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eBookReaderSwitch/source/html/css-apply.c

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#include "mupdf/fitz.h"
#include "html-imp.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
static const char *inherit_list[] = {
"color",
"direction",
"font-family",
"font-style",
"font-variant",
"font-weight",
"letter-spacing",
"line-height",
"list-style-image",
"list-style-position",
"list-style-type",
"orphans",
"quotes",
"text-align",
"text-indent",
"text-transform",
"visibility",
"white-space",
"widows",
"word-spacing",
};
static const char *border_width_kw[] = {
"medium",
"thick",
"thin",
};
static const char *border_style_kw[] = {
"dashed",
"dotted",
"double",
"groove",
"hidden",
"inset",
"none",
"outset",
"ridge",
"solid",
};
static const char *color_kw[] = {
"aqua",
"black",
"blue",
"fuchsia",
"gray",
"green",
"lime",
"maroon",
"navy",
"olive",
"orange",
"purple",
"red",
"silver",
"teal",
"transparent",
"white",
"yellow",
};
static const char *list_style_type_kw[] = {
"armenian",
"circle",
"decimal",
"decimal-leading-zero",
"disc",
"georgian",
"lower-alpha",
"lower-greek",
"lower-latin",
"lower-roman",
"none",
"square",
"upper-alpha",
"upper-greek",
"upper-latin",
"upper-roman",
};
static const char *list_style_position_kw[] = {
"inside",
"outside",
};
static int
keyword_in_list(const char *name, const char **list, int n)
{
int l = 0;
int r = n - 1;
while (l <= r)
{
int m = (l + r) >> 1;
int c = strcmp(name, list[m]);
if (c < 0)
r = m - 1;
else if (c > 0)
l = m + 1;
else
return 1;
}
return 0;
}
static int
is_bold_from_font_weight(const char *weight)
{
return !strcmp(weight, "bold") || !strcmp(weight, "bolder") || atoi(weight) > 400;
}
static int
is_italic_from_font_style(const char *style)
{
return !strcmp(style, "italic") || !strcmp(style, "oblique");
}
/*
* Compute specificity
*/
static int
count_condition_ids(fz_css_condition *cond)
{
int n = 0;
while (cond)
{
if (cond->type == '#')
n ++;
cond = cond->next;
}
return n;
}
static int
count_selector_ids(fz_css_selector *sel)
{
int n = count_condition_ids(sel->cond);
if (sel->left && sel->right)
{
n += count_selector_ids(sel->left);
n += count_selector_ids(sel->right);
}
return n;
}
static int
count_condition_atts(fz_css_condition *cond)
{
int n = 0;
while (cond)
{
if (cond->type != '#' && cond->type != ':')
n ++;
cond = cond->next;
}
return n;
}
static int
count_selector_atts(fz_css_selector *sel)
{
int n = count_condition_atts(sel->cond);
if (sel->left && sel->right)
{
n += count_selector_atts(sel->left);
n += count_selector_atts(sel->right);
}
return n;
}
static int
count_condition_names(fz_css_condition *cond)
{
int n = 0;
while (cond)
{
if (cond->type == ':')
n ++;
cond = cond->next;
}
return n;
}
static int
count_selector_names(fz_css_selector *sel)
{
int n = count_condition_names(sel->cond);
if (sel->left && sel->right)
{
n += count_selector_names(sel->left);
n += count_selector_names(sel->right);
}
else if (sel->name)
{
n ++;
}
return n;
}
#define INLINE_SPECIFICITY 10000
static int
selector_specificity(fz_css_selector *sel, int important)
{
int b = count_selector_ids(sel);
int c = count_selector_atts(sel);
int d = count_selector_names(sel);
return important * 1000 + b * 100 + c * 10 + d;
}
/*
* Selector matching
*/
static int
match_att_exists_condition(fz_xml *node, const char *key)
{
const char *s = fz_xml_att(node, key);
return s != NULL;
}
static int
match_att_is_condition(fz_xml *node, const char *key, const char *val)
{
const char *att = fz_xml_att(node, key);
return att && !strcmp(val, att);
}
static int
match_att_has_condition(fz_xml *node, const char *att, const char *needle)
{
const char *haystack = fz_xml_att(node, att);
const char *ss;
size_t n;
if (haystack) {
/* Try matching whole property first. */
if (!strcmp(haystack, needle))
return 1;
/* Look for matching words. */
n = strlen(needle);
ss = strstr(haystack, needle);
if (ss && (ss[n] == ' ' || ss[n] == 0) && (ss == haystack || ss[-1] == ' '))
return 1;
}
return 0;
}
static int
match_condition(fz_css_condition *cond, fz_xml *node)
{
if (!cond)
return 1;
switch (cond->type) {
default: return 0;
case ':': return 0; /* don't support pseudo-classes */
case '#': if (!match_att_is_condition(node, "id", cond->val)) return 0; break;
case '.': if (!match_att_has_condition(node, "class", cond->val)) return 0; break;
case '[': if (!match_att_exists_condition(node, cond->key)) return 0; break;
case '=': if (!match_att_is_condition(node, cond->key, cond->val)) return 0; break;
case '~': if (!match_att_has_condition(node, cond->key, cond->val)) return 0; break;
case '|': if (!match_att_is_condition(node, cond->key, cond->val)) return 0; break;
}
return match_condition(cond->next, node);
}
static int
match_selector(fz_css_selector *sel, fz_xml *node)
{
if (!node)
return 0;
if (sel->combine)
{
/* descendant */
if (sel->combine == ' ')
{
fz_xml *parent = fz_xml_up(node);
while (parent)
{
if (match_selector(sel->left, parent))
if (match_selector(sel->right, node))
return 1;
parent = fz_xml_up(parent);
}
return 0;
}
/* child */
if (sel->combine == '>')
{
fz_xml *parent = fz_xml_up(node);
if (!parent)
return 0;
if (!match_selector(sel->left, parent))
return 0;
if (!match_selector(sel->right, node))
return 0;
}
/* adjacent */
if (sel->combine == '+')
{
fz_xml *prev = fz_xml_prev(node);
while (prev && !fz_xml_tag(prev))
prev = fz_xml_prev(prev);
if (!prev)
return 0;
if (!fz_xml_tag(prev))
return 0;
if (!match_selector(sel->left, prev))
return 0;
if (!match_selector(sel->right, node))
return 0;
}
}
if (sel->name)
{
if (!fz_xml_is_tag(node, sel->name))
return 0;
}
if (sel->cond)
{
if (!match_condition(sel->cond, node))
return 0;
}
return 1;
}
/*
* Annotating nodes with properties and expanding shorthand forms.
