CSS_PROPERTY_NOT_SET;
res = url_join((const char *) bg,
html->data.html.base_url, &url);
xmlFree(bg);
if (res == URL_FUNC_NOMEM) {
return CSS_NOMEM;
} else if (res == URL_FUNC_OK) {
lwc_string *iurl;
lwc_error lerror;
lerror = lwc_intern_string(url, strlen(url), &iurl);
free(url);
if (lerror == lwc_error_oom) {
return CSS_NOMEM;
} else if (lerror == lwc_error_ok) {
hint->data.string = iurl;
hint->status = CSS_BACKGROUND_IMAGE_IMAGE;
return CSS_OK;
}
}
} else if (property == CSS_PROP_BACKGROUND_COLOR) {
xmlChar *bgcol = xmlGetProp(n, (const xmlChar *) "bgcolor");
if (bgcol == NULL)
return CSS_PROPERTY_NOT_SET;
if (nscss_parse_colour((const char *) bgcol,
&hint->data.color)) {
hint->status = CSS_BACKGROUND_COLOR_COLOR;
} else {
xmlFree(bgcol);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(bgcol);
return CSS_OK;
} else if (property == CSS_PROP_CAPTION_SIDE) {
xmlChar *align = NULL;
if (strcmp((const char *) n->name, "caption") == 0)
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) align, "bottom") == 0) {
hint->status = CSS_CAPTION_SIDE_BOTTOM;
} else {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(align);
return CSS_OK;
} else if (property == CSS_PROP_COLOR) {
xmlChar *col;
css_error error;
bool is_link, is_visited;
error = node_is_link(html, n, &is_link);
if (error != CSS_OK)
return error;
if (is_link) {
xmlNode *body;
for (body = n; body != NULL && body->parent != NULL &&
body->parent->parent != NULL;
body = body->parent) {
if (body->parent->parent->parent == NULL)
break;
}
error = node_is_visited(html, n, &is_visited);
if (error != CSS_OK)
return error;
if (is_visited)
col = xmlGetProp(body,
(const xmlChar *) "vlink");
else
col = xmlGetProp(body,
(const xmlChar *) "link");
} else if (strcmp((const char *) n->name, "body") == 0) {
col = xmlGetProp(n, (const xmlChar *) "text");
} else {
col = xmlGetProp(n, (const xmlChar *) "color");
}
if (col == NULL)
return CSS_PROPERTY_NOT_SET;
if (nscss_parse_colour((const char *) col, &hint->data.color)) {
hint->status = CSS_COLOR_COLOR;
} else {
xmlFree(col);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(col);
return CSS_OK;
} else if (property == CSS_PROP_FLOAT) {
xmlChar *align = NULL;
/** \todo input[type=image][align=*] - $11.3.3 */
if (strcmp((const char *) n->name, "table") == 0 ||
strcmp((const char *) n->name, "applet") == 0 ||
strcmp((const char *) n->name, "embed") == 0 ||
strcmp((const char *) n->name, "iframe") == 0 ||
strcmp((const char *) n->name, "img") == 0 ||
strcmp((const char *) n->name, "object") == 0)
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) align, "left") == 0) {
hint->status = CSS_FLOAT_LEFT;
} else if (strcasecmp((const char *) align, "right") == 0) {
hint->status = CSS_FLOAT_RIGHT;
} else {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(align);
return CSS_OK;
} else if (property == CSS_PROP_HEIGHT) {
xmlChar *height;
if (strcmp((const char *) n->name, "iframe") == 0 ||
strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0 ||
strcmp((const char *) n->name, "tr") == 0 ||
strcmp((const char *) n->name, "img") == 0 ||
strcmp((const char *) n->name, "object") == 0 ||
strcmp((const char *) n->name, "applet") == 0)
height = xmlGetProp(n, (const xmlChar *) "height");
else if (strcmp((const char *) n->name, "textarea") == 0)
height = xmlGetProp(n, (const xmlChar *) "rows");
else
height = NULL;
if (height == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) height, false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_HEIGHT_SET;
} else {
xmlFree(height);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(height);
if (strcmp((const char *) n->name, "textarea") == 0)
hint->data.length.unit = CSS_UNIT_EM;
return CSS_OK;
} else if (property == CSS_PROP_WIDTH) {
xmlChar *width;
if (strcmp((const char *) n->name, "hr") == 0 ||
strcmp((const char *) n->name, "iframe") == 0 ||
strcmp((const char *) n->name, "img") == 0 ||
strcmp((const char *) n->name, "object") == 0 ||
