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netsurf/content/handlers/css/hints.c

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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 <string.h>
#include <strings.h>
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/log.h"
#include "utils/nsurl.h"
#include "utils/utils.h"
#include "css/hints.h"
#include "css/select.h"
#define LOG_STATS
#undef LOG_STATS
/******************************************************************************
* Utility functions *
******************************************************************************/
/**
* Determine if a given character is whitespace
*
* \param c Character to consider
* \return true if character is whitespace, false otherwise
*/
static 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
*/
static 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
*/
static 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;
}
/******************************************************************************
* Common parsing functions *
******************************************************************************/
/**
* 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
*/
static 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 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
*/
static 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;
}
/**
* 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.
*/
static 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
*/
static 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;
}
/* exported interface documented in content/handlers/css/hints.h */
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;
}
/**
* 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
*/
static 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;
}
/******************************************************************************
* Hint context management *
******************************************************************************/
#define MAX_HINTS_PER_ELEMENT 32
struct css_hint_ctx {
struct css_hint *hints;
uint32_t len;
};
struct css_hint_ctx hint_ctx;
nserror css_hint_init(void)
{
hint_ctx.hints = malloc(sizeof(struct css_hint) *
MAX_HINTS_PER_ELEMENT);
if (hint_ctx.hints == NULL) {
return NSERROR_NOMEM;
}
return NSERROR_OK;
}
void css_hint_fini(void)
{
hint_ctx.len = 0;
free(hint_ctx.hints);
}
static void css_hint_clean(void)
{
hint_ctx.len = 0;
}
static inline void css_hint_advance(struct css_hint **hint)
{
hint_ctx.len++;
assert(hint_ctx.len < MAX_HINTS_PER_ELEMENT);
(*hint)++;
}
static void css_hint_get_hints(struct css_hint **hints, uint32_t *nhints)
{
*hints = hint_ctx.hints;
*nhints = hint_ctx.len;
}
/******************************************************************************
* Presentational hint handlers *
******************************************************************************/
static void css_hint_table_cell_border_padding(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
css_qname qs;
dom_string *attr = NULL;
dom_node *tablenode = NULL;
dom_exception exc;
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);
return;
}
lwc_string_unref(qs.name);
if (tablenode == NULL) {
return;
}
/* No need to unref tablenode, named_ancestor_node does not
* return a reffed node to the CSS
*/
exc = dom_element_get_attribute(tablenode,
corestring_dom_border, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
uint32_t hint_prop;
css_hint_length hint_length;
if (parse_dimension(
dom_string_data(attr), false,
&hint_length.value,
&hint_length.unit) &&
INTTOFIX(0) != hint_length.value) {
for (hint_prop = CSS_PROP_BORDER_TOP_STYLE;
hint_prop <= CSS_PROP_BORDER_LEFT_STYLE;
hint_prop++) {
hint->prop = hint_prop;
hint->status = CSS_BORDER_STYLE_INSET;
css_hint_advance(&hint);
}
for (hint_prop = CSS_PROP_BORDER_TOP_WIDTH;
hint_prop <= CSS_PROP_BORDER_LEFT_WIDTH;
hint_prop++) {
hint->prop = hint_prop;
hint->data.length.value = INTTOFIX(1);
hint->data.length.unit = CSS_UNIT_PX;
hint->status = CSS_BORDER_WIDTH_WIDTH;
css_hint_advance(&hint);
}
}
dom_string_unref(attr);
}
exc = dom_element_get_attribute(tablenode,
corestring_dom_bordercolor, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
uint32_t hint_prop;
css_color hint_color;
if (nscss_parse_colour(
(const char *)dom_string_data(attr),
&hint_color)) {
for (hint_prop = CSS_PROP_BORDER_TOP_COLOR;
hint_prop <= CSS_PROP_BORDER_LEFT_COLOR;
hint_prop++) {
hint->prop = hint_prop;
hint->data.color = hint_color;
hint->status = CSS_BORDER_COLOR_COLOR;
css_hint_advance(&hint);
}
}
dom_string_unref(attr);
}
exc = dom_element_get_attribute(tablenode,
corestring_dom_cellpadding, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