*/
static int
count_values(fz_css_value *value)
{
int n = 0;
while (value)
{
n++;
value = value->next;
}
return n;
}
static void add_property(fz_css_match *match, const char *name, fz_css_value *value, int spec);
static void
add_shorthand_trbl(fz_css_match *match, fz_css_value *value, int spec,
const char *name_t, const char *name_r, const char *name_b, const char *name_l)
{
int n = count_values(value);
if (n == 1)
{
add_property(match, name_t, value, spec);
add_property(match, name_r, value, spec);
add_property(match, name_b, value, spec);
add_property(match, name_l, value, spec);
}
if (n == 2)
{
fz_css_value *a = value;
fz_css_value *b = value->next;
add_property(match, name_t, a, spec);
add_property(match, name_r, b, spec);
add_property(match, name_b, a, spec);
add_property(match, name_l, b, spec);
}
if (n == 3)
{
fz_css_value *a = value;
fz_css_value *b = value->next;
fz_css_value *c = value->next->next;
add_property(match, name_t, a, spec);
add_property(match, name_r, b, spec);
add_property(match, name_b, c, spec);
add_property(match, name_l, b, spec);
}
if (n == 4)
{
fz_css_value *a = value;
fz_css_value *b = value->next;
fz_css_value *c = value->next->next;
fz_css_value *d = value->next->next->next;
add_property(match, name_t, a, spec);
add_property(match, name_r, b, spec);
add_property(match, name_b, c, spec);
add_property(match, name_l, d, spec);
}
}
static void
add_shorthand_margin(fz_css_match *match, fz_css_value *value, int spec)
{
add_shorthand_trbl(match, value, spec,
"margin-top", "margin-right", "margin-bottom", "margin-left");
}
static void
add_shorthand_padding(fz_css_match *match, fz_css_value *value, int spec)
{
add_shorthand_trbl(match, value, spec,
"padding-top", "padding-right", "padding-bottom", "padding-left");
}
static void
add_shorthand_border_width(fz_css_match *match, fz_css_value *value, int spec)
{
add_shorthand_trbl(match, value, spec,
"border-top-width", "border-right-width", "border-bottom-width", "border-left-width");
}
static void
add_shorthand_border_color(fz_css_match *match, fz_css_value *value, int spec)
{
add_shorthand_trbl(match, value, spec,
"border-top-color", "border-right-color", "border-bottom-color", "border-left-color");
}
static void
add_shorthand_border_style(fz_css_match *match, fz_css_value *value, int spec)
{
add_shorthand_trbl(match, value, spec,
"border-top-style", "border-right-style", "border-bottom-style", "border-left-style");
}
static void
add_shorthand_border(fz_css_match *match, fz_css_value *value, int spec, int T, int R, int B, int L)
{
while (value)
{
if (value->type == CSS_HASH)
{
if (T) add_property(match, "border-top-color", value, spec);
if (R) add_property(match, "border-right-color", value, spec);
if (B) add_property(match, "border-bottom-color", value, spec);
if (L) add_property(match, "border-left-color", value, spec);
}
else if (value->type == CSS_KEYWORD)
{
if (keyword_in_list(value->data, border_width_kw, nelem(border_width_kw)))
{
if (T) add_property(match, "border-top-width", value, spec);
if (R) add_property(match, "border-right-width", value, spec);
if (B) add_property(match, "border-bottom-width", value, spec);
if (L) add_property(match, "border-left-width", value, spec);
}
else if (keyword_in_list(value->data, border_style_kw, nelem(border_style_kw)))
{
if (T) add_property(match, "border-top-style", value, spec);
if (R) add_property(match, "border-right-style", value, spec);
if (B) add_property(match, "border-bottom-style", value, spec);
if (L) add_property(match, "border-left-style", value, spec);
}
else if (keyword_in_list(value->data, color_kw, nelem(color_kw)))
{
if (T) add_property(match, "border-top-color", value, spec);
if (R) add_property(match, "border-right-color", value, spec);
if (B) add_property(match, "border-bottom-color", value, spec);
if (L) add_property(match, "border-left-color", value, spec);
}
}
else
{
if (T) add_property(match, "border-top-width", value, spec);
if (R) add_property(match, "border-right-width", value, spec);
if (B) add_property(match, "border-bottom-width", value, spec);
if (L) add_property(match, "border-left-width", value, spec);
}
value = value->next;
}
}
static void
add_shorthand_list_style(fz_css_match *match, fz_css_value *value, int spec)
{
while (value)
{
if (value->type == CSS_KEYWORD)
{
if (keyword_in_list(value->data, list_style_type_kw, nelem(list_style_type_kw)))
{
add_property(match, "list-style-type", value, spec);
}
else if (keyword_in_list(value->data, list_style_position_kw, nelem(list_style_position_kw)))
{