strcmp((const char *) n->name, "table") == 0 ||
strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0 ||
strcmp((const char *) n->name, "applet") == 0)
width = xmlGetProp(n, (const xmlChar *) "width");
else if (strcmp((const char *) n->name, "textarea") == 0)
width = xmlGetProp(n, (const xmlChar *) "cols");
else if (strcmp((const char *) n->name, "input") == 0) {
width = xmlGetProp(n, (const xmlChar *) "size");
} else
width = NULL;
if (width == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) width, false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_WIDTH_SET;
} else {
xmlFree(width);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(width);
if (strcmp((const char *) n->name, "textarea") == 0)
hint->data.length.unit = CSS_UNIT_EX;
else if (strcmp((const char *) n->name, "input") == 0) {
xmlChar *type = xmlGetProp(n, (const xmlChar *) "type");
if (type == NULL || strcasecmp((const char *) type,
"text") == 0 ||
strcasecmp((const char *) type,
"password") == 0)
hint->data.length.unit = CSS_UNIT_EX;
else {
xmlFree(type);
return CSS_PROPERTY_NOT_SET;
}
if (type != NULL)
xmlFree(type);
}
return CSS_OK;
} else if (property == CSS_PROP_BORDER_SPACING) {
xmlChar *cellspacing;
if (strcmp((const char *) n->name, "table") != 0)
return CSS_PROPERTY_NOT_SET;
cellspacing = xmlGetProp(n, (const xmlChar *) "cellspacing");
if (cellspacing == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) 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;
} else {
xmlFree(cellspacing);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(cellspacing);
return CSS_OK;
} else if (property == CSS_PROP_BORDER_TOP_COLOR ||
property == CSS_PROP_BORDER_RIGHT_COLOR ||
property == CSS_PROP_BORDER_BOTTOM_COLOR ||
property == CSS_PROP_BORDER_LEFT_COLOR) {
xmlChar *col;
if (strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
/* Find table */
for (n = n->parent; n != NULL &&
n->type == XML_ELEMENT_NODE;
n = n->parent) {
if (strcmp((const char *) n->name, "table") ==
0)
break;
}
if (n == NULL)
return CSS_PROPERTY_NOT_SET;
}
if (strcmp((const char *) n->name, "table") == 0)
col = xmlGetProp(n, (const xmlChar *) "bordercolor");
else
col = NULL;
if (col == NULL)
return CSS_PROPERTY_NOT_SET;
if (nscss_parse_colour((const char *) col, &hint->data.color)) {
hint->status = CSS_BORDER_COLOR_COLOR;
} else {
xmlFree(col);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(col);
return CSS_OK;
} else if (property == CSS_PROP_BORDER_TOP_STYLE ||
property == CSS_PROP_BORDER_RIGHT_STYLE ||
property == CSS_PROP_BORDER_BOTTOM_STYLE ||
property == CSS_PROP_BORDER_LEFT_STYLE) {
bool is_table_cell = false;
if (strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
is_table_cell = true;
/* Find table */
for (n = n->parent; n != NULL &&
n->type == XML_ELEMENT_NODE;
n = n->parent) {
if (strcmp((const char *) n->name, "table") ==
0)
break;
}
if (n == NULL)
return CSS_PROPERTY_NOT_SET;
}
if (strcmp((const char *) n->name, "table") == 0 &&
xmlHasProp(n,
(const xmlChar *) "border") != NULL) {
if (is_table_cell)
hint->status = CSS_BORDER_STYLE_INSET;
else
hint->status = CSS_BORDER_STYLE_OUTSET;
return CSS_OK;
}
} else if (property == CSS_PROP_BORDER_TOP_WIDTH ||
property == CSS_PROP_BORDER_RIGHT_WIDTH ||
property == CSS_PROP_BORDER_BOTTOM_WIDTH ||
property == CSS_PROP_BORDER_LEFT_WIDTH) {
xmlChar *width;
bool is_table_cell = false;
if (strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
is_table_cell = true;
/* Find table */
for (n = n->parent; n != NULL &&
n->type == XML_ELEMENT_NODE;
n = n->parent) {
if (strcmp((const char *) n->name, "table") ==
0)
break;
}
if (n == NULL)
return CSS_PROPERTY_NOT_SET;
}
if (strcmp((const char *) n->name, "table") == 0)
width = xmlGetProp(n, (const xmlChar *) "border");
else
width = NULL;
if (width == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) 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 {
xmlFree(width);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(width);
return CSS_OK;