uint32_t hint_prop;
css_hint_length hint_length;
if (parse_dimension(
dom_string_data(attr), false,
&hint_length.value,
&hint_length.unit)) {
for (hint_prop = CSS_PROP_PADDING_TOP;
hint_prop <= CSS_PROP_PADDING_LEFT;
hint_prop++) {
hint->prop = hint_prop;
hint->data.length.value = hint_length.value;
hint->data.length.unit = hint_length.unit;
hint->status = CSS_PADDING_SET;
css_hint_advance(&hint);
}
}
dom_string_unref(attr);
}
}
static void css_hint_vertical_align_table_cells(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_valign, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
hint->data.length.value = 0;
hint->data.length.unit = CSS_UNIT_PX;
if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_top)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_TOP;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_middle)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_MIDDLE;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_bottom)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_BOTTOM;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_baseline)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_BASELINE;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_vertical_align_replaced(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_valign, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_top)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_TOP;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_bottom) ||
dom_string_caseless_lwc_isequal(attr,
corestring_lwc_baseline)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_BASELINE;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_texttop)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_TEXT_TOP;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_absmiddle) ||
dom_string_caseless_lwc_isequal(attr,
corestring_lwc_abscenter)) {
hint->prop = CSS_PROP_VERTICAL_ALIGN;
hint->status = CSS_VERTICAL_ALIGN_MIDDLE;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_text_align_normal(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *align = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_align, &align);
if (err == DOM_NO_ERR && align != NULL) {
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_LEFT;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_center)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_CENTER;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_RIGHT;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_justify)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
css_hint_advance(&hint);
}
dom_string_unref(align);
}
}
static void css_hint_text_align_center(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
css_hint_advance(&hint);
}
static void css_hint_margin_left_right_align_center(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr;
dom_exception exc;
exc = dom_element_get_attribute(node,
corestring_dom_align, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
memset(hint, 0, sizeof(*hint) * 2);
if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_center) ||
dom_string_caseless_lwc_isequal(attr,
corestring_lwc_abscenter) ||
dom_string_caseless_lwc_isequal(attr,
corestring_lwc_middle) ||
dom_string_caseless_lwc_isequal(attr,
corestring_lwc_absmiddle)) {
hint->prop = CSS_PROP_MARGIN_LEFT;
hint->status = CSS_MARGIN_AUTO;
css_hint_advance(&hint);
hint->prop = CSS_PROP_MARGIN_RIGHT;
hint->status = CSS_MARGIN_AUTO;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_text_align_special(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *align = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_align, &align);
if (err == DOM_NO_ERR && align != NULL) {
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_center)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_LIBCSS_CENTER;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_LIBCSS_LEFT;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_LIBCSS_RIGHT;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_justify)) {
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_JUSTIFY;
css_hint_advance(&hint);
}
dom_string_unref(align);
}
}
static void css_hint_text_align_table_special(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
hint->prop = CSS_PROP_TEXT_ALIGN;
hint->status = CSS_TEXT_ALIGN_INHERIT_IF_NON_MAGIC;
css_hint_advance(&hint);
}
static void css_hint_margin_hspace_vspace(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr = NULL;
dom_exception exc;
exc = dom_element_get_attribute(node,
corestring_dom_vspace, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
css_hint_length hint_length;
if (parse_dimension(
dom_string_data(attr), false,