add_property(match, "list-style-position", value, spec);
}
}
value = value->next;
}
}
static void
add_property(fz_css_match *match, const char *name, fz_css_value *value, int spec)
{
int i;
if (!strcmp(name, "margin"))
{
add_shorthand_margin(match, value, spec);
return;
}
if (!strcmp(name, "padding"))
{
add_shorthand_padding(match, value, spec);
return;
}
if (!strcmp(name, "border-width"))
{
add_shorthand_border_width(match, value, spec);
return;
}
if (!strcmp(name, "border-color"))
{
add_shorthand_border_color(match, value, spec);
return;
}
if (!strcmp(name, "border-style"))
{
add_shorthand_border_style(match, value, spec);
return;
}
if (!strcmp(name, "border"))
{
add_shorthand_border(match, value, spec, 1, 1, 1, 1);
return;
}
if (!strcmp(name, "border-top"))
{
add_shorthand_border(match, value, spec, 1, 0, 0, 0);
return;
}
if (!strcmp(name, "border-right"))
{
add_shorthand_border(match, value, spec, 0, 1, 0, 0);
return;
}
if (!strcmp(name, "border-bottom"))
{
add_shorthand_border(match, value, spec, 0, 0, 1, 0);
return;
}
if (!strcmp(name, "border-left"))
{
add_shorthand_border(match, value, spec, 0, 0, 0, 1);
return;
}
if (!strcmp(name, "list-style"))
{
add_shorthand_list_style(match, value, spec);
return;
}
/* shorthand expansions: */
/* TODO: border-color */
/* TODO: border-style */
/* TODO: font */
/* TODO: list-style */
/* TODO: background */
for (i = 0; i < match->count; ++i)
{
if (!strcmp(match->prop[i].name, name))
{
if (match->prop[i].spec <= spec)
{
match->prop[i].value = value;
match->prop[i].spec = spec;
}
return;
}
}
if (match->count + 1 >= (int)nelem(match->prop))
{
// fz_warn(ctx, "too many css properties");
return;
}
match->prop[match->count].name = name;
match->prop[match->count].value = value;
match->prop[match->count].spec = spec;
++match->count;
}
static void
sort_properties(fz_css_match *match)
{
int count = match->count;
fz_css_match_prop *prop = match->prop;
int i, k;
/* Insertion sort. */
for (i = 1; i < count; ++i)
{
k = i;
while (k > 0 && strcmp(prop[k-1].name, prop[k].name) > 0)
{
fz_css_match_prop save = prop[k-1];
prop[k-1] = prop[k];
prop[k] = save;
--k;
}
}
}
void
fz_match_css(fz_context *ctx, fz_css_match *match, fz_css *css, fz_xml *node)
{
fz_css_rule *rule;
fz_css_selector *sel;
fz_css_property *prop;
const char *s;
for (rule = css->rule; rule; rule = rule->next)
{
sel = rule->selector;
while (sel)
{
if (match_selector(sel, node))
{
for (prop = rule->declaration; prop; prop = prop->next)
add_property(match, prop->name, prop->value, selector_specificity(sel, prop->important));
break;
}
sel = sel->next;
}
}
if (fz_use_document_css(ctx))
{
s = fz_xml_att(node, "style");
if (s)
{
fz_try(ctx)
{
prop = fz_parse_css_properties(ctx, css->pool, s);
while (prop)
{
add_property(match, prop->name, prop->value, INLINE_SPECIFICITY);
prop = prop->next;
}
/* We can "leak" the property here, since it is freed along with the pool allocator. */
}
fz_catch(ctx)
{
fz_warn(ctx, "ignoring style attribute");
}
}
}
sort_properties(match); /* speed up subsequent value_from_raw_property lookups */
}
void
fz_match_css_at_page(fz_context *ctx, fz_css_match *match, fz_css *css)
{
fz_css_rule *rule;
fz_css_selector *sel;
fz_css_property *prop;
for (rule = css->rule; rule; rule = rule->next)
{
sel = rule->selector;
while (sel)
{
if (sel->name && !strcmp(sel->name, "@page"))
{
for (prop = rule->declaration; prop; prop = prop->next)
add_property(match, prop->name, prop->value, selector_specificity(sel, prop->important));
break;
}
sel = sel->next;
}
}
sort_properties(match); /* speed up subsequent value_from_raw_property lookups */
}
void
fz_add_css_font_face(fz_context *ctx, fz_html_font_set *set, fz_archive *zip, const char *base_uri, fz_css_property *declaration)
{
fz_html_font_face *custom;
fz_css_property *prop;
fz_font *font = NULL;
fz_buffer *buf = NULL;
int is_bold, is_italic, is_small_caps;
char path[2048];
const char *family = "serif";
const char *weight = "normal";
const char *style = "normal";
const char *variant = "normal";
const char *src = NULL;
for (prop = declaration; prop; prop = prop->next)
{
if (!strcmp(prop->name, "font-family")) family = prop->value->data;
if (!strcmp(prop->name, "font-weight")) weight = prop->value->data;
if (!strcmp(prop->name, "font-style")) style = prop->value->data;
if (!strcmp(prop->name, "font-variant")) variant = prop->value->data;
if (!strcmp(prop->name, "src")) src = prop->value->data;
}
if (!src)
return;
is_bold = is_bold_from_font_weight(weight);
is_italic = is_italic_from_font_style(style);