} else if (property == CSS_PROP_MARGIN_TOP ||
property == CSS_PROP_MARGIN_BOTTOM) {
xmlChar *vspace;
if (strcmp((const char *) n->name, "img") == 0 ||
strcmp((const char *) n->name, "applet") == 0)
vspace = xmlGetProp(n, (const xmlChar *) "vspace");
else
vspace = NULL;
if (vspace == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) vspace, false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_MARGIN_SET;
} else {
xmlFree(vspace);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(vspace);
return CSS_OK;
} else if (property == CSS_PROP_MARGIN_RIGHT ||
property == CSS_PROP_MARGIN_LEFT) {
xmlChar *hspace = NULL;
xmlChar *align = NULL;
if (strcmp((const char *) n->name, "img") == 0 ||
strcmp((const char *) n->name, "applet") == 0) {
hspace = xmlGetProp(n, (const xmlChar *) "hspace");
if (hspace == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) hspace, false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_MARGIN_SET;
} else {
xmlFree(hspace);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(hspace);
return CSS_OK;
} else if (strcmp((const char *) n->name, "table") == 0) {
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) align, "center") == 0 ||
strcasecmp((const char *) align,
"abscenter") == 0 ||
strcasecmp((const char *) align,
"middle") == 0 ||
strcasecmp((const char *) align,
"absmiddle") == 0) {
hint->status = CSS_MARGIN_AUTO;
} else {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(align);
return CSS_OK;
} else if (strcmp((const char *) n->name, "hr") == 0) {
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) align, "left") == 0) {
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 (strcasecmp((const char *) align,
"center") == 0) {
hint->status = CSS_MARGIN_AUTO;
} else if (strcasecmp((const char *) align,
"right") == 0) {
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 {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(align);
return CSS_OK;
}
} else if (property == CSS_PROP_PADDING_TOP ||
property == CSS_PROP_PADDING_RIGHT ||
property == CSS_PROP_PADDING_BOTTOM ||
property == CSS_PROP_PADDING_LEFT) {
xmlChar *cellpadding = NULL;
if (strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
/* Find table */
for (n = n->parent; n != NULL &&
n->type == XML_ELEMENT_NODE;
n = n->parent) {
if (strcmp((const char *) n->name, "table") ==
0)
break;
}
if (n != NULL)
cellpadding = xmlGetProp(n,
(const xmlChar *) "cellpadding");
}
if (cellpadding == NULL)
return CSS_PROPERTY_NOT_SET;
if (parse_dimension((const char *) cellpadding, false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->status = CSS_PADDING_SET;
} else {
xmlFree(cellpadding);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(cellpadding);
return CSS_OK;
} else if (property == CSS_PROP_TEXT_ALIGN) {
xmlChar *align = NULL;
if (strcmp((const char *) n->name, "p") == 0 ||
strcmp((const char *) n->name, "h1") == 0 ||
strcmp((const char *) n->name, "h2") == 0 ||
strcmp((const char *) n->name, "h3") == 0 ||
strcmp((const char *) n->name, "h4") == 0 ||
strcmp((const char *) n->name, "h5") == 0 ||
strcmp((const char *) n->name, "h6") == 0) {
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) align, "left") == 0) {
hint->status = CSS_TEXT_ALIGN_LEFT;
} else if (strcasecmp((const char *) align,
"center") == 0) {
hint->status = CSS_TEXT_ALIGN_CENTER;
} else if (strcasecmp((const char *) align,
"right") == 0) {
hint->status = CSS_TEXT_ALIGN_RIGHT;
} else if (strcasecmp((const char *) align,
"justify") == 0) {
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
} else {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(align);
return CSS_OK;
} else if (strcmp((const char *) n->name, "center") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
return CSS_OK;
} else if (strcmp((const char *) n->name, "caption") == 0) {
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL || strcasecmp((const char *) align,
"center") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