&hint_length.value,
&hint_length.unit)) {
hint->prop = CSS_PROP_MARGIN_TOP;
hint->data.length.value = hint_length.value;
hint->data.length.unit = hint_length.unit;
hint->status = CSS_MARGIN_SET;
css_hint_advance(&hint);
hint->prop = CSS_PROP_MARGIN_BOTTOM;
hint->data.length.value = hint_length.value;
hint->data.length.unit = hint_length.unit;
hint->status = CSS_MARGIN_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
exc = dom_element_get_attribute(node,
corestring_dom_hspace, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
css_hint_length hint_length;
if (parse_dimension(
dom_string_data(attr), false,
&hint_length.value,
&hint_length.unit)) {
hint->prop = CSS_PROP_MARGIN_LEFT;
hint->data.length.value = hint_length.value;
hint->data.length.unit = hint_length.unit;
hint->status = CSS_MARGIN_SET;
css_hint_advance(&hint);
hint->prop = CSS_PROP_MARGIN_RIGHT;
hint->data.length.value = hint_length.value;
hint->data.length.unit = hint_length.unit;
hint->status = CSS_MARGIN_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_margin_left_right_hr(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr;
dom_exception exc;
exc = dom_element_get_attribute(node,
corestring_dom_align, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
memset(hint, 0, sizeof(*hint) * 2);
if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_left)) {
hint->prop = CSS_PROP_MARGIN_LEFT;
hint->data.length.value = 0;
hint->data.length.unit = CSS_UNIT_PX;
hint->status = CSS_MARGIN_SET;
css_hint_advance(&hint);
hint->prop = CSS_PROP_MARGIN_RIGHT;
hint->status = CSS_MARGIN_AUTO;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_center)) {
hint->prop = CSS_PROP_MARGIN_LEFT;
hint->status = CSS_MARGIN_AUTO;
css_hint_advance(&hint);
hint->prop = CSS_PROP_MARGIN_RIGHT;
hint->status = CSS_MARGIN_AUTO;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(attr,
corestring_lwc_right)) {
hint->prop = CSS_PROP_MARGIN_LEFT;
hint->status = CSS_MARGIN_AUTO;
css_hint_advance(&hint);
hint->prop = CSS_PROP_MARGIN_RIGHT;
hint->data.length.value = 0;
hint->data.length.unit = CSS_UNIT_PX;
hint->status = CSS_MARGIN_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_table_spacing_border(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception exc;
dom_string *attr = NULL;
exc = dom_element_get_attribute(node, corestring_dom_border, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
uint32_t hint_prop;
css_hint_length hint_length;
for (hint_prop = CSS_PROP_BORDER_TOP_STYLE;
hint_prop <= CSS_PROP_BORDER_LEFT_STYLE;
hint_prop++) {
hint->prop = hint_prop;
hint->status = CSS_BORDER_STYLE_OUTSET;
css_hint_advance(&hint);
}
if (parse_dimension(
dom_string_data(attr), false,
&hint_length.value,
&hint_length.unit)) {
for (hint_prop = CSS_PROP_BORDER_TOP_WIDTH;
hint_prop <= CSS_PROP_BORDER_LEFT_WIDTH;
hint_prop++) {
hint->prop = hint_prop;
hint->data.length.value = hint_length.value;
hint->data.length.unit = hint_length.unit;
hint->status = CSS_BORDER_WIDTH_WIDTH;
css_hint_advance(&hint);
}
}
dom_string_unref(attr);
}
exc = dom_element_get_attribute(node,
corestring_dom_bordercolor, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
uint32_t hint_prop;
css_color hint_color;
if (nscss_parse_colour(
(const char *)dom_string_data(attr),
&hint_color)) {
for (hint_prop = CSS_PROP_BORDER_TOP_COLOR;
hint_prop <= CSS_PROP_BORDER_LEFT_COLOR;
hint_prop++) {
hint->prop = hint_prop;
hint->data.color = hint_color;
hint->status = CSS_BORDER_COLOR_COLOR;
css_hint_advance(&hint);
}
}
dom_string_unref(attr);
}
exc = dom_element_get_attribute(node,
corestring_dom_cellspacing, &attr);
if (exc == DOM_NO_ERR && attr != NULL) {
if (parse_dimension(
(const char *)dom_string_data(attr), false,
&hint->data.position.h.value,
&hint->data.position.h.unit)) {
hint->prop = CSS_PROP_BORDER_SPACING;
hint->data.position.v = hint->data.position.h;
hint->status = CSS_BORDER_SPACING_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_height(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_height, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
if (parse_dimension(
(const char *)dom_string_data(attr), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->prop = CSS_PROP_HEIGHT;
hint->status = CSS_HEIGHT_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_width(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_width, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
if (parse_dimension(
(const char *)dom_string_data(attr), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->prop = CSS_PROP_WIDTH;
hint->status = CSS_WIDTH_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_height_width_textarea(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_string *attr = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_rows, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