is_small_caps = !strcmp(variant, "small-caps");
fz_strlcpy(path, base_uri, sizeof path);
fz_strlcat(path, "/", sizeof path);
fz_strlcat(path, src, sizeof path);
fz_urldecode(path);
fz_cleanname(path);
for (custom = set->custom; custom; custom = custom->next)
if (!strcmp(custom->src, path) && !strcmp(custom->family, family) &&
custom->is_bold == is_bold &&
custom->is_italic == is_italic &&
custom->is_small_caps == is_small_caps)
return; /* already loaded */
fz_var(buf);
fz_var(font);
fz_try(ctx)
{
if (fz_has_archive_entry(ctx, zip, path))
buf = fz_read_archive_entry(ctx, zip, path);
else
buf = fz_read_file(ctx, src);
font = fz_new_font_from_buffer(ctx, NULL, buf, 0, 0);
fz_add_html_font_face(ctx, set, family, is_bold, is_italic, is_small_caps, path, font);
}
fz_always(ctx)
{
fz_drop_buffer(ctx, buf);
fz_drop_font(ctx, font);
}
fz_catch(ctx)
{
fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
fz_warn(ctx, "cannot load font-face: %s", src);
}
}
void
fz_add_css_font_faces(fz_context *ctx, fz_html_font_set *set, fz_archive *zip, const char *base_uri, fz_css *css)
{
fz_css_rule *rule;
fz_css_selector *sel;
for (rule = css->rule; rule; rule = rule->next)
{
if (!rule->loaded)
{
rule->loaded = 1;
sel = rule->selector;
while (sel)
{
if (sel->name && !strcmp(sel->name, "@font-face"))
{
fz_add_css_font_face(ctx, set, zip, base_uri, rule->declaration);
break;
}
sel = sel->next;
}
}
}
}
static fz_css_value *
value_from_raw_property(fz_css_match *match, const char *name)
{
fz_css_match_prop *prop = match->prop;
int l = 0;
int r = match->count - 1;
while (l <= r)
{
int m = (l + r) >> 1;
int c = strcmp(name, prop[m].name);
if (c < 0)
r = m - 1;
else if (c > 0)
l = m + 1;
else
return prop[m].value;
}
return NULL;
}
static fz_css_value *
value_from_property(fz_css_match *match, const char *name)
{
fz_css_value *value;
value = value_from_raw_property(match, name);
if (match->up)
{
if (value && !strcmp(value->data, "inherit"))
if (strcmp(name, "font-size") != 0) /* never inherit 'font-size' textually */
return value_from_property(match->up, name);
if (!value && keyword_in_list(name, inherit_list, nelem(inherit_list)))
return value_from_property(match->up, name);
}
return value;
}
static const char *
string_from_property(fz_css_match *match, const char *name, const char *initial)
{
fz_css_value *value;
value = value_from_property(match, name);
if (!value)
return initial;
return value->data;
}
static fz_css_number
make_number(float v, int u)
{
fz_css_number n;
n.value = v;
n.unit = u;
return n;
}
/* Fast but inaccurate strtof. */
static float
fz_css_strtof(char *s, char **endptr)
{
float sign = 1;
float v = 0;
float n = 0;
float d = 1;
if (*s == '-')
{
sign = -1;
++s;
}
while (*s >= '0' && *s <= '9')
{
v = v * 10 + (*s - '0');
++s;
}
if (*s == '.')
{
++s;
while (*s >= '0' && *s <= '9')
{
n = n * 10 + (*s - '0');
d = d * 10;
++s;
}
v += n / d;
}
if (endptr)
*endptr = s;
return sign * v;
}
static fz_css_number
number_from_value(fz_css_value *value, float initial, int initial_unit)
{
char *p;
if (!value)
return make_number(initial, initial_unit);
if (value->type == CSS_PERCENT)
return make_number(fz_css_strtof(value->data, NULL), N_PERCENT);
if (value->type == CSS_NUMBER)
return make_number(fz_css_strtof(value->data, NULL), N_NUMBER);
if (value->type == CSS_LENGTH)
{
float x = fz_css_strtof(value->data, &p);
if (p[0] == 'e' && p[1] == 'm' && p[2] == 0)
return make_number(x, N_SCALE);
if (p[0] == 'e' && p[1] == 'x' && p[2] == 0)
return make_number(x / 2, N_SCALE);
if (p[0] == 'i' && p[1] == 'n' && p[2] == 0)
return make_number(x * 72, N_LENGTH);
if (p[0] == 'c' && p[1] == 'm' && p[2] == 0)
return make_number(x * 7200 / 254, N_LENGTH);
if (p[0] == 'm' && p[1] == 'm' && p[2] == 0)
return make_number(x * 720 / 254, N_LENGTH);
if (p[0] == 'p' && p[1] == 'c' && p[2] == 0)
return make_number(x * 12, N_LENGTH);
if (p[0] == 'p' && p[1] == 't' && p[2] == 0)
return make_number(x, N_LENGTH);
if (p[0] == 'p' && p[1] == 'x' && p[2] == 0)
return make_number(x, N_LENGTH);
/* FIXME: 'rem' should be 'em' of root element. This is a bad approximation. */
if (p[0] == 'r' && p[1] == 'e' && p[2] == 'm' && p[3] == 0)
return make_number(x * 16, N_LENGTH);
/* FIXME: 'ch' should be width of '0' character. This is an approximation. */
if (p[0] == 'c' && p[1] == 'h' && p[2] == 0)
return make_number(x / 2, N_LENGTH);
return make_number(x, N_LENGTH);
}
if (value->type == CSS_KEYWORD)
{
if (!strcmp(value->data, "auto"))
return make_number(0, N_AUTO);
}
return make_number(initial, initial_unit);
}