} else if (strcasecmp((const char *) align,
"left") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_LEFT;
} else if (strcasecmp((const char *) align,
"right") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_RIGHT;
} else if (strcasecmp((const char *) align,
"justify") == 0) {
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
} else {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
if (align != NULL)
xmlFree(align);
return CSS_OK;
} else if (strcmp((const char *) n->name, "div") == 0 ||
strcmp((const char *) n->name, "thead") == 0 ||
strcmp((const char *) n->name, "tbody") == 0 ||
strcmp((const char *) n->name, "tfoot") == 0 ||
strcmp((const char *) n->name, "tr") == 0 ||
strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
align = xmlGetProp(n, (const xmlChar *) "align");
if (align == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) align, "center") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
} else if (strcasecmp((const char *) align,
"left") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_LEFT;
} else if (strcasecmp((const char *) align,
"right") == 0) {
hint->status = CSS_TEXT_ALIGN_LIBCSS_RIGHT;
} else if (strcasecmp((const char *) align,
"justify") == 0) {
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
} else {
xmlFree(align);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(align);
return CSS_OK;
} else if (strcmp((const char *) n->name, "table") == 0) {
/* Tables usually reset alignment */
hint->status = CSS_TEXT_ALIGN_INHERIT_IF_NON_MAGIC;
return CSS_OK;
} else {
return CSS_PROPERTY_NOT_SET;
}
} else if (property == CSS_PROP_VERTICAL_ALIGN) {
xmlChar *valign = NULL;
if (strcmp((const char *) n->name, "col") == 0 ||
strcmp((const char *) n->name, "thead") == 0 ||
strcmp((const char *) n->name, "tbody") == 0 ||
strcmp((const char *) n->name, "tfoot") == 0 ||
strcmp((const char *) n->name, "tr") == 0 ||
strcmp((const char *) n->name, "td") == 0 ||
strcmp((const char *) n->name, "th") == 0) {
valign = xmlGetProp(n, (const xmlChar *) "valign");
if (valign == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) valign, "top") == 0) {
hint->status = CSS_VERTICAL_ALIGN_TOP;
} else if (strcasecmp((const char *) valign,
"middle") == 0) {
hint->status = CSS_VERTICAL_ALIGN_MIDDLE;
} else if (strcasecmp((const char *) valign,
"bottom") == 0) {
hint->status = CSS_VERTICAL_ALIGN_BOTTOM;
} else if (strcasecmp((const char *) valign,
"baseline") == 0) {
hint->status = CSS_VERTICAL_ALIGN_BASELINE;
} else {
xmlFree(valign);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(valign);
return CSS_OK;
} else if (strcmp((const char *) n->name, "applet") == 0 ||
strcmp((const char *) n->name, "embed") == 0 ||
strcmp((const char *) n->name, "iframe") == 0 ||
strcmp((const char *) n->name, "img") == 0 ||
strcmp((const char *) n->name, "object") == 0) {
/** \todo input[type=image][align=*] - $11.3.3 */
valign = xmlGetProp(n, (const xmlChar *) "align");
if (valign == NULL)
return CSS_PROPERTY_NOT_SET;
if (strcasecmp((const char *) valign, "top") == 0) {
hint->status = CSS_VERTICAL_ALIGN_TOP;
} else if (strcasecmp((const char *) valign,
"bottom") == 0 ||
strcasecmp((const char *) valign,
"baseline") == 0) {
hint->status = CSS_VERTICAL_ALIGN_BASELINE;
} else if (strcasecmp((const char *) valign,
"texttop") == 0) {
hint->status = CSS_VERTICAL_ALIGN_TEXT_TOP;
} else if (strcasecmp((const char *) valign,
"absmiddle") == 0 ||
strcasecmp((const char *) valign,
"abscenter") == 0) {
hint->status = CSS_VERTICAL_ALIGN_MIDDLE;
} else {
xmlFree(valign);
return CSS_PROPERTY_NOT_SET;
}
xmlFree(valign);
return CSS_OK;
}
}
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 (option_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;
}
/**
* 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;
}
/******************************************************************************
* 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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