if (parse_dimension(
(const char *)dom_string_data(attr), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->prop = CSS_PROP_HEIGHT;
hint->data.length.unit = CSS_UNIT_EM;
hint->status = CSS_HEIGHT_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
err = dom_element_get_attribute(node,
corestring_dom_cols, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
if (parse_dimension(
(const char *)dom_string_data(attr), false,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->prop = CSS_PROP_WIDTH;
hint->data.length.unit = CSS_UNIT_EX;
hint->status = CSS_WIDTH_SET;
css_hint_advance(&hint);
}
dom_string_unref(attr);
}
}
static void css_hint_width_input(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &(hint_ctx.hints[hint_ctx.len]);
dom_string *attr = NULL;
dom_exception err;
err = dom_element_get_attribute(node,
corestring_dom_size, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
if (parse_dimension(
(const char *)dom_string_data(attr), false,
&hint->data.length.value,
&hint->data.length.unit)) {
dom_string *attr2 = NULL;
err = dom_element_get_attribute(node,
corestring_dom_type, &attr2);
if (err == DOM_NO_ERR) {
hint->prop = CSS_PROP_WIDTH;
hint->status = CSS_WIDTH_SET;
if (attr2 == NULL ||
dom_string_caseless_lwc_isequal(
attr2,
corestring_lwc_text) ||
dom_string_caseless_lwc_isequal(
attr2,
corestring_lwc_search) ||
dom_string_caseless_lwc_isequal(
attr2,
corestring_lwc_password) ||
dom_string_caseless_lwc_isequal(
attr2,
corestring_lwc_file)) {
hint->data.length.unit = CSS_UNIT_EX;
}
if (attr2 != NULL) {
dom_string_unref(attr2);
}
css_hint_advance(&hint);
}
}
dom_string_unref(attr);
}
}
static void css_hint_anchor_color(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
css_error error;
dom_exception err;
dom_string *color;
dom_node *bodynode = NULL;
/* find body node */
css_qname qs;
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);
return ;
}
lwc_string_unref(qs.name);
if (bodynode == NULL) {
return;
}
error = node_is_visited(ctx, node, &is_visited);
if (error != CSS_OK)
return;
if (is_visited) {
err = dom_element_get_attribute(bodynode,
corestring_dom_vlink, &color);
} else {
err = dom_element_get_attribute(bodynode,
corestring_dom_link, &color);
}
if (err == DOM_NO_ERR && color != NULL) {
if (nscss_parse_colour(
(const char *)dom_string_data(color),
&hint->data.color)) {
hint->prop = CSS_PROP_COLOR;
hint->status = CSS_COLOR_COLOR;
css_hint_advance(&hint);
}
dom_string_unref(color);
}
}
static void css_hint_body_color(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception err;
dom_string *color;
err = dom_element_get_attribute(node, corestring_dom_text, &color);
if (err == DOM_NO_ERR && color != NULL) {
if (nscss_parse_colour(
(const char *)dom_string_data(color),
&hint->data.color)) {
hint->prop = CSS_PROP_COLOR;
hint->status = CSS_COLOR_COLOR;
css_hint_advance(&hint);
}
dom_string_unref(color);
}
}
static void css_hint_color(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception err;
dom_string *color;
err = dom_element_get_attribute(node, corestring_dom_color, &color);
if (err == DOM_NO_ERR && color != NULL) {
if (nscss_parse_colour(
(const char *)dom_string_data(color),
&hint->data.color)) {
hint->prop = CSS_PROP_COLOR;
hint->status = CSS_COLOR_COLOR;
css_hint_advance(&hint);
}
dom_string_unref(color);
}
}
static void css_hint_font_size(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception err;
dom_string *size;
err = dom_element_get_attribute(node, corestring_dom_size, &size);
if (err == DOM_NO_ERR && size != NULL) {
if (parse_font_size(
(const char *)dom_string_data(size),
&hint->status,
&hint->data.length.value,
&hint->data.length.unit)) {
hint->prop = CSS_PROP_FONT_SIZE;
css_hint_advance(&hint);
}
dom_string_unref(size);
}
}
static void css_hint_float(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception err;
dom_string *align;
err = dom_element_get_attribute(node, corestring_dom_align, &align);
if (err == DOM_NO_ERR && align != NULL) {
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_left)) {
hint->prop = CSS_PROP_FLOAT;
hint->status = CSS_FLOAT_LEFT;
css_hint_advance(&hint);
} else if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_right)) {
hint->prop = CSS_PROP_FLOAT;
hint->status = CSS_FLOAT_RIGHT;
css_hint_advance(&hint);
}
dom_string_unref(align);
}
}
static void css_hint_caption_side(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception err;
dom_string *align = NULL;
err = dom_element_get_attribute(node, corestring_dom_align, &align);
if (err == DOM_NO_ERR && align != NULL) {