static fz_css_number
number_from_property(fz_css_match *match, const char *property, float initial, int initial_unit)
{
return number_from_value(value_from_property(match, property), initial, initial_unit);
}
static fz_css_number
border_width_from_property(fz_css_match *match, const char *property)
{
fz_css_value *value = value_from_property(match, property);
if (value)
{
if (!strcmp(value->data, "thin"))
return make_number(1, N_LENGTH);
if (!strcmp(value->data, "medium"))
return make_number(2, N_LENGTH);
if (!strcmp(value->data, "thick"))
return make_number(4, N_LENGTH);
return number_from_value(value, 0, N_LENGTH);
}
return make_number(2, N_LENGTH); /* initial: 'medium' */
}
static int
border_style_from_property(fz_css_match *match, const char *property)
{
fz_css_value *value = value_from_property(match, property);
if (value)
{
if (!strcmp(value->data, "none")) return BS_NONE;
else if (!strcmp(value->data, "hidden")) return BS_NONE;
else if (!strcmp(value->data, "solid")) return BS_SOLID;
}
return BS_NONE;
}
float
fz_from_css_number(fz_css_number number, float em, float percent_value, float auto_value)
{
switch (number.unit) {
default:
case N_NUMBER: return number.value;
case N_LENGTH: return number.value;
case N_SCALE: return number.value * em;
case N_PERCENT: return number.value * 0.01f * percent_value;
case N_AUTO: return auto_value;
}
}
float
fz_from_css_number_scale(fz_css_number number, float scale)
{
switch (number.unit) {
default:
case N_NUMBER: return number.value * scale;
case N_LENGTH: return number.value;
case N_SCALE: return number.value * scale;
case N_PERCENT: return number.value * 0.01f * scale;
case N_AUTO: return scale;
}
}
static fz_css_color
make_color(int r, int g, int b, int a)
{
fz_css_color c;
c.r = r < 0 ? 0 : r > 255 ? 255 : r;
c.g = g < 0 ? 0 : g > 255 ? 255 : g;
c.b = b < 0 ? 0 : b > 255 ? 255 : b;
c.a = a < 0 ? 0 : a > 255 ? 255 : a;
return c;
}
static int tohex(int c)
{
if (c - '0' < 10)
return c - '0';
return (c | 32) - 'a' + 10;
}
static fz_css_color
color_from_value(fz_css_value *value, fz_css_color initial)
{
if (!value)
return initial;
if (value->type == CSS_HASH)
{
int r, g, b;
size_t n;
hex_color:
n = strlen(value->data);
if (n == 3)
{
r = tohex(value->data[0]) * 16 + tohex(value->data[0]);
g = tohex(value->data[1]) * 16 + tohex(value->data[1]);
b = tohex(value->data[2]) * 16 + tohex(value->data[2]);
}
else if (n == 6)
{
r = tohex(value->data[0]) * 16 + tohex(value->data[1]);
g = tohex(value->data[2]) * 16 + tohex(value->data[3]);
b = tohex(value->data[4]) * 16 + tohex(value->data[5]);
}
else
{
r = g = b = 0;
}
return make_color(r, g, b, 255);
}
if (value->type == '(' && !strcmp(value->data, "rgb"))
{
fz_css_value *vr, *vg, *vb;
int r, g, b;
vr = value->args;
vg = vr && vr->next ? vr->next->next : NULL; /* skip the ',' nodes */
vb = vg && vg->next ? vg->next->next : NULL; /* skip the ',' nodes */
r = fz_from_css_number(number_from_value(vr, 0, N_NUMBER), 255, 255, 0);
g = fz_from_css_number(number_from_value(vg, 0, N_NUMBER), 255, 255, 0);
b = fz_from_css_number(number_from_value(vb, 0, N_NUMBER), 255, 255, 0);
return make_color(r, g, b, 255);
}
if (value->type == CSS_KEYWORD)
{
if (!strcmp(value->data, "transparent"))
return make_color(0, 0, 0, 0);
if (!strcmp(value->data, "maroon"))
return make_color(0x80, 0x00, 0x00, 255);
if (!strcmp(value->data, "red"))
return make_color(0xFF, 0x00, 0x00, 255);
if (!strcmp(value->data, "orange"))
return make_color(0xFF, 0xA5, 0x00, 255);
if (!strcmp(value->data, "yellow"))
return make_color(0xFF, 0xFF, 0x00, 255);
if (!strcmp(value->data, "olive"))
return make_color(0x80, 0x80, 0x00, 255);
if (!strcmp(value->data, "purple"))
return make_color(0x80, 0x00, 0x80, 255);
if (!strcmp(value->data, "fuchsia"))
return make_color(0xFF, 0x00, 0xFF, 255);
if (!strcmp(value->data, "white"))
return make_color(0xFF, 0xFF, 0xFF, 255);
if (!strcmp(value->data, "lime"))
return make_color(0x00, 0xFF, 0x00, 255);
if (!strcmp(value->data, "green"))
return make_color(0x00, 0x80, 0x00, 255);
if (!strcmp(value->data, "navy"))
return make_color(0x00, 0x00, 0x80, 255);
if (!strcmp(value->data, "blue"))
return make_color(0x00, 0x00, 0xFF, 255);
if (!strcmp(value->data, "aqua"))
return make_color(0x00, 0xFF, 0xFF, 255);
if (!strcmp(value->data, "teal"))
return make_color(0x00, 0x80, 0x80, 255);
if (!strcmp(value->data, "black"))
return make_color(0x00, 0x00, 0x00, 255);
if (!strcmp(value->data, "silver"))
return make_color(0xC0, 0xC0, 0xC0, 255);
if (!strcmp(value->data, "gray"))