if (dom_string_caseless_lwc_isequal(align,
corestring_lwc_bottom)) {
hint->prop = CSS_PROP_CAPTION_SIDE;
hint->status = CSS_CAPTION_SIDE_BOTTOM;
css_hint_advance(&hint);
}
dom_string_unref(align);
}
}
static void css_hint_bg_color(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &hint_ctx.hints[hint_ctx.len];
dom_exception err;
dom_string *bgcolor;
err = dom_element_get_attribute(node,
corestring_dom_bgcolor, &bgcolor);
if (err == DOM_NO_ERR && bgcolor != NULL) {
if (nscss_parse_colour(
(const char *)dom_string_data(bgcolor),
&hint->data.color)) {
hint->prop = CSS_PROP_BACKGROUND_COLOR;
hint->status = CSS_BACKGROUND_COLOR_COLOR;
css_hint_advance(&hint);
}
dom_string_unref(bgcolor);
}
}
static void css_hint_bg_image(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &(hint_ctx.hints[hint_ctx.len]);
dom_exception err;
dom_string *attr;
err = dom_element_get_attribute(node,
corestring_dom_background, &attr);
if (err == DOM_NO_ERR && attr != NULL) {
nsurl *url;
nserror error = nsurl_join(ctx->base_url,
(const char *)dom_string_data(attr), &url);
dom_string_unref(attr);
if (error == NSERROR_OK) {
lwc_string *iurl;
lwc_error lerror = lwc_intern_string(nsurl_access(url),
nsurl_length(url), &iurl);
nsurl_unref(url);
if (lerror == lwc_error_ok) {
hint->prop = CSS_PROP_BACKGROUND_IMAGE;
hint->data.string = iurl;
hint->status = CSS_BACKGROUND_IMAGE_IMAGE;
css_hint_advance(&hint);
}
}
}
}
static void css_hint_white_space_nowrap(
nscss_select_ctx *ctx,
dom_node *node)
{
struct css_hint *hint = &(hint_ctx.hints[hint_ctx.len]);
dom_exception err;
bool nowrap;
err = dom_element_has_attribute(node, corestring_dom_nowrap, &nowrap);
if (err == DOM_NO_ERR && nowrap == true) {
hint->prop = CSS_PROP_WHITE_SPACE;
hint->status = CSS_WHITE_SPACE_NOWRAP;
css_hint_advance(&hint);
}
}
/* Exported function, documeted in css/hints.h */
css_error node_presentational_hint(void *pw, void *node,
uint32_t *nhints, css_hint **hints)
{
dom_exception exc;
dom_html_element_type tag_type;
css_hint_clean();
exc = dom_html_element_get_tag_type(node, &tag_type);
if (exc != DOM_NO_ERR) {
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
}
switch (tag_type) {
case DOM_HTML_ELEMENT_TYPE_TH:
case DOM_HTML_ELEMENT_TYPE_TD:
css_hint_width(pw, node);
css_hint_table_cell_border_padding(pw, node);
css_hint_white_space_nowrap(pw, node);
/* fall through */
case DOM_HTML_ELEMENT_TYPE_TR:
css_hint_height(pw, node);
/* fall through */
case DOM_HTML_ELEMENT_TYPE_THEAD:
case DOM_HTML_ELEMENT_TYPE_TBODY:
case DOM_HTML_ELEMENT_TYPE_TFOOT:
css_hint_text_align_special(pw, node);
/* fall through */
case DOM_HTML_ELEMENT_TYPE_COL:
css_hint_vertical_align_table_cells(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_APPLET:
case DOM_HTML_ELEMENT_TYPE_IMG:
css_hint_margin_hspace_vspace(pw, node);
/* fall through */
case DOM_HTML_ELEMENT_TYPE_EMBED:
case DOM_HTML_ELEMENT_TYPE_IFRAME:
case DOM_HTML_ELEMENT_TYPE_OBJECT:
css_hint_height(pw, node);
css_hint_width(pw, node);
css_hint_vertical_align_replaced(pw, node);
css_hint_float(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_P:
case DOM_HTML_ELEMENT_TYPE_H1:
case DOM_HTML_ELEMENT_TYPE_H2:
case DOM_HTML_ELEMENT_TYPE_H3:
case DOM_HTML_ELEMENT_TYPE_H4:
case DOM_HTML_ELEMENT_TYPE_H5:
case DOM_HTML_ELEMENT_TYPE_H6:
css_hint_text_align_normal(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_CENTER:
css_hint_text_align_center(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_CAPTION:
css_hint_caption_side(pw, node);
/* fall through */
case DOM_HTML_ELEMENT_TYPE_DIV:
css_hint_text_align_special(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_TABLE:
css_hint_text_align_table_special(pw, node);
css_hint_table_spacing_border(pw, node);
css_hint_float(pw, node);
css_hint_margin_left_right_align_center(pw, node);
css_hint_width(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_HR:
css_hint_width(pw, node);
css_hint_margin_left_right_hr(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_TEXTAREA:
css_hint_height_width_textarea(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_INPUT:
css_hint_width_input(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_A:
css_hint_anchor_color(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_FONT:
css_hint_font_size(pw, node);
break;
case DOM_HTML_ELEMENT_TYPE_BODY:
css_hint_body_color(pw, node);
break;
default:
break;
}
if (tag_type != DOM_HTML_ELEMENT_TYPE__UNKNOWN) {
css_hint_color(pw, node);
css_hint_bg_color(pw, node);
css_hint_bg_image(pw, node);
}
#ifdef LOG_STATS
NSLOG(netsurf, INFO, "Properties with hints: %i", hint_ctx.len);
#endif
css_hint_get_hints(hints, nhints);
return CSS_OK;
}
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