return make_color(0x80, 0x80, 0x80, 255);
goto hex_color; /* last ditch attempt: maybe it's a #XXXXXX color without the # */
}
return initial;
}
static fz_css_color
color_from_property(fz_css_match *match, const char *property, fz_css_color initial)
{
return color_from_value(value_from_property(match, property), initial);
}
int
fz_get_css_match_display(fz_css_match *match)
{
fz_css_value *value = value_from_property(match, "display");
if (value)
{
if (!strcmp(value->data, "none"))
return DIS_NONE;
if (!strcmp(value->data, "inline"))
return DIS_INLINE;
if (!strcmp(value->data, "block"))
return DIS_BLOCK;
if (!strcmp(value->data, "list-item"))
return DIS_LIST_ITEM;
if (!strcmp(value->data, "inline-block"))
return DIS_INLINE_BLOCK;
if (!strcmp(value->data, "table"))
return DIS_TABLE;
if (!strcmp(value->data, "table-row"))
return DIS_TABLE_ROW;
if (!strcmp(value->data, "table-cell"))
return DIS_TABLE_CELL;
}
return DIS_INLINE;
}
static int
white_space_from_property(fz_css_match *match)
{
fz_css_value *value = value_from_property(match, "white-space");
if (value)
{
if (!strcmp(value->data, "normal")) return WS_NORMAL;
else if (!strcmp(value->data, "pre")) return WS_PRE;
else if (!strcmp(value->data, "nowrap")) return WS_NOWRAP;
else if (!strcmp(value->data, "pre-wrap")) return WS_PRE_WRAP;
else if (!strcmp(value->data, "pre-line")) return WS_PRE_LINE;
}
return WS_NORMAL;
}
static int
visibility_from_property(fz_css_match *match)
{
fz_css_value *value = value_from_property(match, "visibility");
if (value)
{
if (!strcmp(value->data, "visible")) return V_VISIBLE;
else if (!strcmp(value->data, "hidden")) return V_HIDDEN;
else if (!strcmp(value->data, "collapse")) return V_COLLAPSE;
}
return V_VISIBLE;
}
static int
page_break_from_property(fz_css_match *match, char *prop)
{
fz_css_value *value = value_from_property(match, prop);
if (value)
{
if (!strcmp(value->data, "auto")) return PB_AUTO;
else if (!strcmp(value->data, "always")) return PB_ALWAYS;
else if (!strcmp(value->data, "avoid")) return PB_AVOID;
else if (!strcmp(value->data, "left")) return PB_LEFT;
else if (!strcmp(value->data, "right")) return PB_RIGHT;
}
return PB_AUTO;
}
void
fz_default_css_style(fz_context *ctx, fz_css_style *style)
{
memset(style, 0, sizeof *style);
style->visibility = V_VISIBLE;
style->text_align = TA_LEFT;
style->vertical_align = VA_BASELINE;
style->white_space = WS_NORMAL;
style->list_style_type = LST_DISC;
style->font_size = make_number(1, N_SCALE);
style->width = make_number(0, N_AUTO);
style->height = make_number(0, N_AUTO);
}
void
fz_apply_css_style(fz_context *ctx, fz_html_font_set *set, fz_css_style *style, fz_css_match *match)
{
fz_css_value *value;
fz_css_color black = { 0, 0, 0, 255 };
fz_css_color transparent = { 0, 0, 0, 0 };
fz_default_css_style(ctx, style);
style->visibility = visibility_from_property(match);
style->white_space = white_space_from_property(match);
style->page_break_before = page_break_from_property(match, "page-break-before");
style->page_break_after = page_break_from_property(match, "page-break-after");
value = value_from_property(match, "text-align");
if (value)
{
if (!strcmp(value->data, "left")) style->text_align = TA_LEFT;
else if (!strcmp(value->data, "right")) style->text_align = TA_RIGHT;
else if (!strcmp(value->data, "center")) style->text_align = TA_CENTER;
else if (!strcmp(value->data, "justify")) style->text_align = TA_JUSTIFY;
}
value = value_from_property(match, "vertical-align");
if (value)
{
if (!strcmp(value->data, "baseline")) style->vertical_align = VA_BASELINE;
else if (!strcmp(value->data, "sub")) style->vertical_align = VA_SUB;
else if (!strcmp(value->data, "super")) style->vertical_align = VA_SUPER;
else if (!strcmp(value->data, "top")) style->vertical_align = VA_TOP;
else if (!strcmp(value->data, "bottom")) style->vertical_align = VA_BOTTOM;
else if (!strcmp(value->data, "text-top")) style->vertical_align = VA_TEXT_TOP;
else if (!strcmp(value->data, "text-bottom")) style->vertical_align = VA_TEXT_BOTTOM;
}
value = value_from_property(match, "font-size");
if (value)
{
if (!strcmp(value->data, "xx-large")) style->font_size = make_number(1.73f, N_SCALE);
else if (!strcmp(value->data, "x-large")) style->font_size = make_number(1.44f, N_SCALE);
else if (!strcmp(value->data, "large")) style->font_size = make_number(1.2f, N_SCALE);
else if (!strcmp(value->data, "medium")) style->font_size = make_number(1.0f, N_SCALE);
else if (!strcmp(value->data, "small")) style->font_size = make_number(0.83f, N_SCALE);
else if (!strcmp(value->data, "x-small")) style->font_size = make_number(0.69f, N_SCALE);
else if (!strcmp(value->data, "xx-small")) style->font_size = make_number(0.69f, N_SCALE);
else if (!strcmp(value->data, "larger")) style->font_size = make_number(1.2f, N_SCALE);
else if (!strcmp(value->data, "smaller")) style->font_size = make_number(1/1.2f, N_SCALE);
else style->font_size = number_from_value(value, 12, N_LENGTH);
}
else
{
style->font_size = make_number(1, N_SCALE);
}
value = value_from_property(match, "list-style-type");
if (value)
{
if (!strcmp(value->data, "none")) style->list_style_type = LST_NONE;
else if (!strcmp(value->data, "disc")) style->list_style_type = LST_DISC;
else if (!strcmp(value->data, "circle")) style->list_style_type = LST_CIRCLE;
else if (!strcmp(value->data, "square")) style->list_style_type = LST_SQUARE;
else if (!strcmp(value->data, "decimal")) style->list_style_type = LST_DECIMAL;
else if (!strcmp(value->data, "decimal-leading-zero")) style->list_style_type = LST_DECIMAL_ZERO;
else if (!strcmp(value->data, "lower-roman")) style->list_style_type = LST_LC_ROMAN;
else if (!strcmp(value->data, "upper-roman")) style->list_style_type = LST_UC_ROMAN;
else if (!strcmp(value->data, "lower-greek")) style->list_style_type = LST_LC_GREEK;
else if (!strcmp(value->data, "upper-greek")) style->list_style_type = LST_UC_GREEK;
else if (!strcmp(value->data, "lower-latin")) style->list_style_type = LST_LC_LATIN;
else if (!strcmp(value->data, "upper-latin")) style->list_style_type = LST_UC_LATIN;
else if (!strcmp(value->data, "lower-alpha")) style->list_style_type = LST_LC_ALPHA;
else if (!strcmp(value->data, "upper-alpha")) style->list_style_type = LST_UC_ALPHA;
else if (!strcmp(value->data, "armenian")) style->list_style_type = LST_ARMENIAN;
else if (!strcmp(value->data, "georgian")) style->list_style_type = LST_GEORGIAN;
}
style->line_height = number_from_property(match, "line-height", 1.2f, N_SCALE);
style->text_indent = number_from_property(match, "text-indent", 0, N_LENGTH);
style->width = number_from_property(match, "width", 0, N_AUTO);
style->height = number_from_property(match, "height", 0, N_AUTO);
style->margin[0] = number_from_property(match, "margin-top", 0, N_LENGTH);
style->margin[1] = number_from_property(match, "margin-right", 0, N_LENGTH);
style->margin[2] = number_from_property(match, "margin-bottom", 0, N_LENGTH);
style->margin[3] = number_from_property(match, "margin-left", 0, N_LENGTH);
style->padding[0] = number_from_property(match, "padding-top", 0, N_LENGTH);
style->padding[1] = number_from_property(match, "padding-right", 0, N_LENGTH);
style->padding[2] = number_from_property(match, "padding-bottom", 0, N_LENGTH);
style->padding[3] = number_from_property(match, "padding-left", 0, N_LENGTH);
style->color = color_from_property(match, "color", black);
style->background_color = color_from_property(match, "background-color", transparent);
style->border_style_0 = border_style_from_property(match, "border-top-style");
style->border_style_1 = border_style_from_property(match, "border-right-style");
style->border_style_2 = border_style_from_property(match, "border-bottom-style");
style->border_style_3 = border_style_from_property(match, "border-left-style");
style->border_color[0] = color_from_property(match, "border-top-color", style->color);
style->border_color[1] = color_from_property(match, "border-right-color", style->color);
style->border_color[2] = color_from_property(match, "border-bottom-color", style->color);
style->border_color[3] = color_from_property(match, "border-left-color", style->color);
style->border_width[0] = border_width_from_property(match, "border-top-width");
style->border_width[1] = border_width_from_property(match, "border-right-width");
style->border_width[2] = border_width_from_property(match, "border-bottom-width");
style->border_width[3] = border_width_from_property(match, "border-left-width");
{
const char *font_weight = string_from_property(match, "font-weight", "normal");
const char *font_style = string_from_property(match, "font-style", "normal");
const char *font_variant = string_from_property(match, "font-variant", "normal");
int is_bold = is_bold_from_font_weight(font_weight);
int is_italic = is_italic_from_font_style(font_style);
style->small_caps = !strcmp(font_variant, "small-caps");
value = value_from_property(match, "font-family");
while (value)
{
if (strcmp(value->data, ",") != 0)
{
style->font = fz_load_html_font(ctx, set, value->data, is_bold, is_italic, style->small_caps);
if (style->font)
break;
}
value = value->next;
}
if (!style->font)
style->font = fz_load_html_font(ctx, set, "serif", is_bold, is_italic, style->small_caps);
}
}
#ifdef DEBUG_CSS_SPLAY
static void
do_verify_splay(const fz_css_style_splay *x)
{
printf("%x<", x);
if (x->lt)
{
assert(memcmp(&x->lt->style, &x->style, sizeof(x->style)) < 0);
assert(x->lt->up == x);
do_verify_splay(x->lt);
}
printf(",");
if (x->gt)
{
assert(memcmp(&x->gt->style, &x->style, sizeof(x->style)) > 0);
assert(x->gt->up == x);
do_verify_splay(x->gt);
}
printf(">\n");
}
static void
verify_splay(const fz_css_style_splay *x)
{
if (x == NULL)
return;
assert(x->up == NULL);
do_verify_splay(x);
printf("-----\n");
}
#endif
/* Lookup style in the splay tree, returning a pointer to the found instance
* if there is one, creating and inserting (and moving to root) one if there
* is not. */
const fz_css_style *
fz_css_enlist(fz_context *ctx, const fz_css_style *style, fz_css_style_splay **tree, fz_pool *pool)
{
fz_css_style_splay **current = tree;
fz_css_style_splay *x;
fz_css_style_splay *y = NULL;
/* Search for a match in the tree, if there is one, or for
* the insertion point, if there is not. */
while (*current != NULL)
{
int cmp = memcmp(style, &(*current)->style, sizeof(*style));
if (cmp == 0)
{
/* We have a match - break out and do move to root. */
break;
}
y = (*current);
if (cmp < 0)
current = &y->lt;
else
current = &y->gt;
}
/* Create one if needed */
if (*current == NULL)
{
x = *current = fz_pool_alloc(ctx, pool, sizeof(*y));
x->style = *style;
x->up = y;
x->lt = NULL;
x->gt = NULL;
}
else
x = *current;
/* Now move to root */
/*
The splaying steps used:
Case 1: |a) z x b) z x
| y D => A y A y y D
| x C B z B x => z C
| A B C D C D A B
Case 2: |a) z x b) z x
| y D => y z A y => z y
| A x A B C D x D A B C D
| B C B C
Case 3: |a) y x b) y x
| x C => A y A x => y C
| A B B C B C A B
*/
#ifdef DEBUG_CSS_SPLAY
printf("BEFORE\n");
verify_splay(*tree);
#endif
while ((y = x->up) != NULL ) /* While we're not at the root */
{
fz_css_style_splay *z = y->up;
y->up = x;
if (z == NULL)
{
if (y->lt == x) /* Case 3a */
{
y->lt = x->gt;
if (y->lt)
y->lt->up = y;
x->gt = y;
}
else /* Case 3b */
{
y->gt = x->lt;
if (y->gt)
y->gt->up = y;
x->lt = y;
}
x->up = NULL;
break;
}
x->up = z->up;
if (z->up)
{
if (z->up->lt == z)
z->up->lt = x;
else
z->up->gt = x;
}
if (z->lt == y)
{
if (y->lt == x) /* Case 1a */
{
z->lt = y->gt;
if (z->lt)
z->lt->up = z;
y->lt = x->gt;
if (y->lt)
y->lt->up = y;
y->gt = z;
z->up = y;
x->gt = y;
}
else /* Case 2a */
{
y->gt = x->lt;
if (y->gt)
y->gt->up = y;
z->lt = x->gt;
if (z->lt)
z->lt->up = z;
x->lt = y;
x->gt = z;
z->up = x;
}
}
else
{
if (y->gt == x) /* Case 1b */
{
z->gt = y->lt;
if (z->gt)
z->gt->up = z;
y->gt = x->lt;
if (y->gt)
y->gt->up = y;
y->lt = z;
z->up = y;
x->lt = y;
}
else /* Case 2b */
{
z->gt = x->lt;
if (z->gt)
z->gt->up = z;
y->lt = x->gt;
if (y->lt)
y->lt->up = y;
x->gt = y;
x->lt = z;
z->up = x;
}
}
}
*tree = x;
#ifdef DEBUG_CSS_SPLAY
printf("AFTER\n");
verify_splay(x);
#endif
return &x->style;
}
/*
* Pretty printing
*/
static void print_value(fz_css_value *val)
{
printf("%s", val->data);
if (val->args)
{
printf("(");
print_value(val->args);
printf(")");
}
if (val->next)
{
printf(" ");
print_value(val->next);
}
}
static void print_property(fz_css_property *prop)
{
printf("\t%s: ", prop->name);
print_value(prop->value);
if (prop->important)
printf(" !important");
printf(";\n");
}
static void print_condition(fz_css_condition *cond)
{
if (cond->type == '=')
printf("[%s=%s]", cond->key, cond->val);
else if (cond->type == '[')
printf("[%s]", cond->key);
else
printf("%c%s", cond->type, cond->val);
if (cond->next)
print_condition(cond->next);
}
static void print_selector(fz_css_selector *sel)
{
if (sel->combine)
{
print_selector(sel->left);
if (sel->combine == ' ')
printf(" ");
else
printf(" %c ", sel->combine);
print_selector(sel->right);
}
else if (sel->name)
printf("%s", sel->name);
else
printf("*");
if (sel->cond)
{
print_condition(sel->cond);
}
}
static void print_rule(fz_css_rule *rule)
{
fz_css_selector *sel;
fz_css_property *prop;
for (sel = rule->selector; sel; sel = sel->next)
{
print_selector(sel);
printf(" /* %d */", selector_specificity(sel, 0));
if (sel->next)
printf(", ");
}
printf("\n{\n");
for (prop = rule->declaration; prop; prop = prop->next)
{
print_property(prop);
}
printf("}\n");
}
void
fz_debug_css(fz_context *ctx, fz_css *css)
{
fz_css_rule *rule = css->rule;
while (rule)
{
print_rule(rule);
rule = rule->next;
}
}
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